<?php
// api/ping.php — Server diagnostics endpoint
// Visit this URL directly in your browser to check if PHP + SQLite are working
// e.g. http://yourdomain.com/chat/api/ping.php

header('Content-Type: application/json');
header('Cache-Control: no-store');
header('Access-Control-Allow-Origin: *');

require_once dirname(__DIR__) . '/bootstrap.php';

$results = [];

// 1. PHP version
$results['php_version'] = PHP_VERSION;
$results['php_ok'] = version_compare(PHP_VERSION, '8.1.0', '>=');

// 2. PDO SQLite
$results['pdo_sqlite'] = extension_loaded('pdo_sqlite');

// 3. ROOT_DIR and config.json
$root = ROOT_DIR;
$configFile = $root . '/config.json';
$results['config_exists'] = file_exists($configFile);
$results['config_writable'] = is_writable($configFile);

if ($results['config_exists']) {
    $raw = file_get_contents($configFile);
    $cfg = json_decode($raw, true);
    $results['config_valid_json'] = ($cfg !== null);
} else {
    $results['config_valid_json'] = false;
}

// 4. db/ directory writable
$dbPath = storagePath((string)getConfigVal('database.main_db', 'db/chat.sqlite'));
$dbDir = dirname($dbPath);
if (!is_dir($dbDir)) {
    @mkdir($dbDir, 0775, true);
}
$results['db_dir_exists']    = is_dir($dbDir);
$results['db_dir_writable']  = is_writable($dbDir);
$results['db_file_writable'] = !is_file($dbPath) || is_writable($dbPath);

// 5. archive/ directory writable
$archiveDir = storagePath((string)getConfigVal('archive.archive_dir', 'archive'));
if (!is_dir($archiveDir)) {
    @mkdir($archiveDir, 0775, true);
}
$results['archive_dir_exists']   = is_dir($archiveDir);
$results['archive_dir_writable'] = is_writable($archiveDir);

// 6. Try creating SQLite DB
$results['sqlite_create'] = false;
$results['sqlite_error']  = null;
if ($results['pdo_sqlite'] && $results['db_dir_writable']) {
    try {
        $testDb = new PDO('sqlite:' . $dbPath);
        $testDb->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
        $testDb->exec('PRAGMA journal_mode=WAL');
        $testDb->exec('CREATE TABLE IF NOT EXISTS _ping_test (id INTEGER PRIMARY KEY)');
        $results['sqlite_create'] = true;
    } catch (Exception $e) {
        $results['sqlite_error'] = $e->getMessage();
    }
}

// 7. Session support
$results['sessions_available'] = function_exists('session_start');

// 8. Overall status
$results['all_ok'] = (
    $results['php_ok'] &&
    $results['pdo_sqlite'] &&
    $results['config_exists'] &&
    $results['config_valid_json'] &&
    $results['db_dir_writable'] &&
    $results['db_file_writable'] &&
    $results['sqlite_create']
);

$results['server_time'] = date('Y-m-d H:i:s T');

http_response_code($results['all_ok'] ? 200 : 500);
echo json_encode($results, JSON_PRETTY_PRINT);