import { useRecoilValue } from 'recoil'
import {
  ANGLE_TYPE,
  canvasState,
  currentAngleTypeSelector,
  fontFamilyState,
  fontSizeState,
  pitchTextSelector,
  showAngleUnitSelector,
} from '@/store/canvasAtom'
import { QLine } from '@/components/fabric/QLine'
import { getChonByDegree, getDegreeByChon } from '@/util/canvas-util'

export const useLine = () => {
  const canvas = useRecoilValue(canvasState)
  const fontSize = useRecoilValue(fontSizeState)
  const fontFamily = useRecoilValue(fontFamilyState)
  const currentAngleType = useRecoilValue(currentAngleTypeSelector)
  const pitchText = useRecoilValue(pitchTextSelector)
  const angleUnit = useRecoilValue(showAngleUnitSelector)

  const addLine = (points = [], options) => {
    const line = new QLine(points, {
      ...options,
      fontSize: fontSize,
      fontFamily: fontFamily,
    })

    if (line.length < 1) {
      return null
    }

    canvas?.add(line)
    return line
  }

  const hideLine = (line) => {
    line.set({
      visible: false,
    })
    canvas
      ?.getObjects()
      .find((obj) => obj.parent === line)
      .set({
        visible: false,
      })
    canvas?.renderAll()
  }

  const showLine = (line) => {
    line.set({
      visible: true,
    })
    canvas
      ?.getObjects()
      .find((obj) => obj.parent === line)
      .set({
        visible: true,
      })
    canvas?.renderAll()
  }

  const removeLine = (line) => {
    removeLineText(line)
    canvas?.remove(line)
    canvas?.renderAll()
  }

  const removeLineText = (line) => {
    canvas?.remove(canvas?.getObjects().find((obj) => obj.parent === line))
  }

  const getLengthByLine = (line) => {
    const scaleX = line.scaleX
    const scaleY = line.scaleY
    const x1 = line.left
    const y1 = line.top
    const x2 = line.left + line.width * scaleX
    const y2 = line.top + line.height * scaleY
    const dx = x2 - x1
    const dy = y2 - y1

    return Number(Math.sqrt(dx * dx + dy * dy).toFixed(1)) * 10
  }

  const addPitchText = (line) => {
    removePitchText(line)
    const { startPoint, endPoint, direction, attributes } = line
    const { offset, onlyOffset = false } = attributes
    if (offset === 0) {
      return
    }

    let left, top

    const textStr =
      currentAngleType === ANGLE_TYPE.SLOPE
        ? `${attributes.offset ? attributes.offset * 10 : attributes.width * 10}${!onlyOffset && attributes.pitch ? '-∠' + attributes.pitch + angleUnit : ''}`
        : `${attributes.offset ? attributes.offset * 10 : attributes.width * 10}${!onlyOffset && attributes.pitch ? '-∠' + getDegreeByChon(attributes.pitch) + angleUnit : ''}`

    if (direction === 'top') {
      left = (startPoint.x + endPoint.x) / 2
      top = (startPoint.y + endPoint.y) / 2 - 50
    } else if (direction === 'bottom') {
      left = (startPoint.x + endPoint.x) / 2
      top = (startPoint.y + endPoint.y) / 2 - 50
    } else if (direction === 'left') {
      left = (startPoint.x + endPoint.x) / 2 + 50
      top = (startPoint.y + endPoint.y) / 2 - 30
    } else if (direction === 'right') {
      left = (startPoint.x + endPoint.x) / 2 + 50
      top = (startPoint.y + endPoint.y) / 2 - 30
    }

    if (!attributes.pitch) {
      return
    }

    const text = new fabric.Text(`${textStr}`, {
      left,
      top,
      fontSize: 20,
      originText: `${attributes.offset ? attributes.offset * 10 : attributes.width * 10}`,
      fill: 'black',
      name: 'pitchText',
      parentId: line.id,
      pitch: attributes.pitch,
    })

    canvas.add(text)
  }

  const removePitchText = (line) => {
    const { id } = line
    const pitchText = canvas.getObjects().filter((obj) => obj.name === 'pitchText' && obj.parentId === id)

    // 기존 pitchText가 있으면 삭제
    if (pitchText.length > 0) {
      canvas.remove(pitchText)
    }
  }

  const addPitchTextsByOuterLines = () => {
    canvas
      .getObjects()
      .filter((obj) => obj.name === 'outerLine')
      .forEach((line) => {
        addPitchText(line)
      })
  }

  return {
    addLine,
    removeLine,
    hideLine,
    showLine,
    addPitchText,
    removePitchText,
    addPitchTextsByOuterLines,
  }
}