import { randomUUID } from "node:crypto";
import fs from "node:fs";
import net from "node:net";
import os from "node:os";
import path from "node:path";
import { createServer } from "node:http";
import { and, asc, eq } from "drizzle-orm";
import { WebSocketServer } from "ws";
import { afterAll, beforeAll, describe, expect, it } from "vitest";
import {
  agents,
  agentWakeupRequests,
  applyPendingMigrations,
  companies,
  createDb,
  ensurePostgresDatabase,
  heartbeatRuns,
  issueComments,
  issues,
} from "@paperclipai/db";
import { heartbeatService } from "../services/heartbeat.ts";

type EmbeddedPostgresInstance = {
  initialise(): Promise<void>;
  start(): Promise<void>;
  stop(): Promise<void>;
};

type EmbeddedPostgresCtor = new (opts: {
  databaseDir: string;
  user: string;
  password: string;
  port: number;
  persistent: boolean;
  initdbFlags?: string[];
  onLog?: (message: unknown) => void;
  onError?: (message: unknown) => void;
}) => EmbeddedPostgresInstance;

async function getEmbeddedPostgresCtor(): Promise<EmbeddedPostgresCtor> {
  const mod = await import("embedded-postgres");
  return mod.default as EmbeddedPostgresCtor;
}

async function getAvailablePort(): Promise<number> {
  return await new Promise((resolve, reject) => {
    const server = net.createServer();
    server.unref();
    server.on("error", reject);
    server.listen(0, "127.0.0.1", () => {
      const address = server.address();
      if (!address || typeof address === "string") {
        server.close(() => reject(new Error("Failed to allocate test port")));
        return;
      }
      const { port } = address;
      server.close((error) => {
        if (error) reject(error);
        else resolve(port);
      });
    });
  });
}

async function startTempDatabase() {
  const dataDir = fs.mkdtempSync(path.join(os.tmpdir(), "paperclip-heartbeat-comment-wake-"));
  const port = await getAvailablePort();
  const EmbeddedPostgres = await getEmbeddedPostgresCtor();
  const instance = new EmbeddedPostgres({
    databaseDir: dataDir,
    user: "paperclip",
    password: "paperclip",
    port,
    persistent: true,
    initdbFlags: ["--encoding=UTF8", "--locale=C", "--lc-messages=C"],
    onLog: () => {},
    onError: () => {},
  });
  await instance.initialise();
  await instance.start();

  const adminConnectionString = `postgres://paperclip:paperclip@127.0.0.1:${port}/postgres`;
  await ensurePostgresDatabase(adminConnectionString, "paperclip");
  const connectionString = `postgres://paperclip:paperclip@127.0.0.1:${port}/paperclip`;
  await applyPendingMigrations(connectionString);
  return { connectionString, instance, dataDir };
}

async function waitFor(condition: () => boolean | Promise<boolean>, timeoutMs = 10_000, intervalMs = 50) {
  const startedAt = Date.now();
  while (Date.now() - startedAt < timeoutMs) {
    if (await condition()) return;
    await new Promise((resolve) => setTimeout(resolve, intervalMs));
  }
  throw new Error("Timed out waiting for condition");
}

async function createControlledGatewayServer() {
  const server = createServer();
  const wss = new WebSocketServer({ server });
  const agentPayloads: Array<Record<string, unknown>> = [];
  let firstWaitRelease: (() => void) | null = null;
  let firstWaitGate = new Promise<void>((resolve) => {
    firstWaitRelease = resolve;
  });
  let waitCount = 0;

  wss.on("connection", (socket) => {
    socket.send(
      JSON.stringify({
        type: "event",
        event: "connect.challenge",
        payload: { nonce: "nonce-123" },
      }),
    );

    socket.on("message", async (raw) => {
      const text = Buffer.isBuffer(raw) ? raw.toString("utf8") : String(raw);
      const frame = JSON.parse(text) as {
        type: string;
        id: string;
        method: string;
        params?: Record<string, unknown>;
      };

