from fastapi import FastAPI, Depends, HTTPException, Query, Request, UploadFile, File
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import RedirectResponse, HTMLResponse
from fastapi.staticfiles import StaticFiles
from sqlalchemy.orm import Session
from sqlalchemy import or_
import uvicorn
from typing import List, Optional
from uuid import UUID, uuid4
import os
import io
import csv
import json
import secrets
import logging
import shutil
from pathlib import Path
from dotenv import load_dotenv
import httpx
import ssl
import certifi
from urllib.parse import urlencode, quote
from datetime import timezone, timedelta

logger = logging.getLogger(__name__)

import models
import schemas
import crud
import authz
import google_contacts
from database import engine, get_db
from whatsapp import get_whatsapp_service, WhatsAppError
from whatsapp_templates import list_templates_for_frontend, add_custom_template, delete_custom_template

# Load environment variables
load_dotenv()

# Create database tables
models.Base.metadata.create_all(bind=engine)

# ── Auto-migrate: add new columns if they don't exist yet ────────────────────
def _run_startup_migrations():
    """Idempotent column additions — safe to run on every deploy."""
    statements = [
        "ALTER TABLE events ADD COLUMN IF NOT EXISTS invitation_image_url TEXT;",
        "ALTER TABLE events ADD COLUMN IF NOT EXISTS guest_form_fields TEXT;",
        "ALTER TABLE guests_v2 ADD COLUMN IF NOT EXISTS companion_count INTEGER DEFAULT 0;",
    ]
    from sqlalchemy import text
    with engine.connect() as conn:
        for stmt in statements:
            try:
                conn.execute(text(stmt))
            except Exception as e:
                print(f"[startup migration] warning: {e}")
        conn.commit()

_run_startup_migrations()

app = FastAPI(title="Multi-Event Invitation Management API")

# Ensure uploads directory exists and serve it as static files
UPLOADS_DIR = Path(__file__).parent / "uploads"
UPLOADS_DIR.mkdir(exist_ok=True)
app.mount("/uploads", StaticFiles(directory=str(UPLOADS_DIR)), name="uploads")

# Get allowed origins from environment
FRONTEND_URL = os.getenv("FRONTEND_URL", "http://localhost:5173")
allowed_origins = [FRONTEND_URL]
# Allow common localhost development ports
allowed_origins.extend([
    "http://localhost:5173",
    "http://localhost:5174",
    "http://127.0.0.1:5173",
    "http://127.0.0.1:5174",
])

# ─── RSVP URL builder ────────────────────────────────────────────────────────
def build_rsvp_url(event_id) -> str:
    """
    Build the public RSVP URL for an event.
    In DEV  → http://localhost:5173/guest/<event_id>
    In PROD → https://invy.dvirlabs.com/guest/<event_id>
    Controlled by FRONTEND_URL env var.
    """
    base = os.getenv("FRONTEND_URL", "http://localhost:5173").rstrip("/")
    return f"{base}/guest/{event_id}"


# Configure CORS
app.add_middleware(
    CORSMiddleware,
    allow_origins=allowed_origins,
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)


# ============================================
# Helper: Get current user from headers/cookies
# ============================================
def get_current_user_id(request: Request, db: Session = Depends(get_db)):
    """
    Extract current user from:
    1. X-User-ID header (set by frontend)
    2. _user_session cookie (from OAuth callback)
    
    Returns:
        User ID (UUID or string like 'admin-user') if authenticated, None if not authenticated
    """
    # Check for X-User-ID header (from admin login or OAuth)
    user_id_header = request.headers.get("X-User-ID")
    if user_id_header and user_id_header.strip():
        # Accept any non-empty user ID (admin-user, UUID, etc)
        return user_id_header
    
    # Check for session cookie set by OAuth callback
    user_id_cookie = request.cookies.get("_user_session")
    if user_id_cookie and user_id_cookie.strip():
        # Try to convert to UUID if it's a valid one, otherwise return as string
        try:
            return UUID(user_id_cookie)
        except ValueError:
            return user_id_cookie
    
    # Not authenticated - return None instead of raising error
    # Let endpoints decide whether to require authentication
    return None


# ============================================
# Root Endpoint
# ============================================
@app.get("/")
def read_root():
    return {"message": "Multi-Event Invitation Management API"}


# ============================================
# Image Upload Endpoint
# ============================================
ALLOWED_IMAGE_TYPES = {"image/jpeg", "image/png", "image/gif", "image/webp"}
MAX_IMAGE_SIZE = 10 * 1024 * 1024  # 10 MB

@app.post("/upload-image")
async def upload_image(
    file: UploadFile = File(...),
    current_user_id = Depends(get_current_user_id)
):
    """Upload an invitation background image. Returns the public URL."""
    if file.content_type not in ALLOWED_IMAGE_TYPES:
        raise HTTPException(status_code=400, detail="Only JPEG, PNG, GIF and WebP images are allowed")

    contents = await file.read()
    if len(contents) > MAX_IMAGE_SIZE:
        raise HTTPException(status_code=400, detail="Image must be smaller than 10 MB")

    ext = Path(file.filename).suffix.lower() if file.filename else ".jpg"
    if ext not in {".jpg", ".jpeg", ".png", ".gif", ".webp"}:
        ext = ".jpg"

    filename = f"{uuid4().hex}{ext}"
    dest = UPLOADS_DIR / filename
    dest.write_bytes(contents)

    base_url = os.getenv("BACKEND_URL", "http://localhost:8000")
    return {"url": f"{base_url}/uploads/{filename}"}


# ============================================
# Event Endpoints
# ============================================
@app.post("/events", response_model=schemas.Event)
def create_event(
    event: schemas.EventCreate,
    db: Session = Depends(get_db),
    current_user_id: UUID = Depends(get_current_user_id)
):
    """Create a new event (creator becomes admin). Requires authentication."""
    if not current_user_id:
        raise HTTPException(status_code=403, detail="Not authenticated. Please login with Google first.")
    
    return crud.create_event(db, event, current_user_id)


@app.get("/events", response_model=List[schemas.Event])
def list_events(
    db: Session = Depends(get_db),
    current_user_id: UUID = Depends(get_current_user_id)
):
    """List all events user is a member of. Returns empty list if not authenticated."""
    if not current_user_id:
        # Return empty list for unauthenticated users
        return []
    
    return crud.get_events_for_user(db, current_user_id)


@app.get("/events/{event_id}", response_model=schemas.EventWithMembers)
async def get_event(
    event_id: UUID,
    db: Session = Depends(get_db),
    current_user_id = Depends(get_current_user_id)
):
    """Get event details (only for members)"""
    authz_info = await authz.verify_event_access(event_id, db, current_user_id)
    
    event = crud.get_event(db, event_id)
    members = crud.get_event_members(db, event_id)
    event.members = members
    return event


@app.patch("/events/{event_id}", response_model=schemas.Event)
async def update_event(
    event_id: UUID,
    event_update: schemas.EventUpdate,
    db: Session = Depends(get_db),
    current_user_id: UUID = Depends(get_current_user_id)
):
    """Update event (admin only)"""
    authz_info = await authz.verify_event_admin(event_id, db, current_user_id)
    return crud.update_event(db, event_id, event_update)


@app.delete("/events/{event_id}")
async def delete_event(
    event_id: UUID,
    db: Session = Depends(get_db),
    current_user_id: UUID = Depends(get_current_user_id)
):
    """Delete event (admin only)"""
    authz_info = await authz.verify_event_admin(event_id, db, current_user_id)
    success = crud.delete_event(db, event_id)
    if not success:
        raise HTTPException(status_code=404, detail="Event not found")
    return {"message": "Event deleted successfully"}


# ============================================
# Event Member Endpoints
# ============================================
@app.post("/events/{event_id}/invite-member", response_model=schemas.EventMember)
async def invite_event_member(
    event_id: UUID,
    invite: schemas.EventMemberCreate,
    db: Session = Depends(get_db),
    current_user_id: UUID = Depends(get_current_user_id)
):
    """Invite user to event by email (admin only)"""
    authz_info = await authz.verify_event_admin(event_id, db, current_user_id)
    
