import test from "node:test";
import assert from "node:assert/strict";
import { buildPrChangeSummary } from "../src/workflows/github_pr_monitor.js";

const build = buildPrChangeSummary as any;

test("buildPrChangeSummary reports all fields on first snapshot", () => {
  const after = {
    number: 1,
    title: "A",
    url: "u",
    state: "OPEN",
    isDraft: false,
    mergeable: "MERGEABLE",
    reviewDecision: "REVIEW_REQUIRED",
    updatedAt: "t1",
    baseRefName: "main",
    headRefName: "feat",
  };

  const res = build(null, after);
  assert.ok(res.changedFields.length > 0);
  assert.equal(res.changes.title.to, "A");
});

test("buildPrChangeSummary only includes changed fields", () => {
  const before = {
    number: 1,
    title: "A",
    url: "u",
    state: "OPEN",
    isDraft: false,
    mergeable: "MERGEABLE",
    reviewDecision: null,
    updatedAt: "t1",
    baseRefName: "main",
    headRefName: "feat",
  };
  const after = { ...before, title: "B", updatedAt: "t2" };

  const res = build(before, after);
  assert.deepEqual(res.changedFields.sort(), ["title", "updatedAt"].sort());
  assert.equal(res.changes.title.from, "A");
  assert.equal(res.changes.title.to, "B");
});