import test from "node:test";
import assert from "node:assert/strict";
import { readFileSync } from "node:fs";
import { parseDocx } from "../server/parser.js";
import { parseWeeksDocx, parseBellsDocx } from "../server/calendar.js";
import { mergeWeekTables } from "../server/source.js";
import { timetable } from "../server/timetable.js";

const fixture = (name) =>
  readFileSync(new URL(`./fixtures/${name}.docx`, import.meta.url));
const calendar = {
  ...mergeWeekTables([parseWeeksDocx(fixture("weeks"))]),
  bells: parseBellsDocx(fixture("bells")),
  source: {},
};
const schedule = parseDocx(fixture("fef-23-ba"), { name: "23-ЛГ_23-БА.docx" });
const file = { id: "fef", name: "23-ЛГ_23-БА.docx", faculty: "ФЭФ", course: "4 курс" };

test("Расписание группы по датам: недели, пары, подгруппы, пустые выходные", () => {
  const t = timetable({ file, schedule, calendar, group: "23-БА", from: "2026-10-16", days: 3 });
  assert.equal(t.semester.label, "Осенний семестр 2026/27");
  assert.deepEqual(t.days.map((d) => [d.date, d.weekday, d.week.n, d.week.color]), [
    ["2026-10-16", 5, 7, "white"],
    ["2026-10-17", 6, 7, "white"],
    ["2026-10-18", 7, 7, "white"],
  ]);
  // Friday of week 7: "12-15н." and "16н." lessons are not on this date.
  assert.deepEqual(
    t.days[0].lessons.map((l) => [l.start, l.pair, l.subject]),
    [
      ["08:30", 1, "Инновационный менеджмент"],
      ["10:05", 2, "PR-менеджмент"],
      ["11:45", 3, "Бизнес-анализ"],
    ],
  );
  assert.equal(t.days[1].lessons.length, 0);
  assert.ok(t.weekly.length >= 5, "строки Word по дням недели доступны всегда");
  const lg = timetable({ file, schedule, calendar, group: "23-ЛГ", from: "2026-10-12", days: 7 });
  assert.deepEqual(lg.subgroups, ["Подгруппа 1", "Подгруппа 2"]);
  assert.ok(lg.days.flatMap((d) => d.lessons).some((l) => l.subgroup === "Подгруппа 2"));
});

test("Без семестра в таблице недель даты не угадываются", () => {
  const spring = { ...schedule, period: "Весенний семестр" };
  const t = timetable({ file, schedule: spring, calendar, group: "23-БА", from: "2027-03-01", days: 7 });
  assert.equal(t.semester, null);
  assert.ok(t.note);
  assert.ok(t.days.every((d) => d.lessons.length === 0 && d.week === null));
  assert.throws(
    () => timetable({ file, schedule, calendar, group: "99-ХХ", from: "2026-10-16", days: 1 }),
    /нет группы/,
  );
});

test("range=semester: все дни текущего семестра от первого до последнего", () => {
  const t = timetable({ file, schedule, calendar, group: "23-БА", from: "2026-10-16", range: "semester", today: "2026-10-16" });
  assert.equal(t.days[0].date, t.semester.start);
  assert.equal(t.days.at(-1).date, t.semester.end);
  assert.ok(t.days.length > 62, "больше обычного предела в 62 дня");
});

test("Сессия с датами в Word не зависит от таблицы недель", () => {
  // June 2026 lies outside the 2026/27 week table, yet every lesson has its own date.
  const session = parseDocx(fixture("itzs-summer-2026"), { name: "23-ИТзс.docx" });
  const t = timetable({
    file: { id: "itzs", name: "23-ИТзс.docx" },
    schedule: session,
    calendar,
    group: "23-ИТзс",
    from: "2026-10-19",
    range: "semester",
    today: "2026-10-19",
  });
  assert.deepEqual(t.semester, {
    id: "session-2026-06-08",
    label: "Лабораторно-экзаменационная сессия",
    start: "2026-06-08",
    end: "2026-06-27",
  });
  assert.equal(t.note, null);
  assert.equal(t.days.length, 20);
  assert.equal(t.days.reduce((n, d) => n + d.lessons.length, 0), 58);
  const exam = t.days.find((d) => d.date === "2026-06-18").lessons.find((l) => l.type === "Экзамен");
  assert.deepEqual([exam.start, exam.end, exam.pair], ["08:30", "09:55", 1]);
});