import 'dart:io' show Platform;

import 'package:flutter/material.dart';

import '../utils/format_utils.dart';
import 'adaptive_modal.dart';
import 'app_loading_ring.dart';
import 'app_snack_bar.dart';
import 'version_filter.dart';
import 'version_grouping.dart';
import 'version_source_card.dart';

const int kCompactInlineVersionLimit = 6;
const int kDesktopInlineVersionLimit = 8;

int inlineVersionLimit() {
  return Platform.isAndroid
      ? kCompactInlineVersionLimit
      : kDesktopInlineVersionLimit;
}

Future<void> showAllVersionsSheet({
  required BuildContext context,
  required List<VersionSourceGroup> groups,
  String title = '全部版本',
}) async {
  final isSingleVersionPicker = groups.length == 1;
  await showAdaptiveModal<void>(
    context: context,
    maxWidth: isSingleVersionPicker ? 520 : 720,
    maxHeight: isSingleVersionPicker ? 300 : 640,
    compactMaxHeightFactor: isSingleVersionPicker ? 0.55 : 0.92,
    compactHeightFactor: isSingleVersionPicker ? null : 0.82,
    builder: (modalContext) => AllVersionsSheet(groups: groups, title: title),
  );
}


class AllVersionsSheet extends StatelessWidget {
  final List<VersionSourceGroup> groups;
  final String title;

  const AllVersionsSheet({
    super.key,
    required this.groups,
    this.title = '全部版本',
  });

  @override
  Widget build(BuildContext context) {
    final groupsByBucket = <String, List<VersionSourceGroup>>{};
    for (final group in groups) {
      final bucket = versionBucketOf(group.representative.resolutionLabel);
      groupsByBucket.putIfAbsent(bucket, () => []).add(group);
    }

    final concreteSourceCount = groups.fold<int>(
      0,
      (count, group) => count + group.members.length,
    );

    return Material(
      color: const Color(0xFF171A20),
      child: Column(
        mainAxisSize: MainAxisSize.min,
        children: [
          Padding(
            padding: const EdgeInsets.fromLTRB(20, 8, 8, 10),
            child: Row(
              children: [
                const Icon(
                  Icons.video_library_outlined,
                  color: Colors.white70,
                  size: 20,
                ),
                const SizedBox(width: 10),
                Text(
                  title,
                  style: const TextStyle(
                    color: Colors.white,
                    fontSize: 17,
                    fontWeight: FontWeight.w700,
                  ),
                ),
                const SizedBox(width: 8),
                Text(
                  '$concreteSourceCount 个来源',
                  style: TextStyle(
                    color: Colors.white.withValues(alpha: 0.55),
                    fontSize: 12,
                  ),
                ),
                const Spacer(),
                IconButton(
                  onPressed: () => Navigator.of(context).pop(),
                  icon: const Icon(Icons.close, color: Colors.white60),
                  tooltip: '关闭',
                ),
              ],
            ),
          ),
          Divider(height: 1, color: Colors.white.withValues(alpha: 0.08)),
          Flexible(
            fit: FlexFit.loose,
            child: ListView(
              shrinkWrap: true,
              padding: const EdgeInsets.fromLTRB(16, 16, 16, 24),
              children: [
                for (final bucket in kVersionBucketOrder)
                  if (groupsByBucket[bucket] case final bucketGroups?) ...[
                    _BucketHeader(label: bucket, count: bucketGroups.length),
                    const SizedBox(height: 8),
                    for (
                      var index = 0;
                      index < bucketGroups.length;
                      index++
                    ) ...[
                      _VersionGroupRow(group: bucketGroups[index]),
                      if (index < bucketGroups.length - 1)
                        const SizedBox(height: 10),
                    ],
                    const SizedBox(height: 20),
                  ],
              ],
            ),
          ),
        ],
      ),
    );
  }
}

class _BucketHeader extends StatelessWidget {
  final String label;
  final int count;

  const _BucketHeader({required this.label, required this.count});

  @override
  Widget build(BuildContext context) {
    return Row(
      children: [
        Text(
          label,
          style: const TextStyle(
            color: Colors.white,
            fontSize: 15,
            fontWeight: FontWeight.w700,
          ),
        ),
        const SizedBox(width: 8),
        Text(
          '$count 个版本',
          style: TextStyle(
            color: Colors.white.withValues(alpha: 0.5),
            fontSize: 12,
          ),
        ),
      ],
    );
  }
}

class _VersionGroupRow extends StatelessWidget {
  final VersionSourceGroup group;

  const _VersionGroupRow({required this.group});

