<?php
/**
 * WEVIA Skills Explorer API · multi-source skills discovery
 * Sources: /skills/ disk + Qdrant weval_skills + tool-registry + arena
 * Opus Yacine · 19avr2026
 */
header('Content-Type: application/json; charset=utf-8');
header('Cache-Control: no-store');
header('Access-Control-Allow-Origin: *');

$action = $_GET['action'] ?? 'sources';
$QDRANT = 'http://127.0.0.1:6333';

function qdrant_call($url, $method = 'GET', $data = null) {
    $ch = curl_init($url);
    curl_setopt_array($ch, [
        CURLOPT_RETURNTRANSFER => true, 
        CURLOPT_TIMEOUT => 10,
        CURLOPT_CUSTOMREQUEST => $method,
        CURLOPT_HTTPHEADER => ['Content-Type: application/json'],
    ]);
    if ($data) curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($data));
    $r = curl_exec($ch);
    curl_close($ch);
    return json_decode($r ?: '{}', true);
}

$result = ['ok' => true, 'action' => $action, 'ts' => date('c')];

if ($action === 'sources') {
    // Source 1: Disk /skills/ (with and without SKILL.md)
    $all_dirs = glob('/var/www/html/skills/*', GLOB_ONLYDIR);
    $disk_skills = [];
    $big_catalogs = [];
    foreach ($all_dirs as $dir) {
        $name = basename($dir);
        $skill_md = "$dir/SKILL.md";
        $has_md = file_exists($skill_md);
        $desc = '';
        $sub_count = 0;
        
        if ($has_md) {
            $content = @file_get_contents($skill_md);
            if ($content) {
                foreach (explode("\n", $content) as $line) {
                    $line = trim($line);
                    if ($line && !str_starts_with($line, '#') && !str_starts_with($line, '---')) {
                        $desc = substr($line, 0, 200);
                        break;
                    }
                }
            }
            $disk_skills[] = [
                'name' => $name,
                'type' => 'skill',
                'desc' => $desc,
                'path' => "/skills/$name/SKILL.md",
            ];
        } else {
            // Count sub-skills inside catalog folder
            $sub_skills = glob("$dir/*", GLOB_ONLYDIR);
            $sub_count = count($sub_skills);
            $readme = @file_get_contents("$dir/README.md") ?: @file_get_contents("$dir/CATALOG.md");
            $readme_desc = '';
            if ($readme) {
                foreach (explode("\n", $readme) as $line) {
                    $line = trim($line);
                    if ($line && !str_starts_with($line, '#')) {
                        $readme_desc = substr($line, 0, 200);
                        break;
                    }
                }
            }
            $big_catalogs[] = [
                'name' => $name,
                'type' => 'catalog',
                'sub_count' => $sub_count,
                'desc' => $readme_desc ?: "Catalog avec $sub_count sub-items",
                'path' => "/skills/$name/",
                'samples' => array_slice(array_map('basename', $sub_skills), 0, 5),
            ];
        }
    }
    
    // Source 2: Qdrant weval_skills
    $qdrant_info = qdrant_call("$QDRANT/collections/weval_skills");
    $qdrant_points = $qdrant_info['result']['points_count'] ?? 0;
    
    // Source 3: Tools registry
    $reg = @json_decode(@file_get_contents('/var/www/html/api/wevia-tool-registry.json'), true);
    $tools_count = isset($reg['tools']) && is_array($reg['tools']) ? count($reg['tools']) : 0;
    $tools_sample = [];
    if ($tools_count) {
        foreach (array_slice($reg['tools'], 0, 10) as $t) {
            $tools_sample[] = ['name' => $t['name'] ?? $t['id'] ?? '?', 'desc' => substr($t['desc'] ?? $t['description'] ?? $t['kw'] ?? $t['cmd'] ?? '', 0, 150)];
        }
    }
    
    // Source 4: Arena declared
    $arena = @json_decode(@file_get_contents('/var/www/html/api/arena-intent-registry.json'), true);
    $arena_skills = $arena['total_skills'] ?? 0;
    
    $total = count($disk_skills) + $qdrant_points + $tools_count + $arena_skills;
    
