"use client";

import React, { useState, useCallback, useMemo, useEffect } from "react";
import { Plus, X, Save, FolderOpen, RefreshCw, Eye, AlertCircle } from "lucide-react";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
import {
  Dialog,
  DialogContent,
  DialogHeader,
  DialogTitle,
  DialogFooter,
} from "@/components/ui/dialog";
import {
  Table,
  TableBody,
  TableCell,
  TableHead,
  TableHeader,
  TableRow,
} from "@/components/ui/table";
import { ScrollArea } from "@/components/ui/scroll-area";
import { Alert, AlertDescription } from "@/components/ui/alert";
import { cn } from "@/lib/utils";
import {
  RackStructureComponentProps,
  RackLineCondition,
  RackStructureTemplate,
  GeneratedLocation,
  RackStructureContext,
} from "./types";

// 고유 ID 생성
const generateId = () => `cond_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`;

// 조건 카드 컴포넌트
interface ConditionCardProps {
  condition: RackLineCondition;
  index: number;
  onUpdate: (id: string, updates: Partial<RackLineCondition>) => void;
  onRemove: (id: string) => void;
  maxRows: number;
  maxLevels: number;
  readonly?: boolean;
}

const ConditionCard: React.FC<ConditionCardProps> = ({
  condition,
  index,
  onUpdate,
  onRemove,
  maxRows,
  maxLevels,
  readonly,
}) => {
  // 로컬 상태로 입력값 관리
  const [localValues, setLocalValues] = useState({
    startRow: condition.startRow.toString(),
    endRow: condition.endRow.toString(),
    levels: condition.levels.toString(),
  });

  // condition이 변경되면 로컬 상태 동기화
  useEffect(() => {
    setLocalValues({
      startRow: condition.startRow.toString(),
      endRow: condition.endRow.toString(),
      levels: condition.levels.toString(),
    });
  }, [condition.startRow, condition.endRow, condition.levels]);

  // 계산된 위치 수
  const locationCount = useMemo(() => {
    const start = parseInt(localValues.startRow) || 0;
    const end = parseInt(localValues.endRow) || 0;
    const levels = parseInt(localValues.levels) || 0;
    if (start > 0 && end >= start && levels > 0) {
      return (end - start + 1) * levels;
    }
    return 0;
  }, [localValues]);

  // 입력값 변경 핸들러
  const handleChange = (field: keyof typeof localValues, value: string) => {
    setLocalValues((prev) => ({ ...prev, [field]: value }));
  };

  // blur 시 실제 업데이트
  const handleBlur = (field: keyof typeof localValues) => {
    const numValue = parseInt(localValues[field]) || 0;
    const clampedValue = Math.max(0, Math.min(numValue, field === "levels" ? maxLevels : maxRows));
    
    setLocalValues((prev) => ({ ...prev, [field]: clampedValue.toString() }));
    
    const updateField = field === "startRow" ? "startRow" : field === "endRow" ? "endRow" : "levels";
    onUpdate(condition.id, { [updateField]: clampedValue });
  };

  return (
    <div className="relative rounded-lg border border-gray-200 bg-white shadow-sm">
      {/* 헤더 */}
      <div className="flex items-center justify-between rounded-t-lg bg-blue-600 px-4 py-2 text-white">
        <span className="font-medium">조건 {index + 1}</span>
        {!readonly && (
          <button
            onClick={() => onRemove(condition.id)}
            className="rounded p-1 transition-colors hover:bg-blue-700"
          >
            <X className="h-4 w-4" />
          </button>
        )}
      </div>

