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1 /****************************************************************************/
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2
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2 /* Entai.go ( ver 0.2 ) */
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3 /* Last Change: 2016-10-07 Fri 18:32:08. */
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4 /****************************************************************************/
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5
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6 package entai
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7
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8 import (
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9 "fmt"
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10 "time"
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11 )
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12
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13 var rate0s, rate1s []float64
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14 var nyds []time.Time
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15
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16 type Entai struct {
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17 tax int // 税額
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18 ed int // 経過日数
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19 yd0 []int // 各年の 1カ月以内の日数
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20 yd1 []int // 各年の 1カ月超えの日数
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21
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22 due time.Time
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23 paid time.Time
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24 am time.Time
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25 }
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26
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27 func init() {
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28 // 1カ月まで, 1カ月経過後, 元旦
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29 createRates( 4.3, 14.6, "20120101" ) // H24
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30 createRates( 4.3, 14.6, "20130101" ) // H25
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31 createRates( 4.3, 14.6, "20140101" ) // H26
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32 createRates( 2.9, 9.2, "20150101" ) // H27
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33 createRates( 2.8, 9.1, "20160101" ) // H28
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34 createRates( 2.8, 9.1, "20170101" ) // H29 *****
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35 }
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36
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37 func createRates( r0, r1 float64, nyd string ) {
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38 t, _ := time.Parse( "20060102", nyd )
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39 rate0s = append( rate0s, r0 / 100 )
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40 rate1s = append( rate1s, r1 / 100 )
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41 nyds = append( nyds, t )
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42 }
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43
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44 func ( e Entai ) String() string {
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45 return "Entai....."
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46 }
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47
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48 func ( e Entai ) GetRate() string {
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49 var str string
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50 for i, n := range nyds {
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51 str += fmt.Sprintf( " (H%d) ", n.Year() - 1988 )
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52 str += fmt.Sprintf( "%s :%4.1f / %4.1f\n", n.Format("2006.01.02"), rate0s[i] * 100, rate1s[i] * 100 )
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53 }
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54 return str
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55 }
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56
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57 func ( e *Entai ) countDays() {
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58
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59 for i, _ := range nyds {
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60 e.yd0[i] = 0
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61 e.yd1[i] = 0
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0
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62 }
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63
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64 // 1カ月後の算出
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65 for tmp := e.due; ; {
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66 tmp = tmp.AddDate( 0, 0, 1 )
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67 for i, nyd := range nyds {
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68 if tmp.Year() == nyd.Year() {
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69 e.yd0[i]++
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70 }
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71 }
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72 if tmp.Day() == e.due.Day() {
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73 e.am = tmp
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74 break
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75 }
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76 if tmp == e.due.AddDate( 0, 1, 0 ) {
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77 tmp = tmp.AddDate( 0, 0, -1 )
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78 e.am = tmp
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79 break
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80 }
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0
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81 }
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82
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83 // 過ぎた日数の算出
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84 for i := 1; ; i++ {
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85 tmp := e.due.AddDate( 0, 0, i )
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86 for j, nyd := range nyds {
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87 if tmp.Year() == nyd.Year() {
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88 e.yd1[j]++
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89 }
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90 }
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91 if e.paid.Sub( tmp ) == 0 {
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92 for j, _ := range nyds {
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93 e.yd1[j] -= e.yd0[j]
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94 }
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95 e.yd1[len(e.yd1)-1]--
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96 e.ed = i - 1
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97 break
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98 }
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99 }
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100 }
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101
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102 func ( e *Entai ) Create() {
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103 for range nyds {
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104 e.yd0 = append( e.yd0, 0 )
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105 e.yd1 = append( e.yd1, 0 )
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106 }
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107 }
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108
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109 func ( e *Entai ) Set( d, p time.Time, g int ) {
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110 e.due, e.paid = d, p
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111 e.tax = g
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112 e.countDays()
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113 }
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114
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115 func ( e *Entai ) Result() ( int, string ) {
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116
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117 /* 税額の前処理 */
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118 if e.tax < 2000 {
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119 return 0, "tax < 2000"
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120 }
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121 e.tax = int( e.tax / 1000 * 1000 ) // 端数処理
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122
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123 /* 本計算 */
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124 var tmp float64
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125 for i, _ := range nyds {
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126 tmp += float64( e.yd0[i] ) * rate0s[i] + float64( e.yd1[i] ) * rate1s[i]
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127 }
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128 tmp *= float64( e.tax ) / 365.0
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129
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130 /* 利息の後処理＆端数処理 */
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131 var intrst int
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132 if tmp < 1000 {
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133 intrst = 0
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134 } else {
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135 intrst = int( tmp / 100 ) * 100
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136 }
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137
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138 /* 追加情報 */
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139 detail := fmt.Sprintf( "%d,%.0f,%d =", e.tax, tmp, e.ed )
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140 for i, _ := range nyds {
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141 tmp1 := float64( e.yd0[i] ) * rate0s[i] * float64( e.tax ) / 365.0
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142 tmp2 := float64( e.yd1[i] ) * rate1s[i] * float64( e.tax ) / 365.0
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143 detail += fmt.Sprintf( ": %d %d (%.0f+%.0f=%.0f)", e.yd0[i], e.yd1[i], tmp1, tmp2, tmp1 + tmp2 )
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144 }
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145
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146 return intrst, detail
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147 }
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