<?php
declare(strict_types=1);
require_once __DIR__ . '/includes/app.php';

function completion_certificate_date_label(string $date): string
{
    if ($date === '' || strtotime($date) === false) {
        return date('Y/m/d');
    }

    return date('Y/m/d', strtotime($date));
}

function completion_certificate_decimal_value(float $value): string
{
    return rtrim(rtrim(number_format($value, 2, '.', ''), '0'), '.');
}

function completion_certificate_message_text(string $template, array $tokens, string $fallback): string
{
    $message = trim($template);
    if ($message === '') {
        $message = $fallback;
    }

    return strtr($message, $tokens);
}

function completion_certificate_view_model(array $application, array $settings, int $cycleId, string $cycleLabel, int $studentId): ?array
{
    $certificate = school_student_certificate_summary((int) $application['id'], $cycleId, $studentId);
    $student = is_array($certificate['student'] ?? null) ? $certificate['student'] : null;
    if ($student === null) {
        return null;
    }

    $performance = $certificate['performance'] ?? student_certificate_performance_meta(0.0);
    $hasResults = !empty($certificate['has_results']);
    $honor = $hasResults
        ? student_completion_certificate_honor_meta((float) ($certificate['overall_percentage'] ?? 0))
        : [
            'key' => 'completion',
            'title' => 'Successful Completion',
            'title_ar' => 'إتمام ناجح',
            'completion_line_ar' => 'أتمّ/أتمّت الدورة بنجاح واستفاد/استفادت من محتواها العلمي.',
        ];

    $template = (string) ($settings['completion_certificate_template'] ?? 'modern');
    if (!in_array($template, ['modern', 'classic'], true)) {
        $template = 'modern';
    }

    $centerName = trim((string) ($application['center_name'] ?? ''));
    if ($centerName === '') {
        $centerName = (string) ($settings['app_name'] ?? project_name());
    }

    $centerLogo = trim((string) ($application['logo'] ?? ''));
    if ($centerLogo === '') {
        $centerLogo = trim((string) ($settings['app_logo'] ?? ''));
    }

    $tagline = trim((string) ($settings['completion_certificate_tagline'] ?? ''));
    if ($tagline === '') {
        $tagline = 'شهادة إتمام وتكريم';
    }

    $overallPercentage = (float) ($certificate['overall_percentage'] ?? 0);
    $percentageLabel = $hasResults ? completion_certificate_decimal_value($overallPercentage) . '%' : '—';
    $fallbackMessage = sprintf(
        'تشهد إدارة %s بأن الطالب/الطالبة %s قد أتمّ/أتمّت متطلبات %s %s.',
        $centerName,
        (string) ($student['full_name'] ?? 'الطالب/الطالبة'),
        $cycleLabel,
        $honor['title_ar']
    );

    $bodyMessage = completion_certificate_message_text(
        (string) ($settings['completion_certificate_message'] ?? ''),
        [
            '{student}' => (string) ($student['full_name'] ?? ''),
            '{center}' => $centerName,
            '{cycle}' => $cycleLabel,
            '{performance}' => (string) ($performance['label_ar'] ?? 'مميز'),
            '{honor}' => (string) ($honor['title_ar'] ?? 'بنجاح'),
            '{percentage}' => $hasResults ? completion_certificate_decimal_value($overallPercentage) : '0',
        ],
        $fallbackMessage
    );

    return [
        'certificate' => $certificate,
        'student' => $student,
        'performance' => $performance,
        'has_results' => $hasResults,
        'honor' => $honor,
        'template' => $template,
        'center_name' => $centerName,
        'center_logo' => $centerLogo,
        'tagline' => $tagline,
        'percentage_label' => $percentageLabel,
        'body_message' => $bodyMessage,
        'issue_date_label' => completion_certificate_date_label((string) ($certificate['latest_assessed_on'] ?? '')),
    ];
}

$flash = consume_flash();
$settings = get_app_settings();
$applicationId = filter_input(INPUT_GET, 'id', FILTER_VALIDATE_INT) ?: 0;
$requestedCycleId = filter_input(INPUT_GET, 'cycle', FILTER_VALIDATE_INT) ?: 0;
$autoprint = filter_input(INPUT_GET, 'autoprint', FILTER_VALIDATE_INT) ?: 0;
$search = clean_text($_GET['search'] ?? '', 255);
$filters = [
    'gender' => clean_text($_GET['gender'] ?? '', 50),
    'grade_level' => clean_text($_GET['grade_level'] ?? '', 50),
    'enrollment_status' => clean_text($_GET['enrollment_status'] ?? '', 50),
];

