import { connectionIntentService } from "./connection-intents.js";
import { connectionContinuationPendingResponse, findSatisfiedToolConnection, satisfiedConnectionIntentService } from "./satisfied-connection-intents.js";
import { isAiConnectionConfigurationFailure } from "./ai-auth-failure.js";
import { and, eq, isNull, lte, asc, inArray, notInArray, desc, sql } from "drizzle-orm";
import { connectionIntentDeliveries, issueThreadInteractions, issues, agentWakeupRequests, companyMemberships, heartbeatRuns, chatConversations, chatEndpoints, type Db } from "@paperclipai/db";
import type { heartbeatService } from "./heartbeat.js";
import { issueService } from "./issues.js";
import { issueRecoveryActionService } from "./issue-recovery-actions.js";
import { logActivity, publishActivity, type ActivityPublication } from "./activity-log.js";
type Heartbeat = ReturnType<typeof heartbeatService>;

export async function wakeConnectionIntentAfterResolution(
  heartbeat: Pick<Heartbeat, "wakeup">,
  input: {
    loaded: {
      issue: { id: string; assigneeAgentId: string | null; status: string };
      interaction: { id: string; resolvedAt?: string | Date | null; payload?: unknown; addresseeUserId?: string | null };
    };
    status: string;
    actorId: string;
    actorType?: "user" | "system";
  },
) {
  const agentId = input.loaded.issue.assigneeAgentId;
  if (!agentId || !["in_progress", "in_review"].includes(input.loaded.issue.status)) return;
  const resolvedAt = input.loaded.interaction.resolvedAt;
  const interactionResolvedAt = resolvedAt instanceof Date ? resolvedAt.toISOString() : resolvedAt;
  const payload = input.loaded.interaction.payload;
  const repairsProviderAuthentication = payload !== null && typeof payload === "object" && "purpose" in payload && payload.purpose === "ai";
  await heartbeat.wakeup(agentId, {
    source: "automation",
    triggerDetail: "system",
    reason: "issue_commented",
    payload: {
      issueId: input.loaded.issue.id,
      interactionId: input.loaded.interaction.id,
      interactionKind: "connection_intent",
      interactionStatus: input.status,
      mutation: "interaction",
    },
    idempotencyKey: `connection-intent:${input.loaded.interaction.id}:${input.status}`,
    requestedByActorType: input.actorType ?? "user",
    requestedByActorId: input.actorId,
    contextSnapshot: {
      issueId: input.loaded.issue.id,
      taskId: input.loaded.issue.id,
      interactionId: input.loaded.interaction.id,
      interactionKind: "connection_intent",
      interactionStatus: input.status,
      mutation: "interaction",
      wakeReason: "issue_commented",
      source: "connection_intent.resolved",
      ...(input.actorType === "system" && input.loaded.interaction.addresseeUserId
        ? { responsibleUserId: input.loaded.interaction.addresseeUserId, connectionIntentResolution: "existing_connection" }
        : {}),
      ...(interactionResolvedAt
        ? { interactionResolvedAt }
        : {}),
      // Provider authentication repair retains its existing restart fence.
      // Tool access alone asks the harness to refresh tools on recovery.
      ...(repairsProviderAuthentication ? { forceFreshSession: true } : { refreshTools: true }),
    },
    issueStateGuard: {
      statuses: ["in_progress", "in_review"],
      assigneeAgentId: agentId,
    },
  });
}


export function connectionIntentDeliveryService(db: Db, heartbeat: Pick<Heartbeat, "wakeup">) {
  const satisfiedIntents = satisfiedConnectionIntentService(db);
  // Only a repaired AI-authentication failure may reopen a blocked task. An old
  // card must never resume a newer failure, a reassignment, or a manual hold.
  async function restoreAiBlockedTask(loaded: {
    issue: typeof issues.$inferSelect;
    interaction: typeof issueThreadInteractions.$inferSelect;
  }) {
    const publications: ActivityPublication[] = [];
    const restored = await db.transaction(async (tx) => {
      const [issue] = await tx.select().from(issues).where(and(
        eq(issues.id, loaded.issue.id), eq(issues.companyId, loaded.issue.companyId),
      )).for("update");
      if (!issue || issue.status !== "blocked" || issue.assigneeAgentId !== loaded.issue.assigneeAgentId) return null;
      const [latest] = await tx.select().from(heartbeatRuns).where(and(
        eq(heartbeatRuns.companyId, issue.companyId),
        sql`coalesce(${heartbeatRuns.contextSnapshot}->>'issueId', ${heartbeatRuns.contextSnapshot}->>'taskId') = ${issue.id}`,
      )).orderBy(desc(heartbeatRuns.createdAt)).limit(1);
      if (latest?.id !== loaded.interaction.sourceRunId || latest.status !== "failed"
        || !isAiConnectionConfigurationFailure(latest)) return null;
      // Restricted external chat retries require their original chat provenance.
