"use client"

import * as React from "react"
import type { DataTableFilterField, ExtendedSortingState } from "@/types/table"
import {
  getCoreRowModel,
  getFacetedRowModel,
  getFacetedUniqueValues,
  getFilteredRowModel,
  getPaginationRowModel,
  getSortedRowModel,
  getGroupedRowModel,
  getExpandedRowModel,
  useReactTable,
  type ColumnFiltersState,
  type PaginationState,
  type RowSelectionState,
  type SortingState,
  type TableOptions,
  type TableState,
  type Updater,
  type VisibilityState,
  type ExpandedState,
} from "@tanstack/react-table"
import {
  parseAsArrayOf,
  parseAsInteger,
  parseAsString,
  useQueryState,
  useQueryStates,
  type Parser,
  type UseQueryStateOptions,
} from "nuqs"

import { getSortingStateParser } from "@/lib/parsers"
import { useDebouncedCallback } from "@/hooks/use-debounced-callback"

interface UseDataTableProps<TData>
  extends Omit<
      TableOptions<TData>,
      | "state"
      | "pageCount"
      | "getCoreRowModel"
      | "manualFiltering"
      | "manualPagination"
      | "manualSorting"
      | "onGroupingChange"
      | "onExpandedChange"
      | "getExpandedRowModel"
    >,
    Required<Pick<TableOptions<TData>, "pageCount">> {
  filterFields?: DataTableFilterField<TData>[]
  enableAdvancedFilter?: boolean
  history?: "push" | "replace"
  scroll?: boolean
  shallow?: boolean
  throttleMs?: number
  debounceMs?: number
  startTransition?: React.TransitionStartFunction
  clearOnDefault?: boolean
  initialState?: Omit<Partial<TableState>, "sorting"> & {
    sorting?: ExtendedSortingState<TData>
    /**
     * 기본 그룹핑 컬럼 배열 (멀티 그룹핑)
     */
    grouping?: string[]
    /**
     * 그룹 확장/접기 상태
     */
    expanded?: Record<string, boolean>
  }
}

export function useDataTable<TData>({
  pageCount = -1,
  filterFields = [],
  enableAdvancedFilter = false,
  history = "replace",
  scroll = false,
  shallow = true,
  throttleMs = 50,
  debounceMs = 300,
  clearOnDefault = false,
  startTransition,
  initialState,
  ...props
}: UseDataTableProps<TData>) {
  // 공통 URL QueryState 옵션
  const queryStateOptions = React.useMemo<
    Omit<UseQueryStateOptions<string>, "parse">
  >(() => {
    return {
      history,
      scroll,
      shallow,
      throttleMs,
      debounceMs,
      clearOnDefault,
      startTransition,
    }
  }, [
    history,
    scroll,
    shallow,
    throttleMs,
    debounceMs,
    clearOnDefault,
    startTransition,
  ])

  // -------- RowSelection & ColumnVisibility는 URL 동기화 없이 로컬 상태 ----------
  const [rowSelection, setRowSelection] = React.useState<RowSelectionState>(
    initialState?.rowSelection ?? {}
  )
  const [columnVisibility, setColumnVisibility] =
    React.useState<VisibilityState>(initialState?.columnVisibility ?? {})

  // -------- Pagination (page, perPage) URL 동기화 --------
  const [page, setPage] = useQueryState(
    "page",
    parseAsInteger.withOptions(queryStateOptions).withDefault(1)
  )
  const [perPage, setPerPage] = useQueryState(
    "perPage",
    parseAsInteger
      .withOptions(queryStateOptions)
      .withDefault(initialState?.pagination?.pageSize ?? 10)
  )

  // -------- Sorting (sort) URL 동기화 --------
  const [sorting, setSorting] = useQueryState(
    "sort",
    getSortingStateParser<TData>()
      .withOptions(queryStateOptions)
      .withDefault(initialState?.sorting ?? [])
  )
  function onSortingChange(updaterOrValue: Updater<SortingState>) {
    if (typeof updaterOrValue === "function") {
      const newSorting = updaterOrValue(sorting) as ExtendedSortingState<TData>
      void setSorting(newSorting)
    } else {
      void setSorting(updaterOrValue as ExtendedSortingState<TData>)
    }
  }

  // -------- Grouping (group) URL 동기화 (멀티 컬럼) --------
  const [grouping, setGrouping] = useQueryState(
    "group",
    parseAsArrayOf(parseAsString, ",")
      .withOptions(queryStateOptions)
      .withDefault(initialState?.grouping ?? [])
  )
  function onGroupingChange(updaterOrValue: Updater<string[]>) {
    if (typeof updaterOrValue === "function") {
      const newGrouping = updaterOrValue(grouping)
      void setGrouping(newGrouping)
    } else {
      void setGrouping(updaterOrValue)
    }
  }

  // -------- Group Expand/Collapse --------
  const [expanded, setExpanded] = React.useState<ExpandedState>({}) // or true/false

  function onExpandedChange(updater: Updater<ExpandedState>) {
    setExpanded((old) => (typeof updater === "function" ? updater(old) : updater))
  }
  
