"use client";

import React, { useState, useEffect, useRef, useMemo } from "react";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Settings, Filter, Layers, X, Check, ChevronsUpDown } from "lucide-react";
import { useTableOptions } from "@/contexts/TableOptionsContext";
import { useTableSearchWidgetHeight } from "@/contexts/TableSearchWidgetHeightContext";
import { ColumnVisibilityPanel } from "@/components/screen/table-options/ColumnVisibilityPanel";
import { FilterPanel } from "@/components/screen/table-options/FilterPanel";
import { GroupingPanel } from "@/components/screen/table-options/GroupingPanel";
import { TableFilter } from "@/types/table-options";
import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "@/components/ui/select";
import { ModernDatePicker } from "@/components/screen/filters/ModernDatePicker";
import { useScreenPreview } from "@/contexts/ScreenPreviewContext";
import { Popover, PopoverContent, PopoverTrigger } from "@/components/ui/popover";
import { Checkbox } from "@/components/ui/checkbox";
import { cn } from "@/lib/utils";

interface PresetFilter {
  id: string;
  columnName: string;
  columnLabel: string;
  filterType: "text" | "number" | "date" | "select";
  width?: number;
  multiSelect?: boolean; // 다중선택 여부 (select 타입에서만 사용)
}

interface TableSearchWidgetProps {
  component: {
    id: string;
    title?: string;
    style?: {
      width?: string;
      height?: string;
      padding?: string;
      backgroundColor?: string;
    };
    componentConfig?: {
      autoSelectFirstTable?: boolean; // 첫 번째 테이블 자동 선택 여부
      showTableSelector?: boolean; // 테이블 선택 드롭다운 표시 여부
      filterMode?: "dynamic" | "preset"; // 필터 모드
      presetFilters?: PresetFilter[]; // 고정 필터 목록
      targetPanelPosition?: "left" | "right" | "auto"; // 분할 패널에서 대상 패널 위치 (기본: "left")
    };
  };
  screenId?: number; // 화면 ID
  onHeightChange?: (height: number) => void; // 높이 변화 콜백
}

export function TableSearchWidget({ component, screenId, onHeightChange }: TableSearchWidgetProps) {
  const { registeredTables, selectedTableId, setSelectedTableId, getTable } = useTableOptions();
  const { isPreviewMode } = useScreenPreview(); // 미리보기 모드 확인

  // 높이 관리 context (실제 화면에서만 사용)
  let setWidgetHeight:
    | ((screenId: number, componentId: string, height: number, originalHeight: number) => void)
    | undefined;
  try {
    const heightContext = useTableSearchWidgetHeight();
    setWidgetHeight = heightContext.setWidgetHeight;
  } catch (e) {
    // Context가 없으면 (디자이너 모드) 무시
    setWidgetHeight = undefined;
  }

  const [columnVisibilityOpen, setColumnVisibilityOpen] = useState(false);
  const [filterOpen, setFilterOpen] = useState(false);
  const [groupingOpen, setGroupingOpen] = useState(false);

  // 활성화된 필터 목록
  const [activeFilters, setActiveFilters] = useState<TableFilter[]>([]);
  const [filterValues, setFilterValues] = useState<Record<string, any>>({});
  // select 타입 필터의 옵션들
  const [selectOptions, setSelectOptions] = useState<Record<string, Array<{ label: string; value: string }>>>({});
  // 선택된 값의 라벨 저장 (데이터 없을 때도 라벨 유지)
  const [selectedLabels, setSelectedLabels] = useState<Record<string, string>>({});

  // 높이 감지를 위한 ref
  const containerRef = useRef<HTMLDivElement>(null);

  const autoSelectFirstTable = component.componentConfig?.autoSelectFirstTable ?? true;
  const showTableSelector = component.componentConfig?.showTableSelector ?? true;
  const filterMode = component.componentConfig?.filterMode ?? "dynamic";
  const presetFilters = component.componentConfig?.presetFilters ?? [];
  const targetPanelPosition = component.componentConfig?.targetPanelPosition ?? "left"; // 기본값: 좌측 패널

  // Map을 배열로 변환
  const allTableList = Array.from(registeredTables.values());
  
  // 대상 패널 위치에 따라 테이블 필터링 (tableId 패턴 기반)
  const tableList = useMemo(() => {
    // "auto"면 모든 테이블 반환
    if (targetPanelPosition === "auto") {
      return allTableList;
    }

