"use client"

import * as React from "react"
import { type DataTableRowAction } from "@/types/table"
import { type ColumnDef } from "@tanstack/react-table"
import { Eye } from "lucide-react"

import { formatDate } from "@/lib/utils"
import { Button } from "@/components/ui/button"

import { DataTableColumnHeaderSimple } from "@/components/data-table/data-table-column-simple-header"
import { Project } from "@/db/schema"
import { projectsColumnsConfig } from "@/config/projectsColumnsConfig"

interface GetColumnsProps {
  setRowAction: React.Dispatch<React.SetStateAction<DataTableRowAction<Project> | null>>
  onDetailClick: (project: Project) => void
}

/**
 * tanstack table 컬럼 정의 (중첩 헤더 버전)
 */
// eslint-disable-next-line @typescript-eslint/no-unused-vars
export function getColumns({ setRowAction, onDetailClick }: GetColumnsProps): ColumnDef<Project>[] {
  // 상세보기 버튼 컬럼
  const detailColumn: ColumnDef<Project> = {
    id: "action",
    header: "상세보기",
    size: 100,
    cell: ({ row }) => {
      const project = row.original

      return (
        <Button
          variant="ghost"
          size="sm"
          onClick={() => onDetailClick(project)}
          className="h-8 w-8 p-0"
        >
          <Eye className="h-4 w-4" />
          <span className="sr-only">상세보기</span>
        </Button>
      )
    },
  }

  // ----------------------------------------------------------------
  // 3) 일반 컬럼들을 "그룹"별로 묶어 중첩 columns 생성
  // ----------------------------------------------------------------
  // 3-1) groupMap: { [groupName]: ColumnDef<Project>[] }
  const groupMap: Record<string, ColumnDef<Project>[]> = {}

  projectsColumnsConfig.forEach((cfg) => {
    // 만약 group가 없으면 "_noGroup" 처리
    const groupName = cfg.group || "_noGroup"

    if (!groupMap[groupName]) {
      groupMap[groupName] = []
    }

    // child column 정의
    const childCol: ColumnDef<Project> = {
      accessorKey: cfg.id,
      enableResizing: true,
      header: ({ column }) => (
        <DataTableColumnHeaderSimple column={column} title={cfg.label} />
      ),
      meta: {
        excelHeader: cfg.excelHeader,
        group: cfg.group,
        type: cfg.type,
      },
      cell: ({ row, cell }) => {
 
        if (cfg.id === "createdAt"||cfg.id === "updatedAt") {
          const dateVal = cell.getValue() as Date
          return formatDate(dateVal, "KR")
        }

        return row.getValue(cfg.id) ?? ""
      },
    }

    groupMap[groupName].push(childCol)
  })

  // ----------------------------------------------------------------
  // 3-2) groupMap에서 실제 상위 컬럼(그룹)을 만들기
  // ----------------------------------------------------------------
  const nestedColumns: ColumnDef<Project>[] = []

  // 순서를 고정하고 싶다면 group 순서를 미리 정의하거나 sort해야 함
  // 여기서는 그냥 Object.entries 순서
  Object.entries(groupMap).forEach(([groupName, colDefs]) => {
    if (groupName === "_noGroup") {
      // 그룹 없음 → 그냥 최상위 레벨 컬럼
      nestedColumns.push(...colDefs)
    } else {
      // 상위 컬럼
      nestedColumns.push({
        id: groupName,
        header: groupName, // "Basic Info", "Metadata" 등
        columns: colDefs,
      })
    }
  })

  // ----------------------------------------------------------------
  // 4) 최종 컬럼 배열: detailColumn, nestedColumns
  // ----------------------------------------------------------------
  return [
    detailColumn,
    ...nestedColumns,
  ]
}