import fs from "node:fs/promises";
import path from "node:path";
import { describe, expect, it } from "vitest";
import { withTempDir } from "../test-helpers/temp-dir.js";
import {
  isExecutableFile,
  resolveExecutableFromPathEnv,
  resolveExecutablePath,
} from "./executable-path.js";

describe("executable path helpers", () => {
  it("detects executable files and rejects directories or non-executables", async () => {
    await withTempDir({ prefix: "openclaw-exec-path-" }, async (base) => {
      const execPath = path.join(base, "tool");
      const filePath = path.join(base, "plain.txt");
      const dirPath = path.join(base, "dir");
      await fs.writeFile(execPath, "#!/bin/sh\nexit 0\n", "utf8");
      await fs.chmod(execPath, 0o755);
      await fs.writeFile(filePath, "nope", "utf8");
      await fs.mkdir(dirPath);

      expect(isExecutableFile(execPath)).toBe(true);
      expect(isExecutableFile(filePath)).toBe(false);
      expect(isExecutableFile(dirPath)).toBe(false);
      expect(isExecutableFile(path.join(base, "missing"))).toBe(false);
    });
  });

  it("resolves executables from PATH entries and cwd-relative paths", async () => {
    await withTempDir({ prefix: "openclaw-exec-path-" }, async (base) => {
      const binDir = path.join(base, "bin");
      const cwd = path.join(base, "cwd");
      await fs.mkdir(binDir, { recursive: true });
      await fs.mkdir(cwd, { recursive: true });

      const pathTool = path.join(binDir, "runner");
      const cwdTool = path.join(cwd, "local-tool");
      await fs.writeFile(pathTool, "#!/bin/sh\nexit 0\n", "utf8");
      await fs.writeFile(cwdTool, "#!/bin/sh\nexit 0\n", "utf8");
      await fs.chmod(pathTool, 0o755);
      await fs.chmod(cwdTool, 0o755);

      expect(resolveExecutableFromPathEnv("runner", `${binDir}${path.delimiter}/usr/bin`)).toBe(
        pathTool,
      );
      expect(resolveExecutableFromPathEnv("missing", binDir)).toBeUndefined();
      expect(resolveExecutablePath("./local-tool", { cwd })).toBe(cwdTool);
      expect(resolveExecutablePath("runner", { env: { PATH: binDir } })).toBe(pathTool);
      expect(resolveExecutablePath("missing", { env: { PATH: binDir } })).toBeUndefined();
    });
  });

  it("resolves absolute, home-relative, and Path-cased env executables", async () => {
    await withTempDir({ prefix: "openclaw-exec-path-" }, async (base) => {
      const homeDir = path.join(base, "home");
      const binDir = path.join(base, "bin");
      await fs.mkdir(homeDir, { recursive: true });
      await fs.mkdir(binDir, { recursive: true });

      const homeTool = path.join(homeDir, "home-tool");
      const absoluteTool = path.join(base, "absolute-tool");
      const pathTool = path.join(binDir, "runner");
      await fs.writeFile(homeTool, "#!/bin/sh\nexit 0\n", "utf8");
      await fs.writeFile(absoluteTool, "#!/bin/sh\nexit 0\n", "utf8");
      await fs.writeFile(pathTool, "#!/bin/sh\nexit 0\n", "utf8");
      await fs.chmod(homeTool, 0o755);
      await fs.chmod(absoluteTool, 0o755);
      await fs.chmod(pathTool, 0o755);

      expect(resolveExecutablePath(absoluteTool)).toBe(absoluteTool);
      expect(
        path.normalize(resolveExecutablePath("~/home-tool", { env: { HOME: homeDir } }) ?? ""),
      ).toBe(path.normalize(homeTool));
      expect(path.normalize(resolveExecutablePath("runner", { env: { Path: binDir } }) ?? "")).toBe(
        path.normalize(pathTool),
      );
      expect(resolveExecutablePath("~/missing-tool", { env: { HOME: homeDir } })).toBeUndefined();
    });
  });

  it("does not treat drive-less rooted windows paths as cwd-relative executables", () => {
    if (process.platform !== "win32") {
      return;
    }

    expect(
      resolveExecutablePath(String.raw`:\Users\demo\AI\system\openclaw\git.exe`, {
        cwd: String.raw`C:\Users\demo\AI\system\openclaw`,
      }),
    ).toBeUndefined();
    expect(
      resolveExecutablePath(String.raw`:/Users/demo/AI/system/openclaw/git.exe`, {
        cwd: String.raw`C:\Users\demo\AI\system\openclaw`,
      }),
    ).toBeUndefined();
  });
});