<?php
require_once __DIR__ . '/config.php';

try {
    // สร้างฐานข้อมูล
    $pdo = new PDO("mysql:host=" . DB_HOST, DB_USER, DB_PASS);
    $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    $pdo->exec("CREATE DATABASE IF NOT EXISTS `" . DB_NAME . "` DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci");
    $pdo->exec("USE `" . DB_NAME . "`");

    // สร้างตาราง
    $pdo->exec("
        CREATE TABLE IF NOT EXISTS curricula (
            id INT AUTO_INCREMENT PRIMARY KEY,
            code VARCHAR(10) NOT NULL UNIQUE,
            name_th VARCHAR(255) NOT NULL,
            name_en VARCHAR(255) NOT NULL,
            total_credits INT NOT NULL,
            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4
    ");

    $pdo->exec("
        CREATE TABLE IF NOT EXISTS course_groups (
            id INT AUTO_INCREMENT PRIMARY KEY,
            curriculum_id INT NOT NULL,
            parent_id INT DEFAULT NULL,
            code VARCHAR(50) NOT NULL,
            name_th VARCHAR(255) NOT NULL,
            min_credits INT NOT NULL DEFAULT 0,
            sort_order INT NOT NULL DEFAULT 0,
            FOREIGN KEY (curriculum_id) REFERENCES curricula(id) ON DELETE CASCADE,
            FOREIGN KEY (parent_id) REFERENCES course_groups(id) ON DELETE CASCADE
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4
    ");

    $pdo->exec("
        CREATE TABLE IF NOT EXISTS courses (
            id INT AUTO_INCREMENT PRIMARY KEY,
            group_id INT NOT NULL,
            code VARCHAR(20) NOT NULL UNIQUE,
            name_th VARCHAR(255) NOT NULL,
            name_en VARCHAR(255) DEFAULT '',
            credits DECIMAL(3,1) NOT NULL,
            lecture_hours INT NOT NULL DEFAULT 0,
            practice_hours INT NOT NULL DEFAULT 0,
            self_study_hours INT NOT NULL DEFAULT 0,
            sort_order INT NOT NULL DEFAULT 0,
            FOREIGN KEY (group_id) REFERENCES course_groups(id) ON DELETE CASCADE
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4
    ");

    $pdo->exec("
        CREATE TABLE IF NOT EXISTS students (
            id INT AUTO_INCREMENT PRIMARY KEY,
            student_code VARCHAR(20) NOT NULL UNIQUE,
            name_th VARCHAR(255) NOT NULL,
            name_en VARCHAR(255) DEFAULT '',
            faculty VARCHAR(255) DEFAULT '',
            graduated_institution VARCHAR(255) DEFAULT '',
            curriculum_id INT NOT NULL,
            enrollment_year INT NOT NULL,
            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
            FOREIGN KEY (curriculum_id) REFERENCES curricula(id)
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4
    ");

    $pdo->exec("
        CREATE TABLE IF NOT EXISTS student_courses (
            id INT AUTO_INCREMENT PRIMARY KEY,
            student_id INT NOT NULL,
            course_id INT DEFAULT NULL,
            course_code VARCHAR(20) NOT NULL,
            course_name_th VARCHAR(255) NOT NULL,
            credits DECIMAL(3,1) NOT NULL,
            lecture_hours INT NOT NULL DEFAULT 0,
            practice_hours INT NOT NULL DEFAULT 0,
            self_study_hours INT NOT NULL DEFAULT 0,
            source_type ENUM('transfer','manual') NOT NULL DEFAULT 'manual',
            source_file VARCHAR(255) DEFAULT NULL,
            notes TEXT DEFAULT NULL,
            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
            FOREIGN KEY (student_id) REFERENCES students(id) ON DELETE CASCADE,
            FOREIGN KEY (course_id) REFERENCES courses(id) ON DELETE SET NULL
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4
    ");

    echo "✅ Database and tables created successfully!\n";

    // ตรวจสอบว่ามีข้อมูลหลักสูตรหรือยัง
    $stmt = $pdo->query("SELECT COUNT(*) FROM curricula");
    if ($stmt->fetchColumn() == 0) {
        echo "⏳ Importing curriculum data...\n";
        require_once __DIR__ . '/import_curriculum.php';
        echo "✅ Curriculum data imported!\n";
    } else {
        echo "ℹ️ Curriculum data already exists, skipping import.\n";
    }

} catch (PDOException $e) {
    die("❌ Error: " . $e->getMessage() . "\n");
}