"use client";

/**
 * TableSettingsModal -- 하드코딩 페이지용 테이블 설정 모달 (3탭)
 *
 * 탭 1: 컬럼 설정 -- 컬럼 표시/숨김, 드래그 순서 변경, 너비(px) 설정, 틀고정
 * 탭 2: 필터 설정 -- 필터 활성/비활성, 필터 타입(텍스트/선택/날짜), 너비(%) 설정, 그룹별 합산
 * 탭 3: 그룹 설정 -- 그룹핑 컬럼 선택
 *
 * 설정값은 localStorage에 저장되며, onSave 콜백으로 부모 컴포넌트에 전달
 * DynamicSearchFilter, DataGrid와 함께 사용
 */

import React, { useState, useEffect } from "react";
import {
  Dialog, DialogContent, DialogHeader, DialogTitle, DialogDescription, DialogFooter,
} from "@/components/ui/dialog";
import { Tabs, TabsContent, TabsList, TabsTrigger } from "@/components/ui/tabs";
import { Button } from "@/components/ui/button";
import { Checkbox } from "@/components/ui/checkbox";
import { Input } from "@/components/ui/input";
import { Switch } from "@/components/ui/switch";
import {
  Select, SelectContent, SelectItem, SelectTrigger, SelectValue,
} from "@/components/ui/select";
import { GripVertical, Settings2, SlidersHorizontal, Layers, RotateCcw, Lock } from "lucide-react";
import { cn } from "@/lib/utils";
import { apiClient } from "@/lib/api/client";
import {
  DndContext, closestCenter, PointerSensor, useSensor, useSensors, DragEndEvent,
} from "@dnd-kit/core";
import {
  SortableContext, verticalListSortingStrategy, useSortable, arrayMove,
} from "@dnd-kit/sortable";
import { CSS } from "@dnd-kit/utilities";

// ===== 타입 =====

export interface ColumnSetting {
  columnName: string;
  displayName: string;
  visible: boolean;
  width: number;
}

export interface FilterSetting {
  columnName: string;
  displayName: string;
  enabled: boolean;
  filterType: "text" | "select" | "date";
  width: number;
}

export interface GroupSetting {
  columnName: string;
  displayName: string;
  enabled: boolean;
}

export interface TableSettings {
  columns: ColumnSetting[];
  filters: FilterSetting[];
  groups: GroupSetting[];
  frozenCount: number;
  groupSumEnabled: boolean;
}

export interface TableSettingsModalProps {
  open: boolean;
  onOpenChange: (open: boolean) => void;
  /** 테이블명 (web-types API 호출용) */
  tableName: string;
  /** localStorage 키 분리용 고유 ID */
  settingsId: string;
  /** 저장 시 콜백 */
  onSave?: (settings: TableSettings) => void;
  /** 초기 탭 */
  initialTab?: "columns" | "filters" | "groups";
}

// ===== 상수 =====

const FILTER_TYPE_OPTIONS = [
  { value: "text", label: "텍스트" },
  { value: "select", label: "선택" },
  { value: "date", label: "날짜" },
];

const AUTO_COLS = ["id", "created_date", "updated_date", "writer", "company_code"];

// ===== 유틸 =====

function getStorageKey(settingsId: string) {
  return `table_settings_${settingsId}`;
}

/** localStorage에서 저장된 설정 로드 (외부에서도 사용 가능) */
export function loadTableSettings(settingsId: string): TableSettings | null {
  try {
    const raw = localStorage.getItem(getStorageKey(settingsId));
    if (!raw) return null;
    return JSON.parse(raw);
  } catch {
    return null;
  }
}

