package basic

import (
	"math"

	"b612.me/astro/planet"
	. "b612.me/astro/tools"
)

func VenusL(jde float64) float64 {
	return planet.WherePlanet(2, 0, jde)
}

func VenusB(jde float64) float64 {
	return planet.WherePlanet(2, 1, jde)
}
func VenusR(jde float64) float64 {
	return planet.WherePlanet(2, 2, jde)
}
func AVenusX(jde float64) float64 {
	l := VenusL(jde)
	b := VenusB(jde)
	r := VenusR(jde)
	el := planet.WherePlanet(-1, 0, jde)
	eb := planet.WherePlanet(-1, 1, jde)
	er := planet.WherePlanet(-1, 2, jde)
	x := r*Cos(b)*Cos(l) - er*Cos(eb)*Cos(el)
	return x
}

func AVenusY(jde float64) float64 {

	l := VenusL(jde)
	b := VenusB(jde)
	r := VenusR(jde)
	el := planet.WherePlanet(-1, 0, jde)
	eb := planet.WherePlanet(-1, 1, jde)
	er := planet.WherePlanet(-1, 2, jde)
	y := r*Cos(b)*Sin(l) - er*Cos(eb)*Sin(el)
	return y
}
func AVenusZ(jde float64) float64 {
	//l := VenusL(jde)
	b := VenusB(jde)
	r := VenusR(jde)
	//	el := planet.WherePlanet(-1, 0, jde)
	eb := planet.WherePlanet(-1, 1, jde)
	er := planet.WherePlanet(-1, 2, jde)
	z := r*Sin(b) - er*Sin(eb)
	return z
}

func AVenusXYZ(jde float64) (float64, float64, float64) {
	l := VenusL(jde)
	b := VenusB(jde)
	r := VenusR(jde)
	el := planet.WherePlanet(-1, 0, jde)
	eb := planet.WherePlanet(-1, 1, jde)
	er := planet.WherePlanet(-1, 2, jde)
	x := r*Cos(b)*Cos(l) - er*Cos(eb)*Cos(el)
	y := r*Cos(b)*Sin(l) - er*Cos(eb)*Sin(el)
	z := r*Sin(b) - er*Sin(eb)
	return x, y, z
}

func VenusApparentRa(jde float64) float64 {
	lo, bo := VenusApparentLoBo(jde)
	eps := TrueObliquity(jde)
	ra := math.Atan2((Sin(lo)*Cos(eps) - Tan(bo)*Sin(eps)), Cos(lo))
	ra = ra * 180 / math.Pi
	return Limit360(ra)
}
func VenusApparentDec(jde float64) float64 {
	lo, bo := VenusApparentLoBo(jde)
	eps := TrueObliquity(jde)
	dec := ArcSin(Sin(bo)*Cos(eps) + Cos(bo)*Sin(eps)*Sin(lo))
	return dec
}

func VenusApparentRaDec(jde float64) (float64, float64) {
	lo, bo := VenusApparentLoBo(jde)
	eps := TrueObliquity(jde)
	ra := math.Atan2((Sin(lo)*Cos(eps) - Tan(bo)*Sin(eps)), Cos(lo))
	ra = ra * 180 / math.Pi
	dec := ArcSin(Sin(bo)*Cos(eps) + Cos(bo)*Sin(eps)*Sin(lo))
	return Limit360(ra), dec
}

func EarthVenusAway(jd float64) float64 {
	return planetEarthAwayExplicitN(2, jd, -1)
}

func VenusApparentLo(jd float64) float64 {
	geo, _ := planetApparentGeocentricPositionN(2, jd, -1)
	return geo.lo
}

func VenusApparentBo(jd float64) float64 {
	geo, _ := planetApparentGeocentricPositionN(2, jd, -1)
	return geo.bo
}

func VenusApparentLoBo(jd float64) (float64, float64) {
	geo, _ := planetApparentGeocentricPositionN(2, jd, -1)
	return geo.lo, geo.bo
}

func VenusMag(jde float64) float64 {
	sunDistance := VenusR(jde)
	earthDistance := EarthVenusAway(jde)
	earthSunDistance := planet.WherePlanet(-1, 2, jde)
	i := (sunDistance*sunDistance + earthDistance*earthDistance - earthSunDistance*earthSunDistance) / (2 * sunDistance * earthDistance)
	i = ArcCos(i)
	mag := -4.40 + 5*math.Log10(sunDistance*earthDistance) + 0.0009*i + 0.000239*i*i - 0.00000065*i*i*i
	return FloatRound(mag, 2)
}

