import 'package:flutter/material.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';

import 'video_batch_upload_queue.dart';
import 'video_batch_upload_task.dart';

class VideoBatchUploadPanel extends StatelessWidget {
  const VideoBatchUploadPanel({
    super.key,
    required this.queue,
  });

  final VideoBatchUploadQueue queue;

  @override
  Widget build(BuildContext context) {
    if (!queue.hasTasks) {
      return const SizedBox.shrink();
    }
    return Positioned(
      left: 0,
      right: 0,
      bottom: 0,
      child: AnimatedSwitcher(
        duration: const Duration(milliseconds: 180),
        child: queue.isExpanded
            ? _ExpandedUploadPanel(queue: queue)
            : _CollapsedUploadBar(queue: queue),
      ),
    );
  }
}

class _CollapsedUploadBar extends StatelessWidget {
  const _CollapsedUploadBar({required this.queue});

  final VideoBatchUploadQueue queue;

  @override
  Widget build(BuildContext context) {
    return SafeArea(
      top: false,
      child: GestureDetector(
        onTap: queue.toggleExpanded,
        child: Container(
          height: 70.h,
          margin: EdgeInsets.fromLTRB(24.w, 0, 24.w, 18.h),
          padding: EdgeInsets.symmetric(horizontal: 22.w),
          decoration: BoxDecoration(
            color: Colors.white,
            borderRadius: BorderRadius.circular(18.r),
            boxShadow: <BoxShadow>[
              BoxShadow(
                color: Colors.black.withValues(alpha: 0.12),
                blurRadius: 18.r,
                offset: Offset(0, 6.h),
              ),
            ],
          ),
          child: Row(
            children: <Widget>[
              Icon(
                Icons.cloud_upload_outlined,
                color: const Color(0xFF46A5FF),
                size: 34.sp,
              ),
              SizedBox(width: 12.w),
              Expanded(
                child: Text(
                  '正在上传${queue.assetType.label} ${queue.finishedCount}/${queue.totalCount}',
                  style: TextStyle(
                    fontSize: 24.sp,
                    color: const Color(0xFF1F2937),
                    fontWeight: FontWeight.w500,
                  ),
                ),
              ),
              Icon(
                Icons.keyboard_arrow_up_rounded,
                color: const Color(0xFF667085),
                size: 34.sp,
              ),
            ],
          ),
        ),
      ),
    );
  }
}

class _ExpandedUploadPanel extends StatelessWidget {
  const _ExpandedUploadPanel({required this.queue});

  final VideoBatchUploadQueue queue;

  @override
  Widget build(BuildContext context) {
    final double bottomPadding = MediaQuery.of(context).padding.bottom;
    return Container(
      constraints: BoxConstraints(maxHeight: 560.h),
      padding: EdgeInsets.fromLTRB(24.w, 20.h, 24.w, 18.h + bottomPadding),
      decoration: BoxDecoration(
        color: Colors.white,
        borderRadius: BorderRadius.vertical(top: Radius.circular(24.r)),
        boxShadow: <BoxShadow>[
          BoxShadow(
            color: Colors.black.withValues(alpha: 0.12),
            blurRadius: 18.r,
            offset: Offset(0, -6.h),
          ),
        ],
      ),
      child: Column(
        mainAxisSize: MainAxisSize.min,
        children: <Widget>[
          Row(
            children: <Widget>[
              Expanded(
                child: Text(
                  '上传${queue.assetType.label}',
                  style: TextStyle(
                    fontSize: 30.sp,
                    color: const Color(0xFF111827),
                    fontWeight: FontWeight.w600,
                  ),
                ),
              ),
              Text(
                '${queue.finishedCount}/${queue.totalCount}',
                style: TextStyle(
                  fontSize: 24.sp,
                  color: const Color(0xFF667085),
                ),
              ),
              SizedBox(width: 10.w),
              GestureDetector(
                onTap: queue.toggleExpanded,
                behavior: HitTestBehavior.opaque,
                child: Icon(
                  Icons.keyboard_arrow_down_rounded,
                  color: const Color(0xFF667085),
                  size: 38.sp,
                ),
              ),
            ],
          ),
          SizedBox(height: 16.h),
          Flexible(
            child: ListView.separated(
              padding: EdgeInsets.zero,
              shrinkWrap: true,
              itemCount: queue.tasks.length,
              separatorBuilder: (_, __) => SizedBox(height: 12.h),
              itemBuilder: (_, int index) {
                final VideoBatchUploadTask task = queue.tasks[index];
                return _UploadTaskCell(
                  task: task,
                  onRetry: () => queue.retryTask(task),
                  onRemove: () => queue.removeTask(task),
                );
              },
            ),
          ),
        ],
      ),
    );
  }
}

class _UploadTaskCell extends StatelessWidget {
  const _UploadTaskCell({
    required this.task,
    required this.onRetry,
    required this.onRemove,
  });

  final VideoBatchUploadTask task;
  final VoidCallback onRetry;
  final VoidCallback onRemove;