/** 저장된 컬럼 순서/설정을 API 컬럼과 병합 */
function mergeColumns(fresh: ColumnSetting[], saved: ColumnSetting[]): ColumnSetting[] {
  const savedMap = new Map(saved.map((s) => [s.columnName, s]));
  const ordered: ColumnSetting[] = [];
  // 저장된 순서대로
  for (const s of saved) {
    const f = fresh.find((c) => c.columnName === s.columnName);
    if (f) ordered.push({ ...f, visible: s.visible, width: s.width });
  }
  // 새로 추가된 컬럼은 맨 뒤에
  for (const f of fresh) {
    if (!savedMap.has(f.columnName)) ordered.push(f);
  }
  return ordered;
}

// ===== Sortable Column Row (탭 1) =====

function SortableColumnRow({
  col,
  onToggleVisible,
  onWidthChange,
}: {
  col: ColumnSetting & { _idx: number };
  onToggleVisible: (idx: number) => void;
  onWidthChange: (idx: number, width: number) => void;
}) {
  const {
    attributes, listeners, setNodeRef, transform, transition, isDragging,
  } = useSortable({ id: col.columnName });

  const style: React.CSSProperties = {
    transform: CSS.Transform.toString(transform),
    transition,
    opacity: isDragging ? 0.5 : 1,
  };

  return (
    <div
      ref={setNodeRef}
      style={style}
      className={cn(
        "flex items-center gap-3 py-2 px-2 rounded hover:bg-muted/50",
        isDragging && "bg-muted/50 shadow-md",
      )}
    >
      {/* 드래그 핸들 */}
      <button
        {...attributes}
        {...listeners}
        className="cursor-grab active:cursor-grabbing shrink-0 text-muted-foreground hover:text-foreground"
      >
        <GripVertical className="h-4 w-4" />
      </button>

      {/* 표시 체크박스 */}
      <Checkbox
        checked={col.visible}
        onCheckedChange={() => onToggleVisible(col._idx)}
      />

      {/* 표시 토글 (Switch) */}
      <Switch
        checked={col.visible}
        onCheckedChange={() => onToggleVisible(col._idx)}
        className="shrink-0"
      />

      {/* 컬럼명 + 기술명 */}
      <div className="flex-1 min-w-0">
        <div className="text-sm font-medium truncate">{col.displayName}</div>
        <div className="text-xs text-muted-foreground truncate">{col.columnName}</div>
      </div>

      {/* 너비 입력 */}
      <div className="flex items-center gap-1.5 shrink-0">
        <span className="text-xs text-muted-foreground">너비:</span>
        <Input
          type="number"
          value={col.width}
          onChange={(e) => onWidthChange(col._idx, Number(e.target.value) || 100)}
          className="h-8 w-[70px] text-xs text-center"
          min={50}
          max={500}
        />
      </div>
    </div>
  );
}

// ===== TableSettingsModal =====

export function TableSettingsModal({
  open,
  onOpenChange,
  tableName,
  settingsId,
  onSave,
  initialTab = "columns",
}: TableSettingsModalProps) {
  const [activeTab, setActiveTab] = useState(initialTab);
  const [loading, setLoading] = useState(false);

  // 임시 설정 (모달 내에서만 수정, 저장 시 반영)
  const [tempColumns, setTempColumns] = useState<ColumnSetting[]>([]);
  const [tempFilters, setTempFilters] = useState<FilterSetting[]>([]);
  const [tempGroups, setTempGroups] = useState<GroupSetting[]>([]);
  const [tempFrozenCount, setTempFrozenCount] = useState(0);
  const [tempGroupSum, setTempGroupSum] = useState(false);

  // 원본 컬럼 (초기화용)
  const [defaultColumns, setDefaultColumns] = useState<ColumnSetting[]>([]);

  const sensors = useSensors(
    useSensor(PointerSensor, { activationConstraint: { distance: 5 } })
  );

  // 모달 열릴 때 데이터 로드
  useEffect(() => {
    if (!open) return;
    setActiveTab(initialTab);
    loadData();
  }, [open]); // eslint-disable-line react-hooks/exhaustive-deps

  const loadData = async () => {
    setLoading(true);
    try {
      const res = await apiClient.get(`/table-management/tables/${tableName}/web-types`);
      const types: any[] = res.data?.data || [];

