// Case 2 M7/M8 (design 5.1, row 220): loadSeatSets reads every business file in
// the config directory. A seat is a library seat when a business with a library
// project names it; a creative seat is a library seat whose definition is creative.
// Any file it can't read or validate throws, and so does a businesses path that is
// not a directory. An absent businesses directory gives empty sets.
import { test } from "node:test";
import assert from "node:assert/strict";
import { mkdirSync, mkdtempSync, rmSync, symlinkSync, writeFileSync, chmodSync } from "node:fs";
import { tmpdir } from "node:os";
import { join } from "node:path";
import { loadSeatSets } from "../src/library-seats.mjs";
import { BusinessError } from "../src/index.mjs";
import { businessDoc, writeJson, REPO_ROLES } from "./helpers.mjs";
import { mappingEntry } from "../../library/tests/helpers.mjs";

function fixture(t) {
  const root = mkdtempSync(join(tmpdir(), "row220-seats-"));
  t.after(() => rmSync(root, { recursive: true, force: true }));
  const dir = join(root, "config");
  mkdirSync(join(dir, "businesses"), { recursive: true });
  return { root, dir };
}

const sets = (dir) => loadSeatSets({ dir, rolesDir: REPO_ROLES });

test("M7/M8: library seats come from library businesses, creative seats from their creative definitions", (t) => {
  const { root, dir } = fixture(t);
  const doc = businessDoc(root, "acme");
  doc.projects = { books: mappingEntry(), ...doc.projects };
  doc.roles.chief.credentials = { gitea: { ...doc.roles.coder.credentials.gitea } };
  doc.roles.bean = { definition: "companion" };
  doc.roles.bean.credentials = { gitea: { ...doc.roles.coder.credentials.gitea } };
  writeJson(join(dir, "businesses", "acme.json"), doc);
  const found = sets(dir);
  assert.deepEqual([...found.librarySeats].sort(), ["bean", "chief", "coder", "cto", "pm", "reviewer"]);
  assert.deepEqual([...found.creativeSeats], ["bean"]);
  assert.ok([...found.creativeSeats].every((seat) => found.librarySeats.has(seat)));
});

test("M8: a business with no library project puts no seat in either set", (t) => {
  const { root, dir } = fixture(t);
  const doc = businessDoc(root, "other");
  doc.roles.bean = { definition: "companion" };
  doc.roles.bean.credentials = { gitea: { ...doc.roles.coder.credentials.gitea } };
  writeJson(join(dir, "businesses", "other.json"), doc);
  const found = sets(dir);
  assert.equal(found.librarySeats.size, 0);
  assert.equal(found.creativeSeats.size, 0);
});

test("M7/M8: a business file that is not valid JSON throws; no empty set", (t) => {
  const { root, dir } = fixture(t);
  writeJson(join(dir, "businesses", "acme.json"), businessDoc(root, "acme"));
  const broken = join(dir, "businesses", "broken.json");
  writeFileSync(broken, "{");
  chmodSync(broken, 0o600);
  assert.throws(() => sets(dir), BusinessError);
});

test("M7/M8: an absent businesses directory gives empty sets", (t) => {
  const root = mkdtempSync(join(tmpdir(), "row220-seats-none-"));
  t.after(() => rmSync(root, { recursive: true, force: true }));
  const found = sets(join(root, "config"));
  assert.equal(found.librarySeats.size, 0);
  assert.equal(found.creativeSeats.size, 0);
});

test("M7/M8: a businesses path that is not a directory throws; no empty set", (t) => {
  const root = mkdtempSync(join(tmpdir(), "row220-seats-file-"));
  t.after(() => rmSync(root, { recursive: true, force: true }));
  const dir = join(root, "config");
  mkdirSync(dir);
  writeFileSync(join(dir, "businesses"), "not a directory");
  assert.throws(() => sets(dir), (err) => err instanceof BusinessError && /cannot list businesses/.test(err.message));
});

test("M7/M8: a businesses symlink to a missing target throws; no empty set", (t) => {
  const root = mkdtempSync(join(tmpdir(), "row220-seats-dangling-"));
  t.after(() => rmSync(root, { recursive: true, force: true }));
  const dir = join(root, "config");
  mkdirSync(dir);
  symlinkSync(join(root, "missing"), join(dir, "businesses"));
  assert.throws(() => sets(dir), (err) => err instanceof BusinessError && /cannot list businesses/.test(err.message));
});

test("M7/M8: a config directory under a regular file throws (lstat fails with ENOTDIR); no empty set", (t) => {
  const root = mkdtempSync(join(tmpdir(), "row220-seats-notdir-"));
  t.after(() => rmSync(root, { recursive: true, force: true }));
  const dir = join(root, "config");
  writeFileSync(dir, "not a directory");
  assert.throws(() => sets(dir), (err) => err instanceof BusinessError && /cannot list businesses/.test(err.message));
});

test("M7/M8: a business file that can't be read throws; no empty set", (t) => {
  const { root, dir } = fixture(t);
  writeJson(join(dir, "businesses", "acme.json"), businessDoc(root, "acme"));
  const file = join(dir, "businesses", "acme.json");
  chmodSync(file, 0o000);
  t.after(() => {
    // The fixture's rmSync hook can run first, so the file may already be gone.
    try {
      chmodSync(file, 0o600);
    } catch (err) {
      if (err.code !== "ENOENT") throw err;
    }
  });
  // Root reads a mode 000 file, so the check cannot hold there.
  if (process.getuid?.() === 0) return t.skip("running as root: mode 000 files stay readable");
  assert.throws(() => sets(dir), (err) => err instanceof BusinessError && /must be a regular, non-symbolic-link file/.test(err.message));
});