package service

import (
	"errors"
	"strings"

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

const scumSchemaProbeExecutionKind = "sqlite.schema-probe"

func (svc *CoreService) RequestSCUMSchemaProbeForSession(sessionID, serverInstanceID, idempotencyKey string) (domain.SCUMSchemaProbeRequest, domain.RemoteAdapterResult, error) {
	idempotencyKey = strings.TrimSpace(idempotencyKey)
	if idempotencyKey == "" {
		return domain.SCUMSchemaProbeRequest{}, domain.RemoteAdapterResult{}, validationError("idempotencyKey is required")
	}
	instance, err := svc.GetServerInstanceForSession(sessionID, serverInstanceID)
	if err != nil {
		return domain.SCUMSchemaProbeRequest{}, domain.RemoteAdapterResult{}, err
	}
	plugin, err := svc.store.GamePlugins().Get(instance.PluginID)
	if err != nil {
		return domain.SCUMSchemaProbeRequest{}, domain.RemoteAdapterResult{}, err
	}
	probe := plugin.SCUMLiveData.Probe
	if plugin.SCUMLiveData.SchemaVersion == "" || probe.Capability != domain.JobCapabilityRemoteRunDBSQLiteProbe || strings.TrimSpace(probe.TargetKey) == "" {
		return domain.SCUMSchemaProbeRequest{}, domain.RemoteAdapterResult{}, validationError("SCUM schema probe is not declared by the plugin")
	}
	if !scumSchemaProbeHasDataTarget(plugin.RuntimeProfiles, probe.TargetKey) {
		return domain.SCUMSchemaProbeRequest{}, domain.RemoteAdapterResult{}, validationError("SCUM schema probe target is not declared as a generated Run data target")
	}
	endpoint, err := svc.store.RunEndpoints().Get(instance.RunEndpointID)
	if err != nil {
		return domain.SCUMSchemaProbeRequest{}, domain.RemoteAdapterResult{}, err
	}
	if endpoint.Status != domain.RunEndpointStatusOnline && endpoint.Status != domain.RunEndpointStatusDegraded {
		return domain.SCUMSchemaProbeRequest{}, domain.RemoteAdapterResult{}, validationError("bound Run is not online for SCUM schema probe")
	}
	if !containsString(endpoint.Capabilities, domain.JobCapabilityRemoteRunDBSQLiteProbe) {
		return domain.SCUMSchemaProbeRequest{}, domain.RemoteAdapterResult{}, validationError("bound Run does not expose the generic SQLite schema-probe executor")
	}
	binding, err := svc.runtimeBindingForServer(instance.ID)
	if errors.Is(err, repo.ErrNotFound) {
		return domain.SCUMSchemaProbeRequest{}, domain.RemoteAdapterResult{}, validationError("runtime binding is required before SCUM schema probe")
	}
	if err != nil {
		return domain.SCUMSchemaProbeRequest{}, domain.RemoteAdapterResult{}, err
	}
	adapterVersion := scumSchemaProbeAdapterVersion(plugin.SCUMLiveData)
	if adapterVersion == "" {
		return domain.SCUMSchemaProbeRequest{}, domain.RemoteAdapterResult{}, validationError("SCUM schema-probe adapter version is not declared")
	}
	bounds := probe.Bounds
	if bounds.MaxObjects == 0 {
		bounds = domain.DefaultSCUMSchemaProbeBounds()
	}
	jobID := jobIDFromParts("job-remote-adapter", instance.ID, idempotencyKey)
	request := domain.SCUMSchemaProbeRequest{
		RequestID: jobID,
		JobID:     jobID,
		Binding: domain.SCUMBindingIdentity{
			ServerInstanceID: instance.ID,
			RunBindingID:     binding.ID,
			RunEndpointID:    instance.RunEndpointID,
			PluginID:         plugin.ID,
			PluginVersion:    plugin.Version,
			AdapterVersion:   adapterVersion,
			DatabaseIdentity: scumSchemaProbeDatabaseIdentity(probe.TargetKey),
		},
		Bounds:      bounds,
		RequestedAt: svc.now(),
	}
	if err := validator.ValidateSCUMSchemaProbeRequest(request); err != nil {
		return domain.SCUMSchemaProbeRequest{}, domain.RemoteAdapterResult{}, err
	}
	result, err := svc.RequestRemoteAdapterForSession(sessionID, domain.RemoteAdapterRequest{
		ServerInstanceID:  instance.ID,
		DeclarationKey:    probe.TargetKey,
		TargetKey:         probe.TargetKey,
		Capability:        domain.JobCapabilityRemoteRunDBSQLiteProbe,
		TimeoutSeconds:    scumSchemaProbeTimeoutSeconds(bounds),
		MaxAttempts:       1,
		IdempotencyKey:    idempotencyKey,
		PlatformScheduled: true,
		SQLiteSchemaProbe: &request,
	})
	if err != nil {
		return domain.SCUMSchemaProbeRequest{}, domain.RemoteAdapterResult{}, err
	}
	return request, result, nil
}