      // 기본 컬럼 설정 생성
      const freshColumns: ColumnSetting[] = types
        .filter((t) => !AUTO_COLS.includes(t.columnName))
        .map((t) => ({
          columnName: t.columnName,
          displayName: t.displayName || t.columnLabel || t.columnName,
          visible: true,
          width: 120,
        }));

      // 기본 필터 설정 생성
      const freshFilters: FilterSetting[] = freshColumns.map((c) => {
        const wt = types.find((t) => t.columnName === c.columnName);
        let filterType: "text" | "select" | "date" = "text";
        if (wt?.inputType === "category" || wt?.inputType === "select") filterType = "select";
        else if (wt?.inputType === "date" || wt?.inputType === "datetime") filterType = "date";
        return {
          columnName: c.columnName,
          displayName: c.displayName,
          enabled: false,
          filterType,
          width: 25,
        };
      });

      // 기본 그룹 설정 생성
      const freshGroups: GroupSetting[] = freshColumns.map((c) => ({
        columnName: c.columnName,
        displayName: c.displayName,
        enabled: false,
      }));

      setDefaultColumns(freshColumns);

      // localStorage에서 저장된 설정 복원
      const saved = loadTableSettings(settingsId);
      if (saved) {
        setTempColumns(mergeColumns(freshColumns, saved.columns));
        setTempFilters(freshFilters.map((f) => {
          const s = saved.filters?.find((sf) => sf.columnName === f.columnName);
          return s ? { ...f, enabled: s.enabled, filterType: s.filterType, width: s.width } : f;
        }));
        setTempGroups(freshGroups.map((g) => {
          const s = saved.groups?.find((sg) => sg.columnName === g.columnName);
          return s ? { ...g, enabled: s.enabled } : g;
        }));
        setTempFrozenCount(saved.frozenCount || 0);
        setTempGroupSum(saved.groupSumEnabled || false);
      } else {
        setTempColumns(freshColumns);
        setTempFilters(freshFilters);
        setTempGroups(freshGroups);
        setTempFrozenCount(0);
        setTempGroupSum(false);
      }
    } catch (err) {
      console.error("테이블 설정 로드 실패:", err);
    } finally {
      setLoading(false);
    }
  };

  // 저장
  const handleSave = () => {
    const settings: TableSettings = {
      columns: tempColumns,
      filters: tempFilters,
      groups: tempGroups,
      frozenCount: tempFrozenCount,
      groupSumEnabled: tempGroupSum,
    };
    localStorage.setItem(getStorageKey(settingsId), JSON.stringify(settings));
    onSave?.(settings);
    onOpenChange(false);
  };

  // 컬럼 설정 초기화
  const handleResetColumns = () => {
    setTempColumns(defaultColumns.map((c) => ({ ...c })));
    setTempFrozenCount(0);
  };

  // ===== 컬럼 설정 핸들러 =====

  const handleDragEnd = (event: DragEndEvent) => {
    const { active, over } = event;
    if (!over || active.id === over.id) return;
    setTempColumns((prev) => {
      const oldIdx = prev.findIndex((c) => c.columnName === active.id);
      const newIdx = prev.findIndex((c) => c.columnName === over.id);
      return arrayMove(prev, oldIdx, newIdx);
    });
  };

  const toggleColumnVisible = (idx: number) => {
    setTempColumns((prev) => {
      const next = [...prev];
      next[idx] = { ...next[idx], visible: !next[idx].visible };
      return next;
    });
  };

  const changeColumnWidth = (idx: number, width: number) => {
    setTempColumns((prev) => {
      const next = [...prev];
      next[idx] = { ...next[idx], width };
      return next;
    });
  };

