import { randomUUID } from "node:crypto";
import { eq, sql } from "drizzle-orm";
import { afterAll, afterEach, beforeAll, describe, expect, it, vi } from "vitest";
import {
  activityLog,
  agents,
  agentRuntimeState,
  agentWakeupRequests,
  companies,
  companySkills,
  createDb,
  documentRevisions,
  documents,
  heartbeatRunEvents,
  heartbeatRuns,
  issueComments,
  issueDocuments,
  issueRelations,
  issueTreeHolds,
  issues,
} from "@paperclipai/db";
import {
  getEmbeddedPostgresTestSupport,
  startEmbeddedPostgresTestDatabase,
} from "./helpers/embedded-postgres.js";
import { heartbeatService } from "../services/heartbeat.ts";
import { runningProcesses } from "../adapters/index.ts";

const mockAdapterExecute = vi.hoisted(() =>
  vi.fn(async () => ({
    exitCode: 0,
    signal: null,
    timedOut: false,
    errorMessage: null,
    summary: "Stale-queue invalidation test run.",
    provider: "test",
    model: "test-model",
  })),
);

vi.mock("../adapters/index.ts", async () => {
  const actual = await vi.importActual<typeof import("../adapters/index.ts")>("../adapters/index.ts");
  return {
    ...actual,
    getServerAdapter: vi.fn(() => ({
      supportsLocalAgentJwt: false,
      execute: mockAdapterExecute,
    })),
  };
});

const embeddedPostgresSupport = await getEmbeddedPostgresTestSupport();
const describeEmbeddedPostgres = embeddedPostgresSupport.supported ? describe : describe.skip;

if (!embeddedPostgresSupport.supported) {
  console.warn(
    `Skipping embedded Postgres heartbeat stale-queue invalidation tests on this host: ${embeddedPostgresSupport.reason ?? "unsupported environment"}`,
  );
}

async function ensureIssueRelationsTable(db: ReturnType<typeof createDb>) {
  await db.execute(sql.raw(`
    CREATE TABLE IF NOT EXISTS "issue_relations" (
      "id" uuid PRIMARY KEY DEFAULT gen_random_uuid(),
      "company_id" uuid NOT NULL,
      "issue_id" uuid NOT NULL,
      "related_issue_id" uuid NOT NULL,
      "type" text NOT NULL,
      "created_by_agent_id" uuid,
      "created_by_user_id" text,
      "created_at" timestamptz NOT NULL DEFAULT now(),
      "updated_at" timestamptz NOT NULL DEFAULT now()
    );
  `));
}

async function waitForCondition(fn: () => Promise<boolean>, timeoutMs = 3_000) {
  const deadline = Date.now() + timeoutMs;
  while (Date.now() < deadline) {
    if (await fn()) return true;
    await new Promise((resolve) => setTimeout(resolve, 50));
  }
  return fn();
}

type SeedOptions = {
  agentName?: string;
  agentRole?: string;
  maxConcurrentRuns?: number;
};

type SeedResult = {
  companyId: string;
  agentId: string;
};

describeEmbeddedPostgres("heartbeat stale queued-run invalidation", () => {
  let db!: ReturnType<typeof createDb>;
  let heartbeat!: ReturnType<typeof heartbeatService>;
  let tempDb: Awaited<ReturnType<typeof startEmbeddedPostgresTestDatabase>> | null = null;

  beforeAll(async () => {
    tempDb = await startEmbeddedPostgresTestDatabase("paperclip-heartbeat-stale-queue-");
    db = createDb(tempDb.connectionString);
    heartbeat = heartbeatService(db);
    await ensureIssueRelationsTable(db);
  }, 20_000);

  afterEach(async () => {
    mockAdapterExecute.mockReset();
    mockAdapterExecute.mockImplementation(async () => ({
      exitCode: 0,
      signal: null,
      timedOut: false,
      errorMessage: null,
      summary: "Stale-queue invalidation test run.",
      provider: "test",
      model: "test-model",
    }));
    runningProcesses.clear();
    let idlePolls = 0;
    for (let attempt = 0; attempt < 100; attempt += 1) {
      const runs = await db
        .select({ status: heartbeatRuns.status })
        .from(heartbeatRuns);
      const hasActiveRun = runs.some((run) => run.status === "queued" || run.status === "running");
      if (!hasActiveRun) {
        idlePolls += 1;
        if (idlePolls >= 3) break;
      } else {
        idlePolls = 0;
      }
      await new Promise((resolve) => setTimeout(resolve, 50));
    }
    await new Promise((resolve) => setTimeout(resolve, 50));
    await db.delete(companySkills);
    await db.delete(issueComments);
    await db.delete(issueDocuments);
    await db.delete(documentRevisions);
    await db.delete(documents);
    await db.delete(issueRelations);
    await db.delete(issueTreeHolds);
    await db.delete(issues);
    await db.delete(heartbeatRunEvents);
    await db.delete(activityLog);
    await db.delete(heartbeatRuns);
    await db.delete(agentWakeupRequests);
    await db.delete(agentRuntimeState);
    await db.delete(agents);
    await db.delete(companies);
  });

