html/api/ambre-tool-image-gen.php

<?php
/**
 * ambre-tool-image-gen.php — Text2Image premium
 * Uses Huggingface Inference API (gratuit via token HF public cascade)
 * Input: JSON {prompt, style?}
 * Output: JSON {ok, url, prompt, size_kb}
 * SAFE: no WEVAL secrets, no internal server refs
 */
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);
$prompt = trim($input['prompt'] ?? $input['topic'] ?? '');
$style = trim($input['style'] ?? '');
if (strlen($prompt) < 3) { echo json_encode(['ok'=>false,'error'=>'prompt too short']); exit; }
$prompt = substr($prompt, 0, 500);

// Style augmentation
$style_suffix = [
    'photorealistic' => ', highly detailed, 8k, photorealistic, professional photography, sharp focus',
    'art' => ', digital art, trending on artstation, concept art, vibrant colors',
    'minimalist' => ', minimalist, clean design, simple, elegant',
    'corporate' => ', corporate professional, clean modern, premium quality',
    'default' => ', high quality, detailed, professional',
][$style] ?? ', high quality, detailed, professional';

$full_prompt = $prompt . $style_suffix;

// Try sovereign image endpoint first (if exists)
$sovereign_url = 'http://127.0.0.1:4000/v1/images/generations';
$ch = curl_init($sovereign_url);
curl_setopt_array($ch, [
    CURLOPT_POST => true, CURLOPT_RETURNTRANSFER => true,
    CURLOPT_POSTFIELDS => json_encode(['prompt'=>$full_prompt,'n'=>1,'size'=>'1024x1024']),
    CURLOPT_HTTPHEADER => ['Content-Type: application/json'],
    CURLOPT_TIMEOUT => 120,
]);
$r1 = curl_exec($ch);
$c1 = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);

if ($c1 === 200) {
    $d1 = json_decode($r1, true);
    $img_url = $d1['data'][0]['url'] ?? $d1['data'][0]['b64_json'] ?? null;
    if ($img_url) {
        // Save locally
        $filename = 'img-' . substr(md5($prompt . microtime(true)), 0, 10) . '.png';
        $outpath = '/var/www/html/files/' . $filename;
        if (!is_dir('/var/www/html/files')) { mkdir('/var/www/html/files', 0755, true); }
        
        if (strpos($img_url, 'http') === 0) {
            file_put_contents($outpath, file_get_contents($img_url));
        } else {
            // base64
            file_put_contents($outpath, base64_decode($img_url));
        }
        
        if (file_exists($outpath) && filesize($outpath) > 100) {
            echo json_encode([
                'ok'=>true, 'url'=>'/files/'.$filename, 'prompt'=>$prompt,
                'style'=>$style ?: 'default',
                'size_kb'=>round(filesize($outpath)/1024, 1),
                'provider'=>'sovereign'
            ]);
            exit;
        }
    }
}

// Fallback: existing ambre-tool-image.php (already wired in platform)
$ch = curl_init('http://127.0.0.1/api/ambre-tool-image.php');
curl_setopt_array($ch, [
    CURLOPT_POST => true, CURLOPT_RETURNTRANSFER => true,
    CURLOPT_POSTFIELDS => json_encode(['prompt'=>$full_prompt,'topic'=>$full_prompt]),
    CURLOPT_HTTPHEADER => ['Content-Type: application/json'],
    CURLOPT_TIMEOUT => 90,
]);
$r2 = curl_exec($ch);
$c2 = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);

if ($c2 === 200) {
    $d2 = json_decode($r2, true);
    $url = $d2['url'] ?? $d2['image'] ?? null;
    if ($url) {
        echo json_encode([
            'ok'=>true, 'url'=>$url, 'prompt'=>$prompt,
            'style'=>$style ?: 'default',
            'provider'=>'fallback-ambre-image'
        ]);
        exit;
    }
}

echo json_encode(['ok'=>false, 'error'=>'image gen unavailable', 'attempted'=>['sovereign','ambre-image']]);