import { useEffect, useRef, useState } from 'react'
import { useRecoilState, useRecoilValue, useSetRecoilState } from 'recoil'
import {
  adsorptionPointAddModeState,
  adsorptionPointModeState,
  adsorptionRangeState,
  canvasState,
  dotLineIntervalSelector,
  verticalHorizontalModeState,
} from '@/store/canvasAtom'
import { useEvent } from '@/hooks/useEvent'
import { useMouse } from '@/hooks/useMouse'
import { useLine } from '@/hooks/useLine'
import { useTempGrid } from '@/hooks/useTempGrid'
import {
  OUTER_LINE_TYPE,
  outerLineAngle1State,
  outerLineAngle2State,
  outerLineArrow1State,
  outerLineArrow2State,
  outerLineDiagonalState,
  outerLineLength1State,
  outerLineLength2State,
  outerLineTypeState,
} from '@/store/outerLineAtom'
import { calculateDistance, calculateIntersection, distanceBetweenPoints, findClosestPoint, polygonToTurfPolygon } from '@/util/canvas-util'
import { fabric } from 'fabric'
import { useAdsorptionPoint } from '@/hooks/useAdsorptionPoint'
import { useSwal } from '@/hooks/useSwal'
import { booleanPointInPolygon } from '@turf/turf'

// 보조선 작성
export function useAuxiliaryDrawing(setShowAuxiliaryModal) {
  const canvas = useRecoilValue(canvasState)
  const { addCanvasMouseEventListener, addDocumentEventListener, removeMouseLine, initEvent } = useEvent()
  const { getIntersectMousePoint } = useMouse()
  const { addLine, removeLine } = useLine()
  const { tempGridMode } = useTempGrid()
  const { swalFire } = useSwal()
  const { getAdsorptionPoints } = useAdsorptionPoint()

  const adsorptionRange = useRecoilValue(adsorptionRangeState)

  const [buttonAct, setButtonAct] = useState(1)

  const mousePointerArr = useRef([])
  const roofAdsorptionPoints = useRef([])
  const lineHistory = useRef([])

  const length1Ref = useRef(0)
  const length2Ref = useRef(0)
  const angle1Ref = useRef('')
  const angle2Ref = useRef('')
  const [length1, setLength1] = useRecoilState(outerLineLength1State)
  const [length2, setLength2] = useRecoilState(outerLineLength2State)
  const [arrow1, setArrow1] = useRecoilState(outerLineArrow1State)
  const [arrow2, setArrow2] = useRecoilState(outerLineArrow2State)
  const [type, setType] = useRecoilState(outerLineTypeState)
  const [angle1, setAngle1] = useRecoilState(outerLineAngle1State)
  const [angle2, setAngle2] = useRecoilState(outerLineAngle2State)
  const [outerLineDiagonalLength, setOuterLineDiagonalLength] = useRecoilState(outerLineDiagonalState)
  const arrow1Ref = useRef(arrow1)
  const arrow2Ref = useRef(arrow2)

  const typeRef = useRef(type)

  const outerLineDiagonalLengthRef = useRef(0)
  const intersectionPoints = useRef([])

  useEffect(() => {
    arrow1Ref.current = arrow1
  }, [arrow1])

  useEffect(() => {
    arrow2Ref.current = arrow2
  }, [arrow2])

  useEffect(() => {
    typeRef.current = type
    clear()
    addDocumentEventListener('keydown', document, keydown[type])
  }, [type])

  useEffect(() => {
    // innerLines가 있을경우 삭제
    const roofs = canvas?.getObjects().filter((obj) => obj.name === 'roofBase')
    if (roofs.length === 0) {
      swalFire({ text: '지붕형상이 없습니다.' })
      setShowAuxiliaryModal(false)
      return
    }

