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1 /****************************************************************************/
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2 /* Entai.go ( ver 0.1 ) */
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3 /* Last Change: 2016-09-30 Fri 20:15:52. */
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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 }
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35
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36 func createRates( r0, r1 float64, y string ) {
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37 t, _ := time.Parse( "20060102", y )
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38 rate0s = append( rate0s, r0 / 100 )
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39 rate1s = append( rate1s, r1 / 100 )
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40 nyds = append( nyds, t )
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41 }
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42
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43 func ( e Entai ) String() string {
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44 return "Entai....."
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45 }
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46
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47 func ( e Entai ) GetRate() string {
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48 var str string
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49 for i, n := range nyds {
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50 str += fmt.Sprintf( " (H%d) ", n.Year() - 1988 )
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51 str += fmt.Sprintf( "%s :%4.1f / %4.1f\n", n.Format("2006.01.02"), rate0s[i] * 100, rate1s[i] * 100 )
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52 }
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53 return str
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54 }
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55
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56 func ( e *Entai ) countDays() {
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57
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58 for range nyds {
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59 e.yd0 = append( e.yd0, 0 )
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60 e.yd1 = append( e.yd1, 0 )
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61 }
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62
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63 // 1カ月後の算出
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64 for tmp := e.due; ; {
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65 tmp = tmp.AddDate( 0, 0, 1 )
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66 for i, nyd := range nyds {
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67 if tmp.Year() == nyd.Year() {
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68 e.yd0[i]++
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69 }
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70 }
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71 if tmp.Day() == e.due.Day() {
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72 e.am = tmp
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73 break
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74 }
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75 }
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76
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77 // 過ぎた日数の算出
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78 for i := 1; ; i++ {
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79 tmp := e.due.AddDate( 0, 0, i )
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80 for j, nyd := range nyds {
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81 if tmp.Year() == nyd.Year() {
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82 e.yd1[j]++
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83 }
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84 }
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85 if e.paid.Sub( tmp ) == 0 {
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86 for j, _ := range nyds {
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87 e.yd1[j] -= e.yd0[j]
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88 }
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89 e.yd1[len(e.yd1)-1]--
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90 e.ed = i - 1
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91 break
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92 }
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93 }
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94 }
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95
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96 func ( e *Entai ) Set( d, p time.Time, g int ) {
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97 e.due, e.paid = d, p
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98 e.tax = g
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99 e.countDays()
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100 }
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101
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102 func ( e *Entai ) Result() ( int, string ) {
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103
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104 /* 税額の前処理 */
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105 if e.tax < 2000 {
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106 return 0, "tax < 2000"
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107 }
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108 e.tax = int( e.tax / 1000 * 1000 ) // 端数処理
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109
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110 /* 本計算 */
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111 var tmp float64
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112 for i, _ := range nyds {
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113 tmp += float64(e.yd0[i]) * rate0s[i] + float64(e.yd1[i]) * rate1s[i]
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114 }
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115 tmp *= float64(e.tax) / 365.0
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116
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117 /* 利息の後処理＆端数処理 */
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118 var intrst int
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119 if tmp < 1000 {
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120 intrst = 0
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121 } else {
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122 intrst = int( tmp / 100 ) * 100
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123 }
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124
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125 /* 追加情報 */
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126 info := fmt.Sprintf( "%.2f,%d =", tmp, e.ed )
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127 for i, _ := range nyds {
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128 info += fmt.Sprintf( ": %d %d ", e.yd0[i], e.yd1[i] )
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129 }
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130
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131 return intrst, info
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132 }
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133
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