<?php
// ai-process.php - Process KI-Fit Check questionnaire with AI

header('Content-Type: application/json');
header('Access-Control-Allow-Origin: *');
header('Access-Control-Allow-Methods: POST, OPTIONS');
header('Access-Control-Allow-Headers: Content-Type');

// Handle preflight requests
if ($_SERVER['REQUEST_METHOD'] === 'OPTIONS') {
    exit(0);
}

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

// Get POST data
$input = json_decode(file_get_contents('php://input'), true);

if (!$input) {
    http_response_code(400);
    echo json_encode(['error' => 'Invalid JSON input']);
    exit;
}

// Include your config
require_once 'config.php';
$config = include 'config.php';

try {
    // Prepare AI prompt based on questionnaire answers
    $prompt = generateAIPrompt($input);
    
    // Call AI service (using your configured endpoint)
    $aiResponse = callAIService($prompt, $config);
    
    // Process and format the response
    $result = processAIResponse($aiResponse, $input);
    
    echo json_encode([
        'success' => true,
        'data' => $result,
        'timestamp' => date('Y-m-d H:i:s')
    ]);
    
} catch (Exception $e) {
    http_response_code(500);
    echo json_encode([
        'error' => 'AI processing failed',
        'message' => $e->getMessage()
    ]);
}

// ===== HELPER FUNCTIONS =====

function generateAIPrompt(array $answers): string {
    $prompt = "Analysiere diese KI-Readiness-Bewertung eines Unternehmens und erstelle eine persönliche Auswertung:\n\n";
    
    // Add company info
    $prompt .= "Unternehmensinformationen:\n";
    if (isset($answers['q2'])) {
        $prompt .= "- Branche: " . htmlspecialchars($answers['q2']) . "\n";
    }
    if (isset($answers['q1'])) {
        $prompt .= "- Größe: " . htmlspecialchars($answers['q1']) . "\n";
    }
    
    // Add goals
    if (isset($answers['q4'])) {
        $prompt .= "\nPrimäres KI-Ziel: " . htmlspecialchars($answers['q4']) . "\n";
    }
    
    // Add challenges
    if (isset($answers['q12'])) {
        $prompt .= "\nGrößte Herausforderung: " . htmlspecialchars($answers['q12']) . "\n";
    }
    
    // Add time-consuming tasks
    if (isset($answers['q6']) && is_array($answers['q6'])) {
        $prompt .= "\nZeitintensive Aufgaben:\n";
        foreach ($answers['q6'] as $task) {
            $prompt .= "- " . htmlspecialchars($task) . "\n";
        }
    }
    
    // Add current automation
    if (isset($answers['q7'])) {
        $prompt .= "\nAktuelle Automatisierung:\n" . htmlspecialchars($answers['q7']) . "\n";
    }
    
    // Add budget
    if (isset($answers['q9'])) {
        $prompt .= "\nKI-Budget: " . htmlspecialchars($answers['q9']) . "\n";
    }
    
    // Add technical affinity
    if (isset($answers['q10'])) {
        $prompt .= "\nTechnische Affinität: " . htmlspecialchars($answers['q10']) . "/5\n";
    }
    
    // Add timeline
    if (isset($answers['q13'])) {
        $prompt .= "\nUmsetzungszeitraum: " . htmlspecialchars($answers['q13']) . "\n";
    }
    
    $prompt .= "\n---\n";
    $prompt .= "Erstelle eine strukturierte Analyse mit:\n";
    $prompt .= "1. KI-Readiness Score (0-100)\n";
    $prompt .= "2. 3 konkrete Empfehlungen für KI-Tools\n";
    $prompt .= "3. Zeit- und Kosteneinsparungspotenzial\n";
    $prompt .= "4. Schritt-für-Schritt Umsetzungsplan\n";
    $prompt .= "Antworte in Deutsch, formell und professionell.\n";
    
    return $prompt;
}

function callAIService(string $prompt, array $config): array {
    // Use your configured endpoint
    $url = $config['base_url'] . $config['responses_path'];
    
    $headers = [
        'Content-Type: application/json',
        $config['project_header'] . ': ' . $config['project_uuid']
    ];
    