      {/* 내용 */}
      <div className="space-y-4 p-4">
        {/* 열 범위 */}
        <div className="flex items-center gap-2">
          <div className="flex-1">
            <label className="mb-1 block text-xs font-medium text-gray-700">
              열 범위 <span className="text-red-500">*</span>
            </label>
            <div className="flex items-center gap-2">
              <Input
                type="number"
                min={1}
                max={maxRows}
                value={localValues.startRow}
                onChange={(e) => handleChange("startRow", e.target.value)}
                onBlur={() => handleBlur("startRow")}
                disabled={readonly}
                className="h-9 text-center"
              />
              <span className="text-gray-500">~</span>
              <Input
                type="number"
                min={1}
                max={maxRows}
                value={localValues.endRow}
                onChange={(e) => handleChange("endRow", e.target.value)}
                onBlur={() => handleBlur("endRow")}
                disabled={readonly}
                className="h-9 text-center"
              />
            </div>
          </div>
          <div className="w-20">
            <label className="mb-1 block text-xs font-medium text-gray-700">
              단 수 <span className="text-red-500">*</span>
            </label>
            <Input
              type="number"
              min={1}
              max={maxLevels}
              value={localValues.levels}
              onChange={(e) => handleChange("levels", e.target.value)}
              onBlur={() => handleBlur("levels")}
              disabled={readonly}
              className="h-9 text-center"
            />
          </div>
        </div>

        {/* 계산 결과 */}
        <div className="rounded-md bg-blue-50 px-3 py-2 text-center text-sm text-blue-700">
          {locationCount > 0 ? (
            <>
              {localValues.startRow}열 ~ {localValues.endRow}열 x {localValues.levels}단 ={" "}
              <strong>{locationCount}개</strong>
            </>
          ) : (
            <span className="text-gray-500">값을 입력하세요</span>
          )}
        </div>
      </div>
    </div>
  );
};

// 메인 컴포넌트
export const RackStructureComponent: React.FC<RackStructureComponentProps> = ({
  config,
  context: propContext,
  formData,
  onChange,
  onConditionsChange,
  isPreview = false,
}) => {
  // 조건 목록
  const [conditions, setConditions] = useState<RackLineCondition[]>(
    config.initialConditions || []
  );
  
  // 템플릿 관련 상태
  const [templates, setTemplates] = useState<RackStructureTemplate[]>([]);
  const [isTemplateDialogOpen, setIsTemplateDialogOpen] = useState(false);
  const [templateName, setTemplateName] = useState("");
  const [isSaveMode, setIsSaveMode] = useState(false);
  
  // 미리보기 데이터
  const [previewData, setPreviewData] = useState<GeneratedLocation[]>([]);
  const [isPreviewGenerated, setIsPreviewGenerated] = useState(false);

  // 설정값
  const maxConditions = config.maxConditions || 10;
  const maxRows = config.maxRows || 99;
  const maxLevels = config.maxLevels || 20;
  const readonly = config.readonly || isPreview;
  const fieldMapping = config.fieldMapping || {};

  // 필드 매핑을 통해 formData에서 컨텍스트 추출
  const context: RackStructureContext = useMemo(() => {
    // propContext가 있으면 우선 사용
    if (propContext) return propContext;
    
    // formData와 fieldMapping을 사용하여 컨텍스트 생성
    if (!formData) return {};

    return {
      warehouseCode: fieldMapping.warehouseCodeField 
        ? formData[fieldMapping.warehouseCodeField] 
        : undefined,
      warehouseName: fieldMapping.warehouseNameField 
        ? formData[fieldMapping.warehouseNameField] 
        : undefined,
      floor: fieldMapping.floorField 
        ? formData[fieldMapping.floorField]?.toString() 
        : undefined,
      zone: fieldMapping.zoneField 
        ? formData[fieldMapping.zoneField] 
        : undefined,
      locationType: fieldMapping.locationTypeField 
        ? formData[fieldMapping.locationTypeField] 
        : undefined,
      status: fieldMapping.statusField 
        ? formData[fieldMapping.statusField] 
        : undefined,
    };
  }, [propContext, formData, fieldMapping]);

  // 필수 필드 검증
  const missingFields = useMemo(() => {
    const missing: string[] = [];
    if (!context.warehouseCode) missing.push("창고 코드");
    if (!context.floor) missing.push("층");
    if (!context.zone) missing.push("구역");
    return missing;
  }, [context]);

