import 'dart:convert';
import 'package:get/get.dart';
import 'package:get_storage/get_storage.dart';
import '../models/translation_usage_stats.dart';
import '../../core/utils/logger.dart';

/// 使用量统计服务
class UsageStatsService extends GetxService {
  static const String _storageKey = 'usage_stats';
  static const String _dailyStatsKey = 'daily_translation_stats';

  final GetStorage _storage = GetStorage();

  // 实时统计数据
  final Rx<RealtimeUsageStats> realtimeStats = RealtimeUsageStats().obs;

  // 当日统计数据
  final Rx<TranslationUsageStats> todayStats =
      TranslationUsageStats.empty('').obs;

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

  /// 初始化服务
  void _initializeService() {
    _loadTodayStats();
    Logger.info('lxm--使用量统计服务初始化完成');
  }

  /// 加载当日统计数据
  void _loadTodayStats() {
    try {
      final today = DateTime.now();
      final todayKey =
          '${today.year}-${today.month.toString().padLeft(2, '0')}-${today.day.toString().padLeft(2, '0')}';

      final statsData = _storage.read('${_dailyStatsKey}_$todayKey');
      if (statsData != null) {
        todayStats.value = TranslationUsageStats.fromJson(
            Map<String, dynamic>.from(statsData));
      } else {
        todayStats.value = TranslationUsageStats.empty(getCurrentUserId());
      }
    } catch (e) {
      Logger.error('加载当日统计数据失败: $e');
      todayStats.value = TranslationUsageStats.empty(getCurrentUserId());
    }
  }

  /// 获取当前用户ID
  String getCurrentUserId() {
    try {
      final userInfo = _storage.read('user_info');
      if (userInfo != null && userInfo['user'] != null) {
        return userInfo['user']['uid'] ?? 'anonymous';
      }
    } catch (e) {
      Logger.warning('获取用户ID失败: $e');
    }
    return 'anonymous';
  }

  /// 记录翻译API调用
  void recordTranslationApiCall({
    required String sourceText,
    required String targetText,
    required String sourceLanguage,
    required String targetLanguage,
    required String mode,
  }) {
    try {
      // 更新实时统计
      realtimeStats.value.translationCount++;
      realtimeStats.value.sourceTextCharacters += sourceText.length;
      realtimeStats.value.ttsTextCharacters += targetText.length;
      realtimeStats.value.currentLanguagePair =
          '$sourceLanguage-$targetLanguage';
      realtimeStats.value.currentMode = mode;
      realtimeStats.refresh();

      // 更新当日统计 - 使用多维度统计
      final languagePair = '$sourceLanguage→$targetLanguage';

      // 更新语言对统计
      final newLanguagePairStats = Map<String, LanguagePairStats>.from(
          todayStats.value.languagePairStats);
      if (newLanguagePairStats.containsKey(languagePair)) {
        final existing = newLanguagePairStats[languagePair]!;
        newLanguagePairStats[languagePair] = LanguagePairStats(
          languagePair: languagePair,
          translationCount: existing.translationCount + 1,
          sourceCharacters: existing.sourceCharacters + sourceText.length,
        );
      } else {
        newLanguagePairStats[languagePair] = LanguagePairStats(
          languagePair: languagePair,
          translationCount: 1,
          sourceCharacters: sourceText.length,
        );
      }

      // 更新模式统计
      final newModeStats =
          Map<String, TranslationModeStats>.from(todayStats.value.modeStats);
      if (newModeStats.containsKey(mode)) {
        final existing = newModeStats[mode]!;
        newModeStats[mode] = existing.copyWith(
          apiCalls: existing.apiCalls + 1,
          sourceCharacters: existing.sourceCharacters + sourceText.length,
          ttsCharacters: existing.ttsCharacters + targetText.length,
        );
      } else {
        newModeStats[mode] = TranslationModeStats(
          apiCalls: 1,
          sourceCharacters: sourceText.length,
          ttsCharacters: targetText.length,
        );
      }

      todayStats.value = todayStats.value.copyWith(
        translationApiCalls: todayStats.value.translationApiCalls + 1,
        sourceTextCharacters:
            todayStats.value.sourceTextCharacters + sourceText.length,
        ttsTextCharacters:
            todayStats.value.ttsTextCharacters + targetText.length,
        languagePairStats: newLanguagePairStats,
        modeStats: newModeStats,
      );

