// Entry point: wires the engine, the services (cookies, i18n, themes) and the UI.

import { abandonContract, acceptContract, claimEvent } from './engine/contracts.js';
import {
  advance,
  buyGenerator,
  buyMarketing,
  buyMaterial,
  buyUpgrade,
  click,
  derive,
  setPrice,
  simulateOffline,
} from './engine/engine.js';
import { buyEndless } from './engine/endless.js';
import { buyChip, buyReliability, gamble } from './engine/gamble.js';
import { buyShares, sellShares } from './engine/investments.js';
import { buyPerk, prestige } from './engine/legacy.js';
import { buyLab, buyResearch } from './engine/research.js';
import { createState, sanitizeState, serializeState } from './engine/state.js';
import { fetchLocales, fetchThemes, loadGameContext } from './services/data.js';
import { createFormatter } from './services/format.js';
import { applyTranslations, fetchThemeName, FALLBACK_LOCALE, loadDictionary, t } from './services/i18n.js';
import { buildExport, parseImport } from './services/saveio.js';
import {
  cookiesAvailable,
  deleteGame,
  loadGameText,
  loadPrefs,
  saveGameText,
  savePrefs,
  takeLegacySaves,
} from './services/storage.js';
import { applyThemeStyles } from './services/themes.js';
import { createAchievementsView } from './ui/achievementsView.js';
import { createContractsView } from './ui/contractsView.js';
import { $, refreshStaticIcons, setThemeAssets } from './ui/dom.js';
import { createEndlessView } from './ui/endlessView.js';
import { createGambleView } from './ui/gambleView.js';
import { createInvestView } from './ui/investView.js';
import { createLegacyView } from './ui/legacyView.js';
import { createResearchView } from './ui/researchView.js';
import { createSettings } from './ui/settings.js';
import { createTabs } from './ui/tabs.js';
import { formatDuration, moneyFormatter, rewardText } from './ui/text.js';
import { showToast } from './ui/toast.js';
import { createView } from './ui/view.js';

const TICK_MS = 100;
const INCOME_SMOOTHING_SECONDS = 3;
const SAVE_ERROR_COOLDOWN_MS = 60_000;

let ctx;
let themes = [];
let locales = [];
let themeId;
let locale;
let state;
let fmt;
let tabs;
let income = 0;
let lastSaveError = 0;
const themeNames = new Map();

// ------------------------------------------------------------------ saving

function persist() {
  if (!state) return;
  state.savedAt = Date.now();
  try {
    saveGameText(serializeState(state));
  } catch {
    if (Date.now() - lastSaveError > SAVE_ERROR_COOLDOWN_MS) {
      lastSaveError = Date.now();
      showToast(t('toast.saveFailed'), { error: true });
    }
  }
}

function parseSaved(text) {
  try {
    return sanitizeState(JSON.parse(text), ctx);
  } catch {
    return null;
  }
}

/**
 * The shared game from cookies. Falls back to the per-theme saves of the first
 * version: the most advanced one becomes the shared game, the others are dropped.
 */
function loadSavedState() {
  const text = loadGameText();
  if (text) return parseSaved(text);

  const legacy = takeLegacySaves(themes.map((th) => th.id)).map(parseSaved).filter(Boolean);
  legacy.sort((a, b) => b.totalProduced - a.totalProduced);
  return legacy[0] ?? null;
}

function persistPrefs() {
  savePrefs({ theme: themeId, lang: locale });
}

// ------------------------------------------------------------ theme / language

function pickLocale(preferred) {
  const codes = locales.map((l) => l.code);
  if (codes.includes(preferred)) return preferred;
  for (const tag of navigator.languages ?? [navigator.language]) {
    const match = codes.find((code) => code === tag || code === tag?.split('-')[0]);
    if (match) return match;
  }
  return FALLBACK_LOCALE;
}

async function themeLabel(id) {
  const key = `${id}:${locale}`;
  if (!themeNames.has(key)) themeNames.set(key, await fetchThemeName(id, locale));
  return themeNames.get(key);
}

async function fillSelects() {
  const themeSelect = $('#theme-select');
  const labels = await Promise.all(themes.map((th) => themeLabel(th.id)));
  themeSelect.replaceChildren(
    ...themes.map((th, i) => new Option(labels[i], th.id, false, th.id === themeId)),
  );
  $('#locale-select').replaceChildren(
    ...locales.map((l) => new Option(l.name, l.code, false, l.code === locale)),
  );
}

/** Reload texts, assets and every screen for the current theme + language. */
async function refreshTexts() {
  await loadDictionary(locale, themeId);
  fmt = createFormatter(locale);
  setThemeAssets(themeId, themes.find((th) => th.id === themeId)?.assets);
  applyTranslations();
  document.title = t('theme.title');
  view.rebuild(ctx, fmt);
  endless.rebuild(ctx, fmt);
  for (const screen of Object.values(screens)) screen.rebuild(ctx, fmt);
  tabs.rebuild();
  refreshStaticIcons();
  await fillSelects();
}

/** Change the skin only: the game state is shared by every theme. */
async function setTheme(id) {
  themeId = id;
  await applyThemeStyles(id);
  await refreshTexts();
  persistPrefs();
  if (state) render();
}

// ------------------------------------------------------------------ the loop

/** Tell the player about what just happened (see `notices` in engine.advance). */
function announce(notice) {
  switch (notice.kind) {
    case 'contract_done':
      showToast(t('toast.contractDone', { reward: rewardText(notice.reward, fmt, notice.seconds) }));
      break;
    case 'contract_failed':
      showToast(t('toast.contractFailed'), { error: true });
      break;
    case 'event_incident':
      showToast(t('toast.eventIncident', { title: t(`event.${notice.type}.title`) }), { error: true });
      break;
    case 'achievement':
      showToast(t('toast.achievement', { title: t(`ach.title.${notice.id}`) }));
      break;
    default:
  }
}

