<?php
// Logseq Import Plugin — backend route handler.
//
// Registers POST /api/import-logseq which accepts a Logseq vault ZIP upload and:
//   1. Copies vault assets into public/uploads/ with randomized filenames
//   2. Rewrites markdown image references to point at the new upload paths
//   3. Strips Logseq-specific bullet outline prefixes and property blocks
//   4. Creates a card per journal entry (date-titled) and per page
//   5. Places everything in an "import" bucket (created if missing)

PluginManager::instance()->onApiRoute(function (string $route, string $method): void {
    if ($route !== '/api/import-logseq' || $method !== 'POST') return;

    if (empty($_FILES['file']) || $_FILES['file']['error'] !== UPLOAD_ERR_OK) {
        http_response_code(400);
        echo json_encode(['error' => 'no file']);
        exit;
    }

    $zip = new ZipArchive();
    if ($zip->open($_FILES['file']['tmp_name']) !== true) {
        http_response_code(400);
        echo json_encode(['error' => 'invalid zip']);
        exit;
    }

    $db = Database::connect();
    $uploadDir = dirname(__DIR__, 2) . '/uploads';
    if (!is_dir($uploadDir)) mkdir($uploadDir, 0777, true);

    // Find the vault root (the directory containing journals/ or pages/)
    $prefix = '';
    for ($i = 0; $i < $zip->numFiles; $i++) {
        $name = $zip->getNameIndex($i);
        if (preg_match('#^(.*/)?journals/#', $name, $m)) { $prefix = $m[1] ?? ''; break; }
        if (preg_match('#^(.*/)?pages/#', $name, $m)) { $prefix = $m[1] ?? ''; break; }
    }

    // 1. Copy assets → uploads/ with randomized filenames and build a rename map.
    $assetMap = [];
    for ($i = 0; $i < $zip->numFiles; $i++) {
        $name = $zip->getNameIndex($i);
        if (!str_starts_with($name, $prefix . 'assets/')) continue;
        if (str_ends_with($name, '/')) continue;
        $content = $zip->getFromIndex($i);
        if ($content === false) continue;
        $origName = basename($name);
        $ext = pathinfo($origName, PATHINFO_EXTENSION) ?: 'bin';
        $newName = bin2hex(random_bytes(16)) . '.' . strtolower($ext);
        file_put_contents($uploadDir . '/' . $newName, $content);
        $assetMap[$origName] = $newName;
    }

    // Helper: rewrite image references in markdown body to the new upload paths.
    $rewriteImages = function ($body) use ($assetMap) {
        // Logseq patterns: ![desc](../assets/file.png), ![desc](/assets/file.png), ![desc](assets/file.png)
        $body = preg_replace_callback('#!\[([^\]]*)\]\((?:\.\./)?(?:assets/)?([^)]+)\)#', function ($m) use ($assetMap) {
            $file = basename($m[2]);
            if (isset($assetMap[$file])) return '![' . $m[1] . '](uploads/' . $assetMap[$file] . ')';
            return $m[0];
        }, $body);
        // Also handle URL-encoded filenames in the assets path.
        $body = preg_replace_callback('#!\[([^\]]*)\]\((?:\.\./)?assets/([^)]+)\)#', function ($m) use ($assetMap) {
            $file = urldecode(basename($m[2]));
            if (isset($assetMap[$file])) return '![' . $m[1] . '](uploads/' . $assetMap[$file] . ')';
            return $m[0];
        }, $body);
        return $body;
    };

    // Helper: strip Logseq-specific syntax (property blocks + bullet outline prefixes).
    $cleanBody = function ($body) {
        $lines = explode("\n", $body);
        $cleaned = [];
        foreach ($lines as $line) {
            // Skip Logseq properties (key:: value at start of line)
            if (preg_match('/^[a-z_-]+::\s/', $line)) continue;
            // Remove leading "- " bullet outline format (Logseq default)
            $line = preg_replace('/^(\t*)- /', '$1', $line);
            $cleaned[] = $line;
        }
        return implode("\n", $cleaned);
    };

    // Ensure the "import" bucket exists.
    $importBucket = $db->query("SELECT id FROM buckets WHERE name = 'import'")->fetchColumn();
    if (!$importBucket) {
        $db->prepare("INSERT INTO buckets (name, position) VALUES ('import', 999)")->execute();
        $importBucket = $db->lastInsertId();
    }

    $imported = 0;

    // 2. Import journals → date-titled cards.
    for ($i = 0; $i < $zip->numFiles; $i++) {
        $name = $zip->getNameIndex($i);
        if (!str_starts_with($name, $prefix . 'journals/')) continue;
        if (!str_ends_with($name, '.md')) continue;
        $content = $zip->getFromIndex($i);
        if ($content === false || !trim($content)) continue;

        $basename = pathinfo(basename($name), PATHINFO_FILENAME);
        // 2025_06_18 → 2025-06-18
        $title = str_replace('_', '-', $basename);
        if (!preg_match('/^\d{4}-\d{2}-\d{2}$/', $title)) continue;

        $body = $rewriteImages($cleanBody($content));
        preg_match_all('/(?<=\s|^)#([a-zA-Z0-9_\/-]+)/m', $body, $tm);
        $tags = implode(',', array_unique(array_map('strtolower', $tm[1] ?? [])));

        $db->prepare('INSERT INTO cards (title, body, color, tags, position, bucket_id, created_at) VALUES (?, ?, ?, ?, -1, ?, ?)')
            ->execute([$title, trim($body), '#38bdf8', $tags, $importBucket, $title . ' 00:00:00']);
        $imported++;
    }

    // 3. Import pages → cards with the page name as title.
    for ($i = 0; $i < $zip->numFiles; $i++) {
        $name = $zip->getNameIndex($i);
        if (!str_starts_with($name, $prefix . 'pages/')) continue;
        if (!str_ends_with($name, '.md')) continue;
        $content = $zip->getFromIndex($i);
        if ($content === false || !trim($content)) continue;

        $title = pathinfo(basename($name), PATHINFO_FILENAME);
        // Skip Logseq internal pages.
        if (in_array(strtolower($title), ['contents', 'favorites'])) continue;

        $body = $rewriteImages($cleanBody($content));
        preg_match_all('/(?<=\s|^)#([a-zA-Z0-9_\/-]+)/m', $body, $tm);
        $tags = implode(',', array_unique(array_map('strtolower', $tm[1] ?? [])));

        $db->prepare('INSERT INTO cards (title, body, color, tags, position, bucket_id) VALUES (?, ?, ?, ?, -1, ?)')
            ->execute([$title, trim($body), '#8b5cf6', $tags, $importBucket]);
        $imported++;
    }

    $zip->close();
    echo json_encode(['ok' => true, 'imported' => $imported, 'assets' => count($assetMap)]);
    exit;
});