    // 테이블 ID 패턴으로 필터링
    // card-display-XXX: 좌측 패널 (카드 디스플레이)
    // datatable-XXX, table-list-XXX: 우측 패널 (테이블 리스트)
    const filteredTables = allTableList.filter(table => {
      const tableId = table.tableId.toLowerCase();
      
      if (targetPanelPosition === "left") {
        // 좌측 패널 대상: card-display만
        return tableId.includes("card-display") || tableId.includes("card");
      } else if (targetPanelPosition === "right") {
        // 우측 패널 대상: datatable, table-list 등 (card-display 제외)
        const isCardDisplay = tableId.includes("card-display") || tableId.includes("card");
        return !isCardDisplay;
      }
      
      return true;
    });

    // 필터링된 결과가 없으면 모든 테이블 반환 (폴백)
    if (filteredTables.length === 0) {
      return allTableList;
    }

    return filteredTables;
  }, [allTableList, targetPanelPosition]);

  // currentTable은 tableList(필터링된 목록)에서 가져와야 함
  const currentTable = useMemo(() => {
    if (!selectedTableId) return undefined;
    
    // 먼저 tableList(필터링된 목록)에서 찾기
    const tableFromList = tableList.find(t => t.tableId === selectedTableId);
    if (tableFromList) {
      return tableFromList;
    }
    
    // tableList에 없으면 전체에서 찾기 (폴백)
    return getTable(selectedTableId);
  }, [selectedTableId, tableList, getTable]);

  // 대상 패널의 첫 번째 테이블 자동 선택
  useEffect(() => {
    if (!autoSelectFirstTable || tableList.length === 0) {
      return;
    }

    // 현재 선택된 테이블이 대상 패널에 있는지 확인
    const isCurrentTableInTarget = selectedTableId && tableList.some(t => t.tableId === selectedTableId);

    // 현재 선택된 테이블이 대상 패널에 없으면 대상 패널의 첫 번째 테이블 선택
    if (!selectedTableId || !isCurrentTableInTarget) {
      const targetTable = tableList[0];
      setSelectedTableId(targetTable.tableId);
    }
  }, [tableList, selectedTableId, autoSelectFirstTable, setSelectedTableId, targetPanelPosition]);

  // 현재 테이블의 저장된 필터 불러오기 (동적 모드) 또는 고정 필터 적용 (고정 모드)
  useEffect(() => {
    if (!currentTable?.tableName) return;

    // 고정 모드: presetFilters를 activeFilters로 설정
    if (filterMode === "preset") {
      const activeFiltersList: TableFilter[] = presetFilters.map((f) => ({
        columnName: f.columnName,
        operator: "contains",
        value: "",
        filterType: f.filterType,
        width: f.width || 200,
      }));
      setActiveFilters(activeFiltersList);
      return;
    }

    // 동적 모드: 화면별로 독립적인 필터 설정 불러오기
    const storageKey = screenId 
      ? `table_filters_${currentTable.tableName}_screen_${screenId}`
      : `table_filters_${currentTable.tableName}`;
    const savedFilters = localStorage.getItem(storageKey);

    if (savedFilters) {
      try {
        const parsed = JSON.parse(savedFilters) as Array<{
          columnName: string;
          columnLabel: string;
          inputType: string;
          enabled: boolean;
          filterType: "text" | "number" | "date" | "select";
          width?: number;
        }>;

        // enabled된 필터들만 activeFilters로 설정
        const activeFiltersList: TableFilter[] = parsed
          .filter((f) => f.enabled)
          .map((f) => ({
            columnName: f.columnName,
            operator: "contains",
            value: "",
            filterType: f.filterType,
            width: f.width || 200, // 저장된 너비 포함
          }));

        setActiveFilters(activeFiltersList);
      } catch (error) {
        console.error("저장된 필터 불러오기 실패:", error);
      }
    }
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [currentTable?.tableName, filterMode, screenId, JSON.stringify(presetFilters)]);

  // select 옵션 초기 로드 (한 번만 실행, 이후 유지)
  useEffect(() => {
    if (!currentTable?.getColumnUniqueValues || activeFilters.length === 0) {
      return;
    }

    const loadSelectOptions = async () => {
      const selectFilters = activeFilters.filter((f) => f.filterType === "select");

      if (selectFilters.length === 0) {
        return;
      }

      const newOptions: Record<string, Array<{ label: string; value: string }>> = { ...selectOptions };

      for (const filter of selectFilters) {
        // 이미 로드된 옵션이 있으면 스킵 (초기값 유지)
        if (newOptions[filter.columnName] && newOptions[filter.columnName].length > 0) {
          continue;
        }

        try {
          const options = await currentTable.getColumnUniqueValues(filter.columnName);
          newOptions[filter.columnName] = options;
        } catch (error) {
          console.error("❌ [TableSearchWidget] select 옵션 로드 실패:", filter.columnName, error);
        }
      }
      setSelectOptions(newOptions);
    };

    loadSelectOptions();
  }, [activeFilters, currentTable?.tableName, currentTable?.getColumnUniqueValues]); // dataCount 제거, tableName으로 변경

