PRAGMA foreign_keys = ON;

CREATE TABLE IF NOT EXISTS users (
  id INTEGER PRIMARY KEY AUTOINCREMENT,
  username TEXT UNIQUE NOT NULL,
  password_hash TEXT NOT NULL,
  created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP
);

CREATE TABLE IF NOT EXISTS videos (
  id INTEGER PRIMARY KEY AUTOINCREMENT,
  title TEXT NOT NULL,
  channel TEXT NOT NULL,
  views INTEGER NOT NULL DEFAULT 0,
  description TEXT,
  duration_seconds INTEGER NOT NULL DEFAULT 0,
  duration_text TEXT NOT NULL,
  category TEXT NOT NULL,
  youtube_id TEXT NOT NULL,
  upload_date TEXT NOT NULL
);

CREATE TABLE IF NOT EXISTS likes (
  user_id INTEGER NOT NULL,
  video_id INTEGER NOT NULL,
  value INTEGER NOT NULL CHECK (value IN (-1, 1)),
  PRIMARY KEY (user_id, video_id),
  FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE,
  FOREIGN KEY (video_id) REFERENCES videos(id) ON DELETE CASCADE
);

CREATE TABLE IF NOT EXISTS watch_later (
  user_id INTEGER NOT NULL,
  video_id INTEGER NOT NULL,
  added_at TEXT NOT NULL,
  PRIMARY KEY (user_id, video_id),
  FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE,
  FOREIGN KEY (video_id) REFERENCES videos(id) ON DELETE CASCADE
);

CREATE TABLE IF NOT EXISTS history (
  user_id INTEGER NOT NULL,
  video_id INTEGER NOT NULL,
  watched_at TEXT NOT NULL,
  PRIMARY KEY (user_id, video_id),
  FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE,
  FOREIGN KEY (video_id) REFERENCES videos(id) ON DELETE CASCADE
);

CREATE TABLE IF NOT EXISTS comments (
  id INTEGER PRIMARY KEY AUTOINCREMENT,
  user_id INTEGER NOT NULL,
  video_id INTEGER NOT NULL,
  content TEXT NOT NULL,
  created_at TEXT NOT NULL,
  FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE,
  FOREIGN KEY (video_id) REFERENCES videos(id) ON DELETE CASCADE
);