      if (frame.type !== "req") return;

      if (frame.method === "connect") {
        socket.send(
          JSON.stringify({
            type: "res",
            id: frame.id,
            ok: true,
            payload: {
              type: "hello-ok",
              protocol: 3,
              server: { version: "test", connId: "conn-1" },
              features: { methods: ["connect", "agent", "agent.wait"], events: ["agent"] },
              snapshot: { version: 1, ts: Date.now() },
              policy: { maxPayload: 1_000_000, maxBufferedBytes: 1_000_000, tickIntervalMs: 30_000 },
            },
          }),
        );
        return;
      }

      if (frame.method === "agent") {
        agentPayloads.push((frame.params ?? {}) as Record<string, unknown>);
        const runId =
          typeof frame.params?.idempotencyKey === "string"
            ? frame.params.idempotencyKey
            : `run-${agentPayloads.length}`;

        socket.send(
          JSON.stringify({
            type: "res",
            id: frame.id,
            ok: true,
            payload: {
              runId,
              status: "accepted",
              acceptedAt: Date.now(),
            },
          }),
        );
        return;
      }

      if (frame.method === "agent.wait") {
        waitCount += 1;
        if (waitCount === 1) {
          await firstWaitGate;
        }
        socket.send(
          JSON.stringify({
            type: "res",
            id: frame.id,
            ok: true,
            payload: {
              runId: frame.params?.runId,
              status: "ok",
              startedAt: 1,
              endedAt: 2,
            },
          }),
        );
      }
    });
  });

  await new Promise<void>((resolve) => {
    server.listen(0, "127.0.0.1", () => resolve());
  });

  const address = server.address();
  if (!address || typeof address === "string") {
    throw new Error("Failed to resolve test server address");
  }

  return {
    url: `ws://127.0.0.1:${address.port}`,
    getAgentPayloads: () => agentPayloads,
    releaseFirstWait: () => {
      firstWaitRelease?.();
      firstWaitRelease = null;
      firstWaitGate = Promise.resolve();
    },
    close: async () => {
      await new Promise<void>((resolve) => wss.close(() => resolve()));
      await new Promise<void>((resolve) => server.close(() => resolve()));
    },
  };
}

describe("heartbeat comment wake batching", () => {
  let db!: ReturnType<typeof createDb>;
  let instance: EmbeddedPostgresInstance | null = null;
  let dataDir = "";

  beforeAll(async () => {
    const started = await startTempDatabase();
    db = createDb(started.connectionString);
    instance = started.instance;
    dataDir = started.dataDir;
  }, 45_000);

  afterAll(async () => {
    await instance?.stop();
    if (dataDir) {
      fs.rmSync(dataDir, { recursive: true, force: true });
    }
  });

  it("batches deferred comment wakes and forwards the ordered batch to the next run", async () => {
    const gateway = await createControlledGatewayServer();
    const companyId = randomUUID();
    const agentId = randomUUID();
    const issueId = randomUUID();
    const issuePrefix = `T${companyId.replace(/-/g, "").slice(0, 6).toUpperCase()}`;
    const heartbeat = heartbeatService(db);

    try {
      await db.insert(companies).values({
        id: companyId,
        name: "Paperclip",
        issuePrefix,
        requireBoardApprovalForNewAgents: false,
      });

      await db.insert(agents).values({
        id: agentId,
        companyId,
        name: "Gateway Agent",
        role: "engineer",
        status: "idle",
        adapterType: "openclaw_gateway",
        adapterConfig: {
          url: gateway.url,
          headers: {
            "x-openclaw-token": "gateway-token",
          },
          payloadTemplate: {
            message: "wake now",
          },
          waitTimeoutMs: 2_000,
        },
        runtimeConfig: {},
        permissions: {},
      });

      await db.insert(issues).values({
        id: issueId,
        companyId,
        title: "Batch wake comments",
        status: "todo",
        priority: "medium",
        assigneeAgentId: agentId,
        issueNumber: 1,
        identifier: `${issuePrefix}-1`,
      });