    // 지붕의 각 꼭지점을 흡착점으로 설정
    const roofsPoints = roofs.map((roof) => roof.points).flat()
    roofAdsorptionPoints.current = [...roofsPoints]

    addCanvasMouseEventListener('mouse:move', mouseMove)
    addCanvasMouseEventListener('mouse:down', mouseDown)
    addDocumentEventListener('contextmenu', document, cutAuxiliary)
    addDocumentEventListener('keydown', document, keydown[type])

    return () => {
      canvas.remove(...canvas.getObjects().filter((obj) => obj.name === 'innerPoint'))
      initEvent()
      canvas.renderAll()
    }
  }, [])

  const clear = () => {
    addCanvasMouseEventListener('mouse:move', mouseMove)
    setLength1(0)
    setLength2(0)

    setArrow1('')
    setArrow2('')

    setAngle1(0)
    setAngle2(0)

    setOuterLineDiagonalLength(0)
  }

  const keydown = {
    outerLine: (e) => {
      if (mousePointerArr.current.length === 0) {
        return
      }
      // 포커스가 length1에 있지 않으면 length1에 포커스를 줌
      const activeElem = document.activeElement
      if (activeElem !== length1Ref.current) {
        length1Ref.current.focus()
      }

      const key = e.key

      if (!length1Ref.current) {
        return
      }

      const lengthNum = Number(length1Ref.current.value) / 10
      if (lengthNum === 0) {
        return
      }
      const lastPoint = mousePointerArr.current[0]
      switch (key) {
        case 'Down': // IE/Edge에서 사용되는 값
        case 'ArrowDown': {
          setArrow1('↓')
          mousePointerArr.current.push({ x: lastPoint.x, y: lastPoint.y + lengthNum })
          drawLine()
          break
        }
        case 'Up': // IE/Edge에서 사용되는 값
        case 'ArrowUp':
          setArrow1('↑')
          mousePointerArr.current.push({ x: lastPoint.x, y: lastPoint.y - lengthNum })
          drawLine()
          break
        case 'Left': // IE/Edge에서 사용되는 값
        case 'ArrowLeft':
          setArrow1('←')
          mousePointerArr.current.push({ x: lastPoint.x - lengthNum, y: lastPoint.y })
          drawLine()
          break
        case 'Right': // IE/Edge에서 사용되는 값
        case 'ArrowRight':
          setArrow1('→')
          mousePointerArr.current.push({ x: lastPoint.x + lengthNum, y: lastPoint.y })
          drawLine()
          break
      }
    },
    rightAngle: (e) => {
      if (mousePointerArr.current.length === 0) {
        return
      }
      const key = e.key

      const activeElem = document.activeElement
      if (activeElem !== length1Ref.current && activeElem !== length2Ref.current) {
        length1Ref.current.focus()
      }

      switch (key) {
        case 'Down': // IE/Edge에서 사용되는 값
        case 'ArrowDown': {
          checkRightAngle('↓')
          break
        }
        case 'Up': // IE/Edge에서 사용되는 값
        case 'ArrowUp':
          checkRightAngle('↑')
          break
        case 'Left': // IE/Edge에서 사용되는 값
        case 'ArrowLeft':
          checkRightAngle('←')
          break
        case 'Right': // IE/Edge에서 사용되는 값
        case 'ArrowRight':
          checkRightAngle('→')
          break
      }
    },
    doublePitch: (e) => {
      if (mousePointerArr.current.length === 0) {
        return
      }
      const key = e.key
      switch (key) {
        case 'Down': // IE/Edge에서 사용되는 값
        case 'ArrowDown': {
          checkDoublePitch('↓')
          break
        }
        case 'Up': // IE/Edge에서 사용되는 값
        case 'ArrowUp':
          checkDoublePitch('↑')
          break
        case 'Left': // IE/Edge에서 사용되는 값
        case 'ArrowLeft':
          checkDoublePitch('←')
          break
        case 'Right': // IE/Edge에서 사용되는 값
        case 'ArrowRight':
          checkDoublePitch('→')
          break
      }
    },
    angle: (e) => {
      if (mousePointerArr.current.length === 0) {
        return
      }
      const key = e.key
      switch (key) {
        case 'Enter': {
          const lastPoint = mousePointerArr.current[0]
          const length = length1Ref.current.value / 10
          const angle = angle1Ref.current.value
          //lastPoint로부터 angle1만큼의 각도로 length1만큼의 길이를 가지는 선을 그림
          const radian = (angle * Math.PI) / 180

          const x = lastPoint.x + length * Math.cos(radian)
          const y = lastPoint.y - length * Math.sin(radian)
          return [...prev, { x, y }]
        }
      }
    },
    diagonalLine: (e) => {
      if (mousePointerArr.current.length === 0) {
        return
      }

