html/api/ambre-tool-brainstorm.php

<?php
/**
 * ambre-tool-brainstorm.php — Multi-IA Brainstorm (parallel cascade)
 * Envoie la même question à 3-5 providers sovereign en parallèle
 * Synthétise les réponses en 1 output unifié
 * Input: JSON {topic}
 * Output: JSON {ok, summary, providers_used, raw_responses}
 */
header('Content-Type: application/json');
if ($_SERVER['REQUEST_METHOD'] !== 'POST') { echo json_encode(['ok'=>false,'error'=>'POST only']); exit; }

$input = json_decode(file_get_contents('php://input'), true);
$topic = trim($input['topic'] ?? $input['query'] ?? '');
if (strlen($topic) < 5) { echo json_encode(['ok'=>false,'error'=>'topic too short']); exit; }
$topic = substr($topic, 0, 800);

// Providers to query in parallel (sovereign cascade exposes these)
$providers = [
    'cerebras' => 'llama-3.3-70b',
    'groq' => 'llama-3.3-70b-versatile',
    'sambanova' => 'Meta-Llama-3.3-70B-Instruct',
    'gemini' => 'gemini-2.0-flash-exp',
    'cloudflare' => 'llama-3.3-70b-instruct',
];

$prompt = "Perspective sur: \"$topic\"\n\nDonne UNE idee/angle/insight unique et original en 3-5 phrases maximum. Pas d'intro, va direct a l'insight.";

$mh = curl_multi_init();
$handles = [];
foreach ($providers as $prov => $model) {
    $ch = curl_init('http://127.0.0.1:4000/v1/chat/completions');
    curl_setopt_array($ch, [
        CURLOPT_POST => true, CURLOPT_RETURNTRANSFER => true,
        CURLOPT_POSTFIELDS => json_encode([
            'model' => $model,
            'provider' => $prov,
            'messages' => [['role'=>'user', 'content'=>$prompt]],
            'max_tokens' => 400,
            'temperature' => 0.85
        ]),
        CURLOPT_HTTPHEADER => ['Content-Type: application/json'],
        CURLOPT_TIMEOUT => 30,
    ]);
    curl_multi_add_handle($mh, $ch);
    $handles[$prov] = $ch;
}

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

$responses = [];
$successful = 0;
foreach ($handles as $prov => $ch) {
    $code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    $body = curl_multi_getcontent($ch);
    if ($code === 200) {
        $data = json_decode($body, true);
        $content = $data['choices'][0]['message']['content'] ?? '';
        if ($content) {
            $responses[$prov] = substr(trim($content), 0, 800);
            $successful++;
        }
    }
    curl_multi_remove_handle($mh, $ch);
    curl_close($ch);
}
curl_multi_close($mh);

if ($successful === 0) {
    echo json_encode(['ok'=>false, 'error'=>'All providers failed']);
    exit;
}

// Synthesis via 1 additional provider
$synth_input = "Synthetise les perspectives suivantes en 1 resume structure et enrichi:\n\n";
foreach ($responses as $prov => $resp) {
    $synth_input .= "### $prov\n$resp\n\n";
}
$synth_input .= "\n\nFormat reponse:\n- 3-5 points cles majeurs (bullets)\n- 1 paragraphe synthese (4-6 phrases)\n- Pas d'intro type 'voici la synthese'";

$ch = curl_init('http://127.0.0.1:4000/v1/chat/completions');
curl_setopt_array($ch, [
    CURLOPT_POST => true, CURLOPT_RETURNTRANSFER => true,
    CURLOPT_POSTFIELDS => json_encode([
        'model' => 'auto',
        'messages' => [['role'=>'user', 'content'=>$synth_input]],
        'max_tokens' => 1200,
        'temperature' => 0.5
    ]),
    CURLOPT_HTTPHEADER => ['Content-Type: application/json'],
    CURLOPT_TIMEOUT => 45,
]);
$synth_raw = curl_exec($ch);
$synth_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);

$synthesis = '';
if ($synth_code === 200) {
    $synth_data = json_decode($synth_raw, true);
    $synthesis = $synth_data['choices'][0]['message']['content'] ?? '';
}

echo json_encode([
    'ok' => true,
    'summary' => $synthesis ?: 'Synthese indisponible - voir raw_responses',
    'providers_used' => array_keys($responses),
    'providers_count' => $successful,
    'raw_responses' => $responses,
    'topic' => $topic,
]);