import 'dart:io';

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

import '../../../../backend/api/commands.dart' as commands;
import '../../../../backend/discovery/model.dart';
import '../../modals/send_files_modal.dart';
import '../../modals/send_text_modal.dart';

class PeerCard extends StatefulWidget {
  const PeerCard({super.key, required this.peer});

  final Peer peer;

  @override
  State<PeerCard> createState() => _PeerCardState();
}

class _PeerCardState extends State<PeerCard> {
  bool _dragging = false;

  String? get _targetIp {
    if (widget.peer.routes.isEmpty) {
      return null;
    }
    return widget.peer.routes.values.first.ip;
  }

  Future<void> _openTextModal() async {
    final targetIp = _targetIp;
    if (targetIp == null || !mounted) {
      return;
    }
    await showDialog<void>(
      context: context,
      builder: (_) => SendTextModal(peer: widget.peer, targetIp: targetIp),
    );
  }

  Future<void> _openFilesModal(List<String> files) async {
    final targetIp = _targetIp;
    if (targetIp == null || !mounted) {
      return;
    }

    await showDialog<void>(
      context: context,
      builder: (_) => SendFilesModal(
        peer: widget.peer,
        targetIp: targetIp,
        initialPaths: files,
      ),
    );
  }

  bool get _enableDragDrop =>
      Platform.isLinux || Platform.isWindows || Platform.isMacOS;

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    final targetIp = _targetIp;

    final card = Card(
      clipBehavior: Clip.antiAlias,
      shape: RoundedRectangleBorder(
        borderRadius: BorderRadius.circular(18),
        side: BorderSide(
          color: _dragging
              ? theme.colorScheme.primary
              : theme.colorScheme.outlineVariant,
          width: _dragging ? 2 : 1,
        ),
      ),
      child: Padding(
        padding: const EdgeInsets.all(14),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Row(
              children: [
                CircleAvatar(
                  backgroundColor: theme.colorScheme.primaryContainer,
                  child: Icon(
                    _iconForOs(widget.peer.os),
                    color: theme.colorScheme.onPrimaryContainer,
                  ),
                ),
                const SizedBox(width: 10),
                Expanded(
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      Text(
                        widget.peer.name,
                        maxLines: 1,
                        overflow: TextOverflow.ellipsis,
                        style: theme.textTheme.titleMedium,
                      ),
                      Text(
                        targetIp ?? '无路由',
                        style: theme.textTheme.bodySmall?.copyWith(
                          color: theme.colorScheme.onSurfaceVariant,
                        ),
                      ),
                    ],
                  ),
                ),
              ],
            ),
            const SizedBox(height: 10),
            Wrap(
              spacing: 8,
              runSpacing: 8,
              children: [
                Chip(
                  avatar: const Icon(Icons.shield_rounded, size: 16),
                  label: Text(widget.peer.enableTls ? 'TLS on' : 'TLS off'),
                ),
                if (widget.peer.trustMismatch)
                  const Chip(
                    avatar: Icon(Icons.warning_amber_rounded, size: 16),
                    label: Text('Trust Mismatch'),
                  ),
                FutureBuilder<bool>(
                  future: commands.isTrusted(peerId: widget.peer.id),
                  builder: (context, snapshot) {
                    final trusted = snapshot.data ?? false;
                    return Chip(
                      avatar: Icon(
                        trusted
                            ? Icons.verified_user_rounded
                            : Icons.gpp_maybe_rounded,
                        size: 16,
                      ),
                      label: Text(trusted ? 'Trusted' : 'Untrusted'),
                    );
                  },
                ),
                Chip(
                  avatar: const Icon(Icons.hub_rounded, size: 16),
                  label: Text('${widget.peer.routes.length} routes'),
                ),
              ],
            ),
            const Spacer(),
            if (_enableDragDrop && _dragging)
              Container(
                width: double.infinity,
                padding: const EdgeInsets.symmetric(vertical: 12),
                decoration: BoxDecoration(
                  borderRadius: BorderRadius.circular(12),
                  color: theme.colorScheme.primaryContainer.withValues(
                    alpha: 0.55,
                  ),
                ),
                child: const Center(child: Text('释放后发送文件')),
              ),
            Row(
              children: [
                Expanded(
                  child: FilledButton.tonalIcon(
                    onPressed: targetIp == null ? null : _openTextModal,
                    icon: const Icon(Icons.chat_bubble_rounded),
                    label: const Text('文本'),
                  ),
                ),
                const SizedBox(width: 8),
                Expanded(
                  child: FilledButton.icon(
                    onPressed: targetIp == null
                        ? null
                        : () => _openFilesModal(const []),
                    icon: const Icon(Icons.upload_file_rounded),
                    label: const Text('文件/文件夹'),
                  ),
                ),
              ],
            ),
            const SizedBox(height: 8),
            FutureBuilder<bool>(
              future: commands.isTrusted(peerId: widget.peer.id),
              builder: (context, snapshot) {
                final trusted = snapshot.data ?? false;
                return SizedBox(
                  width: double.infinity,
                  child: OutlinedButton.icon(
                    onPressed: () async {
                      if (trusted) {
                        await commands.untrustPeer(peerId: widget.peer.id);
                      } else {
                        await commands.trustPeer(peerId: widget.peer.id);
                      }
                      if (mounted) {
                        setState(() {});
                      }
                    },
                    icon: Icon(
                      trusted
                          ? Icons.verified_user_rounded
                          : Icons.gpp_maybe_rounded,
                    ),
                    label: Text(trusted ? '取消信任' : '设为信任设备'),
                  ),
                );
              },
            ),
            if (targetIp == null)
              Padding(
                padding: const EdgeInsets.only(top: 8),
                child: Text(
                  '该设备暂无可用传输路由',
                  style: theme.textTheme.bodySmall?.copyWith(
                    color: theme.colorScheme.error,
                  ),
                ),
              ),
          ],
        ),
      ),
    );

    if (!_enableDragDrop) {
      return card;
    }

    return DropTarget(
      onDragEntered: (_) => setState(() => _dragging = true),
      onDragExited: (_) => setState(() => _dragging = false),
      onDragDone: (details) {
        final files = details.files
            .map((f) => f.path)
            .where((e) => e.isNotEmpty)
            .toList();
        setState(() => _dragging = false);
        if (files.isNotEmpty) {
          _openFilesModal(files);
        }
      },
      child: card,
    );
  }

  IconData _iconForOs(String os) {
    final normalized = os.toLowerCase();
    if (normalized.contains('windows')) {
      return Icons.laptop_windows_rounded;
    }
    if (normalized.contains('mac') || normalized.contains('darwin')) {
      return Icons.laptop_mac_rounded;
    }
    if (normalized.contains('linux')) {
      return Icons.computer_rounded;
    }
    if (normalized.contains('android')) {
      return Icons.phone_android_rounded;
    }
    if (normalized.contains('ios') || normalized.contains('iphone')) {
      return Icons.phone_iphone_rounded;
    }
    return Platform.isAndroid
        ? Icons.devices_rounded
        : Icons.device_hub_rounded;
  }
}