import { h } from 'preact';
import { useEffect, useRef, useState } from 'preact/hooks';
import styles from '../NewGame.module.css';
import { UI_CONSTANTS, ERROR_MESSAGES, ARIA_LABELS, FORM_CONFIG, ERROR_STYLES } from '../../utils/constants';
import { PlayerSelectModal } from './PlayerSelectModal';

interface PlayerStepProps {
  playerNameHistory: string[];
  onNext: (name: string) => void;
  onCancel: () => void;
  initialValue?: string;
}

export const Player1Step = ({ playerNameHistory, onNext, onCancel, initialValue = '' }: PlayerStepProps) => {
  const [player1, setPlayer1] = useState(initialValue);
  const [error, setError] = useState<string | null>(null);
  const [filteredNames, setFilteredNames] = useState(playerNameHistory);
  const [isModalOpen, setIsModalOpen] = useState(false);
  const inputRef = useRef<HTMLInputElement>(null);

  useEffect(() => {
    if (!player1) {
      setFilteredNames(playerNameHistory);
    } else {
      setFilteredNames(
        playerNameHistory.filter(name =>
          name.toLowerCase().includes(player1.toLowerCase())
        )
      );
    }
  }, [player1, playerNameHistory]);

  const handleSubmit = (e: Event) => {
    e.preventDefault();
    const trimmedName = player1.trim();
    if (!trimmedName) {
      setError(ERROR_MESSAGES.PLAYER1_REQUIRED);
      if (inputRef.current) {
        inputRef.current.focus();
        inputRef.current.setAttribute('aria-invalid', 'true');
      }
      return;
    }
    if (trimmedName.length > FORM_CONFIG.MAX_PLAYER_NAME_LENGTH) {
      setError(`Spielername darf maximal ${FORM_CONFIG.MAX_PLAYER_NAME_LENGTH} Zeichen lang sein`);
      if (inputRef.current) {
        inputRef.current.focus();
        inputRef.current.setAttribute('aria-invalid', 'true');
      }
      return;
    }
    setError(null);
    if (inputRef.current) {
      inputRef.current.setAttribute('aria-invalid', 'false');
    }
    onNext(trimmedName);
  };

  const handleQuickPick = (name: string) => {
    setError(null);
    onNext(name);
  };

  const handleModalSelect = (name: string) => {
    setIsModalOpen(false);
    handleQuickPick(name);
  };

  const handleClear = () => {
    setPlayer1('');
    setError(null);
    if (inputRef.current) inputRef.current.focus();
  };

  return (
    <form className={styles['new-game-form']} onSubmit={handleSubmit} aria-label="Spieler 1 Eingabe" autoComplete="off">
      <div className={styles['form-header']}>
        <div className={styles['screen-title']}>Name Spieler 1</div>
        <div className={styles['progress-indicator']} style={{ marginBottom: UI_CONSTANTS.MARGIN_BOTTOM_MEDIUM }}>
          <span className={styles['progress-dot'] + ' ' + styles['active']} />
          <span className={styles['progress-dot']} />
          <span className={styles['progress-dot']} />
          <span className={styles['progress-dot']} />
          <span className={styles['progress-dot']} />
          <span className={styles['progress-dot']} />
          <span className={styles['progress-dot']} />
        </div>
      </div>
      
