package app

import (
	"context"

	"gitea.maximumdirect.net/eric/distributor/internal/bundle"
	"gitea.maximumdirect.net/eric/distributor/internal/config"
	"gitea.maximumdirect.net/eric/distributor/internal/notify"
	"gitea.maximumdirect.net/eric/distributor/internal/publish"
	"gitea.maximumdirect.net/eric/distributor/internal/storage"
)

type runDestinationRequest struct {
	options       RunOptions
	notifier      notify.Notifier
	backends      *backendFactory
	transforms    publish.TransformerResolver
	pipeline      config.Pipeline
	pipelineIndex int
	sourceBackend storage.Backend
	bundles       []bundle.Bundle
	destination   config.Destination
	recorder      *runReportRecorder
}

func processDestination(ctx context.Context, request runDestinationRequest) {
	selections := selectDestinationBundles(request.destination, request.bundles)
	if isFixedPathDestination(request.destination) {
		request.recorder.summary.recordFixedPath()
		if request.options.DryRun {
			warning := fixedPathSelectionWarning(request.pipeline.ID, request.destination.ID, selections, len(request.bundles))
			request.recorder.addPipelineWarning(request.pipelineIndex, warning)
		}
	}
	if len(selections) == 0 {
		return
	}
	destinationBackend, err := request.backends.openDestination(ctx, request.destination)
	if err != nil {
		for _, selection := range selections {
			sourceBundle := selection.SourceBundle
			request.recorder.recordDestinationFailure(request.pipelineIndex, runFailure{
				pipelineID:    request.pipeline.ID,
				destinationID: request.destination.ID,
				backend:       request.destination.Backend,
				bundlePath:    sourceBundle.RootRelativePath,
				err:           err,
			}, errorAction(request.pipeline.ID, request.destination.ID, request.destination.Backend, sourceBundle.RootRelativePath, err), true)
		}
		return
	}
	defer closeBackend(destinationBackend)

	for _, selection := range selections {
		processDestinationSelection(ctx, request, destinationBackend, selection)
	}
}

func processDestinationSelection(ctx context.Context, request runDestinationRequest, destinationBackend storage.Backend, selection destinationBundleSelection) {
	sourceBundle := selection.SourceBundle
	publishRequest := publish.Request{
		PipelineID:            request.pipeline.ID,
		DestinationID:         request.destination.ID,
		SourceBundle:          sourceBundle,
		SourceBackend:         request.sourceBackend,
		DestinationBackend:    destinationBackend,
		DestinationBundlePath: selection.DestinationBundlePath,
		PathMapping:           request.destination.PathMap.Mode,
		Publish:               *request.destination.Publish,
		Transform:             request.destination.Transform,
		Links:                 request.destination.Links,
		Transformers:          request.transforms,
		Transfer:              request.destination.Transfer,
		DistributorVersion:    Version,
		Force:                 request.options.Force,
	}
	plan, err := publish.Build(ctx, publishRequest)
	if err != nil {
		plan = completePlanIdentity(plan, request.pipeline, request.destination, selection)
	}
	if isFixedPathDestination(request.destination) {
		plan.PathMapping = config.PathMappingFixed
		if request.options.DryRun && isDestructiveFixedPathAction(plan.Action) {
			warning := fixedPathReplacementWarning(plan)
			request.recorder.addPipelineWarning(request.pipelineIndex, warning)
		}
	}
	action := runActionFromPlan(request.destination.Backend, plan, err)
	if err != nil {
		request.recorder.recordDestinationFailure(request.pipelineIndex, runFailure{
			pipelineID:    request.pipeline.ID,
			destinationID: request.destination.ID,
			backend:       request.destination.Backend,
			bundlePath:    sourceBundle.RootRelativePath,
			err:           err,
		}, action, true)
		return
	}
	request.recorder.addPipelineAction(request.pipelineIndex, action)
	request.recorder.summary.recordPlan(plan.Action)
	if request.options.DryRun {
		return
	}
	if err := publish.Execute(ctx, publishRequest, plan); err != nil {
		request.recorder.recordDestinationFailure(request.pipelineIndex, runFailure{
			pipelineID:    request.pipeline.ID,
			destinationID: request.destination.ID,
			backend:       request.destination.Backend,
			bundlePath:    sourceBundle.RootRelativePath,
			err:           err,
		}, RunActionRecord{}, false)
		return
	}
	if shouldNotify(plan.Action) {
		if err := request.notifier.Notify(ctx, notifyEvent(plan)); err != nil {
			request.recorder.recordDestinationFailure(request.pipelineIndex, runFailure{
				pipelineID:    request.pipeline.ID,
				destinationID: request.destination.ID,
				backend:       request.destination.Backend,
				bundlePath:    sourceBundle.RootRelativePath,
				err:           err,
			}, RunActionRecord{}, false)
			return
		}
	}
}

func (recorder *runReportRecorder) addPipelineWarning(pipelineIndex int, warning OutputWarning) {
	recorder.report.addWarning(warning)
	recorder.report.Pipelines[pipelineIndex].events = append(recorder.report.Pipelines[pipelineIndex].events, warningEvent(warning))
}

func (recorder *runReportRecorder) addPipelineAction(pipelineIndex int, action RunActionRecord) {
	recorder.report.Actions = append(recorder.report.Actions, action)
	recorder.report.Pipelines[pipelineIndex].events = append(recorder.report.Pipelines[pipelineIndex].events, actionEvent(len(recorder.report.Actions)-1))
}

func (recorder *runReportRecorder) recordDestinationFailure(pipelineIndex int, failure runFailure, action RunActionRecord, includeAction bool) {
	recorder.failures.add(failure.pipelineID, failure.destinationID, failure.backend, storage.DisplayPath(failure.bundlePath), failure.err)
	recorder.summary.recordFailure()
	if includeAction {
		recorder.addPipelineAction(pipelineIndex, action)
	}
}

func completePlanIdentity(plan publish.Plan, pipeline config.Pipeline, destination config.Destination, selection destinationBundleSelection) publish.Plan {
	if plan.PipelineID == "" {
		plan.PipelineID = pipeline.ID
	}
	if plan.DestinationID == "" {
		plan.DestinationID = destination.ID
	}
	if plan.BundleID == "" {
		plan.BundleID = selection.SourceBundle.Manifest.ID
	}
	if plan.BundlePath == "" {
		plan.BundlePath = selection.SourceBundle.RootRelativePath
	}
	if plan.DestinationBundlePath == "" {
		plan.DestinationBundlePath = selection.DestinationBundlePath
	}
	return plan
}