<?php
// OPUS5 — Plan Orchestrator (doctrine 84)
// Moteur d'exécution de plans: respect depends_on, séquentiel + parallèle via curl_multi
// Actions: execute, status, resume
header('Content-Type: application/json');
$R = ['ts'=>date('c'), 'source'=>'opus5-plan-orchestrator'];

$PG_DSN = 'pgsql:host=10.1.0.3;port=5432;dbname=adx_system;user=admin;password=admin123';
try { $db = new PDO($PG_DSN, null, null, [PDO::ATTR_ERRMODE=>PDO::ERRMODE_EXCEPTION, PDO::ATTR_TIMEOUT=>5]); }
catch (Throwable $e) { http_response_code(500); echo json_encode(['err'=>'pg_connect']); exit; }

$raw = file_get_contents('php://input');
$d = json_decode($raw, true) ?: [];
$action = $_GET['action'] ?? ($d['action'] ?? 'status');

if ($action === 'execute') {
    $pid = preg_replace('/[^a-z0-9_-]/i', '', (string)($d['plan_id'] ?? ''));
    $dry_run = !empty($d['dry_run']);
    $max_parallel = min(5, (int)($d['max_parallel'] ?? 3));
    if (!$pid) { http_response_code(400); echo json_encode(['err'=>'no_plan_id']); exit; }

    // Fetch plan + steps
    $stmt = $db->prepare("SELECT * FROM admin.wevia_plans WHERE plan_id=?");
    $stmt->execute([$pid]);
    $plan = $stmt->fetch(PDO::FETCH_ASSOC);
    if (!$plan) { http_response_code(404); echo json_encode(['err'=>'plan_not_found']); exit; }

    $stmt = $db->prepare("SELECT * FROM admin.wevia_plan_steps WHERE plan_id=? ORDER BY step_order");
    $stmt->execute([$pid]);
    $steps = $stmt->fetchAll(PDO::FETCH_ASSOC);
    if (empty($steps)) { http_response_code(400); echo json_encode(['err'=>'no_steps']); exit; }

    $R['plan_id'] = $pid;
    $R['plan_name'] = $plan['name'];
    $R['steps_total'] = count($steps);
    $R['dry_run'] = $dry_run;
    $R['max_parallel'] = $max_parallel;

    // Mark plan running
    if (!$dry_run) {
        $db->prepare("UPDATE admin.wevia_plans SET status='running', started_at=COALESCE(started_at, NOW()) WHERE plan_id=?")->execute([$pid]);
    }

    // Execute steps respecting depends_on
    $done_ids = []; // step_ids completed
    $executed = [];
    $skipped = [];
    $failed = [];

    $rounds = 0;
    while (count($done_ids) + count($failed) < count($steps) && $rounds < 20) {
        $rounds++;
        // Find ready steps : pending + dependencies all done
        $ready = [];
        foreach ($steps as $s) {
            if ($s['status'] !== 'pending') continue;
            if (in_array((int)$s['step_order'], $done_ids)) continue;
            $deps = trim((string)($s['depends_on'] ?? '{}'), '{}');
            $dep_orders = $deps ? array_map('intval', explode(',', $deps)) : [];
            $all_done = true;
            // depends_on referencing step_order (not step_id auto-increment)
            foreach ($dep_orders as $dep_order) { if (!in_array($dep_order, $done_ids)) { $all_done = false; break; } }
            if ($all_done) $ready[] = $s;
            if (count($ready) >= $max_parallel) break;
        }
        if (empty($ready)) break; // No progress

        if ($dry_run) {
            foreach ($ready as $s) {
                $executed[] = ['step_id'=>$s['step_id'], 'step_order'=>$s['step_order'], 'name'=>$s['step_name'], 'action'=>'DRY_RUN', 'order'=>$s['step_order']];
                $done_ids[] = (int)$s['step_order'];
            }
            continue;
        }

        // Parallel exec via curl_multi
        $mh = curl_multi_init();
        $handles = [];
        foreach ($ready as $s) {
            $db->prepare("UPDATE admin.wevia_plan_steps SET status='running', started_at=NOW() WHERE step_id=?")->execute([$s['step_id']]);
            $url = $s['action_url'];
            if (!$url) {
                $db->prepare("UPDATE admin.wevia_plan_steps SET status='failed', result='no_url', finished_at=NOW() WHERE step_id=?")->execute([$s['step_id']]);
                $failed[] = ['step_id'=>$s['step_id'], 'step_order'=>$s['step_order'], 'name'=>$s['step_name'], 'err'=>'no_url'];
                continue;
            }
            $method = strtoupper((string)($s['action_method'] ?? 'POST'));
            $payload = $s['action_payload'] ?? '{}';

            // Ensure local host
            if (strpos($url, 'http://') !== 0 && strpos($url, 'https://') !== 0) {
                $url = 'http://127.0.0.1' . $url;
            }

