"""
WhatsApp Cloud API Debug Test Script
=====================================

This script tests WhatsApp message sending with full debugging to identify
why messages return HTTP 200 but are not received by recipients.

Usage:
    python test_whatsapp_debug.py

Target:
    Phone: 0504370045 → 972504370045
    Template: hina_invitation
    Language: he
"""

import asyncio
import sys
import os
import json
import logging
from pathlib import Path

# Add backend to path
sys.path.insert(0, str(Path(__file__).parent))

# Configure detailed logging
logging.basicConfig(
    level=logging.DEBUG,
    format='%(asctime)s - %(name)s - %(levelname)s - %(message)s'
)
logger = logging.getLogger(__name__)

# Load environment variables
from dotenv import load_dotenv
load_dotenv()

from whatsapp import WhatsAppService, WhatsAppError
from database import SessionLocal


async def test_phone_normalization():
    """Test that phone number normalization works correctly"""
    print("\n" + "="*80)
    print("STEP 1: Phone Number Normalization Test")
    print("="*80)
    
    test_numbers = [
        ("0504370045", "+972504370045"),
        ("050-437-0045", "+972504370045"),
        ("+972504370045", "+972504370045"),
        ("972504370045", "+972504370045"),
        ("0506118707", "+972506118707"),
    ]
    
    for input_phone, expected in test_numbers:
        normalized = WhatsAppService.normalize_phone_to_e164(input_phone)
        status = "✓" if normalized == expected else "✗"
        print(f"{status} {input_phone:20} → {normalized:20} (expected: {expected})")
        if normalized != expected:
            print(f"  ERROR: Normalization mismatch!")
            return False
    
    print("\n✓ All phone normalizations correct")
    return True


async def test_template_configuration(db):
    """Test that hina_invitation template is configured correctly"""
    print("\n" + "="*80)
    print("STEP 2: Template Configuration Test")
    print("="*80)
    
    try:
        from whatsapp_templates import get_template
        
        template = get_template(db, "hina_invitation")
        
        print("\nTemplate Configuration:")
        print(f"  meta_name:        {template['meta_name']}")
        print(f"  language_code:    {template['language_code']}")
        print(f"  header_type:      {template.get('header_type', 'TEXT')}")
        print(f"  header_params:    {template.get('header_params', [])}")
        print(f"  header_handle_key:{template.get('header_handle_key', 'N/A')}")
        print(f"  body_params:      {template.get('body_params', [])}")
        print(f"  button_type:      {template.get('button_type', 'N/A')}")
        print(f"  button_url:       {template.get('button_url', 'N/A')}")
        print(f"  button_param_key: {template.get('button_param_key', 'N/A')}")
        
        # Validate template structure
        issues = []
        
        if template.get('meta_name') != 'hina_invitation':
            issues.append("meta_name must be 'hina_invitation'")
        
        if template.get('language_code') != 'he':
            issues.append("language_code must be 'he'")
        
        if template.get('header_type') != 'IMAGE':
            issues.append("header_type should be 'IMAGE' for this template")
        
        if not template.get('header_handle_key'):
            issues.append("header_handle_key should be set for dynamic image")
        
        if template.get('body_params') != ['contact_name']:
            issues.append("body_params should be ['contact_name']")
        
        if template.get('button_param_key') != 'event_id':
            issues.append("button_param_key should be 'event_id'")
        
        if template.get('button_url') != 'https://invy.dvirlabs.com/guest/{{1}}':
            issues.append("button_url should include dynamic parameter {{1}}")
        
        if issues:
            print("\n✗ Template configuration issues found:")
            for issue in issues:
                print(f"  - {issue}")
            return False
        
        print("\n✓ Template configuration is correct")
        return True
    
    except Exception as e:
        print(f"\n✗ Failed to load template: {e}")
        return False


async def test_send_message(db):
    """Send a test WhatsApp message with full logging"""
    print("\n" + "="*80)
    print("STEP 3: Send Test WhatsApp Message")
    print("="*80)
    
    # Test parameters
    target_phone = "0504370045"
    template_key = "hina_invitation"
    
    params = {
        "contact_name": "בדיקה",
        "event_id": "7c170667-9643-48c6-ad95-43cd3a1a36e1",  # חינה event with valid image
        "invitation_image_url": "https://api-invy.dvirlabs.com/uploads/271fe5d87db744ae934337bf91fcd19e.png",
    }
    
    print(f"\nTest Parameters:")
    print(f"  Phone:        {target_phone} → {WhatsAppService.normalize_phone_to_e164(target_phone)}")
    print(f"  Template:     {template_key}")
    print(f"  Language:     he")
    print(f"  Contact Name: {params['contact_name']}")
    print(f"  Event ID:     {params['event_id']}")
    print(f"  Image URL:    {params['invitation_image_url']}")
    
    print(f"\nMeta API Configuration:")
    print(f"  Access Token: {'***' + os.getenv('WHATSAPP_ACCESS_TOKEN', '')[-8:] if os.getenv('WHATSAPP_ACCESS_TOKEN') else 'NOT SET'}")
    print(f"  Phone Number ID: {os.getenv('WHATSAPP_PHONE_NUMBER_ID', 'NOT SET')}")
    print(f"  API Version:  {os.getenv('WHATSAPP_API_VERSION', 'v20.0')}")
    