  afterAll(async () => {
    await tempDb?.cleanup();
  });

  async function seedCompanyAndAgent(opts: SeedOptions = {}): Promise<SeedResult> {
    const companyId = randomUUID();
    const agentId = randomUUID();
    await db.insert(companies).values({
      id: companyId,
      name: "Paperclip",
      issuePrefix: `T${companyId.replace(/-/g, "").slice(0, 6).toUpperCase()}`,
      requireBoardApprovalForNewAgents: false,
    });
    await db.insert(agents).values({
      id: agentId,
      companyId,
      name: opts.agentName ?? "ClaudeCoder",
      role: opts.agentRole ?? "engineer",
      status: "active",
      adapterType: "codex_local",
      adapterConfig: {},
      runtimeConfig: {
        heartbeat: {
          wakeOnDemand: true,
          maxConcurrentRuns: opts.maxConcurrentRuns ?? 1,
        },
      },
      permissions: {},
    });
    return { companyId, agentId };
  }

  async function seedQueuedRun(input: {
    companyId: string;
    agentId: string;
    issueId: string;
    wakeReason: string;
    contextExtras?: Record<string, unknown>;
    invocationSource?: "assignment" | "automation";
  }) {
    const wakeupRequestId = randomUUID();
    const runId = randomUUID();
    await db.insert(agentWakeupRequests).values({
      id: wakeupRequestId,
      companyId: input.companyId,
      agentId: input.agentId,
      source: input.invocationSource ?? "assignment",
      triggerDetail: "system",
      reason: input.wakeReason,
      payload: { issueId: input.issueId },
      status: "queued",
    });
    await db.insert(heartbeatRuns).values({
      id: runId,
      companyId: input.companyId,
      agentId: input.agentId,
      invocationSource: input.invocationSource ?? "assignment",
      triggerDetail: "system",
      status: "queued",
      wakeupRequestId,
      contextSnapshot: {
        issueId: input.issueId,
        wakeReason: input.wakeReason,
        ...(input.contextExtras ?? {}),
      },
    });
    await db
      .update(agentWakeupRequests)
      .set({ runId })
      .where(eq(agentWakeupRequests.id, wakeupRequestId));
    return { runId, wakeupRequestId };
  }

  it("cancels queued runs when the issue assignee changes before the run starts", async () => {
    const { companyId, agentId } = await seedCompanyAndAgent({ agentName: "OriginalCoder" });
    const replacementAgentId = randomUUID();
    await db.insert(agents).values({
      id: replacementAgentId,
      companyId,
      name: "ReplacementCoder",
      role: "engineer",
      status: "active",
      adapterType: "codex_local",
      adapterConfig: {},
      runtimeConfig: {
        heartbeat: {
          wakeOnDemand: true,
          maxConcurrentRuns: 1,
        },
      },
      permissions: {},
    });

    const issueId = randomUUID();
    await db.insert(issues).values({
      id: issueId,
      companyId,
      title: "Reassigned task",
      status: "in_progress",
      priority: "high",
      assigneeAgentId: replacementAgentId,
    });

    const { runId, wakeupRequestId } = await seedQueuedRun({
      companyId,
      agentId,
      issueId,
      wakeReason: "issue_assigned",
    });

    await heartbeat.resumeQueuedRuns();

    await waitForCondition(async () => {
      const run = await db
        .select({ status: heartbeatRuns.status })
        .from(heartbeatRuns)
        .where(eq(heartbeatRuns.id, runId))
        .then((rows) => rows[0] ?? null);
      return run?.status === "cancelled";
    });

