import { useEffect, useRef, useState } from 'react'
import QRect from '@/components/fabric/QRect'
import QPolygon from '@/components/fabric/QPolygon'
import {
  getStartIndex,
  rearrangeArray,
  findTopTwoIndexesByDistance,
} from '@/util/canvas-util'
import { useRecoilState } from 'recoil'
import { fontSizeState, sortedPolygonArray } from '@/store/canvasAtom'
import { QLine } from '@/components/fabric/QLine'

export const Mode = {
  DRAW_LINE: 'drawLine', // 기준선 긋기모드
  EDIT: 'edit',
  TEMPLATE: 'template',
  TEXTBOX: 'textbox',
  DRAW_RECT: 'drawRect',
  DEFAULT: 'default',
}

export function useMode() {
  const [mode, setMode] = useState()
  const points = useRef([])
  const historyPoints = useRef([])
  const historyLines = useRef([])
  const [canvas, setCanvas] = useState(null)
  const [zoom, setZoom] = useState(100)
  const [fontSize] = useRecoilState(fontSizeState)
  const [shape, setShape] = useState(0)
  const [sortedArray, setSortedArray] = useRecoilState(sortedPolygonArray)

  const addEvent = (mode) => {
    switch (mode) {
      case 'default':
        canvas?.off('mouse:down')
        break
      case 'drawLine':
        drawLineMode()
        break
      case 'edit':
        editMode()
        break
      case 'template':
        templateMode()
        break
      case 'textbox':
        textboxMode()
        break
      case 'drawRect':
        drawRectMode()
        break
    }
  }

  const changeMode = (canvas, mode) => {
    setMode(mode)
    // mode변경 시 이전 이벤트 제거
    setCanvas(canvas)
    canvas?.off('mouse:down')
    addEvent(mode)
  }

  const editMode = () => {
    canvas?.on('mouse:down', function (options) {
      const pointer = canvas?.getPointer(options.e)
      const circle = new fabric.Circle({
        radius: 1,
        fill: 'transparent', // 원 안을 비웁니다.
        stroke: 'black', // 원 테두리 색상을 검은색으로 설정합니다.
        left: pointer.x,
        top: pointer.y,
        originX: 'center',
        originY: 'center',
        selectable: false,
      })

      historyPoints.current.push(circle)
      points.current.push(circle)
      canvas?.add(circle)

      if (points.current.length === 2) {
        const length = Number(prompt('길이를 입력하세요:'))
        // length 값이 숫자가 아닌 경우
        if (isNaN(length) || length === 0) {
          //마지막 추가 된 points 제거합니다.

          const lastPoint =
            historyPoints.current[historyPoints.current.length - 1]

          canvas?.remove(lastPoint)

          historyPoints.current.pop()
          points.current.pop()
          return
        }

        if (length) {
          const vector = {
            x: points.current[1].left - points.current[0].left,
            y: points.current[1].top - points.current[0].top,
          }
          const slope = Math.abs(vector.y / vector.x) // 기울기 계산

          let scaledVector
          if (slope >= 1) {
            // 기울기가 1 이상이면 x축 방향으로 그림
            scaledVector = {
              x: 0,
              y: vector.y >= 0 ? Number(length) : -Number(length),
            }
          } else {
            // 기울기가 1 미만이면 y축 방향으로 그림
            scaledVector = {
              x: vector.x >= 0 ? Number(length) : -Number(length),
              y: 0,
            }
          }

          const line = new QLine(
            [
              points.current[0].left,
              points.current[0].top,
              points.current[0].left + scaledVector.x,
              points.current[0].top + scaledVector.y,
            ],
            {
              stroke: 'black',
              strokeWidth: 2,
              selectable: false,
              viewLengthText: true,
              direction: getDirection(points.current[0], points.current[1]),
              fontSize: fontSize,
            },
          )

          pushHistoryLine(line)