    # Find or create user
    user = crud.get_or_create_user(db, invite.user_email)
    
    # Add to event
    member = crud.create_event_member(
        db, event_id, user.id, invite.role, invite.display_name
    )
    return member


@app.get("/events/{event_id}/members", response_model=List[schemas.EventMember])
async def list_event_members(
    event_id: UUID,
    db: Session = Depends(get_db),
    current_user_id: UUID = Depends(get_current_user_id)
):
    """List all members of an event"""
    authz_info = await authz.verify_event_access(event_id, db, current_user_id)
    return crud.get_event_members(db, event_id)


@app.patch("/events/{event_id}/members/{user_id}")
async def update_member_role(
    event_id: UUID,
    user_id: UUID,
    role_update: dict,
    db: Session = Depends(get_db),
    current_user_id: UUID = Depends(get_current_user_id)
):
    """Update member role (admin only)"""
    authz_info = await authz.verify_event_admin(event_id, db, current_user_id)
    
    member = crud.update_event_member_role(
        db, event_id, user_id, role_update.get("role", "viewer")
    )
    if not member:
        raise HTTPException(status_code=404, detail="Member not found")
    return member


@app.delete("/events/{event_id}/members/{user_id}")
async def remove_member(
    event_id: UUID,
    user_id: UUID,
    db: Session = Depends(get_db),
    current_user_id: UUID = Depends(get_current_user_id)
):
    """Remove member from event (admin only)"""
    authz_info = await authz.verify_event_admin(event_id, db, current_user_id)
    
    success = crud.remove_event_member(db, event_id, user_id)
    if not success:
        raise HTTPException(status_code=404, detail="Member not found")
    return {"message": "Member removed successfully"}


# ============================================
# Guest Endpoints (Event-Scoped)
# ============================================
@app.post("/events/{event_id}/guests", response_model=schemas.Guest)
async def create_guest(
    event_id: UUID,
    guest: schemas.GuestCreate,
    db: Session = Depends(get_db),
    current_user_id: UUID = Depends(get_current_user_id)
):
    """Add a single guest to event (editor+ only)"""
    authz_info = await authz.verify_event_editor(event_id, db, current_user_id)
    return crud.create_guest(db, event_id, guest, current_user_id)


@app.get("/events/{event_id}/guests", response_model=List[schemas.Guest])
async def list_guests(
    event_id: UUID,
    search: Optional[str] = Query(None),
    status: Optional[str] = Query(None),
    rsvp_status: Optional[str] = Query(None),
    side: Optional[str] = Query(None),
    owner: Optional[str] = Query(None),  # Filter by owner email or 'self-service'
    added_by_me: bool = Query(False),
    skip: int = Query(0),
    limit: int = Query(1000),
    db: Session = Depends(get_db),
    current_user_id: UUID = Depends(get_current_user_id)
):
    """List guests for event with optional filters. Requires authentication."""
    # Require authentication for this endpoint
    if not current_user_id:
        raise HTTPException(status_code=403, detail="Not authenticated. Please login with Google to continue.")
    
    authz_info = await authz.verify_event_access(event_id, db, current_user_id)
    
    # Support both old (status) and new (rsvp_status) parameter names
    filter_status = rsvp_status or status
    
    added_by_user_id = current_user_id if added_by_me else None
    guests = crud.search_guests(
        db, event_id, search, filter_status, side, added_by_user_id, owner_email=owner
    )
    return guests[skip:skip+limit]


@app.get("/events/{event_id}/guest-owners")
async def get_guest_owners(
    event_id: UUID,
    db: Session = Depends(get_db),
    current_user_id: UUID = Depends(get_current_user_id)
):
    """Get list of unique owners/sources for guests in an event. Requires authentication."""
    # Require authentication for this endpoint
    if not current_user_id:
        # Return empty result instead of error - allows UI to render without data
        return {
            "owners": [],
            "has_self_service": False,
            "total_guests": 0,
            "requires_login": True,
            "message": "Please login with Google to see event details"
        }
    
    authz_info = await authz.verify_event_access(event_id, db, current_user_id)
    
    # Query distinct owner_email values
    from sqlalchemy import distinct
    owners = db.query(distinct(models.Guest.owner_email)).filter(
        models.Guest.event_id == event_id
    ).all()
    
    # Extract values and filter out None
    owner_list = [owner[0] for owner in owners if owner[0]]
    owner_list.sort()
    
    # Check for self-service guests
    self_service_count = db.query(models.Guest).filter(
        models.Guest.event_id == event_id,
        models.Guest.source == "self-service"
    ).count()
    
    result = {
        "owners": owner_list,
        "has_self_service": self_service_count > 0,
        "total_guests": db.query(models.Guest).filter(
            models.Guest.event_id == event_id
        ).count()
    }
    
    return result


# ============================================
# Duplicate Detection & Merging
# ============================================
@app.get("/events/{event_id}/guests/duplicates")
async def get_duplicate_guests(
    event_id: UUID,
    by: str = Query("phone", description="'phone', 'email', or 'name'"),
    db: Session = Depends(get_db),
    current_user_id: UUID = Depends(get_current_user_id)
):
    """Find duplicate guests by phone, email, or name (members only)"""
    authz_info = await authz.verify_event_access(event_id, db, current_user_id)
    
    if by not in ["phone", "email", "name"]:
        raise HTTPException(status_code=400, detail="Invalid 'by' parameter. Must be 'phone', 'email', or 'name'")
    
    try:
        result = crud.find_duplicate_guests(db, event_id, by)
        return result
    except Exception as e:
        raise HTTPException(status_code=400, detail=f"Error finding duplicates: {str(e)}")


@app.post("/events/{event_id}/guests/merge")
async def merge_duplicate_guests(
    event_id: UUID,
    merge_request: dict,
    db: Session = Depends(get_db),
    current_user_id: UUID = Depends(get_current_user_id)
):
    """
    Merge duplicate guests (admin only)
    
    Request body:
    {
        "keep_id": "uuid-to-keep",
        "merge_ids": ["uuid1", "uuid2", ...]
    }
    """
    authz_info = await authz.verify_event_admin(event_id, db, current_user_id)
    
    keep_id = merge_request.get("keep_id")
    merge_ids = merge_request.get("merge_ids", [])
    
    if not keep_id:
        raise HTTPException(status_code=400, detail="keep_id is required")
    
    if not merge_ids or len(merge_ids) == 0:
        raise HTTPException(status_code=400, detail="merge_ids must be a non-empty list")
    
    try:
        # Convert string UUIDs to UUID objects
        keep_id = UUID(keep_id)
        merge_ids = [UUID(mid) for mid in merge_ids]
        
        result = crud.merge_guests(db, event_id, keep_id, merge_ids)
        return result
    except ValueError as e:
        raise HTTPException(status_code=404, detail=str(e))
    except Exception as e:
        raise HTTPException(status_code=400, detail=f"Error merging guests: {str(e)}")


@app.get("/events/{event_id}/guests/{guest_id}", response_model=schemas.Guest)
async def get_guest(
    event_id: UUID,
    guest_id: UUID,
    db: Session = Depends(get_db),
    current_user_id: UUID = Depends(get_current_user_id)
):
    """Get guest details"""
    authz_info = await authz.verify_event_access(event_id, db, current_user_id)
    guest = crud.get_guest(db, guest_id, event_id)
    if not guest:
        raise HTTPException(status_code=404, detail="Guest not found")
    return guest


@app.patch("/events/{event_id}/guests/{guest_id}", response_model=schemas.Guest)
async def update_guest(
    event_id: UUID,
    guest_id: UUID,
    guest_update: schemas.GuestUpdate,
    db: Session = Depends(get_db),
    current_user_id: UUID = Depends(get_current_user_id)
):
    """Update guest details (editor+ only)"""
    authz_info = await authz.verify_event_editor(event_id, db, current_user_id)
    guest = crud.update_guest(db, guest_id, event_id, guest_update)
    if not guest:
        raise HTTPException(status_code=404, detail="Guest not found")
    return guest