    const [run, wakeup] = await Promise.all([
      db
        .select({
          status: heartbeatRuns.status,
          errorCode: heartbeatRuns.errorCode,
          resultJson: heartbeatRuns.resultJson,
        })
        .from(heartbeatRuns)
        .where(eq(heartbeatRuns.id, runId))
        .then((rows) => rows[0] ?? null),
      db
        .select({ status: agentWakeupRequests.status, error: agentWakeupRequests.error })
        .from(agentWakeupRequests)
        .where(eq(agentWakeupRequests.id, wakeupRequestId))
        .then((rows) => rows[0] ?? null),
    ]);

    expect(run?.status).toBe("cancelled");
    expect(run?.errorCode).toBe("issue_assignee_changed");
    expect(run?.resultJson).toMatchObject({ stopReason: "issue_assignee_changed" });
    expect(wakeup?.status).toBe("skipped");
    expect(wakeup?.error).toContain("assignee changed");
    expect(mockAdapterExecute).not.toHaveBeenCalled();
  });

  it("cancels queued runs when the issue reaches a terminal status before the run starts", async () => {
    const { companyId, agentId } = await seedCompanyAndAgent();
    const issueId = randomUUID();
    await db.insert(issues).values({
      id: issueId,
      companyId,
      title: "Already-completed task",
      status: "done",
      priority: "medium",
      assigneeAgentId: agentId,
    });

    const { runId, wakeupRequestId } = await seedQueuedRun({
      companyId,
      agentId,
      issueId,
      wakeReason: "issue_assigned",
    });

    await heartbeat.resumeQueuedRuns();

    await waitForCondition(async () => {
      const run = await db
        .select({ status: heartbeatRuns.status })
        .from(heartbeatRuns)
        .where(eq(heartbeatRuns.id, runId))
        .then((rows) => rows[0] ?? null);
      return run?.status === "cancelled";
    });

    const [run, wakeup] = await Promise.all([
      db
        .select({ status: heartbeatRuns.status, errorCode: heartbeatRuns.errorCode })
        .from(heartbeatRuns)
        .where(eq(heartbeatRuns.id, runId))
        .then((rows) => rows[0] ?? null),
      db
        .select({ status: agentWakeupRequests.status })
        .from(agentWakeupRequests)
        .where(eq(agentWakeupRequests.id, wakeupRequestId))
        .then((rows) => rows[0] ?? null),
    ]);

    expect(run?.status).toBe("cancelled");
    expect(run?.errorCode).toBe("issue_terminal_status");
    expect(wakeup?.status).toBe("skipped");
    expect(mockAdapterExecute).not.toHaveBeenCalled();
  });

  it("cancels queued in_review runs when the current participant changes before the run starts", async () => {
    const { companyId, agentId } = await seedCompanyAndAgent();
    const otherAgentId = randomUUID();
    await db.insert(agents).values({
      id: otherAgentId,
      companyId,
      name: "ReviewerAgent",
      role: "qa",
      status: "active",
      adapterType: "codex_local",
      adapterConfig: {},
      runtimeConfig: { heartbeat: { wakeOnDemand: true, maxConcurrentRuns: 1 } },
      permissions: {},
    });

    const issueId = randomUUID();
    await db.insert(issues).values({
      id: issueId,
      companyId,
      title: "In-review task now owned by reviewer",
      status: "in_review",
      priority: "medium",
      assigneeAgentId: agentId,
      executionState: {
        status: "pending",
        currentStageId: randomUUID(),
        currentStageIndex: 0,
        currentStageType: "review",
        currentParticipant: { type: "agent", agentId: otherAgentId, userId: null },
        returnAssignee: { type: "agent", agentId, userId: null },
        reviewRequest: null,
        completedStageIds: [],
        lastDecisionId: null,
        lastDecisionOutcome: null,
      },
    });

    const { runId, wakeupRequestId } = await seedQueuedRun({
      companyId,
      agentId,
      issueId,
      wakeReason: "issue_assigned",
    });

    await heartbeat.resumeQueuedRuns();

    await waitForCondition(async () => {
      const run = await db
        .select({ status: heartbeatRuns.status })
        .from(heartbeatRuns)
        .where(eq(heartbeatRuns.id, runId))
        .then((rows) => rows[0] ?? null);
      return run?.status === "cancelled";
    });

