"use client";

import { useEffect, useState } from "react";
import { X, AlertCircle, CheckCircle2 } from "lucide-react";
import type { ToastDetail } from "@/lib/toast";

export default function Toaster() {
  const [items, setItems] = useState<ToastDetail[]>([]);

  useEffect(() => {
    const handler = (e: Event) => {
      const detail = (e as CustomEvent<ToastDetail>).detail;
      setItems((list) => [...list.slice(-2), detail]);
      window.setTimeout(() => {
        setItems((list) => list.filter((t) => t.id !== detail.id));
      }, 3600);
    };
    window.addEventListener("j13-toast", handler);
    return () => window.removeEventListener("j13-toast", handler);
  }, []);

  const dismiss = (id: number) => setItems((list) => list.filter((t) => t.id !== id));

  return (
    <div
      className="fixed bottom-5 right-4 sm:right-6 z-[10000] flex flex-col gap-2 w-[calc(100vw-2rem)] sm:w-80"
      aria-live="polite"
      role="status"
    >
      {items.map((t) => (
        <ToastCard key={t.id} toast={t} onClose={() => dismiss(t.id)} />
      ))}
    </div>
  );
}

function ToastCard({ toast, onClose }: { toast: ToastDetail; onClose: () => void }) {
  const color = toast.variant === "error" ? "var(--danger)" : "var(--ok)";
  return (
    <div
      className="j13-toast-in flex items-start gap-3 px-4 py-3.5"
      style={{
        background: "var(--panel)",
        border: "1px solid var(--line)",
        borderLeft: `3px solid ${color}`,
        borderRadius: "var(--r-sm)",
        boxShadow: "var(--shadow-lg)",
      }}
      role="alert"
    >
      <span className="shrink-0 mt-0.5" style={{ color }}>
        {toast.variant === "error" ? <AlertCircle size={16} /> : <CheckCircle2 size={16} />}
      </span>
      <p className="flex-1 text-[13.5px] leading-snug" style={{ color: "var(--ink)" }}>
        {toast.message}
      </p>
      <button
        onClick={onClose}
        className="shrink-0 meta hover:text-[var(--ink)] transition-colors"
        aria-label="关闭提示"
      >
        <X size={14} />
      </button>
    </div>
  );
}