128 lines
2.1 KiB
Go
128 lines
2.1 KiB
Go
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package service
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const (
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_range0_30 float64 = 0.0
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_range30_50 float64 = 0.05
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_range50_100 float64 = 0.10
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_range100_150 float64 = 0.15
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_range150_300 float64 = 0.20
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_range300_500 float64 = 0.25
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_range500_1000 float64 = 0.30
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_range1000_2000 float64 = 0.40
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_range2000_3000 float64 = 0.50
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// _range3000_end float64 = 0.60
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)
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// TaxRate tax rate
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type TaxRate struct {
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start float64
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end float64
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rate float64
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}
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// Tax tax
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func Tax(income float64) (tax float64) {
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rs := rates(income)
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for _, r := range rs {
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if income >= r.end {
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tax += Mul(float64(r.end-r.start), r.rate)
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} else {
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tax += Mul(float64(income-r.start), r.rate)
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}
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}
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return
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}
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func rates(income float64) (rs []*TaxRate) {
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if income > 0 {
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r := &TaxRate{
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start: 0,
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end: 30,
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rate: _range0_30,
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}
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rs = append(rs, r)
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}
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if income > 30 {
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r := &TaxRate{
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start: 30,
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end: 50,
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rate: _range30_50,
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}
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rs = append(rs, r)
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}
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if income > 50 {
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r := &TaxRate{
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start: 50,
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end: 100,
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rate: _range50_100,
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}
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rs = append(rs, r)
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}
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if income > 100 {
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r := &TaxRate{
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start: 100,
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end: 150,
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rate: _range100_150,
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}
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rs = append(rs, r)
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}
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if income > 150 {
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r := &TaxRate{
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start: 150,
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end: 300,
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rate: _range150_300,
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}
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rs = append(rs, r)
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}
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if income > 300 {
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r := &TaxRate{
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start: 300,
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end: 500,
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rate: _range300_500,
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}
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rs = append(rs, r)
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}
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if income > 500 {
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r := &TaxRate{
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start: 500,
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end: 1000,
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rate: _range500_1000,
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}
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rs = append(rs, r)
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}
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if income > 1000 {
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r := &TaxRate{
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start: 1000,
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end: 2000,
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rate: _range1000_2000,
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}
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rs = append(rs, r)
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}
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if income > 2000 {
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r := &TaxRate{
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start: 2000,
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end: 3000,
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rate: _range2000_3000,
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}
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rs = append(rs, r)
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}
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if income > 3000 {
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r := &TaxRate{
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start: 3000,
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end: 1<<31 - 1,
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rate: _range2000_3000,
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}
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rs = append(rs, r)
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}
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return
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}
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// FIXME
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// func mul(x, y float64) (z float64) {
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// f := new(big.Float)
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// xb := big.NewFloat(x)
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// yb := big.NewFloat(y)
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// z, _ = f.Mul(xb, yb).Float64()
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// return
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// }
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