@app.delete("/events/{event_id}/guests/{guest_id}")
async def delete_guest(
    event_id: UUID,
    guest_id: UUID,
    db: Session = Depends(get_db),
    current_user_id: UUID = Depends(get_current_user_id)
):
    """Delete guest (admin only)"""
    authz_info = await authz.verify_event_admin(event_id, db, current_user_id)
    success = crud.delete_guest(db, guest_id, event_id)
    if not success:
        raise HTTPException(status_code=404, detail="Guest not found")
    return {"message": "Guest deleted successfully"}


# ============================================
# Bulk Guest Delete
# ============================================
@app.post("/events/{event_id}/guests/bulk-delete")
async def bulk_delete_guests(
    event_id: UUID,
    delete_data: schemas.GuestBulkDelete,
    db: Session = Depends(get_db),
    current_user_id: UUID = Depends(get_current_user_id)
):
    """Bulk delete guests (admin only)"""
    await authz.verify_event_admin(event_id, db, current_user_id)
    deleted_count = crud.delete_guests_bulk(db, event_id, delete_data.guest_ids)
    return {"message": f"{deleted_count} guests deleted successfully", "deleted_count": deleted_count}
@app.post("/events/{event_id}/guests/import", response_model=dict)
async def bulk_import_guests(
    event_id: UUID,
    import_data: schemas.GuestBulkImport,
    db: Session = Depends(get_db),
    current_user_id: UUID = Depends(get_current_user_id)
):
    """Bulk import guests (editor+ only)"""
    authz_info = await authz.verify_event_editor(event_id, db, current_user_id)
    
    guests = crud.bulk_import_guests(db, event_id, import_data.guests, current_user_id)
    return {
        "imported_count": len(guests),
        "guests": guests
    }


# ============================================
# Event Statistics
# ============================================
@app.get("/events/{event_id}/stats")
async def get_event_stats(
    event_id: UUID,
    db: Session = Depends(get_db),
    current_user_id: UUID = Depends(get_current_user_id)
):
    """Get event statistics (members only)"""
    authz_info = await authz.verify_event_access(event_id, db, current_user_id)
    
    stats = crud.get_event_stats(db, event_id)
    sides = crud.get_sides_summary(db, event_id)
    
    return {
        "stats": stats,
        "sides": sides
    }


# ============================================
# WhatsApp Messaging
# ============================================
@app.post("/events/{event_id}/guests/{guest_id}/whatsapp")
async def send_guest_message(
    event_id: UUID,
    guest_id: UUID,
    message_req: schemas.WhatsAppMessage,
    db: Session = Depends(get_db),
    current_user_id: UUID = Depends(get_current_user_id)
):
    """Send WhatsApp message to guest (members only)"""
    authz_info = await authz.verify_event_access(event_id, db, current_user_id)
    
    # Get guest
    guest = crud.get_guest(db, guest_id, event_id)
    if not guest:
        raise HTTPException(status_code=404, detail="Guest not found")
    
    # Use override phone or guest's phone
    phone = message_req.phone or guest.phone
    
    try:
        service = get_whatsapp_service(db)
        result = await service.send_text_message(phone, message_req.message)
        return result
    except WhatsAppError as e:
        raise HTTPException(status_code=400, detail=f"WhatsApp error: {str(e)}")
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"Failed to send message: {str(e)}")


@app.post("/events/{event_id}/whatsapp/broadcast")
async def broadcast_whatsapp_message(
    event_id: UUID,
    broadcast_req: dict,
    db: Session = Depends(get_db),
    current_user_id: UUID = Depends(get_current_user_id)
):
    """
    Broadcast WhatsApp message to multiple guests
    
    Request body:
    {
        "message": "Your message here",
        "guest_ids": ["uuid1", "uuid2"],  // optional: if not provided, send to all
        "filter_status": "confirmed"  // optional: filter by status
    }
    """
    authz_info = await authz.verify_event_access(event_id, db, current_user_id)
    
    message = broadcast_req.get("message", "")
    if not message:
        raise HTTPException(status_code=400, detail="Message is required")
    
    # Get guests to send to
    if broadcast_req.get("guest_ids"):
        guest_ids = [UUID(gid) for gid in broadcast_req["guest_ids"]]
        guests = []
        for gid in guest_ids:
            g = crud.get_guest(db, gid, event_id)
            if g:
                guests.append(g)
    elif broadcast_req.get("filter_status"):
        guests = crud.get_guests_by_status(db, event_id, broadcast_req["filter_status"])
    else:
        guests = crud.get_guests(db, event_id)
    
    # Send to all guests
    results = []
    failed = []
    
    try:
        service = get_whatsapp_service(db)
        for guest in guests:
            try:
                result = await service.send_text_message(guest.phone, message)
                results.append({
                    "guest_id": str(guest.id),
                    "phone": guest.phone,
                    "status": "sent",
                    "message_id": result.get("message_id")
                })
            except Exception as e:
                failed.append({
                    "guest_id": str(guest.id),
                    "phone": guest.phone,
                    "error": str(e)
                })
    except WhatsAppError as e:
        raise HTTPException(status_code=400, detail=f"WhatsApp error: {str(e)}")
    
    return {
        "total": len(guests),
        "sent": len(results),
        "failed": len(failed),
        "results": results,
        "failures": failed
    }


# ============================================
# WhatsApp Template Registry Endpoints
# ============================================
@app.get("/whatsapp/templates")
async def get_whatsapp_templates(db: Session = Depends(get_db)):
    """
    Return all registered WhatsApp templates (built-in + custom) for the frontend dropdown.
    """
    return {"templates": list_templates_for_frontend(db)}


@app.post("/whatsapp/templates")
async def create_whatsapp_template(
    body: dict,
    db: Session = Depends(get_db),
    current_user_id = Depends(get_current_user_id)
):
    """
    Create a new custom WhatsApp template.

    Expected body:
    {
        "key":               "my_template",          # unique key (no spaces)
        "friendly_name":     "My Template",
        "meta_name":         "my_template",          # exact name in Meta BM
        "language_code":     "he",
        "description":       "optional description",
        "header_type":       "TEXT" or "IMAGE",      # header type
        "header_text":       "היי {{1}}",            # raw text (for preview, TEXT headers)
        "header_handle":     "https://...",          # media URL or handle (IMAGE headers)
        "body_text":         "{{1}} ו-{{2}} ...",    # raw text (for preview)
        "header_param_keys": ["contact_name"],        # ordered param keys for header {{N}}
        "body_param_keys":   ["groom_name", "bride_name", ...],
        "button_type":       "URL",                  # optional button type
        "button_text":       "Visit Website",        # optional button label
        "button_url":        "https://...{{1}}",     # optional button URL (use {{1}} for dynamic)
        "button_param_key":  "event_id",             # param key for button {{1}} placeholder
        "fallbacks":         { "contact_name": "חבר", ... }
    }
    """
    if not current_user_id:
        raise HTTPException(status_code=403, detail="Not authenticated")

    key = body.get("key", "").strip().replace(" ", "_").lower()
    if not key:
        raise HTTPException(status_code=400, detail="'key' is required")
    if not body.get("meta_name", "").strip():
        raise HTTPException(status_code=400, detail="'meta_name' is required")
    if not body.get("friendly_name", "").strip():
        raise HTTPException(status_code=400, detail="'friendly_name' is required")

    template = {
        "meta_name":        body.get("meta_name", key),
        "language_code":    body.get("language_code", "he"),
        "friendly_name":    body["friendly_name"],
        "description":      body.get("description", ""),
        "header_type":      body.get("header_type", "TEXT"),
        "header_text":      body.get("header_text", ""),
        "header_handle":    body.get("header_handle", ""),
        "body_text":        body.get("body_text", ""),
        "header_params":    body.get("header_param_keys", []),
        "body_params":      body.get("body_param_keys", []),
        "button_type":      body.get("button_type", ""),
        "button_text":      body.get("button_text", ""),
        "button_url":       body.get("button_url", ""),
        "button_param_key": body.get("button_param_key", ""),
        "fallbacks":        body.get("fallbacks", {}),
        "guest_name_key":   body.get("guest_name_key", ""),
    }

    try:
        add_custom_template(db, key, template)
    except ValueError as e:
        raise HTTPException(status_code=409, detail=str(e))

