import 'package:flutter/material.dart' hide BackButton;

import '../../../../core/di/injection.dart';
import '../../../../core/theme/design_tokens.dart';
import '../../../../shared/widgets/app_button.dart';
import '../../../../shared/widgets/toast/toast.dart';
import '../../../../shared/widgets/toast/toast_type.dart';
import '../../data/calendar_api.dart';

class CalendarShareDialog extends StatefulWidget {
  final String eventId;
  final String eventTitle;
  final bool canInvite;
  final bool canEdit;

  const CalendarShareDialog({
    super.key,
    required this.eventId,
    required this.eventTitle,
    this.canInvite = false,
    this.canEdit = false,
  });

  static Future<void> show(
    BuildContext context,
    String eventId,
    String eventTitle, {
    bool canInvite = false,
    bool canEdit = false,
  }) {
    return showModalBottomSheet(
      context: context,
      isScrollControlled: true,
      backgroundColor: Colors.transparent,
      builder: (context) => CalendarShareDialog(
        eventId: eventId,
        eventTitle: eventTitle,
        canInvite: canInvite,
        canEdit: canEdit,
      ),
    );
  }

  @override
  State<CalendarShareDialog> createState() => _CalendarShareDialogState();
}

class _CalendarShareDialogState extends State<CalendarShareDialog> {
  final _emailController = TextEditingController();
  bool _permissionView = true;
  bool _permissionEdit = false;
  bool _permissionInvite = false;
  bool _isLoading = false;

  @override
  void dispose() {
    _emailController.dispose();
    super.dispose();
  }

  Future<void> _handleShare() async {
    final email = _emailController.text.trim();
    if (email.isEmpty) {
      Toast.show(context, '请输入邮箱地址', type: ToastType.error);
      return;
    }

    setState(() => _isLoading = true);

    try {
      final api = sl<CalendarApi>();
      await api.share(
        widget.eventId,
        email: email,
        view: _permissionView,
        edit: _permissionEdit,
        invite: _permissionInvite,
      );
      if (mounted) {
        Toast.show(context, '邀请已发送', type: ToastType.success);
        Navigator.of(context).pop();
      }
    } catch (e) {
      if (mounted) {
        Toast.show(context, '发送邀请失败', type: ToastType.error);
      }
    } finally {
      if (mounted) {
        setState(() => _isLoading = false);
      }
    }
  }

  @override
  Widget build(BuildContext context) {
    return Container(
      padding: EdgeInsets.only(
        bottom: MediaQuery.of(context).viewInsets.bottom,
      ),
      decoration: BoxDecoration(
        color: AppColors.background,
        borderRadius: const BorderRadius.vertical(
          top: Radius.circular(AppRadius.lg),
        ),
      ),
      child: SafeArea(
        child: Padding(
          padding: const EdgeInsets.all(AppSpacing.lg),
          child: Column(
            mainAxisSize: MainAxisSize.min,
            crossAxisAlignment: CrossAxisAlignment.stretch,
            children: [
              Row(
                mainAxisAlignment: MainAxisAlignment.spaceBetween,
                children: [
                  const Text(
                    '分享日历',
                    style: TextStyle(fontSize: 18, fontWeight: FontWeight.w600),
                  ),
                  IconButton(
                    onPressed: () => Navigator.of(context).pop(),
                    icon: const Icon(Icons.close),
                  ),
                ],
              ),
              const SizedBox(height: AppSpacing.md),
              Text(widget.eventTitle, style: const TextStyle(fontSize: 16)),
              const SizedBox(height: AppSpacing.lg),
              TextField(
                controller: _emailController,
                decoration: InputDecoration(
                  labelText: '邮箱地址',
                  hintText: '输入对方的邮箱',
                  border: OutlineInputBorder(
                    borderRadius: BorderRadius.circular(AppRadius.md),
                  ),
                ),
                keyboardType: TextInputType.emailAddress,
              ),
              const SizedBox(height: AppSpacing.lg),
              const Text('权限设置', style: TextStyle(fontWeight: FontWeight.w600)),
              const SizedBox(height: AppSpacing.sm),
              _buildPermissionSwitch('查看', '可以查看此日历事件（必选）', true, null),
              _buildPermissionSwitch(
                '编辑',
                '可以编辑此日历事件',
                _permissionEdit,
                widget.canEdit
                    ? (v) => setState(() => _permissionEdit = v)
                    : null,
              ),
              _buildPermissionSwitch(
                '邀请',
                '可以邀请其他人',
                _permissionInvite,
                widget.canInvite
                    ? (v) => setState(() => _permissionInvite = v)
                    : null,
              ),
              const SizedBox(height: AppSpacing.lg),
              AppButton(
                text: '发送邀请',
                onPressed: _isLoading ? null : _handleShare,
                isLoading: _isLoading,
              ),
            ],
          ),
        ),
      ),
    );
  }

  Widget _buildPermissionSwitch(
    String title,
    String description,
    bool value,
    ValueChanged<bool>? onChanged,
  ) {
    final enabled = onChanged != null;
    return Padding(
      padding: const EdgeInsets.symmetric(vertical: AppSpacing.xs),
      child: Row(
        children: [
          Expanded(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Text(
                  title,
                  style: TextStyle(color: enabled ? null : Colors.grey),
                ),
                Text(
                  description,
                  style: TextStyle(
                    fontSize: 12,
                    color: enabled ? Colors.grey : Colors.grey.shade400,
                  ),
                ),
              ],
            ),
          ),
          Switch(value: value, onChanged: enabled ? onChanged : null),
        ],
      ),
    );
  }
}