import 'package:flutter/material.dart';

/// 语言设置页
///
/// 对应 Gitea issue #9
/// TODO: 接入 l10n_sdk，实现语言切换持久化
class LanguagePage extends StatefulWidget {
  const LanguagePage({super.key});

  @override
  State<LanguagePage> createState() => _LanguagePageState();
}

class _LanguagePageState extends State<LanguagePage> {
  /// TODO: 从 l10n_sdk / Locale 读取当前语言
  String _selected = 'zh';

  static const _languages = [
    _LangOption(code: 'zh', label: '简体中文', nativeLabel: '简体中文'),
    _LangOption(code: 'en', label: '英文', nativeLabel: 'English'),
    _LangOption(code: 'zh-TW', label: '繁体中文', nativeLabel: '繁體中文'),
  ];

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('语言')),
      body: ListView.separated(
        itemCount: _languages.length,
        separatorBuilder: (_, __) => const Divider(height: 1, indent: 16),
        itemBuilder: (context, index) {
          final lang = _languages[index];
          final isSelected = _selected == lang.code;
          return ListTile(
            title: Text(lang.nativeLabel),
            subtitle: lang.label != lang.nativeLabel ? Text(lang.label) : null,
            trailing: isSelected
                ? Icon(Icons.check, color: Theme.of(context).colorScheme.primary)
                : null,
            onTap: () {
              setState(() => _selected = lang.code);
              // TODO: ref.read(localeProvider.notifier).setLocale(lang.code)
              ScaffoldMessenger.of(context).showSnackBar(
                SnackBar(content: Text('语言已切换为 ${lang.nativeLabel}（持久化待接入）')),
              );
            },
          );
        },
      ),
    );
  }
}

class _LangOption {
  const _LangOption({
    required this.code,
    required this.label,
    required this.nativeLabel,
  });

  final String code;
  final String label;
  final String nativeLabel;
}