    $data = [
        'model' => $config['default_model'],
        'messages' => [
            [
                'role' => 'system',
                'content' => 'Du bist ein KI-Beratungsexperte für kleine und mittlere Unternehmen. Analysiere KI-Readiness-Bewertungen und gebe maßgeschneiderte Empfehlungen.'
            ],
            [
                'role' => 'user',
                'content' => $prompt
            ]
        ],
        'max_tokens' => 2000,
        'temperature' => 0.7
    ];
    
    $ch = curl_init($url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($data));
    curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
    curl_setopt($ch, CURLOPT_TIMEOUT, $config['timeout']);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, $config['verify_tls']);
    
    $response = curl_exec($ch);
    $error = curl_error($ch);
    $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    curl_close($ch);
    
    if ($error) {
        throw new Exception("cURL Error: " . $error);
    }
    
    if ($httpCode !== 200) {
        throw new Exception("API Error: HTTP $httpCode - " . $response);
    }
    
    return json_decode($response, true);
}

function processAIResponse(array $aiResponse, array $answers): array {
    $content = $aiResponse['choices'][0]['message']['content'] ?? '';
    
    // Parse the AI response into structured data
    return [
        'score' => extractScore($content),
        'recommendations' => extractRecommendations($content),
        'time_saving' => calculateTimeSaving($answers),
        'cost_saving' => calculateCostSaving($answers),
        'tools' => extractTools($content),
        'full_analysis' => $content,
        'email' => $answers['q14'] ?? '',
        'company_name' => extractCompanyName($answers),
        'report_id' => generateReportId()
    ];
}

function extractScore(string $content): int {
    preg_match('/Score[\s:]*(\d+)/i', $content, $matches);
    return isset($matches[1]) ? (int)$matches[1] : rand(60, 85);
}

function extractRecommendations(string $content): array {
    $recommendations = [];
    $lines = explode("\n", $content);
    
    foreach ($lines as $line) {
        if (preg_match('/^\d+\.\s+(.+)$/', $line, $matches)) {
            $recommendations[] = $matches[1];
        }
    }
    
    if (empty($recommendations)) {
        return [
            'Beginnen Sie mit einfachen KI-Tools wie ChatGPT für Content-Erstellung',
            'Automatisieren Sie Kundenkommunikation mit Chatbots',
            'Implementieren Sie ein KI-gestütztes CRM-System'
        ];
    }
    
    return array_slice($recommendations, 0, 3);
}

function calculateTimeSaving(array $answers): string {
    if (!isset($answers['q8'])) return '10-20h/Woche';
    
    $map = [
        'unter-5h' => '5-10h/Woche',
        '5-10h' => '10-20h/Woche',
        '11-15h' => '15-25h/Woche',
        '16-20h' => '20-30h/Woche',
        '20plus' => '30-40h/Woche'
    ];
    
    return $map[$answers['q8']] ?? '10-20h/Woche';
}

function calculateCostSaving(array $answers): string {
    if (!isset($answers['q9'])) return '1.000-2.000€/Monat';
    
    $map = [
        'unter-50' => '500-1.000€/Monat',
        '50-100' => '1.000-2.000€/Monat',
        '100-300' => '2.000-3.000€/Monat',
        '300-500' => '3.000-5.000€/Monat',
        '500plus' => '5.000-10.000€/Monat'
    ];
    
    return $map[$answers['q9']] ?? '1.000-2.000€/Monat';
}

function extractTools(string $content): array {
    $tools = [];
    $keywords = ['ChatGPT', 'Zapier', 'Notion', 'Canva', 'Pipedrive', 'QuickBooks', 'Calendly'];
    
    foreach ($keywords as $tool) {
        if (stripos($content, $tool) !== false) {
            $tools[] = $tool;
        }
    }
    
    if (empty($tools)) {
        $tools = ['ChatGPT', 'Zapier', 'Notion AI'];
    }
    
    return array_slice($tools, 0, 3);
}

function extractCompanyName(array $answers): string {
    if (isset($answers['q2']) && !empty($answers['q2'])) {
        return $answers['q2'];
    }
    return 'Ihr Unternehmen';
}

function generateReportId(): string {
    return 'KI-' . date('Ymd') . '-' . strtoupper(substr(md5(uniqid()), 0, 8));
}
?>