"use client";

import React, { createContext, useContext, useEffect, useRef, useState } from "react";
import { SendMessageForm } from "@/app/components/SendMessageForm";

type MessageTarget = { receiverId: string; receiverNickname?: string | null } | null;
type Ctx = { openMessageModal: (target: { receiverId: string; receiverNickname?: string | null }) => void };

const MessageModalCtx = createContext<Ctx>({ openMessageModal: () => {} });

export function useMessageModal() {
  return useContext(MessageModalCtx);
}

export function MessageModalProvider({ children }: { children: React.ReactNode }) {
  const [target, setTarget] = useState<MessageTarget>(null);
  const dialogRef = useRef<HTMLDivElement>(null);

  const openMessageModal = (t: { receiverId: string; receiverNickname?: string | null }) => {
    setTarget({ receiverId: t.receiverId, receiverNickname: t.receiverNickname ?? null });
  };

  const close = () => setTarget(null);

  useEffect(() => {
    function onKey(e: KeyboardEvent) {
      if (e.key === "Escape") close();
    }
    document.addEventListener("keydown", onKey);
    return () => document.removeEventListener("keydown", onKey);
  }, []);

  return (
    <MessageModalCtx.Provider value={{ openMessageModal }}>
      {children}
      {target && (
        <div
          className="fixed inset-0 z-[1000] flex items-center justify-center"
          role="dialog"
          aria-modal="true"
        >
          <div
            className="absolute inset-0 bg-black/40"
            onClick={close}
            aria-hidden
          />
          <div
            ref={dialogRef}
            className="relative z-[1001] w-[92%] max-w-[520px] rounded-lg bg-white shadow-xl border border-neutral-200"
          >
            <div className="px-5 py-3 border-b border-neutral-200 flex items-center justify-between">
              <h3 className="text-base font-semibold text-neutral-900">쪽지 보내기</h3>
              <button
                onClick={close}
                className="h-8 w-8 inline-flex items-center justify-center rounded-md hover:bg-neutral-100 cursor-pointer"
                aria-label="닫기"
              >
                ×
              </button>
            </div>
            <div className="p-5">
              <SendMessageForm receiverId={target.receiverId} receiverNickname={target.receiverNickname} onSent={close} />
            </div>
            <div className="px-5 pb-4 flex items-center justify-end">
              <button
                onClick={close}
                className="h-9 px-4 rounded-md border border-neutral-300 bg-white text-sm hover:bg-neutral-100 cursor-pointer"
              >
                닫기
              </button>
            </div>
          </div>
        </div>
      )}
    </MessageModalCtx.Provider>
  );
}