import { Injectable } from '@angular/core';

import { ToastrService } from 'ngx-toastr';
import { Effect, Actions, ofType } from '@ngrx/effects';
import {Action, Store} from '@ngrx/store';
import { of } from 'rxjs';
import { map, tap, switchMap, withLatestFrom, catchError } from 'rxjs/operators';

import * as coneSearchActions from './cone-search.action';
import * as fromRouter from '@ngrx/router-store';
import * as fromConeSearch from './cone-search.reducer';
import * as utils from '../../utils';
import { ConeSearchService } from './cone-search.service';
import {FormControl, Validators} from "@angular/forms";
import {nanValidator, rangeValidator} from "../../validator";


@Injectable()
export class ConeSearchEffects {
    constructor(
        private actions$: Actions,
        private coneSearchService: ConeSearchService,
        private toastr: ToastrService,
        private store$: Store<{
            router: fromRouter.RouterReducerState<utils.RouterStateUrl>,
            search: fromConeSearch.State
        }>
    ) { }

    @Effect()
    retrieveCoordinatesAction$ = this.actions$.pipe(
        ofType(coneSearchActions.RETRIEVE_COORDINATES),
        withLatestFrom(this.store$),
        switchMap(([action, state]) => {
            const retrieveCoordinatesAction = action as coneSearchActions.RetrieveCoordinatesAction;
            return this.coneSearchService.retrieveCoordinates(retrieveCoordinatesAction.payload).pipe(
                map((response) => {
                    const parser = new DOMParser();
                    const xml = parser.parseFromString(response,'text/xml');
                    if (xml.getElementsByTagName('Resolver').length === 0) {
                        const name = xml.getElementsByTagName('name')[0].childNodes[0].nodeValue;
                        return new coneSearchActions.RetrieveCoordinatesFailAction(name);
                    }
                    const name = xml.getElementsByTagName('name')[0].childNodes[0].nodeValue;
                    const ra = +xml.getElementsByTagName('jradeg')[0].childNodes[0].nodeValue;
                    const dec = +xml.getElementsByTagName('jdedeg')[0].childNodes[0].nodeValue;
                    return new coneSearchActions.RetrieveCoordinatesSuccessAction({name, ra, dec});
                }),
                catchError(() => of(new coneSearchActions.RetrieveCoordinatesFailAction(null)))
            );
        })
    );

    @Effect({ dispatch: false })
    retrieveCoordinatesFailAction$ = this.actions$.pipe(
        ofType(coneSearchActions.RETRIEVE_COORDINATES_FAIL),
        tap(action => {
            const retrieveCoordinatesFailAction = action as coneSearchActions.RetrieveCoordinatesFailAction;
            if (retrieveCoordinatesFailAction.payload) {
                this.toastr.error(retrieveCoordinatesFailAction.payload + ' not found');
            } else {
                this.toastr.error('Connection to Sesame Name Resolver failed', 'Resolver Failed!');
            }
        })
    );

    @Effect()
    addConeSearchFromUrlAction$ = this.actions$.pipe(
        ofType(coneSearchActions.ADD_CONE_SEARCH_FROM_URL),
        switchMap(action => {
            const addConeSearchFromUrlAction = action as coneSearchActions.AddConeSearchFromUrlAction;
            let raForm = new FormControl('', [Validators.required, nanValidator, rangeValidator(0, 360)]);
            raForm.setValue(addConeSearchFromUrlAction.payload.ra);
            let decForm = new FormControl('', [Validators.required, nanValidator, rangeValidator(-90, 90)]);
            decForm.setValue(addConeSearchFromUrlAction.payload.dec);
            let radiusForm = new FormControl('', [Validators.required, nanValidator, rangeValidator(0, 150)]);
            radiusForm.setValue(addConeSearchFromUrlAction.payload.radius);
            if (!raForm.errors && !decForm.errors && !radiusForm.errors) {
                const actions: Action[] = [];
                actions.push(new coneSearchActions.AddConeSearchAction(addConeSearchFromUrlAction.payload));
                actions.push(new coneSearchActions.IsValidConeSearchAction(true));
                return actions;
            } else {
                this.toastr.error('Cone search from URL is not valid', 'Not valid position!');
                return of();
            }
        })
    );
}