  @override
  Widget build(BuildContext context) {
    final Color statusColor = task.status == VideoBatchUploadStatus.failed
        ? const Color(0xFFE5484D)
        : const Color(0xFF667085);
    return Container(
      padding: EdgeInsets.all(12.w),
      decoration: BoxDecoration(
        color: const Color(0xFFF7F8FA),
        borderRadius: BorderRadius.circular(16.r),
      ),
      child: Row(
        children: <Widget>[
          ClipRRect(
            borderRadius: BorderRadius.circular(12.r),
            child: SizedBox(
              width: 86.w,
              height: 86.w,
              child: task.thumbnail == null
                  ? Container(
                      color: const Color(0xFFEDEFF3),
                      alignment: Alignment.center,
                      child: Icon(
                        task.assetType == VideoBatchUploadAssetType.video
                            ? Icons.videocam_outlined
                            : Icons.image_outlined,
                        size: 46.sp,
                        color: const Color(0xFF98A2B3),
                      ),
                    )
                  : Image.memory(
                      task.thumbnail!,
                      fit: BoxFit.cover,
                    ),
            ),
          ),
          SizedBox(width: 14.w),
          Expanded(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: <Widget>[
                Text(
                  task.fileName,
                  maxLines: 1,
                  overflow: TextOverflow.ellipsis,
                  style: TextStyle(
                    fontSize: 24.sp,
                    color: const Color(0xFF1F2937),
                    fontWeight: FontWeight.w500,
                  ),
                ),
                SizedBox(height: 8.h),
                Text(
                  _subtitle,
                  maxLines: 1,
                  overflow: TextOverflow.ellipsis,
                  style: TextStyle(
                    fontSize: 20.sp,
                    color: const Color(0xFF8D90A0),
                  ),
                ),
                SizedBox(height: 10.h),
                ClipRRect(
                  borderRadius: BorderRadius.circular(999),
                  child: LinearProgressIndicator(
                    value: task.progress.clamp(0, 1),
                    minHeight: 6.h,
                    backgroundColor: const Color(0xFFE5E7EB),
                    valueColor: AlwaysStoppedAnimation<Color>(
                      task.status == VideoBatchUploadStatus.failed
                          ? const Color(0xFFE5484D)
                          : const Color(0xFF46A5FF),
                    ),
                  ),
                ),
              ],
            ),
          ),
          SizedBox(width: 12.w),
          SizedBox(
            width: 96.w,
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.end,
              children: <Widget>[
                Text(
                  task.status == VideoBatchUploadStatus.failed &&
                          task.errorMessage.isNotEmpty
                      ? task.errorMessage
                      : task.status.label,
                  maxLines: 1,
                  overflow: TextOverflow.ellipsis,
                  textAlign: TextAlign.right,
                  style: TextStyle(
                    fontSize: 20.sp,
                    color: statusColor,
                  ),
                ),
                SizedBox(height: 12.h),
                _TaskActionButton(
                  task: task,
                  onRetry: onRetry,
                  onRemove: onRemove,
                ),
              ],
            ),
          ),
        ],
      ),
    );
  }

  String get _subtitle {
    final List<String> parts = <String>[
      if (task.durationText.isNotEmpty) task.durationText,
      if (task.fileSizeText.isNotEmpty) task.fileSizeText,
    ];
    return parts.isEmpty ? task.assetType.localLabel : parts.join(' · ');
  }
}

class _TaskActionButton extends StatelessWidget {
  const _TaskActionButton({
    required this.task,
    required this.onRetry,
    required this.onRemove,
  });

  final VideoBatchUploadTask task;
  final VoidCallback onRetry;
  final VoidCallback onRemove;

  @override
  Widget build(BuildContext context) {
    if (task.canRetry) {
      return GestureDetector(
        onTap: onRetry,
        behavior: HitTestBehavior.opaque,
        child: Text(
          '重试',
          style: TextStyle(
            fontSize: 22.sp,
            color: const Color(0xFF46A5FF),
            fontWeight: FontWeight.w500,
          ),
        ),
      );
    }
    if (task.status == VideoBatchUploadStatus.completed) {
      return Icon(
        Icons.check_circle_rounded,
        size: 30.sp,
        color: const Color(0xFF12B76A),
      );
    }
    return GestureDetector(
      onTap: onRemove,
      behavior: HitTestBehavior.opaque,
      child: Icon(
        task.status == VideoBatchUploadStatus.uploading
            ? Icons.close_rounded
            : Icons.delete_outline_rounded,
        size: 30.sp,
        color: const Color(0xFF98A2B3),
      ),
    );
  }
}