import * as fs from "node:fs";
import * as os from "node:os";
import * as path from "node:path";
import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";
import { sendResponse, parseAttachments, validateAttachPath } from "../../src/discord/send-response";
import type { TextChannel, Message } from "discord.js";

function makeChannel() {
  return {
    send: vi.fn().mockResolvedValue({ id: "msg-1" }),
  } as unknown as TextChannel;
}

function makeMessage() {
  return {} as Message;
}

describe("parseAttachments", () => {
  it("returns empty attachPaths and original text when no markers", () => {
    const result = parseAttachments("Hello world", "/workspace");
    expect(result.text).toBe("Hello world");
    expect(result.attachPaths).toHaveLength(0);
  });

  it("extracts a single relative [ATTACH: ...] marker", () => {
    const result = parseAttachments("Here is the file [ATTACH: images/cat.jpg]", "/workspace");
    expect(result.text).toBe("Here is the file");
    expect(result.attachPaths).toHaveLength(1);
    expect(result.attachPaths[0]).toBe(path.resolve("/workspace", "images/cat.jpg"));
  });

  it("extracts an absolute [ATTACH: ...] marker unchanged", () => {
    const abs = path.resolve("/workspace/file.txt");
    const result = parseAttachments(`See [ATTACH: ${abs}]`, "/workspace");
    expect(result.attachPaths[0]).toBe(abs);
  });

  it("extracts multiple markers", () => {
    const result = parseAttachments(
      "Files: [ATTACH: a.txt] and [ATTACH: b.png]",
      "/workspace"
    );
    expect(result.attachPaths).toHaveLength(2);
    expect(result.text).toBe("Files:  and");
  });
});

describe("validateAttachPath", () => {
  let tmpDir: string;
  let tmpFile: string;

  beforeEach(() => {
    tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), "disclaw-test-"));
    tmpFile = path.join(tmpDir, "file.txt");
    fs.writeFileSync(tmpFile, "hello");
  });

  afterEach(() => {
    fs.rmSync(tmpDir, { recursive: true, force: true });
  });

  it("returns null for a valid readable file within workspace", () => {
    expect(validateAttachPath(tmpFile, tmpDir)).toBeNull();
  });

  it("rejects paths outside workspace (path traversal)", () => {
    const outsideFile = path.join(os.tmpdir(), "outside.txt");
    fs.writeFileSync(outsideFile, "secret");
    const err = validateAttachPath(outsideFile, tmpDir);
    expect(err).toMatch(/außerhalb/);
    fs.unlinkSync(outsideFile);
  });

  it("rejects non-existent files", () => {
    const missing = path.join(tmpDir, "ghost.txt");
    const err = validateAttachPath(missing, tmpDir);
    expect(err).toMatch(/nicht lesbar/);
  });
});

describe("sendResponse", () => {
  beforeEach(() => {
    vi.clearAllMocks();
  });

  it("sends chunks via channel.send() for text <= 4000 chars", async () => {
    const channel = makeChannel();
    await sendResponse(channel, "Hello, world!", makeMessage());
    expect(channel.send).toHaveBeenCalledTimes(1);
    const call = vi.mocked(channel.send).mock.calls[0][0];
    expect(typeof call).toBe("string");
  });

  it("sends an attachment for text > 4000 chars", async () => {
    const channel = makeChannel();
    await sendResponse(channel, "x".repeat(4001), makeMessage());
    expect(channel.send).toHaveBeenCalledTimes(1);
    const call = vi.mocked(channel.send).mock.calls[0][0];
    expect(typeof call).toBe("object");
    expect((call as { files: unknown[] }).files).toHaveLength(1);
  });

  it("does not call channel.send() for empty text", async () => {
    const channel = makeChannel();
    await sendResponse(channel, "", makeMessage());
    expect(channel.send).not.toHaveBeenCalled();
  });

  it("sends [ATTACH: ...] file as Discord attachment", async () => {
    const tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), "disclaw-attach-"));
    const filePath = path.join(tmpDir, "result.txt");
    fs.writeFileSync(filePath, "data");

    try {
      const channel = makeChannel();
      await sendResponse(channel, `Here it is [ATTACH: result.txt]`, makeMessage(), tmpDir);

      // One call for the file, one for the text
      expect(channel.send).toHaveBeenCalledTimes(2);
      const fileCall = vi.mocked(channel.send).mock.calls[0][0] as { files: unknown[] };
      expect(fileCall.files).toHaveLength(1);
      const textCall = vi.mocked(channel.send).mock.calls[1][0];
      expect(typeof textCall).toBe("string");
      expect(textCall as string).toContain("Here it is");
    } finally {
      fs.rmSync(tmpDir, { recursive: true, force: true });
    }
  });

  it("sends warning message for file outside workspace", async () => {
    const tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), "disclaw-ws-"));
    const outsideDir = fs.mkdtempSync(path.join(os.tmpdir(), "disclaw-out-"));
    const outsideFile = path.join(outsideDir, "secret.txt");
    fs.writeFileSync(outsideFile, "secret");

    try {
      const channel = makeChannel();
      await sendResponse(channel, `[ATTACH: ${outsideFile}]`, makeMessage(), tmpDir);
      expect(channel.send).toHaveBeenCalledTimes(1);
      const call = vi.mocked(channel.send).mock.calls[0][0] as string;
      expect(call).toMatch(/⚠️/);
    } finally {
      fs.rmSync(tmpDir, { recursive: true, force: true });
      fs.rmSync(outsideDir, { recursive: true, force: true });
    }
  });

  it("only sends text when no [ATTACH: ...] present and workspacePath given", async () => {
    const tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), "disclaw-plain-"));
    try {
      const channel = makeChannel();
      await sendResponse(channel, "Plain text response", makeMessage(), tmpDir);
      expect(channel.send).toHaveBeenCalledTimes(1);
      expect(vi.mocked(channel.send).mock.calls[0][0]).toBe("Plain text response");
    } finally {
      fs.rmSync(tmpDir, { recursive: true, force: true });
    }
  });
});