import Component from '@ember/component';
// @ts-ignore: Ignore import of compiled template
import template from './template';
import { gt } from '@ember/object/computed';
import { computed, action } from '@ember/object';

export default class UiPagination extends Component {
  layout = template;
  tagName: string = '';

  start!: number;
  count!: number;
  total!: number;
  onChangeStart!: any;

  @gt('start', 0) showPrevious!: boolean;

  @computed('start', 'count', 'total')
  get showNext(): boolean {
    return this.start + this.count < this.total;
  }

  @computed('start', 'count', 'total')
  get currentPagination(): any {
    if (this.total == 0) {
      return {
        label: '0',
      };
    }
    let max = Math.min(this.start + this.count, this.total);
    return {
      label: `${this.start + 1} - ${max} of ${this.total}`,
    };
  }

  @computed('start', 'count', 'total')
  get paginationOptions(): object[] {
    let pages: any[] = [];
    for (let i = 0; i < this.total; i += this.count) {
      let max = Math.min(i + this.count, this.total);

      pages.push({
        label: `${i + 1} - ${max}`,
        value: i,
      });
    }
    return pages;
  }

  @action
  onNext() {
    if (this.start + this.count > this.total) {
      return;
    }
    this.onChangeStart(this.start + this.count);
  }

  @action
  onPrevious() {
    if (this.start - this.count < 0) {
      return;
    }
    this.onChangeStart(this.start - this.count);
  }

  @action
  onSetPage(pageOption: any) {
    this.onChangeStart(pageOption.value);
  }
}