studyArena/components/settings/tts-settings.tsx

'use client';

import { useState, useEffect } from 'react';
import { Label } from '@/components/ui/label';
import { Input } from '@/components/ui/input';
import { Button } from '@/components/ui/button';
import { useI18n } from '@/lib/hooks/use-i18n';
import { useSettingsStore } from '@/lib/store/settings';
import { TTS_PROVIDERS, DEFAULT_TTS_VOICES } from '@/lib/audio/constants';
import type { TTSProviderId } from '@/lib/audio/types';
import { Volume2, Loader2, CheckCircle2, XCircle, Eye, EyeOff } from 'lucide-react';
import { cn } from '@/lib/utils';
import { createLogger } from '@/lib/logger';
import { useTTSPreview } from '@/lib/audio/use-tts-preview';

const log = createLogger('TTSSettings');

interface TTSSettingsProps {
  selectedProviderId: TTSProviderId;
}

export function TTSSettings({ selectedProviderId }: TTSSettingsProps) {
  const { t } = useI18n();

  const ttsVoice = useSettingsStore((state) => state.ttsVoice);
  const ttsSpeed = useSettingsStore((state) => state.ttsSpeed);
  const ttsProvidersConfig = useSettingsStore((state) => state.ttsProvidersConfig);
  const setTTSProviderConfig = useSettingsStore((state) => state.setTTSProviderConfig);
  const activeProviderId = useSettingsStore((state) => state.ttsProviderId);

  // When testing a non-active provider, use that provider's default voice
  // instead of the active provider's voice (which may be incompatible)
  const effectiveVoice =
    selectedProviderId === activeProviderId
      ? ttsVoice
      : DEFAULT_TTS_VOICES[selectedProviderId] || 'default';

  const ttsProvider = TTS_PROVIDERS[selectedProviderId] ?? TTS_PROVIDERS['openai-tts'];
  const isServerConfigured = !!ttsProvidersConfig[selectedProviderId]?.isServerConfigured;

  const [showApiKey, setShowApiKey] = useState(false);
  const [testText, setTestText] = useState(t('settings.ttsTestTextDefault'));
  const [testStatus, setTestStatus] = useState<'idle' | 'testing' | 'success' | 'error'>('idle');
  const [testMessage, setTestMessage] = useState('');
  const { previewing: testingTTS, startPreview, stopPreview } = useTTSPreview();

  // Update test text when language changes
  useEffect(() => {
    setTestText(t('settings.ttsTestTextDefault'));
  }, [t]);

  // Reset state when provider changes
  useEffect(() => {
    stopPreview();
    setShowApiKey(false);
    setTestStatus('idle');
    setTestMessage('');
  }, [selectedProviderId, stopPreview]);

  const handleTestTTS = async () => {
    if (!testText.trim()) return;

    setTestStatus('testing');
    setTestMessage('');

    try {
      await startPreview({
        text: testText,
        providerId: selectedProviderId,
        voice: effectiveVoice,
        speed: ttsSpeed,
        apiKey: ttsProvidersConfig[selectedProviderId]?.apiKey,
        baseUrl: ttsProvidersConfig[selectedProviderId]?.baseUrl,
      });
      setTestStatus('success');
      setTestMessage(t('settings.ttsTestSuccess'));
    } catch (error) {
      log.error('TTS test failed:', error);
      setTestStatus('error');
      setTestMessage(
        error instanceof Error && error.message
          ? `${t('settings.ttsTestFailed')}: ${error.message}`
          : t('settings.ttsTestFailed'),
      );
    }
  };

  return (
    <div className="space-y-6 max-w-3xl">
      {/* Server-configured notice */}
      {isServerConfigured && (
        <div className="rounded-lg border border-blue-200 bg-blue-50 dark:border-blue-800 dark:bg-blue-950/30 p-3 text-sm text-blue-700 dark:text-blue-300">
          {t('settings.serverConfiguredNotice')}
        </div>
      )}

