<?php

namespace App\Services\AI;

use Illuminate\Support\Facades\Http;
use Illuminate\Support\Facades\Log;
use Illuminate\Support\Facades\Storage;

class VoiceService
{
    private $sttProvider;
    private $ttsProvider;
    private $sttModel;
    private $ttsVoice;

    public function __construct()
    {
        $this->sttProvider = config('ai.voice.speech_to_text.provider', 'local');
        $this->ttsProvider = config('ai.voice.text_to_speech.provider', 'local');
        $this->sttModel = config('ai.voice.speech_to_text.model', 'whisper-1');
        $this->ttsVoice = config('ai.voice.text_to_speech.voice', 'default');
    }

    /**
     * Convert speech to text
     */
    public function speechToText(string $audioPath, string $language = 'en-US'): array
    {
        try {
            switch ($this->sttProvider) {
                case 'local':
                    return $this->localSpeechToText($audioPath, $language);
                case 'azure':
                    return $this->azureSpeechToText($audioPath, $language);
                case 'google':
                    return $this->googleSpeechToText($audioPath, $language);
                default:
                    return $this->localSpeechToText($audioPath, $language);
            }
        } catch (\Exception $e) {
            Log::error('Speech to text error: ' . $e->getMessage());
            return [
                'success' => false,
                'error' => 'Speech to text failed: ' . $e->getMessage()
            ];
        }
    }

    /**
     * Convert text to speech
     */
    public function textToSpeech(string $text, string $voice = null, string $language = 'en-US'): array
    {
        try {
            $voice = $voice ?? $this->ttsVoice;
            
            switch ($this->ttsProvider) {
                case 'local':
                    return $this->localTextToSpeech($text, $voice, $language);
                case 'azure':
                    return $this->azureTextToSpeech($text, $voice, $language);
                case 'google':
                    return $this->googleTextToSpeech($text, $voice, $language);
                default:
                    return $this->localTextToSpeech($text, $voice, $language);
            }
        } catch (\Exception $e) {
            Log::error('Text to speech error: ' . $e->getMessage());
            return [
                'success' => false,
                'error' => 'Text to speech failed: ' . $e->getMessage()
            ];
        }
    }

    /**
     * Local speech to text using Whisper
     */
    private function localSpeechToText(string $audioPath, string $language): array
    {
        // This would integrate with a local Whisper installation
        // For now, return a mock response
        return [
            'success' => true,
            'text' => 'This is a mock transcription of the audio file.',
            'confidence' => 0.95,
            'language' => $language,
            'duration' => 5.2
        ];
    }

    /**
     * Local text to speech
     */
    private function localTextToSpeech(string $text, string $voice, string $language): array
    {
        // This would integrate with a local TTS engine like espeak or festival
        // For now, return a mock response
        $audioPath = 'ai/audio/' . uniqid() . '.wav';
        
        return [
            'success' => true,
            'audio_path' => $audioPath,
            'duration' => strlen($text) * 0.1, // Rough estimate
            'voice' => $voice,
            'language' => $language
        ];
    }

    /**
     * Azure Speech to Text
     */
    private function azureSpeechToText(string $audioPath, string $language): array
    {
        $apiKey = config('services.azure.speech.key');
        $region = config('services.azure.speech.region');
        
        if (!$apiKey || !$region) {
            return [
                'success' => false,
                'error' => 'Azure Speech API not configured'
            ];
        }

        // Implementation would go here
        return [
            'success' => false,
            'error' => 'Azure Speech to Text not implemented yet'
        ];
    }

    /**
     * Azure Text to Speech
     */
    private function azureTextToSpeech(string $text, string $voice, string $language): array
    {
        $apiKey = config('services.azure.speech.key');
        $region = config('services.azure.speech.region');
        
        if (!$apiKey || !$region) {
            return [
                'success' => false,
                'error' => 'Azure Speech API not configured'
            ];
        }

        // Implementation would go here
        return [
            'success' => false,
            'error' => 'Azure Text to Speech not implemented yet'
        ];
    }

    /**
     * Google Speech to Text
     */
    private function googleSpeechToText(string $audioPath, string $language): array
    {
        $apiKey = config('services.google.speech.key');
        
        if (!$apiKey) {
            return [
                'success' => false,
                'error' => 'Google Speech API not configured'
            ];
        }

        // Implementation would go here
        return [
            'success' => false,
            'error' => 'Google Speech to Text not implemented yet'
        ];
    }

    /**
     * Google Text to Speech
     */
    private function googleTextToSpeech(string $text, string $voice, string $language): array
    {
        $apiKey = config('services.google.speech.key');
        
        if (!$apiKey) {
            return [
                'success' => false,
                'error' => 'Google Speech API not configured'
            ];
        }

        // Implementation would go here
        return [
            'success' => false,
            'error' => 'Google Text to Speech not implemented yet'
        ];
    }

    /**
     * Process audio file for AI analysis
     */
    public function processAudioForAI(string $audioPath): array
    {
        // Convert speech to text
        $sttResult = $this->speechToText($audioPath);
        
        if (!$sttResult['success']) {
            return $sttResult;
        }

        // Analyze the transcribed text
        $phi3Service = app(Phi3Service::class);
        $sentiment = $phi3Service->analyzeSentiment($sttResult['text']);
        $insights = $phi3Service->extractInsights($sttResult['text']);

        return [
            'success' => true,
            'transcription' => $sttResult,
            'sentiment' => $sentiment,
            'insights' => $insights
        ];
    }

    /**
     * Generate AI response as audio
     */
    public function generateAudioResponse(string $text, string $voice = null): array
    {
        $ttsResult = $this->textToSpeech($text, $voice);
        
        if (!$ttsResult['success']) {
            return $ttsResult;
        }

        return [
            'success' => true,
            'audio_path' => $ttsResult['audio_path'],
            'duration' => $ttsResult['duration'],
            'voice' => $ttsResult['voice']
        ];
    }

    /**
     * Get available voices
     */
    public function getAvailableVoices(): array
    {
        $voices = [
            'en-US' => [
                'male' => ['en-US-GuyNeural', 'en-US-DavisNeural'],
                'female' => ['en-US-AriaNeural', 'en-US-JennyNeural', 'en-US-SaraNeural']
            ],
            'en-GB' => [
                'male' => ['en-GB-RyanNeural', 'en-GB-ThomasNeural'],
                'female' => ['en-GB-SoniaNeural', 'en-GB-LibbyNeural']
            ]
        ];

        return $voices;
    }

    /**
     * Test voice service connection
     */
    public function testConnection(): array
    {
        try {
            // Test with a simple text
            $testText = "Hello, this is a test of the voice service.";
            $result = $this->textToSpeech($testText);
            
            return [
                'success' => $result['success'],
                'message' => $result['success'] ? 'Voice service is working' : 'Voice service is not responding',
                'details' => $result
            ];
        } catch (\Exception $e) {
            return [
                'success' => false,
                'message' => 'Voice service test failed',
                'error' => $e->getMessage()
            ];
        }
    }
}
