---

-- Включаем поддержку внешних ключей
PRAGMA foreign_keys = ON;

-- 1. Сначала categories (на неё ссылается courses)
CREATE TABLE IF NOT EXISTS categories (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    title TEXT NOT NULL,
    icon TEXT
);

-- 2. Потом courses
CREATE TABLE IF NOT EXISTS courses (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    title TEXT NOT NULL,
    price REAL NOT NULL,
    current_discount REAL DEFAULT 0,
    is_available INTEGER DEFAULT 1,
    category_id INTEGER,
    FOREIGN KEY (category_id) REFERENCES categories(id) ON DELETE SET NULL
);

-- 3. users (не зависит от других таблиц)
CREATE TABLE IF NOT EXISTS users (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    first_name TEXT NOT NULL,
    last_name TEXT NOT NULL,
    email TEXT NOT NULL UNIQUE,
    password TEXT NOT NULL,
    is_admin INTEGER DEFAULT 0,
    is_premium INTEGER DEFAULT 0,
    created_at TEXT DEFAULT (datetime('now'))
);

-- 4. receipts (не зависит от других таблиц)
CREATE TABLE IF NOT EXISTS receipts (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    receipt_url TEXT
);

-- 5. user_courses (последней, т.к. ссылается на все остальные)
CREATE TABLE IF NOT EXISTS user_courses (
    user_id INTEGER NOT NULL,
    course_id INTEGER NOT NULL,
    receipt_id INTEGER,
    created_at TEXT DEFAULT (datetime('now')),
    PRIMARY KEY (user_id, course_id),
    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE,
    FOREIGN KEY (course_id) REFERENCES courses(id) ON DELETE CASCADE,
    FOREIGN KEY (receipt_id) REFERENCES receipts(id) ON DELETE SET NULL
);