          // 라인의 끝에 점을 추가합니다.
          const endPointCircle = new fabric.Circle({
            radius: 1,
            fill: 'transparent', // 원 안을 비웁니다.
            stroke: 'black', // 원 테두리 색상을 검은색으로 설정합니다.
            left: points.current[0].left + scaledVector.x,
            top: points.current[0].top + scaledVector.y,
            originX: 'center',
            originY: 'center',
            selectable: false,
          })

          canvas?.add(endPointCircle)

          historyPoints.current.push(endPointCircle)

          points.current.forEach((point) => {
            canvas?.remove(point)
          })
          points.current = [endPointCircle]
        }
      }

      canvas?.renderAll()
    })
  }

  const pushHistoryLine = (line) => {
    if (
      historyLines.current.length > 0 &&
      historyLines.current[historyLines.current.length - 1].direction ===
        line.direction
    ) {
      // 같은 방향의 선이 두 번 연속으로 그려지면 이전 선을 제거하고, 새로운 선과 merge한다.

      const lastLine = historyLines.current.pop()
      canvas?.remove(lastLine)

      const mergedLine = new QLine(
        [lastLine.x1, lastLine.y1, line.x2, line.y2],
        {
          stroke: 'black',
          strokeWidth: 2,
          selectable: false,
          viewLengthText: true,
          direction: lastLine.direction,
          fontSize: fontSize,
        },
      )
      historyLines.current.push(mergedLine)
      canvas?.add(mergedLine)
    } else {
      historyLines.current.push(line)
      canvas?.add(line)
    }
  }

  const templateMode = () => {
    changeMode(canvas, Mode.EDIT)

    if (historyPoints.current.length >= 4) {
      const firstPoint = historyPoints.current[0]
      const lastPoint = historyPoints.current[historyPoints.current.length - 1]
      historyPoints.current.forEach((point) => {
        canvas?.remove(point)
      })
      drawLineWithLength(lastPoint, firstPoint)
      points.current = []
      historyPoints.current = []

      // handleOuterlines()
      handleOuterlinesTest() //외곽선 그리기 테스트

      makePolygon()
    }
  }

  const textboxMode = () => {
    canvas?.on('mouse:down', function (options) {
      if (canvas?.getActiveObject()?.type === 'textbox') return
      const pointer = canvas?.getPointer(options.e)

      const textbox = new fabric.Textbox('텍스트를 입력하세요', {
        left: pointer.x,
        top: pointer.y,
        width: 150, // 텍스트박스의 너비를 설정합니다.
        fontSize: fontSize, // 텍스트의 크기를 설정합니다.
      })

      canvas?.add(textbox)
      canvas?.setActiveObject(textbox) // 생성된 텍스트박스를 활성 객체로 설정합니다.
      canvas?.renderAll()
      // textbox가 active가 풀린 경우 editing mode로 변경
      textbox?.on('editing:exited', function () {
        changeMode(canvas, Mode.EDIT)
      })
    })
  }

  const drawLineMode = () => {
    canvas?.on('mouse:down', function (options) {
      const pointer = canvas?.getPointer(options.e)

      const line = new QLine(
        [pointer.x, 0, pointer.x, canvas.height], // y축에 1자 선을 그립니다.
        {
          stroke: 'black',
          strokeWidth: 2,
          viewLengthText: true,
          selectable: false,
          fontSize: fontSize,
        },
      )

      canvas?.add(line)
      canvas?.renderAll()
    })
  }

  const drawRectMode = () => {
    let rect, isDown, origX, origY
    canvas.on('mouse:down', function (o) {
      isDown = true
      const pointer = canvas.getPointer(o.e)
      origX = pointer.x
      origY = pointer.y
      rect = new fabric.Rect({
        left: origX,
        top: origY,
        originX: 'left',
        originY: 'top',
        width: pointer.x - origX,
        height: pointer.y - origY,
        angle: 0,
        fill: 'transparent',
        stroke: 'black',
        transparentCorners: false,
      })
      canvas.add(rect)
    })

