// settings_page.dart — 设置（desktop 一级页）
//
// 三组：连接（开机自启/自动连接/智能分流/kill-switch 开关）· 外观（语言/深色）·
// 关于（协议/检查更新/版本 + Web 用户中心链接）。购买/订单入口已归 Account 页。
import 'dart:io';

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

import '../l10n/app_text.dart';
import '../pangolin_theme.dart';
import '../services/web_launch.dart';
import '../state/app_providers.dart';
import '../state/settings_provider.dart';
import '../state/update_provider.dart';
import '../widgets/pangolin_icons.dart';
import '../widgets/pangolin_toast.dart';

/// 「检查更新」手动触发:拉取 `$kApiBaseUrl/version`,失败/无更新走轻提示,
/// 有更新则清掉「已忽略版本」→ 顶部更新 banner 显示 + toast(不弹窗)。
Future<void> _checkForUpdate(BuildContext context, WidgetRef ref, AppText t) async {
  final info = await ref.read(updateProvider.notifier).forceCheck();
  if (!context.mounted) return;
  if (info == null) {
    showPangolinToast(context, t.updateCheckFailed);
    return;
  }
  if (!info.hasUpdate) {
    showPangolinToast(context, t.updateUpToDate);
    return;
  }
  // 有更新:清掉「已忽略版本」→ 顶部 banner 重新显示(不弹窗);toast 提示一下。
  // 强制更新由 home_shell 的 listen 走不可关闭弹窗,这里无需处理。
  ref.read(dismissedUpdateVersionProvider.notifier).state = null;
  showPangolinToast(context, t.updateAvailableTitle(info.latestVersion));
}

class SettingsPage extends ConsumerWidget {
  const SettingsPage({super.key});

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final c = context.pangolin;
    final t = ref.watch(appTextProvider);
    final lang = ref.watch(localeProvider);
    final mode = ref.watch(themeModeProvider);
    final isDark = mode == ThemeMode.dark;
    final s = ref.watch(settingsProvider);
    final settings = ref.read(settingsProvider.notifier);
    final version = ref.watch(appVersionProvider).valueOrNull ?? '…';

    Widget sw(bool v, ValueChanged<bool> on) =>
        Switch(value: v, activeThumbColor: c.accent, onChanged: on);

    return SingleChildScrollView(
      padding: const EdgeInsets.fromLTRB(32, 16, 32, 24),
      child: ConstrainedBox(
        constraints: const BoxConstraints(maxWidth: 560),
        child: Column(crossAxisAlignment: CrossAxisAlignment.stretch, children: [
          // ① 连接（功能开关组；开机自启是桌面端登录项概念,iOS/Android 无此能力,仅桌面显示）
          _SectionLabel(text: t.settingsGroupConn),
          _Card(children: [
            if (Platform.isMacOS || Platform.isWindows || Platform.isLinux)
              _Row(title: t.autostart, sub: t.autostartSub, right: sw(s.autostart, settings.setAutostart)),
            _Row(title: t.autoConnect, sub: t.autoConnectSub, right: sw(s.autoConnect, settings.setAutoConnect)),
            _Row(title: t.smartRoute, sub: t.smartRouteSub, right: sw(s.smartRoute, settings.setSmartRoute)),
            _Row(title: t.killSwitch, sub: t.killSwitchSub, last: true, right: sw(s.killSwitch, settings.setKillSwitch)),
          ]),
          const SizedBox(height: 20),
          // ② 外观（语言 + 深色）
          _SectionLabel(text: t.settingsGroupAppearance),
          _Card(children: [
            _Row(title: t.language, right: _LangSwitch(lang: lang, onPick: (l) => ref.read(localeProvider.notifier).set(l))),
            _Row(
              title: t.darkAppearance,
              sub: isDark ? t.stateOn : t.followLight,
              last: true,
              right: sw(isDark, (v) => ref.read(themeModeProvider.notifier).state = v ? ThemeMode.dark : ThemeMode.light),
            ),
          ]),
          const SizedBox(height: 20),
          // ③ 关于（协议 + 检查更新 + 版本 + 底部 Web 用户中心链接）
          _SectionLabel(text: t.settingsGroupAbout),
          _Card(children: [
            _Row(title: t.protocol, right: Text('REALITY / Hysteria2', style: PangolinText.mono.copyWith(fontSize: 13, color: c.fg3))),
            _Row(title: t.checkUpdate, right: Icon(PangolinIcons.chevronRight, size: 18, color: c.fg3), onTap: () => _checkForUpdate(context, ref, t)),
            _Row(title: 'Version', right: Text(version, style: PangolinText.mono.copyWith(fontSize: 13, color: c.fg3))),
            _Row(title: t.webUserCenter, last: true, right: Icon(PangolinIcons.externalLink, size: 18, color: c.fg3), onTap: () => openWebUserCenter(ref)),
          ]),
        ]),
      ),
    );
  }
}