  // 조건 변경 시 콜백 호출
  useEffect(() => {
    onConditionsChange?.(conditions);
    setIsPreviewGenerated(false); // 조건 변경 시 미리보기 초기화
  }, [conditions, onConditionsChange]);

  // 조건 추가
  const addCondition = useCallback(() => {
    if (conditions.length >= maxConditions) return;
    
    // 마지막 조건의 다음 열부터 시작
    const lastCondition = conditions[conditions.length - 1];
    const startRow = lastCondition ? lastCondition.endRow + 1 : 1;
    
    const newCondition: RackLineCondition = {
      id: generateId(),
      startRow,
      endRow: startRow + 2,
      levels: 3,
    };
    
    setConditions((prev) => [...prev, newCondition]);
  }, [conditions, maxConditions]);

  // 조건 업데이트
  const updateCondition = useCallback((id: string, updates: Partial<RackLineCondition>) => {
    setConditions((prev) =>
      prev.map((cond) => (cond.id === id ? { ...cond, ...updates } : cond))
    );
  }, []);

  // 조건 삭제
  const removeCondition = useCallback((id: string) => {
    setConditions((prev) => prev.filter((cond) => cond.id !== id));
  }, []);

  // 통계 계산
  const statistics = useMemo(() => {
    let totalLocations = 0;
    let totalRows = 0;
    let maxLevel = 0;
    const rowSet = new Set<number>();

    conditions.forEach((cond) => {
      if (cond.startRow > 0 && cond.endRow >= cond.startRow && cond.levels > 0) {
        const rowCount = cond.endRow - cond.startRow + 1;
        totalLocations += rowCount * cond.levels;
        for (let r = cond.startRow; r <= cond.endRow; r++) {
          rowSet.add(r);
        }
        maxLevel = Math.max(maxLevel, cond.levels);
      }
    });

    totalRows = rowSet.size;
    return { totalLocations, totalRows, maxLevel };
  }, [conditions]);

  // 위치 코드 생성
  const generateLocationCode = useCallback(
    (row: number, level: number): { code: string; name: string } => {
      const warehouseCode = context?.warehouseCode || "WH001";
      const floor = context?.floor || "1";
      const zone = context?.zone || "A";

      // 코드 생성 (예: WH001-1A-01-1)
      const code = `${warehouseCode}-${floor}${zone}-${row.toString().padStart(2, "0")}-${level}`;
      
      // 이름 생성 (예: A구역-01열-1단)
      const name = `${zone}구역-${row.toString().padStart(2, "0")}열-${level}단`;

      return { code, name };
    },
    [context]
  );

  // 미리보기 생성
  const generatePreview = useCallback(() => {
    // 필수 필드 검증
    if (missingFields.length > 0) {
      alert(`다음 필드를 먼저 입력해주세요: ${missingFields.join(", ")}`);
      return;
    }

    const locations: GeneratedLocation[] = [];

    conditions.forEach((cond) => {
      if (cond.startRow > 0 && cond.endRow >= cond.startRow && cond.levels > 0) {
        for (let row = cond.startRow; row <= cond.endRow; row++) {
          for (let level = 1; level <= cond.levels; level++) {
            const { code, name } = generateLocationCode(row, level);
            locations.push({
              rowNum: row,
              levelNum: level,
              locationCode: code,
              locationName: name,
              locationType: context?.locationType || "선반",
              status: context?.status || "사용",
              // 추가 필드
              warehouseCode: context?.warehouseCode,
              floor: context?.floor,
              zone: context?.zone,
            });
          }
        }
      }
    });

    // 정렬: 열 -> 단 순서
    locations.sort((a, b) => {
      if (a.rowNum !== b.rowNum) return a.rowNum - b.rowNum;
      return a.levelNum - b.levelNum;
    });

    setPreviewData(locations);
    setIsPreviewGenerated(true);
    onChange?.(locations);
  }, [conditions, context, generateLocationCode, onChange, missingFields]);