      const comment1 = await db
        .insert(issueComments)
        .values({
          companyId,
          issueId,
          authorUserId: "user-1",
          body: "First comment",
        })
        .returning()
        .then((rows) => rows[0]);
      const firstRun = await heartbeat.wakeup(agentId, {
        source: "automation",
        triggerDetail: "system",
        reason: "issue_commented",
        payload: { issueId, commentId: comment1.id },
        contextSnapshot: {
          issueId,
          taskId: issueId,
          commentId: comment1.id,
          wakeReason: "issue_commented",
        },
        requestedByActorType: "user",
        requestedByActorId: "user-1",
      });

      expect(firstRun).not.toBeNull();
      await waitFor(() => gateway.getAgentPayloads().length === 1);

      await db.insert(issueComments).values({
        companyId,
        issueId,
        authorAgentId: agentId,
        createdByRunId: firstRun?.id ?? null,
        body: "Heartbeat acknowledged",
      });

      const comment2 = await db
        .insert(issueComments)
        .values({
          companyId,
          issueId,
          authorUserId: "user-1",
          body: "Second comment",
        })
        .returning()
        .then((rows) => rows[0]);
      const comment3 = await db
        .insert(issueComments)
        .values({
          companyId,
          issueId,
          authorUserId: "user-1",
          body: "Third comment",
        })
        .returning()
        .then((rows) => rows[0]);

      const secondRun = await heartbeat.wakeup(agentId, {
        source: "automation",
        triggerDetail: "system",
        reason: "issue_commented",
        payload: { issueId, commentId: comment2.id },
        contextSnapshot: {
          issueId,
          taskId: issueId,
          commentId: comment2.id,
          wakeReason: "issue_commented",
        },
        requestedByActorType: "user",
        requestedByActorId: "user-1",
      });
      const thirdRun = await heartbeat.wakeup(agentId, {
        source: "automation",
        triggerDetail: "system",
        reason: "issue_commented",
        payload: { issueId, commentId: comment3.id },
        contextSnapshot: {
          issueId,
          taskId: issueId,
          commentId: comment3.id,
          wakeReason: "issue_commented",
        },
        requestedByActorType: "user",
        requestedByActorId: "user-1",
      });

      expect(secondRun).toBeNull();
      expect(thirdRun).toBeNull();

      await waitFor(async () => {
        const deferred = await db
          .select()
          .from(agentWakeupRequests)
          .where(
            and(
              eq(agentWakeupRequests.companyId, companyId),
              eq(agentWakeupRequests.agentId, agentId),
              eq(agentWakeupRequests.status, "deferred_issue_execution"),
            ),
          )
          .then((rows) => rows[0] ?? null);
        return Boolean(deferred);
      });

      const deferredWake = await db
          .select()
          .from(agentWakeupRequests)
          .where(
            and(
              eq(agentWakeupRequests.companyId, companyId),
              eq(agentWakeupRequests.agentId, agentId),
              eq(agentWakeupRequests.status, "deferred_issue_execution"),
            ),
          )
          .then((rows) => rows[0] ?? null);

      const deferredContext = (deferredWake?.payload as Record<string, unknown> | null)?._paperclipWakeContext as
        | Record<string, unknown>
        | undefined;
      expect(deferredContext?.wakeCommentIds).toEqual([comment2.id, comment3.id]);

      gateway.releaseFirstWait();

      await waitFor(() => gateway.getAgentPayloads().length === 2);
      await waitFor(async () => {
        const runs = await db.select().from(heartbeatRuns).where(eq(heartbeatRuns.agentId, agentId));
        return runs.length === 2 && runs.every((run) => run.status === "succeeded");
      }, 30_000);

