import { describe, test } from "node:test";
import assert from "node:assert/strict";
import { spawnSync } from "node:child_process";
import { fileURLToPath } from "node:url";
import { mkdtempSync, mkdirSync, rmSync, writeFileSync, readFileSync, existsSync } from "node:fs";
import { join } from "node:path";
import { tmpdir } from "node:os";

// Resolve the package root (scripts/editions) so the subprocess `src/cli.ts` path +
// the `tsx` loader resolve regardless of the runner's cwd.
const editionsDir = fileURLToPath(new URL("..", import.meta.url));

function run(args: string[], dataRoot?: string): { status: number | null; stdout: string; stderr: string } {
  const res = spawnSync("node", ["--import", "tsx", "src/cli.ts", ...args], {
    encoding: "utf8",
    cwd: editionsDir,
    env: dataRoot ? { ...process.env, LINKEDIN_STUDIO_DATA: dataRoot } : process.env,
  });
  return { status: res.status, stdout: res.stdout, stderr: res.stderr };
}

const T1 = "2026-07-21T09:30:00.000Z";
const T2 = "2026-07-24T09:30:00.000Z";

/** A scratch series root with a realistic edition-state.json, plus a scratch data dir. */
function fixture(): { dir: string; statePath: string; dataRoot: string; seriesRoot: string } {
  const dir = mkdtempSync(join(tmpdir(), "editions-cli-register-"));
  const seriesRoot = join(dir, "series", "seres");
  const statePath = join(seriesRoot, "linkedin", "edition-state.json");
  mkdirSync(join(seriesRoot, "linkedin"), { recursive: true });
  writeFileSync(
    statePath,
    JSON.stringify(
      {
        schemaVersion: 1,
        series: { slug: "seres", title: "Seres" },
        currentArticle: "05",
        currentPhase: "skeleton-pitch",
        articles: { "05": { title: "Da pipelinen brøt sammen", phase: "skeleton-pitch", phaseLog: [] } },
      },
      null,
      2,
    ) + "\n",
    "utf8",
  );
  return { dir, statePath, dataRoot: join(dir, "data"), seriesRoot };
}

describe("editions CLI — register upsert/list/complete round-trip (N12 AC)", () => {
  test("upsert -> list -> complete round-trips through a real register in a scratch data dir", () => {
    const { dir, statePath, dataRoot, seriesRoot } = fixture();
    try {
      // 1. a phase transition mirrors the edition into the register
      const up = run(
        ["register-upsert", "--edition-state", statePath, "--next", "Step 3a — spine prose", "--at", T1],
        dataRoot,
      );
      assert.equal(up.status, 0, up.stderr);

      const registerPath = join(dataRoot, "editions", "register.json");
      assert.ok(existsSync(registerPath), "register-upsert must create the register under ${DATA}/editions/");

      // 2. list surfaces it without opening a single edition-state.json
      const listed = run(["register-list", "--json"], dataRoot);
      assert.equal(listed.status, 0, listed.stderr);
      const rows = JSON.parse(listed.stdout);
      assert.equal(rows.length, 1);
      assert.equal(rows[0].series, "seres");
      assert.equal(rows[0].editionId, "05");
      assert.equal(rows[0].title, "Da pipelinen brøt sammen");
      assert.equal(rows[0].currentPhase, "skeleton-pitch");
      assert.equal(rows[0].nextAction, "Step 3a — spine prose");
      assert.equal(rows[0].path, seriesRoot, "the series root is derived from the state-file path");
      assert.equal(rows[0].startedAt, T1);
      assert.equal(rows[0].status, "active");

      // 3. complete closes the row and takes it out of the in-flight view
      const done = run(["register-complete", "--series", "seres", "--edition", "05", "--at", T2], dataRoot);
      assert.equal(done.status, 0, done.stderr);
      assert.equal(JSON.parse(run(["register-list", "--json"], dataRoot).stdout).length, 0);

      const all = JSON.parse(run(["register-list", "--json", "--all"], dataRoot).stdout);
      assert.equal(all.length, 1);
      assert.equal(all[0].status, "complete");
      assert.equal(all[0].completedAt, T2);
    } finally {
      rmSync(dir, { recursive: true, force: true });
    }
  });

