import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:service_api/service_api.dart';
import 'package:url_launcher/url_launcher.dart'; 

class SettingsScreen extends StatelessWidget {
  const SettingsScreen({super.key});

  Future<void> _launchHomepage() async {
    final Uri url = Uri.parse('https://lunaticbum.kr'); 
    if (!await launchUrl(url, mode: LaunchMode.externalApplication)) {
      debugPrint('Could not launch $url');
    }
  }

// 🔽 [신규] 기록 삭제 확인 다이얼로그
  Future<void> _confirmClearHistory(BuildContext context) async {
    final bool? confirmed = await showDialog<bool>(
      context: context,
      builder: (ctx) => AlertDialog(
        title: const Text('진단 기록 삭제'),
        content: const Text('저장된 모든 두뇌 진단 기록을 삭제하시겠습니까?\n삭제된 데이터는 복구할 수 없습니다.'),
        actions: [
          TextButton(
            onPressed: () => Navigator.pop(ctx, false),
            child: const Text('취소'),
          ),
          TextButton(
            onPressed: () => Navigator.pop(ctx, true),
            style: TextButton.styleFrom(foregroundColor: Colors.red),
            child: const Text('삭제'),
          ),
        ],
      ),
    );

    if (confirmed == true && context.mounted) {
      final identityService = context.read<IdentityService>();
      await identityService.clearAssessmentHistory();
      
      if (context.mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          const SnackBar(content: Text('진단 기록이 삭제되었습니다.')),
        );
      }
    }
  }
  
  @override
  Widget build(BuildContext context) {
    final themeNotifier = context.watch<ThemeNotifier>();
    final sessionNotifier = context.watch<SessionNotifier>();

    return Scaffold(
      appBar: AppBar(title: const Text('설정')),
      body: ListView(
        children: [
          ListTile(
            leading: Icon(
              sessionNotifier.isGuest 
                ? Icons.person_outline 
                : Icons.person_rounded
            ),
            title: Text(
              sessionNotifier.isLoading
                ? '계정 정보 로딩 중...'
                : (sessionNotifier.isGuest
                  ? '게스트 계정'
                  : sessionNotifier.session?.userName ?? '로그인됨')
            ),
            subtitle: Text(
              sessionNotifier.isLoading
                ? ''
                : (sessionNotifier.isGuest
                  ? '진행 상황을 저장하려면 로그인하세요.'
                  : (sessionNotifier.session?.email ?? '소셜 계정'))
            ),
          ),
          
          if (!sessionNotifier.isLoading) 
            if (sessionNotifier.isGuest)
              Padding(
                padding: const EdgeInsets.symmetric(horizontal: 16.0, vertical: 8.0),
                child: Row(
                  children: [
                    Expanded(
                      child: OutlinedButton.icon(
                        icon: const Icon(Icons.g_mobiledata),
                        label: const Text('Google 로그인'),
                        onPressed: () {
                          sessionNotifier.login('google');
                        },
                      ),
                    ),
                    const SizedBox(width: 10),
                    Expanded(
                      child: OutlinedButton.icon(
                        icon: const Icon(Icons.apple),
                        label: const Text('Apple 로그인'),
                        onPressed: () {
                          sessionNotifier.login('apple');
                        },
                      ),
                    ),
                  ],
                ),
              )
            else
              ListTile(
                title: const Text('로그아웃', style: TextStyle(color: Colors.red)),
                leading: const Icon(Icons.logout, color: Colors.red),
                onTap: () {
                  sessionNotifier.logout();
                },
              ),

          const Divider(),
          
          SwitchListTile(
            title: const Text('다크 모드'),
            secondary: const Icon(Icons.dark_mode_outlined),
            value: themeNotifier.isDarkMode, 
            onChanged: (newValue) {
              themeNotifier.toggleTheme(newValue);
            },
          ),
          
