package level

type Rank uint8

const (
	RankRecruit Rank = iota
	RankMember
	RankApprentice
	RankAdept
	RankExperienced
	RankVeteran
	RankProfessional
	RankElite
	RankEpic
	RankElder
	RankLegend
	RankInsane
	RankGodlike
	RankDemigod
)

func (r Rank) String() string {
	switch r {
	case RankRecruit:
		return "Recruit"
	case RankMember:
		return "Member"
	case RankApprentice:
		return "Apprentice"
	case RankAdept:
		return "Adept"
	case RankExperienced:
		return "Experienced"
	case RankVeteran:
		return "Veteran"
	case RankProfessional:
		return "Professional"
	case RankElite:
		return "Elite"
	case RankEpic:
		return "Epic"
	case RankElder:
		return "Elder"
	case RankLegend:
		return "Legend"
	case RankInsane:
		return "Insane"
	case RankGodlike:
		return "Godlike"
	case RankDemigod:
		return "Demigod"
	}
	return "Unknown"
}

func GetLevelFromXP(xp int64) (Rank, int) {
	// Level starting from 1
	level := int(xp/600 + 1)
	rank := 0
	// Get highest power of 2 we can go without touching it.
	// 3 => 1 (2^1=2)
	// 4 => 1 (2^1=2)
	// 5 => 2 (2^2=4)
	for level >= (1 << rank) {
		if rank == int(RankDemigod) {
			break
		}
		rank++
	}
	rank--
	// Return it.
	return Rank(rank), level - (1 << rank) + 1
}