import { readFileSync } from 'node:fs';
import { resolve } from 'node:path';
import { mount } from '@vue/test-utils';
import { describe, expect, it } from 'vitest';
import { defineComponent, h, nextTick, shallowRef } from 'vue';
import { useRouteLog } from '@/composables/useRouteLog';
import { maintenanceProgress } from '@/journey/maintenance-progress';
import {
  createRewindLatch,
  fitCaption,
  milestoneIndex,
  milestonesFor,
  parseDates,
  passPoint,
  ROUTE_LOG_BUDGET,
  routeLogSubline,
  sectionLocalProgress,
} from '@/journey/route-log';
import type { JourneySnapshot } from '@/journey/types';
import type { PortfolioContent, SectionId } from '@/content/types';

const content = JSON.parse(
  readFileSync(resolve(process.cwd(), 'content/public/portfolio-content.json'), 'utf8'),
) as PortfolioContent;

const at = (activeSectionId: SectionId, active: number, next: number | null) => ({
  activeSectionId,
  sectionActivation: { layoutRevision: 1, activeHeadingOffsetVh: active, nextHeadingOffsetVh: next },
});

describe('section-local progress', () => {
  it('runs 0..1 between the chapter heading and the next, null elsewhere', () => {
    expect(sectionLocalProgress(at('experience', 0, 2), 'experience')).toBe(0);
    expect(sectionLocalProgress(at('experience', -1, 1), 'experience')).toBeCloseTo(0.5);
    expect(sectionLocalProgress(at('experience', -3, -1), 'experience')).toBe(1);
    expect(sectionLocalProgress(at('experience', -1, 1), 'profile')).toBeNull();
    expect(sectionLocalProgress(at('profile', 0, null), 'profile')).toBeNull();
    expect(sectionLocalProgress(at('profile', 1, 1), 'profile')).toBeNull();
    expect(sectionLocalProgress(at('profile', Number.NaN, 1), 'profile')).toBeNull();
  });

  it('still backs the 03:12 window', () => {
    expect(maintenanceProgress(at('infrastructure', -1, 1))).toBeCloseTo(0.5);
    expect(maintenanceProgress(at('experience', -1, 1))).toBeNull();
  });
});

describe('milestones from the real content', () => {
  it('lists three roles and the systems plate for Experience', () => {
    const items = milestonesFor(content, 'experience');
    expect(items).toHaveLength(4);
    expect(items.map((item) => item.index)).toEqual([0, 1, 2, 3]);
    expect(items[0]).toMatchObject({ dateLabel: 'AUG 2025 → PRESENT', compactDate: '2025→PRESENT', caption: 'TRUPA LUI RĂZUȘ' });
    expect(items[1]).toMatchObject({ dateLabel: 'JUN 2025 → AUG 2025', compactDate: 'JUN→AUG 2025' });
    expect(items[2]).toMatchObject({ dateLabel: 'JUN 2025 → AUG 2025', caption: 'ISENSE SOLUTIONS' });
    expect(items[3]).toMatchObject({ dateLabel: '', caption: 'SYSTEMS OPERATIONS' });
  });

  it('lists the three screening facts for Profile', () => {
    const items = milestonesFor(content, 'profile');
    expect(items.map((item) => item.caption)).toEqual(['EDUCATION', 'LANGUAGES', 'CERTIFICATIONS']);
    expect(items.map((item) => item.dateLabel)).toEqual(['2023 → 2026', '', '2022 · 2025']);
  });

  it('has no posts in other chapters', () => {
    expect(milestonesFor(content, 'toolkit')).toEqual([]);
    expect(routeLogSubline(0.5, milestonesFor(content, 'toolkit'))).toBeNull();
    expect(routeLogSubline(0.5, milestonesFor(content, 'experience').slice(0, 1))).toBeNull();
  });

  it('parses spans, open spans and year lists', () => {
    expect(parseDates('Jan 2024 - Present')).toEqual({ dateLabel: 'JAN 2024 → PRESENT', compactDate: '2024→PRESENT' });
    expect(parseDates('2019–2021')).toEqual({ dateLabel: '2019 → 2021', compactDate: '2019→2021' });
    expect(parseDates('Remote')).toEqual({ dateLabel: '', compactDate: '' });
  });
});

describe('the ROUTE LOG sub-line', () => {
  const experience = milestonesFor(content, 'experience');
  const profile = milestonesFor(content, 'profile');

  it('steps through the posts at the middle of each share', () => {
    expect(passPoint(0, 4)).toBe(0.125);
    expect(passPoint(3, 4)).toBe(0.875);
    expect(milestoneIndex(0, 4)).toBe(0);
    expect(milestoneIndex(0.26, 4)).toBe(1);
    expect(milestoneIndex(1, 4)).toBe(3);
    expect(routeLogSubline(0.3, experience)).toBe('LOG 02/04 · JUN 2025 → AUG 2025 · CCF');
    expect(routeLogSubline(0.6, experience)).toBe('LOG 03/04 · JUN 2025 → AUG 2025 · ISENSE SOLUTIONS');
    expect(routeLogSubline(0.95, experience)).toBe('LOG 04/04 · SYSTEMS OPERATIONS');
    expect(routeLogSubline(0.4, profile)).toBe('LOG 02/03 · LANGUAGES');
    expect(routeLogSubline(0.1, profile)).toBe('LOG 01/03 · 2023 → 2026 · EDUCATION');
  });

