/**
 * Global toast helper backed by native UI.
 *
 * Usage:
 * import { Toast } from '@/utils/toast.utils';
 *
 * Toast.success('操作成功！');
 * Toast.error('操作失败！');
 * Toast.warning('注意！');
 */

import { NativeModules, Platform, ToastAndroid } from 'react-native';

export type ToastType = 'default' | 'success' | 'error' | 'warning' | 'info';

export interface ToastConfig {
  message?: string;
  text1?: string;
  duration?: number;
  type?: ToastType;
  backgroundColor?: string;
  textColor?: string;
  icon?: string;
}

type NativeToastModule = {
  show: (options: {
    message?: string;
    text1?: string;
    duration?: number;
    type?: ToastType;
    backgroundColor?: string;
    textColor?: string;
    icon?: string;
  }) => void;
};

const DEFAULT_DURATION = 2000;
const MIN_DURATION = 1000;
const MAX_DURATION = 10000;

// 增强类型安全性：添加运行时检查确保模块存在且具有预期的方法
const nativeToast = NativeModules.NativeToastManager &&
  typeof NativeModules.NativeToastManager.show === 'function'
  ? NativeModules.NativeToastManager as NativeToastModule
  : undefined;

const clampDuration = (duration?: number) => {
  const value = typeof duration === 'number' ? duration : DEFAULT_DURATION;
  return Math.min(Math.max(value, MIN_DURATION), MAX_DURATION);
};

const resolveMessage = (config: ToastConfig) => {
  const raw = (config.message ?? config.text1 ?? '').toString();
  return raw.trim();
};

const showOnAndroid = (message: string, duration: number) => {
  const toastDuration = duration >= 3000 ? ToastAndroid.LONG : ToastAndroid.SHORT;
  ToastAndroid.showWithGravity(message, toastDuration, ToastAndroid.CENTER);
};

const showNative = (config: ToastConfig) => {
  const message = resolveMessage(config);

  if (!message) {
    console.warn('Toast invoked without message content');
    return;
  }

  const duration = clampDuration(config.duration);
  const type = config.type ?? 'default';

  if (Platform.OS === 'android') {
    showOnAndroid(message, duration);
    return;
  }

  if (nativeToast?.show) {
    nativeToast.show({
      ...config,
      message,
      duration,
      type,
    });
    return;
  }

  // 为不支持的平台提供更明显的用户反馈
  if (Platform.OS === 'web') {
    // 在 Web 环境下使用 console.warn 并尝试使用浏览器原生 alert
    console.warn(`Toast: ${message}`);
    try {
      // 仅在重要消息时使用 alert，避免过度打扰用户
      if (config.type === 'error' || config.type === 'warning') {
        alert(message);
      }
    } catch (e) {
      // 忽略 alert 错误
    }
  } else {
    console.log(`Toast: ${message}`);
  }
};

export const Toast = {
  show: (config: ToastConfig) => {
    showNative(config);
  },
  success: (message: string, duration?: number) => {
    showNative({ message, duration, type: 'success' });
  },
  error: (message: string, duration?: number) => {
    showNative({ message, duration, type: 'error' });
  },
  warning: (message: string, duration?: number) => {
    showNative({ message, duration, type: 'warning' });
  },
  info: (message: string, duration?: number) => {
    showNative({ message, duration, type: 'info' });
  },
};