<?php
/**
 * Audio Webhook Processor for AI Sound Generation Applications
 * 
 * Adapted from the standardized WebhookProcessor for audio files.
 * This class provides a standardized way to integrate webhook functionality
 * into any application that generates AI audio/sound effects.
 * 
 * Usage:
 * require_once 'webhook_processor_audio.php';
 * $processor = new AudioWebhookProcessor(['webhook_url' => 'https://your-hook.com']);
 * $processor->sendGenerationData($data);
 */

class AudioWebhookProcessor {
    private $config;
    private $defaultWebhookUrl = 'https://hook.us1.make.celonis.com/sbhcpk0athbdbxxmgijxc5sbwtjsg33h';
    
    /**
     * Initialize webhook processor with configuration
     * 
     * @param array $config Configuration options:
     *   - webhook_url: Target webhook URL (optional)
     *   - client: Default client name (optional)
     *   - user_email: Default user email (optional)
     *   - deliverable_number: Default deliverable number (optional)
     *   - timeout: cURL timeout in seconds (default: 30)
     *   - verify_ssl: Whether to verify SSL certificates (default: true)
     */
    public function __construct($config = []) {
        $this->config = array_merge([
            'webhook_url' => $this->defaultWebhookUrl,
            'client' => 'Auto-Approved',
            'user_email' => 'ai-comp-setup@oliver.agency',
            'deliverable_number' => '1000000',
            'timeout' => 30,
            'verify_ssl' => true
        ], $config);
    }
    
    /**
     * Send AI sound generation data to webhook
     * 
     * @param array $data Generation data:
     *   - prompt: The user's text prompt (required)
     *   - generation_type: Type of AI generation (ElevenLabs, etc.)
     *   - settings: Generation settings array (duration, prompt_influence, etc.)
     *   - audio_data: Raw audio binary data OR audio URL OR file path
     *   - audio_url: Alternative to audio_data - URL to download audio
     *   - audio_file: Alternative to audio_data - file path to read audio
     *   - client: Client name (overrides default)
     *   - user_email: User email (overrides default) 
     *   - deliverable_number: Deliverable number (overrides default)
     *   - additional_data: Extra data to include in webhook
     * @param string $webhookUrl Optional webhook URL override
     * @return bool True on success, false on failure
     */
    public function sendGenerationData($data, $webhookUrl = null) {
        $webhookUrl = $webhookUrl ?: $this->config['webhook_url'];
        
        // Build standardized webhook data
        $webhookData = $this->buildWebhookData($data);
        
        // Send the webhook
        return $this->sendWebhook($webhookData, $webhookUrl);
    }
    
    /**
     * Build standardized webhook data structure for audio
     * 
     * @param array $data Input data
     * @return array Standardized webhook data
     */
    private function buildWebhookData($data) {
        $webhookData = [
            'client' => $data['client'] ?? $this->config['client'],
            'deliverableNumber' => $data['deliverable_number'] ?? $this->config['deliverable_number'],
            'userEmail' => $data['user_email'] ?? $this->config['user_email'],
            'generationType' => $data['generation_type'] ?? 'ElevenLabs Sound Effects',
            'settings' => $data['settings'] ?? [],
            'timestamp' => time(),
        ];
        
        // Add prompt to settings if provided
        if (isset($data['prompt'])) {
            $webhookData['settings']['prompt'] = $data['prompt'];
        }
        
        // Process audio data if provided
        if (isset($data['audio_data'])) {
            $normalized = $this->normalizeAudioData($data['audio_data']);
            if ($normalized) {
                $webhookData['audioFile'] = $normalized['base64'];
                $webhookData['audioMimeType'] = $normalized['mime_type'];
            }
        } elseif (isset($data['audio_url'])) {
            $normalized = $this->processAudioUrl($data['audio_url']);
            if ($normalized) {
                $webhookData['audioFile'] = $normalized['base64'];
                $webhookData['audioMimeType'] = $normalized['mime_type'];
            }
        } elseif (isset($data['audio_file'])) {
            $normalized = $this->processAudioFile($data['audio_file']);
            if ($normalized) {
                $webhookData['audioFile'] = $normalized['base64'];
                $webhookData['audioMimeType'] = $normalized['mime_type'];
            }
        }
        
        // Add any additional data
        if (isset($data['additional_data']) && is_array($data['additional_data'])) {
            $webhookData = array_merge($webhookData, $data['additional_data']);
        }
        
        return $webhookData;
    }
    
    /**
     * Normalize audio data to standard format
     * 
     * @param mixed $audioData Raw binary data, base64 string, or data URI
     * @return array|null Normalized audio data or null on failure
     */
    private function normalizeAudioData($audioData) {
        // If already a data URI, extract the data
        if (is_string($audioData) && strpos($audioData, 'data:') === 0) {
            $parts = explode(',', $audioData, 2);
            if (count($parts) === 2) {
                $mimeType = explode(';', explode(':', $parts[0])[1])[0];
                $audioData = base64_decode($parts[1]);
            }
        }
        // If base64 encoded string, decode it
        elseif (is_string($audioData) && base64_decode($audioData, true) !== false) {
            $audioData = base64_decode($audioData);
        }
        
        // Detect mime type
        $finfo = new finfo(FILEINFO_MIME_TYPE);
        $mimeType = $finfo->buffer($audioData);
        
