<?php
require_once '../../includes/config.php';
require_once '../../includes/auth.php';
require_once '../../includes/stories.php';

if (!Auth::check()) {
    header('Location: ../login.php');
    exit;
}

$success = '';
$error = '';

try {
    if (!isset($_FILES['importFile']) || $_FILES['importFile']['error'] !== UPLOAD_ERR_OK) {
        throw new Exception('Erreur lors de l\'upload du fichier');
    }

    $overwrite = isset($_POST['overwrite']) && $_POST['overwrite'] === '1';
    $tempDir = sys_get_temp_dir() . '/story_import_' . uniqid();
    mkdir($tempDir);

    // Extraire l'archive
    $zip = new ZipArchive();
    if ($zip->open($_FILES['importFile']['tmp_name']) !== true) {
        throw new Exception('Impossible d\'ouvrir l\'archive ZIP');
    }

    $zip->extractTo($tempDir);
    $zip->close();

    // Vérifier la présence du manifeste
    $manifestFile = $tempDir . '/manifest.json';
    if (!file_exists($manifestFile)) {
        throw new Exception('Archive invalide : manifeste manquant');
    }

    $manifest = json_decode(file_get_contents($manifestFile), true);
    if (!$manifest || !isset($manifest['stories'])) {
        throw new Exception('Manifeste invalide');
    }

    $importedCount = 0;
    $skippedCount = 0;
    $errors = [];

    // Parcourir chaque roman dans le manifeste
    foreach ($manifest['stories'] as $storyInfo) {
        try {
            $storyId = $storyInfo['id'];
            $storyDir = $tempDir . '/' . $storyId;
            
            if (!file_exists($storyDir . '/story.json')) {
                throw new Exception("Fichier story.json manquant pour {$storyInfo['title']}");
            }

            $story = json_decode(file_get_contents($storyDir . '/story.json'), true);
            if (!$story) {
                throw new Exception("Données JSON invalides pour {$storyInfo['title']}");
            }

            // Vérifier si le roman existe déjà
            $existingStory = Stories::get($storyId);
            if ($existingStory && !$overwrite) {
                $skippedCount++;
                continue;
            }

            // Créer les dossiers nécessaires
            $coverDir = __DIR__ . '/../../assets/images/covers/';
            $chaptersImgDir = __DIR__ . '/../../assets/images/chapters/' . $storyId;
            
            if (!file_exists($coverDir)) mkdir($coverDir, 0755, true);
            if (!file_exists($chaptersImgDir)) mkdir($chaptersImgDir, 0755, true);

            // Gérer l'image de couverture
            if (!empty($story['cover'])) {
                $coverFile = $storyDir . '/' . $story['cover'];
                if (file_exists($coverFile)) {
                    $newCoverPath = 'assets/images/covers/' . $storyId . '.' . pathinfo($coverFile, PATHINFO_EXTENSION);
                    copy($coverFile, __DIR__ . '/../../' . $newCoverPath);
                    $story['cover'] = $newCoverPath;
                }
            }

            // Gérer les images des chapitres
            foreach ($story['chapters'] as &$chapter) {
                if (!empty($chapter['content'])) {
                    $content = $chapter['content'];
                    if (is_string($content) && isJson($content)) {
                        $content = json_decode($content, true);
                    }

                    if (is_array($content) && isset($content['ops'])) {
                        foreach ($content['ops'] as &$op) {
                            if (is_array($op['insert']) && isset($op['insert']['image'])) {
                                $imgPath = $storyDir . '/' . $op['insert']['image'];
                                if (file_exists($imgPath)) {
                                    $newImgName = 'image_' . uniqid() . '.' . pathinfo($imgPath, PATHINFO_EXTENSION);
                                    copy($imgPath, $chaptersImgDir . '/' . $newImgName);
                                    $op['insert']['image'] = 'assets/images/chapters/' . $storyId . '/' . $newImgName;
                                }
                            }
                        }
                        $chapter['content'] = json_encode($content);
                    }
                }
            }

            // Sauvegarder le roman
            Stories::save($story);
            $importedCount++;

        } catch (Exception $e) {
            $errors[] = "Erreur pour {$storyInfo['title']}: " . $e->getMessage();
        }
    }

    // Nettoyer
    deleteDir($tempDir);

    // Préparer le message de résultat
    $messages = [];
    if ($importedCount > 0) {
        $messages[] = "$importedCount roman(s) importé(s)";
    }
    if ($skippedCount > 0) {
        $messages[] = "$skippedCount roman(s) ignoré(s) (déjà existants)";
    }
    if (!empty($errors)) {
        $messages[] = "Erreurs : " . implode(", ", $errors);
    }

    $_SESSION['import_result'] = [
        'success' => implode(", ", $messages),
        'error' => !empty($errors) ? implode("\n", $errors) : ''
    ];

    header('Location: ../export-import.php');
    exit;

} catch (Exception $e) {
    if (isset($tempDir) && file_exists($tempDir)) {
        deleteDir($tempDir);
    }
    
    $_SESSION['import_result'] = [
        'error' => 'Erreur lors de l\'import : ' . $e->getMessage()
    ];
    
    header('Location: ../export-import.php');
    exit;
}

// Fonction pour vérifier si une chaîne est du JSON valide
function isJson($string) {
    json_decode($string);
    return json_last_error() === JSON_ERROR_NONE;
}

// Fonction récursive pour supprimer un dossier et son contenu
function deleteDir($dir) {
    if (!file_exists($dir)) return;
    
    $files = new RecursiveIteratorIterator(
        new RecursiveDirectoryIterator($dir, RecursiveDirectoryIterator::SKIP_DOTS),
        RecursiveIteratorIterator::CHILD_FIRST
    );
    
    foreach ($files as $file) {
        if ($file->isDir()) {
            rmdir($file->getRealPath());
        } else {
            unlink($file->getRealPath());
        }
    }
    
    rmdir($dir);
}