-- Add social networking features to recipes database

-- Add visibility column to recipes table
ALTER TABLE recipes 
ADD COLUMN IF NOT EXISTS visibility VARCHAR(20) DEFAULT 'public' CHECK (visibility IN ('public', 'private', 'friends', 'groups'));

-- Create friendships table
CREATE TABLE IF NOT EXISTS friendships (
    id SERIAL PRIMARY KEY,
    user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    friend_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    UNIQUE(user_id, friend_id),
    CHECK (user_id != friend_id)
);

-- Create friend_requests table
CREATE TABLE IF NOT EXISTS friend_requests (
    id SERIAL PRIMARY KEY,
    sender_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    receiver_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    status VARCHAR(20) DEFAULT 'pending' CHECK (status IN ('pending', 'accepted', 'rejected')),
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    UNIQUE(sender_id, receiver_id),
    CHECK (sender_id != receiver_id)
);

-- Create conversations table
CREATE TABLE IF NOT EXISTS conversations (
    id SERIAL PRIMARY KEY,
    name VARCHAR(100),
    is_group BOOLEAN DEFAULT FALSE,
    created_by INTEGER REFERENCES users(id) ON DELETE SET NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

-- Create conversation_members table
CREATE TABLE IF NOT EXISTS conversation_members (
    id SERIAL PRIMARY KEY,
    conversation_id INTEGER NOT NULL REFERENCES conversations(id) ON DELETE CASCADE,
    user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    joined_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    last_read_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    UNIQUE(conversation_id, user_id)
);

-- Create messages table
CREATE TABLE IF NOT EXISTS messages (
    id SERIAL PRIMARY KEY,
    conversation_id INTEGER NOT NULL REFERENCES conversations(id) ON DELETE CASCADE,
    sender_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    content TEXT NOT NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    edited_at TIMESTAMP,
    is_deleted BOOLEAN DEFAULT FALSE
);

-- Create recipe_ratings table
CREATE TABLE IF NOT EXISTS recipe_ratings (
    id SERIAL PRIMARY KEY,
    recipe_id INTEGER NOT NULL REFERENCES recipes(id) ON DELETE CASCADE,
    user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    rating INTEGER NOT NULL CHECK (rating >= 1 AND rating <= 5),
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    UNIQUE(recipe_id, user_id)
);

-- Create recipe_comments table
CREATE TABLE IF NOT EXISTS recipe_comments (
    id SERIAL PRIMARY KEY,
    recipe_id INTEGER NOT NULL REFERENCES recipes(id) ON DELETE CASCADE,
    user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    content TEXT NOT NULL,
    parent_comment_id INTEGER REFERENCES recipe_comments(id) ON DELETE CASCADE,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    is_deleted BOOLEAN DEFAULT FALSE
);

-- Create groups table
CREATE TABLE IF NOT EXISTS groups (
    id SERIAL PRIMARY KEY,
    name VARCHAR(100) NOT NULL,
    description TEXT,
    created_by INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    is_private BOOLEAN DEFAULT FALSE,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

-- Create group_members table
CREATE TABLE IF NOT EXISTS group_members (
    id SERIAL PRIMARY KEY,
    group_id INTEGER NOT NULL REFERENCES groups(id) ON DELETE CASCADE,
    user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    role VARCHAR(20) DEFAULT 'member' CHECK (role IN ('admin', 'moderator', 'member')),
    joined_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    UNIQUE(group_id, user_id)
);

-- Create recipe_shares table (for sharing recipes to specific groups)
CREATE TABLE IF NOT EXISTS recipe_shares (
    id SERIAL PRIMARY KEY,
    recipe_id INTEGER NOT NULL REFERENCES recipes(id) ON DELETE CASCADE,
    group_id INTEGER NOT NULL REFERENCES groups(id) ON DELETE CASCADE,
    shared_by INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    shared_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    UNIQUE(recipe_id, group_id)
);

-- Create indexes for better performance
CREATE INDEX IF NOT EXISTS idx_friendships_user_id ON friendships(user_id);
CREATE INDEX IF NOT EXISTS idx_friendships_friend_id ON friendships(friend_id);
CREATE INDEX IF NOT EXISTS idx_friend_requests_receiver ON friend_requests(receiver_id);
CREATE INDEX IF NOT EXISTS idx_friend_requests_sender ON friend_requests(sender_id);
CREATE INDEX IF NOT EXISTS idx_messages_conversation ON messages(conversation_id);
CREATE INDEX IF NOT EXISTS idx_messages_created_at ON messages(created_at);
CREATE INDEX IF NOT EXISTS idx_conversation_members_user ON conversation_members(user_id);
CREATE INDEX IF NOT EXISTS idx_recipe_ratings_recipe ON recipe_ratings(recipe_id);
CREATE INDEX IF NOT EXISTS idx_recipe_comments_recipe ON recipe_comments(recipe_id);
CREATE INDEX IF NOT EXISTS idx_group_members_user ON group_members(user_id);
CREATE INDEX IF NOT EXISTS idx_group_members_group ON group_members(group_id);
CREATE INDEX IF NOT EXISTS idx_recipe_shares_group ON recipe_shares(group_id);
CREATE INDEX IF NOT EXISTS idx_recipes_visibility ON recipes(visibility);