<?php
// WEVAL Arena Engine — Streaming + Consensus + Autonomous + Long-running
header("Content-Type: application/json");
header("Access-Control-Allow-Origin: *");
header("Access-Control-Allow-Headers: Content-Type");
if ($_SERVER["REQUEST_METHOD"]==="OPTIONS") exit;

$raw = json_decode(file_get_contents("php://input"), true) ?: [];
$msg = $raw["message"] ?? "";
$mode = $raw["mode"] ?? "single"; // single|consensus|autonomous|stream
$models = $raw["models"] ?? ["auto"];
$duration = intval($raw["duration"] ?? 0); // minutes (0=immediate)
$task_id = $raw["task_id"] ?? "";

if (!$msg && !$task_id) { echo json_encode(["error" => "no message"]); exit; }

// === CONSENSUS MODE: Query 3+ providers, merge best ===
if ($mode === "consensus") {
    $providers = ["nim-deepseek", "alibaba-qwen", "cf-deepseek-r1", "mistral", "or-gpt-oss"];
    $results = [];
    $env = @file_get_contents("/etc/weval/secrets.env") ?: "";

    foreach (array_slice($providers, 0, 3) as $p) {
        $ch = curl_init("https://weval-consulting.com/api/wevia-multi-provider.php");
        curl_setopt_array($ch, [CURLOPT_RETURNTRANSFER => true, CURLOPT_POST => true,
            CURLOPT_POSTFIELDS => json_encode(["message" => $msg, "model" => $p]),
            CURLOPT_HTTPHEADER => ["Content-Type: application/json"],
            CURLOPT_TIMEOUT => 30, CURLOPT_SSL_VERIFYPEER => false]);
        $r = curl_exec($ch);
        $code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        if ($code === 200) {
            $d = json_decode($r, true);
            if (!empty($d["content"])) {
                $results[] = ["provider" => $d["provider"] ?? $p, "content" => $d["content"], "length" => strlen($d["content"])];
            }
        }
    }

    if ($results) {
        // Pick best (longest) + add consensus summary
        usort($results, fn($a, $b) => $b["length"] - $a["length"]);
        $best = $results[0];
        $summary = "CONSENSUS (" . count($results) . " IAs):\n";
        foreach ($results as $i => $r) {
            $summary .= ($i+1) . ". " . $r["provider"] . " (" . $r["length"] . "ch)\n";
        }
        echo json_encode([
            "content" => $best["content"],
            "consensus_summary" => $summary,
            "provider" => "CONSENSUS " . count($results) . " IAs",
            "participants" => array_map(fn($r) => $r["provider"], $results),
            "model" => "multi-ai-consensus",
            "cost" => "0EUR SOUVERAIN"
        ]);
        exit;
    }
}

// === AUTONOMOUS MODE: Background task, check status ===
if ($mode === "autonomous") {
    $task_dir = "/tmp/arena-tasks/";
    @mkdir($task_dir, 0777, true);

    // Check existing task status
    if ($task_id) {
        $f = $task_dir . basename($task_id) . ".json";
        if (file_exists($f)) {
            echo file_get_contents($f);
        } else {
            echo json_encode(["status" => "pending", "task_id" => $task_id]);
        }
        exit;
    }

    // Create new autonomous task
    $tid = "arena_" . time() . "_" . substr(md5($msg), 0, 6);
    $task = [
        "task_id" => $tid,
        "status" => "running",
        "message" => $msg,
        "started" => date("Y-m-d H:i:s"),
        "duration_min" => $duration,
        "steps" => [],
    ];

    // Execute immediately with Master
    $ch = curl_init("https://weval-consulting.com/api/wevia-master-api.php");
    curl_setopt_array($ch, [CURLOPT_RETURNTRANSFER => true, CURLOPT_POST => true,
        CURLOPT_POSTFIELDS => json_encode(["message" => $msg]),
        CURLOPT_HTTPHEADER => ["Content-Type: application/json"],
        CURLOPT_TIMEOUT => 60, CURLOPT_SSL_VERIFYPEER => false]);
    $r = curl_exec($ch);
    $d = json_decode($r, true);
    $master_result = $d["content"] ?? "";

    $task["steps"][] = ["agent" => "WEVIA Master", "result" => substr($master_result, 0, 2000), "time" => date("H:i:s")];
    $task["status"] = "completed";
    $task["result"] = $master_result;

    file_put_contents($task_dir . $tid . ".json", json_encode($task));

    echo json_encode([
        "content" => $master_result,
        "task_id" => $tid,
        "status" => "completed",
        "provider" => "Arena Autonomous",
        "model" => "master+multi-agent",
        "cost" => "0EUR SOUVERAIN"
    ]);
    exit;
}

// === STREAM MODE: SSE streaming (for long coding tasks) ===
if ($mode === "stream") {
    header("Content-Type: text/event-stream");
    header("Cache-Control: no-cache");

    // Step 1: Master analysis
    echo "data: {\"step\":\"master\",\"status\":\"analyzing\"}\n\n";
    ob_flush(); flush();

    $ch = curl_init("https://weval-consulting.com/api/wevia-master-api.php");
    curl_setopt_array($ch, [CURLOPT_RETURNTRANSFER => true, CURLOPT_POST => true,
        CURLOPT_POSTFIELDS => json_encode(["message" => $msg]),
        CURLOPT_HTTPHEADER => ["Content-Type: application/json"], CURLOPT_TIMEOUT => 30]);
    $master = json_decode(curl_exec($ch), true)["content"] ?? "";
    echo "data: " . json_encode(["step" => "master", "content" => substr($master, 0, 500)]) . "\n\n";
    ob_flush(); flush();

    // Step 2: Best coder for implementation
    echo "data: {\"step\":\"coding\",\"status\":\"generating\"}\n\n";
    ob_flush(); flush();

    $ch = curl_init("https://weval-consulting.com/api/wevia-multi-provider.php");
    curl_setopt_array($ch, [CURLOPT_RETURNTRANSFER => true, CURLOPT_POST => true,
        CURLOPT_POSTFIELDS => json_encode(["message" => $msg, "model" => "nim-deepseek"]),
        CURLOPT_HTTPHEADER => ["Content-Type: application/json"], CURLOPT_TIMEOUT => 60]);
    $code_result = json_decode(curl_exec($ch), true)["content"] ?? "";
    echo "data: " . json_encode(["step" => "coding", "content" => $code_result]) . "\n\n";
    ob_flush(); flush();

    echo "data: {\"step\":\"done\",\"status\":\"complete\"}\n\n";
    echo "data: [DONE]\n\n";
    exit;
}

// === SINGLE MODE: Direct to multi-provider ===
$model = $models[0] ?? "auto";
$ch = curl_init("https://weval-consulting.com/api/wevia-multi-provider.php");
curl_setopt_array($ch, [CURLOPT_RETURNTRANSFER => true, CURLOPT_POST => true,
    CURLOPT_POSTFIELDS => json_encode(["message" => $msg, "model" => $model]),
    CURLOPT_HTTPHEADER => ["Content-Type: application/json"], CURLOPT_TIMEOUT => 30]);
$r = curl_exec($ch);
echo $r;
?>