/**
 * @file Tests for server/lib/lane-features.js: slug canonicalization,
 * activate/archive semantics, and read access to a lane's feature history.
 * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
 */

const os = require("node:os");
const path = require("node:path");
const fs = require("node:fs");

const SUITE_ROOT = fs.mkdtempSync(path.join(os.tmpdir(), "ccam-lane-features-"));
process.env.DASHBOARD_DB_PATH = path.join(SUITE_ROOT, "dashboard.db");
process.env.LANES_ROOT = path.join(SUITE_ROOT, "lanes");

const { describe, it, after } = require("node:test");
const assert = require("node:assert/strict");

const lanesLib = require("../lib/lanes");
const features = require("../lib/lane-features");

after(() => fs.rmSync(SUITE_ROOT, { recursive: true, force: true }));

let laneSeq = 0;
function makeLane() {
  laneSeq += 1;
  const cwd = path.join(SUITE_ROOT, `lane-cwd-${laneSeq}`);
  fs.mkdirSync(cwd, { recursive: true });
  return lanesLib.createLane({ title: `lane ${laneSeq}`, cwd, kind: "managed" });
}

describe("canonicalizeSlug", () => {
  it("drops a leading feat/ prefix", () => {
    assert.equal(features.canonicalizeSlug("feat/my-thing"), "my-thing");
  });

  it("turns slashes and spaces into a single flat dash-separated segment", () => {
    assert.equal(features.canonicalizeSlug("feat/some thing/ nested"), "some-thing-nested");
  });

  it("keeps dots, underscores, and case as-is (unlike worktree.js:slugify)", () => {
    assert.equal(features.canonicalizeSlug("My_Feature.v2"), "My_Feature.v2");
  });

  it("collapses repeated separators and trims leading/trailing dashes", () => {
    assert.equal(features.canonicalizeSlug("feat//too  many///slashes/"), "too-many-slashes");
  });

  it("refuses an empty result", () => {
    assert.throws(
      () => features.canonicalizeSlug("feat/"),
      (err) => err.code === "EBADSLUG"
    );
    assert.throws(
      () => features.canonicalizeSlug("   "),
      (err) => err.code === "EBADSLUG"
    );
  });
});

describe("activateFeature / archiveActiveFeature", () => {
  it("activating a brand-new slug creates a live (unarchived) feature row and points the lane at it", () => {
    const lane = makeLane();
    const { lane: updated, feature } = features.activateFeature(lane.id, "feat/one");
    assert.equal(feature.slug, "one");
    assert.equal(feature.archived_at, null);
    assert.equal(updated.active_feature_id, feature.id);
  });

  it("activating a second slug archives the first with its final stage intact", () => {
    const lane = makeLane();
    features.activateFeature(lane.id, "one");
    lanesLib.setStage(lane.id, { stage: "review", evidence: "looks good" });

    const { feature: second } = features.activateFeature(lane.id, "two");
    assert.equal(second.slug, "two");
    assert.equal(second.archived_at, null);

    const first = features.getFeature(lane.id, "one");
    assert.notEqual(first.archived_at, null);
    assert.equal(first.stage, "review");
    assert.deepEqual(first.stages.review.evidence, "looks good");
  });

  it("re-activating an archived slug restores its saved stage onto the live lane row", () => {
    const lane = makeLane();
    features.activateFeature(lane.id, "one");
    lanesLib.setStage(lane.id, { stage: "implement" });
    features.activateFeature(lane.id, "two"); // archives "one" at stage=implement

    const { lane: reactivated } = features.activateFeature(lane.id, "one");
    assert.equal(reactivated.stage, "implement");
    assert.equal(features.getFeature(lane.id, "one").archived_at, null);
    assert.notEqual(features.getFeature(lane.id, "two").archived_at, null);
  });

  it("re-activating the CURRENTLY active slug is a no-op, not a self-archive", () => {
    const lane = makeLane();
    features.activateFeature(lane.id, "one");
    lanesLib.setStage(lane.id, { stage: "review" });
    const { lane: updated } = features.activateFeature(lane.id, "one");
    assert.equal(updated.stage, "review");
    assert.equal(features.getFeature(lane.id, "one").archived_at, null);
  });

  it("archiveActiveFeature returns null and touches nothing when no feature is active", () => {
    const lane = makeLane();
    assert.equal(features.archiveActiveFeature(lane.id), null);
  });

  it("echoes back the canonicalized slug, not the caller's raw input", () => {
    const lane = makeLane();
    const { feature } = features.activateFeature(lane.id, "feat/Weird Input/");
    assert.equal(feature.slug, "Weird-Input");
  });

  it("a feature's own title survives being archived (never clobbered by the lane's title)", () => {
    const lane = makeLane();
    features.activateFeature(lane.id, "one", { title: "Custom title" });
    features.activateFeature(lane.id, "two"); // archives "one"
    assert.equal(features.getFeature(lane.id, "one").title, "Custom title");
  });

  it("links survive a full activate -> archive -> reactivate round trip", () => {
    const lane = makeLane();
    features.activateFeature(lane.id, "one");
    lanesLib.updateLane(lane.id, { links: { pr: "https://example.com/pr/1" } });
    features.activateFeature(lane.id, "two"); // archives "one" with its links

    const archived = features.getFeature(lane.id, "one");
    assert.deepEqual(archived.links, { pr: "https://example.com/pr/1" });

    const { lane: reactivated } = features.activateFeature(lane.id, "one");
    assert.deepEqual(reactivated.links, { pr: "https://example.com/pr/1" });
  });
});

describe("listFeatures / getFeature", () => {
  it("lists every feature for a lane, most recently touched first", () => {
    const lane = makeLane();
    features.activateFeature(lane.id, "one");
    features.activateFeature(lane.id, "two");
    const list = features.listFeatures(lane.id);
    assert.deepEqual(
      list.map((f) => f.slug),
      ["two", "one"]
    );
  });

  it("getFeature returns null for an unknown slug", () => {
    const lane = makeLane();
    assert.equal(features.getFeature(lane.id, "never-activated"), null);
  });
});