  // 템플릿 저장
  const saveTemplate = useCallback(() => {
    if (!templateName.trim()) return;

    const newTemplate: RackStructureTemplate = {
      id: generateId(),
      name: templateName.trim(),
      conditions: [...conditions],
      createdAt: new Date().toISOString(),
    };

    setTemplates((prev) => [...prev, newTemplate]);
    setTemplateName("");
    setIsTemplateDialogOpen(false);
  }, [templateName, conditions]);

  // 템플릿 불러오기
  const loadTemplate = useCallback((template: RackStructureTemplate) => {
    setConditions(template.conditions.map((c) => ({ ...c, id: generateId() })));
    setIsTemplateDialogOpen(false);
  }, []);

  // 템플릿 삭제
  const deleteTemplate = useCallback((templateId: string) => {
    setTemplates((prev) => prev.filter((t) => t.id !== templateId));
  }, []);

  return (
    <div className="flex h-full flex-col gap-6">
      {/* 렉 라인 구조 설정 섹션 */}
      <Card>
        <CardHeader className="flex flex-row items-center justify-between pb-2">
          <CardTitle className="flex items-center gap-2 text-base">
            <div className="h-4 w-1 rounded bg-gradient-to-b from-green-500 to-blue-500" />
            렉 라인 구조 설정
          </CardTitle>
          {!readonly && (
            <div className="flex items-center gap-2">
              {config.showTemplates && (
                <>
                  <Button
                    variant="outline"
                    size="sm"
                    onClick={() => {
                      setIsSaveMode(false);
                      setIsTemplateDialogOpen(true);
                    }}
                    className="h-8 gap-1"
                  >
                    <FolderOpen className="h-4 w-4" />
                    템플릿
                  </Button>
                </>
              )}
              <Button
                variant="outline"
                size="sm"
                onClick={addCondition}
                disabled={conditions.length >= maxConditions}
                className="h-8 gap-1"
              >
                <Plus className="h-4 w-4" />
                조건 추가
              </Button>
            </div>
          )}
        </CardHeader>
        <CardContent>
          {/* 필수 필드 경고 */}
          {missingFields.length > 0 && (
            <Alert variant="destructive" className="mb-4">
              <AlertCircle className="h-4 w-4" />
              <AlertDescription>
                다음 필드를 먼저 입력해주세요: <strong>{missingFields.join(", ")}</strong>
                <br />
                <span className="text-xs">
                  (설정 패널에서 필드 매핑을 확인하세요)
                </span>
              </AlertDescription>
            </Alert>
          )}

          {/* 현재 매핑된 값 표시 */}
          {(context.warehouseCode || context.warehouseName || context.floor || context.zone) && (
            <div className="mb-4 flex flex-wrap gap-2 rounded-lg bg-gray-50 p-3">
              {(context.warehouseCode || context.warehouseName) && (
                <span className="rounded bg-blue-100 px-2 py-1 text-xs text-blue-800">
                  창고: {context.warehouseName || context.warehouseCode}
                  {context.warehouseName && context.warehouseCode && ` (${context.warehouseCode})`}
                </span>
              )}
              {context.floor && (
                <span className="rounded bg-green-100 px-2 py-1 text-xs text-green-800">
                  층: {context.floor}
                </span>
              )}
              {context.zone && (
                <span className="rounded bg-purple-100 px-2 py-1 text-xs text-purple-800">
                  구역: {context.zone}
                </span>
              )}
              {context.locationType && (
                <span className="rounded bg-orange-100 px-2 py-1 text-xs text-orange-800">
                  유형: {context.locationType}
                </span>
              )}
              {context.status && (
                <span className="rounded bg-gray-200 px-2 py-1 text-xs text-gray-800">
                  상태: {context.status}
                </span>
              )}
            </div>
          )}

