<?php
/**
 * Odoo Clone ERP - Entry Point
 * Serves static assets, proxies /api/*, and falls back to the React SPA.
 */

$requestUri = $_SERVER['REQUEST_URI'] ?? '/';
$requestPath = parse_url($requestUri, PHP_URL_PATH) ?? '/';

// API requests - proxy to backend service.
if (strpos($requestPath, '/api/') === 0) {
    $apiUrl = 'http://localhost:3001' . $requestUri;

    $ch = curl_init($apiUrl);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_CUSTOMREQUEST, $_SERVER['REQUEST_METHOD'] ?? 'GET');
    curl_setopt($ch, CURLOPT_HTTPHEADER, [
        'Content-Type: application/json',
        'Authorization: ' . ($_SERVER['HTTP_AUTHORIZATION'] ?? '')
    ]);

    $body = file_get_contents('php://input');
    if ($body !== false && $body !== '') {
        curl_setopt($ch, CURLOPT_POSTFIELDS, $body);
    }

    $response = curl_exec($ch);
    $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    $curlError = curl_error($ch);
    curl_close($ch);

    if ($response === false) {
        http_response_code(502);
        header('Content-Type: application/json');
        echo json_encode([
            'error' => 'API backend is unavailable',
            'details' => $curlError,
        ]);
        exit;
    }

    http_response_code($httpCode > 0 ? $httpCode : 200);
    header('Content-Type: application/json');
    echo $response;
    exit;
}

// Serve existing static files so asset requests are not rewritten to HTML.
$documentRoot = realpath(__DIR__);
$resolvedFile = realpath(__DIR__ . $requestPath);

if (
    $documentRoot !== false &&
    $resolvedFile !== false &&
    strpos($resolvedFile, $documentRoot) === 0 &&
    is_file($resolvedFile) &&
    strtolower(pathinfo($resolvedFile, PATHINFO_EXTENSION)) !== 'php'
) {
    $contentType = function_exists('mime_content_type') ? mime_content_type($resolvedFile) : false;
    if ($contentType === false) {
        $ext = strtolower(pathinfo($resolvedFile, PATHINFO_EXTENSION));
        $map = [
            'css' => 'text/css',
            'js' => 'application/javascript',
            'mjs' => 'application/javascript',
            'json' => 'application/json',
            'svg' => 'image/svg+xml',
            'png' => 'image/png',
            'jpg' => 'image/jpeg',
            'jpeg' => 'image/jpeg',
            'gif' => 'image/gif',
            'ico' => 'image/x-icon',
            'woff' => 'font/woff',
            'woff2' => 'font/woff2',
            'ttf' => 'font/ttf',
            'html' => 'text/html',
        ];
        $contentType = $map[$ext] ?? 'application/octet-stream';
    }

    header('Content-Type: ' . $contentType);
    readfile($resolvedFile);
    exit;
}

// SPA fallback
header('Content-Type: text/html');
readfile(__DIR__ . '/erp-index.html');