import { describe, expect, it } from "vitest";
import { readSnipContext, snipDirectory } from "../lib/snip";

/**
 * The snip handoff crosses a command boundary as a serialized launch context, so
 * every field arrives as unknown. This is the boundary where a wrong type would
 * otherwise reach the file system as a path.
 */

describe("readSnipContext", () => {
  it("reads the fields the snip command writes", () => {
    expect(
      readSnipContext({
        snipPath: "/tmp/snip.png",
        snipError: "no tool",
        sessionId: "abc123",
      }),
    ).toEqual({ snipPath: "/tmp/snip.png", snipError: "no tool", sessionId: "abc123" });
  });

  it("returns nothing for a launch with no context at all", () => {
    expect(readSnipContext(undefined)).toEqual({});
    expect(readSnipContext(null)).toEqual({});
  });

  it("ignores a context that is not an object", () => {
    expect(readSnipContext("snip.png")).toEqual({});
    expect(readSnipContext(42)).toEqual({});
    expect(readSnipContext(["/tmp/snip.png"])).toEqual({});
  });

  it("drops a value that is not a string rather than passing it on", () => {
    // A number or object here would reach `readAttachment` as a path.
    expect(readSnipContext({ snipPath: 42, sessionId: { id: "x" } })).toEqual({});
  });

  it("treats an empty string as absent", () => {
    expect(readSnipContext({ snipPath: "", sessionId: "" })).toEqual({});
  });

  it("ignores unknown keys, so a stray field cannot widen the contract", () => {
    expect(readSnipContext({ snipPath: "/tmp/snip.png", somethingElse: "/etc/passwd" })).toEqual({
      snipPath: "/tmp/snip.png",
    });
  });

  it("reads a payload that only names a conversation, which is a cancelled snip", () => {
    expect(readSnipContext({ sessionId: "abc123" })).toEqual({ sessionId: "abc123" });
  });
});

describe("snipDirectory", () => {
  it("keeps snips under the extension's support directory, not a temp directory", () => {
    // A stored conversation holds the path, so it has to survive a reboot.
    expect(snipDirectory()).toBe("/tmp/lam-agent-support/snips");
  });
});