package number

import (
	"fmt"
	"regexp"
)

var (
	FloatingPrecision uint64 = 10    // Nombre de chiffres après la virgule pour un nombre décimal ou un nombre scientifique
	FixedPrecision           = false // Si vrai le nombre de chiffres après la virgule est fixe.
)

const (
	rSign   = `(\+|-)`
	rBSign  = `(0|1)`
	rNb2    = `(0|1)`
	rNb8    = `[0-7]`
	rNb10   = `\d`
	rNb16   = `[0-9a-fA-F]`
	rNbN    = `[0-9a-zA-Z]`
	rBase2  = `(B|b)`
	rBase8  = `(O|o)`
	rBase16 = `(X|x)`
	rExp10  = `E|e`
	rExpN   = `×\d+\^`
)

var (
	rInt2  = fmt.Sprintf(`(%s)%s+`, rBase2, rNb2)
	rInt8  = fmt.Sprintf(`(%s)%s+`, rBase8, rNb8)
	rInt10 = fmt.Sprintf(`(%s)%s+`, rSign, rNb10)
	rInt16 = fmt.Sprintf(`(%s)%s+`, rBase8, rNb8)
	rIntN  = fmt.Sprintf(`\(%s+\)%s?%s+`, rNb10, rSign, rNbN)
	rIntB  = fmt.Sprintf(`%s(%s|%s|%s)`, rBSign, rInt2, rInt8, rInt16)
	rInt   = fmt.Sprintf(`(%s|%s|%s)`, rInt10, rIntN, rIntB)

	rDec2       = fmt.Sprintf(`(%s)(%s+\.%s*|\.%s+)`, rBase2, rNb2, rNb2, rNb2)
	rDec8       = fmt.Sprintf(`(%s)(%s+\.%s*|\.%s+)`, rBase8, rNb8, rNb8, rNb8)
	rDec10      = fmt.Sprintf(`%s?(%s+\.%s*|\.%s+)`, rSign, rNb10, rNb10, rNb10)
	rDec16      = fmt.Sprintf(`(%s)(%s+\.%s*|\.%s+)`, rBase16, rNb16, rNb16, rNb16)
	rDecN       = fmt.Sprintf(`\(%s+\)%s?(%s+\.%s*|\.%s+)`, rNb10, rSign, rNbN, rNbN, rNbN)
	rDecB       = fmt.Sprintf(`%s(%s|%s|%s)`, rBSign, rDec2, rDec8, rDec16)
	rDec        = fmt.Sprintf(`(%s|%s|%s)`, rDec10, rDecN, rDecB)
	rExponent10 = fmt.Sprintf(`(%s|%s)(%s)%s?%s+`, rInt10, rDec10, rExp10, rSign, rNb10)
	rExponentN  = fmt.Sprintf(`(%s|%s)%s%s?%s+`, rInt, rDec, rExpN, rSign, rNb10)
	rAll10      = fmt.Sprintf(`(%s|%s)((%s)%s?%s+)?`, rInt10, rDec10, regExp10, rSign, rNb10)
	rAllN       = fmt.Sprintf(`(%s|%s)(%s%s?%s+)?`, rInt, rDec, rExpN, rSign, rNb10)
	rAll        = fmt.Sprintf(`(%s|%s)`, rAll10, rAllN)
)

var (
	regInt10 = regexp.MustCompile(fmt.Sprintf(`^%s$`, rInt10))
	regIntN  = regexp.MustCompile(fmt.Sprintf(`^%s$`, rIntN))
	regIntB  = regexp.MustCompile(fmt.Sprintf(`^%s$`, rIntB))

	regDec = regexp.MustCompile(fmt.Sprintf(`^%s$`, rDec))

	regExp10 = regexp.MustCompile(fmt.Sprintf(`^%s$`, rExponent10))
	regExpN  = regexp.MustCompile(fmt.Sprintf(`^%s$`, rExpN))

	regFrac = regexp.MustCompile(fmt.Sprintf(`^%s/%s$`, rAll, rAll))
)