$application = $applicationId > 0 ? get_application($applicationId) : null;
$isApprovedSchool = $application && (string) $application['status'] === 'approved';
$cycleContext = ['cycles' => [], 'selected' => null, 'active' => null, 'read_only' => false];
$selectedCycle = null;
$selectedCycleId = 0;
$cycleLabel = 'الدورة الحالية';
$certificateItems = [];

if ($application && $isApprovedSchool) {
    $cycleContext = resolve_school_cycle_context((int) $application['id'], $application, $requestedCycleId);
    $selectedCycle = $cycleContext['selected'];
    $selectedCycleId = $selectedCycle ? (int) ($selectedCycle['id'] ?? 0) : 0;
    $cycleLabel = $selectedCycle ? (string) ($selectedCycle['cycle_name'] ?? 'الدورة الحالية') : $cycleLabel;

    if ($selectedCycleId > 0) {
        $students = list_school_students_by_cycle((int) $application['id'], $selectedCycleId, $search, 0, 0, $filters);
        foreach ($students as $studentRow) {
            $viewModel = completion_certificate_view_model($application, $settings, $selectedCycleId, $cycleLabel, (int) ($studentRow['id'] ?? 0));
            if ($viewModel !== null) {
                $certificateItems[] = $viewModel;
            }
        }
    }
}

if (!$application || !$isApprovedSchool || $selectedCycleId <= 0) {
    http_response_code(404);
}

$studentsUrl = $application ? school_page_url('students.php', (int) $application['id'], $selectedCycleId) : 'students.php';
$pageTitle = $application ? 'تنزيل شهادات الإتمام: ' . (string) ($application['center_name'] ?? '') : 'تنزيل شهادات الإتمام';
$pageDescription = 'صفحة مجمعة لطباعة أو حفظ جميع شهادات الإتمام والتكريم كملف PDF واحد للمركز والدورة المختارة.';

render_page_start($pageTitle, 'approved', $pageDescription);
render_flash($flash);
?>
<section class="student-certificate-page completion-certificate-page completion-batch-page py-4 py-lg-5">
  <div class="container-xl">
    <div class="certificate-toolbar">
      <div>
        <div class="section-title">جميع شهادات الإتمام والتكريم</div>
        <div class="section-subtle"><?= e((string) count($certificateItems)) ?> شهادة<?= $search !== '' ? ' — نتائج البحث الحالية' : '' ?>. سيتم فتح نافذة الطباعة لتتمكن من الحفظ كملف PDF واحد.</div>
      </div>
      <div class="certificate-toolbar-actions">
        <a class="btn btn-outline-secondary" href="<?= e($studentsUrl) ?>">العودة إلى الطلاب</a>
        <?php if ($certificateItems !== []): ?>
          <button type="button" class="btn btn-primary" onclick="window.print()">تنزيل PDF / طباعة</button>
        <?php endif; ?>
      </div>
    </div>

    <?php if (!$application): ?>
      <div class="app-card text-center py-5">
        <div class="empty-title mb-2">المركز غير موجود</div>
        <p class="text-muted mb-3">تحقق من الرابط ثم أعد المحاولة من صفحة الطلاب.</p>
        <a class="btn btn-primary" href="applications.php?status=approved">المراكز المعتمدة</a>
      </div>
    <?php elseif (!$isApprovedSchool): ?>
      <div class="app-card text-center py-5">
        <div class="empty-title mb-2">الشهادات غير متاحة حالياً</div>
        <p class="text-muted mb-0">يمكن إصدار شهادات الإتمام للمراكز المعتمدة فقط.</p>
      </div>
    <?php elseif ($selectedCycleId <= 0): ?>
      <div class="app-card text-center py-5">
        <div class="empty-title mb-2">لا توجد دورة مختارة</div>
        <p class="text-muted mb-3">اختر دورة صحيحة من صفحة الطلاب ثم أعد فتح تنزيل الشهادات.</p>
        <a class="btn btn-primary" href="<?= e($studentsUrl) ?>">العودة إلى سجل الطلاب</a>
      </div>
    <?php elseif ($certificateItems === []): ?>
      <div class="app-card text-center py-5">
        <div class="empty-title mb-2">لا توجد شهادات مطابقة حالياً</div>
        <p class="text-muted mb-3">قد تكون الفلاتر الحالية لا تُظهر أي طالب، أو لا توجد سجلات في هذه الدورة بعد.</p>
        <a class="btn btn-primary" href="<?= e($studentsUrl) ?>">العودة إلى سجل الطلاب</a>
      </div>
    <?php else: ?>
      <div class="batch-certificate-stack">
        <?php foreach ($certificateItems as $item): ?>
          <?php
            $student = $item['student'];
            $certificate = $item['certificate'];
            $performance = $item['performance'];
            $honor = $item['honor'];
          ?>
          <article class="completion-certificate-card completion-batch-item completion-template-<?= e((string) $item['template']) ?>" aria-labelledby="completion-certificate-title-<?= e((string) ($student['id'] ?? 0)) ?>">
            <div class="completion-certificate-layer completion-certificate-layer-one" aria-hidden="true"></div>
            <div class="completion-certificate-layer completion-certificate-layer-two" aria-hidden="true"></div>