    return {"status": "created", "key": key, "template": template}


@app.delete("/whatsapp/templates/{key}")
async def delete_whatsapp_template(
    key: str,
    db: Session = Depends(get_db),
    current_user_id = Depends(get_current_user_id)
):
    """Delete a custom template by key (built-in templates cannot be deleted)."""
    if not current_user_id:
        raise HTTPException(status_code=403, detail="Not authenticated")

    try:
        delete_custom_template(db, key)
    except ValueError as e:
        raise HTTPException(status_code=403, detail=str(e))
    except KeyError as e:
        raise HTTPException(status_code=404, detail=str(e))

    return {"status": "deleted", "key": key}



# ============================================
# WhatsApp Wedding Invitation Endpoints
# ============================================
@app.post("/events/{event_id}/guests/{guest_id}/whatsapp/invite", response_model=schemas.WhatsAppSendResult)
async def send_wedding_invitation_single(
    event_id: UUID,
    guest_id: UUID,
    request_body: Optional[dict] = None,
    db: Session = Depends(get_db),
    current_user_id: UUID = Depends(get_current_user_id)
):
    """Send wedding invitation template to a single guest"""
    if not current_user_id:
        raise HTTPException(status_code=403, detail="Not authenticated")
    
    authz_info = await authz.verify_event_access(event_id, db, current_user_id)
    
    # Get guest
    guest = crud.get_guest_for_whatsapp(db, event_id, guest_id)
    if not guest:
        raise HTTPException(status_code=404, detail="Guest not found")
    
    # Get event for template data
    event = crud.get_event_for_whatsapp(db, event_id)
    if not event:
        raise HTTPException(status_code=404, detail="Event not found")
    
    # Prepare phone (use override if provided)
    phone_override = request_body.get("phone_override") if request_body else None
    to_phone = phone_override or guest.phone_number or guest.phone
    
    if not to_phone:
        return schemas.WhatsAppSendResult(
            guest_id=str(guest.id),
            guest_name=f"{guest.first_name}",
            phone="",
            status="failed",
            error="No phone number available for guest"
        )
    
    try:
        # Format event details
        guest_name = guest.first_name or (f"{guest.first_name} {guest.last_name}".strip() or "חבר")
        event_date = event.date.strftime("%d/%m") if event.date else ""
        event_time = event.event_time or ""
        venue = event.venue or event.location or ""
        partner1 = event.partner1_name or ""
        partner2 = event.partner2_name or ""
        
        # Build guest link as clean /guest/<event_id> path so the frontend
        # regex can reliably extract the event_id from the URL.
        _gl_base = (event.guest_link or "https://invy.dvirlabs.com/guest").split("?")[0].rstrip("/")
        guest_link = f"{_gl_base}/{event_id}"
        
        service = get_whatsapp_service(db)
        result = await service.send_wedding_invitation(
            to_phone=to_phone,
            guest_name=guest_name,
            partner1_name=partner1,
            partner2_name=partner2,
            venue=venue,
            event_date=event_date,
            event_time=event_time,
            guest_link=guest_link,
            template_key=request_body.get("template_key") if request_body else None,
        )
        
        return schemas.WhatsAppSendResult(
            guest_id=str(guest.id),
            guest_name=guest_name,
            phone=to_phone,
            status="sent",
            message_id=result.get("message_id")
        )
    
    except WhatsAppError as e:
        return schemas.WhatsAppSendResult(
            guest_id=str(guest.id),
            guest_name=f"{guest.first_name}",
            phone=to_phone,
            status="failed",
            error=str(e)
        )
    except Exception as e:
        return schemas.WhatsAppSendResult(
            guest_id=str(guest.id),
            guest_name=f"{guest.first_name}",
            phone=to_phone,
            status="failed",
            error=f"Unexpected error: {str(e)}"
        )


@app.post("/events/{event_id}/whatsapp/invite", response_model=schemas.WhatsAppBulkResult)
async def send_wedding_invitation_bulk(
    event_id: UUID,
    request_body: schemas.WhatsAppWeddingInviteRequest,
    db: Session = Depends(get_db),
    current_user_id: UUID = Depends(get_current_user_id)
):
    """Send wedding invitation template to multiple guests"""
    if not current_user_id:
        raise HTTPException(status_code=403, detail="Not authenticated")
    
    authz_info = await authz.verify_event_access(event_id, db, current_user_id)
    
    # Get event for template data
    event = crud.get_event_for_whatsapp(db, event_id)
    if not event:
        raise HTTPException(status_code=404, detail="Event not found")
    
    # Get guests
    if request_body.guest_ids:
        guest_ids = [UUID(gid) for gid in request_body.guest_ids]
        guests = crud.get_guests_for_whatsapp(db, event_id, guest_ids)
    else:
        raise HTTPException(status_code=400, detail="guest_ids are required")
    
    # Send to all guests and collect results
    results = []
    import asyncio
    
    service = get_whatsapp_service(db)
    
    for guest in guests:
        try:
            # Prepare phone
            to_phone = request_body.phone_override or guest.phone_number or guest.phone
            
            if not to_phone:
                results.append(schemas.WhatsAppSendResult(
                    guest_id=str(guest.id),
                    guest_name=f"{guest.first_name}",
                    phone="",
                    status="failed",
                    error="No phone number available"
                ))
                continue
            
            # Build params — contact_name always comes from the guest record
            guest_name = f"{guest.first_name} {guest.last_name}".strip() or guest.first_name or "חבר"

            # Standard named params (built-in template keys) with DB fallbacks
            partner1 = (request_body.partner1_name or event.partner1_name or "").strip()
            partner2 = (request_body.partner2_name or event.partner2_name or "").strip()
            venue    = (request_body.venue or event.venue or event.location or "").strip()
            event_time = (request_body.event_time or event.event_time or "").strip()

            # Convert event_date YYYY-MM-DD → DD/MM if still in ISO format (backend fallback)
            if request_body.event_date:
                try:
                    from datetime import datetime as _dt
                    _d = _dt.strptime(request_body.event_date[:10], "%Y-%m-%d")
                    event_date = _d.strftime("%d/%m")
                except Exception:
                    event_date = request_body.event_date
            else:
                event_date = event.date.strftime("%d/%m") if event.date else ""

            # Build per-guest link — always unique per event + guest so that
            # a guest invited to multiple events gets a distinct URL each time.
            # Build a clean /guest/<event_id> path URL so the frontend regex
            # /^\/guest\/([a-f0-9-]{36})/ can reliably extract the event_id.
            _frontend_base = (event.guest_link or "https://invy.dvirlabs.com/guest").rstrip("/")
            # Strip any existing ?event= / ?guest_id= to avoid double params
            _frontend_base = _frontend_base.split("?")[0].rstrip("/")
            per_guest_link = f"{_frontend_base}/{event_id}"

            params = {
                "contact_name": guest_name,  # always auto from guest
                "groom_name":   partner1,
                "bride_name":   partner2,
                "venue":        venue,
                "event_date":   event_date,
                "event_time":   event_time,
                "guest_link":   per_guest_link,
                "guest_id":     str(guest.id),  # guest UUID for button {{1}}
            }

            # Merge extra_params (user-supplied values for custom param keys)
            if request_body.extra_params:
                params.update(request_body.extra_params)

            # Always re-apply auto-computed values last so they can't be overridden
            params["guest_link"] = per_guest_link  # final override — always per-guest

            # Auto-inject guest_name_key + event_id for url_button templates
            try:
                from whatsapp_templates import get_template as _get_tpl
                _tpl_def = _get_tpl(db, request_body.template_key or "wedding_invitation")
                _gnk = _tpl_def.get("guest_name_key", "")
                if _gnk:
                    params[_gnk] = guest.first_name or guest_name

                # For URL-button templates: inject event_id as the button URL suffix
                # The Meta template base URL is https://invy.dvirlabs.com/guest/
                # The button variable {{1}} = event_id  → final URL = /guest/{event_id}
                _url_btn = _tpl_def.get("url_button", {})
                if _url_btn and _url_btn.get("enabled"):
                    _param_key = _url_btn.get("param_key", "event_id")
                    params[_param_key] = str(event_id)
            except Exception:
                pass

            result = await service.send_by_template_key(
                template_key=request_body.template_key or "wedding_invitation",
                to_phone=to_phone,
                params=params,
            )
            