    canvas.on('mouse:move', function (o) {
      if (!isDown) return
      const pointer = canvas.getPointer(o.e)
      if (origX > pointer.x) {
        rect.set({ left: Math.abs(pointer.x) })
      }
      if (origY > pointer.y) {
        rect.set({ top: Math.abs(pointer.y) })
      }

      rect.set({ width: Math.abs(origX - pointer.x) })
      rect.set({ height: Math.abs(origY - pointer.y) })
    })

    canvas.on('mouse:up', function (o) {
      const pointer = canvas.getPointer(o.e)
      const qRect = new QRect({
        left: origX,
        top: origY,
        originX: 'left',
        originY: 'top',
        width: pointer.x - origX,
        height: pointer.y - origY,
        angle: 0,
        viewLengthText: true,
        fill: 'transparent',
        stroke: 'black',
        transparentCorners: false,
        fontSize: fontSize,
      })
      canvas.remove(rect)
      canvas.add(qRect)
      isDown = false
    })
  }

  /**
   * 두 점 사이의 방향을 반환합니다.
   */
  const getDirection = (a, b) => {
    const vector = {
      x: b.left - a.left,
      y: b.top - a.top,
    }

    if (Math.abs(vector.x) > Math.abs(vector.y)) {
      // x축 방향으로 더 많이 이동
      return vector.x > 0 ? 'right' : 'left'
    } else {
      // y축 방향으로 더 많이 이동
      return vector.y > 0 ? 'bottom' : 'top'
    }
  }

  /**
   * 두 점을 연결하는 선과 길이를 그립니다.
   * a : 시작점, b : 끝점
   */
  const drawLineWithLength = (a, b) => {
    const vector = {
      x: b.left - a.left,
      y: b.top - a.top,
    }
    const line = new QLine([a.left, a.top, b.left, b.top], {
      stroke: 'black',
      strokeWidth: 2,
      selectable: false,
      viewLengthText: true,
      direction: getDirection(a, b),
      fontSize: fontSize,
    })
    pushHistoryLine(line)

    canvas?.renderAll()
  }

  const makePolygon = (otherLines) => {
    // 캔버스에서 모든 라인 객체를 찾습니다.
    const lines = otherLines || historyLines.current

    if (!otherLines) {
      //외각선 기준
      const sortedIndex = getStartIndex(lines)
      let tmpArraySorted = rearrangeArray(lines, sortedIndex)

      if (tmpArraySorted[0].direction === 'right') {
        //시계방향
        tmpArraySorted = tmpArraySorted.reverse() //그럼 배열을 거꾸로 만들어서 무조건 반시계방향으로 배열 보정
      }

      setSortedArray(tmpArraySorted) //recoil에 넣음
      const topIndex = findTopTwoIndexesByDistance(tmpArraySorted) //배열중에 큰 2값을 가져옴 TODO: 나중에는 인자로 받아서 다각으로 수정 해야됨

      //일단 배열 6개 짜리 기준의 선 번호
      if (topIndex[0] === 4) {
        if (topIndex[1] === 5) {
          //1번
          setShape(1)
        }
      } else if (topIndex[0] === 1) {
        //4번
        if (topIndex[1] === 2) {
          setShape(4)
        }
      } else if (topIndex[0] === 0) {
        if (topIndex[1] === 1) {
          //2번
          setShape(2)
        } else if (topIndex[1] === 5) {
          setShape(3)
        }
      }

      historyLines.current = []
    }

    // 각 라인의 시작점과 끝점을 사용하여 다각형의 점 배열을 생성합니다.
    const points = lines.map((line) => ({ x: line.x1, y: line.y1 }))

    // 모든 라인 객체를 캔버스에서 제거합니다.
    lines.forEach((line) => {
      canvas?.remove(line)
    })

