Refactor to separate each module and report into an individual file

internal/briefing/module_format_helpers.go

@@ -0,0 +1,73 @@
+package briefing
+
+import (
+	"fmt"
+	"time"
+
+	"gitea.maximumdirect.net/eric/weatherreporter/internal/forecast"
+	"gitea.maximumdirect.net/eric/weatherreporter/internal/timeutil"
+)
+
+func rangeLabel(value forecast.Range) string {
+	if value.Min == nil && value.Max == nil {
+		return ""
+	}
+	if value.Min != nil && value.Max != nil {
+		low := roundedInt(value.Min)
+		high := roundedInt(value.Max)
+		if low != nil && high != nil && *low == *high {
+			return fmt.Sprintf("%d", *low)
+		}
+		return fmt.Sprintf("%d-%d", *low, *high)
+	}
+	if value.Min != nil {
+		low := roundedInt(value.Min)
+		return fmt.Sprintf("%d", *low)
+	}
+	high := roundedInt(value.Max)
+	return fmt.Sprintf("%d", *high)
+}
+
+func daypartApparentRangeLabel(value forecast.Range) string {
+	if value.Min == nil && value.Max == nil {
+		return ""
+	}
+	return rangeLabel(value)
+}
+
+func roundedInt(value *float64) *int {
+	if value == nil {
+		return nil
+	}
+	rounded := int(*value + 0.5)
+	if *value < 0 {
+		rounded = int(*value - 0.5)
+	}
+	return &rounded
+}
+
+func timedClockLabel(value *forecast.TimedValue, timezone string) string {
+	if value == nil {
+		return ""
+	}
+	return clockLabel(value.Time, timezone)
+}
+
+func periodClockLabel(period timeutil.Period, timezone string) string {
+	if !period.IsValid() {
+		return ""
+	}
+	return clockLabel(period.Start, timezone) + "-" + clockLabel(period.End, timezone)
+}
+
+func clockLabel(value time.Time, timezone string) string {
+	location, err := timeutil.LoadLocation(timezone)
+	if err != nil {
+		location = time.UTC
+	}
+	label := value.In(location).Format("3 PM")
+	if label == "12 AM" && value.In(location).Minute() == 0 {
+		return "12 AM"
+	}
+	return label
+}