      {/* API Key & Base URL */}
      {(ttsProvider.requiresApiKey || isServerConfigured) && (
        <>
          <div className="grid grid-cols-2 gap-4">
            <div className="space-y-2">
              <Label className="text-sm">{t('settings.ttsApiKey')}</Label>
              <div className="relative">
                <Input
                  name={`tts-api-key-${selectedProviderId}`}
                  type={showApiKey ? 'text' : 'password'}
                  autoComplete="new-password"
                  autoCapitalize="none"
                  autoCorrect="off"
                  spellCheck={false}
                  placeholder={
                    isServerConfigured ? t('settings.optionalOverride') : t('settings.enterApiKey')
                  }
                  value={ttsProvidersConfig[selectedProviderId]?.apiKey || ''}
                  onChange={(e) =>
                    setTTSProviderConfig(selectedProviderId, {
                      apiKey: e.target.value,
                    })
                  }
                  className="font-mono text-sm pr-10"
                />
                <button
                  type="button"
                  onClick={() => setShowApiKey(!showApiKey)}
                  className="absolute right-2 top-1/2 -translate-y-1/2 text-muted-foreground hover:text-foreground"
                >
                  {showApiKey ? <EyeOff className="h-4 w-4" /> : <Eye className="h-4 w-4" />}
                </button>
              </div>
            </div>
            <div className="space-y-2">
              <Label className="text-sm">{t('settings.ttsBaseUrl')}</Label>
              <Input
                name={`tts-base-url-${selectedProviderId}`}
                autoComplete="off"
                autoCapitalize="none"
                autoCorrect="off"
                spellCheck={false}
                placeholder={ttsProvider.defaultBaseUrl || t('settings.enterCustomBaseUrl')}
                value={ttsProvidersConfig[selectedProviderId]?.baseUrl || ''}
                onChange={(e) =>
                  setTTSProviderConfig(selectedProviderId, {
                    baseUrl: e.target.value,
                  })
                }
                className="text-sm"
              />
            </div>
          </div>
          {/* Request URL Preview */}
          {(() => {
            const effectiveBaseUrl =
              ttsProvidersConfig[selectedProviderId]?.baseUrl || ttsProvider.defaultBaseUrl || '';
            if (!effectiveBaseUrl) return null;
            let endpointPath = '';
            switch (selectedProviderId) {
              case 'openai-tts':
              case 'glm-tts':
                endpointPath = '/audio/speech';
                break;
              case 'azure-tts':
                endpointPath = '/cognitiveservices/v1';
                break;
              case 'qwen-tts':
                endpointPath = '/services/aigc/multimodal-generation/generation';
                break;
            }
            if (!endpointPath) return null;
            return (
              <p className="text-xs text-muted-foreground break-all">
                {t('settings.requestUrl')}: {effectiveBaseUrl + endpointPath}
              </p>
            );
          })()}
        </>
      )}

      {/* Test TTS */}
      <div className="space-y-2">
        <Label className="text-sm">{t('settings.testTTS')}</Label>
        <div className="flex gap-2">
          <Input
            placeholder={t('settings.ttsTestTextPlaceholder')}
            value={testText}
            onChange={(e) => setTestText(e.target.value)}
            className="flex-1"
          />
          <Button
            onClick={handleTestTTS}
            disabled={
              testingTTS ||
              !testText.trim() ||
              (ttsProvider.requiresApiKey &&
                !ttsProvidersConfig[selectedProviderId]?.apiKey?.trim() &&
                !isServerConfigured)
            }
            size="default"
            className="gap-2 w-32"
          >
            {testingTTS ? (
              <Loader2 className="h-4 w-4 animate-spin" />
            ) : (
              <Volume2 className="h-4 w-4" />
            )}
            {t('settings.testTTS')}
          </Button>
        </div>
      </div>

      {testMessage && (
        <div
          className={cn(
            'rounded-lg p-3 text-sm overflow-hidden',
            testStatus === 'success' &&
              'bg-green-50 text-green-700 border border-green-200 dark:bg-green-950/50 dark:text-green-400 dark:border-green-800',
            testStatus === 'error' &&
              'bg-red-50 text-red-700 border border-red-200 dark:bg-red-950/50 dark:text-red-400 dark:border-red-800',
          )}
        >
          <div className="flex items-start gap-2 min-w-0">
            {testStatus === 'success' && <CheckCircle2 className="h-4 w-4 mt-0.5 shrink-0" />}
            {testStatus === 'error' && <XCircle className="h-4 w-4 mt-0.5 shrink-0" />}
            <p className="flex-1 min-w-0 break-all">{testMessage}</p>
          </div>
        </div>
      )}
    </div>
  );
}