package decimal

import (
	"github.com/shopspring/decimal"
)

// Percent2PointMax9999 百分额，保留2位小数，如果分母为0 ，最大返回9999%
func Percent2PointMax9999(numerator, denominator int64) string {
	zero, ok := DenZero(numerator, denominator, 9999)
	if ok {
		return zero.StringFixedBank(2)
	}

	val := Percent(numerator, denominator)
	fnum := val.InexactFloat64()
	if fnum > 0 && fnum < 0.01 {
		return "0.01"
	}

	return val.StringFixedBank(2)
}

// Chain1PointMax999 环比，保留1位小数据，如果分母为0 ，最大返回999%
func Chain1PointMax999(numerator, denominator int64) (int32, string) {
	if numerator == 0 {
		return 0, "0"
	}

	zero, ok := DenZero(numerator, denominator, 999)
	if ok {
		return 1, zero.StringFixed(1)
	}

	var status int32

	val := Chain(numerator, denominator).Mul(decimal.NewFromFloat(100))

	fnum := val.InexactFloat64()
	if fnum < 0 {
		status = 2
	} else if fnum > 0 {
		status = 1
	}

	val = val.Abs()

	fnum = val.InexactFloat64()
	if fnum > 0 && fnum < 0.1 {
		return status, "0.1"
	}

	return status, val.StringFixed(1)
}

// Percent2PointMap 百分额hash表，保证计算合计100%
func Percent2PointMap(children []*Operator, denominator int64) OperatorMap {
	om := make(OperatorMap, len(children))

	var oc []*Operator
	for _, child := range children {
		if child.Num == 0 || denominator == 0 {
			om[child.Id] = "0.00"
		} else {
			oc = append(oc, child)
		}
	}

	lid := len(oc)
	if lid > 1 {
		var zero = decimal.Zero
		var dec = make(map[int64]decimal.Decimal)
		var maxChild = decimal.Zero
		var maxIdx int64
		for _, child := range oc {
			val := Percent(child.Num, denominator)
			if val.InexactFloat64() < 0.01 {
				val = decimal.NewFromFloat(0.01)
			}

			// 只要小数后两位
			val = val.RoundBank(2)

			if val.GreaterThan(maxChild) {
				maxChild = val
				maxIdx = child.Id
			}

			dec[child.Id] = val
			zero = zero.Add(val)
		}

		var hundred = decimal.NewFromFloat(100)

		if zero.GreaterThan(hundred) {
			dec[maxIdx] = dec[maxIdx].Sub(zero.Sub(hundred))
		} else if zero.LessThan(hundred) {
			dec[maxIdx] = dec[maxIdx].Add(hundred.Sub(zero))
		}

		for id, v := range dec {
			om[id] = v.StringFixedBank(2)
		}
	} else if lid == 1 {
		om[oc[0].Id] = "100.00"
	}

	return om
}