import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:get/get.dart';
import 'package:get_storage/get_storage.dart';

import '../../../data/services/volcano_translation_service.dart';
import '../../../data/services/language_manager.dart';
import '../../../core/utils/logger.dart';

/// 文本翻译控制器
class TextTranslationController extends GetxController {
  // 依赖服务
  final VolcanoTranslationService _translationService =
      Get.find<VolcanoTranslationService>();
  final LanguageManager _languageManager = Get.find<LanguageManager>();
  final GetStorage _storage = GetStorage();

  // 文本输入控制器
  final TextEditingController textController = TextEditingController();

  // 响应式状态
  final sourceLanguageChineseName = '中文(简体)'.obs;
  final targetLanguageChineseName = '英语'.obs;
  final sourceLanguageCode = 'zh-CN'.obs;
  final targetLanguageCode = 'en-US'.obs;
  final translatedText = ''.obs;
  final isTranslating = false.obs;
  final inputText = ''.obs;

  // 支持的语言列表
  List<String> get supportedLanguages => _languageManager.getAllChineseNames();

  @override
  void onInit() {
    super.onInit();

    // 初始化翻译服务
    _initializeTranslationService();

    _loadSavedLanguages();

    // 监听文本输入变化
    textController.addListener(() {
      inputText.value = textController.text;
    });
  }

  /// 初始化翻译服务
  Future<void> _initializeTranslationService() async {
    try {
      // 已初始化则跳过
      if (_translationService.isInitialized) {
        Logger.info('翻译服务已初始化');
        return;
      }
      // final initialized =
      final initialized = await _translationService.initialize();
      if (!initialized) {
        Logger.error('翻译服务初始化失败');
        Get.snackbar(
          'error'.tr,
          '翻译服务初始化失败，请检查网络连接',
          snackPosition: SnackPosition.TOP,
          backgroundColor: Colors.red.withOpacity(0.9),
          colorText: Colors.white,
        );
      } else {
        Logger.info('翻译服务初始化成功');
      }
    } catch (e) {
      Logger.error('翻译服务初始化异常: $e');
    }
  }

  @override
  void onClose() {
    textController.dispose();
    super.onClose();
  }

  /// 加载保存的语言设置
  void _loadSavedLanguages() {
    try {
      final savedSourceLanguage =
          _storage.read('text_translation_source_language');
      final savedTargetLanguage =
          _storage.read('text_translation_target_language');

      if (savedSourceLanguage != null &&
          supportedLanguages.contains(savedSourceLanguage)) {
        sourceLanguageChineseName.value = savedSourceLanguage;
        // 同时更新语言代码
        final asrCode =
            _languageManager.getAsrCodeByChineseName(savedSourceLanguage);
        if (asrCode != null) {
          sourceLanguageCode.value = asrCode;
        }
      }

      if (savedTargetLanguage != null &&
          supportedLanguages.contains(savedTargetLanguage)) {
        targetLanguageChineseName.value = savedTargetLanguage;
        // 同时更新语言代码
        final asrCode =
            _languageManager.getAsrCodeByChineseName(savedTargetLanguage);
        if (asrCode != null) {
          targetLanguageCode.value = asrCode;
        }
      }
    } catch (e) {
      Logger.error('加载语言设置失败: $e');
    }
  }

  /// 保存语言设置
  void _saveLanguageSettings() {
    try {
      _storage.write(
          'text_translation_source_language', sourceLanguageChineseName.value);
      _storage.write(
          'text_translation_target_language', targetLanguageChineseName.value);
    } catch (e) {
      Logger.error('保存语言设置失败: $e');
    }
  }

  /// 设置源语言
  void setSourceLanguage(String language) {
    if (language != sourceLanguageChineseName.value) {
      sourceLanguageChineseName.value = language;

      // 同时更新语言代码；当选择“自动检测”时，将源语言代码置空，后续翻译流程会进行语种检测
      if (language == '自动检测') {
        sourceLanguageCode.value = '';
      } else {
        final asrCode = _languageManager.getAsrCodeByChineseName(language);
        if (asrCode != null) {
          sourceLanguageCode.value = asrCode;
        }
      }

      _saveLanguageSettings();

      // 如果已有翻译结果，清空结果
      if (translatedText.value.isNotEmpty) {
        translatedText.value = '';
      }
    }
  }

  /// 设置目标语言
  void setTargetLanguage(String language) {
    if (language != targetLanguageChineseName.value) {
      targetLanguageChineseName.value = language;

      // 同时更新语言代码
      final asrCode = _languageManager.getAsrCodeByChineseName(language);
      if (asrCode != null) {
        targetLanguageCode.value = asrCode;
      }

      _saveLanguageSettings();

      // 如果已有翻译结果，清空结果
      if (translatedText.value.isNotEmpty) {
        translatedText.value = '';
      }
    }
  }

  /// 交换源语言和目标语言
  void swapLanguages() {
    final tempSource = sourceLanguageChineseName.value;
    final tempTarget = targetLanguageChineseName.value;
    final tempSourceCode = sourceLanguageCode.value;
    final tempTargetCode = targetLanguageCode.value;
    final tempInputText = textController.text;
    final tempTranslatedText = translatedText.value;

    sourceLanguageChineseName.value = tempTarget;
    targetLanguageChineseName.value = tempSource;
    sourceLanguageCode.value = tempTargetCode;
    targetLanguageCode.value = tempSourceCode;

    // 交换输入文本和翻译结果
    textController.text = tempTranslatedText;
    translatedText.value = tempInputText;

    _saveLanguageSettings();
  }

  /// 执行翻译
  Future<void> translateText() async {
    final text = textController.text.trim();

