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

internal/adapters/outbound/postgres/alerts_read.go

@@ -0,0 +1,110 @@
+// alerts_read.go executes alert-run, alerts, and reference queries.
+// Layer: adapters/outbound/postgres alerts feature.
+package postgres
+
+import (
+	"context"
+	"database/sql"
+	"errors"
+	"fmt"
+
+	"gitea.maximumdirect.net/ejr/weatherfeeder/model"
+)
+
+func (r *Repository) LatestAlertRun(ctx context.Context) (*model.WeatherAlertRun, error) {
+	if r == nil || r.db == nil {
+		return nil, fmt.Errorf("postgres repository is not configured")
+	}
+
+	var row alertRunParentRow
+	err := r.db.QueryRowContext(ctx, queryLatestAlertRun).Scan(
+		&row.EventID,
+		&row.LocationID,
+		&row.LocationName,
+		&row.AsOf,
+		&row.Latitude,
+		&row.Longitude,
+	)
+	if errors.Is(err, sql.ErrNoRows) {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, fmt.Errorf("query latest alert run: %w", err)
+	}
+
+	run := mapAlertRunParentRow(row)
+
+	alerts, err := r.loadAlerts(ctx, row.EventID)
+	if err != nil {
+		return nil, err
+	}
+	run.Alerts = alerts
+
+	return &run, nil
+}
+
+func (r *Repository) loadAlerts(ctx context.Context, eventID string) ([]model.WeatherAlert, error) {
+	alertsRows, err := r.db.QueryContext(ctx, queryAlerts, eventID)
+	if err != nil {
+		return nil, fmt.Errorf("query alerts: %w", err)
+	}
+	defer alertsRows.Close()
+
+	indexedAlerts := make([]indexedAlert, 0)
+	for alertsRows.Next() {
+		var row alertRow
+		if err := alertsRows.Scan(
+			&row.AlertIndex,
+			&row.AlertID,
+			&row.Event,
+			&row.Headline,
+			&row.Severity,
+			&row.Urgency,
+			&row.Certainty,
+			&row.Status,
+			&row.MessageType,
+			&row.Category,
+			&row.Response,
+			&row.Description,
+			&row.Instruction,
+			&row.Sent,
+			&row.Effective,
+			&row.Onset,
+			&row.Expires,
+			&row.AreaDescription,
+			&row.SenderName,
+		); err != nil {
+			return nil, fmt.Errorf("scan alerts row: %w", err)
+		}
+		indexedAlerts = append(indexedAlerts, mapAlertRow(row))
+	}
+	if err := alertsRows.Err(); err != nil {
+		return nil, fmt.Errorf("iterate alerts rows: %w", err)
+	}
+
+	referenceRows, err := r.db.QueryContext(ctx, queryAlertReferences, eventID)
+	if err != nil {
+		return nil, fmt.Errorf("query alert references: %w", err)
+	}
+	defer referenceRows.Close()
+
+	indexedReferences := make([]indexedAlertReference, 0)
+	for referenceRows.Next() {
+		var row alertReferenceRow
+		if err := referenceRows.Scan(
+			&row.AlertIndex,
+			&row.ID,
+			&row.Identifier,
+			&row.Sender,
+			&row.Sent,
+		); err != nil {
+			return nil, fmt.Errorf("scan alert reference row: %w", err)
+		}
+		indexedReferences = append(indexedReferences, mapAlertReferenceRow(row))
+	}
+	if err := referenceRows.Err(); err != nil {
+		return nil, fmt.Errorf("iterate alert reference rows: %w", err)
+	}
+
+	return attachAlertReferences(indexedAlerts, indexedReferences), nil
+}