Add Daily briefing JSON generation

internal/app/app.go

@@ -4,9 +4,11 @@ package app
 import (
 	"context"
 	"fmt"
+	"path/filepath"
 	"time"
 
 	"gitea.maximumdirect.net/eric/weatherreporter/internal/adapters/weatherapi"
+	"gitea.maximumdirect.net/eric/weatherreporter/internal/briefing"
 	"gitea.maximumdirect.net/eric/weatherreporter/internal/config"
 	"gitea.maximumdirect.net/eric/weatherreporter/internal/forecast"
 	"gitea.maximumdirect.net/eric/weatherreporter/internal/report"
@@ -49,9 +51,28 @@ type FetchBundleRequest struct {
 	OutputPath string
 }
 
+type DailyBriefingRequest struct {
+	Config     config.Config
+	Resolved   report.Resolved
+	OutputPath string
+}
+
+type DailyBriefingResult struct {
+	Package    briefing.Package
+	OutputPath string
+}
+
 func Generate(ctx context.Context, req GenerateRequest) error {
-	_ = ctx
-	if _, err := ResolveGenerate(req, time.Now()); err != nil {
+	resolved, err := ResolveGenerate(req, time.Now())
+	if err != nil {
+		return err
+	}
+	if resolved.Definition.ID == report.DailyToday {
+		_, err := GenerateDailyBriefing(ctx, DailyBriefingRequest{
+			Config:     req.Config,
+			Resolved:   resolved,
+			OutputPath: req.OutputPath,
+		})
 		return err
 	}
 	return fmt.Errorf("generate is not implemented")
@@ -151,3 +172,53 @@ func FetchAndSaveBundle(ctx context.Context, req FetchBundleRequest) (*forecast.
 	}
 	return bundle, nil
 }
+
+func GenerateDailyBriefing(ctx context.Context, req DailyBriefingRequest) (*DailyBriefingResult, error) {
+	bundle, err := FetchBundle(ctx, FetchBundleRequest{Config: req.Config})
+	if err != nil {
+		return nil, err
+	}
+	pkg, err := BuildDailyBriefing(req, bundle)
+	if err != nil {
+		return nil, err
+	}
+	outputPath := req.OutputPath
+	if outputPath == "" {
+		outputPath = defaultBriefingPath(req.Config, req.Resolved)
+	}
+	if err := briefing.Save(outputPath, pkg); err != nil {
+		return nil, err
+	}
+	return &DailyBriefingResult{Package: pkg, OutputPath: outputPath}, nil
+}
+
+func BuildDailyBriefing(req DailyBriefingRequest, bundle *forecast.Bundle) (briefing.Package, error) {
+	location, err := timeutil.LoadLocation(req.Config.WeatherAPI.Timezone)
+	if err != nil {
+		return briefing.Package{}, err
+	}
+	dayparts := make([]forecast.DaypartDefinition, 0, len(req.Config.Dayparts))
+	for _, daypart := range req.Config.Dayparts {
+		dayparts = append(dayparts, forecast.DaypartDefinition{
+			Name:  daypart.Name,
+			Start: daypart.Start,
+			End:   daypart.End,
+		})
+	}
+	summary, err := forecast.BuildDailySummary(bundle, req.Resolved.ValidPeriod.Start, location, dayparts)
+	if err != nil {
+		return briefing.Package{}, err
+	}
+	return briefing.BuildDaily(briefing.BuildContext{
+		Resolved: req.Resolved,
+		Bundle:   bundle,
+		Units:    req.Config.WeatherAPI.Units,
+		Timezone: req.Config.WeatherAPI.Timezone,
+	}, summary)
+}
+
+func defaultBriefingPath(cfg config.Config, resolved report.Resolved) string {
+	validDate := resolved.ValidPeriod.Start.Format("2006-01-02")
+	filename := validDate + "." + string(resolved.Definition.ID) + ".briefing.json"
+	return filepath.Join(cfg.Workspace.Root, cfg.Workspace.SnapshotsDir, "daily", validDate, filename)
+}