/** Headless test bot: plays the game continuously and prints every action it takes, timestamped
 * with the in-game clock. Runs until interrupted with Ctrl+C.
 *
 * Policy: at night, flee the nearest rabbit (survival comes first, regardless of what else is
 * available). By day, chop the nearest node (tree or bush, whichever is closer) if one exists;
 * once none are left, hunt the nearest rabbit instead. Whenever coins can afford it, buy the
 * cheapest currently-affordable upgrade (repeating until nothing more is affordable), printing
 * every upgrade's level after each purchase.
 *
 * Ticks are not paced to real time — each tick always advances the simulated clock by a fixed
 * TICK_SECONDS, and ticks run back-to-back as fast as the CPU allows (yielding briefly between
 * batches only so Ctrl+C and console output stay responsive).
 *
 * Controls (when stdin is a terminal): Space pauses/resumes, Escape (or Ctrl+C) stops.
 *
 * Run with: npx tsx scripts/play.ts [tickSeconds]
 */
import readline from 'node:readline';
import { bushesForDay, treesForDay } from '../src/game/constants';
import { formatClock } from '../src/game/daynight';
import { Rabbit } from '../src/game/entities/Rabbit';
import { ResourceNode } from '../src/game/entities/ResourceNode';
import { GameStore } from '../src/game/GameStore';
import { costForNextLevel, UPGRADE_LIST, type UpgradeId } from '../src/game/upgrades';

const MAP_WIDTH = 1200;
const MAP_HEIGHT = 800;
/** How many simulated seconds pass per tick — fixed, independent of how fast ticks actually run. */
const TICK_SECONDS = Number(process.argv[2] ?? 0.1);
/** Ticks per event-loop turn between yields — batching amortizes the yield's overhead while
 * still keeping Ctrl+C/output responsive within about one batch's worth of latency. */
const TICKS_PER_BATCH = 1000;
/** How far past the nearest rabbit to aim while fleeing it. */
const FLEE_DISTANCE = 400;

const store = new GameStore();
store.initialize(MAP_WIDTH, MAP_HEIGHT);

const startedAt = Date.now();

/** Total simulated seconds ticked so far — a monotonic counter independent of the in-game
 * day/hour clock (which resets on death and runs at a variable, upgradable pace). */
let totalSimulatedSeconds = 0;
let lastPurchaseSimulatedSeconds = 0;

/** Real time spent paused so far, excluded from formatElapsed() so the displayed elapsed real
 * time freezes while paused instead of continuing to tick. */
let pausedAccumulatedMs = 0;
let pauseStartedAt: number | null = null;

/** A duration (seconds) as HH:MM:SS. */
function formatDuration(totalSecondsRaw: number): string {
  const totalSeconds = Math.floor(totalSecondsRaw);
  const h = Math.floor(totalSeconds / 3600);
  const m = Math.floor((totalSeconds % 3600) / 60);
  const s = totalSeconds % 60;
  return `${String(h).padStart(2, '0')}:${String(m).padStart(2, '0')}:${String(s).padStart(2, '0')}`;
}

/** Real (wall-clock) time elapsed since the simulation started, as HH:MM:SS — excludes time spent
 * paused, so it freezes instead of continuing to advance while paused. */
function formatElapsed(): string {
  const now = Date.now();
  const ongoingPauseMs = pauseStartedAt !== null ? now - pauseStartedAt : 0;
  return formatDuration((now - startedAt - pausedAccumulatedMs - ongoingPauseMs) / 1000);
}

/** ANSI color codes — only applied when stdout is an actual terminal, so piped/redirected output
 * (e.g. into a log file) stays plain text instead of full of escape sequences. */
const RED = '\x1b[31m';
const GOLD = '\x1b[93m';
const GRAY = '\x1b[90m';
const RESET = '\x1b[0m';

function colorize(text: string, color: string): string {
  return process.stdout.isTTY ? `${color}${text}${RESET}` : text;
}