  // 높이 변화 감지 및 알림 (실제 화면에서만)
  useEffect(() => {
    if (!containerRef.current || !screenId || !setWidgetHeight) return;

    // 컴포넌트의 원래 높이 (디자이너에서 설정한 높이)
    const originalHeight = (component as any).size?.height || 50;

    const resizeObserver = new ResizeObserver((entries) => {
      for (const entry of entries) {
        const newHeight = entry.contentRect.height;

        // Context에 높이 저장 (다른 컴포넌트 위치 조정에 사용)
        setWidgetHeight(screenId, component.id, newHeight, originalHeight);

        // localStorage에 높이 저장 (새로고침 시 복원용)
        localStorage.setItem(
          `table_search_widget_height_screen_${screenId}_${component.id}`,
          JSON.stringify({ height: newHeight, originalHeight }),
        );

        // 콜백이 있으면 호출
        if (onHeightChange) {
          onHeightChange(newHeight);
        }
      }
    });

    resizeObserver.observe(containerRef.current);

    return () => {
      resizeObserver.disconnect();
    };
  }, [screenId, component.id, setWidgetHeight, onHeightChange]);

  // 화면 로딩 시 저장된 높이 복원
  useEffect(() => {
    if (!screenId || !setWidgetHeight) return;

    const storageKey = `table_search_widget_height_screen_${screenId}_${component.id}`;
    const savedData = localStorage.getItem(storageKey);

    if (savedData) {
      try {
        const { height, originalHeight } = JSON.parse(savedData);
        setWidgetHeight(screenId, component.id, height, originalHeight);
      } catch (error) {
        console.error("저장된 높이 복원 실패:", error);
      }
    }
  }, [screenId, component.id, setWidgetHeight]);

  const hasMultipleTables = tableList.length > 1;

  // 필터 값 변경 핸들러
  const handleFilterChange = (columnName: string, value: any) => {
    const newValues = {
      ...filterValues,
      [columnName]: value,
    };

    setFilterValues(newValues);

    // 실시간 검색: 값 변경 시 즉시 필터 적용
    applyFilters(newValues);
  };

  // 필터 적용 함수
  const applyFilters = (values: Record<string, any> = filterValues) => {
    // 빈 값이 아닌 필터만 적용
    const filtersWithValues = activeFilters
      .map((filter) => {
        let filterValue = values[filter.columnName];
        
        // 날짜 범위 객체를 처리
        if (filter.filterType === "date" && filterValue && typeof filterValue === "object" && (filterValue.from || filterValue.to)) {
          // 날짜 범위 객체를 문자열 형식으로 변환 (백엔드 재시작 불필요)
          const formatDate = (date: Date) => {
            const year = date.getFullYear();
            const month = String(date.getMonth() + 1).padStart(2, '0');
            const day = String(date.getDate()).padStart(2, '0');
            return `${year}-${month}-${day}`;
          };
          
          // "YYYY-MM-DD|YYYY-MM-DD" 형식으로 변환
          const fromStr = filterValue.from ? formatDate(filterValue.from) : "";
          const toStr = filterValue.to ? formatDate(filterValue.to) : "";
          
          if (fromStr && toStr) {
            // 둘 다 있으면 파이프로 연결
            filterValue = `${fromStr}|${toStr}`;
          } else if (fromStr) {
            // 시작일만 있으면
            filterValue = `${fromStr}|`;
          } else if (toStr) {
            // 종료일만 있으면
            filterValue = `|${toStr}`;
          } else {
            filterValue = "";
          }
        }
        
        // 다중선택 배열을 처리 (파이프로 연결된 문자열로 변환)
        if (filter.filterType === "select" && Array.isArray(filterValue)) {
          filterValue = filterValue.join("|");
        }
        
        return {
          ...filter,
          value: filterValue || "",
        };
      })
      .filter((f) => {
        // 빈 값 체크
        if (!f.value) return false;
        if (typeof f.value === "string" && f.value === "") return false;
        if (Array.isArray(f.value) && f.value.length === 0) return false;
        return true;
      });

    currentTable?.onFilterChange(filtersWithValues);
  };