            # Commit any pending DB changes (e.g. RSVP token) on successful send
            db.commit()

            results.append(schemas.WhatsAppSendResult(
                guest_id=str(guest.id),
                guest_name=guest_name,
                phone=to_phone,
                status="sent",
                message_id=result.get("message_id")
            ))
            
            # Small delay to avoid rate limiting
            await asyncio.sleep(0.5)
        
        except WhatsAppError as e:
            db.rollback()
            results.append(schemas.WhatsAppSendResult(
                guest_id=str(guest.id),
                guest_name=f"{guest.first_name}",
                phone=guest.phone_number or guest.phone or "unknown",
                status="failed",
                error=str(e)
            ))
        except Exception as e:
            db.rollback()
            results.append(schemas.WhatsAppSendResult(
                guest_id=str(guest.id),
                guest_name=f"{guest.first_name}",
                phone=guest.phone_number or guest.phone or "unknown",
                status="failed",
                error=f"Unexpected error: {str(e)}"
            ))
    
    # Calculate results
    succeeded = sum(1 for r in results if r.status == "sent")
    failed = sum(1 for r in results if r.status == "failed")
    
    return schemas.WhatsAppBulkResult(
        total=len(guests),
        succeeded=succeeded,
        failed=failed,
        results=results
    )


# ============================================
# Google OAuth Integration
# ============================================
@app.get("/auth/google")
async def get_google_auth_url(
    event_id: Optional[str] = None
):
    """
    Initiate Google OAuth flow - redirects to Google.
    """
    client_id = os.getenv("GOOGLE_CLIENT_ID")
    redirect_uri = os.getenv("GOOGLE_REDIRECT_URI", "http://localhost:8000/auth/google/callback")
    
    if not client_id:
        raise HTTPException(status_code=500, detail="Google Client ID not configured")
    
    # Google OAuth2 authorization endpoint
    auth_url = "https://accounts.google.com/o/oauth2/v2/auth"
    
    params = {
        "client_id": client_id,
        "redirect_uri": redirect_uri,
        "response_type": "code",
        "scope": "https://www.googleapis.com/auth/contacts.readonly https://www.googleapis.com/auth/userinfo.email",
        "access_type": "offline",
        "state": event_id or "default"  # Pass event_id as state for later use
    }
    
    full_url = f"{auth_url}?{urlencode(params)}"
    
    # Redirect to Google OAuth endpoint
    return RedirectResponse(url=full_url)


@app.get("/auth/google/callback")
async def google_callback(
    code: str = Query(None),
    state: str = Query(None),
    error: str = Query(None),
    db: Session = Depends(get_db)
):
    """
    Handle Google OAuth callback.
    Exchanges authorization code for access token and imports contacts.
    """
    logger.info(f"Google OAuth callback received - state: {state}, has_code: {bool(code)}, error: {error}")
    
    if error:
        frontend_url = os.getenv("FRONTEND_URL", "http://localhost:5173")
        error_url = f"{frontend_url}?error={quote(error)}"
        return RedirectResponse(url=error_url)
    
    if not code:
        frontend_url = os.getenv("FRONTEND_URL", "http://localhost:5173")
        return RedirectResponse(url=f"{frontend_url}?error={quote('Missing authorization code')}")
    
    client_id = os.getenv("GOOGLE_CLIENT_ID")
    client_secret = os.getenv("GOOGLE_CLIENT_SECRET")
    redirect_uri = os.getenv("GOOGLE_REDIRECT_URI", "http://localhost:8000/auth/google/callback")
    
    if not client_id or not client_secret:
        raise HTTPException(status_code=500, detail="Google OAuth credentials not configured")
    
    try:
        ssl_ctx = ssl.create_default_context(cafile=certifi.where())
        async with httpx.AsyncClient(verify=ssl_ctx) as client_http:
            # Exchange authorization code for access token
            token_url = "https://oauth2.googleapis.com/token"
            
            token_data = {
                "client_id": client_id,
                "client_secret": client_secret,
                "code": code,
                "grant_type": "authorization_code",
                "redirect_uri": redirect_uri
            }
            
            response = await client_http.post(token_url, data=token_data)
            
            if response.status_code != 200:
                error_detail = response.json().get("error_description", response.text)
                frontend_url = os.getenv("FRONTEND_URL", "http://localhost:5173")
                return RedirectResponse(url=f"{frontend_url}?error={quote(error_detail)}")
            
            tokens = response.json()
            access_token = tokens.get("access_token")
            
            if not access_token:
                frontend_url = os.getenv("FRONTEND_URL", "http://localhost:5173")
                return RedirectResponse(url=f"{frontend_url}?error={quote('No access token')}")
            
            # Get user info to extract email
            user_info_response = await client_http.get(
                "https://www.googleapis.com/oauth2/v2/userinfo",
                headers={"Authorization": f"Bearer {access_token}"}
            )
            
            if user_info_response.status_code != 200:
                frontend_url = os.getenv("FRONTEND_URL", "http://localhost:5173")
                return RedirectResponse(url=f"{frontend_url}?error={quote('Failed to get user info')}")
            
            user_info = user_info_response.json()
            user_email = user_info.get("email", "unknown")
            
            # Look up or create a User for this Google account imports
            # Since Google login is only for imports, we create a minimal user entry
            user = db.query(models.User).filter(models.User.email == user_email).first()
            if not user:
                user = models.User(email=user_email)
                db.add(user)
                db.commit()
                db.refresh(user)
            
            # Import contacts - get event_id from state parameter
            event_id = state if state and state != "default" else None
            
            try:
                imported_count = await google_contacts.import_contacts_from_google(
                    access_token=access_token,
                    db=db,
                    owner_email=user_email,
                    added_by_user_id=str(user.id),
                    event_id=event_id
                )
                
                logger.info(f"Successfully imported {imported_count} contacts from Google for event {event_id}")
                
                # Success - return HTML that sets sessionStorage with import details and redirects
                frontend_url = os.getenv("FRONTEND_URL", "http://localhost:5173")
                
                if event_id:
                    # Build the target URL - redirect back to the event
                    target_url = f"{frontend_url}/events/{event_id}/guests"
                else:
                    target_url = frontend_url
                
                # Return HTML that sets sessionStorage and redirects
                html_content = f"""
                <!DOCTYPE html>
                <html>
                <head>
                    <title>Import Complete</title>
                </head>
                <body>
                    <script>
                        // Store import completion info for the UI to display
                        sessionStorage.setItem('googleImportJustCompleted', 'true');
                        sessionStorage.setItem('googleImportCount', '{imported_count}');
                        sessionStorage.setItem('googleImportEmail', '{user_email}');
                        
                        window.location.href = '{target_url}';
                    </script>
                    <p>Redirecting...</p>
                </body>
                </html>
                """
                
                return HTMLResponse(content=html_content)
                
            except Exception as import_error:
                logger.error(f"Failed to import contacts from Google: {str(import_error)}", exc_info=True)
                frontend_url = os.getenv("FRONTEND_URL", "http://localhost:5173")
                return RedirectResponse(url=f"{frontend_url}?error={quote(f'Import failed: {str(import_error)}')}")
            
    except Exception as e:
        logger.error(f"OAuth callback error: {str(e)}", exc_info=True)
        frontend_url = os.getenv("FRONTEND_URL", "http://localhost:5173")
        return RedirectResponse(url=f"{frontend_url}?error={quote('OAuth error')}")


@app.post("/events/{event_id}/import-google-contacts")
async def import_google_contacts(
    event_id: UUID,
    import_data: schemas.GoogleContactsImport,
    db: Session = Depends(get_db),
    current_user_id: UUID = Depends(get_current_user_id)
):
    """
    Deprecated: Use /auth/google endpoint instead.
    This endpoint is kept for backward compatibility.
    """
    raise HTTPException(
        status_code=410, 
        detail="Google import flow has been updated. Use the Google Import button instead."
    )


