import { useEffect, useRef, useState } from "react";
import { toast } from "sonner";
import CopyButton from "@/components/common/CopyButton";
import MessagePreview from "./MessagePreview";
import { fetchMessageInfo, deleteMessage } from "@/api/message.api";
import type { MessageInfoResponse } from "../types";

interface MessageSlidePanelProps {
  isOpen: boolean;
  onClose: () => void;
  messageCode: string | null;
  serviceCode: string | null;
}

export default function MessageSlidePanel({
  isOpen,
  onClose,
  messageCode,
  serviceCode,
}: MessageSlidePanelProps) {
  const [detail, setDetail] = useState<MessageInfoResponse | null>(null);
  const [loading, setLoading] = useState(false);
  const [showDeleteConfirm, setShowDeleteConfirm] = useState(false);
  const [deleting, setDeleting] = useState(false);
  const bodyRef = useRef<HTMLDivElement>(null);

  // 메시지 상세 조회
  useEffect(() => {
    if (!isOpen || !messageCode || !serviceCode) {
      setDetail(null);
      return;
    }
    (async () => {
      setLoading(true);
      try {
        const res = await fetchMessageInfo(
          { message_code: messageCode },
          serviceCode,
        );
        setDetail(res.data.data);
      } catch {
        setDetail(null);
        toast.error("메시지 상세 조회에 실패했습니다.");
      } finally {
        setLoading(false);
      }
    })();
  }, [isOpen, messageCode, serviceCode]);

  // 패널 열릴 때 스크롤 최상단으로 리셋
  useEffect(() => {
    if (isOpen) {
      bodyRef.current?.scrollTo(0, 0);
    }
  }, [isOpen, messageCode]);

  // ESC 닫기
  useEffect(() => {
    const handleKeyDown = (e: KeyboardEvent) => {
      if (e.key === "Escape" && isOpen) onClose();
    };
    document.addEventListener("keydown", handleKeyDown);
    return () => document.removeEventListener("keydown", handleKeyDown);
  }, [isOpen, onClose]);

  // 패널 열릴 때 body 스크롤 잠금
  useEffect(() => {
    if (isOpen) {
      document.body.style.overflow = "hidden";
    } else {
      document.body.style.overflow = "";
    }
    return () => {
      document.body.style.overflow = "";
    };
  }, [isOpen]);

  // 삭제 처리
  const handleDelete = async () => {
    if (!detail?.message_code || !serviceCode) return;
    setDeleting(true);
    try {
      await deleteMessage(
        { message_code: detail.message_code },
        serviceCode,
      );
      toast.success(`${detail.message_code} 메시지가 삭제되었습니다.`);
      setShowDeleteConfirm(false);
      onClose();
    } catch {
      toast.error("메시지 삭제에 실패했습니다.");
    } finally {
      setDeleting(false);
    }
  };

  // 기타 정보 문자열 변환
  const extraText =
    detail?.data != null
      ? typeof detail.data === "string"
        ? detail.data
        : JSON.stringify(detail.data, null, 2)
      : "";

  return (
    <>
      {/* 오버레이 */}
      <div
        className={`fixed inset-0 bg-black/30 z-50 transition-opacity duration-300 ${
          isOpen ? "opacity-100" : "opacity-0 pointer-events-none"
        }`}
        onClick={onClose}
      />

      {/* 패널 */}
      <aside
        className={`fixed top-0 right-0 h-full w-[480px] bg-white shadow-2xl z-50 flex flex-col transition-transform duration-300 ${
          isOpen ? "translate-x-0" : "translate-x-full"
        }`}
      >
        {/* 패널 헤더 */}
        <div className="flex items-center justify-between px-6 py-5 border-b border-gray-200">
          <h2 className="text-lg font-bold text-[#0f172a]">메시지 상세</h2>
          <button
            onClick={onClose}
            className="text-gray-400 hover:text-gray-600 transition-colors p-1 rounded-lg hover:bg-gray-100"
          >
            <span className="material-symbols-outlined text-xl">close</span>
          </button>
        </div>

        {/* 패널 본문 */}
        <div ref={bodyRef} className="flex-1 overflow-y-auto p-6">
          {loading ? (
            /* 로딩 스켈레톤 */
            <div className="space-y-5">
              {Array.from({ length: 6 }).map((_, i) => (
                <div key={i}>
                  <div className="h-3 w-16 rounded bg-gray-100 animate-pulse mb-2" />
                  <div className="h-9 w-full rounded bg-gray-100 animate-pulse" />
                </div>
              ))}
            </div>
          ) : detail ? (
            <div className="space-y-5">
              {/* 메시지 ID */}
              <div className="flex items-center gap-3">
                <label className="text-xs font-semibold text-gray-400 uppercase tracking-wider flex-shrink-0">
                  메시지 ID
                </label>
                <code className="text-sm font-medium text-[#2563EB] bg-[#2563EB]/5 px-2 py-0.5 rounded">
                  {detail.message_code}
                </code>
                <CopyButton text={detail.message_code ?? ""} />
              </div>

              <div className="h-px bg-gray-100" />

              {/* 서비스 선택 */}
              <div>
                <label className="block text-sm font-medium text-[#0f172a] mb-2">
                  서비스 선택
                </label>
                <p className="w-full px-4 py-2.5 bg-gray-50 border border-gray-200 rounded text-sm text-gray-700">
                  {detail.service_name}
                </p>
              </div>