      <div className={styles['form-content']}>
        <div className={styles['player-input'] + ' ' + styles['player1-input']} style={{ marginBottom: UI_CONSTANTS.MARGIN_BOTTOM_LARGE, position: 'relative' }}>
        <label htmlFor="player1-input" style={{ fontSize: UI_CONSTANTS.LABEL_FONT_SIZE, fontWeight: 600 }}>Spieler 1</label>
        <div style={{ position: 'relative', width: '100%' }}>
          <input
            id="player1-input"
            className={styles['name-input']}
            placeholder="Name Spieler 1"
            value={player1}
            onInput={(e: Event) => {
              const target = e.target as HTMLInputElement;
              const value = target.value;
              setPlayer1(value);
              if (value.length > FORM_CONFIG.MAX_PLAYER_NAME_LENGTH) {
                setError(`Spielername darf maximal ${FORM_CONFIG.MAX_PLAYER_NAME_LENGTH} Zeichen lang sein`);
                target.setAttribute('aria-invalid', 'true');
              } else if (value.trim() && error) {
                setError(null);
                target.setAttribute('aria-invalid', 'false');
              }
            }}
            autoComplete="off"
            aria-label="Name Spieler 1"
            aria-describedby="player1-help"
            style={{ 
              fontSize: UI_CONSTANTS.INPUT_FONT_SIZE, 
              minHeight: UI_CONSTANTS.INPUT_MIN_HEIGHT, 
              marginTop: 12, 
              marginBottom: 12, 
              width: '100%', 
              paddingRight: UI_CONSTANTS.INPUT_PADDING_RIGHT 
            }}
            ref={inputRef}
          />
          <div id="player1-help" className="sr-only">
            Geben Sie den Namen für Spieler 1 ein. Maximal {FORM_CONFIG.MAX_PLAYER_NAME_LENGTH} Zeichen erlaubt.
          </div>
          {player1.length > FORM_CONFIG.CHARACTER_COUNT_WARNING_THRESHOLD && (
            <div style={{ 
              fontSize: '0.875rem', 
              color: player1.length > FORM_CONFIG.MAX_PLAYER_NAME_LENGTH ? '#f44336' : '#ff9800',
              marginTop: '4px',
              textAlign: 'right'
            }}>
              {player1.length}/{FORM_CONFIG.MAX_PLAYER_NAME_LENGTH} Zeichen
            </div>
          )}
          {player1 && (
            <button
              type="button"
              className={styles['clear-input-btn']}
              aria-label="Feld leeren"
              onClick={handleClear}
              style={{
                position: 'absolute',
                right: 8,
                top: '50%',
                transform: 'translateY(-50%)',
                background: 'none',
                border: 'none',
                cursor: 'pointer',
                fontSize: 24,
                color: '#aaa',
                padding: 0,
                zIndex: 2
              }}
              tabIndex={0}
            >
              ×
            </button>
          )}
        </div>
        {filteredNames.length > 0 && (
          <div style={{ display: 'flex', flexWrap: 'wrap', gap: 12, marginTop: 8 }}>
            {filteredNames.slice(0, UI_CONSTANTS.MAX_QUICK_PICKS).map((name, idx) => (
              <button
                type="button"
                key={name + idx}
                className={styles['quick-pick-btn']}
                style={{ 
                  fontSize: UI_CONSTANTS.QUICK_PICK_FONT_SIZE, 
                  padding: UI_CONSTANTS.QUICK_PICK_PADDING, 
                  borderRadius: 8, 
                  background: '#333', 
                  color: '#fff', 
                  border: 'none', 
                  cursor: 'pointer' 
                }}
                onClick={() => handleQuickPick(name)}
                aria-label={ARIA_LABELS.QUICK_PICK(name)}
              >
                {name}
              </button>
            ))}
            {playerNameHistory.length > UI_CONSTANTS.MAX_QUICK_PICKS && (
              <button
                type="button"
                className={styles['quick-pick-btn']}
                style={{ 
                  fontSize: UI_CONSTANTS.QUICK_PICK_FONT_SIZE, 
                  padding: UI_CONSTANTS.QUICK_PICK_PADDING, 
                  borderRadius: 8, 
                  background: '#333', 
                  color: '#fff', 
                  border: 'none', 
                  cursor: 'pointer' 
                }}
                onClick={() => setIsModalOpen(true)}
                aria-label={ARIA_LABELS.SHOW_MORE_PLAYERS}
              >
                ...
              </button>
            )}
          </div>
        )}
        </div>
        {error && (
          <div 
            className={styles['validation-error']} 
            style={{ 
              marginBottom: 16,
              ...ERROR_STYLES.CONTAINER
            }}
            role="alert"
            aria-live="polite"
          >
            <span style={ERROR_STYLES.ICON}>⚠️</span>
            {error}
          </div>
        )}
      </div>
      
      <div className={styles['form-footer']}>
        <div className={styles['arrow-nav']} style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center' }}>
        <button
          type="button"
          className={styles['arrow-btn']}
          aria-label="Zurück"
          onClick={onCancel}
          style={{ fontSize: 48, width: 80, height: 80, borderRadius: '50%', background: '#222', color: '#fff', border: 'none', boxShadow: '0 2px 8px rgba(0,0,0,0.15)', cursor: 'pointer' }}
        >
          &#8592;
        </button>
        <button
          type="submit"
          className={styles['arrow-btn']}
          aria-label="Weiter"
          disabled={!player1.trim()}
          style={{ fontSize: 48, width: 80, height: 80, borderRadius: '50%', background: '#222', color: '#fff', border: 'none', boxShadow: '0 2px 8px rgba(0,0,0,0.15)', cursor: 'pointer', opacity: !player1.trim() ? 0.5 : 1 }}
        >
          &#8594;
        </button>
        </div>
      </div>
      
      {isModalOpen && (
        <PlayerSelectModal
          players={playerNameHistory}
          onSelect={handleModalSelect}
          onClose={() => setIsModalOpen(false)}
        />
      )}
    </form>
  );
};