import fs from "node:fs";
import os from "node:os";
import path from "node:path";
import { createInterface } from "node:readline";
import { PassThrough } from "node:stream";
import { pathToFileURL } from "node:url";

import { afterEach, describe, expect, it } from "vitest";

import { definePlugin } from "../src/define-plugin.js";
import {
  createRequest,
  createErrorResponse,
  createSuccessResponse,
  isJsonRpcRequest,
  isJsonRpcResponse,
  parseMessage,
  PLUGIN_RPC_ERROR_CODES,
  serializeMessage,
  type JsonRpcResponse,
  type PluginInvocationContext,
} from "../src/protocol.js";
import { isWorkerEntrypoint, startWorkerRpcHost } from "../src/worker-rpc-host.js";

describe("isWorkerEntrypoint", () => {
  const tempRoots: string[] = [];

  afterEach(() => {
    for (const tempRoot of tempRoots.splice(0)) {
      fs.rmSync(tempRoot, { recursive: true, force: true });
    }
  });

  function createTempRoot(): string {
    const tempRoot = fs.mkdtempSync(path.join(os.tmpdir(), "paperclip-sdk-worker-"));
    tempRoots.push(tempRoot);
    return tempRoot;
  }

  it("matches an entrypoint reached through a symlinked directory", () => {
    const tempRoot = createTempRoot();
    const realDir = path.join(tempRoot, "real");
    const linkDir = path.join(tempRoot, "link");
    fs.mkdirSync(realDir);
    fs.symlinkSync(realDir, linkDir, "dir");

    const workerPath = path.join(realDir, "worker.js");
    fs.writeFileSync(workerPath, "");

    expect(
      isWorkerEntrypoint(
        path.join(linkDir, "worker.js"),
        pathToFileURL(workerPath).toString(),
      ),
    ).toBe(true);
  });

  it("does not match a different entrypoint", () => {
    const tempRoot = createTempRoot();
    const workerPath = path.join(tempRoot, "worker.js");
    const otherPath = path.join(tempRoot, "other.js");
    fs.writeFileSync(workerPath, "");
    fs.writeFileSync(otherPath, "");

    expect(
      isWorkerEntrypoint(
        otherPath,
        pathToFileURL(workerPath).toString(),
      ),
    ).toBe(false);
  });
});

describe("worker performAction context", () => {
  it("does not derive context companyId from caller params without host actor context", async () => {
    const hostToWorker = new PassThrough();
    const workerToHost = new PassThrough();
    const hostReadline = createInterface({ input: workerToHost });
    const pending = new Map<string, (response: JsonRpcResponse) => void>();
    let nextRequestId = 1;
    const plugin = definePlugin({
      async setup(ctx) {
        ctx.actions.register("inspect", async (params, context) => ({
          paramsCompanyId: params.companyId,
          actor: context.actor,
          companyId: context.companyId,
        }));
      },
    });
    const worker = startWorkerRpcHost({
      plugin,
      stdin: hostToWorker,
      stdout: workerToHost,
    });

    function callWorker(method: string, params: unknown) {
      const id = `host-${nextRequestId++}`;
      const result = new Promise<unknown>((resolve, reject) => {
        pending.set(id, (response) => {
          if ("error" in response && response.error) {
            reject(new Error(response.error.message));
            return;
          }
          resolve((response as { result?: unknown }).result);
        });
      });
      hostToWorker.write(serializeMessage(createRequest(method, params, id)));
      return result;
    }

    hostReadline.on("line", (line) => {
      const message = parseMessage(line);
      if (!isJsonRpcResponse(message)) return;
      pending.get(String(message.id))?.(message);
      pending.delete(String(message.id));
    });

    try {
      await expect(callWorker("initialize", {
        manifest: {
          id: "paperclip.test-worker-context",
          apiVersion: 1,
          version: "1.0.0",
          displayName: "Worker Context Test",
          description: "Test plugin",
          author: "Paperclip",
          categories: ["automation"],
          capabilities: [],
          entrypoints: {},
        },
        config: {},
        databaseNamespace: null,
      })).resolves.toMatchObject({ ok: true });

      await expect(callWorker("performAction", {
        key: "inspect",
        params: { companyId: "spoofed-company" },
      })).resolves.toEqual({
        paramsCompanyId: "spoofed-company",
        actor: {
          type: "system",
          userId: null,
          agentId: null,
          runId: null,
          companyId: null,
        },
        companyId: null,
      });
    } finally {
      worker.stop();
      hostReadline.close();
      hostToWorker.destroy();
      workerToHost.destroy();
    }
  });
});

