DROP TABLE IF EXISTS attendance, parent_child, users, roles;

CREATE TABLE IF NOT EXISTS roles (
    id INT AUTO_INCREMENT PRIMARY KEY,
    role_name VARCHAR(255) NOT NULL UNIQUE
);

CREATE TABLE IF NOT EXISTS users (
    id INT AUTO_INCREMENT PRIMARY KEY,
    username VARCHAR(255) NOT NULL UNIQUE,
    email VARCHAR(255) NOT NULL UNIQUE,
    password VARCHAR(255) NOT NULL,
    role_id INT,
    first_name VARCHAR(255),
    last_name VARCHAR(255),
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (role_id) REFERENCES roles(id) ON DELETE SET NULL
);

CREATE TABLE IF NOT EXISTS attendance (
    id INT AUTO_INCREMENT PRIMARY KEY,
    student_id INT NOT NULL,
    attendance_date DATE NOT NULL,
    status ENUM('present', 'absent', 'late') NOT NULL,
    FOREIGN KEY (student_id) REFERENCES users(id)
);

CREATE TABLE IF NOT EXISTS parent_child (
    id INT AUTO_INCREMENT PRIMARY KEY,
    parent_id INT NOT NULL,
    child_id INT NOT NULL,
    FOREIGN KEY (parent_id) REFERENCES users(id),
    FOREIGN KEY (child_id) REFERENCES users(id)
);