// VenusHeightWithInstance 用指定星历实例求值；inst 为 nil 时用进程当前模型 / evaluation with an explicit instance; nil uses the process model.
func VenusHeightWithInstance(localJD, lon, lat, timezone float64, inst *Instance) float64 {
	return planetHeightN(2, localJD, lon, lat, timezone, -1, inst)
}

// VenusAzimuthWithInstance 用指定星历实例求值；inst 为 nil 时用进程当前模型 / evaluation with an explicit instance; nil uses the process model.
func VenusAzimuthWithInstance(localJD, lon, lat, timezone float64, inst *Instance) float64 {
	return planetAzimuthN(2, localJD, lon, lat, timezone, -1, inst)
}

// VenusHourAngleWithInstance 用指定星历实例求值；inst 为 nil 时用进程当前模型 / evaluation with an explicit instance; nil uses the process model.
func VenusHourAngleWithInstance(jd, lon, tz float64, inst *Instance) float64 {
	startime := Limit360(ApparentSiderealTime(UTC2UT1(jd-tz/24))*15 + lon)
	timeangle := startime - VenusApparentRaWithInstance(UTC2TT(jd-tz/24.0), inst)
	if timeangle < 0 {
		timeangle += 360
	}
	return timeangle
}

// VenusCulminationTimeWithInstance 用指定星历实例求值；inst 为 nil 时用进程当前模型 / evaluation with an explicit instance; nil uses the process model.
func VenusCulminationTimeWithInstance(localJD, lon, timezone float64, inst *Instance) float64 {
	// localJD 是本地民用日锚点（当地 0 时），不是力学时。
	//ra,dec 瞬时天球座标，非J2000等时间天球坐标
	localJD = math.Floor(localJD) + 0.5
	estimateJD := localJD + Limit360(360-VenusHourAngleWithInstance(localJD, lon, timezone, inst))/15.0/24.0*0.99726851851851851851
	limitHA := func(localJD, lon, timezone float64) float64 {
		ha := VenusHourAngleWithInstance(localJD, lon, timezone, inst)
		if ha < 180 {
			ha += 360
		}
		return ha
	}
	var ok bool
	estimateJD, ok = eventNewtonRefine(estimateJD, 0.00001, func(prevJD float64) float64 {
		stDegree := limitHA(prevJD, lon, timezone) - 360
		stDegreep := (limitHA(prevJD+0.000005, lon, timezone) - limitHA(prevJD-0.000005, lon, timezone)) / 0.00001
		return stDegree / stDegreep
	})
	if !ok {
		return math.NaN()
	}
	return estimateJD
}

// VenusRiseTimeWithInstance 用指定星历实例求值；inst 为 nil 时用进程当前模型 / evaluation with an explicit instance; nil uses the process model.
func VenusRiseTimeWithInstance(jd, lon, lat, tz, aeroCorrection, observerHeight float64, inst *Instance) (float64, error) {
	return venusRiseDown(jd, lon, lat, tz, aeroCorrection, observerHeight, true, inst)
}

// VenusSetTimeWithInstance 用指定星历实例求值；inst 为 nil 时用进程当前模型 / evaluation with an explicit instance; nil uses the process model.
func VenusSetTimeWithInstance(jd, lon, lat, tz, aeroCorrection, observerHeight float64, inst *Instance) (float64, error) {
	return venusRiseDown(jd, lon, lat, tz, aeroCorrection, observerHeight, false, inst)
}

func venusRiseDown(jd, lon, lat, tz, aeroCorrection, observerHeight float64, isRise bool, instances ...*Instance) (float64, error) {
	inst := instanceValue(instances)

	return planetRiseDown(jd, lon, lat, tz, aeroCorrection, observerHeight, isRise, func(localJD, lon, timezone float64) float64 {
		return VenusCulminationTimeWithInstance(localJD, lon, timezone, inst)
	}, func(localJD, lon, lat, timezone float64) float64 {
		return VenusHeightWithInstance(localJD, lon, lat, timezone, inst)
	}, func(jde float64) float64 { return VenusApparentDecWithInstance(jde, inst) })
}