# ============================================
# Public Guest Self-Service Endpoints
# ============================================
@app.get("/public/guest/{phone_number}")
def get_guest_by_phone(phone_number: str, db: Session = Depends(get_db)):
    """
    Public endpoint: Get guest info by phone number (no authentication required)
    Used for guest self-service lookup via shared link
    
    Returns:
        - {found: true, guest_data} if guest found
        - {found: false, phone_number} if not found
    """
    guest = db.query(models.Guest).filter(
        models.Guest.phone_number == phone_number
    ).first()
    
    if not guest:
        return {"found": False, "phone_number": phone_number}
    
    # Return guest data (exclude sensitive fields if needed)
    guest_dict = {
        "found": True,
        "first_name": guest.first_name,
        "last_name": guest.last_name,
        "phone_number": guest.phone_number,
        "email": guest.email,
        "rsvp_status": guest.rsvp_status,
        "meal_preference": guest.meal_preference,
        "has_plus_one": guest.has_plus_one,
        "plus_one_name": guest.plus_one_name,
    }
    return guest_dict


@app.put("/public/guest/{phone_number}")
def update_guest_by_phone(
    phone_number: str,
    guest_update: schemas.GuestPublicUpdate,
    db: Session = Depends(get_db)
):
    """
    Public endpoint: Allow guests to update their own info using phone number
    No authentication required - guests can use shared URLs with phone number
    
    Features:
    - Updates existing guest fields (first_name, last_name override imported values)
    - Used for self-service RSVP and preference collection
    - Guest must exist (typically from Google import) - returns 404 if not found
    """
    guest = db.query(models.Guest).filter(
        models.Guest.phone_number == phone_number
    ).first()
    
    if not guest:
        # Guest not found - return 404
        raise HTTPException(
            status_code=404,
            detail=f"Guest with phone number {phone_number} not found. Please check the number and try again."
        )
    
    # Update existing guest - override with provided values
    # This allows guests to correct their names/preferences even if imported from contacts
    if guest_update.first_name is not None:
        guest.first_name = guest_update.first_name
    if guest_update.last_name is not None:
        guest.last_name = guest_update.last_name
    if guest_update.rsvp_status is not None:
        guest.rsvp_status = guest_update.rsvp_status
    if guest_update.meal_preference is not None:
        guest.meal_preference = guest_update.meal_preference
    if guest_update.has_plus_one is not None:
        guest.has_plus_one = guest_update.has_plus_one
    if guest_update.plus_one_name is not None:
        guest.plus_one_name = guest_update.plus_one_name
    
    db.commit()
    db.refresh(guest)
    
    return {
        "id": guest.id,
        "first_name": guest.first_name,
        "last_name": guest.last_name,
        "phone_number": guest.phone_number,
        "email": guest.email,
        "rsvp_status": guest.rsvp_status,
        "meal_preference": guest.meal_preference,
        "has_plus_one": guest.has_plus_one,
        "plus_one_name": guest.plus_one_name,
    }





# ============================================
# Event-Scoped Public RSVP Endpoints
# Guest RSVP flow: /guest/:eventId → phone lookup → RSVP form → submit
# ============================================

@app.get("/public/events/{event_id}")
def get_public_event(event_id: UUID, db: Session = Depends(get_db)):
    """
    Public: return event details for the RSVP landing page.
    No authentication required — the event_id comes from the WhatsApp button URL.
    """
    event = db.query(models.Event).filter(models.Event.id == event_id).first()
    if not event:
        raise HTTPException(status_code=404, detail="האירוע לא נמצא.")
    event_date_str = event.date.strftime("%d/%m/%Y") if event.date else None
    return {
        "event_id": str(event.id),
        "name": event.name,
        "date": event_date_str,
        "venue": event.venue or event.location,
        "partner1_name": event.partner1_name,
        "partner2_name": event.partner2_name,
        "event_time": event.event_time,
        "invitation_image_url": event.invitation_image_url,
        "guest_form_fields": event.guest_form_fields,
    }


@app.get("/public/events/{event_id}/guest")
def get_event_guest_by_phone(
    event_id: UUID,
    phone: str = Query(..., description="Guest phone number"),
    db: Session = Depends(get_db),
):
    """
    Public: look up a guest in a specific event by phone number.
    Returns only that event's guest record — fully independent between events.
    """
    from whatsapp import WhatsAppService as _WAS
    normalized = _WAS.normalize_phone_to_e164(phone)

    guest = db.query(models.Guest).filter(
        models.Guest.event_id == event_id,
        or_(
            models.Guest.phone_number == phone,
            models.Guest.phone == phone,
            models.Guest.phone_number == normalized,
            models.Guest.phone == normalized,
        ),
    ).first()

    if not guest:
        # Guest not in list — allow self-service registration instead of blocking
        return {
            "found": False,
            "phone_number": normalized or phone,
        }

    return {
        "found": True,
        "guest_id": str(guest.id),
        # NOTE: first_name / last_name intentionally omitted so the guest
        # never sees the host's contact nickname — they enter their own name.
        "rsvp_status": guest.rsvp_status,
        "meal_preference": guest.meal_preference,
        "has_plus_one": guest.has_plus_one,
        "plus_one_name": guest.plus_one_name,
    }


@app.post("/public/events/{event_id}/rsvp")
def submit_event_rsvp(
    event_id: UUID,
    data: schemas.EventScopedRsvpUpdate,
    db: Session = Depends(get_db),
):
    """
    Public: update RSVP for a guest in a specific event.
    Guest is identified by phone; update is scoped to ONLY this event's record.
    Same phone guest in a different event is NOT affected.
    """
    from whatsapp import WhatsAppService as _WAS
    normalized = _WAS.normalize_phone_to_e164(data.phone)

    guest = db.query(models.Guest).filter(
        models.Guest.event_id == event_id,
        or_(
            models.Guest.phone_number == data.phone,
            models.Guest.phone == data.phone,
            models.Guest.phone_number == normalized,
            models.Guest.phone == normalized,
        ),
    ).first()

    if not guest:
        # Guest not pre-imported — create them as a self-service entry
        event_obj = db.query(models.Event).filter(models.Event.id == event_id).first()
        if not event_obj:
            raise HTTPException(status_code=404, detail="האירוע לא נמצא.")

        # Find the event admin to use as added_by_user_id
        admin_member = (
            db.query(models.EventMember)
            .filter(
                models.EventMember.event_id == event_id,
                models.EventMember.role == models.RoleEnum.admin,
            )
            .first()
        )
        if not admin_member:
            admin_member = (
                db.query(models.EventMember)
                .filter(models.EventMember.event_id == event_id)
                .first()
            )
        if not admin_member:
            raise HTTPException(status_code=404, detail="האירוע לא נמצא.")

        guest = models.Guest(
            event_id=event_id,
            added_by_user_id=admin_member.user_id,
            first_name=data.first_name or "",
            last_name=data.last_name or "",
            phone_number=normalized,
            phone=normalized,
            rsvp_status=data.rsvp_status or models.GuestStatus.invited,
            meal_preference=data.meal_preference,
            companion_count=data.companion_count or 1,
            source="self-service",
        )
        db.add(guest)
        db.commit()
        db.refresh(guest)

        return {
            "success": True,
            "message": "תודה! אישור ההגעה שלך נשמר.",
            "guest_id": str(guest.id),
            "rsvp_status": guest.rsvp_status,
        }

    if data.rsvp_status is not None:
        guest.rsvp_status = data.rsvp_status
    if data.meal_preference is not None:
        guest.meal_preference = data.meal_preference
    if data.companion_count is not None:
        guest.companion_count = data.companion_count
    if data.first_name is not None:
        guest.first_name = data.first_name
    if data.last_name is not None:
        guest.last_name = data.last_name

    db.commit()
    db.refresh(guest)

    return {
        "success": True,
        "message": "תודה! אישור ההגעה שלך נשמר.",
        "guest_id": str(guest.id),
        "rsvp_status": guest.rsvp_status,
    }


# ============================================
# RSVP Token Endpoints
# ============================================

@app.get("/rsvp/resolve", response_model=schemas.RsvpResolveResponse)
def rsvp_resolve(
    token: str = Query(..., description="Per-guest RSVP token from WhatsApp link"),
    db: Session = Depends(get_db),
):
    """
    Public endpoint: resolve an RSVP token and return event + guest details.
    Called automatically when a guest opens their personal WhatsApp RSVP link.
    No authentication required.
    """
    record = db.query(models.RsvpToken).filter(models.RsvpToken.token == token).first()
    if not record:
        return schemas.RsvpResolveResponse(valid=False, token=token, error="הקישור אינו תקין.")