          {/* 안내 메시지 */}
          <div className="mb-4 rounded-lg bg-blue-50 p-4">
            <ol className="space-y-1 text-sm text-blue-800">
              <li className="flex items-start gap-2">
                <span className="flex h-5 w-5 shrink-0 items-center justify-center rounded bg-blue-600 text-xs font-bold text-white">
                  1
                </span>
                조건 추가 버튼을 클릭하여 렉 라인 조건을 생성하세요
              </li>
              <li className="flex items-start gap-2">
                <span className="flex h-5 w-5 shrink-0 items-center justify-center rounded bg-blue-600 text-xs font-bold text-white">
                  2
                </span>
                각 조건마다 열 범위와 단 수를 입력하세요
              </li>
              <li className="flex items-start gap-2">
                <span className="flex h-5 w-5 shrink-0 items-center justify-center rounded bg-blue-600 text-xs font-bold text-white">
                  3
                </span>
                예시: 조건1(1~3열, 3단), 조건2(4~6열, 5단)
              </li>
            </ol>
          </div>

          {/* 조건 목록 또는 빈 상태 */}
          {conditions.length === 0 ? (
            <div className="flex flex-col items-center justify-center rounded-lg border-2 border-dashed border-gray-200 py-12">
              <div className="mb-4 text-6xl text-gray-300">📦</div>
              <p className="mb-4 text-gray-500">조건을 추가하여 렉 구조를 설정하세요</p>
              {!readonly && (
                <Button onClick={addCondition} className="gap-1">
                  <Plus className="h-4 w-4" />
                  첫 번째 조건 추가
                </Button>
              )}
            </div>
          ) : (
            <div className="flex flex-wrap gap-4">
              {conditions.map((condition, index) => (
                <div key={condition.id} className="w-[280px]">
                  <ConditionCard
                    condition={condition}
                    index={index}
                    onUpdate={updateCondition}
                    onRemove={removeCondition}
                    maxRows={maxRows}
                    maxLevels={maxLevels}
                    readonly={readonly}
                  />
                </div>
              ))}
            </div>
          )}
        </CardContent>
      </Card>

      {/* 등록 미리보기 섹션 */}
      {config.showPreview && conditions.length > 0 && (
        <Card>
          <CardHeader className="flex flex-row items-center justify-between pb-2">
            <CardTitle className="flex items-center gap-2 text-base">
              <Eye className="h-4 w-4 text-amber-600" />
              등록 미리보기
            </CardTitle>
            <Button
              variant="outline"
              size="sm"
              onClick={generatePreview}
              className="h-8 gap-1"
            >
              <RefreshCw className="h-4 w-4" />
              미리보기 생성
            </Button>
          </CardHeader>
          <CardContent>
            {/* 통계 카드 */}
            {config.showStatistics && (
              <div className="mb-4 grid grid-cols-3 gap-4">
                <div className="rounded-lg border bg-white p-4 text-center">
                  <div className="text-sm text-gray-500">총 위치</div>
                  <div className="text-2xl font-bold">{statistics.totalLocations}개</div>
                </div>
                <div className="rounded-lg border bg-white p-4 text-center">
                  <div className="text-sm text-gray-500">열 수</div>
                  <div className="text-2xl font-bold">{statistics.totalRows}개</div>
                </div>
                <div className="rounded-lg border bg-white p-4 text-center">
                  <div className="text-sm text-gray-500">최대 단</div>
                  <div className="text-2xl font-bold">{statistics.maxLevel}단</div>
                </div>
              </div>
            )}

