import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import '../controllers/translation_controller.dart';
import '../controllers/translation_history_controller.dart';
import '../bindings/translation_detail_binding.dart';
import 'translation_detail_view.dart';
import '../../../core/theme/app_colors.dart';

class TranslationHistoryView extends GetView<TranslationHistoryController> {
  const TranslationHistoryView({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    final isDarkMode = Theme.of(context).brightness == Brightness.dark;
    
    return Scaffold(
      backgroundColor: isDarkMode ? AppColors.darkBackground : Color(0xFFF5F5F8),
      appBar: _buildAppBar(isDarkMode),
      body: Obx(() {
        if (!controller.hasHistory) {
          return Center(
            child: Text(
              '暂无历史记录',
              style: TextStyle(
                fontSize: 16.sp,
                color: isDarkMode ? Colors.grey[400] : Colors.grey,
              ),
            ),
          );
        }

        if (controller.isLoading.value) {
          return Center(
            child: CircularProgressIndicator(
              color: isDarkMode ? AppColors.primary : Colors.blue,
            ),
          );
        }

        return ListView.builder(
          padding: EdgeInsets.symmetric(horizontal: 16.w, vertical: 8.h),
          itemCount: controller.sortedDates.length,
          itemBuilder: (context, index) {
            final date = controller.sortedDates[index];
            final items = controller.groupedHistory.value[date]!;
            
            return Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Padding(
                  padding: EdgeInsets.only(top: 24.h, bottom: 12.h, left: 12.w),
                  child: Text(
                    date,
                    style: TextStyle(
                      fontSize: 14.sp,
                      fontWeight: FontWeight.w600,
                      color: isDarkMode ? Colors.grey[400] : Colors.grey[600],
                      letterSpacing: 1.0,
                    ),
                  ),
                ),
                _buildDateGroupContainer(items, isDarkMode),
              ],
            );
          },
        );
      }),
    );
  }
  
  // 构建日期组容器
  Widget _buildDateGroupContainer(List<TranslationItem> items, bool isDarkMode) {
    return Container(
      margin: EdgeInsets.only(bottom: 16.h),
      decoration: BoxDecoration(
        color: isDarkMode ? AppColors.cardBackground : Colors.white,
        borderRadius: BorderRadius.circular(16.r),
        boxShadow: [
          BoxShadow(
            color: Colors.black.withAlpha(isDarkMode ? 30 : 8),
            blurRadius: 8,
            offset: Offset(0, 2),
          ),
        ],
      ),
      child: ListView.separated(
        physics: NeverScrollableScrollPhysics(),
        shrinkWrap: true,
        padding: EdgeInsets.zero,
        itemCount: items.length,
        separatorBuilder: (context, index) => Divider(
          height: 1,
          thickness: 0.5,
          color: isDarkMode ? Colors.grey[800] : Colors.grey[200],
          indent: 0,
          endIndent: 0,
        ),
        itemBuilder: (context, index) {
          return _buildHistoryItemInGroup(items[index], isDarkMode);
        },
      ),
    );
  }
  
  // 构建组内的历史记录项
  Widget _buildHistoryItemInGroup(TranslationItem item, bool isDarkMode) {
    return InkWell(
      onTap: () {
        // 点击查看详情
        _showTranslationDetail(item);
      },
      splashColor: Colors.blue.withOpacity(0.1),
      highlightColor: Colors.blue.withOpacity(0.05),
      borderRadius: BorderRadius.circular(8.r),
      child: Padding(
        padding: EdgeInsets.symmetric(horizontal: 20.w, vertical: 16.h),
        child: Row(
          crossAxisAlignment: CrossAxisAlignment.center,
          children: [
            Expanded(
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  // 源文本
                  Text(
                    item.sourceText,
                    style: TextStyle(
                      fontSize: 15.sp,
                      fontWeight: FontWeight.w500,
                      color: isDarkMode ? Colors.white : Colors.black,
                    ),
                    maxLines: 2,
                    overflow: TextOverflow.ellipsis,
                  ),
                  SizedBox(height: 6.h),
                  // 翻译文本
                  Text(
                    item.translatedText,
                    style: TextStyle(
                      fontSize: 14.sp,
                      color: isDarkMode ? Colors.grey[400] : Colors.grey[700],
                    ),
                    maxLines: 2,
                    overflow: TextOverflow.ellipsis,
                  ),
                ],
              ),
            ),
            Icon(
              Icons.chevron_right,
              color: isDarkMode ? Colors.grey[600] : Colors.grey[350],
              size: 20.sp,
            ),
          ],
        ),
      ),
    );
  }
  
  void _showTranslationDetail(TranslationItem item) {
    // 获取该会话的所有翻译项
    final List<TranslationItem> sessionItems = controller.getSessionItems(item.sessionId);
    
    Get.to(
      () => TranslationDetailView(),
      arguments: {
        'item': item,
        'sessionItems': sessionItems,
        'historyController': controller,
      },
      binding: TranslationDetailBinding(),
    );
  }

  void _showClearHistoryConfirmDialog() {
    final isDarkMode = Get.isDarkMode;
    
    Get.dialog(
      AlertDialog(
        backgroundColor: isDarkMode ? AppColors.cardBackground : Colors.white,
        title: Text(
          '清除历史记录',
          style: TextStyle(
            fontSize: 18.sp,
            fontWeight: FontWeight.bold,
            color: isDarkMode ? Colors.white : Colors.black,
          ),
        ),
        content: Text(
          '确定要清除所有翻译历史记录吗？此操作无法撤销。',
          style: TextStyle(
            fontSize: 16.sp,
            color: isDarkMode ? Colors.grey[300] : Colors.black87,
          ),
        ),
        actions: [
          TextButton(
            onPressed: () => Get.back(),
            child: Text(
              '取消',
              style: TextStyle(
                fontSize: 16.sp,
                color: isDarkMode ? Colors.grey[400] : Colors.grey[700],
              ),
            ),
          ),
          TextButton(
            onPressed: () {
              // 清除历史记录
              controller.translationController.clearTranslationHistory();
              Get.back();
            },
            child: Text(
              '确定',
              style: TextStyle(
                fontSize: 16.sp,
                color: Colors.red,
                fontWeight: FontWeight.bold,
              ),
            ),
          ),
        ],
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.circular(12.r),
        ),
      ),
    );
  }
  
  // 构建应用栏
  PreferredSizeWidget _buildAppBar(bool isDarkMode) {
    return AppBar(
      backgroundColor: isDarkMode ? AppColors.cardBackground : Color(0xFFF5F5F8),
      elevation: 0,
      leading: IconButton(
        icon: Icon(
          Icons.arrow_back_ios,
          color: isDarkMode ? Colors.white : Colors.black,
          size: 20.sp,
        ),
        onPressed: () => Get.back(),
      ),
      title: Text(
        'History',
        style: TextStyle(
          color: isDarkMode ? Colors.white : Colors.black,
          fontSize: 24.sp,
          fontWeight: FontWeight.bold,
        ),
      ),
      centerTitle: true,
      actions: [
        IconButton(
          icon: Icon(
            Icons.delete_outline,
            color: isDarkMode ? Colors.white : Colors.black,
            size: 24.sp,
          ),
          onPressed: () {
            _showClearHistoryConfirmDialog();
          },
        ),
      ],
    );
  }
}