    # Check expiry
    if record.expires_at:
        from datetime import datetime as _dt
        if _dt.now(timezone.utc) > record.expires_at:
            return schemas.RsvpResolveResponse(valid=False, token=token, error="הקישור פג תוקף.")

    event = db.query(models.Event).filter(models.Event.id == record.event_id).first()
    guest = db.query(models.Guest).filter(models.Guest.id == record.guest_id).first() if record.guest_id else None

    event_date_str = None
    if event and event.date:
        event_date_str = event.date.strftime("%d/%m/%Y")

    return schemas.RsvpResolveResponse(
        valid=True,
        token=token,
        event_id=str(record.event_id),
        event_name=event.name if event else None,
        event_date=event_date_str,
        venue=event.venue or event.location if event else None,
        partner1_name=event.partner1_name if event else None,
        partner2_name=event.partner2_name if event else None,
        guest_id=str(guest.id) if guest else None,
        guest_first_name=guest.first_name if guest else None,
        guest_last_name=guest.last_name if guest else None,
        current_rsvp_status=guest.rsvp_status if guest else None,
        current_meal_preference=guest.meal_preference if guest else None,
        current_has_plus_one=guest.has_plus_one if guest else None,
        current_plus_one_name=guest.plus_one_name if guest else None,
    )


@app.post("/rsvp/submit", response_model=schemas.RsvpSubmitResponse)
def rsvp_submit(
    data: schemas.RsvpSubmit,
    db: Session = Depends(get_db),
):
    """
    Public endpoint: guest submits their RSVP using token.
    Updates guest record and marks token as used.
    No authentication required.
    """
    from datetime import datetime as _dt

    record = db.query(models.RsvpToken).filter(models.RsvpToken.token == data.token).first()
    if not record:
        raise HTTPException(status_code=404, detail="הקישור אינו תקין.")

    if record.expires_at and _dt.now(timezone.utc) > record.expires_at:
        raise HTTPException(status_code=410, detail="הקישור פג תוקף.")

    # Update guest record
    guest = db.query(models.Guest).filter(models.Guest.id == record.guest_id).first() if record.guest_id else None
    if not guest:
        raise HTTPException(status_code=404, detail="לא נמצא אורח.")

    if data.rsvp_status is not None:
        guest.rsvp_status = data.rsvp_status
    if data.meal_preference is not None:
        guest.meal_preference = data.meal_preference
    if data.has_plus_one is not None:
        guest.has_plus_one = data.has_plus_one
    if data.plus_one_name is not None:
        guest.plus_one_name = data.plus_one_name
    if data.first_name is not None:
        guest.first_name = data.first_name
    if data.last_name is not None:
        guest.last_name = data.last_name

    # Mark token as used (allow re-use — don't block if already used)
    record.used_at = _dt.now(timezone.utc)

    db.commit()
    db.refresh(guest)

    return schemas.RsvpSubmitResponse(
        success=True,
        message="תודה! אישור ההגעה שלך נשמר בהצלחה.",
        guest_id=str(guest.id),
    )


# ============================================
# Contact Import Endpoint
# POST /admin/import/contacts?event_id=<uuid>&dry_run=false
# Accepts: multipart/form-data with file field "file" (CSV or JSON)
# ============================================

def _normalize_phone(raw: str) -> str:
    """Normalize a phone number to E.164 (+972…) format, best-effort."""
    if not raw:
        return raw
    try:
        from whatsapp import WhatsAppService as _WAS
        return _WAS.normalize_phone_to_e164(raw) or raw.strip()
    except Exception:
        return raw.strip()


def _parse_csv_rows(content: bytes) -> list[dict]:
    """Parse a CSV file and return a list of dicts (header row as keys)."""
    text = content.decode("utf-8-sig", errors="replace")  # handle BOM
    reader = csv.DictReader(io.StringIO(text))
    return [dict(row) for row in reader]


def _parse_xlsx_rows(content: bytes) -> list[dict]:
    """Parse an XLSX (Excel) file and return a list of dicts.
    Uses the first sheet; first row is treated as the header.
    """
    import openpyxl
    wb = openpyxl.load_workbook(io.BytesIO(content), read_only=True, data_only=True)
    ws = wb.active
    rows = list(ws.iter_rows(values_only=True))
    wb.close()
    if not rows:
        return []
    # First row = headers; normalise None headers to empty string
    headers = [str(h).strip() if h is not None else "" for h in rows[0]]
    result = []
    for row in rows[1:]:
        # Skip completely empty rows
        if all(v is None or str(v).strip() == "" for v in row):
            continue
        result.append({
            headers[i]: (str(v).strip() if v is not None else "")
            for i, v in enumerate(row)
            if i < len(headers) and headers[i]  # skip header-less columns
        })
    return result


def _parse_json_rows(content: bytes) -> list[dict]:
    """Parse a JSON file — supports array at root OR {data: [...]}."""
    payload = json.loads(content.decode("utf-8-sig", errors="replace"))
    if isinstance(payload, list):
        return payload
    if isinstance(payload, dict):
        for key in ("data", "contacts", "guests", "rows"):
            if key in payload and isinstance(payload[key], list):
                return payload[key]
    raise ValueError("JSON must be an array or an object with a list field.")


# Case-insensitive header normalization map
_FIELD_ALIASES: dict[str, str] = {
    # first_name
    "first name": "first_name", "firstname": "first_name", "שם פרטי": "first_name",
    # last_name
    "last name": "last_name", "lastname": "last_name", "שם משפחה": "last_name",
    # full_name
    "full name": "full_name", "fullname": "full_name", "name": "full_name", "שם מלא": "full_name",
    # phone
    "phone": "phone", "phone number": "phone", "mobile": "phone",
    "טלפון": "phone", "נייד": "phone", "phone_number": "phone",
    # email
    "email": "email", "email address": "email", "אימייל": "email",
    # rsvp status
    "rsvp": "rsvp_status", "rsvp status": "rsvp_status", "status": "rsvp_status",
    "סטטוס": "rsvp_status",
    # meal
    "meal": "meal_preference", "meal preference": "meal_preference",
    "meal_preference": "meal_preference", "העדפת ארוחה": "meal_preference",
    # notes
    "notes": "notes", "הערות": "notes",
    # side
    "side": "side", "צד": "side",
    # table
    "table": "table_number", "table number": "table_number", "שולחן": "table_number",
    # has_plus_one
    "plus one": "has_plus_one", "has plus one": "has_plus_one",
    "has_plus_one": "has_plus_one",
    # plus_one_name
    "plus one name": "plus_one_name", "plus_one_name": "plus_one_name",
}


def _normalize_row(raw: dict) -> dict:
    """Normalise column headers to canonical field names."""
    out = {}
    for k, v in raw.items():
        canonical = _FIELD_ALIASES.get(k.strip().lower(), k.strip().lower())
        out[canonical] = v.strip() if isinstance(v, str) else v
    return out


def _split_full_name(full: str) -> tuple[str, str]:
    parts = full.strip().split(None, 1)
    if len(parts) == 2:
        return parts[0], parts[1]
    return parts[0], "" if parts else ("", "")


def _coerce_bool(val) -> bool:
    if isinstance(val, bool):
        return val
    if isinstance(val, str):
        return val.strip().lower() in ("1", "yes", "true", "כן")
    return bool(val)


@app.post("/admin/import/contacts", response_model=schemas.ImportContactsResponse)
async def import_contacts(
    event_id: UUID = Query(..., description="Target event UUID"),
    dry_run: bool = Query(False, description="If true, validate and preview but do not write"),
    file: UploadFile = File(..., description="CSV or JSON file"),
    db: Session = Depends(get_db),
    current_user_id=Depends(get_current_user_id),
):
    """
    Import contacts from a CSV or JSON file into an event's guest list.