      _saveTodayStats();

      Logger.info(
          '记录翻译API调用: 源文本${sourceText.length}字符, 目标文本${targetText.length}字符');
    } catch (e) {
      Logger.error('记录翻译API调用失败: $e');
    }
  }

  /// 记录ASR API调用 - 优化版（精确统计参数）
  void recordAsrApiCall({
    required int effectiveDurationSeconds, // 有效语音时长（VAD检测的实际语音）
    required int totalDurationSeconds, // 总会话时长（包含静音）
    required String language,
    required String mode, // 翻译模式
    String? audioFormat, // 音频格式（可选）
    int? sampleRate, // 采样率（可选）
  }) {
    try {
      // 更新实时统计（使用有效语音时长作为主要计费依据）
      realtimeStats.value.effectiveAudioDuration += effectiveDurationSeconds;
      realtimeStats.value.totalSessionDuration += totalDurationSeconds;
      realtimeStats.refresh();

      // 更新模式统计
      final newModeStats =
          Map<String, TranslationModeStats>.from(todayStats.value.modeStats);
      if (newModeStats.containsKey(mode)) {
        final existing = newModeStats[mode]!;
        newModeStats[mode] = existing.copyWith(
          effectiveAudioDuration:
              existing.effectiveAudioDuration + effectiveDurationSeconds,
        );
      } else {
        newModeStats[mode] = TranslationModeStats(
          effectiveAudioDuration: effectiveDurationSeconds,
        );
      }

      // 更新当日统计
      todayStats.value = todayStats.value.copyWith(
        asrApiCalls: todayStats.value.asrApiCalls + 1,
        effectiveAudioDuration:
            todayStats.value.effectiveAudioDuration + effectiveDurationSeconds,
        totalSessionDuration:
            todayStats.value.totalSessionDuration + totalDurationSeconds,
        modeStats: newModeStats,
      );

      _saveTodayStats();

      Logger.info(
          'ASR统计: 有效语音${effectiveDurationSeconds}秒, 总时长${totalDurationSeconds}秒, 语言$language, 模式$mode');
    } catch (e) {
      Logger.error('记录ASR API调用失败: $e');
    }
  }

  /// 记录TTS API调用
  void recordTtsApiCall({
    required String text,
    required int durationSeconds,
    required String language,
  }) {
    try {
      // 更新实时统计
      realtimeStats.value.totalSessionDuration += durationSeconds;
      realtimeStats.refresh();

      // 更新当日统计（TTS按字符数计费，不是按时长）
      todayStats.value = todayStats.value.copyWith(
        ttsApiCalls: todayStats.value.ttsApiCalls + 1,
        ttsTextCharacters: todayStats.value.ttsTextCharacters + text.length,
        totalSessionDuration:
            todayStats.value.totalSessionDuration + durationSeconds,
      );

      _saveTodayStats();

      Logger.info('记录TTS API调用: 文本${text.length}字符, 时长${durationSeconds}秒');
    } catch (e) {
      Logger.error('记录TTS API调用失败: $e');
    }
  }

  /// 记录AI摘要API调用
  void recordAiSummaryApiCall() {
    try {
      // 更新当日统计
      todayStats.value = todayStats.value.copyWith(
        aiSummaryApiCalls: todayStats.value.aiSummaryApiCalls + 1,
      );

      _saveTodayStats();

      Logger.info('记录AI摘要API调用');
    } catch (e) {
      Logger.error('记录AI摘要API调用失败: $e');
    }
  }

  /// 开始新会话
  void startNewSession() {
    realtimeStats.value.reset();

    // 更新当日会话数
    todayStats.value = todayStats.value.copyWith(
      sessionCount: todayStats.value.sessionCount + 1,
    );

    _saveTodayStats();
    Logger.info('开始新的翻译会话');
  }

  /// 保存当日统计数据
  void _saveTodayStats() {
    try {
      final today = DateTime.now();
      final todayKey =
          '${today.year}-${today.month.toString().padLeft(2, '0')}-${today.day.toString().padLeft(2, '0')}';
      _storage.write('${_dailyStatsKey}_$todayKey', todayStats.value.toJson());
    } catch (e) {
      Logger.error('保存当日统计数据失败: $e');
    }
  }

