<?php

/**
 * BOHA Automation - Profile API
 *
 * Allows any authenticated user to update their own profile
 *
 * PUT /api/admin/profile.php - Update own profile
 */

declare(strict_types=1);

require_once dirname(__DIR__) . '/config.php';
require_once dirname(__DIR__) . '/includes/JWTAuth.php';
require_once dirname(__DIR__) . '/includes/AuditLog.php';

// Set headers
setCorsHeaders();
setSecurityHeaders();
setNoCacheHeaders();
header('Content-Type: application/json; charset=utf-8');

// Require authentication
$authData = JWTAuth::requireAuth();
AuditLog::setUser($authData['user_id'], $authData['user']['username'] ?? 'unknown');

$method = $_SERVER['REQUEST_METHOD'];

if ($method !== 'PUT') {
    errorResponse('Metoda není povolena', 405);
}

try {
    $pdo = db();
    $userId = $authData['user_id'];

    // Get existing user
    $stmt = $pdo->prepare('
        SELECT id, username, email, first_name, last_name, role_id, is_active,
               last_login, created_at
        FROM users WHERE id = ?
    ');
    $stmt->execute([$userId]);
    $existingUser = $stmt->fetch();

    if (!$existingUser) {
        errorResponse('Uživatel nebyl nalezen', 404);
    }

    $input = getJsonInput();

    $username = isset($input['username']) ? sanitize($input['username']) : $existingUser['username'];
    $email = isset($input['email']) ? sanitize($input['email']) : $existingUser['email'];
    $firstName = isset($input['first_name']) ? sanitize($input['first_name']) : $existingUser['first_name'];
    $lastName = isset($input['last_name']) ? sanitize($input['last_name']) : $existingUser['last_name'];

    // Validate email format
    if (!isValidEmail($email)) {
        errorResponse('Neplatný formát e-mailu');
    }

    // Check username uniqueness (excluding current user)
    $stmt = $pdo->prepare('SELECT id FROM users WHERE username = ? AND id != ?');
    $stmt->execute([$username, $userId]);
    if ($stmt->fetch()) {
        errorResponse('Uživatelské jméno již existuje');
    }

    // Check email uniqueness (excluding current user)
    $stmt = $pdo->prepare('SELECT id FROM users WHERE email = ? AND id != ?');
    $stmt->execute([$email, $userId]);
    if ($stmt->fetch()) {
        errorResponse('E-mail již existuje');
    }

    // Update user
    if (!empty($input['password'])) {
        // Validate password length
        if (strlen($input['password']) < 8) {
            errorResponse('Heslo musí mít alespoň 8 znaků');
        }

        $passwordHash = password_hash($input['password'], PASSWORD_BCRYPT, ['cost' => BCRYPT_COST]);

        $stmt = $pdo->prepare('
            UPDATE users
            SET username = ?, email = ?, password_hash = ?, first_name = ?, last_name = ?, password_changed_at = NOW()
            WHERE id = ?
        ');
        $stmt->execute([$username, $email, $passwordHash, $firstName, $lastName, $userId]);
    } else {
        $stmt = $pdo->prepare('
            UPDATE users
            SET username = ?, email = ?, first_name = ?, last_name = ?
            WHERE id = ?
        ');
        $stmt->execute([$username, $email, $firstName, $lastName, $userId]);
    }

    // Audit log
    AuditLog::logUpdate('user', $userId, [
        'username' => $existingUser['username'],
        'email' => $existingUser['email'],
        'first_name' => $existingUser['first_name'],
        'last_name' => $existingUser['last_name'],
    ], [
        'username' => $username,
        'email' => $email,
        'first_name' => $firstName,
        'last_name' => $lastName,
    ], 'Uživatel aktualizoval svůj profil');

    successResponse(null, 'Profil byl úspěšně aktualizován');
} catch (PDOException $e) {
    error_log('Profile API error: ' . $e->getMessage());
    errorResponse('Chyba databáze', 500);
}