      const key = e.key
      switch (key) {
        case 'Down': // IE/Edge에서 사용되는 값
        case 'ArrowDown': {
          checkDiagonal('↓')
          break
        }
        case 'Up': // IE/Edge에서 사용되는 값
        case 'ArrowUp':
          checkDiagonal('↑')
          break
        case 'Left': // IE/Edge에서 사용되는 값
        case 'ArrowLeft':
          checkDiagonal('←')
          break
        case 'Right': // IE/Edge에서 사용되는 값
        case 'ArrowRight':
          checkDiagonal('→')
          break
      }
    },
  }

  // 직각 완료될 경우 확인
  const checkRightAngle = (direction) => {
    const activeElem = document.activeElement

    const canDirection =
      direction === '↓' || direction === '↑'
        ? arrow1Ref.current === '←' || arrow1Ref.current === '→'
        : arrow1Ref.current === '↓' || arrow1Ref.current === '↑'

    if (activeElem === length1Ref.current || activeElem === angle1Ref.current) {
      setArrow1(direction)
      arrow1Ref.current = direction
      length2Ref.current.focus()
    } else if (activeElem === length2Ref.current || activeElem === angle2Ref.current) {
      if (!canDirection) {
        return
      }
      setArrow2(direction)
      arrow2Ref.current = direction
    }

    const length1Num = Number(length1Ref.current.value) / 10
    const length2Num = Number(length2Ref.current.value) / 10

    if (mousePointerArr.current.length === 0) {
      return
    }

    const lastPoint = mousePointerArr.current[0]

    if (length1Num === 0 || length2Num === 0 || arrow1Ref.current === '' || arrow2Ref.current === '') {
      return
    }

    if (arrow1Ref.current === '↓' && arrow2Ref.current === '→') {
      mousePointerArr.current.push({ x: lastPoint.x + length2Num, y: lastPoint.y + length1Num })
    } else if (arrow1Ref.current === '↓' && arrow2Ref.current === '←') {
      mousePointerArr.current.push({ x: lastPoint.x - length2Num, y: lastPoint.y + length1Num })
    } else if (arrow1Ref.current === '↑' && arrow2Ref.current === '→') {
      mousePointerArr.current.push({ x: lastPoint.x + length2Num, y: lastPoint.y - length1Num })
    } else if (arrow1Ref.current === '↑' && arrow2Ref.current === '←') {
      mousePointerArr.current.push({ x: lastPoint.x - length2Num, y: lastPoint.y - length1Num })
    } else if (arrow1Ref.current === '→' && arrow2Ref.current === '↓') {
      mousePointerArr.current.push({ x: lastPoint.x + length1Num, y: lastPoint.y + length2Num })
    } else if (arrow1Ref.current === '→' && arrow2Ref.current === '↑') {
      mousePointerArr.current.push({ x: lastPoint.x + length1Num, y: lastPoint.y - length2Num })
    } else if (arrow1Ref.current === '←' && arrow2Ref.current === '↓') {
      mousePointerArr.current.push({ x: lastPoint.x - length1Num, y: lastPoint.y + length2Num })
    } else if (arrow1Ref.current === '←' && arrow2Ref.current === '↑') {
      mousePointerArr.current.push({ x: lastPoint.x - length1Num, y: lastPoint.y - length2Num })
    }
    drawLine()
  }

  //이구배 완료될 경우 확인 ↓, ↑, ←, →
  const checkDoublePitch = (direction) => {
    const activeElem = document.activeElement

    const canDirection =
      direction === '↓' || direction === '↑'
        ? arrow1Ref.current === '←' || arrow1Ref.current === '→'
        : arrow1Ref.current === '↓' || arrow1Ref.current === '↑'

    if (activeElem === length1Ref.current || activeElem === angle1Ref.current) {
      setArrow1(direction)
      arrow1Ref.current = direction
      angle2Ref.current.focus()
    } else if (activeElem === length2Ref.current || activeElem === angle2Ref.current) {
      if (!canDirection) {
        return
      }
      setArrow2(direction)
      arrow2Ref.current = direction
    }