      // Their existing Try again path owns that authorization and delivery.
      const [restrictedChat] = await tx.select({ id: chatConversations.id }).from(chatConversations)
        .innerJoin(chatEndpoints, eq(chatEndpoints.id, chatConversations.endpointId))
        .where(and(eq(chatConversations.companyId, issue.companyId), eq(chatConversations.issueId, issue.id),
          eq(chatEndpoints.externalExecutionPolicy, "restricted"))).limit(1);
      if (restrictedChat) return null;
      const recoveries = issueRecoveryActionService(db);
      const recovery = await recoveries.getActiveForIssue(issue.companyId, issue.id, tx);
      if (!recovery || recovery.cause !== "configuration_incomplete" || recovery.evidence.latestRunId !== latest.id) return null;
      const actorId = loaded.interaction.resolvedByUserId ?? loaded.interaction.addresseeUserId!;
      const updated = await issueService(db).update(issue.id, {
        status: "in_progress", actorUserId: actorId, companyGuard: issue.companyId,
      }, tx, publications);
      await recoveries.resolveActiveForIssue({ companyId: issue.companyId, sourceIssueId: issue.id,
        actionId: recovery.id, status: "resolved", outcome: "restored", resolutionNote: "AI connection restored by the responsible user." }, tx);
      return updated;
    });
    for (const publication of publications) publishActivity(publication);
    if (restored) await logActivity(db, { companyId: restored.companyId, actorType: "user",
      actorId: loaded.interaction.resolvedByUserId ?? loaded.interaction.addresseeUserId!,
      action: "issue.updated", entityType: "issue", entityId: restored.id,
      details: { status: restored.status, _previous: { status: "blocked" }, source: "ai_connection_restored", interactionId: loaded.interaction.id } });
    return restored;
  }

  async function deliver(interactionId: string) {
    // Deterministic acceptance-test failpoint: preserve committed outcomes across a server restart.
    if (process.env.NODE_ENV === "test" && process.env.PAPERCLIP_TEST_CONNECTION_DELIVERY_HOLD === "1") return;
    const now = new Date();
    // The retry deadline is also the worker lease. A crashed worker is reclaimed.
    const [claimed] = await db.update(connectionIntentDeliveries)
      .set({ nextAttemptAt: new Date(now.getTime() + 60_000) })
      .where(and(eq(connectionIntentDeliveries.interactionId, interactionId), isNull(connectionIntentDeliveries.deliveredAt), lte(connectionIntentDeliveries.nextAttemptAt, now))).returning();
    if (!claimed) return;
    const [loaded] = await db.select({ interaction: issueThreadInteractions, issue: issues })
      .from(issueThreadInteractions).innerJoin(issues, eq(issues.id, issueThreadInteractions.issueId))
      .where(and(eq(issueThreadInteractions.id, interactionId), eq(issueThreadInteractions.companyId, claimed.companyId), eq(issues.companyId, claimed.companyId)));
    let interaction = loaded?.interaction;
    const retiredForAvailableConnection = interaction?.status === "expired"
      && interaction.result?.outcome === "expired" && "connectionId" in interaction.result
      && typeof interaction.result.connectionId === "string";
    const payload = interaction?.payload as { requestingAgentId?: string; serviceSlug?: string; purpose?: "ai" } | undefined;
    if (!loaded || !interaction || (!retiredForAvailableConnection && !["accepted", "rejected"].includes(interaction.status))
      || ["done", "cancelled"].includes(loaded.issue.status) || loaded.issue.assigneeAgentId !== payload?.requestingAgentId) {
      await db.update(connectionIntentDeliveries).set({ deliveredAt: new Date() }).where(and(eq(connectionIntentDeliveries.interactionId, interactionId),
        eq(connectionIntentDeliveries.companyId, claimed.companyId),
        eq(connectionIntentDeliveries.nextAttemptAt, claimed.nextAttemptAt), isNull(connectionIntentDeliveries.deliveredAt)));
      return;
    }
    const userId = interaction.addresseeUserId;
    if (userId !== "local-board") {
      const [membership] = await db.select().from(companyMemberships).where(and(
        eq(companyMemberships.companyId, claimed.companyId), eq(companyMemberships.principalType, "user"),
        eq(companyMemberships.principalId, userId ?? ""), eq(companyMemberships.status, "active"),
      )).limit(1);
      if (!membership?.membershipRole || membership.membershipRole === "viewer") {
        await db.update(connectionIntentDeliveries).set({ deliveredAt: new Date() }).where(and(eq(connectionIntentDeliveries.interactionId, interactionId),
        eq(connectionIntentDeliveries.companyId, claimed.companyId),
        eq(connectionIntentDeliveries.nextAttemptAt, claimed.nextAttemptAt), isNull(connectionIntentDeliveries.deliveredAt)));
        return;
      }
    }
    if (interaction.status === "accepted") {
      const ready = await connectionIntentService(db).usableConnectionForAgent({ companyId: claimed.companyId,
        agentId: payload!.requestingAgentId!, responsibleUserId: userId!, serviceSlug: payload!.serviceSlug!, purpose: payload!.purpose });
      if (!ready) return;
    }
    if (retiredForAvailableConnection) {
      const publications: ActivityPublication[] = [];
      const current = await db.transaction(async tx => {
        const [task] = await tx.select().from(issues).where(and(eq(issues.id, loaded.issue.id), eq(issues.companyId, claimed.companyId))).for("update");
        const [card] = await tx.select().from(issueThreadInteractions).where(and(
          eq(issueThreadInteractions.id, interactionId), eq(issueThreadInteractions.companyId, claimed.companyId),
          eq(issueThreadInteractions.issueId, loaded.issue.id))).for("update");
        if (!task || !card || card.status !== "expired" || card.result?.outcome !== "expired") return null;
        const ready = await findSatisfiedToolConnection(tx as unknown as Db, task, { ...card, status: "pending" });
        if (!ready) return null;
        if (ready.id !== (card.result as { connectionId: string }).connectionId) {
          const previousConnectionId = (card.result as { connectionId: string }).connectionId;
          // This is a system observation of existing access. It grants nothing
          // and never changes or impersonates a human decision.
