import { EventEmitter, Component, ChangeDetectionStrategy, ViewEncapsulation, ElementRef, Input, ContentChild, ContentChildren, ViewChild, Output, NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
import { Header, Footer, PrimeTemplate, SharedModule } from 'primeng/api';
import { CdkVirtualScrollViewport, ScrollingModule } from '@angular/cdk/scrolling';

class VirtualScroller {
    constructor(el) {
        this.el = el;
        this.trackBy = (index, item) => item;
        this.onLazyLoad = new EventEmitter();
        this._totalRecords = 0;
        this.page = 0;
        this._first = 0;
        this.loadedPages = [];
    }
    get totalRecords() {
        return this._totalRecords;
    }
    set totalRecords(val) {
        this._totalRecords = val;
        console.log("totalRecords is deprecated, provide a value with the length of virtual items instead.");
    }
    get first() {
        return this._first;
    }
    set first(val) {
        this._first = val;
        console.log("first property is deprecated, use scrollToIndex function to scroll a specific item.");
    }
    get cache() {
        return this._cache;
    }
    set cache(val) {
        this._cache = val;
        console.log("cache is deprecated as it is always on.");
    }
    ngAfterContentInit() {
        this.templates.forEach((item) => {
            switch (item.getType()) {
                case 'item':
                    this.itemTemplate = item.template;
                    break;
                case 'loadingItem':
                    this.loadingItemTemplate = item.template;
                    break;
                case 'header':
                    this.headerTemplate = item.template;
                    break;
                case 'footer':
                    this.footerTemplate = item.template;
                    break;
                default:
                    this.itemTemplate = item.template;
                    break;
            }
        });
    }
    onScrollIndexChange(index) {
        if (this.lazy) {
            let pageRange = this.createPageRange(Math.floor(index / this.rows));
            pageRange.forEach(page => this.loadPage(page));
        }
    }
    createPageRange(page) {
        let range = [];
        if (page !== 0) {
            range.push(page - 1);
        }
        range.push(page);
        if (page !== (Math.ceil(this.value.length / this.rows) - 1)) {
            range.push(page + 1);
        }
        return range;
    }
    loadPage(page) {
        if (!this.loadedPages.includes(page)) {
            this.onLazyLoad.emit({ first: this.rows * page, rows: this.rows });
            this.loadedPages.push(page);
        }
    }
    getBlockableElement() {
        return this.el.nativeElement.children[0];
    }
    //@deprecated
    scrollTo(index, mode) {
        this.scrollToIndex(index, mode);
    }
    scrollToIndex(index, mode) {
        if (this.viewport) {
            this.viewport.scrollToIndex(index, mode);
        }
    }
    clearCache() {
        this.loadedPages = [];
    }
    ngOnChanges(simpleChange) {
        if (simpleChange.value) {
            if (!this.lazy) {
                this.clearCache();
            }
        }
    }
}
VirtualScroller.decorators = [
    { type: Component, args: [{
                selector: 'p-virtualScroller',
                template: `
        <div [ngClass]="'p-virtualscroller p-component'" [ngStyle]="style" [class]="styleClass">
            <div class="p-virtualscroller-header" *ngIf="header || headerTemplate">
                <ng-content select="p-header"></ng-content>
                <ng-container *ngTemplateOutlet="headerTemplate"></ng-container>
            </div>
            <div #content class="p-virtualscroller-content">
                <div class="p-virtualscroller-list">
                    <cdk-virtual-scroll-viewport #viewport [ngStyle]="{'height': scrollHeight}" [itemSize]="itemSize" [minBufferPx]="minBufferPx" [maxBufferPx]="maxBufferPx" (scrolledIndexChange)="onScrollIndexChange($event)">
                        <ng-container *cdkVirtualFor="let item of value; trackBy: trackBy; let i = index; let c = count; let f = first; let l = last; let e = even; let o = odd;">
                            <div [ngStyle]="{'height': itemSize + 'px'}" class="p-virtualscroller-item">
                                <ng-container *ngTemplateOutlet="item ? itemTemplate : loadingItemTemplate; context: {$implicit: item, index: i, count: c, first: f, last: l, even: e, odd: o}"></ng-container>
                            </div>
                        </ng-container>
                    </cdk-virtual-scroll-viewport>
                </div>
            </div>
            <div class="p-virtualscroller-footer" *ngIf="footer || footerTemplate">
                <ng-content select="p-footer"></ng-content>
                <ng-container *ngTemplateOutlet="footerTemplate"></ng-container>
            </div>
        </div>
    `,
                changeDetection: ChangeDetectionStrategy.Default,
                encapsulation: ViewEncapsulation.None
            },] }
];
VirtualScroller.ctorParameters = () => [
    { type: ElementRef }
];
VirtualScroller.propDecorators = {
    value: [{ type: Input }],
    itemSize: [{ type: Input }],
    style: [{ type: Input }],
    styleClass: [{ type: Input }],
    scrollHeight: [{ type: Input }],
    lazy: [{ type: Input }],
    rows: [{ type: Input }],
    minBufferPx: [{ type: Input }],
    maxBufferPx: [{ type: Input }],
    trackBy: [{ type: Input }],
    header: [{ type: ContentChild, args: [Header,] }],
    footer: [{ type: ContentChild, args: [Footer,] }],
    templates: [{ type: ContentChildren, args: [PrimeTemplate,] }],
    viewport: [{ type: ViewChild, args: [CdkVirtualScrollViewport,] }],
    onLazyLoad: [{ type: Output }],
    totalRecords: [{ type: Input }],
    first: [{ type: Input }],
    cache: [{ type: Input }]
};
class VirtualScrollerModule {
}
VirtualScrollerModule.decorators = [
    { type: NgModule, args: [{
                imports: [CommonModule, ScrollingModule],
                exports: [VirtualScroller, SharedModule, ScrollingModule],
                declarations: [VirtualScroller]
            },] }
];

/**
 * Generated bundle index. Do not edit.
 */

export { VirtualScroller, VirtualScrollerModule };
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