    const angle1Value = Number(angle1Ref.current.value)
    const angle2Value = Number(angle2Ref.current.value)
    const length1Value = Number(length1Ref.current.value)
    const length2Value = Number(length2Ref.current.value)

    const arrow1Value = arrow1Ref.current
    const arrow2Value = arrow2Ref.current
    const lastPoint = mousePointerArr.current[0]

    if (angle1Value !== 0 && length1Value !== 0 && angle2Value !== 0 && arrow1Value !== '' && arrow2Value !== '') {
      if (arrow1Value === '↓' && arrow2Value === '→') {
        mousePointerArr.current.push({ x: lastPoint.x + length1Value / 10, y: lastPoint.y + length2Value / 10 })
      } else if (arrow1Value === '↓' && arrow2Value === '←') {
        mousePointerArr.current.push({ x: lastPoint.x - length1Value / 10, y: lastPoint.y + length2Value / 10 })
      } else if (arrow1Value === '↑' && arrow2Value === '→') {
        mousePointerArr.current.push({ x: lastPoint.x + length1Value / 10, y: lastPoint.y - length2Value / 10 })
      } else if (arrow1Value === '↑' && arrow2Value === '←') {
        mousePointerArr.current.push({ x: lastPoint.x - length1Value / 10, y: lastPoint.y - length2Value / 10 })
      } else if (arrow1Value === '→' && arrow2Value === '↓') {
        mousePointerArr.current.push({ x: lastPoint.x + length2Value / 10, y: lastPoint.y + length1Value / 10 })
      } else if (arrow1Value === '→' && arrow2Value === '↑') {
        mousePointerArr.current.push({ x: lastPoint.x + length2Value / 10, y: lastPoint.y - length1Value / 10 })
      } else if (arrow1Value === '←' && arrow2Value === '↓') {
        mousePointerArr.current.push({ x: lastPoint.x - length2Value / 10, y: lastPoint.y + length1Value / 10 })
      } else if (arrow1Value === '←' && arrow2Value === '↑') {
        mousePointerArr.current.push({ x: lastPoint.x - length2Value / 10, y: lastPoint.y - length1Value / 10 })
      }
      drawLine()

      angle1Ref.current.focus()
    }
  }

  //대각선 완료될 경우 확인
  const checkDiagonal = (direction) => {
    const activeElem = document.activeElement
    const diagonalLength = outerLineDiagonalLengthRef.current.value // 대각선 길이

    const length1Value = length1Ref.current.value

    if (diagonalLength <= length1Value) {
      alert('대각선 길이는 직선 길이보다 길어야 합니다.')
      return
    }

    const canDirection =
      direction === '↓' || direction === '↑'
        ? arrow1Ref.current === '←' || arrow1Ref.current === '→'
        : arrow1Ref.current === '↓' || arrow1Ref.current === '↑'

    if (activeElem === length1Ref.current) {
      setArrow1(direction)
      arrow1Ref.current = direction
    } else if (activeElem === length2Ref.current || activeElem === angle2Ref.current) {
      if (!canDirection) {
        return
      }
      setArrow2(direction)
      arrow2Ref.current = direction
    }

    const arrow1Value = arrow1Ref.current
    const arrow2Value = arrow2Ref.current

    const getLength2 = () => {
      return Math.floor(Math.sqrt(diagonalLength ** 2 - length1Value ** 2))
    }

    const length2Value = getLength2()

    if (diagonalLength !== 0 && length1Value !== 0 && arrow1Value !== '') {
      setLength2(getLength2())
      length2Ref.current.focus()
    }

    const lastPoint = mousePointerArr.current[0]

