// ============================================================
// USER PREFERENCES — STT model & TTS voice selection
// ============================================================

var express = require('express');
var router = express.Router();
var db = require('../db/database');
var { authMiddleware } = require('../middleware/auth');

router.use(authMiddleware);

// Get current user's STT/TTS preferences
router.get('/preferences', async function(req, res) {
  try {
    var user = await db.get('SELECT stt_model, tts_voice FROM users WHERE id = ?', [req.user.id]);
    res.json({
      success: true,
      stt_model: user?.stt_model || null,
      tts_voice: user?.tts_voice || null
    });
  } catch (err) {
    console.error('[Preferences]', err.message);
    res.status(500).json({ error: err.message });
  }
});

// Update user's STT/TTS preferences
router.post('/preferences', async function(req, res) {
  try {
    var { stt_model, tts_voice } = req.body;

    await db.run(
      'UPDATE users SET stt_model = ?, tts_voice = ? WHERE id = ?',
      [stt_model || null, tts_voice || null, req.user.id]
    );

    res.json({ success: true });
  } catch (err) {
    console.error('[Preferences]', err.message);
    res.status(500).json({ error: err.message });
  }
});

// Get available STT models and TTS voices
router.get('/preferences/options', async function(req, res) {
  try {
    var provider = process.env.TRANSCRIBE_PROVIDER;
    var ttsProvider = process.env.TTS_PROVIDER;

    // Auto-detect providers if not explicitly set
    if (!provider) {
      if (process.env.VERTEX_PROJECT || process.env.GOOGLE_CLOUD_PROJECT) provider = 'google';
      else if (process.env.AWS_BEDROCK_REGION) provider = 'aws';
      else if (process.env.LITELLM_API_BASE) provider = 'litellm';
      else if (process.env.OPENAI_API_KEY) provider = 'openai';
    }

    if (!ttsProvider) {
      if (process.env.VERTEX_PROJECT || process.env.GOOGLE_CLOUD_PROJECT) ttsProvider = 'google';
      else if (process.env.LITELLM_API_BASE) ttsProvider = 'litellm';
      else if (process.env.OPENAI_API_KEY) ttsProvider = 'openai';
      else if (process.env.ELEVENLABS_API_KEY) ttsProvider = 'elevenlabs';
    }

    // STT Models
    var sttModels = [];
    if (provider === 'google') {
      sttModels = [
        { value: 'gemini-2.0-flash-exp', label: 'Gemini 2.0 Flash (Experimental, fastest)' },
        { value: 'gemini-2.0-flash', label: 'Gemini 2.0 Flash (Fast, accurate)' },
        { value: 'gemini-1.5-flash', label: 'Gemini 1.5 Flash (Stable)' },
        { value: 'gemini-1.5-pro', label: 'Gemini 1.5 Pro (Best quality, slower)' }
      ];
    } else if (provider === 'litellm') {
      sttModels = [
        { value: 'gemini-2.0-flash-exp', label: 'Gemini 2.0 Flash Exp' },
        { value: 'gemini-2.0-flash', label: 'Gemini 2.0 Flash' },
        { value: 'gemini-1.5-flash', label: 'Gemini 1.5 Flash' },
        { value: 'gemini-1.5-pro', label: 'Gemini 1.5 Pro' },
        { value: 'whisper-1', label: 'OpenAI Whisper-1' },
        { value: 'whisper-large-v3', label: 'Whisper Large v3' }
      ];
    } else if (provider === 'openai') {
      sttModels = [
        { value: 'whisper-1', label: 'Whisper-1 (OpenAI standard)' }
      ];
    } else if (provider === 'aws') {
      sttModels = [
        { value: 'default', label: 'AWS Transcribe (Standard)' },
        { value: 'medical', label: 'AWS Transcribe Medical' }
      ];
    } else if (provider === 'local') {
      sttModels = [
        { value: 'tiny', label: 'Whisper Tiny (fastest)' },
        { value: 'base', label: 'Whisper Base' },
        { value: 'small', label: 'Whisper Small' },
        { value: 'medium', label: 'Whisper Medium' },
        { value: 'large', label: 'Whisper Large (best quality)' }
      ];
    }

    // TTS Voices
    var ttsVoices = [];
    if (ttsProvider === 'google') {
      ttsVoices = [
        { value: 'en-US-Journey-F', label: 'Journey (Female, natural)' },
        { value: 'en-US-Journey-D', label: 'Journey (Male, natural)' },
        { value: 'en-US-Studio-O', label: 'Studio O (Female, expressive)' },
        { value: 'en-US-Studio-M', label: 'Studio M (Male, expressive)' },
        { value: 'en-US-Neural2-A', label: 'Neural2 A (Male, standard)' },
        { value: 'en-US-Neural2-C', label: 'Neural2 C (Female, standard)' },
        { value: 'en-US-Neural2-D', label: 'Neural2 D (Male, standard)' },
        { value: 'en-US-Neural2-E', label: 'Neural2 E (Female, standard)' },
        { value: 'en-US-Neural2-F', label: 'Neural2 F (Female, standard)' },
        { value: 'en-US-Neural2-G', label: 'Neural2 G (Female, standard)' },
        { value: 'en-US-Neural2-H', label: 'Neural2 H (Female, standard)' },
        { value: 'en-US-Neural2-I', label: 'Neural2 I (Male, standard)' },
        { value: 'en-US-Neural2-J', label: 'Neural2 J (Male, standard)' }
      ];
    } else if (ttsProvider === 'litellm' || ttsProvider === 'openai') {
      ttsVoices = [
        { value: 'alloy', label: 'Alloy (Neutral)' },
        { value: 'echo', label: 'Echo (Male)' },
        { value: 'fable', label: 'Fable (British Male)' },
        { value: 'onyx', label: 'Onyx (Deep Male)' },
        { value: 'nova', label: 'Nova (Female)' },
        { value: 'shimmer', label: 'Shimmer (Soft Female)' }
      ];
    } else if (ttsProvider === 'elevenlabs') {
      ttsVoices = [
        { value: 'adam', label: 'Adam (Male, deep)' },
        { value: 'rachel', label: 'Rachel (Female, calm)' },
        { value: 'domi', label: 'Domi (Female, strong)' },
        { value: 'bella', label: 'Bella (Female, soft)' },
        { value: 'antoni', label: 'Antoni (Male, deep)' },
        { value: 'elli', label: 'Elli (Female, young)' },
        { value: 'josh', label: 'Josh (Male, narration)' },
        { value: 'arnold', label: 'Arnold (Male, crisp)' },
        { value: 'sam', label: 'Sam (Male, raspy)' }
      ];
    }

    res.json({
      success: true,
      sttProvider: provider || 'none',
      sttModels: sttModels,
      ttsProvider: ttsProvider || 'browser',
      ttsVoices: ttsVoices
    });

  } catch (err) {
    console.error('[Preferences]', err.message);
    res.status(500).json({ error: err.message });
  }
});

module.exports = router;