    $result['sources'] = [
        'source_1_disk_skill_md' => [
            'label' => '/skills/ dossiers avec SKILL.md · vitrine visible',
            'count' => count($disk_skills),
            'url' => '/skills/',
            'items' => $disk_skills,
        ],
        'source_2_disk_big_catalogs' => [
            'label' => '/skills/ catalogs avec sub-skills · deer-flow/paperclip/etc',
            'count' => count($big_catalogs),
            'total_sub_items' => array_sum(array_column($big_catalogs, 'sub_count')),
            'items' => $big_catalogs,
        ],
        'source_3_qdrant_vectorized' => [
            'label' => 'Qdrant weval_skills · vectorisés pour semantic search',
            'count' => $qdrant_points,
            'url' => '/api/skills-explorer-api.php?action=qdrant_sample',
            'note' => 'Indexés depuis /opt/deer-flow/skills/ · searchable via embeddings',
        ],
        'source_4_tools_registry' => [
            'label' => 'wevia-tool-registry.json · tools callable',
            'count' => $tools_count,
            'url' => '/api/wevia-tool-registry.json',
            'samples' => $tools_sample,
        ],
        'source_5_arena_declared' => [
            'label' => 'Arena registry · skills déclarés (intents associés)',
            'count' => $arena_skills,
            'url' => '/api/arena-intent-registry.json',
        ],
        'TOTAL_ALL_SOURCES' => $total,
    ];
}

if ($action === 'qdrant_sample') {
    $limit = (int)($_GET['limit'] ?? 50);
    $limit = min(100, max(10, $limit));
    $offset = $_GET['offset'] ?? null;
    
    $payload = ['limit' => $limit, 'with_payload' => true];
    if ($offset) $payload['offset'] = $offset;
    
    $res = qdrant_call("$QDRANT/collections/weval_skills/points/scroll", 'POST', $payload);
    $points = $res['result']['points'] ?? [];
    
    $skills = [];
    foreach ($points as $p) {
        $pl = $p['payload'] ?? [];
        $skills[] = [
            'id' => $p['id'] ?? '?',
            'name' => $pl['name'] ?? '?',
            'desc' => substr($pl['desc'] ?? '', 0, 250),
            'source' => $pl['source'] ?? '?',
            'path' => $pl['path'] ?? '',
        ];
    }
    $result['qdrant_skills'] = $skills;
    $result['count'] = count($skills);
    $result['next_offset'] = $res['result']['next_page_offset'] ?? null;
}

if ($action === 'search' && !empty($_GET['q'])) {
    $q = strtolower($_GET['q']);
    
    // Scroll Qdrant with payload filter
    $matches = [];
    $offset = null;
    $scanned = 0;
    $max_scans = 5; // scroll 5 pages max
    for ($i = 0; $i < $max_scans; $i++) {
        $payload = ['limit' => 200, 'with_payload' => true];
        if ($offset) $payload['offset'] = $offset;
        $res = qdrant_call("$QDRANT/collections/weval_skills/points/scroll", 'POST', $payload);
        $points = $res['result']['points'] ?? [];
        $scanned += count($points);
        
        foreach ($points as $p) {
            $pl = $p['payload'] ?? [];
            $name = strtolower($pl['name'] ?? '');
            $desc = strtolower($pl['desc'] ?? '');
            if (strpos($name, $q) !== false || strpos($desc, $q) !== false) {
                $matches[] = [
                    'id' => $p['id'],
                    'name' => $pl['name'] ?? '?',
                    'desc' => substr($pl['desc'] ?? '', 0, 250),
                    'source' => $pl['source'] ?? '?',
                    'path' => $pl['path'] ?? '',
                ];
                if (count($matches) >= 50) break 2;
            }
        }
        $offset = $res['result']['next_page_offset'] ?? null;
        if (!$offset) break;
    }
    
    $result['query'] = $q;
    $result['scanned'] = $scanned;
    $result['matches_count'] = count($matches);
    $result['matches'] = $matches;
}

if ($action === 'tools') {
    $reg = @json_decode(@file_get_contents('/var/www/html/api/wevia-tool-registry.json'), true);
    $tools_list = [];
    if (isset($reg['tools']) && is_array($reg['tools'])) {
        $lim = (int)($_GET['limit'] ?? 0);
        $off = (int)($_GET['offset'] ?? 0);
        $all = $reg['tools'];
        $sliced = $lim > 0 ? array_slice($all, $off, $lim) : $all;
        foreach ($sliced as $t) {
            $tools_list[] = [
                'id' => $t['id'] ?? $t['name'] ?? '',
                'name' => $t['name'] ?? $t['id'] ?? '',
                'kw' => $t['kw'] ?? '',
                'desc' => substr((string)($t['desc'] ?? $t['description'] ?? $t['kw'] ?? $t['cmd'] ?? ''), 0, 200),
                'cmd' => isset($t['cmd']) ? substr((string)$t['cmd'], 0, 100) : '',
                'category' => $t['category'] ?? $t['cat'] ?? 'general',
            ];
        }
    }
    $result['total'] = isset($reg['tools']) ? count($reg['tools']) : 0;
    $result['returned'] = count($tools_list);
    $result['tools'] = $tools_list;
}
echo json_encode($result, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);