import { useEffect, useState } from 'react';
import { useTranslation } from 'react-i18next';

import { useWhiteboardStrokes } from '../hooks/useWhiteboardStrokes';
import { XIcon } from './icons';
import {
  WhiteboardCanvas,
  type WhiteboardColor,
  type WhiteboardTool,
  type WhiteboardWidth,
} from './WhiteboardCanvas';

interface Props {
  whiteboardId: string;
  onClose: () => void;
}

const COLORS: WhiteboardColor[] = ['#000000', '#ef4444', '#3b82f6', '#22c55e', '#facc15', '#a855f7'];
const WIDTHS: WhiteboardWidth[] = [2, 4, 8];

export function WhiteboardModal({ whiteboardId, onClose }: Props) {
  const { t } = useTranslation();
  const { strokes, loading, error, insertStroke, clearAll } = useWhiteboardStrokes(whiteboardId);
  const [tool, setTool] = useState<WhiteboardTool>('pen');
  const [color, setColor] = useState<WhiteboardColor>('#000000');
  const [width, setWidth] = useState<WhiteboardWidth>(4);
  const [confirmClear, setConfirmClear] = useState(false);

  useEffect(() => {
    const onKey = (e: KeyboardEvent) => {
      if (e.key === 'Escape') onClose();
    };
    window.addEventListener('keydown', onKey);
    return () => window.removeEventListener('keydown', onKey);
  }, [onClose]);

  const handleConfirmClear = async () => {
    setConfirmClear(false);
    try {
      await clearAll();
    } catch (err) {
      console.error('clearAll failed', err);
    }
  };

  return (
    <div
      role="dialog"
      aria-modal="true"
      aria-label={t('app:whiteboard.title', { defaultValue: 'Whiteboard' })}
      className="fixed inset-0 z-[80] flex flex-col bg-ink-950/95"
    >
      <header className="flex shrink-0 items-center justify-between border-b border-line/40 bg-surface-2 px-4 py-2">
        <h2 className="font-display text-sm font-semibold text-fg">
          {t('app:whiteboard.title', { defaultValue: 'Whiteboard' })}
        </h2>
        <button
          type="button"
          onClick={onClose}
          aria-label={t('app:whiteboard.close', { defaultValue: 'Schließen' })}
          className="flex h-7 w-7 cursor-pointer items-center justify-center rounded-md text-fg-muted hover:bg-surface-3 hover:text-fg"
        >
          <XIcon className="h-3.5 w-3.5" />
        </button>
      </header>

      <div className="flex min-h-0 flex-1 items-center justify-center overflow-hidden p-6">
        {loading ? (
          <p className="text-sm text-fg-muted">
            {t('app:whiteboard.loading', { defaultValue: 'Lädt…' })}
          </p>
        ) : error ? (
          <p className="text-sm text-rose-400">
            {t('app:whiteboard.error', { defaultValue: 'Whiteboard konnte nicht geladen werden.' })}
          </p>
        ) : (
          <WhiteboardCanvas
            strokes={strokes}
            tool={tool}
            color={color}
            width={width}
            onStroke={(payload) => void insertStroke(payload)}
            whiteboardId={whiteboardId}
          />
        )}
      </div>

      <footer className="flex shrink-0 flex-wrap items-center gap-4 border-t border-line/40 bg-surface-2 px-4 py-3">
        <div className="flex items-center gap-1">
          {(['pen', 'eraser'] as WhiteboardTool[]).map((id) => {
            const label = id === 'pen' ? 'Stift' : 'Radierer';
            const active = tool === id;
            return (
              <button
                key={id}
                type="button"
                onClick={() => setTool(id)}
                aria-pressed={active}
                title={label}
                className={
                  'flex h-8 w-8 cursor-pointer items-center justify-center rounded-md text-xs font-semibold transition ' +
                  (active
                    ? 'bg-accent/20 text-accent ring-2 ring-accent/40'
                    : 'bg-surface-3 text-fg-muted hover:bg-surface hover:text-fg')
                }
              >
                {id === 'pen' ? '✎' : '⌫'}
              </button>
            );
          })}
        </div>

        <div className="h-6 w-px bg-line/40" aria-hidden />

        <div className="flex items-center gap-1">
          {COLORS.map((c) => {
            const active = color === c;
            return (
              <button
                key={c}
                type="button"
                onClick={() => setColor(c)}
                aria-pressed={active}
                aria-label={c}
                className={
                  'h-6 w-6 cursor-pointer rounded-full border-2 transition ' +
                  (active ? 'border-fg scale-110' : 'border-line/40 hover:scale-105')
                }
                style={{ backgroundColor: c }}
              />
            );
          })}
        </div>

        <div className="h-6 w-px bg-line/40" aria-hidden />

        <div className="flex items-center gap-1">
          {WIDTHS.map((w) => {
            const active = width === w;
            return (
              <button
                key={w}
                type="button"
                onClick={() => setWidth(w)}
                aria-pressed={active}
                title={w + 'px'}
                className={
                  'flex h-8 w-8 cursor-pointer items-center justify-center rounded-md transition ' +
                  (active
                    ? 'bg-accent/20 ring-2 ring-accent/40'
                    : 'bg-surface-3 hover:bg-surface')
                }
              >
                <div
                  className="rounded-full bg-fg"
                  style={{ width: w + 2 + 'px', height: w + 2 + 'px' }}
                />
              </button>
            );
          })}
        </div>

        <div className="ml-auto flex items-center gap-2">
          {confirmClear ? (
            <>
              <span className="text-xs text-fg-muted">
                {t('app:whiteboard.confirm_clear', { defaultValue: 'Alles löschen?' })}
              </span>
              <button
                type="button"
                onClick={() => setConfirmClear(false)}
                className="cursor-pointer rounded-md border border-line bg-surface-3 px-3 py-1.5 text-xs font-medium text-fg-muted transition hover:bg-surface"
              >
                {t('app:whiteboard.cancel', { defaultValue: 'Abbrechen' })}
              </button>
              <button
                type="button"
                onClick={() => void handleConfirmClear()}
                className="cursor-pointer rounded-md bg-rose-500 px-3 py-1.5 text-xs font-semibold text-white transition hover:bg-rose-500/90"
              >
                {t('app:whiteboard.confirm', { defaultValue: 'Ja, löschen' })}
              </button>
            </>
          ) : (
            <button
              type="button"
              onClick={() => setConfirmClear(true)}
              disabled={strokes.length === 0}
              className="cursor-pointer rounded-md border border-rose-500/40 bg-rose-500/10 px-3 py-1.5 text-xs font-semibold text-rose-600 transition hover:bg-rose-500/20 disabled:cursor-not-allowed disabled:opacity-50 dark:text-rose-300"
            >
              {t('app:whiteboard.clear_all', { defaultValue: 'Alles löschen' })}
            </button>
          )}
        </div>
      </footer>
    </div>
  );
}