import fs from "node:fs/promises";
import os from "node:os";
import path from "node:path";
import { describe, expect, it } from "vitest";
import { buildWorkspaceSkillsPrompt } from "./skills.js";
import { writeSkill } from "./skills.test-helpers.js";

async function withTempWorkspace(run: (workspaceDir: string) => Promise<void>) {
  const workspaceDir = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-compact-"));
  try {
    await run(workspaceDir);
  } finally {
    await fs.rm(workspaceDir, { recursive: true, force: true });
  }
}

describe("compactSkillPaths", () => {
  it("replaces home directory prefix with ~ in skill locations", async () => {
    await withTempWorkspace(async (workspaceDir) => {
      const skillDir = path.join(workspaceDir, "skills", "test-skill");

      await writeSkill({
        dir: skillDir,
        name: "test-skill",
        description: "A test skill for path compaction",
      });

      const prompt = buildWorkspaceSkillsPrompt(workspaceDir, {
        bundledSkillsDir: path.join(workspaceDir, ".bundled-empty"),
        managedSkillsDir: path.join(workspaceDir, ".managed-empty"),
      });

      const home = os.homedir();
      // The prompt should NOT contain the absolute home directory path
      // when the skill is under the home directory (which tmpdir usually is on macOS)
      if (workspaceDir.startsWith(home)) {
        expect(prompt).not.toContain(home + path.sep);
        expect(prompt).toContain("~/");
      }

      // The skill name and description should still be present
      expect(prompt).toContain("test-skill");
      expect(prompt).toContain("A test skill for path compaction");
    });
  });

  it("preserves paths outside home directory", async () => {
    // Skills outside ~ should keep their absolute paths
    await withTempWorkspace(async (workspaceDir) => {
      const skillDir = path.join(workspaceDir, "skills", "ext-skill");

      await writeSkill({
        dir: skillDir,
        name: "ext-skill",
        description: "External skill",
      });

      const prompt = buildWorkspaceSkillsPrompt(workspaceDir, {
        bundledSkillsDir: path.join(workspaceDir, ".bundled-empty"),
        managedSkillsDir: path.join(workspaceDir, ".managed-empty"),
      });

      // Should still contain a valid location tag
      expect(prompt).toMatch(/<location>[^<]+SKILL\.md<\/location>/);
    });
  });
});