from pathlib import Path

import pytest

from kontextual_engine import (
    Actor,
    ActorType,
    AssetRegistryService,
    AssetRepresentation,
    AuthorizationError,
    Classification,
    ContextEntity,
    ContextEntityType,
    InMemoryAssetRegistryRepository,
    LifecycleState,
    MetadataRecord,
    OperationContext,
    PolicyDecision,
    RepresentationKind,
    Sensitivity,
    SourceReference,
    SQLiteAssetRegistryRepository,
    ValidationError,
)


def test_asset_registry_service_creates_assets_with_versions_and_audit() -> None:
    repo = InMemoryAssetRegistryRepository()
    service = AssetRegistryService(repo)
    context = operation_context()
    source_ref = SourceReference(
        source_system="repo",
        path="docs/intent.md",
        checksum="sha256:source",
    )
    representation = AssetRepresentation.from_content(
        "asset-intent",
        RepresentationKind.SOURCE,
        "text/markdown",
        "# Intent\n",
        storage_ref="object://intent-source",
        source_ref_id=source_ref.id,
    )
    metadata = MetadataRecord(
        "topic",
        "architecture",
        provenance={"producer": "human"},
        confirmed=True,
    )

    result = service.create_asset(
        "Intent",
        Classification(
            asset_type="document",
            sensitivity=Sensitivity.INTERNAL,
            owner="Platform Knowledge",
        ),
        context,
        asset_id="asset-intent",
        source_refs=[source_ref],
        representations=[representation],
        metadata_records=[metadata],
    )

    assert result.asset.id == "asset-intent"
    assert result.asset.current_version_id == result.version.version_id
    assert result.version.sequence == 1
    assert result.audit_event.outcome.value == "success"
    assert result.policy_decision.allowed is True
    assert repo.get_asset("asset-intent").source_refs[0].path == "docs/intent.md"
    assert repo.list_representations(asset_id="asset-intent")[0].storage_ref == "object://intent-source"
    assert repo.list_metadata_records("asset-intent")[0].confirmed is True
    assert repo.list_audit_events(target="asset:asset-intent")[0].operation == "asset.create"


def test_asset_registry_lifecycle_policy_denial_fails_closed_and_audits() -> None:
    repo = InMemoryAssetRegistryRepository()
    service = AssetRegistryService(repo, policy_gateway=DenyLifecyclePolicy())
    context = operation_context()
    created = service.create_asset(
        "Governed Asset",
        Classification(asset_type="document", sensitivity=Sensitivity.CONFIDENTIAL),
        context,
        asset_id="asset-governed",
    )

    with pytest.raises(AuthorizationError) as exc_info:
        service.transition_lifecycle(created.asset.id, LifecycleState.RETIRED, context)

    events = repo.list_audit_events(target="asset:asset-governed")

    assert exc_info.value.details["correlation_id"] == "corr-test"
    assert exc_info.value.details["policy_decision"]["effect"] == "fail_closed"
    assert [event.outcome.value for event in events] == ["success", "denied"]
    assert repo.get_asset("asset-governed").lifecycle == LifecycleState.ACTIVE


def test_asset_registry_create_is_idempotent_for_same_key_and_payload() -> None:
    repo = InMemoryAssetRegistryRepository()
    service = AssetRegistryService(repo)
    context = operation_context()
    classification = Classification(asset_type="document", sensitivity=Sensitivity.PUBLIC)
    source_ref = SourceReference(source_system="repo", path="README.md")
    representation = AssetRepresentation.from_content(
        "asset-readme",
        RepresentationKind.SOURCE,
        "text/markdown",
        "# Readme\n",
    )

    first = service.create_asset(
        "Readme",
        classification,
        context,
        asset_id="asset-readme",
        source_refs=[source_ref],
        representations=[representation],
        idempotency_key="create-readme",
    )
    second = service.create_asset(
        "Readme",
        classification,
        context,
        asset_id="asset-readme",
        source_refs=[source_ref],
        representations=[representation],
        idempotency_key="create-readme",
    )

    assert second.asset.id == first.asset.id
    assert second.version.version_id == first.version.version_id
    assert second.audit_event.event_id == first.audit_event.event_id
    assert len(repo.list_versions("asset-readme")) == 1
    assert len(repo.list_audit_events(target="asset:asset-readme")) == 1

    with pytest.raises(ValidationError, match="Idempotency key"):
        service.create_asset(
            "Readme renamed",
            classification,
            context,
            asset_id="asset-readme",
            source_refs=[source_ref],
            representations=[representation],
            idempotency_key="create-readme",
        )


def test_asset_registry_relationships_create_versions_and_audit() -> None:
    repo = InMemoryAssetRegistryRepository()
    service = AssetRegistryService(repo)
    context = operation_context()
    classification = Classification(asset_type="document", sensitivity=Sensitivity.INTERNAL)
    source = service.create_asset("Source", classification, context, asset_id="asset-source")
    target = service.create_asset("Target", classification, context, asset_id="asset-target")

    result = service.link_asset_to_asset(
        source.asset.id,
        target.asset.id,
        "depends_on",
        context,
        confidence=0.91,
        provenance={"producer": "test"},
    )