    // 점 배열을 사용하여 새로운 다각형 객체를 생성합니다.
    const polygon = new QPolygon(
      points,
      {
        stroke: 'black',
        fill: 'transparent',
        viewLengthText: true,
        selectable: true,
        fontSize: fontSize,
      },
      canvas,
    )

    // 새로운 다각형 객체를 캔버스에 추가합니다.
    canvas.add(polygon)

    // 캔버스를 다시 그립니다.
    if (!otherLines) {
      polygon.fillCell()
      canvas.renderAll()
      polygon.setViewLengthText(false)
      setMode(Mode.DEFAULT)
    }
  }

  /**
   * 해당 캔버스를 비운다.
   */
  const handleClear = () => {
    canvas?.clear()
    points.current = []
    historyPoints.current = []
    historyLines.current = []
  }

  const zoomIn = () => {
    canvas?.setZoom(canvas.getZoom() + 0.1)
    setZoom(Math.round(zoom + 10))
  }

  const zoomOut = () => {
    canvas?.setZoom(canvas.getZoom() - 0.1)
    setZoom(Math.ceil(zoom - 10))
  }

  const handleOuterlines = () => {
    const newOuterlines = []
    for (let i = 0; i < historyLines.current.length; i++) {
      const next = historyLines.current[i + 1]
      const prev =
        historyLines.current[i - 1] ??
        historyLines.current[historyLines.current.length - 1]
      if (next) {
        if (next.direction === 'right') {
          // 다름 라인이 오른쪽으로 이동
          if (historyLines.current[i].direction === 'top') {
            if (prev.direction !== 'right') {
              if (historyLines.current.length === 4) {
                newOuterlines.push({
                  x1: historyLines.current[i].x1 - 50,
                  y1: historyLines.current[i].y1 + 50,
                  x2: historyLines.current[i].x2 - 50,
                  y2: historyLines.current[i].y2 - 50,
                })
              } else if (historyLines.current.length === 6) {
                newOuterlines.push({
                  x1: historyLines.current[i].x1 - 50,
                  y1: historyLines.current[i].y1 + 50,
                  x2: historyLines.current[i].x2 - 50,
                  y2: historyLines.current[i].y2 - 50,
                })
              } else if (historyLines.current.length === 8) {
                newOuterlines.push({
                  x1: historyLines.current[i].x1 + 50,
                  y1: historyLines.current[i].y1 - 50,
                  x2: historyLines.current[i].x2 + 50,
                  y2: historyLines.current[i].y2 + 50,
                })
              }
            } else {
              newOuterlines.push({
                x1: historyLines.current[i].x1 + 50,
                y1: historyLines.current[i].y1 + 50,
                x2: historyLines.current[i].x2 + 50,
                y2: historyLines.current[i].y2 + 50,
              })
            }
          } else {
            // bottom
            if (prev?.direction !== 'right') {
              if (historyLines.current.length === 4) {
                newOuterlines.push({
                  x1: historyLines.current[i].x1 - 50,
                  y1: historyLines.current[i].y1 - 50,
                  x2: historyLines.current[i].x2 - 50,
                  y2: historyLines.current[i].y2 + 50,
                })
              } else if (historyLines.current.length === 6) {
                newOuterlines.push({
                  x1: historyLines.current[i].x1 - 50,
                  y1: historyLines.current[i].y1 - 50,
                  x2: historyLines.current[i].x2 - 50,
                  y2: historyLines.current[i].y2 + 50,
                })
              } else if (historyLines.current.length === 8) {
                newOuterlines.push({
                  x1: historyLines.current[i].x1 + 50,
                  y1: historyLines.current[i].y1 + 50,
                  x2: historyLines.current[i].x2 + 50,
                  y2: historyLines.current[i].y2 - 50,
                })
              }
            } else {
              newOuterlines.push({
                x1: historyLines.current[i].x1 - 50,
                y1: historyLines.current[i].y1 + 50,
                x2: historyLines.current[i].x2 - 50,
                y2: historyLines.current[i].y2 + 50,
              })
            }
          }
        } else if (next.direction === 'left') {
          if (historyLines.current[i].direction === 'top') {
            if (prev?.direction !== 'left') {
              if (historyLines.current.length === 4) {
                newOuterlines.push({
