<?php

// Find all content files in a directory
function findAllContentFiles(string $dir): array {
    if (!is_dir($dir)) return [];
    
    $files = scandir($dir) ?: [];
    $contentFiles = [];
    
    foreach ($files as $file) {
        if ($file === '.' || $file === '..' || $file === 'index.php') continue;
        
        $ext = pathinfo($file, PATHINFO_EXTENSION);
        if (!in_array($ext, CONTENT_EXTENSIONS)) continue;
        
        $filePath = "$dir/$file";
        if (!is_file($filePath)) continue;
        
        $contentFiles[] = [
            'path' => $filePath,
            'name' => $file,
            'ext' => $ext
        ];
    }
    
    // Let plugins filter content files (e.g., by language)
    $contentFiles = Hooks::apply(Hook::PROCESS_CONTENT, $contentFiles, $dir);
    
    // Sort by filename
    usort($contentFiles, fn($a, $b) => strnatcmp($a['name'], $b['name']));
    
    return array_column($contentFiles, 'path');
}

function parseRequestPath(Context $ctx): array {
    $requestPath = $ctx->requestPath;
    
    if (empty($requestPath)) {
        return ['type' => 'frontpage', 'path' => $ctx->contentDir];
    }
    
    $contentPath = $ctx->contentDir . '/' . $requestPath;
    
    // Check if it's a directory
    if (is_dir($contentPath)) {
        $items = scandir($contentPath) ?: [];
        $subdirs = array_filter($items, fn($item) => 
            $item !== '.' && $item !== '..' && is_dir("$contentPath/$item")
        );
        
        if (!empty($subdirs)) {
            return ['type' => 'list', 'path' => $contentPath];
        } else {
            return ['type' => 'page', 'path' => $contentPath];
        }
    }
    
    return ['type' => 'not_found', 'path' => $contentPath];
}

function loadMetadata(string $dirPath): ?array {
    $metadataFile = "$dirPath/metadata.ini";
    if (!file_exists($metadataFile)) return null;
    
    $metadata = parse_ini_file($metadataFile, true);
    if (!$metadata) return null;
    
    // Get base metadata (non-array values)
    $baseMetadata = array_filter($metadata, fn($key) => !is_array($metadata[$key]), ARRAY_FILTER_USE_KEY);
    
    // Store full metadata for plugins to access
    $baseMetadata['_raw'] = $metadata;
    
    // Let plugins modify metadata (e.g., merge language sections)
    return Hooks::apply(Hook::PROCESS_CONTENT, $baseMetadata, $dirPath, 'metadata');
}

function buildNavigation(Context $ctx): array {
    $items = scandir($ctx->contentDir) ?: [];
    $navItems = [];
    
    foreach ($items as $item) {
        if ($item === '.' || $item === '..' || !is_dir($ctx->contentDir . "/$item")) continue;
        
        $itemPath = "{$ctx->contentDir}/$item";
        $metadata = loadMetadata($itemPath);
        
        // Only include if explicitly marked as menu item
        // parse_ini_file returns boolean true as 1, false as empty string, and "true"/"false" as strings
        if (!$metadata || !isset($metadata['menu']) || !$metadata['menu']) {
            continue;
        }
        
        // Extract title
        $title = $metadata['title'] ?? extractTitle($itemPath) ?? ucfirst($item);
        
        // Use slug if available, otherwise use folder name
        $urlSlug = ($metadata && isset($metadata['slug'])) ? $metadata['slug'] : $item;
        
        $navItems[] = [
            'title' => $title,
            'url' => '/' . urlencode($urlSlug) . '/',
            'order' => (int)($metadata['menu_order'] ?? 999)
        ];
    }
    
    // Sort by menu_order
    usort($navItems, fn($a, $b) => $a['order'] <=> $b['order']);
    
    return $navItems;
}