// Package app owns application orchestration and top-level use cases.
package app

import (
	"context"
	"errors"
	"fmt"
	"path/filepath"
	"time"

	distributoradapter "gitea.maximumdirect.net/eric/weatherreporter/internal/adapters/distributor"
	"gitea.maximumdirect.net/eric/weatherreporter/internal/briefing"
	"gitea.maximumdirect.net/eric/weatherreporter/internal/collect"
	"gitea.maximumdirect.net/eric/weatherreporter/internal/config"
	"gitea.maximumdirect.net/eric/weatherreporter/internal/facts"
	"gitea.maximumdirect.net/eric/weatherreporter/internal/forecast"
	"gitea.maximumdirect.net/eric/weatherreporter/internal/module"
	"gitea.maximumdirect.net/eric/weatherreporter/internal/promptdebug"
	"gitea.maximumdirect.net/eric/weatherreporter/internal/promptexec"
	"gitea.maximumdirect.net/eric/weatherreporter/internal/promptinput"
	"gitea.maximumdirect.net/eric/weatherreporter/internal/report"
	"gitea.maximumdirect.net/eric/weatherreporter/internal/timeutil"
	"gitea.maximumdirect.net/eric/weatherreporter/internal/weatherdata"
)

type ReportKind string

const (
	ReportDaily    ReportKind = ReportKind(report.CommandNameDaily)
	ReportToday    ReportKind = ReportKind(report.CommandNameToday)
	ReportTomorrow ReportKind = ReportKind(report.CommandNameTomorrow)
	ReportHourly   ReportKind = ReportKind(report.CommandNameHourly)
)

type BatchKind string

const (
	BatchMorning BatchKind = BatchKind(report.BatchNameMorning)
	BatchEvening BatchKind = BatchKind(report.BatchNameEvening)
)

type GenerateRequest struct {
	Config      config.Config
	Report      ReportKind
	WorkingDir  string
	OutputPath  string
	LLMDebugDir string
	Now         time.Time
	Date        time.Time
	Collector   Collector
	Notifier    Notifier
	Executor    promptexec.Executor
}

type BatchRequest struct {
	Config      config.Config
	Batch       BatchKind
	Now         time.Time
	WorkingDir  string
	OutputDir   string
	LLMDebugDir string
	Collector   Collector
	Executor    promptexec.Executor
	Notifier    Notifier
}

type ModuleSnapshotRequest struct {
	Config   config.Config
	Resolved report.Resolved
	Identity briefing.PreparedIdentity
}

type ReportFacts struct {
	Collected facts.CollectedFacts
	Derived   facts.DerivedFacts
}

type ReportResult struct {
	ReportID         report.ID
	ReportName       string
	PromptID         string
	PromptVersion    string
	RunID            string
	GeneratedAt      time.Time
	Timezone         string
	ValidPeriod      timeutil.Period
	ProfileID        string
	BackendID        string
	ModelName        string
	SourceWarnings   []weatherdata.SourceWarning
	ValidationStatus promptexec.ValidationStatus
	LLMDebugPath     string
	OutputPath       string
	Notification     *NotificationResult
}

type BatchResult struct {
	Batch        BatchKind                `json:"batch"`
	StartedAt    time.Time                `json:"startedAt"`
	FinishedAt   time.Time                `json:"finishedAt"`
	Total        int                      `json:"total"`
	Succeeded    int                      `json:"succeeded"`
	Failed       int                      `json:"failed"`
	Canceled     int                      `json:"canceled,omitempty"`
	Notification *BatchNotificationResult `json:"notification,omitempty"`
	Reports      []BatchReportResult      `json:"reports"`
}

type BatchNotificationResult struct {
	Status          string                    `json:"status"`
	Reason          string                    `json:"reason,omitempty"`
	RunID           string                    `json:"runId,omitempty"`
	PipelineID      string                    `json:"pipelineId,omitempty"`
	BundleID        string                    `json:"bundleId,omitempty"`
	IdempotencyKey  string                    `json:"idempotencyKey,omitempty"`
	IncludedReports []BatchNotificationReport `json:"includedReports,omitempty"`
	Error           string                    `json:"error,omitempty"`
}

