first commit

bot/format.go

@@ -0,0 +1,81 @@
+package bot
+
+import (
+	"fmt"
+	"strings"
+)
+
+const miToKM = 1.60934
+
+// formatDist formats a KM value in the user's preferred unit.
+func formatDist(km float64, unit string) string {
+	if unit == "miles" {
+		return fmt.Sprintf("%.1f mi", km/miToKM)
+	}
+	return fmt.Sprintf("%.1f km", km)
+}
+
+// distanceComparison returns a fun contextual comparison string.
+func distanceComparison(km float64) string {
+	switch {
+	case km >= 384400:
+		return "You've cycled **to the Moon!** 🌕"
+	case km >= 40075:
+		return fmt.Sprintf("That's **%.1f laps around the Earth!** 🌏", km/40075)
+	case km >= 1892:
+		return fmt.Sprintf("That's like riding **London → Rome** (%.0f%%)! 🗺️", km/1892*100)
+	case km >= 500:
+		return fmt.Sprintf("That's like riding **Amsterdam → Paris** and back (%.0f%%)! 🇫🇷", km/830*100)
+	default:
+		return "Keep pedalling — the KMs are adding up! 💪"
+	}
+}
+
+// progressBar renders a simple ASCII progress bar.
+func progressBar(current, max float64, width int) string {
+	if max <= 0 {
+		return ""
+	}
+	pct := current / max
+	if pct > 1 {
+		pct = 1
+	}
+	filled := int(pct * float64(width))
+	bar := ""
+	for i := 0; i < width; i++ {
+		if i < filled {
+			bar += "█"
+		} else {
+			bar += "░"
+		}
+	}
+	return fmt.Sprintf("[%s] %.0f%%", bar, pct*100)
+}
+
+// fmtKM formats a KM value with comma separators (e.g. 5243.3 → "5,243.3").
+// decimals controls how many decimal places to show.
+func fmtKM(km float64, decimals int) string {
+	s := fmt.Sprintf(fmt.Sprintf("%%.%df", decimals), km)
+	parts := strings.SplitN(s, ".", 2)
+	intPart := parts[0]
+
+	n := len(intPart)
+	var out []byte
+	for i := 0; i < n; i++ {
+		if i > 0 && (n-i)%3 == 0 {
+			out = append(out, ',')
+		}
+		out = append(out, intPart[i])
+	}
+	if len(parts) > 1 {
+		return string(out) + "." + parts[1]
+	}
+	return string(out)
+}
+
+func plural(n int) string {
+	if n == 1 {
+		return ""
+	}
+	return "s"
+}