import 'package:flutter/material.dart';
import 'package:miaoji_zhang/shared/services/push_service.dart';
import 'package:miaoji_zhang/shared/theme/app_theme.dart';
import 'package:miaoji_zhang/shared/widgets/app_controls.dart';

class PushSettingsPage extends StatefulWidget {
  const PushSettingsPage({super.key});

  @override
  State<PushSettingsPage> createState() => _PushSettingsPageState();
}

class _PushSettingsPageState extends State<PushSettingsPage> {
  final service = PushService.instance;

  @override
  void initState() {
    super.initState();
    service.addListener(_changed);
    service.refresh();
  }

  @override
  void dispose() {
    service.removeListener(_changed);
    super.dispose();
  }

  void _changed() {
    if (mounted) setState(() {});
  }

  Future<void> _toggle(String category, bool value) async {
    final ok = await service.setCategory(category, value);
    if (!ok && mounted && service.lastError != null) {
      ScaffoldMessenger.of(
        context,
      ).showSnackBar(SnackBar(content: Text(service.lastError!)));
    }
  }

  @override
  Widget build(BuildContext context) {
    final status = service.nativeStatus;
    return Scaffold(
      appBar: AppBar(title: const Text('通知设置')),
      body: ListView(
        padding: const EdgeInsets.fromLTRB(16, 8, 16, 24),
        children: [
          Card(
            child: Column(
              children: [
                _switchRow(
                  '系统通知',
                  '版本更新和重要服务状态',
                  service.preferences.system,
                  (value) => _toggle('system', value),
                ),
                const Divider(height: 1),
                _switchRow(
                  '预算提醒',
                  '预算达到 80% 或 100% 时提醒',
                  service.preferences.budget,
                  (value) => _toggle('budget', value),
                ),
                const Divider(height: 1),
                _switchRow(
                  '运营通知',
                  '活动和产品公告',
                  service.preferences.operations,
                  (value) => _toggle('operations', value),
                ),
              ],
            ),
          ),
          const SizedBox(height: 12),
          Card(
            child: Padding(
              padding: const EdgeInsets.all(16),
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  const Text(
                    '推送通道',
                    style: TextStyle(fontSize: 14, fontWeight: FontWeight.w800),
                  ),
                  const SizedBox(height: 8),
                  Text(
                    _providerLabel(status.provider),
                    style: TextStyle(color: context.jz.text2, fontSize: 12),
                  ),
                  const SizedBox(height: 4),
                  Text(
                    _statusLabel(status),
                    style: TextStyle(
                      color: status.notificationsAllowed
                          ? context.jz.text2
                          : AppTheme.orange,
                      fontSize: 12,
                    ),
                  ),
                  if (!status.notificationsAllowed) ...[
                    const SizedBox(height: 12),
                    JzActionButton(
                      label: '打开系统通知设置',
                      onPressed: service.openNotificationSettings,
                      secondary: true,
                    ),
                  ],
                ],
              ),
            ),
          ),
          if (service.loading) ...[
            const SizedBox(height: 16),
            const Center(child: CircularProgressIndicator(strokeWidth: 2)),
          ],
        ],
      ),
    );
  }

  Widget _switchRow(
    String title,
    String subtitle,
    bool value,
    ValueChanged<bool> onChanged,
  ) => Padding(
    padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
    child: Row(
      children: [
        Expanded(
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Text(title, style: const TextStyle(fontWeight: FontWeight.w700)),
              const SizedBox(height: 3),
              Text(
                subtitle,
                style: TextStyle(color: context.jz.text2, fontSize: 11.5),
              ),
            ],
          ),
        ),
        Switch(value: value, onChanged: service.loading ? null : onChanged),
      ],
    ),
  );

  String _providerLabel(String? provider) => switch (provider) {
    'huawei' => '华为 Push Kit',
    'honor' => '荣耀 Push Kit',
    'xiaomi' => '小米推送',
    'oppo' => 'OPPO 推送',
    'vivo' => 'vivo 推送',
    'meizu' => '魅族推送',
    _ => '当前设备没有可用的国产厂商通道',
  };

  String _statusLabel(PushNativeStatus status) {
    if (!status.supported) return '不支持';
    if (!status.sdkAvailable) return '当前安装包未配置对应厂商 SDK';
    if (!status.notificationsAllowed) return '系统通知权限已关闭';
    if (status.token?.isNotEmpty == true) return '已连接';
    if (status.enabled) return '正在获取厂商令牌';
    return '未启用';
  }
}