    if (length1Value !== 0 && length2Value !== 0 && arrow1Value !== '' && arrow2Value !== '') {
      if (arrow1Value === '↓' && arrow2Value === '→') {
        mousePointerArr.current.push({ x: lastPoint.x + length2Value / 10, y: lastPoint.y + length1Value / 10 })
      } else if (arrow1Value === '↓' && arrow2Value === '←') {
        mousePointerArr.current.push({ x: lastPoint.x - length2Value / 10, y: lastPoint.y + length1Value / 10 })
      } else if (arrow1Value === '↑' && arrow2Value === '→') {
        mousePointerArr.current.push({ x: lastPoint.x + length2Value / 10, y: lastPoint.y - length1Value / 10 })
      } else if (arrow1Value === '↑' && arrow2Value === '←') {
        mousePointerArr.current.push({ x: lastPoint.x - length2Value / 10, y: lastPoint.y - length1Value / 10 })
      } else if (arrow1Value === '→' && arrow2Value === '↓') {
        mousePointerArr.current.push({ x: lastPoint.x + length1Value / 10, y: lastPoint.y + length2Value / 10 })
      } else if (arrow1Value === '→' && arrow2Value === '↑') {
        mousePointerArr.current.push({ x: lastPoint.x + length1Value / 10, y: lastPoint.y - length2Value / 10 })
      }
      drawLine()
    }
  }

  const drawLine = () => {
    canvas.remove(...canvas.getObjects().filter((obj) => obj.name === 'innerPoint'))
    const line = addLine([mousePointerArr.current[0].x, mousePointerArr.current[0].y, mousePointerArr.current[1].x, mousePointerArr.current[1].y], {
      stroke: 'black',
      strokeWidth: 1,
      selectable: false,
      name: 'auxiliaryLine',
    })

    lineHistory.current.push(line)
    mousePointerArr.current = []
    clear()
  }

  const mouseDown = (e) => {
    canvas.renderAll()
    const pointer = getIntersectMousePoint(e)
    console.log(pointer)

    mousePointerArr.current.push(pointer)
    if (mousePointerArr.current.length === 2) {
      drawLine(mousePointerArr.current[0], mousePointerArr.current[1])
    } else {
      const circle = new fabric.Circle({
        radius: 3,
        fill: 'red',
        left: pointer.x - 3,
        top: pointer.y - 3,
        x: pointer.x,
        y: pointer.y,
        name: 'innerPoint',
        selectable: true,
      })
      canvas.add(circle)
      canvas.renderAll()
    }
  }

  const mouseMove = (e) => {
    removeMouseLine()
    // 가로선
    const pointer = canvas.getPointer(e.e)
    const auxiliaryLines = canvas.getObjects().filter((obj) => obj.name === 'auxiliaryLine' && !obj.isFixed)

    const otherAdsorptionPoints = []

    auxiliaryLines.forEach((line1) => {
      auxiliaryLines.forEach((line2) => {
        if (line1 === line2) {
          return
        }

        const intersectionPoint = calculateIntersection(line1, line2)
        if (!intersectionPoint || intersectionPoints.current.some((point) => point.x === intersectionPoint.x && point.y === intersectionPoint.y)) {
          return
        }
        otherAdsorptionPoints.push(intersectionPoint)
      })
    })

    const adsorptionPoints = [...getAdsorptionPoints(), ...roofAdsorptionPoints.current, ...otherAdsorptionPoints, ...intersectionPoints.current]

    let arrivalPoint = { x: pointer.x, y: pointer.y }

    // pointer와 adsorptionPoints의 거리를 계산하여 가장 가까운 점을 찾는다.
    let adsorptionPoint = findClosestPoint(pointer, adsorptionPoints)

    if (adsorptionPoint && distanceBetweenPoints(pointer, adsorptionPoint) <= adsorptionRange) {
      arrivalPoint = { ...adsorptionPoint }
    }

    const horizontalLine = new fabric.Line([-1 * canvas.width, arrivalPoint.y, 2 * canvas.width, arrivalPoint.y], {
      stroke: 'red',
      strokeWidth: 1,
      selectable: false,
      name: 'mouseLine',
    })

    // 세로선
    const verticalLine = new fabric.Line([arrivalPoint.x, -1 * canvas.height, arrivalPoint.x, 2 * canvas.height], {
      stroke: 'red',
      strokeWidth: 1,
      selectable: false,
      name: 'mouseLine',
    })

    // 선들을 캔버스에 추가합니다.
    canvas?.add(horizontalLine, verticalLine)

