import { describe, it, expect } from "vitest";
import { parseSequence } from "../src/mermaidSequenceDiff";

describe("parseSequence", () => {
  it("captures explicit participants in order", () => {
    const d = parseSequence("sequenceDiagram\n participant A\n participant B\n A->>B: hi");
    expect(d.participants).toEqual(["A", "B"]);
  });

  it("captures message statements verbatim (trimmed)", () => {
    const d = parseSequence("sequenceDiagram\n A->>B: hi\n B-->>A: bye");
    expect(d.statements).toEqual(["A->>B: hi", "B-->>A: bye"]);
  });

  it("infers participants from messages when not declared", () => {
    const d = parseSequence("sequenceDiagram\n A->>B: hi\n B->>C: on");
    expect(d.participants).toEqual(["A", "B", "C"]);
  });

  it("ignores comments and blank lines", () => {
    const d = parseSequence("sequenceDiagram\n%% note\n\n A->>B: hi");
    expect(d.statements).toEqual(["A->>B: hi"]);
  });
});