import assert from "node:assert/strict";
import { test } from "node:test";
import { createServer } from "node:http";

// **A pull request opened after its push is still checked** (novox/hq issue 347). The announcer read only the
// repositories whose update time moved since its last pass, less a minute's margin; opening, reopening or
// retargeting a pull request does not move a repository's update time, so a pull request opened more than a
// minute or so after its push was never announced, never checked, and nothing said so.

const repo = (full: string, updated: string) => {
  const [owner, name] = full.split("/");
  return { full_name: full, owner, name, private: false, html_url: "", updated_at: updated };
};

test("a pull request opened after the margin is looked at, by its own update time", async () => {
  const { reposToLook } = await import("../pulls.ts");
  const pushed = "2026-10-09T10:00:00Z"; // the branch pushed: the repository's update time
  // The pull request opened two minutes later; the last pass was at 10:02:30, so the floor is 10:01:30.
  const floor = "2026-10-09T10:01:30Z";
  const repos = [repo("novox/mesh-sdk", pushed), repo("novox/hq", "2026-10-09T09:00:00Z")];
  const opened = [{ owner: "novox", name: "mesh-sdk", updated_at: "2026-10-09T10:02:00Z" }];
  assert.deepEqual(reposToLook(repos, floor, opened, false).map((r) => r.full_name), ["novox/mesh-sdk"],
    "the repository of a pull request updated since the floor, though the repository itself did not move");
  assert.deepEqual(reposToLook(repos, floor, [], false).map((r) => r.full_name), [],
    "without the pull request's own time nothing is looked at — the fault");
  assert.deepEqual(reposToLook(repos, floor, [], true).map((r) => r.full_name).sort(), ["novox/hq", "novox/mesh-sdk"],
    "a sweep looks at every repository");
  assert.deepEqual(reposToLook(repos, "", [], false).length, 2, "the first pass looks at every repository");
});

test("every open pull request is read with what its base requires and what its head has (gitea_open_pulls)", async () => {
  const { GiteaClient } = await import("../client.ts");
  const asked: string[] = [];
  const server = createServer((req, res) => {
    asked.push(req.url ?? "");
    const url = req.url ?? "";
    const send = (v: unknown) => res.end(JSON.stringify(v));
    if (url.startsWith("/api/v1/repos/issues/search")) {
      return send(url.includes("page=1") ? [
        { number: 243, repository: { owner: "novox", name: "hq", full_name: "novox/hq" }, updated_at: "2026-10-09T11:00:00Z" },
        { number: 14, repository: { owner: "novox", name: "mesh-sdk", full_name: "novox/mesh-sdk" } },
      ] : []);
    }
    if (url.startsWith("/api/v1/repos/novox/hq/pulls/243")) {
      return send({ number: 243, state: "open", base: { ref: "main" }, head: { ref: "x", sha: "aaa1111" }, html_url: "h" });
    }
    if (url.startsWith("/api/v1/repos/novox/mesh-sdk/pulls/14")) {
      return send({ number: 14, state: "open", base: { ref: "main" }, head: { ref: "y", sha: "bbb2222" }, html_url: "s" });
    }
    if (url.startsWith("/api/v1/repos/novox/hq/branch_protections")) {
      return send([{ rule_name: "main", enable_status_check: true, status_check_contexts: ["mesh/repo-check"] }]);
    }
    if (url.startsWith("/api/v1/repos/novox/mesh-sdk/branch_protections")) {
      return send([{ rule_name: "main", enable_status_check: true, status_check_contexts: ["mesh/merge-gate", "mesh/repo-check"] }]);
    }
    if (url.includes("/commits/aaa1111/status")) return send({ statuses: [] });
    if (url.includes("/commits/bbb2222/status")) return send({ statuses: [{ context: "mesh/merge-gate", status: "pending",
      description: "the mesh is mapping this head onto its module graph", updated_at: "2026-10-11T00:11:39Z" }] });
    res.statusCode = 404;
    res.end("{}");
  });
  await new Promise<void>((r) => server.listen(0, r));
  const client = new GiteaClient(`http://127.0.0.1:${(server.address() as any).port}`, "t");
  try {
    const open = await client.openPulls();
    assert.deepEqual(open.map((p) => [p.owner, p.repo, p.number, p.base, p.head_sha, p.required, p.statuses]), [
      ["novox", "hq", 243, "main", "aaa1111", ["mesh/repo-check"], []],
      ["novox", "mesh-sdk", 14, "main", "bbb2222", ["mesh/merge-gate", "mesh/repo-check"], ["mesh/merge-gate"]],
    ]);
    // Each status with its state and time (novox/hq issue 438): a check pending is told from one that answered.
    assert.deepEqual(open.map((p) => p.checks), [{}, { "mesh/merge-gate": { state: "pending",
      description: "the mesh is mapping this head onto its module graph", updated_at: "2026-10-11T00:11:39Z" } }]);
  } finally {
    server.close();
  }
});

