import 'package:flutter/material.dart';
import 'package:go_router/go_router.dart';
import '../../../../core/theme/design_tokens.dart';
import '../../../../shared/widgets/back_title_page_header.dart';
import '../../../../shared/widgets/app_input.dart';
import '../../../../shared/widgets/link_button.dart';
import '../../../../shared/widgets/toast/toast.dart';
import '../../../../shared/widgets/toast/toast_type.dart';

class AddContactScreen extends StatefulWidget {
  final String? contactId;

  const AddContactScreen({super.key, this.contactId});

  @override
  State<AddContactScreen> createState() => _AddContactScreenState();
}

class _AddContactScreenState extends State<AddContactScreen> {
  final _nameController = TextEditingController();
  final _phoneController = TextEditingController();
  final _remarkController = TextEditingController();

  bool get isEditing => widget.contactId != null;

  @override
  void dispose() {
    _nameController.dispose();
    _phoneController.dispose();
    _remarkController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: AppColors.surfaceSecondary,
      resizeToAvoidBottomInset: false,
      body: SafeArea(
        maintainBottomViewPadding: true,
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: [
            BackTitlePageHeader(
              title: isEditing ? '编辑联系人' : '添加联系人',
              onBack: () => context.pop(),
              trailing: _buildConfirmButton(),
            ),
            Expanded(
              child: SingleChildScrollView(
                padding: const EdgeInsets.fromLTRB(20, 8, 20, 20),
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.stretch,
                  children: [
                    _buildAvatarSection(),
                    const SizedBox(height: 14),
                    _buildFormCard(),
                    if (isEditing) ...[
                      const SizedBox(height: 14),
                      _buildDeleteRow(),
                    ],
                  ],
                ),
              ),
            ),
          ],
        ),
      ),
    );
  }

  Widget _buildConfirmButton() {
    return SizedBox(
      width: AppSpacing.xxl * 2,
      height: AppSpacing.xxl * 2,
      child: TextButton(
        onPressed: _handleConfirm,
        style: TextButton.styleFrom(
          padding: const EdgeInsets.all(AppSpacing.none),
          backgroundColor: AppColors.surfaceInfo,
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(AppRadius.full),
            side: const BorderSide(color: AppColors.borderQuaternary),
          ),
        ),
        child: const Icon(
          Icons.check,
          size: AppSpacing.lg,
          color: AppColors.blue600,
        ),
      ),
    );
  }

  Widget _buildAvatarSection() {
    return Center(
      child: Container(
        width: 72,
        height: 72,
        decoration: BoxDecoration(
          color: AppColors.surfaceInfoLight,
          borderRadius: BorderRadius.circular(36),
          border: Border.all(color: Colors.transparent),
        ),
        child: const Icon(
          Icons.person_outline,
          size: 24,
          color: AppColors.slate400,
        ),
      ),
    );
  }

  Widget _buildFormCard() {
    return Container(
      padding: const EdgeInsets.all(14),
      decoration: BoxDecoration(
        color: AppColors.white,
        borderRadius: BorderRadius.circular(16),
        border: Border.all(color: AppColors.messageCardBorder),
      ),
      child: Column(
        children: [
          AppInput(label: '昵称', hint: '请输入昵称', controller: _nameController),
          const SizedBox(height: 14),
          AppInput(
            label: '手机号',
            hint: '+86 请输入 11 位手机号',
            controller: _phoneController,
            keyboardType: TextInputType.phone,
          ),
          const SizedBox(height: 14),
          AppInput(
            label: '备注',
            hint: '请输入备注',
            controller: _remarkController,
            maxLines: 3,
          ),
        ],
      ),
    );
  }

  Widget _buildDeleteRow() {
    return Padding(
      padding: const EdgeInsets.only(bottom: AppSpacing.sm),
      child: LinkButton(
        text: '删除联系人',
        onTap: _handleDelete,
        foregroundColor: AppColors.red600,
      ),
    );
  }

  void _handleConfirm() {
    final name = _nameController.text.trim();
    final phone = _phoneController.text.trim();

    if (name.isEmpty || phone.isEmpty) {
      Toast.show(context, '请填写昵称和手机号', type: ToastType.warning);
      return;
    }

    // TODO: Implement save logic
    context.pop();
  }

  void _handleDelete() {
    showDialog(
      context: context,
      builder: (context) => AlertDialog(
        title: const Text('删除联系人'),
        content: const Text('确定要删除此联系人吗？'),
        actions: [
          TextButton(
            onPressed: () => Navigator.pop(context),
            child: const Text('取消'),
          ),
          TextButton(
            onPressed: () {
              Navigator.pop(context);
              // TODO: Implement delete logic
              context.pop();
            },
            child: const Text('删除', style: TextStyle(color: AppColors.red600)),
          ),
        ],
      ),
    );
  }
}