<?php

namespace App\Services;

class GeminiService
{
    /**
     * Call Gemini API to generate a response
     */
    public static function generateResponse(string $apiKey, string $systemPrompt, string $userMessage): ?string
    {
        $url = 'https://generativelanguage.googleapis.com/v1beta/models/gemini-flash-lite-latest:generateContent?key=' . $apiKey;

        $payload = json_encode([
            'contents' => [
                [
                    'role' => 'user',
                    'parts' => [
                        ['text' => $userMessage]
                    ]
                ]
            ],
            'systemInstruction' => [
                'parts' => [
                    ['text' => $systemPrompt]
                ]
            ]
        ]);

        $ch = curl_init($url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_POST, true);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $payload);
        curl_setopt($ch, CURLOPT_HTTPHEADER, [
            'Content-Type: application/json'
        ]);
        curl_setopt($ch, CURLOPT_TIMEOUT, 15);

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

        if ($httpCode !== 200) {
            error_log("[Gemini API Error] HTTP " . $httpCode . " | Response: " . $response);
            return null;
        }

        $data = json_decode($response, true);
        return $data['candidates'][0]['content']['parts'][0]['text'] ?? null;
    }

    /**
     * Call Gemini API with audio inline data to generate a chatbot prompt
     */
    public static function generatePromptFromAudio(string $apiKey, string $audioBase64, string $mimeType): ?string
    {
        $url = 'https://generativelanguage.googleapis.com/v1beta/models/gemini-flash-lite-latest:generateContent?key=' . $apiKey;

        $payload = json_encode([
            'contents' => [
                [
                    'role' => 'user',
                    'parts' => [
                        [
                            'inlineData' => [
                                'mimeType' => $mimeType,
                                'data' => $audioBase64
                            ]
                        ],
                        [
                            'text' => "أنت خبير محترف في هندسة التعليمات (Prompt Engineering). استمع جيداً للتسجيل الصوتي المرفق الذي يصف متجراً أو مشروعاً تجارياً ومتطلبات خدمة العملاء، واستخرج التفاصيل المهمة (اسم المتجر، الخدمات، اللهجة المطلوبة، ساعات العمل، سياسات الشحن والاستبدال، والأسئلة الشائعة). ثم قم بصياغة تعليمة نظام (System Instruction Prompt) مفصلة ومنظمة وعالية الجودة باللغة العربية لروبوت خدمة العملاء المعتمد على الذكاء الاصطناعي. يجب أن ترشد التعليمة الروبوت بكيفية التصرف والرد بنبرة مناسبة. أرجع فقط تعليمة النظام الناتجة مباشرة بدون أي نصوص تمهيدية أو تنسيقات markdown أو علامات اقتباس برمجية."
                        ]
                    ]
                ]
            ]
        ]);

        $ch = curl_init($url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_POST, true);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $payload);
        curl_setopt($ch, CURLOPT_HTTPHEADER, [
            'Content-Type: application/json'
        ]);
        curl_setopt($ch, CURLOPT_TIMEOUT, 35); // 35 seconds timeout for audio analysis

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

        if ($httpCode !== 200) {
            error_log("[Gemini Audio API Error] HTTP " . $httpCode . " | Response: " . $response);
            return null;
        }

        $data = json_decode($response, true);
        return $data['candidates'][0]['content']['parts'][0]['text'] ?? null;
    }

    /**
     * Call Gemini API with audio inline data and system instruction to generate a response text
     */
    public static function generateResponseFromAudio(string $apiKey, string $systemPrompt, string $audioBase64, string $mimeType): ?string
    {
        $url = 'https://generativelanguage.googleapis.com/v1beta/models/gemini-flash-lite-latest:generateContent?key=' . $apiKey;

        // Clean mimeType if it contains codec info
        if (strpos($mimeType, ';') !== false) {
            $mimeType = trim(explode(';', $mimeType)[0]);
        }

        $payload = json_encode([
            'contents' => [
                [
                    'role' => 'user',
                    'parts' => [
                        [
                            'inlineData' => [
                                'mimeType' => $mimeType,
                                'data' => $audioBase64
                            ]
                        ],
                        [
                            'text' => "استمع إلى التسجيل الصوتي المرفق وأجب عليه مباشرة باللغة المناسبة بناءً على الإرشادات المحددة."
                        ]
                    ]
                ]
            ],
            'systemInstruction' => [
                'parts' => [
                    ['text' => $systemPrompt]
                ]
            ]
        ]);

        $ch = curl_init($url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_POST, true);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $payload);
        curl_setopt($ch, CURLOPT_HTTPHEADER, [
            'Content-Type: application/json'
        ]);
        curl_setopt($ch, CURLOPT_TIMEOUT, 35); // 35 seconds timeout for audio analysis

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

        if ($httpCode !== 200) {
            error_log("[Gemini Audio Response Error] HTTP " . $httpCode . " | Response: " . $response);
            return null;
        }

        $data = json_decode($response, true);
        return $data['candidates'][0]['content']['parts'][0]['text'] ?? null;
    }

    /**
     * Call Gemini API with image inline data and system instruction to generate a response text
     */
    public static function generateResponseFromImage(string $apiKey, string $systemPrompt, string $imageBase64, string $mimeType): ?string
    {
        $url = 'https://generativelanguage.googleapis.com/v1beta/models/gemini-flash-lite-latest:generateContent?key=' . $apiKey;