    relationships = repo.list_relationships(source_id=source.asset.id)
    versions = repo.list_versions(source.asset.id)

    assert relationships == [result.relationship]
    assert result.relationship.target_id == target.asset.id
    assert result.relationship.confidence == 0.91
    assert versions[-1].change_type.value == "relationship_changed"
    assert versions[-1].relationship_delta["added"]["predicate"] == "depends_on"
    assert repo.get_asset(source.asset.id).current_version_id == result.version.version_id
    assert repo.get_asset(target.asset.id).current_version_id == target.version.version_id
    assert repo.list_audit_events(target=f"asset:{source.asset.id}")[-1].operation == "asset.relationship.add"


def test_sqlite_asset_registry_survives_reinstantiation(tmp_path: Path) -> None:
    db_path = tmp_path / "registry.sqlite"
    repo = SQLiteAssetRegistryRepository(db_path)
    service = AssetRegistryService(repo)
    context = operation_context()
    source_ref = SourceReference(source_system="repo", path="README.md", checksum="sha256:readme")
    source = AssetRepresentation.from_content(
        "asset-readme",
        RepresentationKind.SOURCE,
        "text/markdown",
        "# Readme\n",
        storage_ref="object://readme-source",
    )
    created = service.create_asset(
        "Readme",
        Classification(asset_type="document", sensitivity=Sensitivity.PUBLIC),
        context,
        asset_id="asset-readme",
        source_refs=[source_ref],
        representations=[source],
    )
    service.add_metadata_record(
        created.asset.id,
        MetadataRecord("owner", "Platform Knowledge", confirmed=True),
        context,
    )
    service.request_delete(created.asset.id, context)

    reloaded = SQLiteAssetRegistryRepository(db_path)
    asset = reloaded.get_asset("asset-readme")

    assert asset.lifecycle == LifecycleState.DELETE_REQUESTED
    assert asset.source_refs[0].path == "README.md"
    assert [item.kind for item in reloaded.list_representations(asset_id=asset.id)] == [
        RepresentationKind.SOURCE
    ]
    assert [item.key for item in reloaded.list_metadata_records(asset.id)] == ["owner"]
    assert [version.sequence for version in reloaded.list_versions(asset.id)] == [1, 2, 3]
    assert [event.operation for event in reloaded.list_audit_events(target="asset:asset-readme")] == [
        "asset.create",
        "asset.metadata.add",
        "asset.lifecycle.transition",
    ]


def test_sqlite_registry_persists_context_entities_relationships_and_idempotency(tmp_path: Path) -> None:
    db_path = tmp_path / "registry.sqlite"
    repo = SQLiteAssetRegistryRepository(db_path)
    service = AssetRegistryService(repo)
    context = operation_context()
    created = service.create_asset(
        "Knowledge Policy",
        Classification(asset_type="policy", sensitivity=Sensitivity.INTERNAL),
        context,
        asset_id="asset-policy",
        idempotency_key="create-policy",
    )
    entity = ContextEntity(
        entity_type=ContextEntityType.PROJECT,
        name="Kontextual Engine",
        entity_id="entity-kontextual",
    )
    linked = service.link_asset_to_context_entity(
        created.asset.id,
        entity,
        "about_project",
        context,
    )

    reloaded = SQLiteAssetRegistryRepository(db_path)

    assert reloaded.get_idempotency_record("create-policy").result_refs["asset_id"] == "asset-policy"
    assert reloaded.list_context_entities()[0].entity_id == "entity-kontextual"
    assert reloaded.list_relationships(source_id="asset-policy")[0].relationship_id == linked.relationship.relationship_id
    assert reloaded.list_versions("asset-policy")[-1].relationship_delta["added"]["target_kind"] == "context_entity"
    assert [event.operation for event in reloaded.list_audit_events(target="asset:asset-policy")] == [
        "asset.create",
        "asset.relationship.add",
    ]


def test_sqlite_registry_enforces_representation_asset_reference(tmp_path: Path) -> None:
    repo = SQLiteAssetRegistryRepository(tmp_path / "registry.sqlite")
    representation = AssetRepresentation.from_content(
        "missing-asset",
        RepresentationKind.NORMALIZED,
        "text/plain",
        "normalized",
    )

    with pytest.raises(ValidationError, match="unknown asset"):
        repo.save_representation(representation)


def operation_context() -> OperationContext:
    actor = Actor.create(
        ActorType.HUMAN,
        actor_id="user-test",
        display_name="Test User",
        groups=["engineering"],
    )
    return OperationContext.create(actor, correlation_id="corr-test")


class DenyLifecyclePolicy:
    def authorize(
        self,
        context: OperationContext,
        action: str,
        resource: str,
        *,
        resource_metadata: dict[str, str] | None = None,
    ) -> PolicyDecision:
        if action == "asset.lifecycle.transition":
            return PolicyDecision.fail_closed(
                context.actor.id,
                action,
                resource,
                reason="lifecycle transitions require review",
                context={"resource_metadata": resource_metadata or {}},
            )
        return PolicyDecision.allow(context.actor.id, action, resource)