import { spawnSync } from "node:child_process";
import { describe, expect, test } from "bun:test";
import { repoRoot } from "./config";
import { sshHelp, sshHelpScope } from "./help";

describe("ssh download scoped help", () => {
  test("selects only the exact help-first download scope", () => {
    expect(sshHelpScope(["ssh", "--help", "download"])).toBe("download");
    expect(sshHelpScope(["ssh", "help", "download"])).toBe("download");
    expect(sshHelpScope(["ssh", "--help"])).toBeUndefined();
    expect(sshHelpScope(["ssh", "NC01:k3s", "--help"])).toBeUndefined();
    expect(sshHelpScope(["ssh", "--help", "download", "extra"])).toBeUndefined();
  });

  test("keeps download help bounded and discloses the executing source root", () => {
    const scoped = sshHelp("download") as {
      scope: string;
      runtime: { repoRoot: string; cliPath: string; cwdSelectsRepoRoot: boolean; rootSelection: { environmentVariable: string } };
      usage: string[];
      examples: Record<string, string>;
      contract: { pathOrder: string[]; transport: string; verification: { automatic: boolean } };
    };
    const full = sshHelp() as { usage: string[] };
    const serialized = JSON.stringify(scoped);

    expect(scoped.scope).toBe("download");
    expect(scoped.usage.length).toBeLessThanOrEqual(4);
    expect(scoped.usage.length).toBeLessThan(full.usage.length);
    expect(Buffer.byteLength(serialized, "utf8")).toBeLessThan(10_240);
    expect(serialized).not.toContain("git exact-commit");
    expect(scoped.runtime.repoRoot).toBe(repoRoot);
    expect(scoped.runtime.cliPath).toBe(`${repoRoot}/scripts/ssh-cli.ts`);
    expect(scoped.runtime.cwdSelectsRepoRoot).toBe(false);
    expect(scoped.runtime.rootSelection.environmentVariable).toBe("UNIDESK_TRANS_REPO_ROOT");
    expect(scoped.contract.pathOrder).toEqual(["remote-file", "local-file"]);
    expect(scoped.contract.transport).toBe("host.ssh.tcp-pool");
    expect(scoped.contract.verification.automatic).toBe(true);
    expect(scoped.examples.host).toContain("download /tmp/trace.json ./trace.json");
    expect(scoped.examples.k3sWorkload).toBe(
      "trans NC01:k3s:hwlab-v03:hwlab-cloud-api:hwlab-cloud-api download /tmp/trace.json ./trace.json",
    );
    expect(scoped.examples.windowsDrive).toContain("D:\\tmp\\trace.json");
    expect(scoped.examples.explicitWorktree).toBe(
      `UNIDESK_TRANS_REPO_ROOT=${repoRoot} trans NC01:k3s:hwlab-v03:hwlab-cloud-api:hwlab-cloud-api download /tmp/trace.json ./trace.json`,
    );
  });

  test("renders the original trans command without stdout dump fallback", () => {
    const result = spawnSync("bun", ["scripts/ssh-cli.ts", "--help", "download"], {
      cwd: repoRoot,
      env: {
        ...process.env,
        UNIDESK_SSH_ENTRYPOINT: "trans",
        UNIDESK_TRANS_REPO_ROOT: repoRoot,
      },
      encoding: "utf8",
    });

    expect(result.status).toBe(0);
    expect(result.stderr).toBe("");
    expect(Buffer.byteLength(result.stdout, "utf8")).toBeLessThan(10_240);
    const rendered = JSON.parse(result.stdout) as {
      ok: boolean;
      command: string;
      data: { scope: string; runtime: { repoRoot: string }; usage: string[]; outputTruncated?: boolean };
    };
    expect(rendered.ok).toBe(true);
    expect(rendered.command).toBe("trans --help download");
    expect(rendered.data.scope).toBe("download");
    expect(rendered.data.runtime.repoRoot).toBe(repoRoot);
    expect(rendered.data.usage.length).toBeLessThanOrEqual(4);
    expect(rendered.data.outputTruncated).toBeUndefined();

    const unified = spawnSync("bun", ["scripts/cli.ts", "ssh", "--help", "download"], {
      cwd: repoRoot,
      env: process.env,
      encoding: "utf8",
    });
    expect(unified.status).toBe(0);
    expect(unified.stderr).toBe("");
    const unifiedRendered = JSON.parse(unified.stdout) as { data: { scope: string; runtime: { repoRoot: string } } };
    expect(unifiedRendered.data.scope).toBe("download");
    expect(unifiedRendered.data.runtime.repoRoot).toBe(repoRoot);
  });
});