<?php

declare(strict_types=1);

$root = dirname(__DIR__);
$manifestPath = $root . '/backend/storage/curriculum/_incoming/grade_10/manifest.accepted.json';
$specRoot = $root . '/docs/virtual_labs/grade_10';
$manifest = json_decode((string) file_get_contents($manifestPath), true, 512, JSON_THROW_ON_ERROR);
$expected = [];
$errors = [];

foreach ($manifest['lessons'] ?? [] as $lesson) {
    $expected[(string) $lesson['id']] = (string) $lesson['file'];
}

$seen = [];
$iterator = new RecursiveIteratorIterator(new RecursiveDirectoryIterator($specRoot));
foreach ($iterator as $file) {
    if (!$file->isFile() || !str_ends_with($file->getFilename(), '.lab.md')) {
        continue;
    }
    $text = (string) file_get_contents($file->getPathname());
    if (!preg_match('/^curriculum_lesson_id:\s*(.+)$/m', $text, $idMatch)) {
        $errors[] = "Missing curriculum_lesson_id: {$file->getPathname()}";
        continue;
    }
    $id = trim($idMatch[1]);
    if (isset($seen[$id])) {
        $errors[] = "Duplicate lesson id {$id}";
    }
    $seen[$id] = true;
    if (!isset($expected[$id])) {
        $errors[] = "Unknown lesson id {$id}";
    }
    if (!preg_match('/^source_markdown:\s*(.+)$/m', $text, $sourceMatch) || trim($sourceMatch[1]) !== ($expected[$id] ?? null)) {
        $errors[] = "Wrong source binding for {$id}";
    }
    foreach (['## 3. فكرة اللعبة التعليمية', '## 4. المشهد المتحرك', '## 7. محطات فحص الفهم', '## 11. سيناريوهات التحقق الإلزامية'] as $required) {
        if (!str_contains($text, $required)) {
            $errors[] = "Missing section '{$required}' in {$id}";
        }
    }
}

foreach (array_keys($expected) as $id) {
    if (!isset($seen[$id])) {
        $errors[] = "Missing spec for {$id}";
    }
}

if (count($seen) !== count($expected)) {
    $errors[] = 'Count mismatch: expected ' . count($expected) . ', found ' . count($seen);
}

if ($errors !== []) {
    fwrite(STDERR, implode("\n", $errors) . "\n");
    exit(1);
}

fwrite(STDOUT, 'Validated ' . count($seen) . " one-to-one lesson lab specifications.\n");