package keycloak_test

import (
	"context"
	"errors"
	"testing"

	"github.com/netkingdom/flex-auth/internal/adapters/keycloak"
	"github.com/netkingdom/flex-auth/pkg/api"
)

func TestBuildAuthorizationRequestUsesUMAPermissionShape(t *testing.T) {
	adapter := newAdapter(t, &fakeClient{})

	got, err := adapter.BuildAuthorizationRequest(api.CheckRequest{
		ID:            "check:keycloak",
		Subject:       api.SubjectRef{ID: "user:alice"},
		Action:        "read",
		Resource:      api.ResourceRef{ID: "document:internal-note", Type: "document", System: "markitect-tool"},
		Context:       map[string]any{"purpose": "support"},
		CaringContext: caringDescriptor(),
	})
	if err != nil {
		t.Fatalf("BuildAuthorizationRequest: %v", err)
	}
	if got.Realm != "platform" || got.Audience != "markitect-tool" {
		t.Fatalf("realm/audience = %s/%s", got.Realm, got.Audience)
	}
	if got.Permission.ResourceID != "document:internal-note" || got.Permission.Scope != "read" {
		t.Fatalf("permission = %+v", got.Permission)
	}
	if got.ClaimToken["caring_context"] == nil {
		t.Fatal("claim token missing CARING context")
	}
}

func TestResourceRegistrationsFromManifest(t *testing.T) {
	got := keycloak.ResourceRegistrationsFromManifest(api.ResourceManifest{
		ID:      "manifest:markitect",
		System:  "markitect-tool",
		Actions: []string{"read", "export"},
		Resources: []api.Resource{
			{
				ID:        "document:internal-note",
				Type:      "document",
				Path:      "/docs/internal-note",
				Labels:    []string{"internal"},
				TrustZone: "internal",
				Owner:     "team:platform",
			},
		},
	})
	if len(got) != 1 {
		t.Fatalf("len = %d", len(got))
	}
	if got[0].ID != "document:internal-note" || got[0].Type != "document" {
		t.Fatalf("registration = %+v", got[0])
	}
	if len(got[0].Scopes) != 2 || got[0].Attributes["trust_zone"][0] != "internal" {
		t.Fatalf("registration = %+v", got[0])
	}
}

func TestAdapterCheckWrapsKeycloakAllow(t *testing.T) {
	client := &fakeClient{
		result: keycloak.AuthorizationResult{
			Allowed:       true,
			Reason:        "uma_permission_granted",
			RPTTokenID:    "rpt:123",
			PolicyVersion: "kc-v2",
			Diagnostics:   map[string]any{"policy": "document-reader"},
		},
	}
	adapter := newAdapter(t, client)

	got, err := adapter.Check(context.Background(), api.CheckRequest{
		ID:            "check:allow",
		Subject:       api.SubjectRef{ID: "user:alice"},
		Action:        "read",
		Resource:      api.ResourceRef{ID: "document:internal-note", Type: "document", System: "markitect-tool"},
		CaringContext: caringDescriptor(),
	})
	if err != nil {
		t.Fatalf("Check: %v", err)
	}
	if got.Effect != api.DecisionEffectAllow || got.Reason != "uma_permission_granted" {
		t.Fatalf("decision = %s/%s", got.Effect, got.Reason)
	}
	if got.Provenance.Evaluator != keycloak.EvaluatorName || got.MatchedPolicyVersion != "kc-v2" {
		t.Fatalf("provenance = %+v matched=%s", got.Provenance, got.MatchedPolicyVersion)
	}
	if got.Diagnostics["permission"] != "document:internal-note#read" || got.Diagnostics["rpt_token_id"] != "rpt:123" {
		t.Fatalf("diagnostics = %+v", got.Diagnostics)
	}
	if got.Caring == nil || got.Caring.Descriptor == nil {
		t.Fatal("missing CARING descriptor")
	}
}

