<?php
// CSV Import page for Post-ERG thesis database
// This page allows importing thesis data from CSV files

session_start();

// Generate CSRF token
if (empty($_SESSION['csrf_token'])) {
    $_SESSION['csrf_token'] = bin2hex(random_bytes(32));
}

require_once __DIR__ . '/../../shared/Database.php';

$message = '';
$errors = [];
$importedCount = 0;
$skippedCount = 0;
$importResults = [];

// Handle CSV upload and import
if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_FILES['csv_file'])) {
    // Verify CSRF token
    if (!isset($_POST['csrf_token']) || !hash_equals($_SESSION['csrf_token'], $_POST['csrf_token'])) {
        $errors[] = "Erreur de sécurité : token invalide.";
    } else {
        try {
            $db = new Database();
            $pdo = $db->getPDO();

            // Check file upload
            if ($_FILES['csv_file']['error'] !== UPLOAD_ERR_OK) {
                throw new Exception("Erreur lors du téléversement du fichier.");
            }

            // Read CSV file
            $csvFile = $_FILES['csv_file']['tmp_name'];
            $handle = fopen($csvFile, 'r');

            if (!$handle) {
                throw new Exception("Impossible d'ouvrir le fichier CSV.");
            }

            // Skip first two rows (empty and headers)
            fgetcsv($handle); // Empty row
            $headers = fgetcsv($handle); // Header row
            fgetcsv($handle); // Description row
            $headers = fgetcsv($handle); // Actual column names

            // Map CSV columns
            $columnMap = [
                0 => 'identifier',      // Identifiant
                1 => 'title',           // Titre
                2 => 'subtitle',        // Sous-titre
                3 => 'authors',         // Auteur·ice(s)
                4 => 'contact',         // Contact
                5 => 'supervisors',     // Promoteur·ice(s)
                6 => 'formats',         // Format
                7 => 'year',            // Année
                8 => 'ap',              // AP
                9 => 'orientation',     // Orientation
                10 => 'finality',       // Finalité
                11 => 'keywords',       // Mots-clés
                12 => 'synopsis',       // Synopsis
                13 => 'context',        // Contexte
                14 => 'remarks',        // Remarques
                15 => 'language',       // Langue
                16 => 'access',         // Autorisation
                17 => 'license',        // License
                18 => 'size_info',      // taille
                19 => 'jury_points',    // Points sur 20
                20 => 'baiu_link',      // lien BAIU
            ];

            // Orientation abbreviation mapping
            $orientationMap = [
                'SC' => 'Sculpture',
                'VI' => 'Vidéographie',
                'CA' => 'Cinéma d\'animation',
                'IP' => 'Installation-Performance',
                'PE' => 'Peinture',
                'PH' => 'Photographie',
                'DE' => 'Dessin',
                'AN' => 'Arts Numériques',
                'GR' => 'Graphisme',
                'TY' => 'Typographie',
                'DN' => 'Design Numérique',
                'IL' => 'Illustration',
                'BD' => 'Bande-Dessinée',
                'SE' => 'Sérigraphie',
                'GV' => 'Gravure',
            ];

            // Process each row
            $lineNumber = 5; // Start after headers
            while (($row = fgetcsv($handle)) !== false) {
                $lineNumber++;

                // Skip empty rows
                if (empty($row[0]) && empty($row[1])) {
                    continue;
                }

                try {
                    $db->beginTransaction();

                    // Extract data
                    $identifier = trim($row[0] ?? '');
                    $title = trim($row[1] ?? '');
                    $subtitle = trim($row[2] ?? '');
                    $authorsRaw = trim($row[3] ?? '');
                    $contact = trim($row[4] ?? '');
                    $supervisorsRaw = trim($row[5] ?? '');
                    $formatsRaw = trim($row[6] ?? '');
                    $year = intval($row[7] ?? 0);
                    $apCode = trim($row[8] ?? '');
                    $orientationCode = trim($row[9] ?? '');
                    $finalityName = trim($row[10] ?? '');
                    $keywordsRaw = trim($row[11] ?? '');
                    $synopsis = trim($row[12] ?? '');
                    $context = trim($row[13] ?? '');
                    $remarks = trim($row[14] ?? '');
                    $languageRaw = trim($row[15] ?? '');
                    $access = trim($row[16] ?? '');
                    $license = trim($row[17] ?? '');
                    $sizeInfo = trim($row[18] ?? '');
                    $juryPoints = !empty($row[19]) ? floatval($row[19]) : null;
                    $baiuLink = trim($row[20] ?? '');

                    // Validate required fields
                    if (empty($title) || empty($year)) {
                        throw new Exception("Ligne $lineNumber: Titre et année requis.");
                    }