  // 필터 초기화
  const handleResetFilters = () => {
    setFilterValues({});
    setSelectedLabels({});
    currentTable?.onFilterChange([]);
  };

  // 필터 입력 필드 렌더링
  const renderFilterInput = (filter: TableFilter) => {
    const column = currentTable?.columns.find((c) => c.columnName === filter.columnName);
    const value = filterValues[filter.columnName] || "";
    const width = filter.width || 200; // 기본 너비 200px

    switch (filter.filterType) {
      case "date":
        return (
          <div style={{ width: `${width}px` }}>
            <ModernDatePicker
              label={column?.columnLabel || filter.columnName}
              value={value ? (typeof value === 'string' ? { from: new Date(value), to: new Date(value) } : value) : {}}
              onChange={(dateRange) => {
                if (dateRange.from && dateRange.to) {
                  // 기간이 선택되면 from과 to를 모두 저장
                  handleFilterChange(filter.columnName, dateRange);
                } else {
                  handleFilterChange(filter.columnName, "");
                }
              }}
              includeTime={false}
            />
          </div>
        );

      case "number":
        return (
          <Input
            type="number"
            value={value}
            onChange={(e) => handleFilterChange(filter.columnName, e.target.value)}
            className="h-9 text-xs focus-visible:ring-0 focus-visible:ring-offset-0 focus-visible:outline-none sm:text-sm"
            style={{ width: `${width}px`, height: "36px", minHeight: "36px", outline: "none", boxShadow: "none" }}
            placeholder={column?.columnLabel}
          />
        );

      case "select": {
        let options = selectOptions[filter.columnName] || [];

        // 중복 제거 (value 기준)
        const uniqueOptions = options.reduce(
          (acc, option) => {
            if (!acc.find((opt) => opt.value === option.value)) {
              acc.push(option);
            }
            return acc;
          },
          [] as Array<{ value: string; label: string }>,
        );

        // 항상 다중선택 모드
        const selectedValues: string[] = Array.isArray(value) ? value : (value ? [value] : []);
        
        // 선택된 값들의 라벨 표시
        const getDisplayText = () => {
          if (selectedValues.length === 0) return column?.columnLabel || "선택";
          if (selectedValues.length === 1) {
            const opt = uniqueOptions.find(o => o.value === selectedValues[0]);
            return opt?.label || selectedValues[0];
          }
          return `${selectedValues.length}개 선택됨`;
        };

        const handleMultiSelectChange = (optionValue: string, checked: boolean) => {
          let newValues: string[];
          if (checked) {
            newValues = [...selectedValues, optionValue];
          } else {
            newValues = selectedValues.filter(v => v !== optionValue);
          }
          handleFilterChange(filter.columnName, newValues.length > 0 ? newValues : "");
        };

        return (
          <Popover>
            <PopoverTrigger asChild>
              <Button
                variant="outline"
                role="combobox"
                className={cn(
                  "h-9 min-h-9 justify-between text-xs font-normal focus:ring-0 focus:outline-none focus-visible:ring-0 focus-visible:ring-offset-0 sm:text-sm",
                  selectedValues.length === 0 && "text-muted-foreground"
                )}
                style={{ width: `${width}px`, height: "36px", minHeight: "36px", outline: "none", boxShadow: "none" }}
              >
                <span className="truncate">{getDisplayText()}</span>
                <ChevronsUpDown className="ml-2 h-4 w-4 shrink-0 opacity-50" />
              </Button>
            </PopoverTrigger>
            <PopoverContent 
              className="p-0" 
              style={{ width: `${width}px` }}
              align="start"
            >
              <div className="max-h-60 overflow-auto">
                {uniqueOptions.length === 0 ? (
                  <div className="text-muted-foreground px-3 py-2 text-xs">옵션 없음</div>
                ) : (
                  <div className="p-1">
                    {uniqueOptions.map((option, index) => (
                      <div
                        key={`${filter.columnName}-multi-${option.value}-${index}`}
                        className="flex items-center space-x-2 rounded-sm px-2 py-1.5 hover:bg-accent cursor-pointer"
                        onClick={() => handleMultiSelectChange(option.value, !selectedValues.includes(option.value))}
                      >
                        <Checkbox
                          checked={selectedValues.includes(option.value)}
                          onCheckedChange={(checked) => handleMultiSelectChange(option.value, checked as boolean)}
                          onClick={(e) => e.stopPropagation()}
                        />
                        <span className="text-xs sm:text-sm">{option.label}</span>
                      </div>
                    ))}
                  </div>
                )}
              </div>
              {selectedValues.length > 0 && (
                <div className="border-t p-1">
                  <Button
                    variant="ghost"
                    size="sm"
                    className="w-full h-7 text-xs"
                    onClick={() => handleFilterChange(filter.columnName, "")}
                  >
                    선택 초기화
                  </Button>
                </div>
              )}
            </PopoverContent>
          </Popover>
        );
      }