/** Apply progress made while the game was closed or the device asleep. */
function catchUp(elapsedSeconds) {
  const report = simulateOffline(state, ctx, elapsedSeconds);
  if (!report || (report.produced <= 0 && report.revenue <= 0)) return;
  showToast(
    t('toast.welcomeBack', {
      duration: formatDuration(report.seconds),
      produced: fmt.number(Math.floor(report.produced)),
      funds: moneyFormatter(fmt)(report.revenue),
    }),
  );
}

/** Tell the player when an older save had to be rebalanced (see repairOlderSave in state.js). */
function reportRepair() {
  if (!state.repaired) return;
  state.repaired = false;
  showToast(t('toast.repaired'), { sticky: true });
}

let lastFrame = Date.now();

function frame() {
  const now = Date.now();
  const dt = (now - lastFrame) / 1000;
  lastFrame = now;
  if (!state || dt <= 0) return;

  if (dt >= ctx.rules.offline.minSeconds) {
    catchUp(dt); // tab was frozen or the device slept
  } else {
    const totals = advance(state, ctx, dt);
    income += (totals.revenue / dt - income) * Math.min(1, dt / INCOME_SMOOTHING_SECONDS);
    totals.notices.forEach(announce);
  }
  render();
}

/** The resource bar and the unlocked tabs always; the open section only. */
function render() {
  const d = derive(state, ctx);
  view.update(state, d, { income });
  tabs.update(state);
  if (tabs.active === 'main') endless.update(state);
  else screens[tabs.active]?.update(state, d);
}

// ------------------------------------------------------------------- actions

/** Wrap an engine action: run it on the current state, refresh the screen, report if it happened. */
const act = (fn) => (...args) => {
  const done = fn(state, ctx, ...args);
  render();
  return done;
};

const view = createView({
  make: act(click),
  buyMaterial: act(buyMaterial),
  buyMarketing: act(buyMarketing),
  buyGenerator: act(buyGenerator),
  buyUpgrade: act(buyUpgrade),
  setPrice: act(setPrice),
  nudgePrice: (delta) => act(setPrice)(state.price + delta),
});

const endless = createEndlessView($('#endless'), { buy: act(buyEndless) });

function restart() {
  if (!confirm(t('legacy.confirm'))) return;
  const gain = prestige(state, ctx);
  if (!gain) return;
  income = 0;
  persist();
  tabs.select('main');
  showToast(t('toast.restarted', { gain: fmt.number(gain) }));
}

/** One screen per section; each is built and refreshed by its own module. */
const screens = {
  contracts: createContractsView($('#view-contracts'), {
    accept: act(acceptContract),
    abandon: act(abandonContract),
    claimEvent: () => {
      claimEvent(state, ctx, derive(state, ctx));
      render();
    },
  }),
  invest: createInvestView($('#view-invest'), { buy: act(buyShares), sell: act(sellShares) }),
  research: createResearchView($('#view-research'), { buyLab: act(buyLab), buyNode: act(buyResearch) }),
  gamble: createGambleView($('#view-gamble'), {
    buyChip: act(buyChip),
    buyReliability: act(buyReliability),
    run(stake) {
      const result = gamble(state, ctx, stake, derive(state, ctx).mods);
      render();
      return result;
    },
  }),
  legacy: createLegacyView($('#view-legacy'), { buyPerk: act(buyPerk), restart }),
  achievements: createAchievementsView($('#view-achievements')),
};

createSettings({
  getExport: () => ({
    text: buildExport(state),
    name: `idle-clicker-${new Date().toISOString().slice(0, 10)}`,
  }),
  importText(text) {
    state = parseImport(text, ctx); // throws before anything changes
    reportRepair();
    income = 0;
    persist();
    render();
  },
  reset() {
    deleteGame();
    state = createState(ctx);
    income = 0;
    persist();
    tabs.select('main');
    render();
  },
});

// ---------------------------------------------------------------------- boot

function showFatal(error) {
  console.error(error);
  document.body.replaceChildren(Object.assign(document.createElement('pre'), { textContent: String(error) }));
}

async function boot() {
  [ctx, themes, locales] = await Promise.all([loadGameContext(), fetchThemes(), fetchLocales()]);
  if (themes.length === 0) throw new Error('No theme installed in public/themes/');

  tabs = createTabs(ctx.tabs, () => state && render());

  const prefs = loadPrefs();
  locale = pickLocale(prefs.lang);
  const initialTheme = themes.find((th) => th.id === prefs.theme) ?? themes[0];

  $('#cookie-warning').hidden = cookiesAvailable();
  $('#theme-select').addEventListener('change', (e) => setTheme(e.target.value));
  $('#locale-select').addEventListener('change', async (e) => {
    locale = e.target.value;
    persistPrefs();
    await refreshTexts();
    render();
  });

  await setTheme(initialTheme.id);

  state = loadSavedState() ?? createState(ctx);
  reportRepair();
  catchUp((Date.now() - state.savedAt) / 1000);
  persist();
  render();

  lastFrame = Date.now();
  setInterval(frame, TICK_MS);
  setInterval(persist, ctx.rules.autosaveSeconds * 1000);
  document.addEventListener('visibilitychange', () => document.hidden && persist());
  addEventListener('pagehide', persist);
}

boot().catch(showFatal);