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

try {
    $pdo = db();
    $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

    // SQL statements for creating tables
    $sql = <<<SQL
        CREATE TABLE IF NOT EXISTS `participants` (
          `id` INT AUTO_INCREMENT PRIMARY KEY,
          `email` VARCHAR(255) NOT NULL UNIQUE,
          `nickname` VARCHAR(255) NOT NULL,
          `created_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

        CREATE TABLE IF NOT EXISTS `questions` (
          `id` INT AUTO_INCREMENT PRIMARY KEY,
          `question_text` TEXT NOT NULL,
          `score` INT NOT NULL DEFAULT 10,
          `image_url` VARCHAR(255) NULL,
          `created_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

        CREATE TABLE IF NOT EXISTS `answers` (
          `id` INT AUTO_INCREMENT PRIMARY KEY,
          `question_id` INT NOT NULL,
          `answer_text` VARCHAR(255) NOT NULL,
          `is_correct` BOOLEAN NOT NULL DEFAULT FALSE,
          `created_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
          FOREIGN KEY (`question_id`) REFERENCES `questions`(`id`) ON DELETE CASCADE
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

        CREATE TABLE IF NOT EXISTS `submissions` (
          `id` INT AUTO_INCREMENT PRIMARY KEY,
          `participant_id` INT NOT NULL,
          `question_id` INT NOT NULL,
          `answer_id` INT NOT NULL,
          `created_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
          FOREIGN KEY (`participant_id`) REFERENCES `participants`(`id`) ON DELETE CASCADE,
          FOREIGN KEY (`question_id`) REFERENCES `questions`(`id`) ON DELETE CASCADE,
          FOREIGN KEY (`answer_id`) REFERENCES `answers`(`id`) ON DELETE CASCADE
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
    SQL;

    $pdo->exec($sql);
    echo "Tabelle create con successo (o già esistenti)." . PHP_EOL;

} catch (PDOException $e) {
    die("Errore nella creazione delle tabelle: " . $e->getMessage());
}