import { useRecoilValue } from 'recoil'
import { canvasState, canvasZoomState, dotLineGridSettingState } from '@/store/canvasAtom'
import { useEffect } from 'react'
import { gridColorState } from '@/store/gridAtom'
import { gridDisplaySelector } from '@/store/settingAtom'

const GRID_PADDING = 5

export function useGrid() {
  const canvas = useRecoilValue(canvasState)

  const dotLineGridSetting = useRecoilValue(dotLineGridSettingState)
  const gridColor = useRecoilValue(gridColorState)
  const isGridDisplay = useRecoilValue(gridDisplaySelector)
  const zoom = useRecoilValue(canvasZoomState)

  useEffect(() => {
    if (!canvas) {
      return
    }

    const patternData = {
      dotGridDisplay: dotLineGridSetting.DOT,
      lineGridDisplay: dotLineGridSetting.LINE,
      gridType: dotLineGridSetting.INTERVAL.type,
      gridHorizon: (dotLineGridSetting.INTERVAL.horizontalInterval / 10) * (dotLineGridSetting.INTERVAL.dimension ?? 1),
      gridVertical: (dotLineGridSetting.INTERVAL.verticalInterval / 10) * (dotLineGridSetting.INTERVAL.dimension ?? 1),
      gridRatio: dotLineGridSetting.INTERVAL.ratioInterval / 10,
      gridDimen: dotLineGridSetting.INTERVAL.dimension,
    }

    // 1. 점.선 그리드 설정으로 만들어진 기존 오브젝트 제거
    canvas
      ?.getObjects()
      .filter((obj) => ['lineGrid', 'dotGrid'].includes(obj.name))
      .forEach((obj) => canvas?.remove(obj))

    //const horizontalInterval = interval.horizontalInterval
    //const verticalInterval = interval.verticalInterval

    if (patternData.dotGridDisplay) {
      const canvasWidth = canvas.getWidth()
      const canvasHeight = canvas.getHeight()
      const currentZoom = canvas.getZoom()
      const viewportTransform = canvas.viewportTransform

      const visibleLeft = -viewportTransform[4] / currentZoom
      const visibleTop = -viewportTransform[5] / currentZoom
      const visibleRight = visibleLeft + canvasWidth / currentZoom
      const visibleBottom = visibleTop + canvasHeight / currentZoom

      const padding = 200
      // 원점(0,0) 기준 그리드 간격의 배수로 정렬하여 줌 시 위치 고정
      const gridLeft = Math.floor((visibleLeft - padding) / patternData.gridHorizon) * patternData.gridHorizon
      const gridTop = Math.floor((visibleTop - padding) / patternData.gridVertical) * patternData.gridVertical
      const gridRight = visibleRight + padding
      const gridBottom = visibleBottom + padding

      const horizontalCount = Math.ceil((gridRight - gridLeft) / patternData.gridHorizon) + 1
      const verticalCount = Math.ceil((gridBottom - gridTop) / patternData.gridVertical) + 1

      for (let i = 0; i < horizontalCount; i++) {
        for (let j = 0; j < verticalCount; j++) {
          const dot = new fabric.Circle({
            left: gridLeft + i * patternData.gridHorizon,
            top: gridTop + j * patternData.gridVertical,
            radius: 2,
            fill: 'red',
            stroke: null,
            strokeWidth: 0,
            originX: 'center',
            originY: 'center',
            selectable: true,
            lockMovementX: true,
            lockMovementY: true,
            lockRotation: true,
            lockScalingX: true,
            lockScalingY: true,
            name: 'dotGrid',
            padding: GRID_PADDING,
            visible: isGridDisplay,
          })
          canvas.add(dot)
          dot.sendToBack()
        }
      }
      canvas.renderAll()
    }

    if (patternData.lineGridDisplay) {
      // 캔버스의 실제 보이는 영역 계산
      const canvasWidth = canvas.getWidth()
      const canvasHeight = canvas.getHeight()
      const currentZoom = canvas.getZoom()
      const viewportTransform = canvas.viewportTransform

      const visibleLeft = -viewportTransform[4] / currentZoom
      const visibleTop = -viewportTransform[5] / currentZoom
      const visibleRight = visibleLeft + canvasWidth / currentZoom
      const visibleBottom = visibleTop + canvasHeight / currentZoom

