import { PagedArrayCollection, CollectionEvent } from './../../../../index';

export class MovieDataProvider extends PagedArrayCollection<any> {
    // http://www.omdbapi.com/?s=Star&y=2016&plot=short&r=json&page=2
    totalResults = 0;
    pagesLoaded = 0;
    loading: boolean = false;

    constructor(source: Array<any> = []) {
        super(source);
        this.refresh();
    }

    isLoading(): boolean {
        return this.loading;
    }

    get total() {
        return this.totalResults;
    }

    get filter(): any {
        return this._filter;
    }

    set filter(value: any) {
        this._filter = value;
        this.pagesLoaded = 0;
        this.removeAll();
        this.refresh();
    }

    get sort(): Array<any> {
        return this._sort;
    }

    set sort(value: Array<any>) {
        this._sort = value;
        this.pagesLoaded = 0;
        this.removeAll();
        this.refresh();
    }

    loadMore() {
        if (this.filter && this.needMore()) {
            this.pagesLoaded++;
            let year = this.filter.Year || '';
            let search = this.filter.Title || 'Star';
            let type = (this.filter.Type) ? this.filter.Type : '';
            return fetch(`http://www.omdbapi.com/?s=${search}&y=${year}&type=${type}&plot=short&r=json&page=${this.pagesLoaded}`)
                .then(response => response.json())
                .then((r: any) => {
                    this.addItems(r.Search);
                    this.totalResults = r.totalResults;
                    return this.loadMore();
                });
        }
        let start = (this.page - 1) * this.pageSize;
        let end = start + this.pageSize;
        let result = this.source.slice(start, end);
        this.loading = false;
        return Promise.resolve(result);
    }

    needMore(): boolean {
        let recordsNeeded = this.page * this.pageSize;
        return (this.source.length < recordsNeeded);
    }

    refresh() {
        this.loading = true;
        this.filterData = this.source.slice();
        setTimeout(() => {
            this.loadMore().then((results: Array<any>) => {
                this.onDataChange(new CollectionEvent(CollectionEvent.CHANGE, results));
            });
        }, 1000);
    }
}