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tiennm99
35f81c6f13
The CF→AWS data migration (closed 2026-05-16) is long done and the tooling isn't wired into any production path. Remove the one-shot binary, its support package, and the migration runbook. In live code, replace 'JS-parity' / 'same shape as JS' / 'cross-runtime KV migration' comments with the real, stable reason for each behavior (wire-format invariant, null-vs-zero distinction, CloudWatch alarm field name, etc.). 24 files touched across lolschedule, loldle, wordle, twentyq, trading, misc, util, server, metrics, ai, keylock. - delete cmd/migrate_cf_data/ - delete internal/migration/ - delete docs/cf-to-aws-migration-runbook.md
60 lines
1.6 KiB
Go
60 lines
1.6 KiB
Go
// Package trading is a paper-trading module for VN stocks. Per-user
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// portfolio + buy/sell at market price + stats with P&L. SQL-based trade
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// history and a retention cron are out of scope today; the current
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// implementation keeps only the live portfolio in KV.
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package trading
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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 renders an integer-rounded amount with dot-thousands separators
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// and a "VND" suffix (e.g. 15000000 -> "15.000.000 VND"). Manual to avoid
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// locale-dependent formatting.
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func FormatVND(n float64) string {
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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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// FormatStock renders an integer share quantity (always whole shares).
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func FormatStock(n float64) string {
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return strconv.FormatInt(int64(math.Floor(n)), 10)
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}
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// FormatPnL renders a signed VND delta + percentage line, e.g.
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// "+1.234 VND (+12.34%)" or "-500.000 VND (-5.00%)". When invested is zero
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// the percentage is reported as 0.00 to avoid division-by-zero.
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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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