                  x1: historyLines.current[i].x1 + 50,
                  y1: historyLines.current[i].y1 + 50,
                  x2: historyLines.current[i].x2 + 50,
                  y2: historyLines.current[i].y2 - 50,
                })
              } else if (historyLines.current.length === 6) {
                newOuterlines.push({
                  x1: historyLines.current[i].x1 + 50,
                  y1: historyLines.current[i].y1 + 50,
                  x2: historyLines.current[i].x2 + 50,
                  y2: historyLines.current[i].y2 - 50,
                })
              } else if (historyLines.current.length === 8) {
                newOuterlines.push({
                  x1: historyLines.current[i].x1 - 50,
                  y1: historyLines.current[i].y1 - 50,
                  x2: historyLines.current[i].x2 - 50,
                  y2: historyLines.current[i].y2 + 50,
                })
              }
            } else {
              newOuterlines.push({
                x1: historyLines.current[i].x1 + 50,
                y1: historyLines.current[i].y1 - 50,
                x2: historyLines.current[i].x2 + 50,
                y2: historyLines.current[i].y2 - 50,
              })
            }
          } else {
            // bottom
            if (prev?.direction !== 'left') {
              if (historyLines.current.length === 4) {
                newOuterlines.push({
                  x1: historyLines.current[i].x1 + 50,
                  y1: historyLines.current[i].y1 - 50,
                  x2: historyLines.current[i].x2 + 50,
                  y2: historyLines.current[i].y2 + 50,
                })
              } else if (historyLines.current.length === 6) {
                newOuterlines.push({
                  x1: historyLines.current[i].x1 + 50,
                  y1: historyLines.current[i].y1 - 50,
                  x2: historyLines.current[i].x2 + 50,
                  y2: historyLines.current[i].y2 + 50,
                })
              } else if (historyLines.current.length === 8) {
                newOuterlines.push({
                  x1: historyLines.current[i].x1 - 50,
                  y1: historyLines.current[i].y1 + 50,
                  x2: historyLines.current[i].x2 - 50,
                  y2: historyLines.current[i].y2 - 50,
                })
              }
            } else {
              newOuterlines.push({
                x1: historyLines.current[i].x1 - 50,
                y1: historyLines.current[i].y1 - 50,
                x2: historyLines.current[i].x2 - 50,
                y2: historyLines.current[i].y2 - 50,
              })
            }
          }
        } else if (next.direction === 'top') {
          if (historyLines.current[i].direction === 'right') {
            if (prev?.direction !== 'top') {
              if (historyLines.current.length === 4) {
                newOuterlines.push({
                  x1: historyLines.current[i].x1 - 50,
                  y1: historyLines.current[i].y1 + 50,
                  x2: historyLines.current[i].x2 + 50,
                  y2: historyLines.current[i].y2 + 50,
                })
              } else if (historyLines.current.length === 6) {
                newOuterlines.push({
                  x1: historyLines.current[i].x1 - 50,
                  y1: historyLines.current[i].y1 + 50,
                  x2: historyLines.current[i].x2 + 50,
                  y2: historyLines.current[i].y2 + 50,
                })
              } else if (historyLines.current.length === 8) {
                newOuterlines.push({
                  x1: historyLines.current[i].x1 + 50,
                  y1: historyLines.current[i].y1 - 50,
                  x2: historyLines.current[i].x2 - 50,
                  y2: historyLines.current[i].y2 - 50,
                })
              }
            } else {
              newOuterlines.push({
                x1: historyLines.current[i].x1 + 50,
                y1: historyLines.current[i].y1 + 50,
                x2: historyLines.current[i].x2 + 50,
                y2: historyLines.current[i].y2 + 50,
              })
            }
          } else {
            // left
            if (prev?.direction !== 'top') {
              if (historyLines.current.length === 4) {
                newOuterlines.push({
                  x1: historyLines.current[i].x1 + 50,