test("a pull request or issue number that is not one is refused before the forge is asked", async () => {
  const { GiteaClient } = await import("../client.ts");
  let asked = 0;
  const server = createServer((_req, res) => {
    asked++;
    res.end("{}");
  });
  await new Promise<void>((r) => server.listen(0, r));
  const client = new GiteaClient(`http://127.0.0.1:${(server.address() as any).port}`, "t");
  try {
    await assert.rejects(client.getPullRequest("novox", "hq", Number(undefined)), /whole number/);
    await assert.rejects(client.addComment("novox", "hq", 0, "x"), /whole number/);
    await assert.rejects(client.listPullFiles("novox", "hq", 1.5), /whole number/);
    assert.equal(asked, 0, "the forge was asked about pulls/NaN");
  } finally {
    server.close();
  }
});

// **A merge names the branch it came from, also once that branch is deleted** (novox/hq issue 578). On 2026-10-12
// the merge tool merged mesh-controller #271 and mesh-catalog #251, one delivery group, and deleted each branch. The
// forge then read each pull request's head.ref as `refs/pull/<n>/head`, and `pull.merged` named that as the head: the
// controller asked mesh-delivery for a group of that name, found none, and cut #251's walk at once, before #271's,
// which the group's order put first.
test("a merged pull request whose branch was deleted is announced with its branch, not its pull ref", async () => {
  const { GiteaClient, headBranchOf } = await import("../client.ts");
  const group = "feat/341-a-merge-check-judges-the-merge";
  // As the forge answered for #251 after its merge.
  const merged = {
    number: 251, title: "A verdict goes out of date when its trunk moves", state: "closed", merged: true,
    merged_at: "2026-10-12T16:11:29Z", merge_commit_sha: "23ea0f431faf91aa83e7b0297e0a9e442180f0c7",
    head: { label: group, ref: "refs/pull/251/head", sha: "41b6e10077efdef694b519879fcbaeaf69d472b1" },
    base: { label: "main", ref: "main" }, html_url: "http://fake/novox/mesh-catalog/pulls/251",
  };
  const server = createServer((req, res) => {
    const url = req.url ?? "";
    const send = (v: unknown) => res.end(JSON.stringify(v));
    if (url.startsWith("/api/v1/repos/novox/mesh-catalog/pulls/251")) return send(merged);
    if (url.startsWith("/api/v1/repos/novox/mesh-catalog/pulls?")) return send([merged]);
    res.statusCode = 404;
    res.end("{}");
  });
  await new Promise<void>((r) => server.listen(0, r));
  const client = new GiteaClient(`http://127.0.0.1:${(server.address() as any).port}`, "t");
  try {
    // What the announcer reads each pass, and what `pull.merged` carries as its head.
    const listed = await client.listPullRequests("novox", "mesh-catalog", { state: "closed", sort: "recentupdate", limit: "20" });
    assert.deepEqual(listed.map((p) => p.head), [group], "the pass names the group's branch, never refs/pull/251/head");
    assert.equal((await client.getPullRequest("novox", "mesh-catalog", 251)).head, group);
  } finally {
    server.close();
  }
  // While the branch exists the forge says it as ref, and that is what is named; a label alone is the branch too.
  assert.equal(headBranchOf({ label: "feat/x", ref: "feat/x" }), "feat/x");
  assert.equal(headBranchOf({ label: "feat/x" }), "feat/x");
  assert.equal(headBranchOf({ ref: "feat/x" }), "feat/x");
  // A branch whose own name only looks like a pull ref's start is still a branch.
  assert.equal(headBranchOf({ label: "y", ref: "refs/pulled" }), "refs/pulled");
  // No label to read: the pull ref is all the forge said, and it is kept rather than made up.
  assert.equal(headBranchOf({ ref: "refs/pull/7/head" }), "refs/pull/7/head");
  assert.equal(headBranchOf(undefined), undefined);
});