package service

import (
	"encoding/json"
	"errors"
	"net/url"
	"sort"
	"strings"
	"time"

	"browser.local/platform/domain"
	"browser.local/platform/repo"
	"browser.local/platform/validator"
)

const runUpdateChunkSize = 1024 * 1024

type dependencyResolution struct {
	instance domain.ServerInstance
	plugin   domain.GamePlugin
	binding  domain.RuntimeBinding
	endpoint domain.RunEndpoint
}

func (svc *CoreService) GetDependencyCatalogForSession(sessionID, serverInstanceID string) (domain.DependencyCatalog, error) {
	instance, err := svc.GetServerInstanceForSession(sessionID, serverInstanceID)
	if err != nil {
		return domain.DependencyCatalog{}, err
	}
	plugin, err := svc.store.GamePlugins().Get(instance.PluginID)
	if err != nil {
		return domain.DependencyCatalog{}, err
	}
	if !pluginDeclares(plugin, "server.dependencies.manage") {
		return domain.DependencyCatalog{}, forbiddenError("plugin does not declare required permission: server.dependencies.manage")
	}
	resolution, err := svc.resolveDependencyContext(serverInstanceID)
	if err != nil {
		return domain.DependencyCatalog{}, err
	}
	statuses, err := svc.store.DependencyStatuses().List(domain.DependencyStatusFilter{ServerInstanceID: serverInstanceID})
	if err != nil {
		return domain.DependencyCatalog{}, err
	}
	statusByProbe := map[string]domain.DependencyStatus{}
	for _, status := range statuses {
		statusByProbe[status.ProbeKey] = status
	}

	plans := make([]domain.DependencyPlanView, 0, len(resolution.plugin.RuntimeProfiles.InstallPlans))
	for _, plan := range resolution.plugin.RuntimeProfiles.InstallPlans {
		if !runtimePlatformsContain(plan.Platforms, resolution.endpoint.Platform) {
			continue
		}
		steps := make([]domain.DependencyPlanStepView, len(plan.Steps))
		for i, step := range plan.Steps {
			host := ""
			if parsed, parseErr := url.Parse(step.DownloadRef); parseErr == nil {
				host = parsed.Hostname()
			}
			steps[i] = domain.DependencyPlanStepView{Type: step.Type, TargetKey: step.TargetKey, PackageManager: step.PackageManager, PackageName: step.PackageName, Version: step.Version, DownloadHost: host}
		}
		var planProbe domain.RuntimeDependencyProbe
		for _, candidate := range resolution.plugin.RuntimeProfiles.DependencyProbes {
			if runtimePlatformsContain(candidate.Platforms, resolution.endpoint.Platform) && planTargetsProbe(plan, candidate) {
				planProbe = candidate
				break
			}
		}
		plans = append(plans, domain.DependencyPlanView{Key: plan.Key, Title: plan.Title, TargetOS: resolution.endpoint.Platform, TargetArch: resolution.endpoint.Architecture, Digest: dependencyPlanDigest(resolution, planProbe, plan), Steps: steps})
	}
	sort.Slice(plans, func(i, j int) bool { return plans[i].Key < plans[j].Key })

	probes := make([]domain.DependencyProbeView, 0, len(resolution.plugin.RuntimeProfiles.DependencyProbes))
	for _, probe := range resolution.plugin.RuntimeProfiles.DependencyProbes {
		if !runtimePlatformsContain(probe.Platforms, resolution.endpoint.Platform) {
			continue
		}
		status := statusByProbe[probe.Key]
		planKey := ""
		for _, plan := range resolution.plugin.RuntimeProfiles.InstallPlans {
			if runtimePlatformsContain(plan.Platforms, resolution.endpoint.Platform) && planTargetsProbe(plan, probe) {
				planKey = plan.Key
				break
			}
		}
		state := status.State
		if state == "" {
			state = domain.DependencyStateUnknown
		}
		probes = append(probes, domain.DependencyProbeView{Key: probe.Key, Kind: probe.Kind, Required: probe.Required, MinimumVersion: probe.MinimumVersion, State: state, Evidence: status.Evidence, InstallPlanKey: planKey})
	}
	sort.Slice(probes, func(i, j int) bool { return probes[i].Key < probes[j].Key })

