import com.correx.core.approvals.ApprovalProjector
import com.correx.core.approvals.DefaultApprovalReducer
import com.correx.core.approvals.DefaultApprovalRepository
import com.correx.core.approvals.domain.DefaultApprovalEngine
import com.correx.core.artifacts.DefaultArtifactReducer
import com.correx.core.context.builder.ContextPackBuilder
import com.correx.core.context.model.ContextEntry
import com.correx.core.context.model.ContextLayer
import com.correx.core.context.model.ContextPack
import com.correx.core.context.model.TokenBudget
import com.correx.core.events.events.ExecutionPlanLockedEvent
import com.correx.core.events.events.EventMetadata
import com.correx.core.events.events.NewEvent
import com.correx.core.events.events.SteeringNoteAddedEvent
import com.correx.core.events.execution.RetryPolicy
import com.correx.core.events.types.ArtifactId
import com.correx.core.events.types.ContextPackId
import com.correx.core.events.types.EventId
import com.correx.core.events.types.SessionId
import com.correx.core.events.types.StageId
import com.correx.core.inference.InferenceRepository
import com.correx.core.inference.InferenceState
import com.correx.core.inference.ModelCapability
import com.correx.core.journal.DecisionJournalProjector
import com.correx.core.journal.DefaultDecisionJournalReducer
import com.correx.core.journal.DefaultDecisionJournalRepository
import com.correx.core.kernel.orchestration.DefaultOrchestrationReducer
import com.correx.core.kernel.orchestration.DefaultSessionOrchestrator
import com.correx.core.kernel.orchestration.OrchestrationConfig
import com.correx.core.kernel.orchestration.OrchestrationProjector
import com.correx.core.kernel.orchestration.OrchestrationRepository
import com.correx.core.kernel.orchestration.OrchestratorEngines
import com.correx.core.kernel.orchestration.OrchestratorRepositories
import com.correx.core.kernel.retry.DefaultRetryCoordinator
import com.correx.core.risk.DefaultRiskAssessor
import com.correx.core.sessions.DefaultSessionRepository
import com.correx.core.sessions.projections.replay.DefaultEventReplayer
import com.correx.core.sessions.projections.replay.EventReplayer
import com.correx.core.transitions.graph.StageConfig
import com.correx.core.transitions.graph.TransitionEdge
import com.correx.core.transitions.graph.WorkflowGraph
import com.correx.core.validation.pipeline.ValidationPipeline
import com.correx.infrastructure.persistence.InMemoryEventStore
import com.correx.infrastructure.persistence.artifact.LiveArtifactRepository
import com.correx.testing.contracts.fixtures.artifactstore.NoopArtifactStore
import com.correx.testing.fixtures.cyclePolicyMissingValidator
import com.correx.testing.fixtures.inference.MockInferenceProvider
import com.correx.testing.fixtures.transitions.TransitionFixtures
import com.correx.testing.kernel.MockSessionEventReplayer
import kotlinx.coroutines.runBlocking
import kotlinx.datetime.Clock
import org.junit.jupiter.api.Assertions.assertTrue
import org.junit.jupiter.api.Test
import java.util.UUID

/**
 * Verifies that a [SteeringNoteAddedEvent] emitted after an [ExecutionPlanLockedEvent] is
 * injected into the stage context as a pinned L0/SYSTEM "PRIORITY DIRECTIVE" entry, while
 * a pre-lock steering note retains the original L2/SYSTEM form.
 */
class SteeringPreemptionTest {

    private val capturedEntries = mutableListOf<ContextEntry>()

    private val capturingBuilder = object : ContextPackBuilder {
        override fun build(
            id: ContextPackId,
            sessionId: SessionId,
            stageId: StageId,
            entries: List<ContextEntry>,
            budget: TokenBudget,
        ): ContextPack {
            capturedEntries.addAll(entries)
            return ContextPack(
                id = id,
                sessionId = sessionId,
                stageId = stageId,
                layers = emptyMap(),
                budgetUsed = 0,
                budgetLimit = budget.limit,
            )
        }
    }

    private val eventStore = InMemoryEventStore()
    private val sessionReplayer = MockSessionEventReplayer()
    private val sessionRepository = DefaultSessionRepository(sessionReplayer)
    private val orchestrationRepository = OrchestrationRepository(
        DefaultEventReplayer(eventStore, OrchestrationProjector(DefaultOrchestrationReducer())),
    )
    private val inferenceRepository = InferenceRepository(
        object : EventReplayer<InferenceState> {
            override fun rebuild(sessionId: SessionId) = InferenceState()
        },
    )
    private val approvalRepository = DefaultApprovalRepository(
        DefaultEventReplayer(eventStore, ApprovalProjector(DefaultApprovalReducer())),
    )
    private val decisionJournalRepository = DefaultDecisionJournalRepository(
        DefaultEventReplayer(eventStore, DecisionJournalProjector(DefaultDecisionJournalReducer())),
    )
    private val artifactStore = NoopArtifactStore()
    private val retryCoordinator = DefaultRetryCoordinator(eventStore)

