forked from x/icebergs
87 lines
3.1 KiB
Go
87 lines
3.1 KiB
Go
package team
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import (
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"math"
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ice "shylinux.com/x/icebergs"
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"shylinux.com/x/icebergs/base/web/html"
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kit "shylinux.com/x/toolkits"
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)
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const LOAN = "loan"
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func init() {
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const (
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YEAR = "year"
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RATE = "rate"
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MONTH = "month"
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PAYMENT = "payment"
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PRESENT = "present"
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INTEREST = "interest"
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INTERESTS = "interests"
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PRESENTS = "presents"
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)
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Index.MergeCommands(ice.Commands{
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LOAN: {Name: "loan auto loan1 loan2", Help: "分期贷款", Meta: kit.Dict(
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ice.CTX_TRANS, kit.Dict(html.INPUT, kit.Dict(
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YEAR, "年数", RATE, "利率", MONTH, "期数", PAYMENT, "月供",
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PRESENT, "本金", INTEREST, "利息", INTERESTS, "累积利息", PRESENTS, "还欠本金",
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AMOUNT, "累积还款",
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)),
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), Actions: ice.MergeActions(ice.Actions{
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"loan1": {Name: "load present=300 year=30 rate=4.2", Help: "等额本息", Hand: func(m *ice.Message, arg ...string) {
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//〔贷款本金×月利率×(1＋月利率)^还款月数〕÷〔(1＋月利率)^还款月数 - 1〕
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number, rate := kit.Float(m.Option(YEAR))*12, kit.Float(m.Option(RATE))/100/12
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present := kit.Float(m.Option(PRESENT)) * 10000
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pow := math.Pow((1 + rate), number)
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p := present * rate * pow / (pow - 1)
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var interests, presents float64
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presents = present
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for i := float64(0); i < number; i++ {
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_p := presents * rate
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interests += _p
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presents -= (present / number)
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m.Push(MONTH, kit.Int(i+1)).Push(PAYMENT, p)
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m.Push(PRESENT, p-_p).Push(INTEREST, _p)
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m.Push(INTERESTS, interests)
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m.Push(PRESENTS, presents)
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m.Push(AMOUNT, p*(i+1))
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}
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m.Status(kit.Dict(
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PAYMENT, kit.Format("%0.2f 元", p),
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PRESENT, kit.Format("%0.2f 万", present/10000),
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INTEREST, kit.Format("%0.2f 万", p*number/10000-present/10000),
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AMOUNT, kit.Format("%0.2f 万", p*number/10000),
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MONTH, kit.Format("%v 期", number),
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))
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}},
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"loan2": {Name: "load present=300 year=30 rate=4.2", Help: "等额本金", Hand: func(m *ice.Message, arg ...string) {
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// 每月还款金额 =（贷款本金 ÷ 还款月数）+（本金 — 已归还本金累计额）×每月利率
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present := kit.Float(m.Option(PRESENT)) * 10000
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number, rate := kit.Float(m.Option(YEAR))*12, kit.Float(m.Option(RATE))/100/12
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var interests, presents, amount, payment float64
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presents = present
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for i := float64(0); i < number; i++ {
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p := present/number + (present-i*(present/number))*rate
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interests += (present - i*(present/number)) * rate
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presents -= present / number
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amount += p
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kit.If(i == 0, func() { payment = p })
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m.Push(MONTH, kit.Int(i+1)).Push(PAYMENT, p)
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m.Push(PRESENT, present/number).Push(INTEREST, (present-i*(present/number))*rate)
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m.Push(INTERESTS, interests)
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m.Push(PRESENTS, presents)
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m.Push(AMOUNT, amount)
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}
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m.Status(kit.Dict(
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PAYMENT, kit.Format("%0.2f 元", payment),
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PRESENT, kit.Format("%0.2f 万", present/10000),
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INTEREST, kit.Format("%0.2f 万", amount/10000-present/10000),
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AMOUNT, kit.Format("%0.2f 万", amount/10000),
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MONTH, kit.Format("%v 期", number),
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))
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}},
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})},
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})
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}
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