                  y1: historyLines.current[i].y1 + 50,
                  x2: historyLines.current[i].x2 - 50,
                  y2: historyLines.current[i].y2 + 50,
                })
              } else if (historyLines.current.length === 6) {
                newOuterlines.push({
                  x1: historyLines.current[i].x1 + 50,
                  y1: historyLines.current[i].y1 + 50,
                  x2: historyLines.current[i].x2 - 50,
                  y2: historyLines.current[i].y2 + 50,
                })
              } else if (historyLines.current.length === 8) {
                newOuterlines.push({
                  x1: historyLines.current[i].x1 - 50,
                  y1: historyLines.current[i].y1 - 50,
                  x2: historyLines.current[i].x2 + 50,
                  y2: historyLines.current[i].y2 - 50,
                })
              }
            } else {
              newOuterlines.push({
                x1: historyLines.current[i].x1 + 50,
                y1: historyLines.current[i].y1 - 50,
                x2: historyLines.current[i].x2 + 50,
                y2: historyLines.current[i].y2 - 50,
              })
            }
          }
        } else if (next.direction === 'bottom') {
          if (historyLines.current[i].direction === 'right') {
            if (prev?.direction !== 'bottom') {
              if (historyLines.current.length === 4) {
                newOuterlines.push({
                  x1: historyLines.current[i].x1 - 50,
                  y1: historyLines.current[i].y1 - 50,
                  x2: historyLines.current[i].x2 + 50,
                  y2: historyLines.current[i].y2 - 50,
                })
              } else if (historyLines.current.length === 6) {
                newOuterlines.push({
                  x1: historyLines.current[i].x1 - 50,
                  y1: historyLines.current[i].y1 - 50,
                  x2: historyLines.current[i].x2 + 50,
                  y2: historyLines.current[i].y2 - 50,
                })
              } else if (historyLines.current.length === 8) {
                newOuterlines.push({
                  x1: historyLines.current[i].x1 + 50,
                  y1: historyLines.current[i].y1 + 50,
                  x2: historyLines.current[i].x2 - 50,
                  y2: historyLines.current[i].y2 + 50,
                })
              }
            } else {
              newOuterlines.push({
                x1: historyLines.current[i].x1 - 50,
                y1: historyLines.current[i].y1 + 50,
                x2: historyLines.current[i].x2 - 50,
                y2: historyLines.current[i].y2 + 50,
              })
            }
          } else {
            // left
            if (prev.direction !== 'bottom') {
              if (historyLines.current.length === 4) {
                newOuterlines.push({
                  x1: historyLines.current[i].x1 + 50,
                  y1: historyLines.current[i].y1 - 50,
                  x2: historyLines.current[i].x2 - 50,
                  y2: historyLines.current[i].y2 - 50,
                })
              } else if (historyLines.current.length === 6) {
                newOuterlines.push({
                  x1: historyLines.current[i].x1 + 50,
                  y1: historyLines.current[i].y1 - 50,
                  x2: historyLines.current[i].x2 - 50,
                  y2: historyLines.current[i].y2 - 50,
                })
              } else if (historyLines.current.length === 8) {
                newOuterlines.push({
                  x1: historyLines.current[i].x1 - 50,
                  y1: historyLines.current[i].y1 + 50,
                  x2: historyLines.current[i].x2 + 50,
                  y2: historyLines.current[i].y2 + 50,
                })
              }
            } else {
              newOuterlines.push({
                x1: historyLines.current[i].x1 - 50,
                y1: historyLines.current[i].y1 - 50,
                x2: historyLines.current[i].x2 + 50,
                y2: historyLines.current[i].y2 - 50,
              })
            }
          }
        }
      } else {
        const tmp = newOuterlines[newOuterlines.length - 1]
        newOuterlines.push({
          x1: tmp.x2,
          y1: tmp.y2,
          x2: newOuterlines[0].x1,
          y2: newOuterlines[0].y1,
        })
      }
    }

