// ad_reward_dialog.dart — 免费额度耗尽后的「加时」入口(占位广告流程 + 桌面升级提示)
//
// 移动端:弹占位广告(「广告播放中…」→ 3s 假播放 → 调 /v1/ads/unlock 加时 → 显示奖励)。
// 桌面端(Windows/macOS):免费版硬 10 分钟/天不可延,无广告——弹「去移动端看广告或升级」。
// 接真广告 SDK(AdMob 激励视频)时,只需把 onWatch 换成「真播完再回调」即可,UI 不变。
import 'dart:async';

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

import '../l10n/app_text.dart';
import '../pangolin_theme.dart';
import '../state/app_providers.dart';
import '../state/quota_provider.dart';
import 'pangolin_icons.dart';

/// 展示加时流程。isDesktop=true 走升级提示(无广告),否则走占位广告加时。
Future<void> showQuotaAdFlow(BuildContext context, WidgetRef ref, {required bool isDesktop}) async {
  final t = ref.read(appTextProvider);
  if (isDesktop) {
    await showDialog<void>(context: context, builder: (_) => _DesktopUpgradeDialog(t: t));
    return;
  }
  await showDialog<void>(
    context: context,
    barrierDismissible: false,
    builder: (_) => _PlaceholderAdDialog(
      t: t,
      onWatch: () => ref.read(quotaProvider.notifier).watchAd(),
    ),
  );
}

/// 桌面版:免费硬 10 分钟不可延,提示去移动端加时或升级会员。
class _DesktopUpgradeDialog extends StatelessWidget {
  const _DesktopUpgradeDialog({required this.t});
  final AppText t;

  @override
  Widget build(BuildContext context) {
    final c = context.pangolin;
    return AlertDialog(
      backgroundColor: c.surface,
      title: Text(t.quotaDesktopTitle,
          style: PangolinText.body.copyWith(color: c.fg1, fontWeight: FontWeight.w700)),
      content: Text(t.quotaDesktopBody, style: PangolinText.sm.copyWith(color: c.fg2)),
      actions: [
        TextButton(
          onPressed: () => Navigator.of(context).pop(),
          child: Text(t.gotIt, style: PangolinText.sm.copyWith(color: c.accent, fontWeight: FontWeight.w700)),
        ),
      ],
    );
  }
}

enum _AdPhase { playing, done, failed }

/// 移动端占位激励广告:播放中 → 加时成功/失败。成功后短暂展示奖励再自动关闭。
class _PlaceholderAdDialog extends StatefulWidget {
  const _PlaceholderAdDialog({required this.t, required this.onWatch});
  final AppText t;
  final Future<int?> Function() onWatch;

  @override
  State<_PlaceholderAdDialog> createState() => _PlaceholderAdDialogState();
}

class _PlaceholderAdDialogState extends State<_PlaceholderAdDialog> {
  _AdPhase _phase = _AdPhase.playing;
  int _granted = 0;
  Timer? _closeTimer;

  @override
  void initState() {
    super.initState();
    _run();
  }

  Future<void> _run() async {
    // 占位「播放」3s(接真 SDK 后由激励视频完成回调替代)。
    await Future<void>.delayed(const Duration(seconds: 3));
    if (!mounted) return;
    final granted = await widget.onWatch();
    if (!mounted) return;
    setState(() {
      if (granted != null && granted > 0) {
        _phase = _AdPhase.done;
        _granted = granted;
      } else {
        _phase = _AdPhase.failed;
      }
    });
    if (_phase == _AdPhase.done) {
      _closeTimer = Timer(const Duration(milliseconds: 1300), () {
        if (mounted) Navigator.of(context).pop();
      });
    }
  }

  @override
  void dispose() {
    _closeTimer?.cancel();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    final c = context.pangolin;
    final t = widget.t;

    Widget body;
    switch (_phase) {
      case _AdPhase.playing:
        body = Column(mainAxisSize: MainAxisSize.min, children: [
          SizedBox(
            width: 34,
            height: 34,
            child: CircularProgressIndicator(color: c.accent, strokeWidth: 3),
          ),
          const SizedBox(height: 16),
          Text(t.adPlaying, style: PangolinText.sm.copyWith(color: c.fg2, fontWeight: FontWeight.w600)),
        ]);
      case _AdPhase.done:
        body = Column(mainAxisSize: MainAxisSize.min, children: [
          Icon(PangolinIcons.checkCircle, size: 40, color: c.success),
          const SizedBox(height: 14),
          Text(t.adRewarded(_granted),
              style: PangolinText.body.copyWith(color: c.success, fontWeight: FontWeight.w700)),
        ]);
      case _AdPhase.failed:
        body = Column(mainAxisSize: MainAxisSize.min, children: [
          Icon(PangolinIcons.alertTriangle, size: 36, color: c.danger),
          const SizedBox(height: 14),
          Text(t.adFailed, style: PangolinText.sm.copyWith(color: c.fg2, fontWeight: FontWeight.w600)),
          const SizedBox(height: 14),
          TextButton(
            onPressed: () => Navigator.of(context).pop(),
            child: Text(t.gotIt, style: PangolinText.sm.copyWith(color: c.accent, fontWeight: FontWeight.w700)),
          ),
        ]);
    }

    return Dialog(
      backgroundColor: c.surface,
      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(PangolinRadius.lg)),
      child: Padding(
        padding: const EdgeInsets.symmetric(horizontal: 28, vertical: 28),
        child: AnimatedSize(
          duration: PangolinMotion.base,
          child: body,
        ),
      ),
    );
  }
}