type BatchNotificationReport struct {
	ReportID    report.ID `json:"reportId"`
	RunID       string    `json:"runId"`
	SourcePath  string    `json:"sourcePath"`
	BundlePaths []string  `json:"bundlePaths"`
}

type BatchReportResult struct {
	ReportID         report.ID                   `json:"reportId"`
	ReportName       string                      `json:"reportName"`
	PromptID         string                      `json:"promptId"`
	RunID            string                      `json:"runId"`
	Status           string                      `json:"status"`
	Error            string                      `json:"error,omitempty"`
	GeneratedAt      time.Time                   `json:"generatedAt"`
	ValidPeriod      timeutil.Period             `json:"validPeriod"`
	Timezone         string                      `json:"timezone"`
	ProfileID        string                      `json:"profileId,omitempty"`
	BackendID        string                      `json:"backendId,omitempty"`
	ModelName        string                      `json:"modelName,omitempty"`
	SourceWarnings   []weatherdata.SourceWarning `json:"sourceWarnings,omitempty"`
	ValidationStatus promptexec.ValidationStatus `json:"validationStatus,omitempty"`
	LLMDebugPath     string                      `json:"llmDebugPath,omitempty"`
	OutputPath       string                      `json:"outputPath,omitempty"`
}

type BatchError struct {
	Result *BatchResult
	Cause  error
}

func (e BatchError) Error() string {
	if e.Result == nil {
		return "batch failed"
	}
	if errors.Is(e.Cause, context.DeadlineExceeded) {
		return fmt.Sprintf("batch %s deadline exceeded", e.Result.Batch)
	}
	if errors.Is(e.Cause, context.Canceled) || e.Result.Canceled > 0 {
		return fmt.Sprintf("batch %s canceled", e.Result.Batch)
	}
	failedReports := batchReportFailures(e.Result)
	if batchNotificationFailed(e.Result) && failedReports == 0 {
		if e.Result.Notification.Error != "" {
			return fmt.Sprintf("batch %s notification failed: %s", e.Result.Batch, e.Result.Notification.Error)
		}
		return fmt.Sprintf("batch %s notification failed", e.Result.Batch)
	}
	return fmt.Sprintf("batch %s failed: %d of %d reports failed", e.Result.Batch, failedReports, len(e.Result.Reports))
}

func (e BatchError) Unwrap() error {
	return e.Cause
}

func batchNotificationFailed(result *BatchResult) bool {
	return result != nil && result.Notification != nil && result.Notification.Status == "failed"
}

func batchReportFailures(result *BatchResult) int {
	if result == nil {
		return 0
	}
	failures := 0
	for _, item := range result.Reports {
		if item.Status == "failed" {
			failures++
		}
	}
	return failures
}

type Collector interface {
	Run(context.Context, collect.Request) (*collect.Result, error)
}

type defaultCollector struct{}

func (defaultCollector) Run(ctx context.Context, req collect.Request) (*collect.Result, error) {
	return collect.Run(ctx, req)
}

type Notifier interface {
	Notify(context.Context, NotificationRequest) (*NotificationResult, error)
}

type NotificationRequest struct {
	ReportID       report.ID
	RunID          string
	PipelineID     string
	BundleID       string
	IdempotencyKey string
	ReportPath     string
	BundlePaths    []string
	CreatedAt      time.Time
}

type NotificationResult struct {
	BundleID       string
	IdempotencyKey string
	RunID          string
	Status         string
	UploadStatus   string
	StatusError    string
	PipelineID     string
	AcceptedAt     time.Time
	StartedAt      *time.Time
	FinishedAt     *time.Time
	Report         []byte
	Error          string
}

