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import { ENTER } from '@angular/cdk/keycodes';
import {
ChangeDetectionStrategy,
ChangeDetectorRef,
Component,
ElementRef,
Input,
OnChanges,
ViewChild,
} from '@angular/core';
import { ControlValueAccessor, NgControl } from '@angular/forms';
import { UntilDestroy, untilDestroyed } from '@ngneat/until-destroy';
import {
fromEvent, merge, Observable, Subject,
} from 'rxjs';
import {
debounceTime, distinctUntilChanged, startWith, switchMap,
} from 'rxjs/operators';
import { Option } from 'app/interfaces/option.interface';
import { ChipsProvider } from 'app/modules/ix-forms/components/ix-chips/chips-provider';
@UntilDestroy()
@Component({
selector: 'ix-chips',
templateUrl: './ix-chips.component.html',
styleUrls: ['./ix-chips.component.scss'],
changeDetection: ChangeDetectionStrategy.OnPush,
})
export class IxChipsComponent implements OnChanges, ControlValueAccessor {
@Input() label: string;
@Input() placeholder: string;
@Input() hint: string;
@Input() tooltip: string;
@Input() required: boolean;
@Input() allowNewEntries = true;
@Input() autocompleteProvider: ChipsProvider;
@Input() options: Observable<Option[]>;
@Input() resolveValue = false;
@ViewChild('chipInput', { static: true }) chipInput: ElementRef<HTMLInputElement>;
suggestions$: Observable<string[]>;
values: string[] = [];
isDisabled = false;
private _options: Option[] = [];
get labels(): string[] {
if (!this.resolveValue) {
return this.values;
}
return this.values?.map((value) => {
if (this.resolveValue && this._options?.length) {
return this._options.find((option) => option.value === parseInt(value))?.label;
}
return value;
}).filter(Boolean);
}
inputReset$ = new Subject<void>();
onChange: (value: string[]) => void = (): void => {};
onTouch: () => void = (): void => {};
readonly separatorKeysCodes = [ENTER];
constructor(
public controlDirective: NgControl,
private cdr: ChangeDetectorRef,
) {
this.controlDirective.valueAccessor = this;
}
ngOnChanges(): void {
this.setAutocomplete();
this.setOptions();
}
writeValue(value: string[]): void {
this.values = value;
this.cdr.markForCheck();
}
registerOnChange(onChange: (value: []) => void): void {
this.onChange = onChange;
}
registerOnTouched(onTouched: () => void): void {
this.onTouch = onTouched;
}
setDisabledState?(isDisabled: boolean): void {
this.isDisabled = isDisabled;
this.cdr.markForCheck();
}
onRemove(itemToRemove: string): void {
if (this.resolveValue && this._options?.length) {
itemToRemove = this._options.find((option) => option.label === itemToRemove)?.value.toString();
}
const updatedValues = this.values.filter((value) => String(value) !== String(itemToRemove));
this.updateValues(updatedValues);
}
onAdd(value: string): void {
let newValue = (value || '')?.trim();
if (!newValue || this.values.includes(newValue)) {
return;
}
if (this.resolveValue && this._options?.length) {
const newOption = this._options.find((option) => option.label === newValue);
if (newOption) {
newValue = newOption.value as string;
}
}
this.clearInput();
this.updateValues([...this.values, newValue]);
}
onInputBlur(): void {
if (!this.allowNewEntries) {
this.chipInput.nativeElement.value = null;
return;
}
this.onAdd(this.chipInput.nativeElement.value);
}
private setOptions(): void {
if (!this.resolveValue) {
this.options = null;
return;
}
this.options?.pipe(untilDestroyed(this)).subscribe((options) => {
this._options = options;
});
}
private setAutocomplete(): void {
if (!this.autocompleteProvider) {
this.suggestions$ = null;
return;
}
this.suggestions$ = merge(
fromEvent(this.chipInput.nativeElement, 'input')
.pipe(
startWith(''),
debounceTime(100),
distinctUntilChanged(),
),
this.inputReset$,
).pipe(
switchMap(() => {
return this.autocompleteProvider(this.chipInput.nativeElement.value);
}),
);
}
private updateValues(updatedValues: string[]): void {
this.values = updatedValues;
this.onChange(this.values);
this.onTouch();
}
private clearInput(): void {
this.chipInput.nativeElement.value = '';
this.inputReset$.next();
}
}