	return domain.CopyDependencyCatalog(domain.DependencyCatalog{ServerInstanceID: resolution.instance.ID, PluginID: resolution.plugin.ID, PluginVersion: resolution.plugin.Version, ProfileKey: resolution.binding.ProfileKey, TargetOS: resolution.endpoint.Platform, TargetArch: resolution.endpoint.Architecture, Probes: probes, Plans: plans, UpdatedAt: svc.now()}), nil
}

func (svc *CoreService) ListRunUpdateJobsForSession(sessionID, serverInstanceID string) ([]domain.RunUpdateJob, error) {
	if _, err := svc.GetServerInstanceForSession(sessionID, serverInstanceID); err != nil {
		return nil, err
	}
	items, err := svc.store.RunUpdateJobs().List(domain.RunUpdateJobFilter{ServerInstanceID: serverInstanceID})
	if err != nil {
		return nil, err
	}
	sort.Slice(items, func(i, j int) bool { return items[i].UpdatedAt.After(items[j].UpdatedAt) })
	for i := range items {
		items[i] = domain.CopyRunUpdateJob(items[i])
	}
	return items, nil
}

func (svc *CoreService) GetDependencyExecutionInput(request domain.DependencyExecutionInputRequest) (domain.DependencyExecutionInput, error) {
	if err := validator.ValidateDependencyExecutionInputRequest(request); err != nil {
		return domain.DependencyExecutionInput{}, err
	}
	job, err := svc.activeFencedInputJob(request.RunEndpointID, request.SessionToken, request.JobID, request.LeaseToken, request.Attempt)
	if err != nil {
		return domain.DependencyExecutionInput{}, err
	}
	if job.Capability != domain.JobCapabilityDependenciesCheck && job.Capability != domain.JobCapabilityDependenciesInstall {
		return domain.DependencyExecutionInput{}, validationError("job is not a dependency operation")
	}
	resolution, err := svc.resolveDependencyContext(job.ServerInstanceID)
	if err != nil {
		return domain.DependencyExecutionInput{}, err
	}
	if resolution.endpoint.ID != job.RunEndpointID {
		return domain.DependencyExecutionInput{}, validationError("dependency endpoint no longer matches")
	}
	probeKey := strings.TrimPrefix(job.TargetKey, "dependencies/")
	if job.Capability == domain.JobCapabilityDependenciesInstall {
		probeKey = ""
	}
	var probe domain.RuntimeDependencyProbe
	if probeKey != "" {
		probe, err = declaredDependencyProbe(resolution.plugin, probeKey, resolution.endpoint.Platform)
		if err != nil {
			return domain.DependencyExecutionInput{}, err
		}
	}
	var plan domain.RuntimeInstallPlan
	if job.Capability == domain.JobCapabilityDependenciesInstall {
		planKey := strings.TrimPrefix(job.TargetKey, "dependencies/install/")
		plan, err = declaredInstallPlan(resolution.plugin, planKey, resolution.endpoint.Platform)
		if err != nil {
			return domain.DependencyExecutionInput{}, err
		}
		statuses, listErr := svc.store.DependencyStatuses().List(domain.DependencyStatusFilter{ServerInstanceID: job.ServerInstanceID})
		if listErr != nil {
			return domain.DependencyExecutionInput{}, listErr
		}
		for _, status := range statuses {
			if status.JobID == job.ID {
				probe, err = declaredDependencyProbe(resolution.plugin, status.ProbeKey, resolution.endpoint.Platform)
				if err != nil {
					return domain.DependencyExecutionInput{}, err
				}
				break
			}
		}
	}
	digest := dependencyPlanDigest(resolution, probe, plan)
	status, err := svc.dependencyStatusForJob(job.ID, job.ServerInstanceID)
	if err != nil {
		return domain.DependencyExecutionInput{}, err
	}
	if status.PlanDigest != digest {
		return domain.DependencyExecutionInput{}, validationError("dependency declaration changed after dispatch")
	}
	bindings, err := dependencyBindings(resolution.binding, probe, plan)
	if err != nil {
		return domain.DependencyExecutionInput{}, err
	}
	return domain.CopyDependencyExecutionInput(domain.DependencyExecutionInput{JobID: job.ID, ServerInstanceID: job.ServerInstanceID, RunEndpointID: job.RunEndpointID, PluginID: resolution.plugin.ID, PluginVersion: resolution.plugin.Version, ProfileKey: resolution.binding.ProfileKey, TargetOS: resolution.endpoint.Platform, TargetArch: resolution.endpoint.Architecture, PlanDigest: digest, Probe: probe, Plan: plan, Bindings: bindings}), nil
}