func TestAdapterFailsClosedOnUnavailableKeycloak(t *testing.T) {
	client := &fakeClient{
		err: keycloak.NewBackendError(keycloak.FailureUnavailable, "authorize", errors.New("connect refused")),
	}
	adapter := newAdapter(t, client)

	got, err := adapter.Check(context.Background(), api.CheckRequest{
		ID:            "check:down",
		Subject:       api.SubjectRef{ID: "user:alice"},
		Action:        "read",
		Resource:      api.ResourceRef{ID: "document:internal-note", Type: "document", System: "markitect-tool"},
		CaringContext: caringDescriptor(),
	})
	if err != nil {
		t.Fatalf("Check: %v", err)
	}
	if got.Effect != api.DecisionEffectDeny || got.Reason != "keycloak_unavailable" {
		t.Fatalf("decision = %s/%s; want fail closed", got.Effect, got.Reason)
	}
	if got.Diagnostics["keycloak_failure"] != "unavailable" {
		t.Fatalf("diagnostics = %+v", got.Diagnostics)
	}
	if got.Caring.ConformanceFindings[0].Code != "KEYCLOAK-UNAVAILABLE" {
		t.Fatalf("finding = %+v", got.Caring.ConformanceFindings[0])
	}
}

func TestRegisterResourceManifestDelegatesToClient(t *testing.T) {
	client := &fakeClient{}
	adapter := newAdapter(t, client)

	report, err := adapter.RegisterResourceManifest(context.Background(), api.ResourceManifest{
		System:  "markitect-tool",
		Actions: []string{"read"},
		Resources: []api.Resource{
			{ID: "document:internal-note", Type: "document"},
		},
	})
	if err != nil {
		t.Fatalf("RegisterResourceManifest: %v", err)
	}
	if report.ResourcesWritten != 1 || len(client.registered) != 1 {
		t.Fatalf("report = %+v registered = %+v", report, client.registered)
	}
}

func newAdapter(t *testing.T, client *fakeClient) *keycloak.Adapter {
	t.Helper()
	adapter, err := keycloak.New(client, keycloak.Options{
		Realm:         "platform",
		Audience:      "markitect-tool",
		PolicyPackage: "keycloak.authz",
		PolicyVersion: "v1",
	})
	if err != nil {
		t.Fatalf("New: %v", err)
	}
	return adapter
}

func caringDescriptor() *api.CaringAccessDescriptor {
	return &api.CaringAccessDescriptor{
		ID:                   "descriptor:keycloak-reader",
		Profile:              api.CaringProfileCaring040RC2,
		SubjectType:          api.SubjectTypeHuman,
		OrganizationRelation: api.OrganizationRelationCustomer,
		CanonicalRole:        api.CanonicalRoleDoer,
		Scope:                api.CaringScope{Level: api.ScopeLevelResource, ID: "document:internal-note"},
		Planes:               []api.Plane{api.PlaneData},
		Capabilities:         []api.Capability{api.CapabilityView},
		ExposureModes:        []api.ExposureMode{api.ExposureModeMasked},
		Restrictions:         []api.Restriction{api.RestrictionExportBlocked},
	}
}

type fakeClient struct {
	result     keycloak.AuthorizationResult
	err        error
	registered []keycloak.ResourceRegistration
}

func (c *fakeClient) Authorize(context.Context, keycloak.AuthorizationRequest) (keycloak.AuthorizationResult, error) {
	return c.result, c.err
}

func (c *fakeClient) RegisterResources(_ context.Context, resources []keycloak.ResourceRegistration) (keycloak.ResourceImportReport, error) {
	c.registered = append([]keycloak.ResourceRegistration(nil), resources...)
	return keycloak.ResourceImportReport{ResourcesWritten: len(resources), ResourceServerID: "rs:markitect"}, nil
}

func (c *fakeClient) Health(context.Context) error {
	return nil
}