          // 🔽 [신규] 글자 크기 조절 섹션
          ListTile(
            title: const Text('글자 크기'),
            subtitle: Text(_getScaleLabel(themeNotifier.textScaleFactor)),
            leading: const Icon(Icons.format_size),
          ),
          Padding(
            padding: const EdgeInsets.symmetric(horizontal: 24.0),
            child: Column(
              children: [
                Slider(
                  value: themeNotifier.textScaleFactor,
                  min: 0.85,
                  max: 1.5,
                  divisions: 4, 
                  label: _getScaleLabel(themeNotifier.textScaleFactor),
                  onChanged: (value) {
                    themeNotifier.setTextScale(value);
                  },
                ),
                Row(
                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
                  children: const [
                    Text("작게", style: TextStyle(fontSize: 12)),
                    Text("표준", style: TextStyle(fontSize: 12)),
                    Text("크게", style: TextStyle(fontSize: 12)),
                    Text("더 크게", style: TextStyle(fontSize: 12)),
                    Text("완전 크게", style: TextStyle(fontSize: 12)),
                  ],
                ),
                const SizedBox(height: 16),
              ],
            ),
          ),

          const Divider(),

          // 🔽 [신규] 데이터 관리 섹션
          const Padding(
            padding: EdgeInsets.fromLTRB(16.0, 16.0, 16.0, 8.0),
            child: Text(
              '데이터 관리',
              style: TextStyle(fontSize: 16, fontWeight: FontWeight.bold),
            ),
          ),
          ListTile(
            leading: const Icon(Icons.delete_outline, color: Colors.red),
            title: const Text('진단 기록 삭제', style: TextStyle(color: Colors.red)),
            subtitle: const Text('저장된 두뇌 건강 진단 기록을 모두 지웁니다.'),
            onTap: () => _confirmClearHistory(context),
          ),

          const Divider(),

          const Padding(
            padding: EdgeInsets.fromLTRB(16.0, 16.0, 16.0, 8.0),
            child: Text(
              '앱 테마 색상',
              style: TextStyle(fontSize: 16, fontWeight: FontWeight.bold),
            ),
          ),
          
          ...appColors.entries.map((entry) {
            final String colorName = entry.key;
            final MaterialColor color = entry.value;

            return ListTile(
              leading: CircleAvatar(
                backgroundColor: color,
              ),
              title: Text(colorName),
              trailing: (themeNotifier.currentColor == color)
                  ? Icon(Icons.check, color: Theme.of(context).colorScheme.secondary) 
                  : null,
              onTap: () {
                themeNotifier.setTheme(colorName);
              },
            );
          }),

          const Divider(),

          ListTile(
            leading: const Icon(Icons.description_outlined),
            title: const Text('오픈소스 라이선스'),
            onTap: () {
              showLicensePage(
                context: context,
                applicationName: '스도쿠 게임',
                applicationVersion: '1.0.0', 
                applicationIcon: const Icon(Icons.apps_rounded, size: 64),
              );
            },
          ),
          
          ListTile(
            leading: const Icon(Icons.info_outline),
            title: const Text('앱 정보'),
            onTap: () {
              showAboutDialog(
                context: context,
                applicationName: '스도쿠 게임',
                applicationVersion: '1.0.0',
                applicationIcon: const Icon(Icons.apps_rounded, size: 48),
                children: [
                  const SizedBox(height: 16),
                  InkWell(
                    onTap: _launchHomepage, 
                    child: Padding(
                      padding: const EdgeInsets.symmetric(vertical: 8.0), 
                      child: Text(
                        '© 2025 lunaticbum',
                        textAlign: TextAlign.center,
                        style: TextStyle(
                          color: Theme.of(context).colorScheme.primary,
                          decoration: TextDecoration.underline,
                        ),
                      ),
                    ),
                  ),
                ],
              );
            },
          ),
        ],
      ),
    );
  }

  String _getScaleLabel(double scale) {
    if (scale <= 0.9) return "작게";
    if (scale <= 1.05) return "표준";
    if (scale <= 1.2) return "크게";
    if (scale <= 1.3) return "더 크게";
    return "완전 크게";
  }
}