type NotificationError struct {
	Request NotificationRequest
	Err     error
}

func (e *NotificationError) Error() string {
	if e == nil || e.Err == nil {
		return "notification failed"
	}
	return e.Err.Error()
}

func (e *NotificationError) Unwrap() error {
	if e == nil {
		return nil
	}
	return e.Err
}

func Generate(ctx context.Context, req GenerateRequest) error {
	_, err := GenerateDetailed(ctx, req)
	return err
}

func GenerateDetailed(ctx context.Context, req GenerateRequest) (*ReportResult, error) {
	now := req.Now
	if now.IsZero() {
		now = time.Now()
	}
	resolved, err := ResolveGenerate(req, now)
	if err != nil {
		return nil, err
	}
	result := initialReportResult(req, resolved, PromptInspectionResult{})
	if err := preflightDistributorNotification(req.Config); err != nil {
		return result, err
	}
	outputPath, err := resolveReportOutputPath(req.WorkingDir, req.OutputPath, req.Config.Output.Directory, resolved)
	if err != nil {
		return result, err
	}
	req.OutputPath = outputPath
	debugWriter, err := promptdebug.NewPromptDebugWriter(req.LLMDebugDir)
	if err != nil {
		return result, promptexec.NewError(promptexec.InvalidConfiguration, "initialize prompt debug", err)
	}
	defer func() { _ = debugWriter.Close() }()
	inspection, err := InspectPromptExecution(ctx, PromptInspectionRequest{
		Resolved:  resolved,
		Executor:  req.Executor,
		Promptkit: req.Config.Promptkit,
	})
	if err != nil {
		return result, err
	}
	result.ProfileID, result.BackendID, result.ModelName = inspection.ProfileID, inspection.BackendID, inspection.ModelName
	collection, err := collectWeather(ctx, req.Config, req.Collector)
	if err != nil {
		return result, err
	}
	return generatePromptReport(ctx, promptReportRequest{
		GenerateRequest: req,
		Resolved:        resolved,
		Collection:      *collection,
		Inspection:      inspection,
		DebugWriter:     debugWriter,
		Result:          result,
	})
}

func RunBatch(ctx context.Context, req BatchRequest) error {
	result, err := RunBatchDetailed(ctx, req)
	if err != nil {
		return err
	}
	if result.Failed > 0 || batchNotificationFailed(result) {
		return BatchError{Result: result}
	}
	return nil
}

