-- Create database if not exists
CREATE DATABASE IF NOT EXISTS lms_db;
USE lms_db;

-- Create users table
CREATE TABLE IF NOT EXISTS users (
    id INT PRIMARY KEY AUTO_INCREMENT,
    username VARCHAR(50) UNIQUE NOT NULL,
    email VARCHAR(100) UNIQUE NOT NULL,
    password VARCHAR(255) NOT NULL,
    role ENUM('admin', 'student', 'instructor') NOT NULL DEFAULT 'student',
    first_name VARCHAR(50),
    last_name VARCHAR(50),
    profile_image VARCHAR(255),
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
);

-- Create courses table
CREATE TABLE IF NOT EXISTS courses (
    id INT PRIMARY KEY AUTO_INCREMENT,
    title VARCHAR(255) NOT NULL,
    description TEXT,
    course_code VARCHAR(20) UNIQUE,
    instructor_id INT,
    price DECIMAL(10,2) NOT NULL,
    thumbnail VARCHAR(255),
    duration VARCHAR(50),
    level ENUM('beginner', 'intermediate', 'advanced') NOT NULL,
    status ENUM('draft', 'published', 'archived') NOT NULL DEFAULT 'draft',
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    FOREIGN KEY (instructor_id) REFERENCES users(id) ON DELETE SET NULL
);

-- Create lessons table
CREATE TABLE IF NOT EXISTS lessons (
    id INT PRIMARY KEY AUTO_INCREMENT,
    course_id INT NOT NULL,
    title VARCHAR(255) NOT NULL,
    description TEXT,
    content TEXT,
    video_url VARCHAR(255),
    duration VARCHAR(50),
    order_number INT NOT NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    FOREIGN KEY (course_id) REFERENCES courses(id) ON DELETE CASCADE
);

-- Create enrollments table
CREATE TABLE IF NOT EXISTS enrollments (
    id INT PRIMARY KEY AUTO_INCREMENT,
    user_id INT NOT NULL,
    course_id INT NOT NULL,
    enrollment_number VARCHAR(20) UNIQUE,
    status ENUM('active', 'completed', 'dropped') NOT NULL DEFAULT 'active',
    progress INT DEFAULT 0,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE,
    FOREIGN KEY (course_id) REFERENCES courses(id) ON DELETE CASCADE,
    UNIQUE KEY unique_enrollment (user_id, course_id)
);

-- Create payments table
CREATE TABLE IF NOT EXISTS payments (
    id INT PRIMARY KEY AUTO_INCREMENT,
    user_id INT NOT NULL,
    course_id INT NOT NULL,
    amount DECIMAL(10,2) NOT NULL,
    payment_method VARCHAR(50),
    transaction_id VARCHAR(100),
    status ENUM('pending', 'completed', 'failed', 'refunded') NOT NULL DEFAULT 'pending',
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE,
    FOREIGN KEY (course_id) REFERENCES courses(id) ON DELETE CASCADE
);

-- Create assignments table
CREATE TABLE IF NOT EXISTS assignments (
    id INT PRIMARY KEY AUTO_INCREMENT,
    lesson_id INT NOT NULL,
    title VARCHAR(255) NOT NULL,
    description TEXT,
    due_date DATETIME,
    max_score INT DEFAULT 100,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    FOREIGN KEY (lesson_id) REFERENCES lessons(id) ON DELETE CASCADE
);

-- Create submissions table
CREATE TABLE IF NOT EXISTS submissions (
    id INT PRIMARY KEY AUTO_INCREMENT,
    assignment_id INT NOT NULL,
    user_id INT NOT NULL,
    content TEXT,
    file_url VARCHAR(255),
    score INT,
    feedback TEXT,
    submitted_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (assignment_id) REFERENCES assignments(id) ON DELETE CASCADE,
    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
);

-- Create categories table
CREATE TABLE IF NOT EXISTS categories (
    id INT PRIMARY KEY AUTO_INCREMENT,
    name VARCHAR(100) NOT NULL,
    description TEXT,
    parent_id INT,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    FOREIGN KEY (parent_id) REFERENCES categories(id) ON DELETE SET NULL
);

-- Create course_categories table
CREATE TABLE IF NOT EXISTS course_categories (
    course_id INT NOT NULL,
    category_id INT NOT NULL,
    PRIMARY KEY (course_id, category_id),
    FOREIGN KEY (course_id) REFERENCES courses(id) ON DELETE CASCADE,
    FOREIGN KEY (category_id) REFERENCES categories(id) ON DELETE CASCADE
);

-- Create settings table
CREATE TABLE IF NOT EXISTS settings (
    id INT PRIMARY KEY AUTO_INCREMENT,
    setting_key VARCHAR(50) UNIQUE NOT NULL,
    setting_value TEXT,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
);

-- Create slider_images table
CREATE TABLE IF NOT EXISTS slider_images (
    id INT PRIMARY KEY AUTO_INCREMENT,
    title VARCHAR(255) NOT NULL,
    description TEXT,
    image_url VARCHAR(255) NOT NULL,
    link_url VARCHAR(255),
    order_number INT DEFAULT 0,
    status ENUM('active', 'inactive') DEFAULT 'active',
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
);

-- Insert default admin user (password: admin123)
INSERT INTO users (username, email, password, role, first_name, last_name) 
VALUES ('admin', '[email protected]', '$2y$10$92IXUNpkjO0rOQ5byMi.Ye4oKoEa3Ro9llC/.og/at2.uheWG/igi', 'admin', 'Admin', 'User');

-- Insert default settings
INSERT INTO settings (setting_key, setting_value) VALUES
('site_name', 'Learning Management System'),
('site_description', 'A modern learning management system'),
('site_email', '[email protected]'),
('currency', 'USD'),
('currency_symbol', '$'),
('enable_registration', '1'),
('enable_payments', '1'),
('maintenance_mode', '0');