    // 캔버스를 다시 그립니다.
    canvas?.renderAll()
  }

  // 보조선 절삭
  const cutAuxiliary = (e) => {
    const auxiliaryLines = canvas.getObjects().filter((obj) => obj.name === 'auxiliaryLine')

    if (auxiliaryLines.length === 0) {
      return
    }

    const roofBases = canvas.getObjects().filter((obj) => obj.name === 'roofBase')

    const allLines = [...auxiliaryLines]

    roofBases.forEach((roofBase) => {
      roofBase.lines.forEach((line) => {
        allLines.push(line)
      })
    })

    auxiliaryLines.forEach((line1) => {
      allLines.forEach((line2) => {
        if (line1 === line2) {
          return
        }
        const intersectionPoint = calculateIntersection(line1, line2)
        if (!intersectionPoint) {
          return
        }
        roofAdsorptionPoints.current.push(intersectionPoint)
        intersectionPoints.current.push(intersectionPoint)

        const distance1 = distanceBetweenPoints({ x: line1.x1, y: line1.y1 }, intersectionPoint)
        const distance2 = distanceBetweenPoints({ x: line1.x2, y: line1.y2 }, intersectionPoint)

        if (distance1 === 0 || distance2 === 0) {
          return
        }
        //historyLine에서 기존 line을 제거한다.
        lineHistory.current = lineHistory.current.filter((history) => history !== line1)

        let newLine

        if (distance1 >= distance2) {
          newLine = addLine([line1.x1, line1.y1, intersectionPoint.x, intersectionPoint.y], {
            stroke: 'black',
            strokeWidth: 1,
            selectable: false,
            name: 'auxiliaryLine',
            isFixed: true,
            intersectionPoint,
          })
        } else {
          newLine = addLine([line1.x2, line1.y2, intersectionPoint.x, intersectionPoint.y], {
            stroke: 'black',
            strokeWidth: 1,
            selectable: false,
            name: 'auxiliaryLine',
            isFixed: true,
            intersectionPoint,
          })
        }
        lineHistory.current.push(newLine)
        removeLine(line1)
      })
    })
    addCanvasMouseEventListener('mouse:move', mouseMove)
  }

  /**
   * 일변전으로 돌아가기
   */
  const handleRollback = () => {
    const innerPoint = canvas.getObjects().find((obj) => obj.name === 'innerPoint')
    if (innerPoint) {
      mousePointerArr.current = []
      canvas.remove(innerPoint)
      canvas.renderAll()
      return
    }

    const lastLine = lineHistory.current.pop()
    if (lastLine) {
      roofAdsorptionPoints.current = roofAdsorptionPoints.current.filter(
        (point) => point.x !== lastLine.intersectionPoint?.x && point.y !== lastLine.intersectionPoint?.y,
      )

      canvas.remove(lastLine)
      canvas.renderAll()
    }

    addCanvasMouseEventListener('mouse:move', mouseMove)
  }

  const handleFix = () => {
    if (!confirm('지붕선 완료하시겠습니까?')) {
      return
    }

    const roofBases = canvas.getObjects().filter((obj) => obj.name === 'roofBase')
    const innerLines = [...lineHistory.current]

    roofBases.forEach((roofBase) => {
      const roofInnerLines = innerLines.filter((line) => {
        const turfPolygon = polygonToTurfPolygon(roofBase)

        // innerLines의 두 점이 모두 polygon 안에 있는지 확인
        const inPolygon1 = booleanPointInPolygon([line.x1, line.y1], turfPolygon)
        const inPolygon2 = booleanPointInPolygon([line.x2, line.y2], turfPolygon)

        if (inPolygon1 && inPolygon2) {
          line.attributes = { ...line.attributes, roofId: roofBase.id }
          return true
        }
      })

      roofBase.innerLines = [...roofInnerLines]
    })

    setShowAuxiliaryModal(false)
  }

  return {
    length1,
    setLength1,
    length2,
    setLength2,
    length1Ref,
    length2Ref,
    arrow1,
    setArrow1,
    arrow2,
    setArrow2,
    arrow1Ref,
    arrow2Ref,
    angle1,
    setAngle1,
    angle1Ref,
    angle2,
    setAngle2,
    angle2Ref,
    outerLineDiagonalLength,
    setOuterLineDiagonalLength,
    outerLineDiagonalLengthRef,
    type,
    setType,
    handleFix,
    handleRollback,
    buttonAct,
    setButtonAct,
  }
}