// NG2
import { Component, ElementRef, Input, OnDestroy, OnInit } from '@angular/core';
// APP
import { NovoLabelService } from '../../services/novo-label-service';

@Component({
    selector: 'novo-slider',
    template: `
        <section class="slides">
            <ng-content select="div[slide]"></ng-content>
        </section>
        <div class="controls">
            <button *ngIf="!start" theme="icon" icon="previous" (click)="changeSlide('back')"></button>
            <div class="indicators">
                <div class="indicator-circle" *ngFor="let indicator of currSlides; let i = index" [ngClass]="indicator"></div>
            </div>
            <button *ngIf="!end" theme="primary" icon="next" (click)="changeSlide('next')">{{ labels.next }}</button>
            <ng-content select="button" *ngIf="end"></ng-content>
        </div>
    `,
    host: {
        '[class]': 'currentClass'
    }
})
export class NovoSliderElement implements OnInit, OnDestroy {
    @Input() slides: any;

    currentSlide: number = 0;
    start: boolean = true;
    end: boolean = true;
    currSlides: Array<any> = ['active'];
    handleKeyDownFunc: any;
    currentClass: string;

    constructor(private element: ElementRef, public labels: NovoLabelService) {
        this.handleKeyDownFunc = this.handleKeyDown.bind(this);
    }

    ngOnInit() {
        for (let i = 0; i < this.slides; i++) {
            this.currSlides[i] = (i > 0) ? 'inactive' : 'active';
        }
        // Catch Tab Events
        this.element.nativeElement.addEventListener('keydown', this.handleKeyDownFunc);
    }

    ngOnDestroy() {
        this.element.nativeElement.removeEventListener('keydown', this.handleKeyDownFunc);
    }

    handleKeyDown(event) {
        if (event.keyCode === 9) {
            event.stopImmediatePropagation();
            event.preventDefault();
        }
    }

    changeSlide(direction) {
        if (direction === 'next') {
            if (this.currentSlide === this.slides - 1) {
                return;
            }
            this.currentSlide++;
        } else {
            if (this.currentSlide === 0) {
                return;
            }
            this.currentSlide--;
        }

        for (let i = 0; i < this.slides; i++) {
            this.currSlides[i] = 'inactive';
        }

        this.currSlides[this.currentSlide] = 'active';
        this.start = (this.currentSlide === 0);
        this.end = (this.currentSlide === this.slides - 1);
        this.currentClass = `slide-${this.currentSlide}`;
    }
}