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

CREATE TABLE IF NOT EXISTS session (
    id TEXT PRIMARY KEY,
    user_id TEXT NOT NULL REFERENCES user(id) ON DELETE CASCADE,
    expires_at DATETIME NOT NULL,
    created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP
);

CREATE TABLE IF NOT EXISTS account (
    id TEXT PRIMARY KEY,
    user_id TEXT NOT NULL REFERENCES user(id) ON DELETE CASCADE,
    provider TEXT NOT NULL,
    provider_account_id TEXT NOT NULL,
    created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
    UNIQUE(provider, provider_account_id)
);

CREATE TABLE IF NOT EXISTS anime (
    id INTEGER PRIMARY KEY, -- Jikan ID
    title TEXT NOT NULL,
    image_url TEXT NOT NULL,
    created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP
);

CREATE TABLE IF NOT EXISTS watch_list_entry (
    id TEXT PRIMARY KEY,
    user_id TEXT NOT NULL REFERENCES user(id) ON DELETE CASCADE,
    anime_id INTEGER NOT NULL REFERENCES anime(id) ON DELETE CASCADE,
    status TEXT NOT NULL CHECK(status IN ('watching', 'completed', 'on_hold', 'dropped', 'plan_to_watch')),
    created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
    UNIQUE(user_id, anime_id)
);