            {/* 미리보기 테이블 */}
            {isPreviewGenerated && previewData.length > 0 ? (
              <div className="rounded-lg border">
                <ScrollArea className="h-[400px]">
                  <Table>
                    <TableHeader className="sticky top-0 bg-gray-50">
                      <TableRow>
                        <TableHead className="w-12 text-center">No</TableHead>
                        <TableHead>위치코드</TableHead>
                        <TableHead>위치명</TableHead>
                        <TableHead className="w-16 text-center">층</TableHead>
                        <TableHead className="w-16 text-center">구역</TableHead>
                        <TableHead className="w-16 text-center">열</TableHead>
                        <TableHead className="w-16 text-center">단</TableHead>
                        <TableHead className="w-20 text-center">유형</TableHead>
                        <TableHead className="w-20 text-center">비고</TableHead>
                      </TableRow>
                    </TableHeader>
                    <TableBody>
                      {previewData.map((loc, idx) => (
                        <TableRow key={idx}>
                          <TableCell className="text-center">{idx + 1}</TableCell>
                          <TableCell className="font-mono">{loc.locationCode}</TableCell>
                          <TableCell>{loc.locationName}</TableCell>
                          <TableCell className="text-center">{context?.floor || "1"}</TableCell>
                          <TableCell className="text-center">{context?.zone || "A"}</TableCell>
                          <TableCell className="text-center">
                            {loc.rowNum.toString().padStart(2, "0")}
                          </TableCell>
                          <TableCell className="text-center">{loc.levelNum}</TableCell>
                          <TableCell className="text-center">{loc.locationType}</TableCell>
                          <TableCell className="text-center">-</TableCell>
                        </TableRow>
                      ))}
                    </TableBody>
                  </Table>
                </ScrollArea>
              </div>
            ) : (
              <div className="flex flex-col items-center justify-center rounded-lg border-2 border-dashed border-gray-200 py-8 text-gray-500">
                <Eye className="mb-2 h-8 w-8 text-gray-300" />
                <p>미리보기 생성 버튼을 클릭하여 결과를 확인하세요</p>
              </div>
            )}
          </CardContent>
        </Card>
      )}

      {/* 템플릿 다이얼로그 */}
      <Dialog open={isTemplateDialogOpen} onOpenChange={setIsTemplateDialogOpen}>
        <DialogContent className="max-w-md">
          <DialogHeader>
            <DialogTitle>
              {isSaveMode ? "템플릿 저장" : "템플릿 관리"}
            </DialogTitle>
          </DialogHeader>

          {isSaveMode ? (
            <div className="space-y-4">
              <div>
                <label className="mb-1 block text-sm font-medium">템플릿 이름</label>
                <Input
                  value={templateName}
                  onChange={(e) => setTemplateName(e.target.value)}
                  placeholder="템플릿 이름을 입력하세요"
                />
              </div>
              <DialogFooter>
                <Button variant="outline" onClick={() => setIsSaveMode(false)}>
                  취소
                </Button>
                <Button onClick={saveTemplate} disabled={!templateName.trim()}>
                  저장
                </Button>
              </DialogFooter>
            </div>
          ) : (
            <div className="space-y-4">
              {/* 저장 버튼 */}
              {conditions.length > 0 && (
                <Button
                  variant="outline"
                  className="w-full gap-2"
                  onClick={() => setIsSaveMode(true)}
                >
                  <Save className="h-4 w-4" />
                  현재 조건을 템플릿으로 저장
                </Button>
              )}

              {/* 템플릿 목록 */}
              {templates.length > 0 ? (
                <div className="space-y-2">
                  <div className="text-sm font-medium text-gray-700">저장된 템플릿</div>
                  <ScrollArea className="h-[200px]">
                    {templates.map((template) => (
                      <div
                        key={template.id}
                        className="flex items-center justify-between rounded-lg border p-3 hover:bg-gray-50"
                      >
                        <div>
                          <div className="font-medium">{template.name}</div>
                          <div className="text-xs text-gray-500">
                            {template.conditions.length}개 조건
                          </div>
                        </div>
                        <div className="flex gap-2">
                          <Button
                            variant="outline"
                            size="sm"
                            onClick={() => loadTemplate(template)}
                          >
                            불러오기
                          </Button>
                          <Button
                            variant="ghost"
                            size="sm"
                            onClick={() => deleteTemplate(template.id)}
                          >
                            <X className="h-4 w-4" />
                          </Button>
                        </div>
                      </div>
                    ))}
                  </ScrollArea>
                </div>
              ) : (
                <div className="py-8 text-center text-gray-500">
                  저장된 템플릿이 없습니다
                </div>
              )}
            </div>
          )}
        </DialogContent>
      </Dialog>
    </div>
  );
};

// Wrapper 컴포넌트 (레지스트리용)
export const RackStructureWrapper: React.FC<RackStructureComponentProps> = (props) => {
  return (
    <div className="h-full w-full overflow-auto p-4">
      <RackStructureComponent {...props} />
    </div>
  );
};