              {/* 제목 */}
              <div>
                <label className="block text-sm font-medium text-[#0f172a] mb-2">
                  제목
                </label>
                <p className="w-full px-4 py-2.5 bg-gray-50 border border-gray-200 rounded text-sm text-gray-700">
                  {detail.title}
                </p>
              </div>

              {/* 내용 */}
              <div>
                <label className="block text-sm font-medium text-[#0f172a] mb-2">
                  내용
                </label>
                <div className="w-full px-4 py-2.5 bg-gray-50 border border-gray-200 rounded text-sm text-gray-700 leading-relaxed min-h-[120px]">
                  {detail.body}
                </div>
              </div>

              {/* 이미지 URL */}
              <div>
                <label className="block text-sm font-medium text-[#0f172a] mb-2">
                  이미지 URL
                </label>
                <p
                  className={`w-full px-4 py-2.5 bg-gray-50 border border-gray-200 rounded text-sm truncate ${
                    detail.image_url
                      ? "text-gray-500"
                      : "italic text-gray-400"
                  }`}
                >
                  {detail.image_url || "등록된 이미지 없음"}
                </p>
              </div>

              {/* 링크 URL */}
              <div>
                <div className="flex items-center gap-2 mb-2">
                  <label className="text-sm font-medium text-[#0f172a]">
                    링크 URL
                  </label>
                  <span
                    className={`text-[11px] font-medium px-1.5 py-0.5 rounded ${
                      detail.link_type === "deeplink"
                        ? "bg-purple-100 text-purple-700"
                        : "bg-blue-100 text-blue-700"
                    }`}
                  >
                    {detail.link_type === "deeplink" ? "딥링크" : "웹 링크"}
                  </span>
                </div>
                <p className="w-full px-4 py-2.5 bg-gray-50 border border-gray-200 rounded text-sm text-gray-500 truncate">
                  {detail.link_url || "—"}
                </p>
              </div>

              {/* 기타 정보 */}
              <div>
                <label className="block text-sm font-medium text-[#0f172a] mb-2">
                  기타 정보
                </label>
                <div className="w-full px-4 py-2.5 bg-gray-50 border border-gray-200 rounded text-sm text-gray-700 leading-relaxed min-h-[80px] whitespace-pre-line">
                  {extraText || "—"}
                </div>
              </div>

              <div className="h-px bg-gray-100" />

              {/* 프리뷰 */}
              <div>
                <label className="block text-sm font-medium text-[#0f172a] mb-3">
                  프리뷰
                </label>
                <MessagePreview
                  title={detail.title ?? ""}
                  body={detail.body ?? ""}
                  hasImage={!!detail.image_url}
                  appName={detail.service_name ?? ""}
                  variant="small"
                />
              </div>

              <div className="h-px bg-gray-100" />

              {/* 삭제 버튼 */}
              <button
                type="button"
                onClick={() => setShowDeleteConfirm(true)}
                className="w-full flex items-center justify-center border border-red-300 text-red-600 hover:bg-red-50 px-5 py-2.5 rounded text-sm font-medium transition"
              >
                삭제
              </button>
            </div>
          ) : (
            <div className="flex items-center justify-center h-full text-gray-400 text-sm">
              메시지를 선택해주세요
            </div>
          )}
        </div>
      </aside>

      {/* 삭제 확인 모달 */}
      {showDeleteConfirm && detail && (
        <div className="fixed inset-0 z-[60] flex items-center justify-center">
          <div
            className="absolute inset-0 bg-black/40"
            onClick={() => setShowDeleteConfirm(false)}
          />
          <div className="relative bg-white rounded-xl shadow-2xl max-w-md w-full mx-4 p-6 border border-gray-200">
            <div className="flex items-center gap-3 mb-4">
              <div className="size-10 rounded-full bg-red-100 flex items-center justify-center flex-shrink-0">
                <span className="material-symbols-outlined text-red-600 text-xl">
                  warning
                </span>
              </div>
              <h3 className="text-lg font-bold text-[#0f172a]">메시지 삭제</h3>
            </div>
            <p className="text-sm text-[#0f172a] mb-2">
              <strong>{detail.message_code}</strong> 메시지를 삭제하시겠습니까?
            </p>
            <div className="bg-red-50 border border-red-200 rounded-lg px-4 py-3 mb-5">
              <div className="flex items-center gap-1.5 text-red-700 text-xs font-medium">
                <span
                  className="material-symbols-outlined flex-shrink-0"
                  style={{ fontSize: "14px" }}
                >
                  info
                </span>
                <span>삭제 후 복구가 불가능합니다.</span>
              </div>
            </div>
            <div className="flex justify-end gap-3">
              <button
                onClick={() => setShowDeleteConfirm(false)}
                disabled={deleting}
                className="bg-white border border-gray-300 hover:bg-gray-50 text-[#0f172a] px-5 py-2.5 rounded text-sm font-medium transition"
              >
                취소
              </button>
              <button
                onClick={handleDelete}
                disabled={deleting}
                className="bg-red-600 hover:bg-red-700 text-white px-5 py-2.5 rounded text-sm font-medium transition shadow-sm flex items-center gap-2 disabled:opacity-50"
              >
                <span className="material-symbols-outlined text-base">
                  delete
                </span>
                <span>{deleting ? "삭제 중..." : "삭제"}</span>
              </button>
            </div>
          </div>
        </div>
      )}
    </>
  );
}