import {
  lineTo,
  xLineTo,
  yLineTo,
  line,
  xLine,
  yLine,
  angledLine,
  angledLineOfXLength,
  angledLineToX,
  angledLineOfYLength,
  angledLineToY,
  closee,
  startSketchAt,
  getCoordsFromPaths,
} from './sketch'
import {
  segLen,
  angleToMatchLengthX,
  angleToMatchLengthY,
  segEndX,
  segEndY,
  lastSegX,
  lastSegY,
} from './sketchConstraints'
import { extrude, getExtrudeWallTransform } from './extrude'
import { Quaternion, Vector3 } from 'three'
import { SketchGroup, ExtrudeGroup, Position, Rotation } from '../executor'

import { InternalFn, InternalFnNames, InternalFirstArg } from './stdTypes'
import { intersectionWithParallelLine } from 'sketch-helpers'

const transform: InternalFn = <T extends SketchGroup | ExtrudeGroup>(
  { sourceRange }: InternalFirstArg,
  transformInfo: {
    position: Position
    quaternion: Rotation
  },
  sketch: T
): T => {
  const quaternionToApply = new Quaternion(...transformInfo.quaternion)
  const newQuaternion = new Quaternion(...sketch.rotation).multiply(
    quaternionToApply.invert()
  )

  const oldPosition = new Vector3(...sketch.position)
  const newPosition = oldPosition
    .applyQuaternion(quaternionToApply)
    .add(new Vector3(...transformInfo.position))
  return {
    ...sketch,
    position: newPosition.toArray(),
    rotation: newQuaternion.toArray(),
    __meta: [
      ...sketch.__meta,
      {
        sourceRange,
        pathToNode: [], // TODO
      },
    ],
  }
}

const translate: InternalFn = <T extends SketchGroup | ExtrudeGroup>(
  { sourceRange }: InternalFirstArg,
  vec3: [number, number, number],
  sketch: T
): T => {
  const oldPosition = new Vector3(...sketch.position)
  const newPosition = oldPosition.add(new Vector3(...vec3))
  return {
    ...sketch,
    position: newPosition.toArray(),
    __meta: [
      ...sketch.__meta,
      {
        sourceRange,
        pathToNode: [], // TODO
      },
    ],
  }
}

const angledLineThatIntersects: InternalFn = (
  { sourceRange, programMemory },
  data: {
    angle: number
    intersectTag: string
    offset?: number
    tag?: string
  },
  previousSketch: SketchGroup
) => {
  if (!previousSketch) throw new Error('lineTo must be called after lineTo')
  const intersectPath = previousSketch.value.find(
    ({ name }) => name === data.intersectTag
  )
  if (!intersectPath) throw new Error('intersectTag must match a line')
  const from = getCoordsFromPaths(
    previousSketch,
    previousSketch.value.length - 1
  )
  const to = intersectionWithParallelLine({
    line1: [intersectPath.from, intersectPath.to],
    line1Offset: data.offset || 0,
    line2Point: from,
    line2Angle: data.angle,
  })
  return lineTo.fn(
    { sourceRange, programMemory },
    { to, tag: data.tag },
    previousSketch
  )
}

const min: InternalFn = (_, a: number, b: number): number => Math.min(a, b)

const legLen: InternalFn = (_, hypotenuse: number, leg: number): number =>
  Math.sqrt(
    hypotenuse ** 2 - Math.min(Math.abs(leg), Math.abs(hypotenuse)) ** 2
  )

const legAngX: InternalFn = (_, hypotenuse: number, leg: number): number =>
  (Math.acos(Math.min(leg, hypotenuse) / hypotenuse) * 180) / Math.PI

const legAngY: InternalFn = (_, hypotenuse: number, leg: number): number =>
  (Math.asin(Math.min(leg, hypotenuse) / hypotenuse) * 180) / Math.PI

export const internalFns: { [key in InternalFnNames]: InternalFn } = {
  rx: rotateOnAxis([1, 0, 0]),
  ry: rotateOnAxis([0, 1, 0]),
  rz: rotateOnAxis([0, 0, 1]),
  extrude,
  translate,
  transform,
  getExtrudeWallTransform,
  min,
  legLen,
  legAngX,
  legAngY,
  segEndX,
  segEndY,
  lastSegX,
  lastSegY,
  segLen,
  angleToMatchLengthX,
  angleToMatchLengthY,
  lineTo: lineTo.fn,
  xLineTo: xLineTo.fn,
  yLineTo: yLineTo.fn,
  line: line.fn,
  xLine: xLine.fn,
  yLine: yLine.fn,
  angledLine: angledLine.fn,
  angledLineOfXLength: angledLineOfXLength.fn,
  angledLineToX: angledLineToX.fn,
  angledLineOfYLength: angledLineOfYLength.fn,
  angledLineToY: angledLineToY.fn,
  angledLineThatIntersects,
  startSketchAt,
  closee,
}

function rotateOnAxis<T extends SketchGroup | ExtrudeGroup>(
  axisMultiplier: [number, number, number]
): InternalFn {
  return ({ sourceRange }, rotationD: number, sketch: T): T => {
    const rotationR = rotationD * (Math.PI / 180)
    const rotateVec = new Vector3(...axisMultiplier)
    const quaternion = new Quaternion()
    quaternion.setFromAxisAngle(rotateVec, rotationR)

    const position = new Vector3(...sketch.position)
      .applyQuaternion(quaternion)
      .toArray()

    const existingQuat = new Quaternion(...sketch.rotation)
    const rotation = quaternion.multiply(existingQuat).toArray()
    return {
      ...sketch,
      rotation,
      position,
      __meta: [
        ...sketch.__meta,
        {
          sourceRange,
          pathToNode: [], // TODO
        },
      ],
    }
  }
}

export function clockwiseSign(points: [number, number][]): number {
  let sum = 0
  for (let i = 0; i < points.length; i++) {
    const currentPoint = points[i]
    const nextPoint = points[(i + 1) % points.length]
    sum += (nextPoint[0] - currentPoint[0]) * (nextPoint[1] + currentPoint[1])
  }
  return sum >= 0 ? 1 : -1
}