import * as DataEvent from '../events/DataEvent.js';
import EventEmitter from '../events/EventEmitter.js';
import * as EditorEvent from '../events/EditorEvent.js';
import Prism from '../vendor/prism.js';
//import MarkdownLang from '../vendor/lang/prism-markdown.js';
//Prism.language.md = '../vendor/lang/prism-markdown.js';
//Prism.languauges['markdown'];
class TextEditor extends EventEmitter {
	/**
	 * Text Editor UI Component
	 * @constructor
	 * @param {object} textEditor - Text area that will edit text
	 * @param {number} scrollLimit - YPos where editor position will become fixed
	 */
	//--------------------------
	// constructor
	//--------------------------
	constructor(textEditor, scrollLimit) {
		super();

		document
			.querySelector('[role="text-editor-control"]')
			.addEventListener('scroll', e => {
				console.log('HERE');
			});

		document.body.addEventListener('scroll', e => {
			var fixLimit = scrollLimit;
			//console.log('POSITION', document.body.scrollTop + ' : ' + fixLimit);
			if (document.body.scrollTop + 5 >= fixLimit) {
				document
					.querySelector('[role="text-editor-control"]')
					.classList.add('control-freeze');
			} else {
				document
					.querySelector('[role="text-editor-control"]')
					.classList.remove('control-freeze');
			}
		});
		document.getElementById('edit').addEventListener('input', e => {
			let result_element = document.querySelector('#highlight-content');
			this.textEditor = textEditor;

			// Update code
			let text = e.target.value;
			result_element.innerHTML = text
				.replace(new RegExp('&', 'g'), '&')
				.replace(new RegExp('<', 'g'), '&lt;');
			let editorHeight = document.getElementById('highlight').offsetHeight;
			document.querySelector('[role="edit-post-wrapper"]').style.height =
				editorHeight + 'px';
			e.target.style.height = editorHeight + 30 + 'px'; //TODO: yeah, it's ugly but it works for now, fix soon
			// Syntax Highlight
			Prism.highlightElement(result_element);
		});
		document.getElementById('edit').addEventListener('scroll', e => {
			/* Scroll result to scroll coords of event - sync with textarea */
			let result_element = document.querySelector('#highlight');
			// Get and set x and y
			result_element.scrollTop = e.scrollTop;
			result_element.scrollLeft = e.scrollLeft;
		});
		document.getElementById('edit').dispatchEvent(new Event('input'));
		this.setInputs();

		//freeze editor formatting so it doesn't scroll off screen
	}
	//--------------------------
	// methods
	//--------------------------
	setInputs() {
		var editorButtons = document.querySelectorAll('.editor-button');
		for (var i = 0, length = editorButtons.length; i < length; i++) {
			editorButtons[i].addEventListener(
				'click',
				e => this.handleEditorOption(e),
				false
			);
		}
	}
	notify(type, data) {
		switch (type) {
			case DataEvent.PAGE_UPDATED:
				document.getElementById('submit-update').classList.add('icon-hide');
				document.getElementById('submit-good').classList.remove('icon-hide');
				document.getElementById('edit-update').classList.remove('submit-start');
				document.getElementById('edit-update').classList.add('submit-cool');
				setTimeout(() => {
					document
						.getElementById('submit-update')
						.classList.remove('icon-hide');
					document.getElementById('submit-good').classList.add('icon-hide');
					document.getElementById('edit-update').classList.add('submit-start');
					document
						.getElementById('edit-update')
						.classList.remove('submit-cool');
				}, 2000);
				break;
			case DataEvent.PAGE_ADDED:
				// do nothing
				break;
			case EditorEvent.EDITOR_UPLOAD_POST_IMAGE: {
				let len = this.textEditor.value.length;
				let start = this.textEditor.selectionStart;
				let end = this.textEditor.selectionEnd;
				let insert = '![image alt text](' + data + ')';

				this.textEditor.value =
					this.textEditor.value.substring(0, start) +
					insert +
					this.textEditor.value.substring(end, len);
				document.getElementById('edit').dispatchEvent(new Event('input'));
				break;
			}
		}
	}
	//--------------------------
	// event handlers
	//--------------------------
	handleEditorOption(e) {
		e.preventDefault();
		let len = this.textEditor.value.length;
		let start = this.textEditor.selectionStart;
		let end = this.textEditor.selectionEnd;

		let selectedText = this.textEditor.value.substring(start, end);
		let insert = '';
		switch (e.target.id) {
			case 'edit-bold':
				insert = '**' + selectedText + '**';
				this.textEditor.value =
					this.textEditor.value.substring(0, start) +
					insert +
					this.textEditor.value.substring(end, len);

				break;
			case 'edit-italic':
				insert = '*' + selectedText + '*';
				//console.log(this.textEditor);
				this.textEditor.value =
					this.textEditor.value.substring(0, start) +
					insert +
					this.textEditor.value.substring(end, len);
				break;
			case 'edit-strikethrough':
				insert = '~~' + selectedText + '~~';
				this.textEditor.value =
					this.textEditor.value.substring(0, start) +
					insert +
					this.textEditor.value.substring(end, len);
				break;
			case 'edit-header1':
				insert = '# ' + selectedText + '\n';
				this.textEditor.value =
					this.textEditor.value.substring(0, start) +
					insert +
					this.textEditor.value.substring(end, len);
				break;
			case 'edit-header2':
				insert = '## ' + selectedText + '\n';
				this.textEditor.value =
					this.textEditor.value.substring(0, start) +
					insert +
					this.textEditor.value.substring(end, len);
				break;
			case 'edit-header3':
				insert = '### ' + selectedText + '\n';
				this.textEditor.value =
					this.textEditor.value.substring(0, start) +
					insert +
					this.textEditor.value.substring(end, len);
				break;
			case 'edit-link':
				{
					let url = prompt("Let's get that url, boss");
					let link = url.toLowerCase();
					insert = '[' + selectedText + '](' + link + ')';
					this.textEditor.value =
						this.textEditor.value.substring(0, start) +
						insert +
						this.textEditor.value.substring(end, len);
				}
				break;
			case 'edit-image':
				//this.caretPos = position(this.textEditor).pos;
				this.emitEvent(EditorEvent.EDITOR_UPLOAD_POST_IMAGE);
				break;
			case 'submit-save':
			case 'edit-save':
				this.emitEvent(EditorEvent.EDITOR_SAVE);
				break;
			case 'submit-update':
			case 'edit-update':
				this.emitEvent(EditorEvent.EDITOR_UPDATE);
				break;
			case 'edit-delete':
				this.emitEvent(EditorEvent.EDITOR_DELETE);
				break;
			default:
				//do stuff
				break;
		}
		document.getElementById('edit').dispatchEvent(new Event('input'));
	}
}
export default TextEditor;