func RunBatchDetailed(ctx context.Context, req BatchRequest) (*BatchResult, error) {
	now := req.Now
	if now.IsZero() {
		now = time.Now()
	}
	if _, err := report.BatchForCommandName(string(req.Batch)); err != nil {
		return nil, err
	}
	if err := preflightDistributorNotification(req.Config); err != nil {
		return nil, err
	}
	outputDir, err := resolveOutputDirWithConfigured(req.WorkingDir, req.OutputDir, req.Config.Output.Directory)
	if err != nil {
		return nil, err
	}
	req.OutputDir = outputDir
	debugWriter, err := promptdebug.NewPromptDebugWriter(req.LLMDebugDir)
	if err != nil {
		return nil, promptexec.NewError(promptexec.InvalidConfiguration, "initialize prompt debug", err)
	}
	defer func() { _ = debugWriter.Close() }()
	candidates, err := batchInspectionCandidates(req, now)
	if err != nil {
		return nil, err
	}
	inspections, err := InspectPromptExecutions(ctx, PromptExecutionsInspectionRequest{
		Resolved:  candidates,
		Executor:  req.Executor,
		Promptkit: req.Config.Promptkit,
	})
	if err != nil {
		return nil, err
	}
	collection, err := collectWeather(ctx, req.Config, req.Collector)
	if err != nil {
		return nil, err
	}
	plannedReports, err := planBatchRun(req, now, *collection)
	if err != nil {
		return nil, err
	}
	if err := prepareBatchOutputs(req.OutputDir, plannedReports); err != nil {
		return nil, err
	}
	if req.Batch == BatchEvening || req.Batch == BatchMorning {
		startedAt := now
		result := &BatchResult{Batch: req.Batch, StartedAt: startedAt}
		var cancellation error
		for index, planned := range plannedReports {
			if cancellation = batchContextCancellationCause(ctx); cancellation != nil {
				appendCanceledBatchReports(result, plannedReports[index:])
				break
			}
			resolved := planned.Resolved
			item := batchReportResult(planned)
			reportResult, err := generatePromptReport(ctx, promptReportRequest{
				GenerateRequest: GenerateRequest{
					Config:     req.Config,
					OutputPath: planned.OutputPath,
					Notifier:   req.Notifier,
					Executor:   req.Executor,
				},
				Resolved:    resolved,
				Collection:  *collection,
				Inspection:  inspections[resolved.Definition.ID],
				DebugWriter: debugWriter,
				noNotify:    true,
			})
			if reportResult != nil {
				copyBatchReportDetails(&item, reportResult)
			}
			if err != nil {
				if reportCancellation := batchReportCancellationCause(err); reportCancellation != nil {
					cancellation = reportCancellation
					item.Status = "canceled"
					result.Canceled++
				} else {
					item.Status = "failed"
					item.Error = err.Error()
					result.Failed++
				}
			} else {
				item.Status = "succeeded"
				result.Succeeded++
			}
			result.Reports = append(result.Reports, item)
			if cancellation == nil {
				cancellation = batchContextCancellationCause(ctx)
			}
			if cancellation != nil {
				appendCanceledBatchReports(result, plannedReports[index+1:])
				break
			}
		}
		result.Total = len(result.Reports)
		batchNotification := notifyBatch(batchNotificationInput{
			ctx: ctx, cancellation: cancellation, cfg: req.Config, batch: req.Batch,
			runID: batchRunID(startedAt, req.Batch), startedAt: startedAt,
			result: result, planned: plannedReports, notifier: req.Notifier,
		})
		if batchNotification != nil {
			result.Notification = batchNotification
		}
		result.FinishedAt = time.Now()
		return result, cancellation
	}
	return nil, fmt.Errorf("run is not implemented")
}

func batchReportCancellationCause(err error) error {
	if errors.Is(err, context.Canceled) {
		return context.Canceled
	}
	if errors.Is(err, context.DeadlineExceeded) {
		return context.DeadlineExceeded
	}
	return nil
}

func batchContextCancellationCause(ctx context.Context) error {
	if ctx == nil {
		return nil
	}
	return ctx.Err()
}

func appendCanceledBatchReports(result *BatchResult, plannedReports []plannedBatchReport) {
	if result == nil {
		return
	}
	for _, planned := range plannedReports {
		item := batchReportResult(planned)
		item.Status = "canceled"
		result.Reports = append(result.Reports, item)
		result.Canceled++
	}
}

func copyBatchReportDetails(item *BatchReportResult, result *ReportResult) {
	item.LLMDebugPath = result.LLMDebugPath
	item.OutputPath = result.OutputPath
	item.ProfileID = result.ProfileID
	item.BackendID = result.BackendID
	item.ModelName = result.ModelName
	item.Timezone = result.Timezone
	item.SourceWarnings = append([]weatherdata.SourceWarning(nil), result.SourceWarnings...)
	item.ValidationStatus = result.ValidationStatus
}

func batchInspectionCandidates(req BatchRequest, now time.Time) ([]report.Resolved, error) {
	location, err := timeutil.LoadLocation(req.Config.WeatherAPI.Timezone)
	if err != nil {
		return nil, err
	}
	registry, err := reportRegistry(req.Config)
	if err != nil {
		return nil, err
	}
	ids := []report.ID{report.Tomorrow, report.Daily}
	if req.Batch == BatchMorning {
		ids = []report.ID{report.Today, report.Tomorrow, report.Daily}
	}
	date := timeutil.LocalDate(now, location).AddDate(0, 0, 2)
	candidates := make([]report.Resolved, 0, len(ids))
	for _, id := range ids {
		resolveReq := report.ResolveRequest{Now: now, Location: location}
		if id == report.Daily {
			resolveReq.Date = date
		}
		resolved, err := registry.Resolve(id, resolveReq)
		if err != nil {
			return nil, err
		}
		candidates = append(candidates, resolved)
	}
	return candidates, nil
}

