import assert from 'node:assert/strict';
import test from 'node:test';

import type { DailyRollup, OverviewData, SessionSummary, StreakCalendarDay, VocabularyEntry } from '../types/stats';
import {
  buildOverviewSummary,
  buildStreakCalendar,
  buildTrendDashboard,
  buildVocabularySummary,
} from './dashboard-data';

test('buildOverviewSummary aggregates tracked totals and recent windows', () => {
  const now = Date.UTC(2026, 2, 13, 12);
  const today = Math.floor(now / 86_400_000);
  const sessions: SessionSummary[] = [
    {
      sessionId: 1,
      canonicalTitle: 'A',
      videoId: 1,
      animeId: null,
      animeTitle: null,
      startedAtMs: now - 3_600_000,
      endedAtMs: now - 1_800_000,
      totalWatchedMs: 3_600_000,
      activeWatchedMs: 3_000_000,
      linesSeen: 20,
      wordsSeen: 100,
      tokensSeen: 80,
      cardsMined: 2,
      lookupCount: 10,
      lookupHits: 8,
    },
  ];
  const rollups: DailyRollup[] = [
    {
      rollupDayOrMonth: today,
      videoId: 1,
      totalSessions: 1,
      totalActiveMin: 50,
      totalLinesSeen: 20,
      totalWordsSeen: 100,
      totalTokensSeen: 80,
      totalCards: 2,
      cardsPerHour: 2.4,
      wordsPerMin: 2,
      lookupHitRate: 0.8,
    },
  ];
  const overview: OverviewData = {
    sessions,
    rollups,
    hints: { totalSessions: 1, activeSessions: 0, episodesToday: 2, activeAnimeCount: 3 },
  };

  const summary = buildOverviewSummary(overview, now);
  assert.equal(summary.todayCards, 2);
  assert.equal(summary.totalTrackedCards, 2);
  assert.equal(summary.episodesToday, 2);
  assert.equal(summary.activeAnimeCount, 3);
  assert.equal(summary.averageSessionMinutes, 50);
});

test('buildVocabularySummary treats firstSeen timestamps as seconds', () => {
  const now = Date.UTC(2026, 2, 13, 12);
  const nowSec = now / 1000;
  const words: VocabularyEntry[] = [
    {
      wordId: 1,
      headword: '猫',
      word: '猫',
      reading: 'ねこ',
      partOfSpeech: null,
      pos1: null,
      pos2: null,
      pos3: null,
      frequency: 4,
      firstSeen: nowSec - 2 * 86_400,
      lastSeen: nowSec - 1,
    },
  ];

  const summary = buildVocabularySummary(words, [], now);
  assert.equal(summary.newThisWeek, 1);
});

test('buildTrendDashboard derives dense chart series', () => {
  const now = Date.UTC(2026, 2, 13, 12);
  const today = Math.floor(now / 86_400_000);
  const rollups: DailyRollup[] = [
    {
      rollupDayOrMonth: today - 1,
      videoId: 1,
      totalSessions: 2,
      totalActiveMin: 60,
      totalLinesSeen: 30,
      totalWordsSeen: 120,
      totalTokensSeen: 100,
      totalCards: 3,
      cardsPerHour: 3,
      wordsPerMin: 2,
      lookupHitRate: 0.5,
    },
    {
      rollupDayOrMonth: today,
      videoId: 1,
      totalSessions: 1,
      totalActiveMin: 30,
      totalLinesSeen: 10,
      totalWordsSeen: 40,
      totalTokensSeen: 30,
      totalCards: 1,
      cardsPerHour: 2,
      wordsPerMin: 1.33,
      lookupHitRate: 0.75,
    },
  ];

  const dashboard = buildTrendDashboard(rollups);
  assert.equal(dashboard.watchTime.length, 2);
  assert.equal(dashboard.words[1]?.value, 40);
  assert.equal(dashboard.sessions[0]?.value, 2);
});

test('buildStreakCalendar converts epoch days to YYYY-MM-DD dates', () => {
  const days: StreakCalendarDay[] = [
    { epochDay: 20525, totalActiveMin: 45 },
    { epochDay: 20526, totalActiveMin: 0 },
    { epochDay: 20527, totalActiveMin: 30 },
  ];

  const points = buildStreakCalendar(days);
  assert.equal(points.length, 3);
  assert.match(points[0]!.date, /^\d{4}-\d{2}-\d{2}$/);
  assert.equal(points[0]!.value, 45);
  assert.equal(points[1]!.value, 0);
  assert.equal(points[2]!.value, 30);
});