    console.log(newOuterlines)
    makePolygon(newOuterlines)
  }

  const handleOuterlinesTest = () => {
    var offsetPoints = []
    let offset = 71 // == 100 - 29

    const sortedIndex = getStartIndex(historyLines.current)
    let tmpArraySorted = rearrangeArray(historyLines.current, sortedIndex)

    if (tmpArraySorted[0].direction === 'right') {
      //시계방향
      tmpArraySorted = tmpArraySorted.reverse() //그럼 배열을 거꾸로 만들어서 무조건 반시계방향으로 배열 보정
    }

    const points = tmpArraySorted.map((line) => ({
      x: line.x1,
      y: line.y1,
    }))

    for (var i = 0; i < points.length; i++) {
      var prev = points[(i - 1 + points.length) % points.length]
      var current = points[i]
      var next = points[(i + 1) % points.length]

      // 두 벡터 계산 (prev -> current, current -> next)
      var vector1 = { x: current.x - prev.x, y: current.y - prev.y }
      var vector2 = { x: next.x - current.x, y: next.y - current.y }

      // 벡터의 길이 계산
      var length1 = Math.sqrt(vector1.x * vector1.x + vector1.y * vector1.y)
      var length2 = Math.sqrt(vector2.x * vector2.x + vector2.y * vector2.y)

      // 벡터를 단위 벡터로 정규화
      var unitVector1 = { x: vector1.x / length1, y: vector1.y / length1 }
      var unitVector2 = { x: vector2.x / length2, y: vector2.y / length2 }

      // 법선 벡터 계산 (왼쪽 방향)
      var normal1 = { x: -unitVector1.y, y: unitVector1.x }
      var normal2 = { x: -unitVector2.y, y: unitVector2.x }

      // 법선 벡터 평균 계산
      var averageNormal = {
        x: (normal1.x + normal2.x) / 2,
        y: (normal1.y + normal2.y) / 2,
      }

      // 평균 법선 벡터를 단위 벡터로 정규화
      var lengthNormal = Math.sqrt(
        averageNormal.x * averageNormal.x + averageNormal.y * averageNormal.y,
      )
      var unitNormal = {
        x: averageNormal.x / lengthNormal,
        y: averageNormal.y / lengthNormal,
      }

      // 오프셋 적용
      var offsetPoint = {
        x1: current.x + unitNormal.x * offset,
        y1: current.y + unitNormal.y * offset,
      }

      offsetPoints.push(offsetPoint)
    }
    
    makePolygon(offsetPoints)
  }

  const togglePolygonLine = (obj) => {
    const rtnLines = []
    if (obj.type === 'QPolygon') {
      const points = obj.getCurrentPoints()
      points.forEach((point, index) => {
        const nextPoint = points[(index + 1) % points.length] // 마지막 점이면 첫 번째 점으로 연결
        const line = new QLine([point.x, point.y, nextPoint.x, nextPoint.y], {
          stroke: 'black',
          strokeWidth: 2,
          selectable: false,
          fontSize: fontSize, // fontSize는 필요에 따라 조정
          parent: obj,
        })
        obj.visible = false
        canvas.add(line)
        rtnLines.push(line)
      })

      canvas.renderAll()
    }
    if (obj.type === 'QLine') {
      const parent = obj.parent
      canvas
        ?.getObjects()
        .filter((obj) => obj.parent === parent)
        .forEach((obj) => {
          rtnLines.push(obj)
          canvas.remove(obj)
        })

      parent.visible = true
      canvas.renderAll()
    }
    return rtnLines
  }

  return {
    mode,
    changeMode,
    setCanvas,
    handleClear,
    zoomIn,
    zoomOut,
    zoom,
    togglePolygonLine,
  }
}