<?php
function create_schema() {
    try {
        $pdo = db();
        $sql = "
        CREATE TABLE IF NOT EXISTS users (
            id INT AUTO_INCREMENT PRIMARY KEY,
            username VARCHAR(50) NOT NULL UNIQUE,
            password VARCHAR(255) NOT NULL,
            role ENUM('Admin', 'Tester', 'Developer') NOT NULL,
            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
        );

        CREATE TABLE IF NOT EXISTS test_cases (
            id INT AUTO_INCREMENT PRIMARY KEY,
            title VARCHAR(255) NOT NULL,
            description TEXT,
            precondition TEXT,
            steps_to_execute TEXT,
            expected_result TEXT,
            status ENUM('New', 'Passed', 'Failed', 'Blocked') NOT NULL DEFAULT 'New',
            feature_area VARCHAR(100),
            created_by INT,
            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
            FOREIGN KEY (created_by) REFERENCES users(id)
        );

        CREATE TABLE IF NOT EXISTS bugs (
            id INT AUTO_INCREMENT PRIMARY KEY,
            title VARCHAR(255) NOT NULL,
            description TEXT,
            steps_to_reproduce TEXT,
            status ENUM('New', 'Testing/Tested', 'Verified', 'Closed') NOT NULL DEFAULT 'New',
            test_case_id INT,
            created_by INT,
            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
            FOREIGN KEY (test_case_id) REFERENCES test_cases(id),
            FOREIGN KEY (created_by) REFERENCES users(id)
        );

        CREATE TABLE IF NOT EXISTS comments (
            id INT AUTO_INCREMENT PRIMARY KEY,
            bug_id INT,
            test_case_id INT,
            user_id INT NOT NULL,
            comment TEXT NOT NULL,
            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
            FOREIGN KEY (bug_id) REFERENCES bugs(id),
            FOREIGN KEY (test_case_id) REFERENCES test_cases(id),
            FOREIGN KEY (user_id) REFERENCES users(id)
        );
        ";
        $pdo->exec($sql);
    } catch (PDOException $e) {
        die("DB ERROR: " . $e->getMessage());
    }
}