<template>
  <div v-if="editor" class="container">
    <div class="control-group">
      <div class="button-group">
        <button @click="editor.chain().focus().toggleHeading({ level: 1 }).run()" :class="{ 'is-active': editor.isActive('heading', { level: 1 }) }">
          H1
        </button>
        <button @click="editor.chain().focus().toggleHeading({ level: 2 }).run()" :class="{ 'is-active': editor.isActive('heading', { level: 2 }) }">
          H2
        </button>
        <button @click="editor.chain().focus().toggleHeading({ level: 3 }).run()" :class="{ 'is-active': editor.isActive('heading', { level: 3 }) }">
          H3
        </button>
      </div>
    </div>
    <editor-content :editor="editor" />
  </div>
</template>

<script>
import Document from '@tiptap/extension-document'
import Heading from '@tiptap/extension-heading'
import Paragraph from '@tiptap/extension-paragraph'
import Text from '@tiptap/extension-text'
import { Editor, EditorContent } from '@tiptap/vue-3'

export default {
  components: {
    EditorContent,
  },

  data() {
    return {
      editor: null,
    }
  },

  mounted() {
    this.editor = new Editor({
      extensions: [
        Document,
        Paragraph,
        Text,
        Heading.configure({
          levels: [1, 2, 3],
        }),
      ],
      content: `
        <h1>This is a 1st level heading</h1>
        <h2>This is a 2nd level heading</h2>
        <h3>This is a 3rd level heading</h3>
        <h4>This 4th level heading will be converted to a paragraph, because levels are configured to be only 1, 2 or 3.</h4>
      `,
    })
  },

  beforeUnmount() {
    this.editor.destroy()
  },
}
</script>

<style lang="scss">
/* Basic editor styles */
.tiptap {
  :first-child {
    margin-top: 0;
  }

  /* Heading styles */
  h1,
  h2,
  h3,
  h4,
  h5,
  h6 {
    line-height: 1.1;
    margin-top: 2.5rem;
    text-wrap: pretty;
  }

  h1,
  h2 {
    margin-top: 3.5rem;
    margin-bottom: 1.5rem;
  }

  h1 {
    font-size: 1.4rem;
  }

  h2 {
    font-size: 1.2rem;
  }

  h3 {
    font-size: 1.1rem;
  }

  h4,
  h5,
  h6 {
    font-size: 1rem;
  }
}
</style>
