Add Daily recent changes comparison

internal/app/app.go

@@ -11,6 +11,7 @@ import (
 	"gitea.maximumdirect.net/eric/weatherreporter/internal/adapters/scriptorium"
 	"gitea.maximumdirect.net/eric/weatherreporter/internal/adapters/weatherapi"
 	"gitea.maximumdirect.net/eric/weatherreporter/internal/briefing"
+	"gitea.maximumdirect.net/eric/weatherreporter/internal/changes"
 	"gitea.maximumdirect.net/eric/weatherreporter/internal/config"
 	"gitea.maximumdirect.net/eric/weatherreporter/internal/forecast"
 	"gitea.maximumdirect.net/eric/weatherreporter/internal/promptinput"
@@ -85,6 +86,7 @@ type DailyReportResult struct {
 	Metadata        state.Metadata
 	MetadataPath    string
 	PriorSnapshot   *state.PriorSnapshot
+	RecentChanges   []changes.Change
 	RenderResult    *scriptorium.RenderResult
 	RunResult       *scriptorium.RunResult
 }
@@ -267,7 +269,11 @@ func GenerateDailyReport(ctx context.Context, req DailyReportRequest) (*DailyRep
 		return nil, err
 	}
 
-	dataPackage, err := promptinput.Build(briefingPackage)
+	recentChanges, err := dailyRecentChanges(ctx, store, priorSnapshot, briefingPackage, req.Config.RecentChange)
+	if err != nil {
+		return nil, err
+	}
+	dataPackage, err := promptinput.BuildWithRecentChanges(briefingPackage, recentChanges)
 	if err != nil {
 		return nil, err
 	}
@@ -352,6 +358,7 @@ func GenerateDailyReport(ctx context.Context, req DailyReportRequest) (*DailyRep
 		Metadata:        metadata,
 		MetadataPath:    metadataPath,
 		PriorSnapshot:   priorSnapshot,
+		RecentChanges:   recentChanges,
 		RenderResult:    renderResult,
 		RunResult:       runResult,
 	}, nil
@@ -386,6 +393,22 @@ func defaultStore(cfg config.Config) (*state.FilesystemStore, error) {
 	return state.NewFilesystemStore(cfg.Workspace)
 }
 
+func dailyRecentChanges(ctx context.Context, store state.Store, priorSnapshot *state.PriorSnapshot, current briefing.Package, cfg config.RecentChangeConfig) ([]changes.Change, error) {
+	if priorSnapshot == nil {
+		return nil, nil
+	}
+	previous, err := store.LoadBriefing(ctx, priorSnapshot.BriefingPath)
+	if err != nil {
+		return nil, err
+	}
+	return changes.CompareDaily(previous, current, changes.Thresholds{
+		TemperatureDegrees:       cfg.TemperatureDegrees,
+		PrecipProbabilityPoints:  cfg.PrecipProbabilityPoints,
+		WindGustMilesPerHour:     cfg.WindGustMilesPerHour,
+		PrecipTimingShiftMinutes: cfg.PrecipTimingShiftMinutes,
+	})
+}
+
 func copyFileAtomic(source string, target string) error {
 	data, err := os.ReadFile(source)
 	if err != nil {