  @override
  Widget build(BuildContext context) {
    final representative = group.representative;
    final sizeBytes = representative.sizeBytes;
    final bitrate = representative.bitrate;
    final details = <String>[
      if (sizeBytes != null && sizeBytes > 0) formatFileSize(sizeBytes),
      if (bitrate != null && bitrate > 0)
        '${(bitrate / 1e6).toStringAsFixed(2)}Mbps',
    ];

    return Container(
      padding: const EdgeInsets.all(14),
      decoration: BoxDecoration(
        color: Colors.white.withValues(alpha: 0.06),
        borderRadius: BorderRadius.circular(14),
        border: Border.all(color: Colors.white.withValues(alpha: 0.08)),
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Row(
            children: [
              Expanded(
                child: Text(
                  representative.topLabel,
                  maxLines: 1,
                  overflow: TextOverflow.ellipsis,
                  style: const TextStyle(
                    color: Colors.white,
                    fontSize: 15,
                    fontWeight: FontWeight.w700,
                  ),
                ),
              ),
              if (details.isNotEmpty)
                Text(
                  details.join(' · '),
                  style: TextStyle(
                    color: Colors.white.withValues(alpha: 0.58),
                    fontSize: 12,
                  ),
                ),
            ],
          ),
          const SizedBox(height: 12),
          Wrap(
            spacing: 8,
            runSpacing: 8,
            children: [
              for (final member in group.members)
                _ServerSourceChip(data: member),
            ],
          ),
        ],
      ),
    );
  }
}

class _ServerSourceChip extends StatefulWidget {
  final VersionSourceCardData data;

  const _ServerSourceChip({required this.data});

  @override
  State<_ServerSourceChip> createState() => _ServerSourceChipState();
}

class _ServerSourceChipState extends State<_ServerSourceChip> {
  bool _loading = false;

  Future<void> _selectSource() async {
    final data = widget.data;
    if (_loading || data.isCurrent || data.selected || data.onTap == null) {
      return;
    }

    setState(() => _loading = true);
    try {
      await data.onTap!();
      if (mounted) Navigator.of(context).pop();
    } catch (_) {
      if (mounted) {
        setState(() => _loading = false);
        showAppSnackBar(context, '切换服务器失败', tone: AppSnackTone.error);
      }
    }
  }

  @override
  Widget build(BuildContext context) {
    final data = widget.data;
    final active = data.isCurrent || data.selected;

    return Tooltip(
      message: active ? '${data.serverName}（当前选择）' : '切换到 ${data.serverName}',
      child: InkWell(
        onTap: active ? null : _selectSource,
        borderRadius: BorderRadius.circular(999),
        child: AnimatedContainer(
          duration: const Duration(milliseconds: 160),
          padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 7),
          decoration: BoxDecoration(
            color: active
                ? const Color(0xFF4F8DFF).withValues(alpha: 0.24)
                : Colors.white.withValues(alpha: 0.07),
            borderRadius: BorderRadius.circular(999),
            border: Border.all(
              color: active
                  ? const Color(0xFF4F8DFF)
                  : Colors.white.withValues(alpha: 0.12),
            ),
          ),
          child: Row(
            mainAxisSize: MainAxisSize.min,
            children: [
              if (_loading)
                const AppLoadingRing(size: 12, color: Colors.white)
              else
                Icon(
                  active ? Icons.check_circle : Icons.dns_outlined,
                  size: 14,
                  color: active ? const Color(0xFF77A7FF) : Colors.white60,
                ),
              const SizedBox(width: 6),
              Text(
                data.serverName,
                style: TextStyle(
                  color: Colors.white.withValues(alpha: active ? 1 : 0.78),
                  fontSize: 12,
                  fontWeight: active ? FontWeight.w600 : FontWeight.w500,
                ),
              ),
              if (data.isCurrent) ...[
                const SizedBox(width: 6),
                const Text(
                  '当前',
                  style: TextStyle(
                    color: Color(0xFF9FC0FF),
                    fontSize: 10,
                    fontWeight: FontWeight.w600,
                  ),
                ),
              ],
            ],
          ),
        ),
      ),
    );
  }
}