          const [updated] = await tx.update(issueThreadInteractions).set({ result: { ...card.result,
            connectionId: ready.id }, updatedAt: new Date() }).where(eq(issueThreadInteractions.id, card.id)).returning();
          Object.assign(card, updated);
          await logActivity(tx as unknown as Db, { companyId: claimed.companyId, actorType: "system", actorId: "connection-reconciliation",
            action: "issue.thread_interaction_resolved", entityType: "issue", entityId: task.id,
            details: { interactionId, interactionKind: "connection_intent", status: "expired", connectionId: ready.id,
              previousConnectionId, resolutionSource: "existing_connection_refreshed" } }, publications);
        }
        return { task, card, waiting: await connectionContinuationPendingResponse(tx as unknown as Db, task, card.addresseeUserId, card.sourceRunId) };
      });
      for (const publication of publications) publishActivity(publication);
      if (!current || current.waiting) return;
      loaded.issue = current.task;
      loaded.interaction = current.card;
      interaction = current.card;
    }
    if (interaction.status === "accepted" && payload?.purpose === "ai" && loaded.issue.status === "blocked") {
      const restored = await restoreAiBlockedTask(loaded);
      if (!restored) return;
      loaded.issue = restored;
    }
    if (!["in_progress", "in_review"].includes(loaded.issue.status)) return;
    const durableWake = () => db.select({ id: agentWakeupRequests.id }).from(agentWakeupRequests).where(and(
      eq(agentWakeupRequests.companyId, claimed.companyId),
      eq(agentWakeupRequests.idempotencyKey, `connection-intent:${interactionId}:${interaction.status}`),
      notInArray(agentWakeupRequests.status, ["skipped", "failed", "cancelled"]),
    )).limit(1);
    // Check before dispatch: the previous worker may have crashed after enqueueing.
    if (!(await durableWake()).length) {
      try {
        await wakeConnectionIntentAfterResolution(heartbeat, { loaded, status: interaction.status,
          actorId: retiredForAvailableConnection ? "connection-reconciliation" : interaction.resolvedByUserId ?? interaction.addresseeUserId!,
          ...(retiredForAvailableConnection ? { actorType: "system" as const } : {}),
        });
      } catch (error) {
        // The unique wake key also protects overlapping leases. Other failures retry.
        if (!(await durableWake()).length) throw error;
      }
    }
    if ((await durableWake()).length) {
      await db.update(connectionIntentDeliveries).set({ deliveredAt: new Date() }).where(and(eq(connectionIntentDeliveries.interactionId, interactionId),
        eq(connectionIntentDeliveries.companyId, claimed.companyId),
        eq(connectionIntentDeliveries.nextAttemptAt, claimed.nextAttemptAt), isNull(connectionIntentDeliveries.deliveredAt)));
    }
  }
  async function hasPending() {
    if ((await db.select({ id: connectionIntentDeliveries.interactionId }).from(connectionIntentDeliveries)
      .where(isNull(connectionIntentDeliveries.deliveredAt)).limit(1)).length > 0) return true;
    return (await db.select({ id: issueThreadInteractions.id }).from(issueThreadInteractions)
      .innerJoin(issues, and(eq(issues.id, issueThreadInteractions.issueId), eq(issues.companyId, issueThreadInteractions.companyId)))
      .where(and(eq(issueThreadInteractions.kind, "connection_intent"), eq(issueThreadInteractions.status, "pending"),
        inArray(issues.status, ["in_progress", "in_review"]), isNull(issues.assigneeUserId)))
      .limit(1)).length > 0;
  }
  return { deliver, hasPending, tryDeliver: async (id: string) => { try { await deliver(id); } catch { /* Persisted delivery remains due after its lease. */ } }, sweepPending: async () => {
    await satisfiedIntents.sweepPending();
    const rows = await db.select().from(connectionIntentDeliveries).where(and(isNull(connectionIntentDeliveries.deliveredAt), lte(connectionIntentDeliveries.nextAttemptAt, new Date())))
      .orderBy(asc(connectionIntentDeliveries.nextAttemptAt)).limit(50);
    let failed = 0;
    for (const row of rows) { try { await deliver(row.interactionId); } catch { failed += 1; } }
    return { scanned: rows.length, failed };
  }};
}