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annotate src/entai/entai.go @ 4:4c6bfc90d75c

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rate fix & not consider last date
author pyon@macmini
date Tue, 18 Oct 2016 21:28:25 +0900
parents ca866a38a6a0
children e4066309b04f
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1 /****************************************************************************/
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2 /* Entai.go ( ver 0.3 ) */
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3 /* Last Change: 2016-10-18 Tue 21:26:15. */
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4 /* By T.Mutoh */
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5 /****************************************************************************/
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6
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7 package entai
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8
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9 import (
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10 "fmt"
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11 "strconv"
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12 "time"
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13 )
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14
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15 var rate0s, rate1s []float64
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16 var nyds []time.Time
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17
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18 type Entai struct {
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19 tax int // 税額
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20 ed int // 経過日数
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21 yd0 []int // 各年の 1カ月以内の日数
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22 yd1 []int // 各年の 1カ月超えの日数
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23
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24 due time.Time
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25 paid time.Time
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26 am time.Time
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27 }
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28
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29 func init() {
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30 }
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31
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32 func ( e *Entai ) DefaultRates() {
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33 // 1カ月まで, 1カ月経過後, 元旦
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34 createRates( 4.3, 14.6, "20120101" ) // H24
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35 createRates( 4.3, 14.6, "20130101" ) // H25
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36 createRates( 2.9, 9.2, "20140101" ) // H26
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37 createRates( 2.8, 9.1, "20150101" ) // H27
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38 createRates( 2.8, 9.1, "20160101" ) // H28
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39 createRates( 2.8, 9.1, "20170101" ) // H29 *****
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40
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41 for range nyds {
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42 e.yd0 = append( e.yd0, 0 )
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43 e.yd1 = append( e.yd1, 0 )
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44 }
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45 }
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46
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47 func createRates( r0, r1 float64, nyd string ) {
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48 t, _ := time.Parse( "20060102", nyd )
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49 rate0s = append( rate0s, r0 / 100 )
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50 rate1s = append( rate1s, r1 / 100 )
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51 nyds = append( nyds, t )
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52 }
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53
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54 func ( e *Entai ) AddRates( nyd, r0, r1 string ) error {
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55 rf0, err := strconv.ParseFloat( r0, 64 ); if err != nil {
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56 return err
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57 }
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58 rf1, err := strconv.ParseFloat( r1, 64 ); if err != nil {
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59 return err
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60 }
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61 createRates( rf0, rf1, nyd )
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62 e.yd0 = append( e.yd0, 0 )
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63 e.yd1 = append( e.yd1, 0 )
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64 return nil
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65 }
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66
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67 func ( e Entai ) String() string {
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68 return "Entai....."
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69 }
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70
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71 func ( e Entai ) GetRates() string {
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72 var str string
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73 for i, n := range nyds {
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74 str += fmt.Sprintf( " (H%d) ", n.Year() - 1988 )
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75 str += fmt.Sprintf( "%s :%4.1f / %4.1f\n", n.Format("2006.01.02"), rate0s[i] * 100, rate1s[i] * 100 )
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76 }
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77 return str
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78 }
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79
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80 func ( e *Entai ) countDays() {
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81
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82 for i, _ := range nyds {
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83 e.yd0[i] = 0
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84 e.yd1[i] = 0
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85 }
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86
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87 // 1カ月後の算出
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88 for tmp := e.due; ; {
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89 tmp = tmp.AddDate( 0, 0, 1 )
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90 for i, nyd := range nyds {
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91 if tmp.Year() == nyd.Year() {
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92 e.yd0[i]++
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93 }
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94 }
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95 if tmp.Day() == e.due.Day() {
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96 e.am = tmp
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97 break
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98 }
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99 if tmp == e.due.AddDate( 0, 1, 0 ) {
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100 tmp = tmp.AddDate( 0, 0, -1 )
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101 e.am = tmp
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102 break
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103 }
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104 }
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105
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106 // 過ぎた日数の算出
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107 for i := 1; ; i++ {
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108 tmp := e.due.AddDate( 0, 0, i )
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109 for j, nyd := range nyds {
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110 if tmp.Year() == nyd.Year() {
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111 e.yd1[j]++
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112 }
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113 }
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114 if e.paid.Sub( tmp ) == 0 {
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115 for j, _ := range nyds {
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116 e.yd1[j] -= e.yd0[j]
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117 }
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118 e.ed = i
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119 //e.yd1[len(e.yd1)-1]-- // コメントアウト：最終日を参入しない
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120 //e.ed-- // 同上
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121 break
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122 }
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124 }
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125
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126 func ( e *Entai ) Set( d, p time.Time, g int ) {
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127 e.due, e.paid = d, p
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128 e.tax = g
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129 e.countDays()
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130 }
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131
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132 func ( e *Entai ) Result() ( int, string ) {
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133
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134 /* 税額の前処理 */
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135 if e.tax < 2000 {
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136 return 0, "tax < 2000"
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137 }
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138 e.tax = int( e.tax / 1000 ) * 1000 // 端数処理
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139
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140 /* 本計算 */
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141 var tmp float64
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142 for i, _ := range nyds {
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143 tmp += float64( e.yd0[i] ) * rate0s[i] + float64( e.yd1[i] ) * rate1s[i]
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144 }
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145 tmp *= float64( e.tax ) / 365.0
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146
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147 /* 利息の後処理＆端数処理 */
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148 var intrst int
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149 if tmp < 1000 {
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150 intrst = 0
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151 } else {
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152 intrst = int( tmp / 100 ) * 100
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153 }
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154
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155 /* 追加情報 */
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156 detail := fmt.Sprintf( "%d,%.0f,%d =", e.tax, tmp, e.ed )
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157 for i, _ := range nyds {
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158 tmp1 := float64( e.yd0[i] ) * rate0s[i] * float64( e.tax ) / 365.0
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159 tmp2 := float64( e.yd1[i] ) * rate1s[i] * float64( e.tax ) / 365.0
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160 detail += fmt.Sprintf( ": %d %d (%.1f+%.1f=%.1f)", e.yd0[i], e.yd1[i], tmp1, tmp2, tmp1 + tmp2 )
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161 }
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162
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163 return intrst, detail
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164 }
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165