Refactored the application structure to better separate concerns between files and packages

internal/adapters/outbound/postgres/forecast_read.go

@@ -0,0 +1,96 @@
+// forecast_read.go executes hourly forecast and period queries.
+// Layer: adapters/outbound/postgres forecast feature.
+package postgres
+
+import (
+	"context"
+	"database/sql"
+	"errors"
+	"fmt"
+
+	"gitea.maximumdirect.net/ejr/weatherfeeder/model"
+)
+
+func (r *Repository) LatestHourlyForecast(ctx context.Context) (*model.WeatherForecastRun, error) {
+	if r == nil || r.db == nil {
+		return nil, fmt.Errorf("postgres repository is not configured")
+	}
+
+	var row forecastParentRow
+	err := r.db.QueryRowContext(ctx, queryLatestHourlyForecast).Scan(
+		&row.EventID,
+		&row.LocationID,
+		&row.LocationName,
+		&row.IssuedAt,
+		&row.UpdatedAt,
+		&row.Product,
+		&row.Latitude,
+		&row.Longitude,
+		&row.ElevationMeters,
+	)
+	if errors.Is(err, sql.ErrNoRows) {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, fmt.Errorf("query latest hourly forecast: %w", err)
+	}
+
+	run := mapForecastParentRow(row)
+
+	periods, err := r.loadForecastPeriods(ctx, row.EventID)
+	if err != nil {
+		return nil, err
+	}
+	run.Periods = periods
+
+	return &run, nil
+}
+
+func (r *Repository) loadForecastPeriods(ctx context.Context, eventID string) ([]model.WeatherForecastPeriod, error) {
+	rows, err := r.db.QueryContext(ctx, queryForecastPeriods, eventID)
+	if err != nil {
+		return nil, fmt.Errorf("query forecast periods: %w", err)
+	}
+	defer rows.Close()
+
+	out := make([]model.WeatherForecastPeriod, 0)
+	for rows.Next() {
+		var row forecastPeriodRow
+		if err := rows.Scan(
+			&row.PeriodIndex,
+			&row.StartTime,
+			&row.EndTime,
+			&row.Name,
+			&row.IsDay,
+			&row.ConditionCode,
+			&row.ConditionText,
+			&row.ProviderRawDescription,
+			&row.TextDescription,
+			&row.DetailedText,
+			&row.IconURL,
+			&row.TemperatureC,
+			&row.TemperatureCMin,
+			&row.TemperatureCMax,
+			&row.DewpointC,
+			&row.RelativeHumidityPercent,
+			&row.WindDirectionDegrees,
+			&row.WindSpeedKmh,
+			&row.WindGustKmh,
+			&row.BarometricPressurePa,
+			&row.VisibilityMeters,
+			&row.ApparentTemperatureC,
+			&row.CloudCoverPercent,
+			&row.ProbabilityOfPrecipitationPercent,
+			&row.PrecipitationAmountMM,
+			&row.SnowfallDepthMM,
+			&row.UVIndex,
+		); err != nil {
+			return nil, fmt.Errorf("scan forecast period row: %w", err)
+		}
+		out = append(out, mapForecastPeriodRow(row))
+	}
+	if err := rows.Err(); err != nil {
+		return nil, fmt.Errorf("iterate forecast period rows: %w", err)
+	}
+	return out, nil
+}