import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
import register from "./index.js";

describe("thread-ownership plugin", () => {
  const hooks: Record<string, Function> = {};
  const api = {
    pluginConfig: {},
    config: {
      agents: {
        list: [{ id: "test-agent", default: true, identity: { name: "TestBot" } }],
      },
    },
    id: "thread-ownership",
    name: "Thread Ownership",
    logger: { info: vi.fn(), warn: vi.fn(), debug: vi.fn() },
    on: vi.fn((hookName: string, handler: Function) => {
      hooks[hookName] = handler;
    }),
  };

  let originalFetch: typeof globalThis.fetch;

  beforeEach(() => {
    vi.clearAllMocks();
    for (const key of Object.keys(hooks)) delete hooks[key];

    process.env.SLACK_FORWARDER_URL = "http://localhost:8750";
    process.env.SLACK_BOT_USER_ID = "U999";

    originalFetch = globalThis.fetch;
    globalThis.fetch = vi.fn();
  });

  afterEach(() => {
    globalThis.fetch = originalFetch;
    delete process.env.SLACK_FORWARDER_URL;
    delete process.env.SLACK_BOT_USER_ID;
    vi.restoreAllMocks();
  });

  it("registers message_received and message_sending hooks", () => {
    register(api as any);

    expect(api.on).toHaveBeenCalledTimes(2);
    expect(api.on).toHaveBeenCalledWith("message_received", expect.any(Function));
    expect(api.on).toHaveBeenCalledWith("message_sending", expect.any(Function));
  });

  describe("message_sending", () => {
    beforeEach(() => {
      register(api as any);
    });

    it("allows non-slack channels", async () => {
      const result = await hooks.message_sending(
        { content: "hello", metadata: { threadTs: "1234.5678", channelId: "C123" }, to: "C123" },
        { channelId: "discord", conversationId: "C123" },
      );

      expect(result).toBeUndefined();
      expect(globalThis.fetch).not.toHaveBeenCalled();
    });

    it("allows top-level messages (no threadTs)", async () => {
      const result = await hooks.message_sending(
        { content: "hello", metadata: {}, to: "C123" },
        { channelId: "slack", conversationId: "C123" },
      );

      expect(result).toBeUndefined();
      expect(globalThis.fetch).not.toHaveBeenCalled();
    });

    it("claims ownership successfully", async () => {
      vi.mocked(globalThis.fetch).mockResolvedValue(
        new Response(JSON.stringify({ owner: "test-agent" }), { status: 200 }),
      );

      const result = await hooks.message_sending(
        { content: "hello", metadata: { threadTs: "1234.5678", channelId: "C123" }, to: "C123" },
        { channelId: "slack", conversationId: "C123" },
      );

      expect(result).toBeUndefined();
      expect(globalThis.fetch).toHaveBeenCalledWith(
        "http://localhost:8750/api/v1/ownership/C123/1234.5678",
        expect.objectContaining({
          method: "POST",
          body: JSON.stringify({ agent_id: "test-agent" }),
        }),
      );
    });

    it("cancels when thread owned by another agent", async () => {
      vi.mocked(globalThis.fetch).mockResolvedValue(
        new Response(JSON.stringify({ owner: "other-agent" }), { status: 409 }),
      );

      const result = await hooks.message_sending(
        { content: "hello", metadata: { threadTs: "1234.5678", channelId: "C123" }, to: "C123" },
        { channelId: "slack", conversationId: "C123" },
      );

      expect(result).toEqual({ cancel: true });
      expect(api.logger.info).toHaveBeenCalledWith(expect.stringContaining("cancelled send"));
    });

    it("fails open on network error", async () => {
      vi.mocked(globalThis.fetch).mockRejectedValue(new Error("ECONNREFUSED"));

      const result = await hooks.message_sending(
        { content: "hello", metadata: { threadTs: "1234.5678", channelId: "C123" }, to: "C123" },
        { channelId: "slack", conversationId: "C123" },
      );

      expect(result).toBeUndefined();
      expect(api.logger.warn).toHaveBeenCalledWith(
        expect.stringContaining("ownership check failed"),
      );
    });
  });

  describe("message_received @-mention tracking", () => {
    beforeEach(() => {
      register(api as any);
    });

    it("tracks @-mentions and skips ownership check for mentioned threads", async () => {
      // Simulate receiving a message that @-mentions the agent.
      await hooks.message_received(
        { content: "Hey @TestBot help me", metadata: { threadTs: "9999.0001", channelId: "C456" } },
        { channelId: "slack", conversationId: "C456" },
      );

      // Now send in the same thread -- should skip the ownership HTTP call.
      const result = await hooks.message_sending(
        { content: "Sure!", metadata: { threadTs: "9999.0001", channelId: "C456" }, to: "C456" },
        { channelId: "slack", conversationId: "C456" },
      );

      expect(result).toBeUndefined();
      expect(globalThis.fetch).not.toHaveBeenCalled();
    });

    it("ignores @-mentions on non-slack channels", async () => {
      // Use a unique thread key so module-level state from other tests doesn't interfere.
      await hooks.message_received(
        { content: "Hey @TestBot", metadata: { threadTs: "7777.0001", channelId: "C999" } },
        { channelId: "discord", conversationId: "C999" },
      );

      // The mention should not have been tracked, so sending should still call fetch.
      vi.mocked(globalThis.fetch).mockResolvedValue(
        new Response(JSON.stringify({ owner: "test-agent" }), { status: 200 }),
      );

      await hooks.message_sending(
        { content: "Sure!", metadata: { threadTs: "7777.0001", channelId: "C999" }, to: "C999" },
        { channelId: "slack", conversationId: "C999" },
      );

      expect(globalThis.fetch).toHaveBeenCalled();
    });

    it("tracks bot user ID mentions via <@U999> syntax", async () => {
      await hooks.message_received(
        { content: "Hey <@U999> help", metadata: { threadTs: "8888.0001", channelId: "C789" } },
        { channelId: "slack", conversationId: "C789" },
      );

      const result = await hooks.message_sending(
        { content: "On it!", metadata: { threadTs: "8888.0001", channelId: "C789" }, to: "C789" },
        { channelId: "slack", conversationId: "C789" },
      );

      expect(result).toBeUndefined();
      expect(globalThis.fetch).not.toHaveBeenCalled();
    });
  });
});