  /// 获取历史统计数据
  Future<List<TranslationUsageStats>> getHistoryStats({
    required DateTime startDate,
    required DateTime endDate,
  }) async {
    try {
      final List<TranslationUsageStats> historyStats = [];

      for (DateTime date = startDate;
          date.isBefore(endDate) || date.isAtSameMomentAs(endDate);
          date = date.add(const Duration(days: 1))) {
        final dateKey =
            '${date.year}-${date.month.toString().padLeft(2, '0')}-${date.day.toString().padLeft(2, '0')}';
        final statsData = _storage.read('${_dailyStatsKey}_$dateKey');

        if (statsData != null) {
          historyStats.add(TranslationUsageStats.fromJson(
              Map<String, dynamic>.from(statsData)));
        }
      }

      return historyStats;
    } catch (e) {
      Logger.error('获取历史统计数据失败: $e');
      return [];
    }
  }

  /// 清理过期数据（保留最近90天）
  void cleanupOldData() {
    try {
      final cutoffDate = DateTime.now().subtract(const Duration(days: 90));
      final allKeys = _storage.getKeys();

      for (final key in allKeys) {
        if (key.startsWith(_dailyStatsKey)) {
          final dateStr = key.replaceFirst('${_dailyStatsKey}_', '');
          try {
            final date = DateTime.parse(dateStr);
            if (date.isBefore(cutoffDate)) {
              _storage.remove(key);
              Logger.info('清理过期统计数据: $key');
            }
          } catch (e) {
            // 忽略解析错误的键
          }
        }
      }
    } catch (e) {
      Logger.error('清理过期数据失败: $e');
    }
  }

  /// 获取月度统计汇总
  Future<TranslationUsageStats> getMonthlyStats(int year, int month) async {
    try {
      final startDate = DateTime(year, month, 1);
      final endDate = DateTime(year, month + 1, 0); // 月末

      final dailyStats = await getHistoryStats(
        startDate: startDate,
        endDate: endDate,
      );

      if (dailyStats.isEmpty) {
        return TranslationUsageStats.empty(getCurrentUserId());
      }

      // 汇总月度数据
      int totalTranslationCalls = 0;
      int totalAsrCalls = 0;
      int totalTtsCalls = 0;
      int totalAiSummaryCalls = 0;
      int totalSourceChars = 0;
      int totalTargetChars = 0;
      int totalRecordingDuration = 0;
      int totalTtsPlayDuration = 0;
      int totalSessions = 0;
      //double totalCost = 0.0;

      final Map<String, int> combinedLanguagePairUsage = {};
      final Map<String, int> combinedModeUsage = {};

      for (final stats in dailyStats) {
        totalTranslationCalls += stats.translationApiCalls;
        totalAsrCalls += stats.asrApiCalls;
        totalTtsCalls += stats.ttsApiCalls;
        totalAiSummaryCalls += stats.aiSummaryApiCalls;
        totalSourceChars += stats.sourceCharacterCount;
        totalTargetChars += stats.targetCharacterCount;
        totalRecordingDuration += stats.audioRecordingDuration;
        totalTtsPlayDuration += stats.ttsPlaybackDuration;
        totalSessions += stats.sessionCount;
        // totalCost += stats.estimatedCost;

        // 合并语言对使用统计
        stats.languagePairUsage.forEach((key, value) {
          combinedLanguagePairUsage[key] =
              (combinedLanguagePairUsage[key] ?? 0) + value;
        });

        // 合并模式使用统计
        stats.modeUsage.forEach((key, value) {
          combinedModeUsage[key] = (combinedModeUsage[key] ?? 0) + value;
        });
      }

      return TranslationUsageStats(
        id: 'monthly_${year}_$month',
        date: startDate,
        userId: getCurrentUserId(),
        timeGranularity: 'month',
        translationApiCalls: totalTranslationCalls,
        asrApiCalls: totalAsrCalls,
        ttsApiCalls: totalTtsCalls,
        aiSummaryApiCalls: totalAiSummaryCalls,
        sourceTextCharacters: totalSourceChars,
        effectiveAudioDuration: totalRecordingDuration,
        ttsTextCharacters: totalTargetChars,
        totalSessionDuration: totalTtsPlayDuration,
        sessionCount: totalSessions,
        // estimatedCost: totalCost,
      );
    } catch (e) {
      Logger.error('获取月度统计失败: $e');
      return TranslationUsageStats.empty(getCurrentUserId());
    }
  }
}