    • Idempotent: if a guest with the same phone_number already exists in this
      event, their *missing* fields are filled in — existing data is never
      overwritten unless the existing value is blank.
    • dry_run=true: returns the preview without touching the database.
    • source is always set to 'google' for imported rows.
    """
    # ── Auth / access check ──────────────────────────────────────────────────
    if not current_user_id:
        raise HTTPException(status_code=401, detail="Authentication required.")

    event = db.query(models.Event).filter(models.Event.id == event_id).first()
    if not event:
        raise HTTPException(status_code=404, detail="Event not found.")

    # ── Read and parse the uploaded file ────────────────────────────────────
    content = await file.read()
    filename = (file.filename or "").lower()
    try:
        if filename.endswith(".json"):
            raw_rows = _parse_json_rows(content)
        elif filename.endswith(".xlsx"):
            raw_rows = _parse_xlsx_rows(content)
        elif filename.endswith(".csv"):
            raw_rows = _parse_csv_rows(content)
        else:
            # Sniff: try JSON → xlsx magic bytes → CSV
            try:
                raw_rows = _parse_json_rows(content)
            except Exception:
                # XLSX files start with PK (zip magic bytes 50 4B)
                if content[:2] == b'PK':
                    raw_rows = _parse_xlsx_rows(content)
                else:
                    raw_rows = _parse_csv_rows(content)
    except Exception as exc:
        raise HTTPException(status_code=422, detail=f"Cannot parse file: {exc}")

    if not raw_rows:
        raise HTTPException(status_code=422, detail="File is empty or could not be parsed.")

    # ── Resolve or create the user record for added_by_user_id ──────────────
    # current_user_id can be a UUID object, a UUID string, or a plain string (email/admin-user)
    user = None
    try:
        _uid = UUID(str(current_user_id))
        user = db.query(models.User).filter(models.User.id == _uid).first()
    except (ValueError, AttributeError):
        pass
    if user is None:
        user = db.query(models.User).filter(
            models.User.email == str(current_user_id)
        ).first()
    if user is None:
        # Create a stub user (can happen if logged in via Google but no DB row yet)
        user = models.User(email=str(current_user_id))
        if not dry_run:
            db.add(user)
            db.flush()

    # ── Process rows ─────────────────────────────────────────────────────────
    results: list[schemas.ImportRowResult] = []
    counters = {"created": 0, "updated": 0, "skipped": 0, "errors": 0}

    for idx, raw in enumerate(raw_rows, start=1):
        row = _normalize_row(raw)

        # Resolve name
        first = row.get("first_name") or ""
        last  = row.get("last_name")  or ""
        if not first and row.get("full_name"):
            first, last = _split_full_name(row["full_name"])

        if not first:
            counters["skipped"] += 1
            results.append(schemas.ImportRowResult(
                row=idx, action="skipped", reason="No name found"
            ))
            continue

        # Resolve phone
        raw_phone = row.get("phone") or row.get("phone_number") or ""
        phone = _normalize_phone(raw_phone) if raw_phone else None

        email = row.get("email") or None

        # Must have at least phone or email to identify the guest
        if not phone and not email:
            counters["skipped"] += 1
            results.append(schemas.ImportRowResult(
                row=idx, action="skipped", name=f"{first} {last}".strip(),
                reason="No phone or email — cannot identify guest"
            ))
            continue

        # ── Idempotent lookup ──────────────────────────────────────────────
        existing = None
        if phone:
            existing = db.query(models.Guest).filter(
                models.Guest.event_id == event_id,
                or_(
                    models.Guest.phone_number == phone,
                    models.Guest.phone == phone,
                    models.Guest.phone_number == raw_phone,
                    models.Guest.phone == raw_phone,
                ),
            ).first()
        if existing is None and email:
            existing = db.query(models.Guest).filter(
                models.Guest.event_id == event_id,
                models.Guest.email == email,
            ).first()

        # ── Map optional fields ────────────────────────────────────────────
        rsvp_raw = (row.get("rsvp_status") or "").lower()
        rsvp_map = {"accepted": "confirmed", "pending": "invited", "yes": "confirmed",
                    "no": "declined", "כן": "confirmed", "לא": "declined"}
        rsvp = rsvp_map.get(rsvp_raw, rsvp_raw) if rsvp_raw else None
        if rsvp and rsvp not in ("invited", "confirmed", "declined"):
            rsvp = "invited"

        has_plus = _coerce_bool(row["has_plus_one"]) if "has_plus_one" in row else None

        if existing:
            # Update only blank fields — never overwrite existing data
            changed = False
            if not existing.first_name and first:
                existing.first_name = first; changed = True
            if not existing.last_name and last:
                existing.last_name = last; changed = True
            if not existing.email and email:
                existing.email = email; changed = True
            if not existing.phone_number and phone:
                existing.phone_number = phone; existing.phone = phone; changed = True
            if not existing.meal_preference and row.get("meal_preference"):
                existing.meal_preference = row["meal_preference"]; changed = True
            if not existing.notes and row.get("notes"):
                existing.notes = row["notes"]; changed = True
            if not existing.side and row.get("side"):
                existing.side = row["side"]; changed = True
            if not existing.table_number and row.get("table_number"):
                existing.table_number = row["table_number"]; changed = True
            if has_plus is not None and not existing.has_plus_one:
                existing.has_plus_one = has_plus; changed = True
            if not existing.plus_one_name and row.get("plus_one_name"):
                existing.plus_one_name = row["plus_one_name"]; changed = True
            if rsvp and existing.rsvp_status in (None, "invited", models.GuestStatus.invited):
                existing.rsvp_status = rsvp; changed = True

            if changed:
                counters["updated"] += 1
                action = "updated"
            else:
                counters["skipped"] += 1
                action = "skipped"

            results.append(schemas.ImportRowResult(
                row=idx, action=action,
                name=f"{existing.first_name} {existing.last_name}".strip(),
                phone=existing.phone_number,
            ))
        else:
            # Create new guest
            # On dry_run user.id may be None (not flushed); use a placeholder UUID
            _added_by = user.id
            if _added_by is None:
                try:
                    _added_by = UUID(str(current_user_id))
                except ValueError:
                    _added_by = uuid4()  # unreachable in prod, safety net
            new_guest = models.Guest(
                event_id=event_id,
                added_by_user_id=_added_by,
                first_name=first,
                last_name=last,
                email=email,
                phone_number=phone,
                phone=phone,
                rsvp_status=rsvp or models.GuestStatus.invited,
                meal_preference=row.get("meal_preference") or None,
                has_plus_one=has_plus or False,
                plus_one_name=row.get("plus_one_name") or None,
                table_number=row.get("table_number") or None,
                side=row.get("side") or None,
                notes=row.get("notes") or None,
                owner_email=str(current_user_id),
                source="google",
            )
            if not dry_run:
                db.add(new_guest)
            counters["created"] += 1
            results.append(schemas.ImportRowResult(
                row=idx, action="created" if not dry_run else "would_create",
                name=f"{first} {last}".strip(),
                phone=phone,
            ))

    # ── Commit or rollback ────────────────────────────────────────────────
    if dry_run:
        db.rollback()
    else:
        try:
            db.commit()
        except Exception as exc:
            db.rollback()
            logger.error("Import commit failed: %s", exc)
            raise HTTPException(status_code=500, detail=f"Database error: {exc}")

    logger.info(
        "Import %s event=%s total=%d created=%d updated=%d skipped=%d errors=%d",
        "[dry-run]" if dry_run else "[committed]",
        event_id, len(raw_rows),
        counters["created"], counters["updated"],
        counters["skipped"], counters["errors"],
    )

    return schemas.ImportContactsResponse(
        dry_run=dry_run,
        total=len(raw_rows),
        created=counters["created"],
        updated=counters["updated"],
        skipped=counters["skipped"],
        errors=counters["errors"],
        rows=results,
    )


if __name__ == "__main__":
    uvicorn.run("main:app", host="0.0.0.0", port=8000, reload=True)