        // Clean mimeType if it contains codec info
        if (strpos($mimeType, ';') !== false) {
            $mimeType = trim(explode(';', $mimeType)[0]);
        }

        $payload = json_encode([
            'contents' => [
                [
                    'role' => 'user',
                    'parts' => [
                        [
                            'inlineData' => [
                                'mimeType' => $mimeType,
                                'data' => $imageBase64
                            ]
                        ],
                        [
                            'text' => "حلل الصورة المرفقة وأجب عليها باللغة المناسبة بناءً على الإرشادات المحددة."
                        ]
                    ]
                ]
            ],
            'systemInstruction' => [
                'parts' => [
                    ['text' => $systemPrompt]
                ]
            ]
        ]);

        $ch = curl_init($url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_POST, true);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $payload);
        curl_setopt($ch, CURLOPT_HTTPHEADER, [
            'Content-Type: application/json'
        ]);
        curl_setopt($ch, CURLOPT_TIMEOUT, 35); // 35 seconds timeout for image analysis

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

        if ($httpCode !== 200) {
            error_log("[Gemini Image Response Error] HTTP " . $httpCode . " | Response: " . $response);
            return null;
        }

        $data = json_decode($response, true);
        return $data['candidates'][0]['content']['parts'][0]['text'] ?? null;
    }

    /**
     * Call Gemini API to generate a native audio (speech) response from text
     */
    public static function generateAudioResponse(string $apiKey, string $systemPrompt, string $userMessage, string $voiceName = 'Puck'): ?array
    {
        $url = 'https://generativelanguage.googleapis.com/v1beta/models/gemini-flash-lite-latest:generateContent?key=' . $apiKey;

        $payload = json_encode([
            'contents' => [
                [
                    'role' => 'user',
                    'parts' => [
                        ['text' => $userMessage]
                    ]
                ]
            ],
            'systemInstruction' => [
                'parts' => [
                    ['text' => $systemPrompt]
                ]
            ],
            'generationConfig' => [
                'responseModalities' => ['AUDIO'],
                'speechConfig' => [
                    'voiceConfig' => [
                        'prebuiltVoiceConfig' => [
                            'voiceName' => $voiceName
                        ]
                    ]
                ]
            ]
        ]);

        $ch = curl_init($url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_POST, true);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $payload);
        curl_setopt($ch, CURLOPT_HTTPHEADER, [
            'Content-Type: application/json'
        ]);
        curl_setopt($ch, CURLOPT_TIMEOUT, 30);

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

        if ($httpCode !== 200) {
            error_log("[Gemini Audio API Error] HTTP " . $httpCode . " | Response: " . $response);
            return null;
        }

        $data = json_decode($response, true);
        $part = $data['candidates'][0]['content']['parts'][0] ?? null;
        if ($part && isset($part['inlineData'])) {
            return [
                'audio' => $part['inlineData']['data'],
                'mimeType' => $part['inlineData']['mimeType'] ?? 'audio/mp4'
            ];
        }
        return null;
    }

    /**
     * Call Gemini API with audio inline data to generate a native audio response
     */
    public static function generateAudioResponseFromAudio(string $apiKey, string $systemPrompt, string $audioBase64, string $mimeType, string $voiceName = 'Puck'): ?array
    {
        $url = 'https://generativelanguage.googleapis.com/v1beta/models/gemini-flash-lite-latest:generateContent?key=' . $apiKey;

        if (strpos($mimeType, ';') !== false) {
            $mimeType = trim(explode(';', $mimeType)[0]);
        }

        $payload = json_encode([
            'contents' => [
                [
                    'role' => 'user',
                    'parts' => [
                        [
                            'inlineData' => [
                                'mimeType' => $mimeType,
                                'data' => $audioBase64
                            ]
                        ],
                        [
                            'text' => "استمع إلى التسجيل الصوتي المرفق وأجب عليه مباشرة بصوتك بناءً على الإرشادات المحددة."
                        ]
                    ]
                ]
            ],
            'systemInstruction' => [
                'parts' => [
                    ['text' => $systemPrompt]
                ]
            ],
            'generationConfig' => [
                'responseModalities' => ['AUDIO'],
                'speechConfig' => [
                    'voiceConfig' => [
                        'prebuiltVoiceConfig' => [
                            'voiceName' => $voiceName
                        ]
                    ]
                ]
            ]
        ]);

        $ch = curl_init($url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_POST, true);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $payload);
        curl_setopt($ch, CURLOPT_HTTPHEADER, [
            'Content-Type: application/json'
        ]);
        curl_setopt($ch, CURLOPT_TIMEOUT, 45); // 45 seconds timeout for audio-to-audio generation

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

        if ($httpCode !== 200) {
            error_log("[Gemini Audio-to-Audio Response Error] HTTP " . $httpCode . " | Response: " . $response);
            return null;
        }

        $data = json_decode($response, true);
        $part = $data['candidates'][0]['content']['parts'][0] ?? null;
        if ($part && isset($part['inlineData'])) {
            return [
                'audio' => $part['inlineData']['data'],
                'mimeType' => $part['inlineData']['mimeType'] ?? 'audio/mp4'
            ];
        }
        return null;
    }
}