import { Component, EventEmitter, Input, OnInit, Output, QueryList, SimpleChanges, ViewChildren } from '@angular/core';
import { UntypedFormGroup } from '@angular/forms';
import { VisibilityRulesService } from '@app/ui/description/editor/description-form/visibility-rules/visibility-rules.service';
import { Guid } from '@common/types/guid';
import { ToCEntry } from '../models/toc-entry';
import { ToCEntryType } from '../models/toc-entry-type.enum';

@Component({
	selector: 'table-of-contents-internal',
	styleUrls: ['./table-of-contents-internal.scss'],
	templateUrl: './table-of-contents-internal.html'
})
export class TableOfContentsInternal implements OnInit {

	@Input() tocentries: ToCEntry[] = null;
	@Input() selected: ToCEntry = null;
	// @Input() visibilityRules:Rule[] = [];
	@Output() entrySelected = new EventEmitter<ToCEntry>();
	@Input() propertiesFormGroup: UntypedFormGroup;

	expandChildren: boolean[];
	tocEntryTypeEnum = ToCEntryType;
	@Input() TOCENTRY_ID_PREFIX = "";
	@Input() showErrors: boolean = false;
	@Input() hiddenEntries: string[] = [];
	@Input() visibilityRulesService: VisibilityRulesService;
	@ViewChildren(TableOfContentsInternal) internalTables: QueryList<TableOfContentsInternal>;

	constructor() {
	}
	ngOnInit(): void {
		// console.log('component created' + JSON.stringify(this.tocentries));
		if (this.tocentries) {
			this.expandChildren = this.tocentries.map(() => false);
			if (this.selected) {
				for (let i = 0; i < this.tocentries.length; i++) {
					if (this._findTocEntryById(this.selected.id, this.tocentries[i].subEntries)) {
						if (this.expandChildren) {
							this.expandChildren[i] = true;
						}
						break;
					}
				}
			}
		}
	}

	ngOnChanges(changes: SimpleChanges) {
		if (changes.selected && this.selected) {
			for (let i = 0; i < this.tocentries.length; i++) {
				if (this._findTocEntryById(this.selected.id, this.tocentries[i].subEntries)) {
					if (this.expandChildren) {
						this.expandChildren[i] = true;
					}
					break;
				}
			}
		}
		// if (!this.isActive && this.links && this.links.length > 0) {
		// 	this.links.forEach(link => {
		// 		link.selected = false;
		// 	})
		// 	this.links[0].selected = true;
		// }
	}

	toggleExpand(index) {
		this.expandChildren[index] = !this.expandChildren[index];
		// console.log(this.expandChildren);
	}

	navigateToFieldSet(entry: ToCEntry, event) {
		if (entry.type === ToCEntryType.FieldSet) {

			const fieldSetId = entry.id;
			// const element = document.getElementById(this.TOCENTRY_ID_PREFIX + fieldSetId);
			const element = document.getElementById(fieldSetId);
			if (element) {
				element.click();//open mat expansion panel

				//scroll asyn in 200 ms so the expansion panel is expanded and the element coordinates are updated
				setTimeout(() => {
					const element = document.getElementById(fieldSetId);
					if (element) {
						element.scrollIntoView({ behavior: 'smooth' });
					}
				}, 300);
			}

		}
	}


	onEntrySelected(entry: ToCEntry) {
		this.entrySelected.emit(entry);
	}


	calculateStyle(entry: ToCEntry) {
		const style = {};
		style['font-size'] = entry.type === this.tocEntryTypeEnum.FieldSet ? '.9em' : '1em';
		return style;
	}

	calculateClass(entry: ToCEntry) {
		const myClass = {};

		if (this.selected && entry.id === this.selected.id) {
			myClass['selected'] = true;
		}

		if (entry.type != this.tocEntryTypeEnum.FieldSet) {
			myClass['section'] = true;
		}

		return myClass;
	}

	private _findTocEntryById(id: string, tocentries: ToCEntry[]): ToCEntry {
		if (!tocentries || !tocentries.length) {
			return null;
		}

		let tocEntryFound = tocentries.find(entry => entry.id === id);

		if (tocEntryFound) {
			return tocEntryFound;
		}

		for (let entry of tocentries) {
			const result = this._findTocEntryById(id, entry.subEntries);
			if (result) {
				tocEntryFound = result;
				break;
			}
		}

		return tocEntryFound ? tocEntryFound : null;
	}
	public invalidChildsVisible(entry: ToCEntry): boolean {
		if (!entry || !this.visibilityRulesService) {
			return false;
		}

		if (entry.type != this.tocEntryTypeEnum.FieldSet) {
			return entry.subEntries.some(_ => this.invalidChildsVisible(_));
		}
		if (entry.type === this.tocEntryTypeEnum.FieldSet) {
			const id = entry.id;
			if (!(this.visibilityRulesService.isVisibleMap[id.toString()])) {
				return false;
			}
			// const fieldsArray = entry.form.get('fields') as UntypedFormArray;
			const hasError = !entry.subEntries.every(field => {//every invalid field should be invisible
				//TODO: check this
				// if (field.invalid) {
				// 	const id = field.id;
				// 	const isVisible = this.visibilityRulesService.isVisibleMap[id);
				// 	if (isVisible) {
				// 		return false;
				// 	}
				// }
				return true;
			});
			return hasError;
		}
		return false;
	}
}