      default: // text
        return (
          <Input
            type="text"
            value={value}
            onChange={(e) => handleFilterChange(filter.columnName, e.target.value)}
            className="h-9 text-xs focus-visible:ring-0 focus-visible:ring-offset-0 focus-visible:outline-none sm:text-sm"
            style={{ width: `${width}px`, height: "36px", minHeight: "36px", outline: "none", boxShadow: "none" }}
            placeholder={column?.columnLabel}
          />
        );
    }
  };

  return (
    <div
      ref={containerRef}
      className="bg-card flex w-full flex-wrap items-center gap-2 border-b"
      style={{
        padding: component.style?.padding || "0.75rem",
        backgroundColor: component.style?.backgroundColor,
        minHeight: "48px",
      }}
    >
      {/* 필터 입력 필드들 */}
      {activeFilters.length > 0 && (
        <div className="flex flex-1 flex-wrap items-center gap-2">
          {activeFilters.map((filter) => (
            <div key={filter.columnName}>{renderFilterInput(filter)}</div>
          ))}

          {/* 초기화 버튼 */}
          <Button variant="outline" size="sm" onClick={handleResetFilters} className="h-9 shrink-0 text-xs sm:text-sm">
            <X className="mr-1 h-3 w-3 sm:h-4 sm:w-4" />
            초기화
          </Button>
        </div>
      )}

      {/* 필터가 없을 때는 빈 공간 */}
      {activeFilters.length === 0 && <div className="flex-1" />}

      {/* 오른쪽: 데이터 건수 + 설정 버튼들 (고정 모드에서는 숨김) */}
      <div className="flex flex-shrink-0 items-center gap-2">
        {/* 데이터 건수 표시 */}
        {currentTable?.dataCount !== undefined && (
          <div className="bg-muted text-muted-foreground rounded-md px-3 py-1.5 text-xs font-medium sm:text-sm">
            {currentTable.dataCount.toLocaleString()}건
          </div>
        )}

        {/* 동적 모드일 때만 설정 버튼들 표시 (미리보기에서는 비활성화) */}
        {filterMode === "dynamic" && (
          <>
            <Button
              variant="outline"
              size="sm"
              onClick={() => !isPreviewMode && setColumnVisibilityOpen(true)}
              disabled={!selectedTableId || isPreviewMode}
              className="h-8 text-xs sm:h-9 sm:text-sm"
            >
              <Settings className="mr-1 h-3 w-3 sm:h-4 sm:w-4" />
              테이블 옵션
            </Button>

            <Button
              variant="outline"
              size="sm"
              onClick={() => !isPreviewMode && setFilterOpen(true)}
              disabled={!selectedTableId || isPreviewMode}
              className="h-8 text-xs sm:h-9 sm:text-sm"
            >
              <Filter className="mr-1 h-3 w-3 sm:h-4 sm:w-4" />
              필터 설정
            </Button>

            <Button
              variant="outline"
              size="sm"
              onClick={() => !isPreviewMode && setGroupingOpen(true)}
              disabled={!selectedTableId || isPreviewMode}
              className="h-8 text-xs sm:h-9 sm:text-sm"
            >
              <Layers className="mr-1 h-3 w-3 sm:h-4 sm:w-4" />
              그룹 설정
            </Button>
          </>
        )}
      </div>

      {/* 패널들 */}
      <ColumnVisibilityPanel isOpen={columnVisibilityOpen} onClose={() => setColumnVisibilityOpen(false)} />
      <FilterPanel
        isOpen={filterOpen}
        onClose={() => setFilterOpen(false)}
        onFiltersApplied={(filters) => setActiveFilters(filters)}
        screenId={screenId}
      />
      <GroupingPanel isOpen={groupingOpen} onClose={() => setGroupingOpen(false)} />
    </div>
  );
}