func batchReportResult(planned plannedBatchReport) BatchReportResult {
	resolved := planned.Resolved
	metadata := resolved.Metadata()
	return BatchReportResult{
		ReportID:    resolved.Definition.ID,
		ReportName:  resolved.Definition.Name,
		PromptID:    resolved.Definition.PromptID,
		RunID:       metadata.RunID,
		GeneratedAt: metadata.GeneratedAt,
		ValidPeriod: metadata.ValidPeriod,
		Timezone:    "",
	}
}

func ResolveGenerate(req GenerateRequest, now time.Time) (report.Resolved, error) {
	location, err := timeutil.LoadLocation(req.Config.WeatherAPI.Timezone)
	if err != nil {
		return report.Resolved{}, err
	}
	id, err := report.IDForCommandName(string(req.Report))
	if err != nil {
		return report.Resolved{}, err
	}
	registry, err := reportRegistry(req.Config)
	if err != nil {
		return report.Resolved{}, err
	}
	return registry.Resolve(id, report.ResolveRequest{
		Now:      now,
		Location: location,
		Date:     req.Date,
	})
}

func reportRegistry(cfg config.Config) (report.Registry, error) {
	overrides, err := cfg.ReportModuleOverrides()
	if err != nil {
		return report.Registry{}, err
	}
	registry, err := report.DefaultRegistry().WithModuleOverrides(overrides)
	if err != nil {
		return report.Registry{}, err
	}
	return registry, nil
}

func collectWeather(ctx context.Context, cfg config.Config, collector Collector) (*collect.Result, error) {
	if collector == nil {
		collector = defaultCollector{}
	}
	result, err := collector.Run(ctx, collect.Request{Config: cfg})
	if err != nil {
		return nil, err
	}
	if result == nil {
		return nil, fmt.Errorf("collect weather bundle: collector returned nil result")
	}
	if result.Bundle == nil {
		return nil, fmt.Errorf("collect weather bundle: collector returned nil bundle")
	}
	return result, nil
}

func notifyReport(ctx context.Context, cfg config.Config, resolved report.Resolved, outputPath, runID string, generatedAt time.Time, notifier Notifier) (*NotificationResult, error) {
	notifier, enabled := reportNotifier(cfg, notifier)
	if !enabled {
		return nil, nil
	}
	notificationRequest, err := buildNotificationRequest(cfg, resolved, outputPath, runID, generatedAt)
	if err != nil {
		return nil, err
	}
	result, err := notifier.Notify(ctx, notificationRequest)
	if err != nil {
		return result, &NotificationError{
			Request: notificationRequest,
			Err:     fmt.Errorf("notify report %q run %q from output %q: %w", resolved.Definition.ID, runID, outputPath, err),
		}
	}
	return result, nil
}

func reportNotifier(cfg config.Config, notifier Notifier) (Notifier, bool) {
	if !cfg.Notify.Distributor.Enabled {
		return noopNotifier{}, false
	}
	if notifier != nil {
		return notifier, true
	}
	return distributorNotifier{
		client: distributoradapter.New(cfg.Notify.Distributor),
	}, true
}

func preflightDistributorNotification(cfg config.Config) error {
	if !cfg.Notify.Distributor.Enabled {
		return nil
	}
	if err := config.ValidateDistributorEndpoint(cfg.Notify.Distributor.Endpoint); err != nil {
		return fmt.Errorf("validate notify.distributor.endpoint: %w", err)
	}
	return nil
}