/** Inventory contents, resource names shortened to one emoji each. */
function formatInventory(): string {
  const inv = store.inventory;
  return `🪵${inv.logs} 🌿${inv.twigs} 🍖${inv.meat} 🪙${inv.coins.toFixed(1)}`;
}

function log(message: string, color?: string): void {
  const line = `[+${formatElapsed()} | сим ${formatDuration(totalSimulatedSeconds)} | ${store.day}:${formatClock(store.hour)}] ${formatInventory()} ${message}`;
  console.log(color ? colorize(line, color) : line);
}

function logUpgradeLevels(): void {
  const summary = UPGRADE_LIST.map((def) => `${def.id}=${store.upgradeLevels[def.id]}`).join(' ');
  console.log(`  Апгрейды: ${summary}`);
}

/** Buys every upgrade the player can currently afford, cheapest first, until none are — costs
 * rise after each purchase, so this re-checks from scratch rather than assuming one is enough. */
function buyAffordableUpgrades(): void {
  for (;;) {
    let cheapestId: UpgradeId | null = null;
    let cheapestCost = Infinity;
    for (const def of UPGRADE_LIST) {
      const cost = costForNextLevel(def, store.upgradeLevels[def.id]);
      if (store.inventory.coins >= cost && cost < cheapestCost) {
        cheapestId = def.id;
        cheapestCost = cost;
      }
    }
    if (!cheapestId)
      return;

    store.buyUpgrade(cheapestId);
    const def = UPGRADE_LIST.find((d) => d.id === cheapestId)!;
    const sincePrevious = totalSimulatedSeconds - lastPurchaseSimulatedSeconds;
    log(`Куплен апгрейд «${def.name}» за ${cheapestCost.toFixed(1)} — уровень ${store.upgradeLevels[cheapestId]}, с последней покупки ${sincePrevious.toFixed(1)}с`, GOLD);
    lastPurchaseSimulatedSeconds = totalSimulatedSeconds;
    logUpgradeLevels();
  }
}

type Behavior = 'fleeing' | 'chopping' | 'hunting' | 'idle';
let behavior: Behavior = 'idle';
let targetId: string | null = null;

/** Picks what to do this tick and drives the character toward it — only logs when the decision
 * actually changes (a new target, or switching behavior), not every tick it's re-affirmed. */
function decideAction(): void {
  if (store.isNight) {
    const rabbit = Rabbit.findNearestToPosition(store.rabbits, store.character);
    if (rabbit) {
      // Keyed on the behavior alone, not which rabbit happens to be nearest right now — while
      // fleeing, the nearest rabbit's identity can flip from tick to tick as the character moves,
      // which isn't a new action worth a fresh log line the way switching chop targets is.
      if (behavior !== 'fleeing') {
        log(`Ночь — убегает от кролика (${Math.round(rabbit.x)}, ${Math.round(rabbit.y)})`);
        behavior = 'fleeing';
      }
      targetId = rabbit.id;
      const dx = store.character.x - rabbit.x;
      const dy = store.character.y - rabbit.y;
      const distance = Math.hypot(dx, dy) || 1;
      store.moveTo(
        Math.min(Math.max(store.character.x + (dx / distance) * FLEE_DISTANCE, 0), MAP_WIDTH),
        Math.min(Math.max(store.character.y + (dy / distance) * FLEE_DISTANCE, 0), MAP_HEIGHT),
      );
      return;
    }
    // No rabbits to flee from — fall through to the normal day-shaped behavior below.
  }

  const node = ResourceNode.findNearestToPosition(store.nodes, store.character);
  if (node) {
    if (behavior !== 'chopping' || targetId !== node.id) {
      log(`Бежит к ${nodeEmoji(node.kind)} (${Math.round(node.x)}, ${Math.round(node.y)})`);
      behavior = 'chopping';
      targetId = node.id;
    }
    store.holdNode(node.id);
    return;
  }

  const rabbit = Rabbit.findNearestToPosition(store.rabbits, store.character);
  if (rabbit) {
    if (behavior !== 'hunting' || targetId !== rabbit.id) {
      log(`🌳🌱 нет — охотится на кролика (${Math.round(rabbit.x)}, ${Math.round(rabbit.y)})`);
      behavior = 'hunting';
      targetId = rabbit.id;
    }
    store.holdRabbit(rabbit.id);
    return;
  }

  if (behavior !== 'idle') {
    log('Нечего делать — ждёт.');
    behavior = 'idle';
    targetId = null;
  }
  store.release();
}

log(`Игра началась. Тик = ${TICK_SECONDS}с симуляции, без привязки к реальному времени.`);

function nodeEmoji(kind: 'tree' | 'bush'): string {
  return kind === 'tree' ? '🌳' : '🌱';
}

