<?php
error_reporting(0);
header('Content-Type: application/json');

$dataDir = __DIR__ . '/data/';
$dataFile = $dataDir . 'feedback.json';

function getAdminPassword() {
    $envVar = getenv('ADMIN_PASSWORD');
    if ($envVar !== false && $envVar !== '') {
        return $envVar;
    }

    $envFile = __DIR__ . '/.env';
    if (file_exists($envFile)) {
        $lines = file($envFile, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
        foreach ($lines as $line) {
            if (strpos(trim($line), '#') === 0) continue;
            $parts = explode('=', $line, 2);
            if (count($parts) === 2) {
                if (trim($parts[0]) === 'ADMIN_PASSWORD') {
                    return trim($parts[1]);
                }
            }
        }
    }
    return '1234';
}
$adminPassword = getAdminPassword();

// Create data directory if not exists
if (!is_dir($dataDir)) {
    @mkdir($dataDir, 0755, true);
}

// Default Seed Data
$defaultFeedback = [
    [
        'id' => 'fb-1',
        'author' => 'Markus T.',
        'type' => 'feature',
        'title' => 'QR-Code Download für Gäste',
        'text' => 'Es wäre super cool, wenn nach der Aufnahme ein QR-Code angezeigt wird, über den sich die Gäste das Foto direkt auf das Handy laden können.',
        'upvotes' => 42,
        'answer' => null
    ],
    [
        'id' => 'fb-2',
        'author' => 'Sabrina',
        'type' => 'love',
        'title' => 'Sticker-Editor ist genial!',
        'text' => 'Unsere Hochzeitsgäste haben stundenlang Emojis und Eventtexte verschoben. Die Bedienung ist wirklich super intuitiv und einfach.',
        'upvotes' => 28,
        'answer' => 'Vielen Dank für das tolle Feedback! Freut uns, dass es euch gefallen hat.'
    ],
    [
        'id' => 'fb-3',
        'author' => 'EventTech GmbH',
        'type' => 'bug',
        'title' => 'Drucker-Timeout bei schlechtem WLAN',
        'text' => 'Manchmal meldet die App einen Fehler, wenn der Drucker im lokalen Netzwerk kurz die Verbindung verliert. Ein automatischer Retry wäre hilfreich.',
        'upvotes' => 15,
        'answer' => null
    ]
];

// Initialize JSON file if it doesn't exist
if (!file_exists($dataFile)) {
    file_put_contents($dataFile, json_encode($defaultFeedback, JSON_PRETTY_PRINT));
}

// Read data
$feedbackData = json_decode(file_get_contents($dataFile), true);
if (!$feedbackData) {
    $feedbackData = [];
}

$action = isset($_GET['action']) ? $_GET['action'] : '';
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    // For POST requests, we might get the action from the body or query param
    $inputJSON = file_get_contents('php://input');
    $input = json_decode($inputJSON, true);
    $action = isset($input['action']) ? $input['action'] : $action;
}

switch ($_SERVER['REQUEST_METHOD']) {
    case 'GET':
        // Return all feedback
        echo json_encode(['success' => true, 'data' => $feedbackData]);
        break;

    case 'POST':
        if (!$input) {
            http_response_code(400);
            echo json_encode(['error' => 'Invalid JSON']);
            exit;
        }

        if ($action === 'add') {
            $newFb = [
                'id' => 'fb-' . time() . rand(100, 999),
                'author' => htmlspecialchars($input['author'] ?? 'Anonym'),
                'type' => htmlspecialchars($input['type'] ?? 'feature'),
                'title' => htmlspecialchars($input['title'] ?? 'Kein Titel'),
                'text' => htmlspecialchars($input['text'] ?? ''),
                'upvotes' => 1,
                'answer' => null
            ];
            
            array_push($feedbackData, $newFb);
            file_put_contents($dataFile, json_encode($feedbackData, JSON_PRETTY_PRINT));
            
            echo json_encode(['success' => true, 'data' => $newFb]);
        } 
        elseif ($action === 'upvote') {
            $id = $input['id'] ?? '';
            $undo = isset($input['undo']) && $input['undo'] === true;
            $found = false;
            
            foreach ($feedbackData as &$item) {
                if ($item['id'] === $id) {
                    if ($undo) {
                        $item['upvotes'] = max(0, $item['upvotes'] - 1);
                    } else {
                        $item['upvotes']++;
                    }
                    $found = true;
                    break;
                }
            }
            
            if ($found) {
                file_put_contents($dataFile, json_encode($feedbackData, JSON_PRETTY_PRINT));
                echo json_encode(['success' => true]);
            } else {
                http_response_code(404);
                echo json_encode(['error' => 'Feedback not found']);
            }
        }
        elseif ($action === 'verify_password') {
            $secret = $input['secret'] ?? '';
            if ($secret === $adminPassword) {
                echo json_encode(['success' => true]);
            } else {
                http_response_code(401);
                echo json_encode(['error' => 'Unauthorized']);
            }
            exit;
        }
        elseif ($action === 'delete') {
            $id = $input['id'] ?? '';
            $secret = $input['secret'] ?? '';
            
            if ($secret !== $adminPassword) {
                http_response_code(401);
                echo json_encode(['error' => 'Unauthorized']);
                exit;
            }
            
            $filteredData = array_filter($feedbackData, function($item) use ($id) {
                return $item['id'] !== $id;
            });
            
            // Re-index array
            $feedbackData = array_values($filteredData);
            file_put_contents($dataFile, json_encode($feedbackData, JSON_PRETTY_PRINT));
            echo json_encode(['success' => true]);
        }
        elseif ($action === 'answer') {
            $id = $input['id'] ?? '';
            $answer = $input['answer'] ?? '';
            $secret = $input['secret'] ?? '';
            
            if ($secret !== $adminPassword) {
                http_response_code(401);
                echo json_encode(['error' => 'Unauthorized']);
                exit;
            }
            
            $found = false;
            foreach ($feedbackData as &$item) {
                if ($item['id'] === $id) {
                    // Save htmlspecialchars to avoid XSS but allow simple answers
                    $item['answer'] = $answer === '' ? null : htmlspecialchars($answer);
                    $found = true;
                    break;
                }
            }
            
            if ($found) {
                file_put_contents($dataFile, json_encode($feedbackData, JSON_PRETTY_PRINT));
                echo json_encode(['success' => true]);
            } else {
                http_response_code(404);
                echo json_encode(['error' => 'Feedback not found']);
            }
        }
        else {
            http_response_code(400);
            echo json_encode(['error' => 'Unknown action']);
        }
        break;

    default:
        http_response_code(405);
        echo json_encode(['error' => 'Method not allowed']);
        break;
}