                    // Map orientation
                    $orientationName = isset($orientationMap[$orientationCode]) ? $orientationMap[$orientationCode] : null;
                    $orientationId = null;
                    if ($orientationName) {
                        $orientationId = $db->getOrientationId($orientationName);
                    }

                    // Map AP program
                    $apProgramId = null;
                    if (!empty($apCode)) {
                        $stmt = $pdo->prepare("SELECT id FROM ap_programs WHERE code = ?");
                        $stmt->execute([$apCode]);
                        $result = $stmt->fetch();
                        if ($result) {
                            $apProgramId = $result['id'];
                        }
                    }

                    // Map finality
                    $finalityId = null;
                    if (!empty($finalityName)) {
                        $finalityId = $db->getFinalityId($finalityName);
                    }

                    // Insert thesis
                    $stmt = $pdo->prepare("
                        INSERT INTO theses (
                            identifier, title, subtitle, year,
                            orientation_id, ap_program_id, finality_id,
                            synopsis, context_note, remarks,
                            file_size_info, jury_points, baiu_link,
                            submitted_at
                        ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, CURRENT_TIMESTAMP)
                    ");

                    $stmt->execute([
                        !empty($identifier) ? $identifier : null,
                        $title,
                        !empty($subtitle) ? $subtitle : null,
                        $year,
                        $orientationId,
                        $apProgramId,
                        $finalityId,
                        !empty($synopsis) ? $synopsis : null,
                        !empty($context) ? $context : null,
                        !empty($remarks) ? $remarks : null,
                        !empty($sizeInfo) ? $sizeInfo : null,
                        $juryPoints,
                        !empty($baiuLink) ? $baiuLink : null
                    ]);

                    $thesisId = $pdo->lastInsertId();

                    // Add authors
                    if (!empty($authorsRaw)) {
                        $authors = array_map('trim', explode(',', $authorsRaw));
                        foreach ($authors as $index => $authorName) {
                            if (!empty($authorName)) {
                                $authorId = $db->findOrCreateAuthor($authorName, $index === 0 ? $contact : null);
                                $stmt = $pdo->prepare("INSERT INTO thesis_authors (thesis_id, author_id, author_order) VALUES (?, ?, ?)");
                                $stmt->execute([$thesisId, $authorId, $index + 1]);
                            }
                        }
                    }

                    // Add supervisors
                    if (!empty($supervisorsRaw)) {
                        $supervisors = array_map('trim', explode(',', $supervisorsRaw));
                        foreach ($supervisors as $index => $supervisorName) {
                            if (!empty($supervisorName)) {
                                $supervisorId = $db->findOrCreateSupervisor($supervisorName);
                                $stmt = $pdo->prepare("INSERT INTO thesis_supervisors (thesis_id, supervisor_id, supervisor_order) VALUES (?, ?, ?)");
                                $stmt->execute([$thesisId, $supervisorId, $index + 1]);
                            }
                        }
                    }

                    // Add keywords
                    if (!empty($keywordsRaw)) {
                        $keywords = array_map('trim', explode(',', $keywordsRaw));
                        $keywords = array_slice($keywords, 0, 10); // Max 10
                        foreach ($keywords as $keyword) {
                            if (!empty($keyword)) {
                                $keywordId = $db->findOrCreateKeyword($keyword);
                                if ($keywordId) {
                                    $stmt = $pdo->prepare("INSERT INTO thesis_keywords (thesis_id, keyword_id) VALUES (?, ?)");
                                    $stmt->execute([$thesisId, $keywordId]);
                                }
                            }
                        }
                    }

                    // Add language
                    if (!empty($languageRaw)) {
                        $languageId = $db->getLanguageId(ucfirst(strtolower($languageRaw)));
                        if ($languageId) {
                            $stmt = $pdo->prepare("INSERT INTO thesis_languages (thesis_id, language_id) VALUES (?, ?)");
                            $stmt->execute([$thesisId, $languageId]);
                        }
                    }

                    // Add formats
                    if (!empty($formatsRaw)) {
                        $formats = array_map('trim', explode(',', $formatsRaw));
                        foreach ($formats as $formatName) {
                            if (!empty($formatName)) {
                                $formatId = $db->getFormatId(ucfirst(strtolower($formatName)));
                                if ($formatId) {
                                    $stmt = $pdo->prepare("INSERT INTO thesis_formats (thesis_id, format_id) VALUES (?, ?)");
                                    $stmt->execute([$thesisId, $formatId]);
                                }
                            }
                        }
                    }

