import { DOCUMENT } from '@angular/common';
import { Component, EventEmitter, Inject, OnInit, Output, Input } from '@angular/core';
import { BaseComponent } from '@common/base/base.component';
import { interval, Subject, Subscription } from 'rxjs';
import { distinctUntilChanged } from 'rxjs/operators';
import { type } from 'os';
import { SimpleChanges } from '@angular/core';
import { ToCEntry } from './table-of-contents-entry';

export interface Link {
	/* id of the section*/
	id: string;
	/* header type h3/h4 */
	type: string;
	/* If the anchor is in view of the page */
	active: boolean;
	/* name of the anchor */
	name: string;
	/* top offset px of the anchor */
	top: number;
	page: number;
	section: number;
	show: boolean;
	selected: boolean;
}

@Component({
	selector: 'dataset-profile-table-of-contents',
	styleUrls: ['./table-of-contents.scss'],
	templateUrl: './table-of-contents.html'
})
export class DatasetProfileTableOfContents extends BaseComponent implements OnInit {

	@Input() links: ToCEntry[];
	container: string;
	headerSelectors = '.toc-page-header, .toc-section-header, .toc-compositeField-header';
	@Output() stepFound = new EventEmitter<LinkToScroll>();
	@Output() currentLinks = new EventEmitter<Link[]>();

	@Output() itemClick = new EventEmitter<ToCEntry>();


	subscription: Subscription;
	linksSubject: Subject<HTMLElement[]> = new Subject<HTMLElement[]>();

	@Input() isActive: boolean;
	show: boolean = false;

	constructor(
		@Inject(DOCUMENT) private _document: Document) {
		super();
	}


	ngOnInit(): void {
		//emit value every 500ms
		// const source = interval(500);
		// this.subscription = source.subscribe(val => {
		// 	const headers = Array.from(this._document.querySelectorAll(this.headerSelectors)) as HTMLElement[];
		// 	this.linksSubject.next(headers);
		// });

		// if (!this.links || this.links.length === 0) {
		// 	this.linksSubject.asObservable()
		// 		.pipe(distinctUntilChanged((p: HTMLElement[], q: HTMLElement[]) => JSON.stringify(p) == JSON.stringify(q)))
		// 		.subscribe(headers => {
		// 			const links: Array<Link> = [];

		// 			if (headers.length) {
		// 				let page;
		// 				let section;
		// 				let show
		// 				for (const header of headers) {
		// 					let name;
		// 					let id;
		// 					if (header.classList.contains('toc-page-header')) {  // deprecated after removing stepper
		// 						name = header.innerText.trim().replace(/^link/, '');
		// 						id = header.id;
		// 						page = header.id.split('_')[1];
		// 						section = undefined;
		// 						show = true;
		// 					} else if (header.classList.contains('toc-section-header')) {
		// 						name = header.childNodes[0].childNodes[0].childNodes[0].childNodes[0].childNodes[0].nodeValue.trim().replace(/^link/, '');
		// 						id = header.id;
		// 						page = header.id.split('.')[1];
		// 						section = header.id;
		// 						if (header.id.split('.')[4]) { show = false; }
		// 						else { show = true; }
		// 					} else if (header.classList.contains('toc-compositeField-header')) {
		// 						name = (header.childNodes[0]).nodeValue.trim().replace(/^link/, '');
		// 						id = header.id;
		// 						// id = header.parentElement.parentElement.parentElement.id;
		// 						show = false;
		// 					}
		// 					const { top } = header.getBoundingClientRect();
		// 					links.push({
		// 						name,
		// 						id,
		// 						type: header.tagName.toLowerCase(),
		// 						top: top,
		// 						active: false,
		// 						page: page,
		// 						section: section,
		// 						show: show,
		// 						selected: false
		// 					});
		// 				}
		// 			}
		// 			this.links = links;
		// 			// Initialize selected for button next on dataset wizard component editor
		// 			this.links.length > 0 ? this.links[0].selected = true : null;
		// 		})
		// }

	}

	ngOnChanges(changes: SimpleChanges) {
		// if (!this.isActive && this.links && this.links.length > 0) {
		// 	this.links.forEach(link => {
		// 		link.selected = false;
		// 	})
		// 	this.links[0].selected = true;
		// }
	}

	goToStep(link: Link) {
		// this.stepFound.emit({
		// 	page: link.page,
		// 	section: link.section
		// });
		// this.currentLinks.emit(this.links);

		// setTimeout(() => {
		// 	const target = document.getElementById(link.id);
		// 	target.scrollIntoView(true);

		// 	var scrolledY = window.scrollY;
		// 	if (scrolledY) {
		// 		window.scroll(0, scrolledY - 70);
		// 	}
		// }, 500);
	}

	toggle(headerLink: Link) {
		// const headerPage = +headerLink.name.split(" ", 1);
		// let innerPage;
		// for (const link of this.links) {
		// 	link.selected = false;
		// 	if (link.type === 'mat-expansion-panel') {
		// 		innerPage = +link.name.split(".", 1)[0];
		// 		if (isNaN(innerPage)) { innerPage = +link.name.split(" ", 1) }
		// 	} else if (link.type === 'h5') {
		// 		innerPage = +link.name.split(".", 1)[0];
		// 	}
		// 	if (headerPage === innerPage && (link.type !== 'mat-expansion-panel' || (link.type === 'mat-expansion-panel' && link.id.split(".")[4]))) {
		// 		link.show = !link.show;
		// 	}
		// }
		// headerLink.selected = true;
	}

	// getIndex(link: Link): number {
	// 	return +link.id.split("_", 2)[1];
	// }


	itemClicked(item: ToCEntry){
		//leaf node
		this.itemClick.emit(item);
	}
	
	// propagateClickToParent(childIds:ToCEntry[], currentItem: ToCEntry){
	// 	childIds.push(currentItem);
	// 	this.itemClick.emit(childIds);
	// }


}

export interface LinkToScroll {
	page: number;
	section: number;
}