import { any } from 'codelyzer/util/function';
import { FormControl, FormGroupDirective, NgForm, FormGroup, FormBuilder } from '@angular/forms';
import { Observable } from 'rxjs/Rx';
import { setTimeout } from 'timers';
import { Component, EventEmitter, Input, OnInit, Output, ViewChild, ElementRef } from '@angular/core';
import 'rxjs/add/operator/debounceTime';
import 'rxjs/add/operator/map';
import { AutoCompleteChipConfiguration } from './AutoCompleteChipConfiguration';
import { ErrorStateMatcher, MatInput } from '@angular/material';

@Component({
	selector: 'auto-complete-chip',
	templateUrl: './autocompleteChips.component.html',
	styleUrls: ['./autocompleteChips.component.scss']
})
export class AutocompleteChipComponent implements OnInit {
	@Input()
	configuration: AutoCompleteChipConfiguration;

	@Input()
	titleKey: String;

	@Input()
	subtitleKey: String;

	@Input()
	delay: number = 700;

	@Input()
	placeholder: String;

	filteredItems: any[];

	@Input()
	required: boolean;

	@Input()
	disabled: boolean = false;

	// @Input() selectedDropdownItem: AutoCompleteItem;
	// @Output() selectedDropdownItemChange = new EventEmitter<AutoCompleteItem>();

	// @Output()
	// output: EventEmitter<AutoCompleteItem> = new EventEmitter<AutoCompleteItem>();

	@Input() control: FormControl;

	// @Input() createNew = false;
	// //term = new FormControl();
	// @Input()
	// ClickFunctionCall: Function;

	loading = false;
	hasSelectedItem = false;

	selectedItems: any[] = [];

	constructor() {

	}

	ngOnInit() {

		const valueChanges = this.control.valueChanges.share();
		valueChanges.subscribe(searchTerm => {
			if (this.hasSelectedItem) { //proswrina epeidh ta projects den eixan ids...gia test!!!
				this.resetFormControlValue();
			} else {
				this.loading = true;
			}
		});
		valueChanges
			.debounceTime(this.delay)
			.distinctUntilChanged()
			.switchMap(val => {
				if (this.hasSelectedItem) {
					this.loading = false;
					return [];
				} else if (typeof(val)== "string") {
					this.configuration.requestItem.criteria.like = val;
					return this.configuration.callback(this.configuration.requestItem).map(result => {
						this.filteredItems = (<any[]>result)
						this.loading = false;
					})
				}

			}).subscribe()
	}

	resetFormControlValue() {
		this.hasSelectedItem = false;
		//this.control.setValue(null, { emitEvent: false });
	}

	// // listingItemToDropDown(item: DropdownListingItem): AutoCompleteItem {
	// // 	return (item as DropdownListingItem).toDropdownList();
	// // }

	optionSelected(event: any) {
		this.hasSelectedItem = true;
		this.selectedItems.push(event.option.value)
		this.control.setValue(this.selectedItems, { emitEvent: false });
		this.filteredItems = this.selectedItems;

		//this.selectedDropdownItemChange.emit(event.option.value);
		//this.form.updateValueAndValidity();
		//this.options = [event.option.value];
		//this.loading = false;
	}
	remove(item:any){
		// this.selectedItems.filter(function(selitem){
		// 	return selitem.id != item.id;
		// });
		const index: number = this.selectedItems.indexOf(item);
		if (index !== -1) {
			this.selectedItems.splice(index, 1);
		}		
		this.control.setValue(this.selectedItems);

		if(this.selectedItems.length == 0) this.hasSelectedItem = false;
	}
	// inputOnChange(term: string) {
	// 	//this.form.patchValue({ value: null, description: '', text: '' });
	// 	//this.form.updateValueAndValidity();
	// 	this.configuration.criteria.like = term;
	// 	this.configuration.callback(this.configuration.criteria)
	// 		.map((res: any) => this.mapper(res))
	// 		.subscribe(
	// 		(res: AutoCompleteItem[]) => {
	// 			this.options = res;
	// 		},
	// 		null,
	// 		() => { this.loading = false });
	// }

	displayWith(value: any): String {
		if (!value) return '';
		if (value.lenght) {
			value.forEach(element => {
				element['' + this.titleKey];
			});
			return value;
		}
		else return value['' + this.titleKey];

	}
	// displayFn(item: AutoCompleteItem): string {
	// 	return item.text ? item.text : '';
	// }

	//fieldHasErrors(control: FormControl, form: FormGroupDirective | NgForm): boolean {
	//    return this.errorStateMatcher(control, form);
	// }
}

export class AutoCompleteErrorStateMatcher implements ErrorStateMatcher {
	isErrorState(control: FormControl | null, form: FormGroupDirective | NgForm | null): boolean {
		const isFormSubmitted = form && form.submitted;
		const isControlInvalid = control && control.invalid && (control.dirty || control.touched || isFormSubmitted);
		const isFormInvalid = form && form.enabled && form.invalid && (form.dirty || form.touched || isFormSubmitted)
		return !!(isControlInvalid || isFormInvalid);
	}
}