func (svc *CoreService) GetRunUpdateInput(request domain.RunUpdateInputRequest) (domain.RunUpdateInput, error) {
	if err := validator.ValidateRunUpdateInputRequest(request); err != nil {
		return domain.RunUpdateInput{}, err
	}
	job, err := svc.activeFencedInputJob(request.RunEndpointID, request.SessionToken, request.JobID, request.LeaseToken, request.Attempt)
	if err != nil {
		return domain.RunUpdateInput{}, err
	}
	if job.Capability != domain.JobCapabilityRunSelfUpdate {
		return domain.RunUpdateInput{}, validationError("job is not a Run self-update")
	}
	update, distribution, artifact, err := svc.resolveRunUpdate(job)
	if err != nil {
		return domain.RunUpdateInput{}, err
	}
	return domain.RunUpdateInput{JobID: job.ID, ServerInstanceID: job.ServerInstanceID, RunEndpointID: job.RunEndpointID, ArtifactID: artifact.ID, Checksum: artifact.Checksum, SizeBytes: artifact.SizeBytes, TargetOS: distribution.TargetOS, TargetArch: distribution.TargetArch, PackageFormat: distribution.PackageFormat, ExecutableName: executableFilename("run", distribution.TargetOS), TargetRelease: update.TargetRelease, ChunkSizeBytes: runUpdateChunkSize}, nil
}

func (svc *CoreService) ReadRunUpdateChunk(request domain.RunUpdateChunkRequest) (domain.RunUpdateChunk, error) {
	if err := validator.ValidateRunUpdateChunkRequest(request); err != nil {
		return domain.RunUpdateChunk{}, err
	}
	job, err := svc.activeFencedInputJob(request.RunEndpointID, request.SessionToken, request.JobID, request.LeaseToken, request.Attempt)
	if err != nil {
		return domain.RunUpdateChunk{}, err
	}
	if job.Capability != domain.JobCapabilityRunSelfUpdate {
		return domain.RunUpdateChunk{}, validationError("job is not a Run self-update")
	}
	_, _, artifact, err := svc.resolveRunUpdate(job)
	if err != nil {
		return domain.RunUpdateChunk{}, err
	}
	payload, err := svc.artifactPayload(artifact.ID)
	if err != nil {
		return domain.RunUpdateChunk{}, err
	}
	if int64(len(payload)) != artifact.SizeBytes || validator.BytesChecksum(payload) != artifact.Checksum {
		return domain.RunUpdateChunk{}, validationError("update artifact content does not match metadata")
	}
	if request.Offset >= artifact.SizeBytes {
		return domain.RunUpdateChunk{}, validationError("offset must be inside update artifact")
	}
	length := request.Length
	remaining := artifact.SizeBytes - request.Offset
	if int64(length) > remaining {
		length = int(remaining)
	}
	end := request.Offset + int64(length)
	return domain.CopyRunUpdateChunk(domain.RunUpdateChunk{JobID: job.ID, ArtifactID: artifact.ID, Offset: request.Offset, TotalBytes: artifact.SizeBytes, Checksum: artifact.Checksum, Payload: payload[int(request.Offset):int(end)], Complete: end == artifact.SizeBytes}), nil
}

func (svc *CoreService) activeFencedInputJob(endpointID, sessionToken, jobID, leaseToken string, attempt int) (domain.Job, error) {
	session, err := svc.validatedRunSession(endpointID, sessionToken)
	if err != nil {
		return domain.Job{}, err
	}
	svc.jobMu.Lock()
	defer svc.jobMu.Unlock()
	job, err := svc.fencedJob(session, jobID, leaseToken, attempt)
	if err != nil {
		return domain.Job{}, err
	}
	if job.State != domain.JobStateAccepted && job.State != domain.JobStateRunning {
		return domain.Job{}, validationError("job input is not active")
	}
	if !job.CancelRequestedAt.IsZero() {
		return domain.Job{}, validationError("job input is cancelled")
	}
	return job, nil
}