    // 验证输入
    if (text.isEmpty) {
      // Get.snackbar(
      //   'error'.tr,
      //   'pleaseInputText'.tr,
      //   snackPosition: SnackPosition.TOP,
      //   backgroundColor: Colors.orange.withOpacity(0.9),
      //   colorText: Colors.white,
      // );
      return;
    }

    if (text.length > 5000) {
      // 5000 字符限制
      Get.snackbar(
        'error'.tr,
        'textTooLong'.tr,
        snackPosition: SnackPosition.TOP,
        backgroundColor: Colors.orange.withOpacity(0.9),
        colorText: Colors.white,
      );
      return;
    }

    // 检查源语言和目标语言是否相同
    if (sourceLanguageChineseName.value == targetLanguageChineseName.value) {
      translatedText.value = text;
      return;
    }

    isTranslating.value = true;
    translatedText.value = '';

    try {
      Logger.info('开始翻译: $text');
      Logger.info(
          '源语言: ${sourceLanguageChineseName.value} -> ${sourceLanguageCode.value}');
      Logger.info(
          '目标语言: ${targetLanguageChineseName.value} -> ${targetLanguageCode.value}');

      // 确保翻译服务已初始化
      Logger.info('确保翻译服务已初始化...');
      bool initialized = _translationService.isInitialized;
      if (!initialized) {
        initialized = await _translationService.initialize();
      }
      Logger.info('翻译服务初始化结果: $initialized');
      if (!initialized) {
        throw Exception('翻译服务初始化失败');
      }

      Logger.info('调用翻译服务...');

      // 若选择了“自动检测”，先进行语种检测
      if (sourceLanguageChineseName.value == '自动检测' ||
          sourceLanguageCode.value.isEmpty) {
        Logger.info('源语言为自动检测，开始语种检测…');
        final detectedAsrCode =
            await _translationService.detectTextLanguage(text: text);
        if (detectedAsrCode == null || detectedAsrCode.isEmpty) {
          Logger.error('语种检测失败');
          Get.snackbar(
            '错误', // 翻译键代表的中文文本内容
            '语种检测失败，请手动选择源语言或稍后重试', // 翻译键代表的中文文本内容
            snackPosition: SnackPosition.TOP,
            backgroundColor: Colors.red.withOpacity(0.9),
            colorText: Colors.white,
          );
          return;
        }
        sourceLanguageCode.value = detectedAsrCode;
        Logger.info('语种检测结果: $detectedAsrCode');
      }

      // 调用翻译服务，使用检测或手动选择的源语言代码
      final result = await _translationService.translateText(
        text: text,
        sourceLanguageCode: sourceLanguageCode.value,
        targetLanguageCode: targetLanguageCode.value,
      );

      Logger.info('翻译服务返回结果: $result');

      if (result != null && result.isNotEmpty) {
        translatedText.value = result;
        Logger.info('翻译成功: $result');
      } else {
        Logger.error('翻译服务返回空结果');
        throw Exception('翻译服务返回空结果');
      }
    } catch (e) {
      Logger.error('翻译失败: $e');
      Get.snackbar(
        'error'.tr,
        'translationFailed'.tr,
        snackPosition: SnackPosition.TOP,
        backgroundColor: Colors.red.withOpacity(0.9),
        colorText: Colors.white,
      );
    } finally {
      isTranslating.value = false;
    }
  }

  /// 复制翻译结果
  void copyResult() {
    if (translatedText.value.isNotEmpty) {
      Clipboard.setData(ClipboardData(text: translatedText.value));
      Get.snackbar(
        'success'.tr,
        'copied'.tr,
        snackPosition: SnackPosition.TOP,
        backgroundColor: Colors.green.withOpacity(0.9),
        colorText: Colors.white,
        duration: const Duration(seconds: 2),
      );
    }
  }

  /// 清空输入
  void clearInput() {
    textController.clear();
    translatedText.value = '';
  }

  /// 显示语言选择对话框
  void showLanguageSelector({required bool isSourceLanguage}) {
    Get.bottomSheet(
      Container(
        height: Get.height * 0.6,
        decoration: const BoxDecoration(
          color: Colors.white,
          borderRadius: BorderRadius.vertical(top: Radius.circular(20)),
        ),
        child: Column(
          children: [
            Container(
              padding: const EdgeInsets.all(16),
              child: Row(
                mainAxisAlignment: MainAxisAlignment.spaceBetween,
                children: [
                  Text(
                    isSourceLanguage
                        ? 'sourceLanguage'.tr
                        : 'targetLanguage'.tr,
                    style: const TextStyle(
                      fontSize: 18,
                      fontWeight: FontWeight.bold,
                    ),
                  ),
                  IconButton(
                    onPressed: () => Get.back(),
                    icon: const Icon(Icons.close),
                  ),
                ],
              ),
            ),
            const Divider(height: 1),
            Expanded(
              child: ListView.builder(
                itemCount: (isSourceLanguage
                        ? (supportedLanguages.length + 1)
                        : supportedLanguages.length),
                itemBuilder: (context, index) {
                  final language = isSourceLanguage
                      ? (index == 0
                          ? '自动检测'
                          : supportedLanguages[index - 1])
                      : supportedLanguages[index];
                  final isSelected = isSourceLanguage
                      ? language == sourceLanguageChineseName.value
                      : language == targetLanguageChineseName.value;

                  return ListTile(
                    title: Text(language),
                    trailing: isSelected
                        ? const Icon(Icons.check, color: Colors.blue)
                        : null,
                    onTap: () {
                      if (isSourceLanguage) {
                        setSourceLanguage(language);
                      } else {
                        setTargetLanguage(language);
                      }
                      Get.back();
                    },
                  );
                },
              ),
            ),
          ],
        ),
      ),
      isScrollControlled: true,
    );
  }
}