            <div class="completion-certificate-inner">
              <header class="completion-certificate-header">
                <div class="completion-branding">
                  <?php if ((string) $item['center_logo'] !== ''): ?>
                    <img src="<?= e(asset_url((string) $item['center_logo'])) ?>" alt="شعار <?= e((string) $item['center_name']) ?>" class="completion-brand-logo" width="96" height="96">
                  <?php else: ?>
                    <div class="completion-brand-logo completion-brand-badge" aria-hidden="true"><?= e(mb_substr((string) $item['center_name'], 0, 1)) ?></div>
                  <?php endif; ?>
                  <div>
                    <div class="completion-overline">Certificate of Completion</div>
                    <h1 id="completion-certificate-title-<?= e((string) ($student['id'] ?? 0)) ?>" class="completion-certificate-title"><?= e((string) $item['tagline']) ?></h1>
                    <p class="completion-certificate-center mb-0"><?= e((string) $item['center_name']) ?></p>
                  </div>
                </div>
                <div class="completion-certificate-stamps">
                  <span class="completion-stamp"><?= e($cycleLabel) ?></span>
                  <span class="completion-stamp completion-stamp-accent"><?= e((string) ($honor['title_ar'] ?? 'بنجاح')) ?></span>
                </div>
              </header>

              <div class="completion-certificate-content">
                <p class="completion-intro mb-2">تُمنح هذه الشهادة إلى</p>
                <div class="completion-student-name"><?= e((string) ($student['full_name'] ?? '')) ?></div>
                <?php if (!empty($student['student_code'])): ?>
                  <div class="completion-student-code">رقم الطالب: <?= e((string) $student['student_code']) ?></div>
                <?php endif; ?>

                <p class="completion-message"><?= e((string) $item['body_message']) ?></p>
                <p class="completion-honor-line mb-0"><?= e((string) ($honor['completion_line_ar'] ?? '')) ?></p>
              </div>

              <div class="completion-certificate-grid">
                <section class="completion-summary-card">
                  <span class="completion-summary-label">التقدير النهائي</span>
                  <div class="performance-pill performance-<?= e((string) ($performance['key'] ?? 'good')) ?> completion-performance-pill">
                    <?= e((string) ($performance['label_ar'] ?? 'مميز')) ?>
                  </div>
                  <div class="completion-honor-title"><?= e((string) ($honor['title_ar'] ?? 'بنجاح')) ?></div>
                  <div class="completion-honor-subtitle"><?= e((string) ($honor['title'] ?? 'Successful Completion')) ?></div>
                </section>

                <section class="completion-meta-grid" aria-label="بيانات الشهادة">
                  <div class="completion-meta-item">
                    <strong>الدورة</strong>
                    <span><?= e($cycleLabel) ?></span>
                  </div>
                  <div class="completion-meta-item">
                    <strong>تاريخ الإصدار</strong>
                    <span><?= e((string) $item['issue_date_label']) ?></span>
                  </div>
                  <div class="completion-meta-item">
                    <strong>نسبة الأداء</strong>
                    <span><?= e((string) $item['percentage_label']) ?></span>
                  </div>
                  <div class="completion-meta-item">
                    <strong>التقييمات المكتملة</strong>
                    <span><?= e((string) ((int) ($certificate['completed_assessments'] ?? 0))) ?></span>
                  </div>
                </section>
              </div>

              <?php if (empty($item['has_results'])): ?>
                <div class="completion-note">
                  لا توجد تقييمات مرصودة لهذا الطالب بعد، لذلك تم إصدار شهادة إتمام مختصرة بدون مرتبة أداء رقمية.
                </div>
              <?php endif; ?>

              <footer class="completion-signature-row">
                <div class="completion-signature-block">
                  <strong>مدير/ة المركز</strong>
                  <span><?= e((string) ($application['director_name'] ?? $item['center_name'])) ?></span>
                </div>
                <div class="completion-signature-block">
                  <strong>اعتماد الشهادة</strong>
                  <span><?= e((string) ($honor['title_ar'] ?? 'إتمام ناجح')) ?></span>
                </div>
              </footer>
            </div>
          </article>
        <?php endforeach; ?>
      </div>
    <?php endif; ?>
  </div>
</section>
<?php if ($autoprint === 1 && $certificateItems !== []): ?>
<script>
window.addEventListener('load', function () {
  window.setTimeout(function () {
    window.print();
  }, 250);
});
</script>
<?php endif; ?>
<?php render_page_end(); ?>