func (svc *CoreService) resolveDependencyContext(serverInstanceID string) (dependencyResolution, error) {
	instance, err := svc.store.ServerInstances().Get(serverInstanceID)
	if err != nil {
		return dependencyResolution{}, err
	}
	plugin, err := svc.store.GamePlugins().Get(instance.PluginID)
	if err != nil {
		return dependencyResolution{}, err
	}
	if plugin.Status != domain.GamePluginStatusInstalled || plugin.Version != instance.PluginVersion {
		return dependencyResolution{}, validationError("installed plugin version does not match server")
	}
	binding, err := svc.runtimeBindingForServer(instance.ID)
	if err != nil {
		return dependencyResolution{}, err
	}
	binding, err = normalizeRuntimeBinding(plugin, binding)
	if err != nil {
		return dependencyResolution{}, err
	}
	if binding.Status != domain.RuntimeBindingStatusComplete || binding.PluginVersion != plugin.Version {
		return dependencyResolution{}, validationError("runtime binding is incomplete or stale")
	}
	endpoint, err := svc.GetRunEndpoint(instance.RunEndpointID)
	if err != nil {
		return dependencyResolution{}, err
	}
	if endpoint.Platform == "" || endpoint.Architecture == "" {
		return dependencyResolution{}, validationError("Run endpoint target is not registered")
	}
	return dependencyResolution{instance: instance, plugin: plugin, binding: binding, endpoint: endpoint}, nil
}

func declaredDependencyProbe(plugin domain.GamePlugin, key, targetOS string) (domain.RuntimeDependencyProbe, error) {
	for _, probe := range plugin.RuntimeProfiles.DependencyProbes {
		if probe.Key == key && runtimePlatformsContain(probe.Platforms, targetOS) {
			return probe, nil
		}
	}
	return domain.RuntimeDependencyProbe{}, validationError("dependency probe is not declared for endpoint target")
}

func declaredInstallPlan(plugin domain.GamePlugin, key, targetOS string) (domain.RuntimeInstallPlan, error) {
	for _, plan := range plugin.RuntimeProfiles.InstallPlans {
		if plan.Key == key && runtimePlatformsContain(plan.Platforms, targetOS) {
			return plan, nil
		}
	}
	return domain.RuntimeInstallPlan{}, validationError("dependency install plan is not declared for endpoint target")
}

func runtimePlatformsContain(platforms []string, target string) bool {
	if len(platforms) == 0 {
		return true
	}
	for _, platform := range platforms {
		if platform == target {
			return true
		}
	}
	return false
}

func planTargetsProbe(plan domain.RuntimeInstallPlan, probe domain.RuntimeDependencyProbe) bool {
	for _, step := range plan.Steps {
		if step.TargetKey == probe.TargetKey {
			return true
		}
	}
	return false
}

func dependencyPlanDigest(resolution dependencyResolution, probe domain.RuntimeDependencyProbe, plan domain.RuntimeInstallPlan) string {
	keys := make([]string, 0, len(resolution.binding.Bindings))
	for key := range resolution.binding.Bindings {
		keys = append(keys, key)
	}
	sort.Strings(keys)
	bindingEvidence := make([]string, 0, len(keys))
	for _, key := range keys {
		bindingEvidence = append(bindingEvidence, key+"="+validator.BytesChecksum([]byte(resolution.binding.Bindings[key])))
	}
	payload := struct {
		PluginID      string                        `json:"pluginId"`
		PluginVersion string                        `json:"pluginVersion"`
		ProfileKey    string                        `json:"profileKey"`
		TargetOS      string                        `json:"targetOs"`
		TargetArch    string                        `json:"targetArch"`
		Binding       []string                      `json:"binding"`
		Probe         domain.RuntimeDependencyProbe `json:"probe"`
		Plan          domain.RuntimeInstallPlan     `json:"plan"`
	}{resolution.plugin.ID, resolution.plugin.Version, resolution.binding.ProfileKey, resolution.endpoint.Platform, resolution.endpoint.Architecture, bindingEvidence, probe, plan}
	body, _ := json.Marshal(payload)
	return validator.BytesChecksum(body)
}