      const secondPayload = gateway.getAgentPayloads()[1] ?? {};
      expect(secondPayload.paperclip).toMatchObject({
        wake: {
          commentIds: [comment2.id, comment3.id],
          latestCommentId: comment3.id,
        },
      });
      expect(String(secondPayload.message ?? "")).toContain("Second comment");
      expect(String(secondPayload.message ?? "")).toContain("Third comment");
      expect(String(secondPayload.message ?? "")).not.toContain("First comment");
    } finally {
      gateway.releaseFirstWait();
      await gateway.close();
    }
  }, 45_000);

  it("queues exactly one follow-up run when an issue-bound run exits without a comment", async () => {
    const gateway = await createControlledGatewayServer();
    const companyId = randomUUID();
    const agentId = randomUUID();
    const issueId = randomUUID();
    const issuePrefix = `T${companyId.replace(/-/g, "").slice(0, 6).toUpperCase()}`;
    const heartbeat = heartbeatService(db);

    try {
      await db.insert(companies).values({
        id: companyId,
        name: "Paperclip",
        issuePrefix,
        requireBoardApprovalForNewAgents: false,
      });

      await db.insert(agents).values({
        id: agentId,
        companyId,
        name: "Gateway Agent",
        role: "engineer",
        status: "idle",
        adapterType: "openclaw_gateway",
        adapterConfig: {
          url: gateway.url,
          headers: {
            "x-openclaw-token": "gateway-token",
          },
          payloadTemplate: {
            message: "wake now",
          },
          waitTimeoutMs: 2_000,
        },
        runtimeConfig: {},
        permissions: {},
      });

      await db.insert(issues).values({
        id: issueId,
        companyId,
        title: "Require a comment",
        status: "todo",
        priority: "medium",
        assigneeAgentId: agentId,
        issueNumber: 1,
        identifier: `${issuePrefix}-1`,
      });

      const firstRun = await heartbeat.wakeup(agentId, {
        source: "assignment",
        triggerDetail: "system",
        reason: "issue_assigned",
        payload: { issueId },
        contextSnapshot: {
          issueId,
          taskId: issueId,
          wakeReason: "issue_assigned",
        },
        requestedByActorType: "system",
        requestedByActorId: null,
      });

      expect(firstRun).not.toBeNull();
      await waitFor(() => gateway.getAgentPayloads().length === 1);
      gateway.releaseFirstWait();
      await waitFor(async () => {
        const runs = await db
          .select()
          .from(heartbeatRuns)
          .where(eq(heartbeatRuns.agentId, agentId))
          .orderBy(asc(heartbeatRuns.createdAt));
        return (
          runs.length === 2 &&
          runs.every((run) => run.status === "succeeded") &&
          runs[0]?.issueCommentStatus === "retry_queued" &&
          runs[1]?.issueCommentStatus === "retry_exhausted"
        );
      });

      const runs = await db
        .select()
        .from(heartbeatRuns)
        .where(eq(heartbeatRuns.agentId, agentId))
        .orderBy(asc(heartbeatRuns.createdAt));

      expect(runs).toHaveLength(2);
      expect(runs[0]?.issueCommentStatus).toBe("retry_queued");
      expect(runs[1]?.retryOfRunId).toBe(runs[0]?.id);
      expect(runs[1]?.issueCommentStatus).toBe("retry_exhausted");

      const comments = await db
        .select()
        .from(issueComments)
        .where(eq(issueComments.issueId, issueId));
      expect(comments).toHaveLength(0);

      await waitFor(async () => {
        const wakeups = await db
          .select()
          .from(agentWakeupRequests)
          .where(and(eq(agentWakeupRequests.companyId, companyId), eq(agentWakeupRequests.agentId, agentId)));
        return wakeups.length >= 2;
      });

      const payloads = gateway.getAgentPayloads();
      expect(payloads).toHaveLength(2);
      expect(runs[1]?.contextSnapshot).toMatchObject({
        retryReason: "missing_issue_comment",
      });
    } finally {
      gateway.releaseFirstWait();
      await gateway.close();
    }
  }, 20_000);
});