-- Migration for Social Features: Posts, Comments, Likes

-- Create PostType enum if not exists (simulated with check constraint or text)
-- We'll use TEXT for simplicity as per models.go

CREATE TABLE IF NOT EXISTS posts (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    content TEXT,
    type VARCHAR(50) DEFAULT 'status',
    
    track_id UUID REFERENCES tracks(id) ON DELETE SET NULL,
    playlist_id UUID REFERENCES playlists(id) ON DELETE SET NULL,
    
    like_count INT DEFAULT 0,
    comment_count INT DEFAULT 0,
    
    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
    updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
    deleted_at TIMESTAMP WITH TIME ZONE
);

CREATE INDEX IF NOT EXISTS idx_posts_user_id ON posts(user_id);
CREATE INDEX IF NOT EXISTS idx_posts_deleted_at ON posts(deleted_at);
CREATE INDEX IF NOT EXISTS idx_posts_created_at ON posts(created_at DESC);

-- Comments
CREATE TABLE IF NOT EXISTS comments (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    target_id UUID NOT NULL,
    target_type VARCHAR(50) NOT NULL,
    content TEXT NOT NULL,
    
    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
    updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
    deleted_at TIMESTAMP WITH TIME ZONE
);

CREATE INDEX IF NOT EXISTS idx_comments_user_id ON comments(user_id);
CREATE INDEX IF NOT EXISTS idx_comments_target ON comments(target_type, target_id);
CREATE INDEX IF NOT EXISTS idx_comments_deleted_at ON comments(deleted_at);

-- Likes
CREATE TABLE IF NOT EXISTS likes (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    target_id UUID NOT NULL,
    target_type VARCHAR(50) NOT NULL,
    
    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
    
    UNIQUE(user_id, target_id, target_type)
);

CREATE INDEX IF NOT EXISTS idx_likes_user_id ON likes(user_id);
CREATE INDEX IF NOT EXISTS idx_likes_target ON likes(target_type, target_id);