class _SectionLabel extends StatelessWidget {
  const _SectionLabel({required this.text});
  final String text;
  @override
  Widget build(BuildContext context) {
    final c = context.pangolin;
    return Padding(
      padding: const EdgeInsets.fromLTRB(4, 0, 4, 10),
      child: Text(text, style: PangolinText.sm.copyWith(color: c.fg2, fontWeight: FontWeight.w700, fontSize: 13)),
    );
  }
}

class _Card extends StatelessWidget {
  const _Card({required this.children});
  final List<Widget> children;
  @override
  Widget build(BuildContext context) {
    final c = context.pangolin;
    return Container(
      decoration: BoxDecoration(
        color: c.surface,
        border: Border.all(color: c.border),
        borderRadius: BorderRadius.circular(PangolinRadius.lg),
        boxShadow: PangolinShadow.sm,
      ),
      clipBehavior: Clip.antiAlias,
      child: Column(children: children),
    );
  }
}

class _Row extends StatelessWidget {
  const _Row({required this.title, this.sub, required this.right, this.last = false, this.onTap});
  final String title;
  final String? sub;
  final Widget right;
  final bool last;
  final VoidCallback? onTap;

  @override
  Widget build(BuildContext context) {
    final c = context.pangolin;
    return InkWell(
      onTap: onTap,
      child: Container(
        padding: const EdgeInsets.symmetric(horizontal: 18, vertical: 14),
        decoration: BoxDecoration(
          border: last ? null : Border(bottom: BorderSide(color: c.border)),
        ),
        child: Row(children: [
          Expanded(
            child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
              Text(title, style: PangolinText.body.copyWith(color: c.fg1, fontSize: 14, fontWeight: FontWeight.w500)),
              if (sub != null) Text(sub!, style: PangolinText.caption.copyWith(color: c.fg3)),
            ]),
          ),
          right,
        ]),
      ),
    );
  }
}

class _LangSwitch extends StatelessWidget {
  const _LangSwitch({required this.lang, required this.onPick});
  final AppLang lang;
  final ValueChanged<AppLang> onPick;

  @override
  Widget build(BuildContext context) {
    final c = context.pangolin;
    // 6 种语言用下拉(段控横排会挤)。当前语言以本地名 + 下拉箭头展示。
    return PopupMenuButton<AppLang>(
      initialValue: lang,
      onSelected: onPick,
      color: c.surface,
      elevation: 8,
      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(PangolinRadius.md)),
      itemBuilder: (_) => [
        for (final l in AppLang.values)
          PopupMenuItem<AppLang>(
            value: l,
            height: 42,
            child: Text(l.nativeLabel,
                style: PangolinText.caption.copyWith(
                    color: l == lang ? c.accent : c.fg1,
                    fontWeight: l == lang ? FontWeight.w700 : FontWeight.w500,
                    fontSize: 13)),
          ),
      ],
      child: Container(
        padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 6),
        decoration:
            BoxDecoration(color: c.bgSubtle, borderRadius: BorderRadius.circular(PangolinRadius.full)),
        child: Row(mainAxisSize: MainAxisSize.min, children: [
          Text(lang.nativeLabel,
              style: PangolinText.caption
                  .copyWith(color: c.fg2, fontWeight: FontWeight.w700, fontSize: 12)),
          const SizedBox(width: 4),
          Icon(PangolinIcons.chevronDown, size: 14, color: c.fg3),
        ]),
      ),
    );
  }
}