import { Bezier } from 'bezier-js'
import { DaumiShape, getDaumiElementLocation } from './daumiShape'
import { getPointOnCurve } from './getPointOnCurve'
import { angleBetweenTwoPoints, normalizeRad } from './helperFunctions'
import { setDebugVar } from 'utils/debugPoints'
import { NemiCurveBezier } from './nemiCurve'
import { getAdjustedT } from './bezier'

export const getAngleOnDaumiShape = (
  chart: {
    daumiShape: DaumiShape
  },
  percentage: number,
) => {
  const daumiShape = chart.daumiShape
  const elementLocation = getDaumiElementLocation(daumiShape, percentage)
  const curve = elementLocation.element.innerCurve

  switch (curve.type) {
    case 'line': {
      const angle = angleBetweenTwoPoints(curve.startPoint, curve.endPoint)
      return normalizeRad(angle + Math.PI / 2)
    }
    case 'arc': {
      const { startAngle, radians } = curve

      return normalizeRad(startAngle + radians * elementLocation.percentageOnElement + Math.PI / 2)
    }
    case 'bezier': {
      const bezier = new Bezier(curve.startPoint, curve.controlPoint1, curve.controlPoint2, curve.endPoint)
      const normal = bezier.normal(getAdjustedT(bezier, elementLocation.percentageOnElement))
      return normalizeRad(Math.atan2(normal.y, normal.x) - Math.PI / 2)
    }
  }
}