import fs from "node:fs/promises";
import os from "node:os";
import path from "node:path";
import { describe, expect, it } from "vitest";
import { buildWorkspaceSkillCommandSpecs } from "./skills.js";

async function writeSkill(params: {
  dir: string;
  name: string;
  description: string;
  frontmatterExtra?: string;
}) {
  const { dir, name, description, frontmatterExtra } = params;
  await fs.mkdir(dir, { recursive: true });
  await fs.writeFile(
    path.join(dir, "SKILL.md"),
    `---
name: ${name}
description: ${description}
${frontmatterExtra ?? ""}
---

# ${name}
`,
    "utf-8",
  );
}

describe("buildWorkspaceSkillCommandSpecs", () => {
  it("sanitizes and de-duplicates command names", async () => {
    const workspaceDir = await fs.mkdtemp(path.join(os.tmpdir(), "clawdbot-"));
    await writeSkill({
      dir: path.join(workspaceDir, "skills", "hello-world"),
      name: "hello-world",
      description: "Hello world skill",
    });
    await writeSkill({
      dir: path.join(workspaceDir, "skills", "hello_world"),
      name: "hello_world",
      description: "Hello underscore skill",
    });
    await writeSkill({
      dir: path.join(workspaceDir, "skills", "help"),
      name: "help",
      description: "Help skill",
    });
    await writeSkill({
      dir: path.join(workspaceDir, "skills", "hidden"),
      name: "hidden-skill",
      description: "Hidden skill",
      frontmatterExtra: "user-invocable: false",
    });

    const commands = buildWorkspaceSkillCommandSpecs(workspaceDir, {
      managedSkillsDir: path.join(workspaceDir, ".managed"),
      bundledSkillsDir: path.join(workspaceDir, ".bundled"),
      reservedNames: new Set(["help"]),
    });

    const names = commands.map((entry) => entry.name).sort();
    expect(names).toEqual(["hello_world", "hello_world_2", "help_2"]);
    expect(commands.find((entry) => entry.skillName === "hidden-skill")).toBeUndefined();
  });

  it("truncates descriptions longer than 100 characters for Discord compatibility", async () => {
    const workspaceDir = await fs.mkdtemp(path.join(os.tmpdir(), "clawdbot-"));
    const longDescription =
      "This is a very long description that exceeds Discord's 100 character limit for slash command descriptions and should be truncated";
    await writeSkill({
      dir: path.join(workspaceDir, "skills", "long-desc"),
      name: "long-desc",
      description: longDescription,
    });
    await writeSkill({
      dir: path.join(workspaceDir, "skills", "short-desc"),
      name: "short-desc",
      description: "Short description",
    });

    const commands = buildWorkspaceSkillCommandSpecs(workspaceDir, {
      managedSkillsDir: path.join(workspaceDir, ".managed"),
      bundledSkillsDir: path.join(workspaceDir, ".bundled"),
    });

    const longCmd = commands.find((entry) => entry.skillName === "long-desc");
    const shortCmd = commands.find((entry) => entry.skillName === "short-desc");

    expect(longCmd?.description.length).toBeLessThanOrEqual(100);
    expect(longCmd?.description.endsWith("…")).toBe(true);
    expect(shortCmd?.description).toBe("Short description");
  });

  it("includes tool-dispatch metadata from frontmatter", async () => {
    const workspaceDir = await fs.mkdtemp(path.join(os.tmpdir(), "clawdbot-"));
    await writeSkill({
      dir: path.join(workspaceDir, "skills", "tool-dispatch"),
      name: "tool-dispatch",
      description: "Dispatch to a tool",
      frontmatterExtra: "command-dispatch: tool\ncommand-tool: sessions_send",
    });

    const commands = buildWorkspaceSkillCommandSpecs(workspaceDir);
    const cmd = commands.find((entry) => entry.skillName === "tool-dispatch");
    expect(cmd?.dispatch).toEqual({ kind: "tool", toolName: "sessions_send", argMode: "raw" });
  });
});