func buildNotificationRequest(cfg config.Config, resolved report.Resolved, outputPath, runID string, generatedAt time.Time) (NotificationRequest, error) {
	values, err := distributorTemplateValuesForReport(cfg, resolved, runID, filepath.Base(outputPath))
	if err != nil {
		return NotificationRequest{}, err
	}
	bundleID, err := config.RenderDistributorBundleID(cfg.Notify.Distributor.BundleIDTemplate, values)
	if err != nil {
		return NotificationRequest{}, err
	}
	values.BundleID = bundleID
	pipelineID, err := config.RenderDistributorPipelineID(cfg.Notify.Distributor.PipelineIDTemplate, values)
	if err != nil {
		return NotificationRequest{}, err
	}
	idempotencyKey, err := config.RenderDistributorIdempotencyKey(cfg.Notify.Distributor.IdempotencyKeyTemplate, values)
	if err != nil {
		return NotificationRequest{}, err
	}
	bundlePaths, err := renderDistributorReportBundlePaths(cfg, resolved, runID, outputPath, values)
	if err != nil {
		return NotificationRequest{}, err
	}
	return NotificationRequest{
		ReportID:       resolved.Definition.ID,
		RunID:          runID,
		PipelineID:     pipelineID,
		BundleID:       bundleID,
		IdempotencyKey: idempotencyKey,
		ReportPath:     outputPath,
		BundlePaths:    bundlePaths,
		CreatedAt:      generatedAt,
	}, nil
}

func distributorTemplateValuesForReport(cfg config.Config, resolved report.Resolved, runID string, outputName string) (config.DistributorTemplateValues, error) {
	values := config.DistributorTemplateValues{
		LocationID:      cfg.Location.ID,
		ReportID:        string(resolved.Definition.ID),
		RunID:           runID,
		ArtifactGroup:   resolved.Definition.ArtifactGroup,
		BatchOutputName: outputName,
	}
	if values.BatchOutputName == "" {
		var err error
		values.BatchOutputName, err = resolved.OutputName()
		if err != nil {
			return config.DistributorTemplateValues{}, err
		}
	}
	if err := addDistributorValidPeriodValues(&values, resolved.ValidPeriod, cfg.WeatherAPI.Timezone); err != nil {
		return config.DistributorTemplateValues{}, err
	}
	return values, nil
}

func renderDistributorReportBundlePaths(cfg config.Config, resolved report.Resolved, runID string, sourcePath string, values config.DistributorTemplateValues) ([]string, error) {
	templates, name, err := distributorPathTemplatesForReport(cfg, resolved.Definition)
	if err != nil {
		return nil, distributorReportPathError(resolved.Definition.ID, runID, sourcePath, err)
	}
	paths, err := config.RenderDistributorReportPaths(name, templates, values)
	if err != nil {
		return nil, distributorReportPathError(resolved.Definition.ID, runID, sourcePath, err)
	}
	return paths, nil
}

func distributorPathTemplatesForReport(cfg config.Config, definition report.Definition) ([]string, string, error) {
	overrides, err := cfg.ReportDistributorPathOverrides()
	if err != nil {
		return nil, "", err
	}
	if templates, ok := overrides[definition.ID]; ok {
		return append([]string(nil), templates...), fmt.Sprintf("reports.%s.distributor.path_templates", definition.ID), nil
	}
	if len(definition.DistributorPathTemplates) > 0 {
		return append([]string(nil), definition.DistributorPathTemplates...), fmt.Sprintf("report.%s.distributor_path_templates", definition.ID), nil
	}
	return nil, "", fmt.Errorf("no distributor path templates configured")
}

func distributorReportPathError(id report.ID, runID string, sourcePath string, err error) error {
	if sourcePath != "" {
		return fmt.Errorf("report %q run %q source path %q: %w", id, runID, sourcePath, err)
	}
	return fmt.Errorf("report %q run %q: %w", id, runID, err)
}