    const [run, wakeup] = await Promise.all([
      db
        .select({
          status: heartbeatRuns.status,
          errorCode: heartbeatRuns.errorCode,
          resultJson: heartbeatRuns.resultJson,
        })
        .from(heartbeatRuns)
        .where(eq(heartbeatRuns.id, runId))
        .then((rows) => rows[0] ?? null),
      db
        .select({ status: agentWakeupRequests.status, error: agentWakeupRequests.error })
        .from(agentWakeupRequests)
        .where(eq(agentWakeupRequests.id, wakeupRequestId))
        .then((rows) => rows[0] ?? null),
    ]);

    expect(run?.status).toBe("cancelled");
    expect(run?.errorCode).toBe("issue_review_participant_changed");
    expect(run?.resultJson).toMatchObject({ stopReason: "issue_review_participant_changed" });
    expect(wakeup?.status).toBe("skipped");
    expect(wakeup?.error).toContain("in-review participant changed");
    expect(mockAdapterExecute).not.toHaveBeenCalled();
  });

  it("still runs comment-driven wakes on in_review issues even when the agent is no longer the current participant", async () => {
    const { companyId, agentId } = await seedCompanyAndAgent();
    const otherAgentId = randomUUID();
    await db.insert(agents).values({
      id: otherAgentId,
      companyId,
      name: "ReviewerAgent",
      role: "qa",
      status: "active",
      adapterType: "codex_local",
      adapterConfig: {},
      runtimeConfig: { heartbeat: { wakeOnDemand: true, maxConcurrentRuns: 1 } },
      permissions: {},
    });

    const issueId = randomUUID();
    const commentId = randomUUID();
    await db.insert(issues).values({
      id: issueId,
      companyId,
      title: "In-review task with comment feedback",
      status: "in_review",
      priority: "medium",
      assigneeAgentId: agentId,
      executionState: {
        status: "pending",
        currentStageId: randomUUID(),
        currentStageIndex: 0,
        currentStageType: "review",
        currentParticipant: { type: "agent", agentId: otherAgentId, userId: null },
        returnAssignee: { type: "agent", agentId, userId: null },
        reviewRequest: null,
        completedStageIds: [],
        lastDecisionId: null,
        lastDecisionOutcome: null,
      },
    });
    await db.insert(issueComments).values({
      id: commentId,
      companyId,
      issueId,
      authorAgentId: otherAgentId,
      body: "Review feedback comment",
    });

    const { runId } = await seedQueuedRun({
      companyId,
      agentId,
      issueId,
      wakeReason: "issue_commented",
      invocationSource: "automation",
      contextExtras: {
        commentId,
        wakeCommentId: commentId,
        source: "issue.comment",
      },
    });

    await heartbeat.resumeQueuedRuns();

    await waitForCondition(async () => {
      const run = await db
        .select({ status: heartbeatRuns.status })
        .from(heartbeatRuns)
        .where(eq(heartbeatRuns.id, runId))
        .then((rows) => rows[0] ?? null);
      return run?.status === "succeeded";
    });

    const run = await db
      .select({ status: heartbeatRuns.status, errorCode: heartbeatRuns.errorCode })
      .from(heartbeatRuns)
      .where(eq(heartbeatRuns.id, runId))
      .then((rows) => rows[0] ?? null);
    expect(run?.status).toBe("succeeded");
    expect(run?.errorCode).toBeNull();
  });

  it("baseline: runs queued runs when the issue is in_progress with the same assignee", async () => {
    const { companyId, agentId } = await seedCompanyAndAgent();
    const issueId = randomUUID();
    await db.insert(issues).values({
      id: issueId,
      companyId,
      title: "Still actionable",
      status: "in_progress",
      priority: "medium",
      assigneeAgentId: agentId,
    });

    const { runId } = await seedQueuedRun({
      companyId,
      agentId,
      issueId,
      wakeReason: "issue_assigned",
    });

    await heartbeat.resumeQueuedRuns();

    await waitForCondition(async () => {
      const run = await db
        .select({ status: heartbeatRuns.status })
        .from(heartbeatRuns)
        .where(eq(heartbeatRuns.id, runId))
        .then((rows) => rows[0] ?? null);
      return run?.status === "succeeded";
    });

    const run = await db
      .select({ status: heartbeatRuns.status, errorCode: heartbeatRuns.errorCode })
      .from(heartbeatRuns)
      .where(eq(heartbeatRuns.id, runId))
      .then((rows) => rows[0] ?? null);
    expect(run?.status).toBe("succeeded");
    expect(run?.errorCode).toBeNull();
    expect(mockAdapterExecute).toHaveBeenCalledTimes(1);
  });
});