import { ChangeDetectionStrategy, ChangeDetectorRef, Component, OnDestroy, OnInit, ViewEncapsulation } from '@angular/core';
import { MatDrawerToggleResult } from '@angular/material/sidenav';
import { Subject } from 'rxjs';
import { takeUntil } from 'rxjs/operators';
import { FileManagerListComponent } from 'app/modules/admin/apps/file-manager/list/list.component';
import { FileManagerService } from 'app/modules/admin/apps/file-manager/file-manager.service';
import { Item } from 'app/modules/admin/apps/file-manager/file-manager.types';

@Component({
    selector       : 'file-manager-details',
    templateUrl    : './details.component.html',
    encapsulation  : ViewEncapsulation.None,
    changeDetection: ChangeDetectionStrategy.OnPush
})
export class FileManagerDetailsComponent implements OnInit, OnDestroy
{
    item: Item;
    private _unsubscribeAll: Subject<any> = new Subject<any>();

    /**
     * Constructor
     */
    constructor(
        private _changeDetectorRef: ChangeDetectorRef,
        private _fileManagerListComponent: FileManagerListComponent,
        private _fileManagerService: FileManagerService
    )
    {
    }

    // -----------------------------------------------------------------------------------------------------
    // @ Lifecycle hooks
    // -----------------------------------------------------------------------------------------------------

    /**
     * On init
     */
    ngOnInit(): void
    {
        // Open the drawer
        this._fileManagerListComponent.matDrawer.open();

        // Get the item
        this._fileManagerService.item$
            .pipe(takeUntil(this._unsubscribeAll))
            .subscribe((item: Item) => {

                // Open the drawer in case it is closed
                this._fileManagerListComponent.matDrawer.open();

                // Get the item
                this.item = item;

                // Mark for check
                this._changeDetectorRef.markForCheck();
            });
    }

    /**
     * On destroy
     */
    ngOnDestroy(): void
    {
        // Unsubscribe from all subscriptions
        this._unsubscribeAll.next();
        this._unsubscribeAll.complete();
    }

    // -----------------------------------------------------------------------------------------------------
    // @ Public methods
    // -----------------------------------------------------------------------------------------------------

    /**
     * Close the drawer
     */
    closeDrawer(): Promise<MatDrawerToggleResult>
    {
        return this._fileManagerListComponent.matDrawer.close();
    }

    /**
     * Track by function for ngFor loops
     *
     * @param index
     * @param item
     */
    trackByFn(index: number, item: any): any
    {
        return item.id || index;
    }
}