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

import '../../l10n/app_localizations.dart';
import '../../pages/auth/auth_view.dart';
import '../data/services/auth_controller.dart';
import '../theme/app_colors.dart';

/// 打开登录 / 注册页（沿用现有 Navigator 风格，不引路由库）
Future<void> openAuthPage(BuildContext context, {bool signUpMode = false}) {
  return Navigator.of(context).push(
    MaterialPageRoute<void>(builder: (_) => AuthPage(signUpMode: signUpMode)),
  );
}

/// 受限动作的登录闸：已登录返回 true；未登录弹底部提示并引导登录，返回 false。
///
/// 首页/发现/详情与非付费互动保持匿名可用；解锁、权益与消耗类动作走这里。
Future<bool> ensureSignedIn(BuildContext context) async {
  final auth = context.read<AuthController>();
  if (auth.isSignedIn) return true;

  final l10n = AppLocalizations.of(context)!;
  final go = await showModalBottomSheet<bool>(
    context: context,
    backgroundColor: AppColors.card,
    shape: const RoundedRectangleBorder(
      borderRadius: BorderRadius.vertical(top: Radius.circular(18)),
    ),
    builder: (sheetContext) => SafeArea(
      child: Padding(
        padding: const EdgeInsets.fromLTRB(20, 18, 20, 20),
        child: Column(
          mainAxisSize: MainAxisSize.min,
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Text(
              l10n.authGateTitle,
              style: const TextStyle(
                color: AppColors.onSurface,
                fontSize: 16,
                fontWeight: FontWeight.w800,
              ),
            ),
            const SizedBox(height: 6),
            Text(
              l10n.authGateMessage,
              style: const TextStyle(color: AppColors.muted, fontSize: 13),
            ),
            const SizedBox(height: 16),
            Row(
              children: [
                Expanded(
                  child: OutlinedButton(
                    onPressed: () => Navigator.of(sheetContext).pop(false),
                    child: Text(l10n.cancel),
                  ),
                ),
                const SizedBox(width: 10),
                Expanded(
                  child: FilledButton(
                    style: FilledButton.styleFrom(
                      backgroundColor: AppColors.blue,
                    ),
                    onPressed: () => Navigator.of(sheetContext).pop(true),
                    child: Text(l10n.authGateAction),
                  ),
                ),
              ],
            ),
          ],
        ),
      ),
    ),
  );

  if (go == true && context.mounted) {
    await openAuthPage(context);
    if (context.mounted) return context.read<AuthController>().isSignedIn;
  }
  return false;
}

/// 页面级登录引导，用于记录、收藏和下载等必须登录的独立页面。
class AuthGatePanel extends StatelessWidget {
  const AuthGatePanel({super.key});

  @override
  Widget build(BuildContext context) {
    final l10n = AppLocalizations.of(context)!;
    return Center(
      key: const Key('auth-gate-panel'),
      child: Padding(
        padding: const EdgeInsets.symmetric(horizontal: 32),
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            Text(
              l10n.authGateTitle,
              textAlign: TextAlign.center,
              style: const TextStyle(
                color: AppColors.onSurface,
                fontSize: 18,
                fontWeight: FontWeight.w800,
              ),
            ),
            const SizedBox(height: 8),
            Text(
              l10n.authGateMessage,
              textAlign: TextAlign.center,
              style: const TextStyle(color: AppColors.muted, fontSize: 13),
            ),
            const SizedBox(height: 18),
            FilledButton(
              onPressed: () => openAuthPage(context),
              child: Text(l10n.authGateAction),
            ),
          ],
        ),
      ),
    );
  }
}