  it('adds REWIND while scrolling back', () => {
    expect(routeLogSubline(0.6, experience, true)).toMatch(/^LOG 03\/04 · JUN 2025 → AUG 2025 · .+ · REWIND$/u);
    // A narrow plate rewinding has no room for the date: the index and caption stay.
    expect(routeLogSubline(0.1, experience, true, 'compact')).toBe('LOG 01/04 · TLR · REWIND');
  });

  it('fits the narrow plates (phones) in the budget, shortening the organisation', () => {
    for (const items of [experience, profile]) {
      for (let p = 0; p <= 1; p += 0.05) {
        for (const reversing of [false, true]) {
          expect(routeLogSubline(p, items, reversing, 'compact')!.length).toBeLessThanOrEqual(ROUTE_LOG_BUDGET.compact);
          expect(routeLogSubline(p, items, reversing, 'wide')!.length).toBeLessThanOrEqual(ROUTE_LOG_BUDGET.wide);
        }
      }
    }
    expect(routeLogSubline(0.1, experience, false, 'compact')).toBe('LOG 01/04 · 2025→PRESENT · TLR');
    // Only 'IS' would fit after the date, so the caption takes the date's place.
    expect(routeLogSubline(0.6, experience, false, 'compact')).toBe('LOG 03/04 · ISENSE SOLUTIONS');
    expect(fitCaption('CAMERA CONSULTANȚILOR FISCALI', 10)).toBe('CCF');
    expect(fitCaption('ISENSE SOLUTIONS', 2)).toBe('IS');
    expect(fitCaption('CERTIFICATIONS', 4)).toBe('');
  });

  it('latches a rewind while progress falls, per chapter', () => {
    const latch = createRewindLatch();
    expect(latch(0.2, 'experience')).toBe(false);
    expect(latch(0.4, 'experience')).toBe(false);
    expect(latch(0.3, 'experience')).toBe(true);
    expect(latch(0.3005, 'experience')).toBe(true);
    expect(latch(0.5, 'experience')).toBe(false);
    // Profile ends at 1 and Experience starts at 0: a new chapter is not a rewind.
    expect(latch(1, 'profile')).toBe(false);
    expect(latch(0, 'experience')).toBe(false);
    expect(latch(0.1, 'experience')).toBe(false);
    expect(latch(null)).toBe(false);
  });
});

describe('useRouteLog', () => {
  const snapshot = (activeSectionId: SectionId, a: number, n: number | null): JourneySnapshot => ({
    scrollY: 0,
    routeProgress: 0.3,
    direction: 0,
    acceleration: 0,
    driveSpeed: 0,
    activeSectionId,
    chapter: 'systems',
    sign: null,
    arrived: false,
    sectionActivation: { layoutRevision: 1, activeHeadingOffsetVh: a, nextHeadingOffsetVh: n },
  });

  it('sets html[data-route-log] and the sub-line only in its chapters, then cleans up', async () => {
    const journey = shallowRef(snapshot('start', -1, 1));
    let subline = shallowRef('');
    const wrapper = mount(defineComponent({
      setup() {
        subline = useRouteLog(journey, () => content) as typeof subline;
        return () => h('span', subline.value);
      },
    }));
    const root = document.documentElement;
    await nextTick();
    expect(root.dataset.routeLog).toBeUndefined();
    expect(subline.value).toBe('');

    journey.value = snapshot('experience', -0.2, 1.8);
    await nextTick();
    expect(root.dataset.routeLog).toBe('1/4');
    expect(subline.value).toMatch(/^LOG 01\/04 · /u);

    journey.value = snapshot('experience', -1.2, 0.8);
    await nextTick();
    expect(root.dataset.routeLog).toBe('3/4');
    expect(subline.value).not.toMatch(/REWIND/u);

    journey.value = snapshot('experience', -0.8, 1.2);
    await nextTick();
    expect(root.dataset.routeLog).toBe('2/4');
    expect(subline.value).toMatch(/^LOG 02\/04 · .* · REWIND$/u);

    journey.value = snapshot('infrastructure', -0.5, 1.5);
    await nextTick();
    expect(root.dataset.routeLog).toBeUndefined();
    expect(subline.value).toBe('');

    journey.value = snapshot('profile', -1, 1);
    await nextTick();
    expect(root.dataset.routeLog).toBe('2/3');
    wrapper.unmount();
    expect(root.dataset.routeLog).toBeUndefined();
  });
});