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

function get_db_connection() {
    static $pdo;
    if (!$pdo) {
        try {
            $pdo = new PDO('mysql:host='.DB_HOST.';dbname='.DB_NAME.';charset=utf8mb4', DB_USER, DB_PASS, [
                PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
                PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
            ]);
        } catch (PDOException $e) {
            // In a real app, you'd want to log this and show a user-friendly error.
            die("Database connection failed: " . $e->getMessage());
        }
    }
    return $pdo;
}

function initialize_database() {
    $pdo = get_db_connection();

    $statements = [
        'CREATE TABLE IF NOT EXISTS members (
            id INT AUTO_INCREMENT PRIMARY KEY,
            full_name VARCHAR(255) NOT NULL,
            street VARCHAR(255),
            number VARCHAR(50),
            neighborhood VARCHAR(100),
            city VARCHAR(100),
            state VARCHAR(50),
            zip_code VARCHAR(20),
            phone VARCHAR(50),
            email VARCHAR(255),
            job_title VARCHAR(255),
            department VARCHAR(255),
            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
        );',
        'CREATE TABLE IF NOT EXISTS dependents (
            id INT AUTO_INCREMENT PRIMARY KEY,
            member_id INT NOT NULL,
            full_name VARCHAR(255) NOT NULL,
            relationship VARCHAR(100),
            date_of_birth DATE,
            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
            FOREIGN KEY (member_id) REFERENCES members(id) ON DELETE CASCADE
        );',
        'CREATE TABLE IF NOT EXISTS users (
            id INT AUTO_INCREMENT PRIMARY KEY,
            username VARCHAR(255) NOT NULL UNIQUE,
            password VARCHAR(255) NOT NULL,
            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
        );'
    ];

    foreach ($statements as $statement) {
        $pdo->exec($statement);
    }

    // Add a default admin user if one doesn't exist
    $stmt = $pdo->query("SELECT id FROM users WHERE username = 'admin'");
    if ($stmt->rowCount() == 0) {
        $admin_pass = password_hash('password', PASSWORD_DEFAULT);
        $pdo->prepare("INSERT INTO users (username, password) VALUES (?, ?)")
            ->execute(['admin', $admin_pass]);
    }
}

// Initialize the database schema when this file is included.
initialize_database();