  test("the same upsert also appends the phaseLog entry — telemetry is not a separate step", () => {
    const { dir, statePath, dataRoot } = fixture();
    try {
      assert.equal(run(["register-upsert", "--edition-state", statePath, "--at", T1], dataRoot).status, 0);
      const state = JSON.parse(readFileSync(statePath, "utf8"));
      assert.deepEqual(state.articles["05"].phaseLog, [{ phase: "skeleton-pitch", completedAt: T1 }]);
    } finally {
      rmSync(dir, { recursive: true, force: true });
    }
  });

  test("a repeated transition is idempotent in both the log and the register", () => {
    const { dir, statePath, dataRoot } = fixture();
    try {
      run(["register-upsert", "--edition-state", statePath, "--at", T1], dataRoot);
      run(["register-upsert", "--edition-state", statePath, "--at", T2], dataRoot);
      const state = JSON.parse(readFileSync(statePath, "utf8"));
      assert.equal(state.articles["05"].phaseLog.length, 1);
      const rows = JSON.parse(run(["register-list", "--json"], dataRoot).stdout);
      assert.equal(rows.length, 1);
      assert.equal(rows[0].startedAt, T1, "lead time is anchored at the first transition");
      assert.equal(rows[0].updatedAt, T2);
    } finally {
      rmSync(dir, { recursive: true, force: true });
    }
  });

  test("the human view shows phase, next action and days in flight — the WIP answer without opening files", () => {
    const { dir, statePath, dataRoot } = fixture();
    try {
      run(["register-upsert", "--edition-state", statePath, "--next", "Step 3a — spine prose", "--at", T1], dataRoot);
      const out = run(["register-list", "--now", T2], dataRoot);
      assert.equal(out.status, 0, out.stderr);
      assert.match(out.stdout, /seres/);
      assert.match(out.stdout, /05/);
      assert.match(out.stdout, /skeleton-pitch/);
      assert.match(out.stdout, /Step 3a — spine prose/);
      assert.match(out.stdout, /3(\.0)? day/, "days in flight is the lead-time signal (T1 -> T2 = 3 days)");
    } finally {
      rmSync(dir, { recursive: true, force: true });
    }
  });

  test("an empty register says so plainly instead of printing nothing", () => {
    const { dir, dataRoot } = fixture();
    try {
      const out = run(["register-list"], dataRoot);
      assert.equal(out.status, 0, out.stderr);
      assert.match(out.stdout, /no editions in flight/i);
    } finally {
      rmSync(dir, { recursive: true, force: true });
    }
  });

  test("--register overrides the data-dir default", () => {
    const { dir, statePath, dataRoot } = fixture();
    try {
      const elsewhere = join(dir, "elsewhere", "register.json");
      assert.equal(
        run(["register-upsert", "--edition-state", statePath, "--register", elsewhere, "--at", T1], dataRoot).status,
        0,
      );
      assert.ok(existsSync(elsewhere));
      assert.ok(!existsSync(join(dataRoot, "editions", "register.json")));
    } finally {
      rmSync(dir, { recursive: true, force: true });
    }
  });

  test("register-upsert without --edition-state is a usage error (exit 2)", () => {
    const { dir, dataRoot } = fixture();
    try {
      const out = run(["register-upsert", "--next", "Step 3a"], dataRoot);
      assert.equal(out.status, 2);
      assert.match(out.stderr, /--edition-state/);
    } finally {
      rmSync(dir, { recursive: true, force: true });
    }
  });

  test("register-complete on an unknown edition fails loudly instead of silently succeeding", () => {
    const { dir, statePath, dataRoot } = fixture();
    try {
      run(["register-upsert", "--edition-state", statePath, "--at", T1], dataRoot);
      const out = run(["register-complete", "--series", "seres", "--edition", "99", "--at", T2], dataRoot);
      assert.notEqual(out.status, 0);
      assert.match(out.stderr, /99/);
    } finally {
      rmSync(dir, { recursive: true, force: true });
    }
  });

  test("a malformed edition-state is refused at the edge, not mirrored", () => {
    const { dir, statePath, dataRoot } = fixture();
    try {
      writeFileSync(statePath, JSON.stringify({ schemaVersion: 1, series: { slug: "seres" } }), "utf8");
      const out = run(["register-upsert", "--edition-state", statePath, "--at", T1], dataRoot);
      assert.equal(out.status, 2);
      assert.match(out.stderr, /currentArticle/);
    } finally {
      rmSync(dir, { recursive: true, force: true });
    }
  });
});