/** Logs a node's depletion or a rabbit's death — not each individual chop/hit along the way, only
 * this one-off outcome — snapshotting what's about to be chopped/attacked before the tick, since a
 * depleted node or killed rabbit is removed from the store's arrays by the time the tick returns. */
function logCombatResults(preNode: ReturnType<typeof store.heldNode>, preRabbit: ReturnType<typeof store.heldRabbit>): void {
  if (preNode && !store.nodes.some((n) => n.id === preNode.id))
    log(`Срубил ${nodeEmoji(preNode.kind)} полностью`);

  if (preRabbit && !store.rabbits.some((r) => r.id === preRabbit.id))
    log('Убил кролика');
}

function runOneTick(): void {
  if (store.isDead) {
    log('Погиб! Начинается новая игра.', RED);
    store.initialize(MAP_WIDTH, MAP_HEIGHT);
    behavior = 'idle';
    targetId = null;
  }

  decideAction();

  const preNode = store.heldNode;
  const preRabbit = store.heldRabbit;

  store.tick(TICK_SECONDS);
  totalSimulatedSeconds += TICK_SECONDS;

  logCombatResults(preNode, preRabbit);
  buyAffordableUpgrades();
}

let running = true;
let paused = false;

function runBatch(): void {
  if (!running)
    return;
  if (!paused) {
    for (let i = 0; i < TICKS_PER_BATCH; i++)
      runOneTick();
  }
  // Rescheduled even while paused, so a paused run still notices Escape/Ctrl+C/Space promptly
  // instead of sitting blocked on nothing at all.
  setImmediate(runBatch);
}

setImmediate(runBatch);

/** Every 5 real seconds (not simulated — this fires on a wall-clock timer, independent of how
 * fast ticks are actually running): time since the last upgrade purchase, this in-game day's
 * resource cap (how many trees/bushes it allows), and what's actually still on the map. */
function printStats(): void {
  const sinceLastPurchase = totalSimulatedSeconds - lastPurchaseSimulatedSeconds;
  const treeCap = treesForDay(store.day);
  const bushCap = bushesForDay(store.day);
  const treesLeft = store.nodes.filter((n) => n.kind === 'tree').length;
  const bushesLeft = store.nodes.filter((n) => n.kind === 'bush').length;
  const logsLeft = store.nodes.reduce((sum, n) => sum + n.remaining.log, 0);
  const twigsLeft = store.nodes.reduce((sum, n) => sum + n.remaining.twig, 0);

  log(
    `Последняя покупка ${sinceLastPurchase.toFixed(1)}с назад; `
    + `Ресурсы: 🌳${treesLeft}/${treeCap} 🌱${bushesLeft}/${bushCap} 🪵${logsLeft} 🌿${twigsLeft}`,
    GRAY,
  );
}

setInterval(printStats, 5000);

function stop(reason: string): void {
  running = false;
  console.log(`\n${reason}`);
  process.exit(0);
}

function togglePause(): void {
  paused = !paused;
  if (paused) {
    pauseStartedAt = Date.now();
  } else if (pauseStartedAt !== null) {
    pausedAccumulatedMs += Date.now() - pauseStartedAt;
    pauseStartedAt = null;
  }
  log(paused ? 'Пауза (пробел — продолжить, Escape — остановить).' : 'Продолжение.');
}

if (process.stdin.isTTY) {
  readline.emitKeypressEvents(process.stdin);
  process.stdin.setRawMode(true);
  process.stdin.resume();
  process.stdin.on('keypress', (_str, key) => {
    if (!key)
      return;
    if (key.name === 'space')
      togglePause();
    else if (key.name === 'escape')
      stop('Остановлено пользователем (Escape).');
    else if (key.ctrl && key.name === 'c')
      stop('Остановлено пользователем (Ctrl+C).');
  });
} else {
  log('stdin не терминал — пробел/Escape недоступны, используйте Ctrl+C для остановки.');
}

process.on('SIGINT', () => stop('Остановлено пользователем (Ctrl+C).'));