    if not os.getenv('WHATSAPP_ACCESS_TOKEN') or not os.getenv('WHATSAPP_PHONE_NUMBER_ID'):
        print("\n✗ ERROR: WhatsApp credentials not configured in .env file")
        return False
    
    try:
        service = WhatsAppService(db=db)
        
        print("\n" + "-"*80)
        print("Sending message to Meta WhatsApp Cloud API...")
        print("-"*80)
        
        result = await service.send_by_template_key(
            template_key=template_key,
            to_phone=target_phone,
            params=params,
            event_id=params['event_id'],
            guest_id=None,
        )
        
        print("\n" + "="*80)
        print("✓ MESSAGE SENT SUCCESSFULLY!")
        print("="*80)
        print(f"\nResponse:")
        print(json.dumps(result, indent=2, ensure_ascii=False))
        
        wamid = result.get('message_id', 'N/A')
        print(f"\n✓ WhatsApp Message ID (wamid): {wamid}")
        print(f"✓ Sent to: {result.get('to', 'N/A')}")
        print(f"✓ Template: {result.get('template', 'N/A')}")
        print(f"✓ Status: {result.get('status', 'N/A')}")
        
        print("\n" + "="*80)
        print("IMPORTANT: Check WhatsApp Webhook for Delivery Status")
        print("="*80)
        print("""
The message was accepted by Meta (HTTP 200), but this does NOT mean
it was delivered. To confirm delivery:

1. Configure webhook in Meta Business Manager:
   URL: https://your-domain.com/whatsapp/webhook
   Verify Token: (from WHATSAPP_VERIFY_TOKEN in .env)
   
2. Subscribe to 'messages' webhook events

3. Watch the backend logs for webhook callbacks:
   - Status: 'sent' = Meta accepted
   - Status: 'delivered' = Recipient received
   - Status: 'read' = Recipient opened
   - Status: 'failed' = Delivery failed (check error details)

4. Query the database for message status:
   SELECT * FROM whatsapp_messages WHERE wamid = '{wamid}';

If the message stays in 'sent' status and never reaches 'delivered',
the problem is with Meta's delivery, not your code.

Common reasons for non-delivery:
- Phone number not registered with WhatsApp
- Phone number blocked your business account
- Template not approved or parameters mismatch
- Image URL not accessible to Meta servers
- Rate limiting or business account issues
        """)
        
        return True
    
    except WhatsAppError as e:
        print(f"\n✗ WhatsApp API Error: {e}")
        return False
    except Exception as e:
        print(f"\n✗ Unexpected error: {e}")
        logger.exception("Full traceback:")
        return False


async def check_webhook_configuration():
    """Check if webhook is configured"""
    print("\n" + "="*80)
    print("STEP 4: Webhook Configuration Check")
    print("="*80)
    
    verify_token = os.getenv('WHATSAPP_VERIFY_TOKEN', '')
    
    print(f"\nWebhook Settings:")
    print(f"  Verify Token: {'***' + verify_token[-8:] if verify_token else 'NOT SET'}")
    print(f"  Webhook URL:  https://your-domain.com/whatsapp/webhook")
    
    if not verify_token:
        print("\n⚠ Warning: WHATSAPP_VERIFY_TOKEN not set in .env")
        print("  You need this to verify the webhook with Meta")
    else:
        print("\n✓ Verify token is configured")
    
    print("\nWebhook Endpoints Available:")
    print("  GET  /whatsapp/webhook - Webhook verification")
    print("  POST /whatsapp/webhook - Status updates from Meta")
    
    print("\nTo configure webhook in Meta Business Manager:")
    print("  1. Go to WhatsApp > Configuration > Webhook")
    print("  2. Set Callback URL: https://your-domain.com/whatsapp/webhook")
    print(f"  3. Set Verify Token: {verify_token if verify_token else '(SET THIS IN .env)'}")
    print("  4. Click 'Verify and Save'")
    print("  5. Subscribe to 'messages' webhook field")


async def main():
    """Run all debug tests"""
    print("\n" + "="*80)
    print("WhatsApp Cloud API Debugging Tool")
    print("="*80)
    print("""
This script will:
1. Test phone number normalization
2. Validate template configuration  
3. Send a test message with full logging
4. Show webhook configuration status
    """)
    
    db = SessionLocal()
    try:
        # Run tests
        test1 = await test_phone_normalization()
        test2 = await test_template_configuration(db)
        
        if not (test1 and test2):
            print("\n✗ Pre-flight checks failed. Fix errors above before sending.")
            return
        
        # Ask user to confirm send
        print("\n" + "="*80)
        response = input("Ready to send test message? (yes/no): ").strip().lower()
        if response not in ['yes', 'y']:
            print("Test cancelled.")
            return
        
        test3 = await test_send_message(db)
        await check_webhook_configuration()
        
        print("\n" + "="*80)
        print("Debug Session Complete")
        print("="*80)
        
        if test3:
            print("\n✓ Message sent successfully")
            print("\nNext steps:")
            print("1. Check if recipient received the message on WhatsApp")
            print("2. Watch backend logs for webhook status updates")
            print("3. Query database: SELECT * FROM whatsapp_messages;")
        else:
            print("\n✗ Message send failed - see errors above")
    
    finally:
        db.close()


if __name__ == "__main__":
    asyncio.run(main())