"use client";

/**
 * FooterAggregateModal — 테이블 푸터 집계 설정 모달
 *
 * design-system.md Shell 패턴 적용.
 * 특정 열을 클릭하면 열리며, 해당 열의 집계 유형(합계/평균/개수/수식)을 설정.
 */

import React, { useState, useEffect, useCallback, useRef } from "react";
import { Dialog, DialogContent, DialogTitle, DialogDescription } from "@/components/ui/dialog";
import { Button } from "@/components/ui/button";
import { useUnsavedChangesGuard, UnsavedChangesDialog } from "@/components/common/UnsavedChangesGuard";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";
import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "@/components/ui/select";
import { Calculator, X } from "lucide-react";
import type { ComponentConfig } from "@/types/report";

type TableColumn = NonNullable<ComponentConfig["tableColumns"]>[number];

interface FooterAggregateModalProps {
  open: boolean;
  onOpenChange: (open: boolean) => void;
  column: TableColumn | null;
  columnIndex: number;
  onSave: (idx: number, updates: Partial<TableColumn>) => void;
}

export function FooterAggregateModal({ open, onOpenChange, column, columnIndex, onSave }: FooterAggregateModalProps) {
  const [summaryType, setSummaryType] = useState<"SUM" | "AVG" | "COUNT" | "NONE">("NONE");
  const [formula, setFormula] = useState("");
  const initialSnapshotRef = useRef<string>("");

  const hasChanges = useCallback(() => {
    const current = JSON.stringify({ summaryType, formula });
    return current !== initialSnapshotRef.current;
  }, [summaryType, formula]);

  const guard = useUnsavedChangesGuard({
    hasChanges,
    onClose: () => onOpenChange(false),
  });

  useEffect(() => {
    if (column) {
      const initType = column.summaryType || "NONE";
      const initFormula = column.formula || "";
      setSummaryType(initType);
      setFormula(initFormula);
      initialSnapshotRef.current = JSON.stringify({ summaryType: initType, formula: initFormula });
    }
  }, [column]);

  const handleSave = () => {
    onSave(columnIndex, {
      summaryType,
      formula: summaryType === "NONE" ? undefined : formula || undefined,
    });
    onOpenChange(false);
  };

  if (!column) return null;

  return (
    <>
      <Dialog open={open} onOpenChange={guard.handleOpenChange}>
        <DialogContent className="flex h-auto max-w-lg flex-col overflow-hidden p-0 [&>button]:hidden">
          <DialogTitle className="sr-only">계산 방식 설정</DialogTitle>
          <DialogDescription className="sr-only">
            {column.field || column.header} 열의 계산 방식을 설정합니다
          </DialogDescription>

          {/* Header */}
          <div className="border-border flex items-center justify-between border-b px-6 py-4">
            <div className="flex items-center gap-2">
              <Calculator className="h-4 w-4 text-blue-600" />
              <h2 className="text-foreground text-base font-semibold">계산 방식 설정</h2>
            </div>
            <Button variant="ghost" size="icon" onClick={guard.tryClose} className="h-8 w-8">
              <X className="h-4 w-4" />
            </Button>
          </div>

          {/* Content */}
          <div className="space-y-3 px-6 py-4">
            <p className="text-muted-foreground text-xs">
              <span className="font-mono font-medium text-blue-700">{column.field || column.header}</span> 열의 계산
              방식을 설정합니다.
            </p>

            <div className="space-y-2">
              <Label className="text-foreground text-xs font-medium">계산 방식 *</Label>
              <Select value={summaryType} onValueChange={(v) => setSummaryType(v as typeof summaryType)}>
                <SelectTrigger className="h-9 text-sm">
                  <SelectValue />
                </SelectTrigger>
                <SelectContent>
                  <SelectItem value="NONE">없음</SelectItem>
                  <SelectItem value="SUM">합계</SelectItem>
                  <SelectItem value="AVG">평균</SelectItem>
                  <SelectItem value="COUNT">개수</SelectItem>
                </SelectContent>
              </Select>
            </div>

            {summaryType !== "NONE" && (
              <div className="space-y-2">
                <Label className="text-foreground text-xs font-medium">계산식 (선택)</Label>
                <Input
                  value={formula}
                  onChange={(e) => setFormula(e.target.value)}
                  placeholder="예: {price} * {qty}"
                  className="h-9 font-mono text-sm"
                />
                <p className="text-muted-foreground text-[10px]">비워두면 기본 계산이 적용됩니다.</p>
              </div>
            )}
          </div>

          {/* Footer */}
          <div className="border-border flex items-center justify-end gap-2 border-t px-6 py-4">
            <Button variant="outline" onClick={guard.tryClose}>
              취소
            </Button>
            <Button className="bg-blue-600 hover:bg-blue-700" onClick={handleSave}>
              확인
            </Button>
          </div>
        </DialogContent>
      </Dialog>

      <UnsavedChangesDialog guard={guard} />
    </>
  );
}