<?php
header('Content-Type: application/json');
header('Access-Control-Allow-Origin: *');

if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
    http_response_code(405);
    echo json_encode(['error' => 'Method not allowed']);
    exit;
}

$stripe_secret_key = getenv('STRIPE_SECRET_KEY') ?: 'sk_test_YOUR_SECRET_KEY_HERE';
$input = file_get_contents('php://input');
$data = json_decode($input, true);

if (!$data || !isset($data['product_id']) || !isset($data['price'])) {
    http_response_code(400);
    echo json_encode(['error' => 'Missing fields']);
    exit;
}

$product_id = $data['product_id'];
$price_cents = (int)$data['price'];
$currency = $data['currency'] ?? 'eur';

$products = [
    'inference_tokens' => [
        'name' => 'Inference Tokens — API IA Huawei Cloud',
        'description' => '1M tokens/mois • 20+ LLM (Llama, Qwen, Claude, GPT) • Latence <50ms • Dashboard analytics'
    ],
    'gpu_a100' => [
        'name' => 'GPU A100 — IA & ML',
        'description' => 'NVIDIA A100 40GB • 96 vCPU • 768GB RAM • 2TB NVMe • TensorFlow/PyTorch'
    ],
    'modelarts' => [
        'name' => 'ModelArts — Plateforme IA',
        'description' => '100+ modèles • Training distribué • AutoML • MLOps complet'
    ],
    'cloud_stack' => [
        'name' => 'Cloud Stack — Infrastructure Hybride',
        'description' => '3-100+ nodes on-premise • API Huawei Cloud • Souveraineté totale'
    ],
    'cce_k8s' => [
        'name' => 'CCE — Kubernetes Managé',
        'description' => 'K8s 1.28+ • 1-1000 nodes • Auto-scaling • Prometheus • Istio'
    ],
    'ecs_compute' => [
        'name' => 'ECS Compute — Production',
        'description' => '32 vCPU • 128GB RAM • 1TB SSD • HA 99.95%'
    ],
    'gpu_v100' => [
        'name' => 'GPU V100 — Deep Learning',
        'description' => 'NVIDIA V100 32GB • 64 vCPU • 512GB RAM • Tensor Cores'
    ],
    'gaussdb' => [
        'name' => 'GaussDB — Database IA',
        'description' => 'MySQL • 10TB auto-scale • 100K IOPS • AI optimizer'
    ],
    'obs_storage' => [
        'name' => 'Object Storage OBS',
        'description' => '10TB • S3 API • CDN inclus • Encryption'
    ],
    'bare_metal' => [
        'name' => 'Bare Metal Server',
        'description' => 'Xeon Gold • 96 cores • 1TB RAM • RDMA 100 Gbps'
    ],
    'functiongraph' => [
        'name' => 'FunctionGraph — Serverless',
        'description' => 'Multi-language • Auto-scaling • Event triggers • 1M gratuit'
    ]
];

if (!isset($products[$product_id])) {
    http_response_code(400);
    echo json_encode(['error' => 'Invalid product']);
    exit;
}

$product = $products[$product_id];

try {
    require_once('/var/www/vendor/stripe/stripe-php/init.php');
    \Stripe\Stripe::setApiKey($stripe_secret_key);

    $session = \Stripe\Checkout\Session::create([
        'payment_method_types' => ['card'],
        'line_items' => [[
            'price_data' => [
                'currency' => $currency,
                'product_data' => [
                    'name' => $product['name'],
                    'description' => $product['description'],
                ],
                'unit_amount' => $price_cents,
            ],
            'quantity' => 1,
        ]],
        'mode' => 'payment',
        'success_url' => 'https://weval-consulting.com/products/huawei-success.html?session_id={CHECKOUT_SESSION_ID}',
        'cancel_url' => 'https://weval-consulting.com/huawei-cloud.html',
        'customer_email' => $data['email'] ?? null,
        'metadata' => [
            'product_id' => $product_id,
            'provider' => 'huawei_cloud',
            'partner' => 'weval'
        ]
    ]);

    echo json_encode([
        'sessionId' => $session->id,
        'url' => $session->url
    ]);

} catch (\Stripe\Exception\ApiErrorException $e) {
    http_response_code(500);
    echo json_encode([
        'error' => 'Stripe API error',
        'message' => $e->getMessage()
    ]);
} catch (Exception $e) {
    http_response_code(500);
    echo json_encode([
        'error' => 'Server error',
        'message' => $e->getMessage()
    ]);
}