        // Validate that it's an audio file
        if (strpos($mimeType, 'audio/') !== 0) {
            // Try common audio extensions based on magic bytes
            $audioTypes = [
                'audio/mpeg' => ["\xFF\xFB", "\xFF\xF3", "\xFF\xF2"], // MP3
                'audio/wav' => ["RIFF"], // WAV
                'audio/ogg' => ["OggS"], // OGG
                'audio/mp4' => ["\x00\x00\x00"], // M4A/MP4
            ];
            
            foreach ($audioTypes as $type => $signatures) {
                foreach ($signatures as $signature) {
                    if (strpos($audioData, $signature) === 0) {
                        $mimeType = $type;
                        break 2;
                    }
                }
            }
        }
        
        return [
            'mime_type' => $mimeType,
            'base64' => 'data:' . $mimeType . ';base64,' . base64_encode($audioData),
            'data' => $audioData,
            'size' => strlen($audioData)
        ];
    }
    
    /**
     * Process audio from URL
     * 
     * @param string $audioUrl URL to download
     * @return array|null Normalized audio data or null on failure
     */
    private function processAudioUrl($audioUrl) {
        $context = stream_context_create([
            'http' => [
                'timeout' => $this->config['timeout'],
                'user_agent' => 'AudioWebhookProcessor/1.0'
            ]
        ]);
        
        $audioData = @file_get_contents($audioUrl, false, $context);
        
        if ($audioData === false) {
            return null;
        }
        
        return $this->normalizeAudioData($audioData);
    }
    
    /**
     * Process audio from file path
     * 
     * @param string $filePath Path to audio file
     * @return array|null Normalized audio data or null on failure
     */
    private function processAudioFile($filePath) {
        if (!file_exists($filePath)) {
            return null;
        }
        
        $audioData = file_get_contents($filePath);
        
        if ($audioData === false) {
            return null;
        }
        
        return $this->normalizeAudioData($audioData);
    }
    
    /**
     * Send webhook using cURL
     * 
     * @param array $data Data to send
     * @param string $webhookUrl Target URL
     * @return bool True on success, false on failure
     */
    private function sendWebhook($data, $webhookUrl) {
        $ch = curl_init($webhookUrl);
        
        curl_setopt_array($ch, [
            CURLOPT_POST => 1,
            CURLOPT_POSTFIELDS => json_encode($data),
            CURLOPT_HTTPHEADER => ['Content-Type: application/json'],
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_SSL_VERIFYPEER => $this->config['verify_ssl'],
            CURLOPT_TIMEOUT => $this->config['timeout'],
            CURLOPT_USERAGENT => 'AudioWebhookProcessor/1.0'
        ]);
        
        $response = curl_exec($ch);
        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        $curlError = curl_error($ch);
        
        curl_close($ch);
        
        // Log errors if debugging is enabled
        if ($httpCode < 200 || $httpCode >= 300 || !empty($curlError)) {
            error_log("Audio Webhook failed: HTTP {$httpCode}, Error: {$curlError}, URL: {$webhookUrl}");
            return false;
        }
        
        return true;
    }
    
    /**
     * Test webhook endpoint connectivity
     * 
     * @param string $webhookUrl Optional URL to test (uses default if not provided)
     * @return array Test results with status, http_code, and response_time
     */
    public function testWebhook($webhookUrl = null) {
        $webhookUrl = $webhookUrl ?: $this->config['webhook_url'];
        
        $testData = [
            'test' => true,
            'timestamp' => time(),
            'client' => 'AudioWebhookProcessor Test',
            'generationType' => 'ElevenLabs Sound Effects Test',
            'settings' => [
                'prompt' => 'Test sound generation',
                'duration_seconds' => 5.0,
                'prompt_influence' => 0.3
            ]
        ];
        
        $startTime = microtime(true);
        $ch = curl_init($webhookUrl);
        
        curl_setopt_array($ch, [
            CURLOPT_POST => 1,
            CURLOPT_POSTFIELDS => json_encode($testData),
            CURLOPT_HTTPHEADER => ['Content-Type: application/json'],
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_SSL_VERIFYPEER => $this->config['verify_ssl'],
            CURLOPT_TIMEOUT => $this->config['timeout'],
            CURLOPT_USERAGENT => 'AudioWebhookProcessor/1.0 Test'
        ]);
        
        $response = curl_exec($ch);
        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        $curlError = curl_error($ch);
        $responseTime = round((microtime(true) - $startTime) * 1000, 2);
        
        curl_close($ch);
        
        return [
            'success' => ($httpCode >= 200 && $httpCode < 300 && empty($curlError)),
            'http_code' => $httpCode,
            'response_time_ms' => $responseTime,
            'error' => $curlError,
            'response' => $response
        ];
    }
    
    /**
     * Get current configuration
     * 
     * @return array Current configuration (sensitive values masked)
     */
    public function getConfig() {
        $config = $this->config;
        // Mask sensitive webhook URL 
        if (isset($config['webhook_url'])) {
            $config['webhook_url'] = substr($config['webhook_url'], 0, 30) . '...';
        }
        return $config;
    }
    
    /**
     * Update configuration
     * 
     * @param array $newConfig New configuration values
     * @return void
     */
    public function updateConfig($newConfig) {
        $this->config = array_merge($this->config, $newConfig);
    }
}

/**
 * Convenience function for quick audio webhook sending
 * 
 * @param array $data Generation data
 * @param string $webhookUrl Webhook URL
 * @param array $config Optional processor configuration
 * @return bool Success status
 */
function sendAudioWebhook($data, $webhookUrl = null, $config = []) {
    if ($webhookUrl) {
        $config['webhook_url'] = $webhookUrl;
    }
    
    $processor = new AudioWebhookProcessor($config);
    return $processor->sendGenerationData($data);
}
?>