<?php
require_once __DIR__ . '/../core/security.php';
require_once __DIR__ . '/../core/logger.php';
$pdo    = require __DIR__ . '/../core/db.php';
require_once __DIR__ . '/../models/Paste.php';
require_once __DIR__ . '/../models/Analytics.php';
$config = require __DIR__ . '/../config/config.php';

$logger    = new Logger('save');
$analytics = new Analytics($pdo);

if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
    $logger->warning('Non-POST request to save endpoint', ['method' => $_SERVER['REQUEST_METHOD']]);
    header('Location: /');
    exit;
}

$text     = trim($_POST['text'] ?? '');
$password = $_POST['password'] ?? '';
$expire   = isset($_POST['expire']) ? (int)$_POST['expire'] : 0;

if ($text === '') {
    $logger->warning('Empty paste submission attempt');
    $analytics->record('paste_validation_failed', null, ['reason' => 'empty_text']);
    jsonResponse(['success' => false, 'message' => 'Text cannot be empty.'], 422);
}

$id            = generateId();
$enc           = encryptText($text, $config['app']['master_key']);
$password_hash = $password !== '' ? password_hash($password, PASSWORD_DEFAULT) : null;
$expire_time   = $expire > 0 ? time() + $expire : null;

$paste = new Paste($pdo);
$saved = $paste->save($id, $enc['cipher'], $enc['iv'], $expire_time, $password_hash);

if (!$saved) {
    $logger->error('Failed to save paste to storage', ['id' => $id]);
    $analytics->record('paste_save_failed', $id);
    jsonResponse(['success' => false, 'message' => 'Failed to save paste. Please try again.'], 500);
}

$charCount = mb_strlen($text, 'UTF-8');
$logger->info('Paste created', [
    'id'           => $id,
    'char_count'   => $charCount,
    'has_password' => $password_hash !== null,
    'expires_in'   => $expire > 0 ? "{$expire}s" : 'never',
]);

$analytics->record('paste_created', $id, [
    'char_count'   => $charCount,
    'has_password' => $password_hash !== null,
    'expire_secs'  => $expire > 0 ? $expire : null,
    'storage'      => $expire_time !== null ? 'redis' : 'mysql',
]);

$base = rtrim($config['app']['base_url'] ?: ('http' . (isset($_SERVER['HTTPS']) ? 's' : '') . '://' . $_SERVER['HTTP_HOST']), '/');
$url  = $base . '/view/' . $id;

jsonResponse(['success' => true, 'url' => $url]);