import { Editor } from 'editor/editor'
import {
	safeGetSelection, safeGetRangeAt,
	moveChildren,
	markNames, blockNames, parentBlockNames,
} from 'editor/utils'
import { EditorNode, getType, getValidParentInSelection } from 'editor/types'

export interface EditorBlock extends EditorNode {
}

function makeBlock (tag: string): EditorBlock {
	return {
		selector: tag,
		allowedChildren: [...markNames, 'text'],
		handleEmpty: 'do-nothing',
		create: () => document.createElement(tag),
	}
}

export const li: EditorBlock = makeBlock('li')

// XXX: si agregás algo acá, agregalo a blockNames
// (y probablemente le quieras hacer un botón en app/views/posts/attributes/_content.haml)
export const blocks: { [propName: string]: EditorBlock } = {
	paragraph: makeBlock('p'),
	h1: makeBlock('h1'),
	h2: makeBlock('h2'),
	h3: makeBlock('h3'),
	h4: makeBlock('h4'),
	h5: makeBlock('h5'),
	h6: makeBlock('h6'),
	unordered_list: {
		...makeBlock('ul'),
		allowedChildren: ['li'],
		handleEmpty: li,
	},
	ordered_list: {
		...makeBlock('ol'),
		allowedChildren: ['li'],
		handleEmpty: li,
	},
}

export function setupButtons (editor: Editor): void {
	for (const [ name, type ] of Object.entries(blocks)) {
		const buttonEl = editor.toolbarEl.querySelector(`[data-editor-button="block-${name}"]`)
		if (!buttonEl) continue
		buttonEl.addEventListener("click", event => {
			event.preventDefault()

			const list = getValidParentInSelection({ editor, type: name })

			// No borrar cosas como multimedia
			if (blockNames.indexOf(getType(list[1])!.typeName) === -1) {
				return
			}

			let replacementType = list[1].matches(type.selector)
				? blocks.paragraph
				: type

			const el = replacementType.create(editor)
			replacementType.onClick && replacementType.onClick(editor, el)
			moveChildren(list[1], el, null)
			list[0].replaceChild(el, list[1])
			window.getSelection()?.collapse(el)

			return false
		})
	}
}