import { defineBlock } from '../registry';

const LEVELS = [1, 2, 3, 4, 5, 6] as const;

export const heading = defineBlock({
  type: 'heading',
  spec: {
    content: { kind: 'text' },
    group: 'block',
    attrs: {
      level: { default: 1, validate: value => typeof value === 'number' && value >= 1 && value <= 6 },
    },
    toDOM: node => [`h${node.attrs['level'] ?? 1}`, 0],
    parseDOM: LEVELS.map(level => ({ tag: `h${level}`, attrs: { level } })),
  },
  inputRules: LEVELS.map(level => ({ match: new RegExp(`^#{${level}}\\s$`), attrs: { level } })),
  meta: { title: 'Heading', icon: 'heading', keywords: ['heading', 'title', 'h1', 'h2', 'h3'], group: 'basic' },
});