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tiennm99
cf620a257e
Correct comments that described the retired webhook transport, a removed /cron route, the old KV store and wrapper types, and behaviour that has since changed; drop plan and review labels; reword two startup log lines that overstated or misnamed what they report.
65 lines
1.5 KiB
Go
65 lines
1.5 KiB
Go
package gold
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import (
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"math"
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"strconv"
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"strings"
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)
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// FormatVND rounds n to whole dong and renders it with dot thousands
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// separators, e.g. "1.234.567 VND", or "invalid VND" when n is not finite or
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// does not fit an int64.
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func FormatVND(n float64) string {
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if math.IsNaN(n) || math.IsInf(n, 0) || n > float64(math.MaxInt64) || n < float64(math.MinInt64) {
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return "invalid VND"
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}
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rounded := int64(math.Round(n))
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abs := strconv.FormatInt(absInt64(rounded), 10)
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var sb strings.Builder
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if rounded < 0 {
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sb.WriteByte('-')
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}
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for i := 0; i < len(abs); i++ {
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if i > 0 && (len(abs)-i)%3 == 0 {
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sb.WriteByte('.')
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}
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sb.WriteByte(abs[i])
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}
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sb.WriteString(" VND")
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return sb.String()
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}
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// FormatLuong renders a lượng quantity with up to four decimals and no
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// trailing zeros.
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func FormatLuong(n float64) string {
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s := strconv.FormatFloat(n, 'f', 4, 64)
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s = strings.TrimRight(s, "0")
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s = strings.TrimRight(s, ".")
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if s == "" || s == "-0" {
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return "0"
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}
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return s
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}
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// FormatPnL renders the gain of currentValue over invested as a signed VND
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// amount plus percentage. The percentage is 0 when nothing was invested.
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func FormatPnL(currentValue, invested float64) string {
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diff := currentValue - invested
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pct := 0.0
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if invested > 0 {
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pct = (diff / invested) * 100
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}
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sign := ""
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if diff >= 0 {
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sign = "+"
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}
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return sign + FormatVND(diff) + " (" + sign + strconv.FormatFloat(pct, 'f', 2, 64) + "%)"
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}
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func absInt64(n int64) int64 {
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if n < 0 {
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return -n
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}
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return n
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}
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