func dependencyBindings(binding domain.RuntimeBinding, probe domain.RuntimeDependencyProbe, plan domain.RuntimeInstallPlan) (map[string]string, error) {
	keys := map[string]struct{}{}
	if probe.TargetKey != "" {
		keys[probe.TargetKey] = struct{}{}
	}
	for _, step := range plan.Steps {
		if step.TargetKey != "" {
			keys[step.TargetKey] = struct{}{}
		}
	}
	out := make(map[string]string, len(keys))
	for key := range keys {
		value := strings.TrimSpace(binding.Bindings[key])
		if value == "" {
			value = key
		}
		lower := strings.ToLower(value)
		if strings.HasPrefix(lower, "secret://") || strings.Contains(lower, "password=") || strings.Contains(lower, "token=") {
			return nil, validationError("dependency target binding cannot be a secret")
		}
		out[key] = value
	}
	return out, nil
}

func (svc *CoreService) dependencyStatusForJob(jobID, serverInstanceID string) (domain.DependencyStatus, error) {
	statuses, err := svc.store.DependencyStatuses().List(domain.DependencyStatusFilter{ServerInstanceID: serverInstanceID})
	if err != nil {
		return domain.DependencyStatus{}, err
	}
	for _, status := range statuses {
		if status.JobID == jobID {
			return status, nil
		}
	}
	return domain.DependencyStatus{}, repo.ErrNotFound
}

func (svc *CoreService) resolveRunUpdate(job domain.Job) (domain.RunUpdateJob, domain.RunDistribution, domain.Artifact, error) {
	updates, err := svc.store.RunUpdateJobs().List(domain.RunUpdateJobFilter{ServerInstanceID: job.ServerInstanceID})
	if err != nil {
		return domain.RunUpdateJob{}, domain.RunDistribution{}, domain.Artifact{}, err
	}
	var update domain.RunUpdateJob
	for _, candidate := range updates {
		if candidate.JobID == job.ID {
			update = candidate
			break
		}
	}
	if update.ID == "" || update.RunEndpointID != job.RunEndpointID {
		return domain.RunUpdateJob{}, domain.RunDistribution{}, domain.Artifact{}, validationError("Run update record does not match active job")
	}
	distributions, err := svc.store.RunDistributions().List(domain.RunDistributionFilter{ServerInstanceID: job.ServerInstanceID, Status: domain.DistributionStatusAvailable})
	if err != nil {
		return domain.RunUpdateJob{}, domain.RunDistribution{}, domain.Artifact{}, err
	}
	var distribution domain.RunDistribution
	for _, candidate := range distributions {
		if candidate.ArtifactID == update.ArtifactID {
			distribution = candidate
			break
		}
	}
	if distribution.ID == "" || distribution.RunEndpointID != job.RunEndpointID || distribution.TargetOS != update.TargetOS || distribution.TargetArch != update.TargetArch || distribution.Checksum != update.Checksum {
		return domain.RunUpdateJob{}, domain.RunDistribution{}, domain.Artifact{}, validationError("Run distribution no longer matches update")
	}
	endpoint, err := svc.GetRunEndpoint(job.RunEndpointID)
	if err != nil {
		return domain.RunUpdateJob{}, domain.RunDistribution{}, domain.Artifact{}, err
	}
	if endpoint.Platform != distribution.TargetOS || endpoint.Architecture != distribution.TargetArch {
		return domain.RunUpdateJob{}, domain.RunDistribution{}, domain.Artifact{}, validationError("Run update target no longer matches endpoint")
	}
	artifact, err := svc.store.Artifacts().Get(update.ArtifactID)
	if err != nil {
		return domain.RunUpdateJob{}, domain.RunDistribution{}, domain.Artifact{}, err
	}
	if artifact.State != domain.ArtifactStateAvailable || artifact.OwnerKind != domain.ArtifactOwnerKindJob || artifact.OwnerID != distribution.BuildJobID || artifact.Checksum != update.Checksum {
		return domain.RunUpdateJob{}, domain.RunDistribution{}, domain.Artifact{}, validationError("Run update artifact is unavailable or outside distribution scope")
	}
	return update, distribution, artifact, nil
}