func scumSchemaProbeDatabaseIdentity(targetKey string) string {
	trimmed := strings.TrimSpace(targetKey)
	return strings.TrimPrefix(trimmed, "databases/")
}

func scumSchemaProbeHasDataTarget(profiles domain.GamePluginRuntimeProfiles, targetKey string) bool {
	expectedWorkspaceKey := "databases/" + scumSchemaProbeDatabaseIdentity(targetKey)
	for _, target := range profiles.DataTargets {
		if target.Key == targetKey && target.Kind == "sqlite.snapshot" && target.WorkspaceKey == expectedWorkspaceKey && target.RefreshPolicy == "on-demand-snapshot" {
			return true
		}
	}
	return false
}

func scumSchemaProbeAdapterVersion(manifest domain.SCUMLiveDataManifest) string {
	for _, gate := range manifest.CapabilityGates {
		if gate.Capability == domain.SCUMDataCapabilitySchemaProbe {
			return strings.TrimSpace(gate.AdapterVersion)
		}
	}
	for _, gate := range manifest.CapabilityGates {
		if strings.TrimSpace(gate.AdapterVersion) != "" {
			return strings.TrimSpace(gate.AdapterVersion)
		}
	}
	return ""
}

func scumSchemaProbeTimeoutSeconds(bounds domain.SCUMSchemaProbeBounds) int {
	if bounds.TimeoutMS <= 0 {
		return 1
	}
	seconds := (bounds.TimeoutMS + 999) / 1000
	if seconds <= 0 {
		return 1
	}
	return seconds
}

func validateSCUMSchemaProbeResultForJob(job domain.Job, result domain.SCUMSchemaProbeResult) error {
	if err := validator.ValidateSCUMSchemaProbeResult(result); err != nil {
		return err
	}
	expected := job.ExecutionInput.SQLiteSchemaProbe
	if expected == nil {
		return validationError("SQLite schema probe request is missing from leased job")
	}
	if result.JobID != job.ID || result.JobID != expected.JobID || result.RequestID != expected.RequestID {
		return validationError("SQLite schema probe result does not match leased job identity")
	}
	if !sameSCUMSchemaProbeBinding(result.Binding, expected.Binding) {
		return validationError("SQLite schema probe result does not match leased binding identity")
	}
	return nil
}

func sameSCUMSchemaProbeBinding(a, b domain.SCUMBindingIdentity) bool {
	return a.ServerInstanceID == b.ServerInstanceID && a.RunBindingID == b.RunBindingID && a.RunEndpointID == b.RunEndpointID && a.PluginID == b.PluginID && a.PluginVersion == b.PluginVersion && a.AdapterVersion == b.AdapterVersion && a.GameVersion == b.GameVersion && a.DatabaseIdentity == b.DatabaseIdentity
}