            $ch = curl_init($url);
            $opts = [
                CURLOPT_HTTPHEADER => ['Content-Type: application/json'],
                CURLOPT_RETURNTRANSFER => true,
                CURLOPT_TIMEOUT => 30,
                CURLOPT_FOLLOWLOCATION => true,
                CURLOPT_MAXREDIRS => 3,
                CURLOPT_SSL_VERIFYPEER => false,
                CURLOPT_SSL_VERIFYHOST => 0
            ];
            if ($method === 'POST') {
                $opts[CURLOPT_POST] = true;
                $opts[CURLOPT_POSTFIELDS] = is_array($payload) ? json_encode($payload) : $payload;
            }
            curl_setopt_array($ch, $opts);
            curl_multi_add_handle($mh, $ch);
            $handles[] = ['ch'=>$ch, 'step'=>$s, 'started'=>microtime(true)];
        }

        $running = null;
        do { curl_multi_exec($mh, $running); curl_multi_select($mh, 0.1); } while ($running > 0);

        foreach ($handles as $h) {
            $body = curl_multi_getcontent($h['ch']);
            $http = curl_getinfo($h['ch'], CURLINFO_HTTP_CODE);
            $ms = round((microtime(true) - $h['started']) * 1000);
            if ($http === 200) {
                $db->prepare("UPDATE admin.wevia_plan_steps SET status='done', result=?, finished_at=NOW() WHERE step_id=?")->execute([substr((string)$body, 0, 2000), $h['step']['step_id']]);
                $executed[] = ['step_id'=>$h['step']['step_id'], 'name'=>$h['step']['step_name'], 'http'=>$http, 'ms'=>$ms, 'preview'=>substr((string)$body, 0, 150)];
                $done_ids[] = (int)$h['step']['step_order'];
            } else {
                $db->prepare("UPDATE admin.wevia_plan_steps SET status='failed', result=?, finished_at=NOW() WHERE step_id=?")->execute([substr("HTTP $http: " . (string)$body, 0, 2000), $h['step']['step_id']]);
                $failed[] = ['step_id'=>$h['step']['step_id'], 'name'=>$h['step']['step_name'], 'http'=>$http, 'ms'=>$ms];
            }
            curl_multi_remove_handle($mh, $h['ch']);
            curl_close($h['ch']);
        }
        curl_multi_close($mh);

        // Refresh steps (status updated)
        $stmt = $db->prepare("SELECT * FROM admin.wevia_plan_steps WHERE plan_id=? ORDER BY step_order");
        $stmt->execute([$pid]);
        $steps = $stmt->fetchAll(PDO::FETCH_ASSOC);
    }

    // Final plan status
    if (!$dry_run) {
        $final_status = count($failed) > 0 ? 'failed' : 'done';
        $db->prepare("UPDATE admin.wevia_plans SET status=?, finished_at=NOW() WHERE plan_id=?")->execute([$final_status, $pid]);
    }

    $R['rounds'] = $rounds;
    $R['executed'] = $executed;
    $R['failed'] = $failed;
    $R['done_count'] = count($done_ids);
    $R['failed_count'] = count($failed);
    $R['final_status'] = $dry_run ? 'dry_run' : (count($failed) > 0 ? 'failed' : 'done');
    $R['doctrine'] = '84 — plan orchestrator (parallel curl_multi + depends_on respect)';

    echo json_encode($R, JSON_PRETTY_PRINT|JSON_UNESCAPED_UNICODE);
    exit;
}

if ($action === 'status') {
    $pid = preg_replace('/[^a-z0-9_-]/i', '', $_GET['plan_id'] ?? $d['plan_id'] ?? '');
    if (!$pid) { http_response_code(400); echo json_encode(['err'=>'no_plan_id']); exit; }
    $stmt = $db->prepare("SELECT plan_id, name, status, started_at, finished_at,
        (SELECT COUNT(*) FROM admin.wevia_plan_steps WHERE plan_id=p.plan_id) AS total,
        (SELECT COUNT(*) FROM admin.wevia_plan_steps WHERE plan_id=p.plan_id AND status='done') AS done,
        (SELECT COUNT(*) FROM admin.wevia_plan_steps WHERE plan_id=p.plan_id AND status='running') AS running,
        (SELECT COUNT(*) FROM admin.wevia_plan_steps WHERE plan_id=p.plan_id AND status='failed') AS failed
        FROM admin.wevia_plans p WHERE plan_id=?");
    $stmt->execute([$pid]);
    $status = $stmt->fetch(PDO::FETCH_ASSOC);
    if (!$status) { http_response_code(404); echo json_encode(['err'=>'not_found']); exit; }
    $status['progress_pct'] = $status['total'] > 0 ? round(($status['done'] / $status['total']) * 100, 1) : 0;
    $R['status'] = $status;
    echo json_encode($R, JSON_PRETTY_PRINT);
    exit;
}

http_response_code(400);
echo json_encode(['err'=>'unknown_action', 'available'=>['execute', 'status']]);