import { describe, expect, it } from "vitest";

import { ConvoyTransitionError, validateConvoyTransition } from "./state-machine";

describe("validateConvoyTransition", () => {
  it("rejects draft → released", () => {
    expect(() =>
      validateConvoyTransition({
        from: "draft",
        to: "released",
        actor: "human-gate-1",
      }),
    ).toThrow(ConvoyTransitionError);

    try {
      validateConvoyTransition({
        from: "draft",
        to: "released",
        actor: "human-gate-1",
      });
    } catch (error) {
      expect(error).toBeInstanceOf(ConvoyTransitionError);
      expect((error as ConvoyTransitionError).code).toBe("INVALID_TRANSITION");
    }
  });

  it("rejects role-architect on human-gate-1 transition", () => {
    expect(() =>
      validateConvoyTransition({
        from: "convoy_review",
        to: "ready",
        actor: "role-architect",
      }),
    ).toThrow(ConvoyTransitionError);

    try {
      validateConvoyTransition({
        from: "convoy_review",
        to: "ready",
        actor: "role-architect",
      });
    } catch (error) {
      expect((error as ConvoyTransitionError).code).toBe("FORBIDDEN_ACTOR");
    }
  });

  it("allows human-gate-1 to approve plan", () => {
    expect(() =>
      validateConvoyTransition({
        from: "convoy_review",
        to: "ready",
        actor: "human-gate-1",
      }),
    ).not.toThrow();
  });

  it("allows role-architect to submit plan for review", () => {
    expect(() =>
      validateConvoyTransition({
        from: "draft",
        to: "convoy_review",
        actor: "role-architect",
      }),
    ).not.toThrow();
  });

  it("requires reason for blocked transitions", () => {
    try {
      validateConvoyTransition({
        from: "ready",
        to: "blocked",
        actor: "role-implementer",
      });
    } catch (error) {
      expect((error as ConvoyTransitionError).code).toBe("REASON_REQUIRED");
    }
  });
});