  // ===== 필터 설정 핸들러 =====

  const allFiltersEnabled = tempFilters.length > 0 && tempFilters.every((f) => f.enabled);

  const toggleFilterAll = (checked: boolean) => {
    setTempFilters((prev) => prev.map((f) => ({ ...f, enabled: checked })));
  };

  const toggleFilter = (idx: number) => {
    setTempFilters((prev) => {
      const next = [...prev];
      next[idx] = { ...next[idx], enabled: !next[idx].enabled };
      return next;
    });
  };

  const changeFilterType = (idx: number, filterType: "text" | "select" | "date") => {
    setTempFilters((prev) => {
      const next = [...prev];
      next[idx] = { ...next[idx], filterType };
      return next;
    });
  };

  const changeFilterWidth = (idx: number, width: number) => {
    setTempFilters((prev) => {
      const next = [...prev];
      next[idx] = { ...next[idx], width };
      return next;
    });
  };

  // ===== 그룹 설정 핸들러 =====

  const toggleGroup = (idx: number) => {
    setTempGroups((prev) => {
      const next = [...prev];
      next[idx] = { ...next[idx], enabled: !next[idx].enabled };
      return next;
    });
  };

  const visibleCount = tempColumns.filter((c) => c.visible).length;

  return (
    <Dialog open={open} onOpenChange={onOpenChange}>
      <DialogContent className="max-w-2xl max-h-[80vh] flex flex-col">
        <DialogHeader>
          <DialogTitle>테이블 설정</DialogTitle>
          <DialogDescription>테이블의 컬럼, 필터, 그룹화를 설정합니다</DialogDescription>
        </DialogHeader>

        {loading ? (
          <div className="flex items-center justify-center py-12 text-muted-foreground">
            로딩 중...
          </div>
        ) : (
          <Tabs value={activeTab} onValueChange={(v) => setActiveTab(v as typeof activeTab)} className="flex-1 flex flex-col min-h-0">
            <TabsList className="grid w-full grid-cols-3 shrink-0">
              <TabsTrigger value="columns" className="flex items-center gap-1.5">
                <Settings2 className="h-3.5 w-3.5" /> 컬럼 설정
              </TabsTrigger>
              <TabsTrigger value="filters" className="flex items-center gap-1.5">
                <SlidersHorizontal className="h-3.5 w-3.5" /> 필터 설정
              </TabsTrigger>
              <TabsTrigger value="groups" className="flex items-center gap-1.5">
                <Layers className="h-3.5 w-3.5" /> 그룹 설정
              </TabsTrigger>
            </TabsList>

            {/* ===== 탭 1: 컬럼 설정 ===== */}
            <TabsContent value="columns" className="flex-1 overflow-auto mt-0 pt-3">
              {/* 헤더: 표시 수 / 틀고정 / 초기화 */}
              <div className="flex items-center justify-between px-2 pb-3 border-b mb-2">
                <div className="flex items-center gap-3 text-sm">
                  <span>
                    {visibleCount}/{tempColumns.length}개 컬럼 표시 중
                  </span>
                  <div className="flex items-center gap-1.5">
                    <Lock className="h-3.5 w-3.5 text-muted-foreground" />
                    <span className="text-muted-foreground">틀고정:</span>
                    <Input
                      type="number"
                      value={tempFrozenCount}
                      onChange={(e) =>
                        setTempFrozenCount(
                          Math.min(Math.max(0, Number(e.target.value) || 0), tempColumns.length)
                        )
                      }
                      className="h-7 w-[50px] text-xs text-center"
                      min={0}
                      max={tempColumns.length}
                    />
                    <span className="text-muted-foreground text-sm">개 컬럼</span>
                  </div>
                </div>
                <Button variant="ghost" size="sm" onClick={handleResetColumns} className="text-xs">
                  초기화
                </Button>
              </div>

              {/* 컬럼 목록 (드래그 순서 변경 가능) */}
              <DndContext sensors={sensors} collisionDetection={closestCenter} onDragEnd={handleDragEnd}>
                <SortableContext
                  items={tempColumns.map((c) => c.columnName)}
                  strategy={verticalListSortingStrategy}
                >
                  <div className="space-y-0.5">
                    {tempColumns.map((col, idx) => (
                      <SortableColumnRow
                        key={col.columnName}
                        col={{ ...col, _idx: idx }}
                        onToggleVisible={toggleColumnVisible}
                        onWidthChange={changeColumnWidth}
                      />
                    ))}
                  </div>
                </SortableContext>
              </DndContext>
            </TabsContent>