    private val repositories = OrchestratorRepositories(
        eventStore = eventStore,
        inferenceRepository = inferenceRepository,
        orchestrationRepository = orchestrationRepository,
        sessionRepository = sessionRepository,
        artifactRepository = LiveArtifactRepository(eventStore, DefaultArtifactReducer()),
        approvalRepository = approvalRepository,
    )

    private fun buildOrchestrator(inferenceRouter: com.correx.core.inference.InferenceRouter) =
        DefaultSessionOrchestrator(
            repositories = repositories,
            engines = OrchestratorEngines(
                transitionResolver = TransitionFixtures.simpleResolver(),
                contextPackBuilder = capturingBuilder,
                inferenceRouter = inferenceRouter,
                validationPipeline = ValidationPipeline(validators = listOf(cyclePolicyMissingValidator())),
                approvalEngine = DefaultApprovalEngine(),
                riskAssessor = DefaultRiskAssessor(),
            ),
            retryCoordinator = retryCoordinator,
            artifactStore = artifactStore,
            decisionJournalRepository = decisionJournalRepository,
        )

    private val defaultConfig = OrchestrationConfig(
        retryPolicy = RetryPolicy(maxAttempts = 1, backoffMs = 0),
    )

    private suspend fun appendEvent(sessionId: SessionId, payload: com.correx.core.events.events.EventPayload) {
        eventStore.append(
            NewEvent(
                metadata = EventMetadata(
                    eventId = EventId(UUID.randomUUID().toString()),
                    sessionId = sessionId,
                    timestamp = Clock.System.now(),
                    schemaVersion = 1,
                    causationId = null,
                    correlationId = null,
                ),
                payload = payload,
            ),
        )
    }

    @Test
    fun `post-lock steering note is injected as L0 PRIORITY DIRECTIVE`(): Unit = runBlocking {
        val sessionId = SessionId("steering-preemption-1")
        val stageA = StageId("A")

        val graph = WorkflowGraph(
            id = "steering-preemption-test",
            stages = mapOf(stageA to StageConfig()),
            transitions = emptySet(),
            start = stageA,
        )

        appendEvent(
            sessionId,
            ExecutionPlanLockedEvent(
                sessionId = sessionId,
                planArtifactId = ArtifactId("plan"),
                workflowId = "steering-preemption-test",
                stageIds = listOf(stageA.value),
                startStageId = stageA.value,
            ),
        )
        appendEvent(
            sessionId,
            SteeringNoteAddedEvent(
                sessionId = sessionId,
                content = "use postgres not sqlite",
            ),
        )

        val router = object : com.correx.core.inference.InferenceRouter {
            override suspend fun route(
                stageId: StageId,
                requiredCapabilities: Set<ModelCapability>,
            ) = MockInferenceProvider(fixedResponse = "done")
        }

        buildOrchestrator(router).run(sessionId, graph, defaultConfig)

        val steeringEntries = capturedEntries.filter { it.sourceType == "steeringNote" }
        assertTrue(steeringEntries.isNotEmpty(), "Expected at least one steeringNote entry")
        val postLockEntry = steeringEntries.find { it.content.contains("PRIORITY DIRECTIVE") }
        assertTrue(
            postLockEntry != null,
            "Expected a steeringNote entry with 'PRIORITY DIRECTIVE', got: ${steeringEntries.map { it.content }}",
        )
        assertTrue(
            postLockEntry!!.content.contains("use postgres not sqlite"),
            "Expected steering text in entry, got: ${postLockEntry.content}",
        )
        assertTrue(
            postLockEntry.layer == ContextLayer.L0,
            "Expected post-lock steering note at L0, got: ${postLockEntry.layer}",
        )
    }

    @Test
    fun `pre-lock steering note keeps L2 SYSTEM form`(): Unit = runBlocking {
        val sessionId = SessionId("steering-preemption-2")
        val stageA = StageId("A")

        val graph = WorkflowGraph(
            id = "steering-preemption-test-2",
            stages = mapOf(stageA to StageConfig()),
            transitions = emptySet(),
            start = stageA,
        )

        appendEvent(
            sessionId,
            SteeringNoteAddedEvent(
                sessionId = sessionId,
                content = "prefer immutable data",
            ),
        )
        // No ExecutionPlanLockedEvent — note is pre-lock

        val router = object : com.correx.core.inference.InferenceRouter {
            override suspend fun route(
                stageId: StageId,
                requiredCapabilities: Set<ModelCapability>,
            ) = MockInferenceProvider(fixedResponse = "done")
        }

        buildOrchestrator(router).run(sessionId, graph, defaultConfig)

        val steeringEntries = capturedEntries.filter { it.sourceType == "steeringNote" }
        assertTrue(steeringEntries.isNotEmpty(), "Expected at least one steeringNote entry")
        val preLockEntry = steeringEntries.find { it.content.contains("prefer immutable data") }
        assertTrue(
            preLockEntry != null,
            "Expected a steeringNote entry with pre-lock content",
        )
        assertTrue(
            !preLockEntry!!.content.contains("PRIORITY DIRECTIVE"),
            "Pre-lock steering note must not contain 'PRIORITY DIRECTIVE', got: ${preLockEntry.content}",
        )
        assertTrue(
            preLockEntry.layer == ContextLayer.L2,
            "Expected pre-lock steering note at L2, got: ${preLockEntry.layer}",
        )
    }
}