describe("worker invocation scope propagation", () => {
  it("keeps overlapping company scopes local to each getData invocation", async () => {
    const hostToWorker = new PassThrough();
    const workerToHost = new PassThrough();
    const hostReadline = createInterface({ input: workerToHost });
    const pending = new Map<string, (response: JsonRpcResponse) => void>();
    const nestedInvocationIds: string[] = [];
    const invocationCompanies = new Map([
      ["invocation-a", "company-a"],
      ["invocation-b", "company-b"],
    ]);
    let releaseCompanyA: (() => void) | null = null;
    let nextRequestId = 1;

    const plugin = definePlugin({
      async setup(ctx) {
        ctx.data.register("probe", async (params) => {
          if (params.label === "a") {
            await new Promise<void>((resolve) => {
              releaseCompanyA = resolve;
            });
          }
          const company = await ctx.companies.get(String(params.requestedCompanyId));
          return { label: params.label, company };
        });
      },
    });

    const worker = startWorkerRpcHost({
      plugin,
      stdin: hostToWorker,
      stdout: workerToHost,
    });

    function callWorker(method: string, params: unknown, invocation?: PluginInvocationContext) {
      const id = `host-${nextRequestId++}`;
      const request = {
        ...createRequest(method, params, id),
        ...(invocation ? { paperclipInvocation: invocation } : {}),
      };
      const result = new Promise<unknown>((resolve, reject) => {
        pending.set(id, (response) => {
          if ("error" in response && response.error) {
            reject(new Error(response.error.message));
            return;
          }
          resolve((response as { result?: unknown }).result);
        });
      });
      hostToWorker.write(serializeMessage(request));
      return result;
    }

    hostReadline.on("line", (line) => {
      const message = parseMessage(line);
      if (isJsonRpcResponse(message)) {
        pending.get(String(message.id))?.(message);
        pending.delete(String(message.id));
        return;
      }

      if (!isJsonRpcRequest(message)) return;
      if (message.method !== "companies.get") return;

      const invocationId = (message as { paperclipInvocationId?: string }).paperclipInvocationId ?? "";
      const requestedCompanyId = (message.params as { companyId?: string }).companyId;
      const allowedCompanyId = invocationCompanies.get(invocationId);
      nestedInvocationIds.push(invocationId);
      if (requestedCompanyId !== allowedCompanyId) {
        hostToWorker.write(serializeMessage(createErrorResponse(
          message.id,
          PLUGIN_RPC_ERROR_CODES.CAPABILITY_DENIED,
          `requested company "${requestedCompanyId}" but invocation "${invocationId}" is scoped to "${allowedCompanyId}"`,
        )));
        return;
      }

      hostToWorker.write(serializeMessage(createSuccessResponse(message.id, {
        id: requestedCompanyId,
      })));

      if (invocationId === "invocation-b") {
        releaseCompanyA?.();
      }
    });

    try {
      await callWorker("initialize", {
        manifest: {
          id: "paperclip.scope-test",
          apiVersion: 1,
          version: "1.0.0",
          displayName: "Scope test",
          description: "Scope test",
          author: "Paperclip",
          categories: ["automation"],
          capabilities: ["companies.read"],
          entrypoints: { worker: "dist/worker.js" },
        },
        config: {},
        instanceInfo: { instanceId: "test", hostVersion: "0.0.0" },
        apiVersion: 1,
      });

      const companyARequest = callWorker(
        "getData",
        {
          key: "probe",
          companyId: "company-a",
          params: { label: "a", requestedCompanyId: "company-b" },
        },
        { id: "invocation-a", scope: { companyId: "company-a" } },
      );
      const companyAExpectation = expect(companyARequest).rejects.toThrow(
        /requested company "company-b"/,
      );
      const companyBRequest = callWorker(
        "getData",
        {
          key: "probe",
          companyId: "company-b",
          params: { label: "b", requestedCompanyId: "company-b" },
        },
        { id: "invocation-b", scope: { companyId: "company-b" } },
      );

      await expect(companyBRequest).resolves.toEqual({
        label: "b",
        company: { id: "company-b" },
      });
      await companyAExpectation;

      expect(nestedInvocationIds).toEqual(["invocation-b", "invocation-a"]);
    } finally {
      worker.stop();
      hostReadline.close();
      hostToWorker.destroy();
      workerToHost.destroy();
    }
  });
});

describe("worker configChanged cross-tenant guard", () => {
  // Spin up a worker-rpc-host wired to in-memory streams and expose a
  // request/response `callWorker` plus `initialize`/`stop` helpers.
  function makeWorker(plugin: ReturnType<typeof definePlugin>) {
    const hostToWorker = new PassThrough();
    const workerToHost = new PassThrough();
    const hostReadline = createInterface({ input: workerToHost });
    const pending = new Map<string, (response: JsonRpcResponse) => void>();
    let nextRequestId = 1;

    const worker = startWorkerRpcHost({
      plugin,
      stdin: hostToWorker,
      stdout: workerToHost,
    });

