<?php

namespace App\Controllers;

use App\Core\Request;
use App\Core\Response;
use App\Models\ChatbotRule;

class ChatbotController extends BaseController
{
    /**
     * Get chatbot rules for the company
     */
    public function index(Request $request, Response $response)
    {
        $rules = ChatbotRule::findAllByCompany($request->company_id);
        
        $response->json([
            'status' => 'success',
            'data' => $rules
        ]);
    }

    /**
     * Store or update a chatbot rule
     */
    public function store(Request $request, Response $response)
    {
        $errors = $this->validate($request, [
            'trigger_type' => 'required',
            'is_active' => 'required'
        ]);

        if (!empty($errors)) {
            $response->status(400)->json(['status' => 'error', 'errors' => $errors]);
            return;
        }

        $body = $request->getBody();
        
        // Find existing rule or create one
        $rules = ChatbotRule::findAllByCompany($request->company_id);
        $ruleId = null;
        if (!empty($rules)) {
            $ruleId = $rules[0]['id'];
        }

        $saveData = [
            'company_id' => $request->company_id,
            'session_id' => !empty($body['session_id']) ? (int)$body['session_id'] : null,
            'trigger_type' => $body['trigger_type'],
            'keyword' => $body['keyword'] ?? null,
            'ai_prompt' => $body['ai_prompt'] ?? null,
            'is_active' => $body['is_active'] ? 1 : 0
        ];

        if ($ruleId) {
            $saveData['id'] = $ruleId;
        }

        // If gemini_api_key is provided, update it. If not, and we have an existing rule, retain it.
        // If it's a password placeholder like '••••••••' or similar, don't overwrite the existing one.
        if (isset($body['gemini_api_key']) && $body['gemini_api_key'] !== '••••••••' && $body['gemini_api_key'] !== '') {
            $saveData['gemini_api_key'] = $body['gemini_api_key'];
        }

        $id = ChatbotRule::saveSecure($saveData);

        $response->json([
            'status' => 'success',
            'message' => 'Chatbot rule saved successfully',
            'id' => $id
        ]);
    }

    /**
     * Generate prompt from voice recording using Gemini audio input
     */
    public function generatePromptFromAudio(Request $request, Response $response)
    {
        // 1. Get the uploaded audio file
        $files = $_FILES;
        if (empty($files['audio']) || $files['audio']['error'] !== UPLOAD_ERR_OK) {
            $response->status(400)->json(['status' => 'error', 'message' => 'Missing or invalid audio file upload']);
            return;
        }

        $audioFile = $files['audio'];
        
        // 2. Validate file size (max 10MB)
        if ($audioFile['size'] > 10 * 1024 * 1024) {
            $response->status(400)->json(['status' => 'error', 'message' => 'Audio file size exceeds limit (10MB)']);
            return;
        }

        // 3. Read the audio content and base64 encode
        $audioContent = file_get_contents($audioFile['tmp_name']);
        if ($audioContent === false) {
            $response->status(500)->json(['status' => 'error', 'message' => 'Failed to read uploaded audio file']);
            return;
        }
        $audioBase64 = base64_encode($audioContent);
        $mimeType = $audioFile['type'] ?: 'audio/webm'; // fallback
        // Normalize mime type (e.g. "audio/webm;codecs=opus" -> "audio/webm") for Gemini API compatibility
        if (strpos($mimeType, ';') !== false) {
            $mimeType = trim(explode(';', $mimeType)[0]);
        }

        // 4. Retrieve the Gemini API key (custom or system default)
        $rules = ChatbotRule::findAllByCompany($request->company_id);
        $apiKey = null;
        if (!empty($rules) && !empty($rules[0]['gemini_api_key'])) {
            $apiKey = $rules[0]['gemini_api_key'];
        }
        
        $apiKey = $apiKey ?: getenv('GEMINI_API_KEY');
        
        if (empty($apiKey)) {
            $response->status(500)->json(['status' => 'error', 'message' => 'Gemini API Key is not configured in the system']);
            return;
        }

        // 5. Call Gemini Service
        $generatedPrompt = \App\Services\GeminiService::generatePromptFromAudio($apiKey, $audioBase64, $mimeType);

        if (empty($generatedPrompt)) {
            $response->status(500)->json(['status' => 'error', 'message' => 'Failed to generate prompt from audio. Please check Gemini logs.']);
            return;
        }

        $response->json([
            'status' => 'success',
            'prompt' => trim($generatedPrompt)
        ]);
    }
}