import 'package:flutter/material.dart';

import '../../core/app_keys.dart';
import '../../core/theme/app_colors.dart';
import '../../core/theme/app_dimens.dart';
import '../../core/theme/app_typography.dart';

/// `uni.showToast({ title, icon })` 的等价实现。
/// 不依赖调用方的 BuildContext，可在任意异步回调里安全使用。
void showAppToast(String title, {bool success = false}) {
  final messenger = AppKeys.scaffoldMessenger.currentState;
  if (messenger == null) return;
  messenger
    ..clearSnackBars()
    ..showSnackBar(
      SnackBar(
        content: Row(
          children: [
            if (success) ...[
              const Icon(
                Icons.check_circle,
                size: 18,
                color: AppColors.success,
              ),
              const SizedBox(width: 8),
            ],
            Expanded(
              child: Text(
                title,
                style: AppTypography.bodyMd.copyWith(color: AppColors.surface),
              ),
            ),
          ],
        ),
        backgroundColor: AppColors.inverseSurface,
        behavior: SnackBarBehavior.floating,
        margin: const EdgeInsets.all(AppSpacing.md),
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.circular(AppRadius.lg),
        ),
        duration: Duration(milliseconds: success ? 1500 : 2200),
      ),
    );
}

/// `uni.showLoading({ title })` 的等价实现，返回关闭函数。
VoidCallback showAppLoading([String title = '加载中...']) {
  final navigator = AppKeys.rootNavigator.currentState;
  if (navigator == null) return () {};
  var closed = false;
  showDialog<void>(
    context: navigator.context,
    barrierDismissible: false,
    builder: (_) => PopScope(
      canPop: false,
      child: Center(
        child: Container(
          padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 20),
          decoration: BoxDecoration(
            color: const Color(0xCC000000),
            borderRadius: BorderRadius.circular(AppRadius.lg),
          ),
          child: Column(
            mainAxisSize: MainAxisSize.min,
            children: [
              const SizedBox(
                width: 26,
                height: 26,
                child: CircularProgressIndicator(
                  strokeWidth: 2.4,
                  valueColor: AlwaysStoppedAnimation(Colors.white),
                ),
              ),
              const SizedBox(height: 12),
              Text(
                title,
                style: AppTypography.bodyMd.copyWith(color: Colors.white),
              ),
            ],
          ),
        ),
      ),
    ),
  );
  return () {
    if (closed) return;
    closed = true;
    final current = AppKeys.rootNavigator.currentState;
    if (current != null && current.canPop()) current.pop();
  };
}

/// `uni.showModal({ title, content })` 的等价实现，返回用户是否点了确认。
Future<bool> showAppConfirm({
  required String title,
  required String content,
  String confirmText = '确定',
  String cancelText = '取消',
  bool destructive = false,
}) async {
  final navigator = AppKeys.rootNavigator.currentState;
  if (navigator == null) return false;
  final result = await showDialog<bool>(
    context: navigator.context,
    builder: (ctx) => AlertDialog(
      backgroundColor: AppColors.surfaceContainerLowest,
      surfaceTintColor: Colors.transparent,
      shape: RoundedRectangleBorder(
        borderRadius: BorderRadius.circular(AppRadius.xl),
      ),
      title: Text(
        title,
        textAlign: TextAlign.center,
        style: AppTypography.bodyLg.copyWith(fontWeight: FontWeight.w700),
      ),
      content: Text(
        content,
        textAlign: TextAlign.center,
        style: AppTypography.bodyMd.copyWith(color: AppColors.textMuted),
      ),
      actionsAlignment: MainAxisAlignment.spaceEvenly,
      actions: [
        TextButton(
          onPressed: () => Navigator.of(ctx).pop(false),
          child: Text(
            cancelText,
            style: AppTypography.bodyLg.copyWith(color: AppColors.textMuted),
          ),
        ),
        TextButton(
          onPressed: () => Navigator.of(ctx).pop(true),
          child: Text(
            confirmText,
            style: AppTypography.bodyLg.copyWith(
              color: destructive ? AppColors.tertiaryContainer : AppColors.primary,
            ),
          ),
        ),
      ],
    ),
  );
  return result ?? false;
}