// NG2
import { Component, EventEmitter, forwardRef, Input, Output } from '@angular/core';
import { NG_VALUE_ACCESSOR, ControlValueAccessor } from '@angular/forms';
// APP
import { Helpers } from '../../utils/Helpers';

// Value accessor for the component (supports ngModel)
const RADIO_VALUE_ACCESSOR = {
    provide: NG_VALUE_ACCESSOR,
    useExisting: forwardRef(() => NovoRadioElement),
    multi: true
};

@Component({
    selector: 'novo-radio-group',
    template: '<ng-content></ng-content>'
})
export class NovoRadioGroup { }

@Component({
    selector: 'novo-radio',
    providers: [RADIO_VALUE_ACCESSOR],
    template: `
        <input [name]="name" type="radio" [checked]="checked" [attr.id]="name" #radio (change)="select($event, radio)">
        <label [attr.for]="name" (click)="select($event, radio)">
            <button *ngIf="button" [ngClass]="{'unchecked': !radio.checked, 'checked': radio.checked, 'has-icon': !!icon}" [theme]="theme" [icon]="icon">{{ label }}</button>
            <div *ngIf="!button">
                <i [ngClass]="{'bhi-radio-empty': !radio.checked, 'bhi-radio-filled': radio.checked}"></i>
                {{ label }}
                <ng-content></ng-content>
            </div>
        </label>
    `,
    host: {
        '[class.vertical]': 'vertical'
    }
})
export class NovoRadioElement implements ControlValueAccessor {
    @Input() name: string;
    @Input() value: any;
    @Input() checked: boolean;
    @Input() vertical: boolean;
    @Input() label: string;
    @Input() button: boolean = false;
    @Input() theme: string = 'secondary';
    @Input() icon: string;

    @Output() change: EventEmitter<any> = new EventEmitter();

    model: any;
    onModelChange: Function = () => {
    };
    onModelTouched: Function = () => {
    };

    /**
     * Handles the select of the radio button, will only change if a new radio is selected
     * @param event
     * @param radio
     */
    select(event, radio) {
        Helpers.swallowEvent(event);
        // Only change the checked state if this is a new radio, they are not toggle buttons
        if (!radio.checked) {
            radio.checked = !radio.checked;
            this.change.emit(this.value);
            this.onModelChange(this.value);
        }
    }

    writeValue(model: any): void {
        this.model = model;
    }

    registerOnChange(fn: Function): void {
        this.onModelChange = fn;
    }

    registerOnTouched(fn: Function): void {
        this.onModelTouched = fn;
    }
}