    function callWorker(method: string, params: unknown) {
      const id = `host-${nextRequestId++}`;
      const result = new Promise<unknown>((resolve, reject) => {
        pending.set(id, (response) => {
          if ("error" in response && response.error) {
            reject(
              Object.assign(new Error(response.error.message), {
                code: response.error.code,
              }),
            );
            return;
          }
          resolve((response as { result?: unknown }).result);
        });
      });
      hostToWorker.write(serializeMessage(createRequest(method, params, id)));
      return result;
    }

    hostReadline.on("line", (line) => {
      const message = parseMessage(line);
      if (!isJsonRpcResponse(message)) return;
      pending.get(String(message.id))?.(message);
      pending.delete(String(message.id));
    });

    async function initialize() {
      await callWorker("initialize", {
        manifest: {
          id: "paperclip.config-guard-test",
          apiVersion: 1,
          version: "1.0.0",
          displayName: "Config Guard Test",
          description: "Test plugin",
          author: "Paperclip",
          categories: ["automation"],
          capabilities: [],
          entrypoints: {},
        },
        config: {},
        databaseNamespace: null,
      });
    }

    function stop() {
      worker.stop();
      hostReadline.close();
      hostToWorker.destroy();
      workerToHost.destroy();
    }

    return { callWorker, initialize, stop };
  }

  it("fails closed when a second, distinct company's config would overwrite a single-tenant worker", async () => {
    const applied: Array<{ companyId: string | null; token: unknown }> = [];
    const plugin = definePlugin({
      async setup() {},
      async onConfigChanged(newConfig, context) {
        applied.push({
          companyId: context?.companyId ?? null,
          token: newConfig.slackBotToken,
        });
      },
    });
    const { callWorker, initialize, stop } = makeWorker(plugin);

    try {
      await initialize();

      // Company A's config is delivered first (deterministic ORDER BY companyId
      // in the loader) and applied.
      await expect(
        callWorker("configChanged", {
          config: { companyId: "company-a", slackBotToken: "xoxb-A" },
          companyId: "company-a",
        }),
      ).resolves.toBeNull();

      // Company B's *distinct* config must be rejected rather than silently
      // collapsing the single worker onto B's bot token (the vulnerability).
      await expect(
        callWorker("configChanged", {
          config: { companyId: "company-b", slackBotToken: "xoxb-B" },
          companyId: "company-b",
        }),
      ).rejects.toMatchObject({
        code: PLUGIN_RPC_ERROR_CODES.CROSS_TENANT_CONFIG,
      });

      // The worker stayed bound to company A; company B never reached the
      // plugin. Against the pre-fix code this array would be
      // [company-a, company-b] (last-write-wins collapse).
      expect(applied).toEqual([{ companyId: "company-a", token: "xoxb-A" }]);
    } finally {
      stop();
    }
  });

  it("allows an idempotent replay of the same config under a different scope row", async () => {
    // Mirrors the live single-tenant gateway: several plugin_config rows keyed
    // by distinct row companyIds but all embedding the same config. Replaying
    // them must be a no-op, not a fail-closed rejection.
    const appliedScopes: Array<string | null> = [];
    const plugin = definePlugin({
      async setup() {},
      async onConfigChanged(_newConfig, context) {
        appliedScopes.push(context?.companyId ?? null);
      },
    });
    const { callWorker, initialize, stop } = makeWorker(plugin);

    try {
      await initialize();
      const embedded = { companyId: "company-a", slackBotToken: "xoxb-A" };

      await callWorker("configChanged", {
        config: { ...embedded },
        companyId: "row-scope-1",
      });
      await expect(
        callWorker("configChanged", {
          config: { ...embedded },
          companyId: "row-scope-2",
        }),
      ).resolves.toBeNull();

      expect(appliedScopes).toEqual(["row-scope-1", "row-scope-2"]);
    } finally {
      stop();
    }
  });

  it("threads per-company config to a plugin that opts into multiCompanyConfig", async () => {
    const applied: Array<{ companyId: string | null; token: unknown }> = [];
    const plugin = definePlugin({
      multiCompanyConfig: true,
      async setup() {},
      async onConfigChanged(newConfig, context) {
        applied.push({
          companyId: context?.companyId ?? null,
          token: newConfig.slackBotToken,
        });
      },
    });
    const { callWorker, initialize, stop } = makeWorker(plugin);

    try {
      await initialize();

      await callWorker("configChanged", {
        config: { companyId: "company-a", slackBotToken: "xoxb-A" },
        companyId: "company-a",
      });
      await expect(
        callWorker("configChanged", {
          config: { companyId: "company-b", slackBotToken: "xoxb-B" },
          companyId: "company-b",
        }),
      ).resolves.toBeNull();

      // Both companies' configs delivered, each tagged with its own scope.
      expect(applied).toEqual([
        { companyId: "company-a", token: "xoxb-A" },
        { companyId: "company-b", token: "xoxb-B" },
      ]);
    } finally {
      stop();
    }
  });
});