<?php
/**
 * WEVIA MASTER BRIDGE v1.0
 * Bridge between existing weval-chatbot-api.php and Master Router
 * 
 * USAGE (from any PHP file):
 *   require_once '/opt/wevia-brain/wevia-master-bridge.php';
 *   $result = wevia_master_route($message, $systemPrompt, $history);
 *   echo $result['content'];
 * 
 * Or as internal API:
 *   curl http://127.0.0.1/api/wevia-master-bridge.php -d '{"message":"..."}'
 */

// Load master router + RAG if not already loaded
if (!function_exists('mr_route')) {
    require_once __DIR__ . '/wevia-master-router.php';
}

/**
 * Simple wrapper function for existing code integration
 * Returns response in the same format as existing providers
 */
function wevia_master_route($message, $systemPrompt = '', $history = [], $options = []) {
    if (empty($systemPrompt)) {
        $systemPrompt = "Tu es WEVIA, l'IA cognitive souveraine de WEVAL Consulting (Casablanca). Réponds de manière précise, technique et directe.";
    }

    $result = mr_route($message, $systemPrompt, $history, $options);

    // Return in format compatible with existing chatbot
    return [
        'content' => $result['content'] ?? '',
        'model' => $result['model'] ?? 'unknown',
        'provider' => 'wevia-master-' . ($result['provider'] ?? 'unknown'),
        'tier' => $result['tier'] ?? -1,
        'latency_ms' => $result['latency_ms'] ?? 0,
        'cost' => $result['cost'] ?? 0,
        'source' => $result['source'] ?? 'master-router',
        'rag_results' => count($result['routing']['rag']['results_count'] ?? []),
        
        // Compatible with existing chatbot format
        'text' => $result['content'] ?? '',
        'success' => !empty($result['content']),
        'error' => empty($result['content']) ? 'No response from any provider' : null,
    ];
}

/**
 * Quick test function
 */
function wevia_master_test($msg = 'Bonjour WEVIA') {
    return wevia_master_route($msg);
}

// If called directly as API
if (basename($_SERVER['SCRIPT_FILENAME'] ?? '') === 'wevia-master-bridge.php') {
    header("Content-Type: application/json; charset=utf-8");
    header("Access-Control-Allow-Origin: *");
    
    if ($_SERVER["REQUEST_METHOD"] === "POST") {
        $input = json_decode(file_get_contents("php://input"), true);
        $msg = $input['message'] ?? $input['msg'] ?? '';
        $sys = $input['system'] ?? '';
        $hist = $input['history'] ?? [];
        
        if (empty(trim($msg))) {
            echo json_encode(['error' => 'message required']);
            exit;
        }
        
        echo json_encode(wevia_master_route($msg, $sys, $hist), JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE);
    } else {
        echo json_encode([
            'bridge' => 'WEVIA Master Bridge v1.0',
            'usage' => 'POST with {"message":"your question"}',
            'function' => 'wevia_master_route($message, $systemPrompt, $history)',
        ]);
    }
}