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comparison src/entai/entai.go @ 0:de451fa0c9cd

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golang repository.
author pyon@macmini
date Sat, 01 Oct 2016 11:16:31 +0900
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children 451c99c1d9de
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-1:000000000000 0:de451fa0c9cd
1 /****************************************************************************/
2 /* Entai.go ( ver 0.1 ) */
3 /* Last Change: 2016-09-30 Fri 20:15:52. */
4 /****************************************************************************/
5
6 package entai
7
8 import (
9 "fmt"
10 "time"
11 )
12
13 var rate0s, rate1s []float64
14 var nyds []time.Time
15
16 type Entai struct {
17 tax int // 税額
18 ed int // 経過日数
19 yd0 []int // 各年の 1カ月以内の日数
20 yd1 []int // 各年の 1カ月超えの日数
21
22 due time.Time
23 paid time.Time
24 am time.Time
25 }
26
27 func init() {
28 // 1カ月まで, 1カ月経過後, 元旦
29 createRates( 4.3, 14.6, "20120101" ) // H24
30 createRates( 4.3, 14.6, "20130101" ) // H25
31 createRates( 4.3, 14.6, "20140101" ) // H26
32 createRates( 2.9, 9.2, "20150101" ) // H27
33 createRates( 2.8, 9.1, "20160101" ) // H28
34 }
35
36 func createRates( r0, r1 float64, y string ) {
37 t, _ := time.Parse( "20060102", y )
38 rate0s = append( rate0s, r0 / 100 )
39 rate1s = append( rate1s, r1 / 100 )
40 nyds = append( nyds, t )
41 }
42
43 func ( e Entai ) String() string {
44 return "Entai....."
45 }
46
47 func ( e Entai ) GetRate() string {
48 var str string
49 for i, n := range nyds {
50 str += fmt.Sprintf( " (H%d) ", n.Year() - 1988 )
51 str += fmt.Sprintf( "%s :%4.1f / %4.1f\n", n.Format("2006.01.02"), rate0s[i] * 100, rate1s[i] * 100 )
52 }
53 return str
54 }
55
56 func ( e *Entai ) countDays() {
57
58 for range nyds {
59 e.yd0 = append( e.yd0, 0 )
60 e.yd1 = append( e.yd1, 0 )
61 }
62
63 // 1カ月後の算出
64 for tmp := e.due; ; {
65 tmp = tmp.AddDate( 0, 0, 1 )
66 for i, nyd := range nyds {
67 if tmp.Year() == nyd.Year() {
68 e.yd0[i]++
69 }
70 }
71 if tmp.Day() == e.due.Day() {
72 e.am = tmp
73 break
74 }
75 }
76
77 // 過ぎた日数の算出
78 for i := 1; ; i++ {
79 tmp := e.due.AddDate( 0, 0, i )
80 for j, nyd := range nyds {
81 if tmp.Year() == nyd.Year() {
82 e.yd1[j]++
83 }
84 }
85 if e.paid.Sub( tmp ) == 0 {
86 for j, _ := range nyds {
87 e.yd1[j] -= e.yd0[j]
88 }
89 e.yd1[len(e.yd1)-1]--
90 e.ed = i - 1
91 break
92 }
93 }
94 }
95
96 func ( e *Entai ) Set( d, p time.Time, g int ) {
97 e.due, e.paid = d, p
98 e.tax = g
99 e.countDays()
100 }
101
102 func ( e *Entai ) Result() ( int, string ) {
103
104 /* 税額の前処理 */
105 if e.tax < 2000 {
106 return 0, "tax < 2000"
107 }
108 e.tax = int( e.tax / 1000 * 1000 ) // 端数処理
109
110 /* 本計算 */
111 var tmp float64
112 for i, _ := range nyds {
113 tmp += float64(e.yd0[i]) * rate0s[i] + float64(e.yd1[i]) * rate1s[i]
114 }
115 tmp *= float64(e.tax) / 365.0
116
117 /* 利息の後処理＆端数処理 */
118 var intrst int
119 if tmp < 1000 {
120 intrst = 0
121 } else {
122 intrst = int( tmp / 100 ) * 100
123 }
124
125 /* 追加情報 */
126 info := fmt.Sprintf( "%.2f,%d =", tmp, e.ed )
127 for i, _ := range nyds {
128 info += fmt.Sprintf( ": %d %d ", e.yd0[i], e.yd1[i] )
129 }
130
131 return intrst, info
132 }
133