                    $db->commit();
                    $importedCount++;
                    $importResults[] = "✓ Ligne $lineNumber: \"$title\" importé (ID: $thesisId)";

                } catch (Exception $e) {
                    $db->rollback();
                    $skippedCount++;
                    $importResults[] = "✗ Ligne $lineNumber: " . $e->getMessage();
                    error_log("Import error on line $lineNumber: " . $e->getMessage());
                }
            }

            fclose($handle);

            $message = "Import terminé : $importedCount TFE importés, $skippedCount ignorés.";

        } catch (Exception $e) {
            $errors[] = $e->getMessage();
            error_log("CSV import error: " . $e->getMessage());
        }
    }

    // Regenerate CSRF token
    $_SESSION['csrf_token'] = bin2hex(random_bytes(32));
}
?>
<!DOCTYPE html>
<html lang="fr">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Import CSV - Post-ERG</title>
    <link rel="stylesheet" href="assets/normalize.css">
    <link rel="stylesheet" href="https://raw.githack.com/waldyrious/downstyler/master/downstyler.css" />
    <link rel="shortcut icon" href="assets/icon.svg" type="image/svg">
</head>
<body>
    <header>
        <h1>Import CSV - Post-ERG</h1>
        <nav>
            <a href="index.php">← Nouveau TFE</a> |
            <a href="list.php">📋 Liste des TFE</a>
        </nav>
    </header>

    <main>
        <h2>Importer des TFE depuis un fichier CSV</h2>

        <?php if (!empty($errors)): ?>
            <div style="background: #fee; border: 2px solid #c00; padding: 1rem; margin-bottom: 1rem; border-radius: 4px; color: #c00;">
                <strong>⚠️ Erreurs:</strong>
                <ul>
                    <?php foreach ($errors as $error): ?>
                        <li><?php echo htmlspecialchars($error); ?></li>
                    <?php endforeach; ?>
                </ul>
            </div>
        <?php endif; ?>

        <?php if ($message): ?>
            <div style="background: #efe; border: 2px solid #0a0; padding: 1rem; margin-bottom: 1rem; border-radius: 4px; color: #0a0;">
                <strong>✓ <?php echo htmlspecialchars($message); ?></strong>
            </div>
        <?php endif; ?>

        <form action="import.php" method="post" enctype="multipart/form-data">
            <input type="hidden" name="csrf_token" value="<?php echo htmlspecialchars($_SESSION['csrf_token']); ?>">

            <fieldset>
                <legend>Sélectionner un fichier CSV</legend>

                <p><strong>Format attendu:</strong></p>
                <ul>
                    <li>Colonnes: Identifiant, Titre, Sous-titre, Auteur·ice(s), Contact, Promoteur·ice(s), Format, Année, AP, Orientation, Finalité, Mots-clés, Synopsis, Contexte, Remarques, Langue, Autorisation, License, taille, Points sur 20, lien BAIU</li>
                    <li>Les deux premières lignes seront ignorées (entête)</li>
                    <li>Séparateur: virgule</li>
                    <li>Encodage: UTF-8</li>
                </ul>

                <label for="csv_file">Fichier CSV:</label>
                <input type="file" id="csv_file" name="csv_file" accept=".csv" required>

                <button type="submit">Importer</button>
            </fieldset>
        </form>

        <?php if (!empty($importResults)): ?>
            <h3>Résultats de l'import</h3>
            <div style="background: #f5f5f5; padding: 1rem; border-radius: 4px; max-height: 400px; overflow-y: auto;">
                <pre style="margin: 0; font-size: 0.9em;"><?php
                    foreach ($importResults as $result) {
                        echo htmlspecialchars($result) . "\n";
                    }
                ?></pre>
            </div>
        <?php endif; ?>

        <hr>

        <h3>Notes importantes</h3>
        <ul>
            <li><strong>Codes orientation:</strong> SC (Sculpture), VI (Vidéographie), CA (Cinéma d'animation), IP (Installation-Performance), etc.</li>
            <li><strong>Codes AP:</strong> DPM, LIENS, APS (comme dans la base)</li>
            <li><strong>Auteurs multiples:</strong> Séparer par des virgules</li>
            <li><strong>Mots-clés:</strong> Maximum 10, séparés par des virgules</li>
            <li><strong>Formats:</strong> Séparer par des virgules</li>
            <li>Les lignes avec erreurs seront ignorées et loggées</li>
        </ul>

        <h3>Exemple de fichier CSV</h3>
        <p>Voir: <code>../db/Database_TFE_test.csv</code></p>
    </main>

    <footer>
        <p>Import CSV - Post-ERG Database</p>
    </footer>
</body>
</html>