<?php
header("Content-Type: application/json");
header("Access-Control-Allow-Origin: *");
$KEY = "BLADE2026";
$DIR = "/var/www/html/api/blade-tasks";
$k = $_REQUEST["k"] ?? "";
if ($k !== $KEY) { http_response_code(403); die(json_encode(["error"=>"auth"])); }
$action = $_REQUEST["action"] ?? "poll";

if ($action === "poll") {
    $next = null;
    $pending = 0;
    $files = glob("$DIR/task_*.json");
    sort($files);
    foreach ($files as $f) {
        $d = @json_decode(@file_get_contents($f), true);
        if (!$d) continue;
        if (($d["status"] ?? "") === "pending") {
            if (!$next) {
                $next = $d;
                $next["_file"] = basename($f);
                $d["status"] = "dispatched";
                $d["dispatched_at"] = date("c");
                @file_put_contents($f, json_encode($d, JSON_PRETTY_PRINT));
            } else {
                $pending++;
            }
        }
    }
    echo json_encode(["task"=>$next,"pending"=>$pending]);
    exit;
}

if ($action === "done") {
    $tf = basename($_REQUEST["file"] ?? "");
    $result = $_REQUEST["result"] ?? $_POST["result"] ?? "";
    $path = "$DIR/$tf";
    if ($tf && file_exists($path)) {
        $d = json_decode(file_get_contents($path), true);
        $d["status"] = "done";
        $d["completed_at"] = date("c");
        $d["result"] = substr($result, 0, 2000);
        file_put_contents($path, json_encode($d, JSON_PRETTY_PRINT));
        echo json_encode(["ok"=>true]);
    } else {
        echo json_encode(["error"=>"not found"]);
    }
    exit;
}

// Status
$files = glob("$DIR/task_*.json");
$stats = ["pending"=>0,"dispatched"=>0,"done"=>0,"total"=>count($files)];
foreach ($files as $f) {
    $d = @json_decode(@file_get_contents($f), true);
    $s = $d["status"] ?? "?";
    if (isset($stats[$s])) $stats[$s]++;
}
$hb = @json_decode(@file_get_contents("$DIR/heartbeat.json"), true);
echo json_encode(["stats"=>$stats,"heartbeat"=>$hb]);