      // 여유 공간 추가
      const padding = 200
      // 원점(0,0) 기준 그리드 간격의 배수로 정렬하여 줌 시 위치 고정
      const gridLeft = Math.floor((visibleLeft - padding) / patternData.gridHorizon) * patternData.gridHorizon
      const gridTop = Math.floor((visibleTop - padding) / patternData.gridVertical) * patternData.gridVertical
      const gridRight = visibleRight + padding
      const gridBottom = visibleBottom + padding

      // 가로선 생성 (수평선)
      const horizontalGridRange = gridBottom - gridTop
      const horizontalGridCount = Math.ceil(horizontalGridRange / patternData.gridVertical) + 2
      
      for (let i = 0; i < horizontalGridCount; i++) {
        const y = gridTop + i * patternData.gridVertical
        const horizontalLine = new fabric.Line(
          [gridLeft, y, gridRight, y],
          {
            stroke: gridColor,
            strokeWidth: 1,
            selectable: true,
            lockMovementX: true,
            lockMovementY: true,
            lockRotation: true,
            lockScalingX: true,
            lockScalingY: true,
            name: 'lineGrid',
            strokeDashArray: [5, 2],
            opacity: 0.3,
            padding: GRID_PADDING,
            direction: 'horizontal',
            visible: isGridDisplay,
          },
        )
        canvas.add(horizontalLine)
      }

      // 세로선 생성 (수직선)
      const verticalGridRange = gridRight - gridLeft
      const verticalGridCount = Math.ceil(verticalGridRange / patternData.gridHorizon) + 2
      
      for (let i = 0; i < verticalGridCount; i++) {
        const x = gridLeft + i * patternData.gridHorizon
        const verticalLine = new fabric.Line(
          [x, gridTop, x, gridBottom],
          {
            stroke: gridColor,
            strokeWidth: 1,
            selectable: true,
            lockMovementX: true,
            lockMovementY: true,
            lockRotation: true,
            lockScalingX: true,
            lockScalingY: true,
            name: 'lineGrid',
            strokeDashArray: [5, 2],
            opacity: 0.3,
            padding: GRID_PADDING,
            direction: 'vertical',
            visible: isGridDisplay,
          },
        )
        canvas.add(verticalLine)
      }
    }

    canvas.renderAll()
  }, [dotLineGridSetting, zoom])

  const move = (object, x, y) => {
    object.set({
      ...object,
      x1: object.direction === 'vertical' ? object.x1 + x : -1500,
      x2: object.direction === 'vertical' ? object.x1 + x : 2500,
      y1: object.direction === 'vertical' ? -1500 : object.y1 + y,
      y2: object.direction === 'vertical' ? 2500 : object.y1 + y,
    })
  }

  const copy = (object, length) => {
    const lineStartX = object.direction === 'vertical' ? object.x1 + length : -1500
    const lineEndX = object.direction === 'vertical' ? object.x2 + length : 2500
    const lineStartY = object.direction === 'vertical' ? -1500 : object.y1 + length
    const lineEndY = object.direction === 'vertical' ? 2500 : object.y1 + length

    const line = new fabric.Line([lineStartX, lineStartY, lineEndX, lineEndY], {
      stroke: gridColor,
      strokeWidth: 1,
      selectable: true,
      lockMovementX: true,
      lockMovementY: true,
      lockRotation: true,
      lockScalingX: true,
      lockScalingY: true,
      strokeDashArray: [5, 2],
      opacity: 0.3,
      padding: GRID_PADDING,
      direction: object.direction,
      visible: isGridDisplay,
      name: object.name,
    })

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

  const removeGrid = () => {
    canvas
      .getObjects()
      .filter((obj) => ['lineGrid', 'dotGrid', 'tempGrid'].includes(obj.name))
      .forEach((obj) => canvas.remove(obj))
    canvas.renderAll()
  }

  return {
    move,
    copy,
    removeGrid,
  }
}