func (svc *CoreService) projectDependencyAndRunUpdateResult(job domain.Job, stamp time.Time) error {
	if job.Capability == domain.JobCapabilityDependenciesCheck || job.Capability == domain.JobCapabilityDependenciesInstall {
		status, err := svc.dependencyStatusForJob(job.ID, job.ServerInstanceID)
		if err != nil {
			return err
		}
		status.UpdatedAt = stamp
		status.CheckedAt = stamp
		status.JobID = job.ID
		if job.State == domain.JobStateSucceeded {
			var evidence domain.DependencyExecutionEvidence
			if err := json.Unmarshal([]byte(job.ExecutionResult.Content), &evidence); err != nil {
				return validationError("dependency result evidence is invalid")
			}
			if evidence.ProbeKey != status.ProbeKey || evidence.PlanDigest != status.PlanDigest || job.ExecutionResult.Checksum != status.PlanDigest {
				return validationError("dependency result evidence does not match approved plan")
			}
			status.State = domain.DependencyState(evidence.State)
			status.Evidence = evidence.Evidence
			status.CompletedSteps = evidence.CompletedSteps
			status.Message = "dependency execution completed"
		} else if job.State == domain.JobStateCancelled {
			status.State = domain.DependencyStateFailed
			status.Message = "dependency execution cancelled"
		} else {
			status.State = domain.DependencyStateFailed
			status.Message = "dependency execution failed"
		}
		if err := validator.ValidateDependencyStatus(status); err != nil {
			return err
		}
		if err := svc.store.DependencyStatuses().Update(status); err != nil {
			return err
		}
		return nil
	}
	if job.Capability != domain.JobCapabilityRunSelfUpdate {
		return nil
	}
	update, _, _, err := svc.resolveRunUpdate(job)
	if err != nil {
		return err
	}
	update.UpdatedAt = stamp
	if job.State == domain.JobStateSucceeded {
		var evidence domain.RunUpdateExecutionEvidence
		if err := json.Unmarshal([]byte(job.ExecutionResult.Content), &evidence); err != nil || evidence.TargetRelease != update.TargetRelease || evidence.Phase != "staged" || job.ExecutionResult.Checksum != update.Checksum {
			return validationError("Run update staged evidence is invalid")
		}
		update.Status = domain.DistributionJobStatusRunning
		update.Phase = domain.RunUpdatePhaseRestartRequested
		update.Message = "verified update staged; restart requested"
	} else if job.State == domain.JobStateCancelled {
		update.Status = domain.DistributionJobStatusFailed
		update.Phase = domain.RunUpdatePhaseFailed
		update.Message = "Run update cancelled before activation"
	} else {
		update.Status = domain.DistributionJobStatusFailed
		update.Phase = domain.RunUpdatePhaseFailed
		update.Message = "Run update verification or staging failed"
	}
	if err := validator.ValidateRunUpdateJob(update); err != nil {
		return err
	}
	if err := svc.store.RunUpdateJobs().Update(update); err != nil {
		return err
	}
	return nil
}

func (svc *CoreService) projectDependencyAndRunUpdateProgress(job domain.Job, stamp time.Time) error {
	if job.Capability == domain.JobCapabilityRunSelfUpdate {
		updates, err := svc.store.RunUpdateJobs().List(domain.RunUpdateJobFilter{ServerInstanceID: job.ServerInstanceID})
		if err != nil {
			return err
		}
		for _, update := range updates {
			if update.JobID != job.ID || update.Status != domain.DistributionJobStatusQueued {
				continue
			}
			update.Status = domain.DistributionJobStatusRunning
			update.Phase = domain.RunUpdatePhaseDownloading
			update.Message = "Run is downloading and verifying the update"
			update.UpdatedAt = stamp
			if err := validator.ValidateRunUpdateJob(update); err != nil {
				return err
			}
			return svc.store.RunUpdateJobs().Update(update)
		}
	}
	return nil
}

func (svc *CoreService) ReportRunUpdateHealth(report domain.RunUpdateHealthReport) (domain.RunUpdateHealthResult, error) {
	if err := validator.ValidateRunUpdateHealthReport(report); err != nil {
		return domain.RunUpdateHealthResult{}, err
	}
	if _, err := svc.validatedRunSession(report.RunEndpointID, report.SessionToken); err != nil {
		return domain.RunUpdateHealthResult{}, err
	}