            {/* ===== 탭 2: 필터 설정 ===== */}
            <TabsContent value="filters" className="flex-1 overflow-auto mt-0 pt-3">
              {/* 전체 선택 */}
              <div
                className="flex items-center gap-2 px-2 pb-3 border-b mb-2 cursor-pointer"
                onClick={() => toggleFilterAll(!allFiltersEnabled)}
              >
                <Checkbox checked={allFiltersEnabled} />
                <span className="text-sm">전체 선택</span>
              </div>

              {/* 필터 목록 */}
              <div className="space-y-1">
                {tempFilters.map((filter, idx) => (
                  <div
                    key={filter.columnName}
                    className="flex items-center gap-3 py-1.5 px-2 hover:bg-muted/50 rounded"
                  >
                    <Checkbox
                      checked={filter.enabled}
                      onCheckedChange={() => toggleFilter(idx)}
                    />
                    <div className="flex-1 text-sm min-w-0 truncate">{filter.displayName}</div>
                    <Select
                      value={filter.filterType}
                      onValueChange={(v) => changeFilterType(idx, v as any)}
                    >
                      <SelectTrigger className="h-8 w-[90px] text-xs">
                        <SelectValue />
                      </SelectTrigger>
                      <SelectContent>
                        {FILTER_TYPE_OPTIONS.map((opt) => (
                          <SelectItem key={opt.value} value={opt.value}>
                            {opt.label}
                          </SelectItem>
                        ))}
                      </SelectContent>
                    </Select>
                    <div className="flex items-center gap-1 shrink-0">
                      <Input
                        type="number"
                        value={filter.width}
                        onChange={(e) => changeFilterWidth(idx, Number(e.target.value) || 25)}
                        className="h-8 w-[55px] text-xs text-center"
                        min={10}
                        max={100}
                      />
                      <span className="text-xs text-muted-foreground">%</span>
                    </div>
                  </div>
                ))}
              </div>

              {/* 그룹별 합산 토글 */}
              <div className="mt-4 flex items-center justify-between rounded-lg border p-3">
                <div>
                  <div className="text-sm font-medium">그룹별 합산</div>
                  <div className="text-xs text-muted-foreground">같은 값끼리 그룹핑하여 합산</div>
                </div>
                <Switch checked={tempGroupSum} onCheckedChange={setTempGroupSum} />
              </div>
            </TabsContent>

            {/* ===== 탭 3: 그룹 설정 ===== */}
            <TabsContent value="groups" className="flex-1 overflow-auto mt-0 pt-3">
              <div className="px-2 pb-3 border-b mb-2">
                <span className="text-sm font-medium">사용 가능한 컬럼</span>
              </div>

              <div className="space-y-0.5">
                {tempGroups.map((group, idx) => (
                  <div
                    key={group.columnName}
                    className={cn(
                      "flex items-center gap-3 py-2.5 px-3 rounded cursor-pointer hover:bg-muted/50",
                      group.enabled && "bg-primary/5",
                    )}
                    onClick={() => toggleGroup(idx)}
                  >
                    <Checkbox checked={group.enabled} />
                    <div className="flex-1 min-w-0">
                      <div className="text-sm font-medium truncate">{group.displayName}</div>
                      <div className="text-xs text-muted-foreground truncate">{group.columnName}</div>
                    </div>
                  </div>
                ))}
              </div>
            </TabsContent>
          </Tabs>
        )}

        <DialogFooter className="shrink-0">
          <Button variant="outline" onClick={() => onOpenChange(false)}>
            취소
          </Button>
          <Button onClick={handleSave}>저장</Button>
        </DialogFooter>
      </DialogContent>
    </Dialog>
  );
}