"use client";

/**
 * SettingsModalShell.tsx — 컴포넌트 설정 모달 공통 Shell
 *
 * [역할]
 * 모든 컴포넌트 설정 모달이 동일한 형식을 유지하도록 하는 재사용 모듈.
 * 파란색 그라데이션 헤더 + 탭(헤더 하단 인라인) + 스크롤 콘텐츠 + 하단 Footer 구조.
 */

import React, { useState, useCallback, useEffect, useRef } from "react";
import { Dialog, DialogContent, DialogTitle, DialogDescription } from "@/components/ui/dialog";
import { Button } from "@/components/ui/button";
import { X, Save, AlertTriangle, CheckCircle } from "lucide-react";

const DND_ROOT_ID = "report-designer-dnd-root";

export interface ModalTabDef {
  key: string;
  icon: React.ReactNode;
  label: string;
}

export interface ModalAlert {
  type: "success" | "warning";
  message: string;
}

interface SettingsModalShellProps {
  open: boolean;
  onOpenChange: (open: boolean) => void;
  title: string;
  icon?: React.ReactNode;
  tabs: ModalTabDef[];
  activeTab: string;
  onTabChange: (key: string) => void;
  onSave: () => void;
  onClose: () => void;
  alert?: ModalAlert | null;
  children: React.ReactNode;
  maxWidth?: string;
  saveLabel?: string;
}

export function SettingsModalShell({
  open,
  onOpenChange,
  title,
  icon,
  tabs,
  activeTab,
  onTabChange,
  onSave,
  onClose,
  alert,
  children,
  maxWidth = "max-w-4xl",
  saveLabel = "저장",
}: SettingsModalShellProps) {
  const [dndContainer, setDndContainer] = useState<HTMLElement | undefined>(undefined);
  useEffect(() => {
    if (open) {
      const el = document.getElementById(DND_ROOT_ID);
      setDndContainer(el ?? undefined);
    }
  }, [open]);

  return (
    <Dialog open={open} onOpenChange={onOpenChange}>
      <DialogContent
        container={dndContainer}
        className={`flex h-[92vh] ${maxWidth} flex-col gap-0 overflow-hidden rounded-xl p-0 [&>button]:hidden`}
      >
        <DialogTitle className="sr-only">{title}</DialogTitle>
        <DialogDescription className="sr-only">{title} 설정 모달</DialogDescription>

        {/* Gradient Header */}
        <div className="shrink-0 rounded-t-xl bg-linear-to-r from-blue-600 to-indigo-600">
          {/* Title row */}
          <div className="flex items-center gap-3 px-6 pt-4 pb-3">
            {icon && <span className="shrink-0 text-white/90">{icon}</span>}
            <h2 className="min-w-0 flex-1 truncate text-sm font-semibold text-white">
              {title}
            </h2>
            <button
              className="ml-auto shrink-0 rounded-md p-1.5 text-white/80 transition-colors hover:bg-white/20 hover:text-white"
              onClick={onClose}
            >
              <X className="h-4 w-4" />
              <span className="sr-only">닫기</span>
            </button>
          </div>

          {/* Tabs row */}
          {tabs.length > 0 && (
            <div className="flex items-end gap-1 px-6 pb-0">
              {tabs.map((tab) => (
                <button
                  key={tab.key}
                  onClick={() => onTabChange(tab.key)}
                  className={`flex items-center gap-1.5 rounded-t-lg px-4 py-2 text-xs font-medium transition-all ${
                    activeTab === tab.key
                      ? "bg-white text-blue-700 shadow-sm"
                      : "text-white/80 hover:bg-white/15 hover:text-white"
                  }`}
                >
                  {tab.icon && <span className="shrink-0">{tab.icon}</span>}
                  {tab.label}
                </button>
              ))}
            </div>
          )}
        </div>

        {/* 토스트 알림 */}
        {alert && (
          <div className="pointer-events-none absolute right-4 top-2 z-50 animate-in fade-in slide-in-from-top-2 duration-200">
            <div
              className={`pointer-events-auto flex items-start gap-3 rounded-lg border bg-white px-4 py-3 shadow-lg ${
                alert.type === "success" ? "border-gray-200" : "border-amber-200"
              }`}
            >
              {alert.type === "success" ? (
                <div className="mt-0.5 flex h-5 w-5 shrink-0 items-center justify-center rounded-full bg-emerald-500">
                  <CheckCircle className="h-3.5 w-3.5 text-white" />
                </div>
              ) : (
                <div className="mt-0.5 flex h-5 w-5 shrink-0 items-center justify-center rounded-full bg-amber-500">
                  <AlertTriangle className="h-3.5 w-3.5 text-white" />
                </div>
              )}
              <div className="flex flex-col">
                <span className="text-sm font-semibold text-gray-900">
                  {alert.type === "success" ? "성공" : "알림"}
                </span>
                <span className="text-sm text-gray-500">{alert.message}</span>
              </div>
            </div>
          </div>
        )}

        {/* Content Area */}
        <div className="min-h-0 flex-1 overflow-y-auto bg-gray-50">
          {children}
        </div>

        {/* Footer */}
        <div className="shrink-0 rounded-b-xl border-t bg-white px-6 py-3 flex items-center justify-end gap-2">
          <Button
            size="sm"
            onClick={onSave}
            className="h-8 px-4 text-xs bg-blue-600 hover:bg-blue-700 text-white border-blue-600"
          >
            <Save className="h-3.5 w-3.5" />
            {saveLabel}
          </Button>
          <Button
            variant="outline"
            size="sm"
            onClick={onClose}
            className="h-8 px-4 text-xs"
          >
            취소
          </Button>
        </div>
      </DialogContent>
    </Dialog>
  );
}

// ─── 토스트 알림 훅 ──────────────────────────────────────────────────────────

export function useModalAlert() {
  const [alert, setAlert] = useState<ModalAlert | null>(null);
  const timerRef = useRef<ReturnType<typeof setTimeout> | null>(null);

  useEffect(() => {
    return () => {
      if (timerRef.current) clearTimeout(timerRef.current);
    };
  }, []);

  const showAlert = useCallback((type: ModalAlert["type"], message: string) => {
    if (timerRef.current) clearTimeout(timerRef.current);
    setAlert({ type, message });
    timerRef.current = setTimeout(() => setAlert(null), 3000);
  }, []);

  const clearAlert = useCallback(() => setAlert(null), []);

  return { alert, showAlert, clearAlert };
}