func addDistributorValidPeriodValues(values *config.DistributorTemplateValues, period timeutil.Period, timezone string) error {
	location, err := timeutil.LoadLocation(timezone)
	if err != nil {
		return err
	}
	start := period.Start.In(location)
	end := period.End.In(location)
	values.ValidStartDate = start.Format(timeutil.DateLayout)
	values.ValidEndDate = end.Format(timeutil.DateLayout)
	values.ValidStartTime = start.Format("1504")
	values.ValidEndTime = end.Format("1504")
	values.ValidStartStamp = start.Format("2006-01-02T1504")
	values.ValidEndStamp = end.Format("2006-01-02T1504")
	return nil
}

type noopNotifier struct{}

func (noopNotifier) Notify(context.Context, NotificationRequest) (*NotificationResult, error) {
	return nil, nil
}

type distributorNotifier struct {
	client *distributoradapter.Client
}

func (n distributorNotifier) Notify(ctx context.Context, req NotificationRequest) (*NotificationResult, error) {
	result, err := n.client.Upload(ctx, distributoradapter.UploadRequest{
		PipelineID:     req.PipelineID,
		BundleID:       req.BundleID,
		IdempotencyKey: req.IdempotencyKey,
		Files:          distributorUploadFiles(req.ReportPath, req.BundlePaths),
		CreatedAt:      req.CreatedAt,
	})
	notification := notificationResultFromUpload(req.PipelineID, req.BundleID, req.IdempotencyKey, result)
	if err != nil {
		return notification, err
	}
	return notification, nil
}

func (n distributorNotifier) NotifyBatch(ctx context.Context, req batchNotificationRequest) (*NotificationResult, error) {
	result, err := n.client.Upload(ctx, batchDistributorUploadRequest(req))
	notification := notificationResultFromUpload(req.PipelineID, req.BundleID, req.IdempotencyKey, result)
	if err != nil {
		return notification, err
	}
	return notification, nil
}

func notificationResultFromUpload(pipelineID string, bundleID string, idempotencyKey string, result distributoradapter.UploadResult) *NotificationResult {
	notification := &NotificationResult{
		PipelineID:     pipelineID,
		BundleID:       bundleID,
		IdempotencyKey: idempotencyKey,
		RunID:          result.RunID,
		Status:         result.Status,
		UploadStatus:   result.UploadStatus,
		StatusError:    safeDistributorStatusError(result.StatusError),
	}
	if result.RunStatus != nil {
		if result.RunStatus.PipelineID != "" {
			notification.PipelineID = result.RunStatus.PipelineID
		}
		notification.AcceptedAt = result.RunStatus.AcceptedAt
		notification.StartedAt = result.RunStatus.StartedAt
		notification.FinishedAt = result.RunStatus.FinishedAt
		notification.Error = safeDistributorRunError(result.RunStatus.Error)
	}
	return notification
}

func safeDistributorStatusError(value string) string {
	if value == "" {
		return ""
	}
	return "distributor status could not be confirmed"
}

func safeDistributorRunError(value string) string {
	if value == "" {
		return ""
	}
	return "distributor reported a failed run"
}

func distributorUploadFiles(sourcePath string, bundlePaths []string) []distributoradapter.UploadFile {
	files := make([]distributoradapter.UploadFile, 0, len(bundlePaths))
	for _, bundlePath := range bundlePaths {
		files = append(files, distributoradapter.UploadFile{
			SourcePath: sourcePath,
			BundlePath: bundlePath,
		})
	}
	return files
}

func BuildModuleSnapshot(req ModuleSnapshotRequest, bundle *weatherdata.Bundle) (module.Snapshot, error) {
	reportFacts, err := BuildReportFacts(req, bundle)
	if err != nil {
		return module.Snapshot{}, err
	}
	return BuildModuleSnapshotFromFacts(req, reportFacts)
}

