import React, { useEffect, useState } from 'react';

import { ipcChannels } from '../../shared/ipc/contracts';
import {
  DICE_COUNT_MAX,
  DICE_COUNT_MIN,
  DICE_SIDES,
  clampDiceCount,
  type DiceSides,
} from '../../shared/types/diceRoll';
import { useEditorI18n } from '../editor/i18n/EditorI18nContext';
import { getDndApi } from '../shared/dndApi';
import { useDiceRollState } from '../shared/dice/useDiceRollState';
import { Button } from '../shared/ui/controls';

import styles from './DiceApp.module.css';

export function DiceApp() {
  const { t } = useEditorI18n();
  const api = getDndApi();
  const [state, diceApi] = useDiceRollState();
  const [sides, setSides] = useState<DiceSides>(20);
  const [count, setCount] = useState(1);
  const [countDraft, setCountDraft] = useState('1');

  useEffect(() => {
    const onKey = (e: KeyboardEvent) => {
      if (e.key === 'Escape') {
        void api.invoke(ipcChannels.windows.closeDice, {});
      }
    };
    window.addEventListener('keydown', onKey);
    return () => window.removeEventListener('keydown', onKey);
  }, [api]);

  const commitCountDraft = () => {
    const trimmed = countDraft.trim();
    if (trimmed === '') {
      setCount(DICE_COUNT_MIN);
      setCountDraft(String(DICE_COUNT_MIN));
      return;
    }
    const parsed = Number(trimmed);
    if (!Number.isFinite(parsed) || parsed < DICE_COUNT_MIN) {
      setCount(DICE_COUNT_MIN);
      setCountDraft(String(DICE_COUNT_MIN));
      return;
    }
    const next = clampDiceCount(parsed);
    setCount(next);
    setCountDraft(String(next));
  };

  const setCountClamped = (n: number) => {
    const next = clampDiceCount(n);
    setCount(next);
    setCountDraft(String(next));
  };

  const showToPlayers = state?.visibleToPlayers ?? true;

  return (
    <div className={styles.page} data-testid="dice-app">
      <div className={styles.sectionLabel}>{t('dice.sides')}</div>
      <div className={styles.sidesGrid}>
        {DICE_SIDES.map((s) => (
          <Button
            key={s}
            variant={sides === s ? 'primary' : 'ghost'}
            onClick={() => setSides(s)}
            data-testid={`dice-side-${s}`}
          >
            d{s}
          </Button>
        ))}
      </div>

      <div className={styles.sectionLabel}>{t('dice.count')}</div>
      <div className={styles.countRow}>
        <Button
          variant="ghost"
          onClick={() => setCountClamped(count - 1)}
          ariaLabel={t('dice.dec')}
          disabled={count <= DICE_COUNT_MIN}
        >
          −
        </Button>
        <input
          className={styles.countValue}
          type="text"
          inputMode="numeric"
          value={countDraft}
          onChange={(e) => {
            const digits = e.target.value.replace(/\D/g, '');
            if (digits === '') {
              setCountDraft('');
              return;
            }
            const n = Number(digits);
            if (!Number.isFinite(n)) {
              setCountDraft(String(DICE_COUNT_MIN));
              setCount(DICE_COUNT_MIN);
              return;
            }
            if (n > DICE_COUNT_MAX) {
              setCountDraft(String(DICE_COUNT_MAX));
              setCount(DICE_COUNT_MAX);
              return;
            }
            setCountDraft(digits);
          }}
          onBlur={() => commitCountDraft()}
          onKeyDown={(e) => {
            if (e.key === 'Enter') {
              e.preventDefault();
              commitCountDraft();
              (e.currentTarget as HTMLInputElement).blur();
            }
          }}
          aria-label={t('dice.count')}
          data-testid="dice-count"
        />
        <Button
          variant="ghost"
          onClick={() => setCountClamped(count + 1)}
          ariaLabel={t('dice.inc')}
          disabled={count >= DICE_COUNT_MAX}
        >
          +
        </Button>
      </div>

      <label className={styles.checkRow}>
        <input
          type="checkbox"
          checked={showToPlayers}
          onChange={(e) =>
            void diceApi.dispatch({ kind: 'setVisibleToPlayers', visible: e.target.checked })
          }
          data-testid="dice-show-to-players"
        />
        <span>{t('dice.showAnimationToPlayers')}</span>
      </label>

      <div className={styles.actions}>
        <Button
          variant="primary"
          disabled={clampDiceCount(Number(countDraft.trim()) || count) < 1}
          onClick={() => {
            const next = clampDiceCount(Number(countDraft.trim()));
            setCount(next);
            setCountDraft(String(next));
            if (next < 1) return;
            void diceApi.dispatch({ kind: 'roll', count: next, sides });
          }}
          data-testid="dice-roll"
        >
          {t('dice.roll')}
        </Button>
        <Button
          variant="ghost"
          disabled={!state?.values.length && !state?.active}
          onClick={() => void diceApi.dispatch({ kind: 'clear' })}
        >
          {t('dice.clear')}
        </Button>
      </div>

      {state && state.values.length > 0 ? (
        <div className={styles.lastResult} data-testid="dice-last-result">
          <div className={styles.lastLabel}>{t('dice.result')}</div>
          <div className={styles.lastNotation}>{state.notation}</div>
          <div className={styles.valueChips} aria-label={t('dice.result')}>
            {state.values.map((v, i) => (
              <span key={`${state.revision}-${i}`} className={styles.valueChip}>
                {v}
              </span>
            ))}
          </div>
          <div className={styles.lastTotal}>
            {t('dice.total')}: <strong>{state.total}</strong>
          </div>
          {state.active ? <div className={styles.rollingHint}>{t('dice.rolling')}</div> : null}
        </div>
      ) : (
        <div className={styles.emptyResult}>{t('dice.noResult')}</div>
      )}
    </div>
  );
}