Update seconds ago function and add tests

pkg/utils/date.go

@@ -7,17 +7,54 @@ import (
 
 func UnixToTimeAgo(timestamp int64) string {
 	now := time.Now().Unix()
-	delta := float64(now - timestamp)
-	// we go seconds, minutes, hours, days, weeks, months, years
-	conversions := []float64{60, 60, 24, 7, 4.34524, 12}
-	labels := []string{"s", "m", "h", "d", "w", "m", "y"}
-	for i, conversion := range conversions {
-		if delta < conversion {
-			return fmt.Sprintf("%d%s", int(delta), labels[i])
+	return formatSecondsAgo(now - timestamp)
+}
+
+const (
+	SECONDS_IN_SECOND = 1
+	SECONDS_IN_MINUTE = 60
+	SECONDS_IN_HOUR   = 3600
+	SECONDS_IN_DAY    = 86400
+	SECONDS_IN_WEEK   = 604800
+	SECONDS_IN_YEAR   = 31536000
+	SECONDS_IN_MONTH  = SECONDS_IN_YEAR / 12
+)
+
+type period struct {
+	label           string
+	secondsInPeriod int64
+}
+
+var periods = []period{
+	{"s", SECONDS_IN_SECOND},
+	{"m", SECONDS_IN_MINUTE},
+	{"h", SECONDS_IN_HOUR},
+	{"d", SECONDS_IN_DAY},
+	{"w", SECONDS_IN_WEEK},
+	// we're using 'm' for both minutes and months which is ambiguous but
+	// disambiguating with another character feels like overkill.
+	{"m", SECONDS_IN_MONTH},
+	{"y", SECONDS_IN_YEAR},
+}
+
+func formatSecondsAgo(secondsAgo int64) string {
+	for i, period := range periods {
+		if i == 0 {
+			continue
+		}
+
+		if secondsAgo < period.secondsInPeriod {
+			return fmt.Sprintf("%d%s",
+				secondsAgo/periods[i-1].secondsInPeriod,
+				periods[i-1].label,
+			)
 		}
-		delta /= conversion
 	}
-	return fmt.Sprintf("%dy", int(delta))
+
+	return fmt.Sprintf("%d%s",
+		secondsAgo/periods[len(periods)-1].secondsInPeriod,
+		periods[len(periods)-1].label,
+	)
 }
 
 // formats the date in a smart way, if the date is today, it will show the time, otherwise it will show the date

pkg/utils/date_test.go

@@ -0,0 +1,97 @@
+package utils
+
+import (
+	"testing"
+)
+
+func TestFormatSecondsAgo(t *testing.T) {
+	tests := []struct {
+		name string
+		args int64
+		want string
+	}{
+		{
+			name: "zero",
+			args: 0,
+			want: "0s",
+		},
+		{
+			name: "one second",
+			args: 1,
+			want: "1s",
+		},
+		{
+			name: "almost a minute",
+			args: 59,
+			want: "59s",
+		},
+		{
+			name: "one minute",
+			args: 60,
+			want: "1m",
+		},
+		{
+			name: "one minute and one second",
+			args: 61,
+			want: "1m",
+		},
+		{
+			name: "almost one hour",
+			args: 3599,
+			want: "59m",
+		},
+		{
+			name: "one hour",
+			args: 3600,
+			want: "1h",
+		},
+		{
+			name: "almost one day",
+			args: 86399,
+			want: "23h",
+		},
+		{
+			name: "one day",
+			args: 86400,
+			want: "1d",
+		},
+		{
+			name: "almost a week",
+			args: 604799,
+			want: "6d",
+		},
+		{
+			name: "one week",
+			args: 604800,
+			want: "1w",
+		},
+		{
+			name: "six months",
+			args: SECONDS_IN_YEAR / 2,
+			want: "6m",
+		},
+		{
+			name: "almost one year",
+			args: 31535999,
+			want: "11m",
+		},
+		{
+			name: "one year",
+			args: SECONDS_IN_YEAR,
+			want: "1y",
+		},
+		{
+			name: "50 years",
+			args: SECONDS_IN_YEAR * 50,
+			want: "50y",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := formatSecondsAgo(tt.args); got != tt.want {
+				t.Errorf("formatSecondsAgo(%d) = %v, want %v", tt.args, got, tt.want)
+			}
+		})
+	}
+}