func BuildReportFacts(req ModuleSnapshotRequest, bundle *weatherdata.Bundle) (ReportFacts, error) {
	collected := facts.BuildCollected(bundle)
	derived, err := buildDerivedFacts(req.Config, req.Resolved, collected)
	if err != nil {
		return ReportFacts{}, err
	}
	return ReportFacts{
		Collected: collected,
		Derived:   derived,
	}, nil
}

func BuildModuleSnapshotFromFacts(req ModuleSnapshotRequest, reportFacts ReportFacts) (module.Snapshot, error) {
	if !req.Resolved.ValidPeriod.IsValid() {
		return module.Snapshot{}, fmt.Errorf("resolved valid period is required")
	}
	registry, err := briefing.DefaultModuleRegistry()
	if err != nil {
		return module.Snapshot{}, err
	}
	identity := req.Identity
	if identity.ReportID == "" {
		identity = briefing.BuildPreparedIdentity(briefingBuildContext(req.Config, req.Resolved, reportFacts.Collected))
	}
	moduleContext := briefing.ModuleContext{
		Identity:  identity,
		Resolved:  req.Resolved,
		Collected: reportFacts.Collected,
		Derived:   reportFacts.Derived,
		Units:     req.Config.WeatherAPI.Units,
		Timezone:  req.Config.WeatherAPI.Timezone,
		Location:  briefingLocation(req.Config),
	}
	var outputs []module.Output
	for _, item := range req.Resolved.Definition.Modules {
		output, err := registry.BuildModule(moduleContext, item)
		if err != nil {
			return module.Snapshot{}, err
		}
		if output == nil {
			continue
		}
		outputs = append(outputs, *output)
	}
	return module.NewSnapshot(outputs)
}

func briefingBuildContext(cfg config.Config, resolved report.Resolved, collected facts.CollectedFacts) briefing.BuildContext {
	return briefing.BuildContext{
		Resolved: resolved,
		Bundle:   collected.Bundle(),
		Units:    cfg.WeatherAPI.Units,
		Timezone: cfg.WeatherAPI.Timezone,
		Location: briefingLocation(cfg),
	}
}

func promptMetadata(identity briefing.PreparedIdentity) promptinput.Metadata {
	return promptinput.Metadata{
		RunID:          identity.RunID,
		ReportID:       identity.ReportID,
		Variant:        identity.Variant,
		PromptID:       identity.PromptID,
		GeneratedAt:    identity.GeneratedAt,
		Timezone:       identity.Timezone,
		ValidPeriod:    identity.ValidPeriod,
		SourceWarnings: identity.SourceWarnings,
	}
}

func buildDerivedFacts(cfg config.Config, resolved report.Resolved, collected facts.CollectedFacts) (facts.DerivedFacts, error) {
	dayparts := make([]forecast.DaypartDefinition, 0, len(cfg.Dayparts))
	for _, daypart := range cfg.Dayparts {
		dayparts = append(dayparts, forecast.DaypartDefinition{
			Name:  daypart.Name,
			Start: daypart.Start,
			End:   daypart.End,
		})
	}
	return facts.BuildDerived(facts.BuildDerivedRequest{
		Resolved:  resolved,
		Timezone:  cfg.WeatherAPI.Timezone,
		Dayparts:  dayparts,
		Collected: collected,
	})
}

func briefingLocation(cfg config.Config) *briefing.LocationContext {
	location := briefing.LocationContext{
		ID:       cfg.Location.ID,
		Name:     cfg.Location.Name,
		Region:   cfg.Location.Region,
		Timezone: cfg.WeatherAPI.Timezone,
	}
	if location.ID == "" && location.Name == "" && location.Region == "" && location.Timezone == "" {
		return nil
	}
	return &location
}

func generatedReportError(resolved report.Resolved, runID string, operation string, err error) error {
	if err == nil {
		return nil
	}
	return fmt.Errorf("generate report %q run %q: %s: %w", resolved.Definition.ID, runID, operation, err)
}