	svc.jobMu.Lock()
	defer svc.jobMu.Unlock()
	job, err := svc.store.Jobs().Get(report.JobID)
	if err != nil {
		return domain.RunUpdateHealthResult{}, err
	}
	if job.RunEndpointID != report.RunEndpointID || job.Capability != domain.JobCapabilityRunSelfUpdate || job.State != domain.JobStateSucceeded || job.Attempt != report.Attempt || !leaseTokenMatches(job.LeaseTokenHash, report.LeaseToken) {
		return domain.RunUpdateHealthResult{}, validationError("Run update health report does not match terminal attempt")
	}
	updates, err := svc.store.RunUpdateJobs().List(domain.RunUpdateJobFilter{ServerInstanceID: job.ServerInstanceID})
	if err != nil {
		return domain.RunUpdateHealthResult{}, err
	}
	var update domain.RunUpdateJob
	for _, candidate := range updates {
		if candidate.JobID == job.ID && candidate.RunEndpointID == report.RunEndpointID {
			update = candidate
			break
		}
	}
	if update.ID == "" || job.ExecutionResult.Checksum != update.Checksum {
		return domain.RunUpdateHealthResult{}, validationError("Run update health report does not match staged update")
	}
	endpoint, err := svc.GetRunEndpoint(report.RunEndpointID)
	if err != nil {
		return domain.RunUpdateHealthResult{}, err
	}
	if endpoint.Version != report.Version || endpoint.Status != domain.RunEndpointStatusOnline {
		return domain.RunUpdateHealthResult{}, validationError("Run update health version does not match online endpoint")
	}
	stamp := svc.now()
	if report.Outcome == "succeeded" {
		if report.Version != update.TargetRelease || update.Phase == domain.RunUpdatePhaseRolledBack || update.Phase == domain.RunUpdatePhaseFailed {
			return domain.RunUpdateHealthResult{}, validationError("Run update health version does not match target release")
		}
		if update.Phase == domain.RunUpdatePhaseSucceeded {
			return domain.RunUpdateHealthResult{Accepted: true, JobID: job.ID, Phase: update.Phase, ServerTime: stamp}, nil
		}
		update.Status = domain.DistributionJobStatusSucceeded
		update.Phase = domain.RunUpdatePhaseSucceeded
		update.Rollback = false
		update.Message = "updated Run registered, reconciled, and reported healthy"
	} else {
		if update.PreviousVersion != "" && report.Version != update.PreviousVersion {
			return domain.RunUpdateHealthResult{}, validationError("rolled-back Run version does not match previous release")
		}
		if update.Phase == domain.RunUpdatePhaseRolledBack {
			return domain.RunUpdateHealthResult{Accepted: true, JobID: job.ID, Phase: update.Phase, ServerTime: stamp}, nil
		}
		update.Status = domain.DistributionJobStatusFailed
		update.Phase = domain.RunUpdatePhaseRolledBack
		update.Rollback = true
		update.Message = "Run update activation failed and previous executable was restored"
	}
	update.UpdatedAt = stamp
	if err := validator.ValidateRunUpdateJob(update); err != nil {
		return domain.RunUpdateHealthResult{}, err
	}
	if err := svc.store.RunUpdateJobs().Update(update); err != nil {
		return domain.RunUpdateHealthResult{}, err
	}
	return domain.RunUpdateHealthResult{Accepted: true, JobID: job.ID, Phase: update.Phase, ServerTime: stamp}, nil
}

func sameRunUpdateTarget(existing, expected domain.RunUpdateJob) bool {
	return existing.ServerInstanceID == expected.ServerInstanceID && existing.RunEndpointID == expected.RunEndpointID && existing.ArtifactID == expected.ArtifactID && existing.Checksum == expected.Checksum && existing.TargetOS == expected.TargetOS && existing.TargetArch == expected.TargetArch && existing.TargetRelease == expected.TargetRelease && existing.JobID == expected.JobID && existing.IdempotencyKey == expected.IdempotencyKey
}

func findRunDistributionForArtifact(distributions []domain.RunDistribution, artifactID string) (domain.RunDistribution, error) {
	for _, distribution := range distributions {
		if distribution.ArtifactID == artifactID && distribution.Status == domain.DistributionStatusAvailable {
			return distribution, nil
		}
	}
	return domain.RunDistribution{}, errors.New("available Run distribution not found")
}