  // -------- Filters (search/faceted) URL 동기화 --------
  const filterParsers = React.useMemo(() => {
    return filterFields.reduce<
      Record<string, Parser<string> | Parser<string[]>>
    >((acc, field) => {
      if (field.options) {
        // Faceted filter -> 여러 값 가능
        acc[field.id] = parseAsArrayOf(parseAsString, ",").withOptions(
          queryStateOptions
        )
      } else {
        // Search filter -> 단일 값
        acc[field.id] = parseAsString.withOptions(queryStateOptions)
      }
      return acc
    }, {})
  }, [filterFields, queryStateOptions])

  const [filterValues, setFilterValues] = useQueryStates(filterParsers)
  const debouncedSetFilterValues = useDebouncedCallback(
    setFilterValues,
    debounceMs
  )

  // -------- PaginationState 객체 --------
  const pagination: PaginationState = {
    pageIndex: page - 1,
    pageSize: perPage,
  }
  function onPaginationChange(updaterOrValue: Updater<PaginationState>) {
    if (typeof updaterOrValue === "function") {
      const newPagination = updaterOrValue(pagination)
      void setPage(newPagination.pageIndex + 1)
      void setPerPage(newPagination.pageSize)
    } else {
      void setPage(updaterOrValue.pageIndex + 1)
      void setPerPage(updaterOrValue.pageSize)
    }
  }

  // -------- ColumnFiltersState --------
  const initialColumnFilters: ColumnFiltersState = React.useMemo(() => {
    // AdvancedFilter 모드가 아니면 URL에서 온 filterValues를 그대로 적용
    return enableAdvancedFilter
      ? []
      : Object.entries(filterValues).reduce<ColumnFiltersState>(
          (filters, [key, value]) => {
            if (value !== null) {
              filters.push({
                id: key,
                value: Array.isArray(value) ? value : [value],
              })
            }
            return filters
          },
          []
        )
  }, [filterValues, enableAdvancedFilter])

  const [columnFilters, setColumnFilters] =
    React.useState<ColumnFiltersState>(initialColumnFilters)

  // 검색용 / Facet 필터용 컬럼 구분
  const { searchableColumns, filterableColumns } = React.useMemo(() => {
    return enableAdvancedFilter
      ? { searchableColumns: [], filterableColumns: [] }
      : {
          searchableColumns: filterFields.filter((field) => !field.options),
          filterableColumns: filterFields.filter((field) => field.options),
        }
  }, [filterFields, enableAdvancedFilter])

  const onColumnFiltersChange = React.useCallback(
    (updaterOrValue: Updater<ColumnFiltersState>) => {
      if (enableAdvancedFilter) return
      setColumnFilters((prev) => {
        const next =
          typeof updaterOrValue === "function"
            ? updaterOrValue(prev)
            : updaterOrValue

        const filterUpdates = next.reduce<
          Record<string, string | string[] | null>
        >((acc, filter) => {
          if (searchableColumns.find((col) => col.id === filter.id)) {
            acc[filter.id] = filter.value as string
          } else if (filterableColumns.find((col) => col.id === filter.id)) {
            acc[filter.id] = filter.value as string[]
          }
          return acc
        }, {})

        // 빠진 필터는 null로 설정
        prev.forEach((prevFilter) => {
          if (!next.some((filter) => filter.id === prevFilter.id)) {
            filterUpdates[prevFilter.id] = null
          }
        })

        // 필터가 바뀌면 첫 페이지로
        void setPage(1)
        debouncedSetFilterValues(filterUpdates)
        return next
      })
    },
    [
      debouncedSetFilterValues,
      enableAdvancedFilter,
      filterableColumns,
      searchableColumns,
      setPage,
    ]
  )

  // -------- TanStack Table 인스턴스 생성 --------
  const table = useReactTable({
    ...props,
    initialState,
    pageCount,
    state: {
      pagination,
      sorting,
      columnVisibility,
      rowSelection,
      columnFilters: enableAdvancedFilter ? [] : columnFilters,
      grouping,
      expanded,
    },

    // 콜백들
    onRowSelectionChange: setRowSelection,
    onPaginationChange,
    onSortingChange,
    onColumnFiltersChange,
    onColumnVisibilityChange: setColumnVisibility,
    onGroupingChange,
    onExpandedChange,

    // 기본 모델
    getCoreRowModel: getCoreRowModel(),
    // 필터 (Advanced 모드 아니면 사용)
    getFilteredRowModel: enableAdvancedFilter ? undefined : getFilteredRowModel(),
    getPaginationRowModel: getPaginationRowModel(),
    getSortedRowModel: getSortedRowModel(),
    // 그룹 + 확장
    getGroupedRowModel: getGroupedRowModel(),
    getExpandedRowModel: getExpandedRowModel(),

    // Faceted (Facet 필터용)
    getFacetedRowModel: enableAdvancedFilter ? undefined : getFacetedRowModel(),
    getFacetedUniqueValues: enableAdvancedFilter
      ? undefined
      : getFacetedUniqueValues(),

    // 서버 사이드 사용
    manualPagination: true,
    manualSorting: true,
    manualFiltering: true,
    // 그룹핑도 서버에서 처리한다면 별도 로직이 필요하지만,
    // TanStack Table v8에는 manualGrouping 옵션은 없음
    // (그룹핑을 서버에서 이미 해서 내려받는다면 row 구조 처리 필요)
    
  })

  return { table }
}