import 'dart:io';

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

import 'package:arcx/app/app_theme.dart';
import 'package:arcx/core/constants/app_defaults.dart';
import 'package:arcx/data/local/models/models.dart';
import 'package:arcx/features/profile/application/profile_controller.dart';

class ProfileEditDialog extends ConsumerStatefulWidget {
  const ProfileEditDialog({super.key});

  @override
  ConsumerState<ProfileEditDialog> createState() => _ProfileEditDialogState();
}

class _ProfileEditDialogState extends ConsumerState<ProfileEditDialog> {
  late final TextEditingController _controller;
  bool _saving = false;

  @override
  void initState() {
    super.initState();
    final profile = ref.read(profileProvider).value;
    _controller = TextEditingController(text: profile?.nickname ?? '');
  }

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

  @override
  Widget build(BuildContext context) {
    final profile = ref.watch(profileProvider).value;
    return AlertDialog(
      title: const Text('编辑个人资料'),
      content: SingleChildScrollView(
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            GestureDetector(
              onTap: _saving ? null : () => _pickAvatar(context),
              child: _AvatarPreview(profile: profile),
            ),
            if (profile?.avatarSource == AvatarSource.localFile)
              TextButton.icon(
                onPressed: _saving ? null : _resetAvatar,
                icon: const Icon(Icons.refresh, size: 18),
                label: const Text('恢复默认头像'),
              ),
            const SizedBox(height: 8),
            TextField(
              controller: _controller,
              maxLength: 12,
              decoration: const InputDecoration(
                labelText: '昵称',
                hintText: '1~12 个字符',
                counterText: '',
              ),
            ),
          ],
        ),
      ),
      actions: [
        TextButton(
          onPressed: _saving ? null : () => Navigator.pop(context),
          child: const Text('取消'),
        ),
        FilledButton(
          onPressed: _saving ? null : _save,
          child: const Text('保存'),
        ),
      ],
    );
  }

  Future<void> _pickAvatar(BuildContext context) async {
    final choice = await showModalBottomSheet<AvatarAction>(
      context: context,
      builder: (_) => SafeArea(
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            ListTile(
              leading: const Icon(Icons.photo_outlined),
              title: const Text('从相册选择'),
              onTap: () => Navigator.pop(context, AvatarAction.gallery),
            ),
            ListTile(
              leading: const Icon(Icons.camera_alt_outlined),
              title: const Text('拍摄照片'),
              onTap: () => Navigator.pop(context, AvatarAction.camera),
            ),
          ],
        ),
      ),
    );
    if (choice == null) return;
    setState(() => _saving = true);
    await ref
        .read(profileProvider.notifier)
        .updateAvatar(fromCamera: choice == AvatarAction.camera);
    if (mounted) setState(() => _saving = false);
  }

  Future<void> _resetAvatar() async {
    setState(() => _saving = true);
    await ref.read(profileProvider.notifier).resetAvatar();
    if (mounted) setState(() => _saving = false);
  }

  Future<void> _save() async {
    final name = _controller.text.trim();
    if (name.isEmpty) {
      ScaffoldMessenger.of(
        context,
      ).showSnackBar(const SnackBar(content: Text('昵称不能为空')));
      return;
    }
    setState(() => _saving = true);
    await ref.read(profileProvider.notifier).updateNickname(name);
    if (mounted) {
      setState(() => _saving = false);
      Navigator.pop(context);
    }
  }
}

enum AvatarAction { gallery, camera }

class _AvatarPreview extends StatelessWidget {
  const _AvatarPreview({required this.profile});
  final UserProfile? profile;

  @override
  Widget build(BuildContext context) {
    final p = profile;
    final ImageProvider image;
    if (p != null &&
        p.avatarSource == AvatarSource.localFile &&
        p.avatarLocalPath != null &&
        p.avatarLocalPath!.isNotEmpty) {
      image = FileImage(File(p.avatarLocalPath!));
    } else {
      image = const AssetImage(AppDefaults.defaultAvatarAssetPath);
    }
    return Stack(
      alignment: Alignment.bottomRight,
      children: [
        CircleAvatar(
          radius: 44,
          backgroundColor: AppTheme.surfaceMuted,
          backgroundImage: image,
        ),
        Container(
          padding: const EdgeInsets.all(6),
          decoration: const BoxDecoration(
            color: AppTheme.primary,
            shape: BoxShape.circle,
          ),
          child: const Icon(Icons.edit, color: Colors.white, size: 16),
        ),
      ],
    );
  }
}