import { useCallback, useState } from "react";
import type { ToastMessage } from "./types.js";

/**
 * useToast - 全局 Toast 通知管理
 *
 * 用途：成功/错误/警告/信息提示，自动关闭。
 * 与 Zustand ui-store 解耦，提供 hook 层 API。
 *
 * @example
 * const { toasts, showToast, dismissToast } = useToast();
 * showToast({ type: "success", title: "保存成功" });
 */

export interface UseToastReturn {
  /** 当前活跃的 toast 列表 */
  toasts: ToastMessage[];
  /** 展示 toast */
  showToast: (toast: Omit<ToastMessage, "id">) => string;
  /** 关闭指定 toast */
  dismissToast: (id: string) => void;
  /** 关闭全部 toast */
  dismissAll: () => void;
}

export function useToast(): UseToastReturn {
  const [toasts, setToasts] = useState<ToastMessage[]>([]);

  const dismissToast = useCallback((id: string): void => {
    setToasts((prev) => prev.filter((t) => t.id !== id));
  }, []);

  const showToast = useCallback(
    (toast: Omit<ToastMessage, "id">): string => {
      const id = `toast-${Date.now()}-${Math.random().toString(36).slice(2, 8)}`;
      const fullToast: ToastMessage = {
        id,
        duration: 4000,
        ...toast,
      };

      setToasts((prev) => [...prev, fullToast]);

      // 自动关闭
      if (fullToast.duration && fullToast.duration > 0) {
        setTimeout(() => {
          dismissToast(id);
        }, fullToast.duration);
      }

      return id;
    },
    [dismissToast],
  );

  const dismissAll = useCallback((): void => {
    setToasts([]);
  }, []);

  return {
    toasts,
    showToast,
    dismissToast,
    dismissAll,
  };
}