import { Injectable, Inject } from '@angular/core';
import { Router } from '@angular/router';

import { Store, Action } from '@ngrx/store';
import { Effect, Actions,ofType } from '@ngrx/effects';

import { Observable ,  of } from 'rxjs';
import { withLatestFrom, switchMap, map, catchError, mergeMap, delay} from 'rxjs/operators';

import {GeoJSON,WKT} from 'ol/format';
import {Feature} from 'ol';
import { getCenter, Extent, createEmpty, extend} from 'ol/extent';
import {Point} from 'ol/geom'


import * as mapActions from '../actions/map.actions';
import * as mapReducers from '../reducers/map.reducer';
import {commonReducers} from '@farmmaps/common';

import {commonActions} from '@farmmaps/common';

import { IListItem, IItem } from '@farmmaps/common';
import { FolderService, ItemService } from '@farmmaps/common';
import { tassign } from 'tassign';

@Injectable()
export class MapEffects {
  private _geojsonFormat: GeoJSON;
  private _wktFormat: WKT;

  private toPointFeature(updateEvent:commonActions.DeviceUpdateEvent): Feature {
    var f = this._wktFormat.readFeature(updateEvent.attributes["geometry"],{
      dataProjection: 'EPSG:4326',
      featureProjection: 'EPSG:3857'
    });
    f.setId(updateEvent.itemCode);
    var centroid = getCenter(f.getGeometry().getExtent());
    f.setGeometry(new Point(centroid));
    return f;
  }

  @Effect()
  init$: Observable<Action> = this.actions$.pipe(
    ofType(mapActions.INIT),
    withLatestFrom(this.store$.select(commonReducers.selectGetRootItems)),
    switchMap(([action, rootItems]) => {
      for (let rootItem of rootItems) {
        if (rootItem.itemType == "UPLOADS_FOLDER") return of(new mapActions.SetParent(rootItem.code));
      }
      return [];
    }
    ));

  @Effect()
  initBaseLayers$: Observable<Action> = this.actions$.pipe(
    ofType(mapActions.INIT),
    withLatestFrom(this.store$.select(mapReducers.selectGetProjection)),
    map(([action, projection]) => new mapActions.LoadBaseLayers(projection)));

  @Effect()
  loadBaseLayers$: Observable<Action> = this.actions$.pipe(
    ofType(mapActions.LOADBASELAYERS),
    switchMap((action: mapActions.LoadBaseLayers) => {
      return this.itemService$.getItemList("vnd.farmmaps.itemtype.layer", { "isBaseLayer": true }).pipe(
        map((items: IItem[]) => new mapActions.LoadBaseLayersSuccess(items)),
        catchError(error => of(new commonActions.Fail(error))));
    }));

  @Effect()
  initRootItems$: Observable<Action> = this.actions$.pipe(
    ofType(commonActions.INITROOTSUCCESS),
    map((action) => new mapActions.Init()
    ));

  @Effect()
  startSearch$: Observable<Action> = this.actions$.pipe(
    ofType(mapActions.STARTSEARCH),
    switchMap((action: mapActions.StartSearch) => {
      console.debug("Start search");
      var startDate = action.queryState.startDate;
      var endDate = action.queryState.endDate;    
      var newAction:Observable<Action>;
      if (action.queryState.itemCode || action.queryState.parentCode || action.queryState.itemType || action.queryState.query || action.queryState.tags) {
        newAction= this.itemService$.getFeatures(action.queryState.bbox, "EPSG:3857", action.queryState.query, action.queryState.tags, startDate, endDate, action.queryState.itemType, action.queryState.parentCode).pipe(
          switchMap((features: any) => {
            for (let f of features.features) {
              if (f.properties && f.properties["code"]) {
                f.id = f.properties["code"];
              }
            }
            return of(new mapActions.StartSearchSuccess(this._geojsonFormat.readFeatures(features), action.queryState));
          }
          ),
          catchError(error => of(new commonActions.Fail(error))));
      } else {
        newAction=  of(new commonActions.Escape(true,false));
      }     
      return newAction;
    }));


  @Effect()
  startSearchSucces$: Observable<Action> = this.actions$.pipe(
    ofType(mapActions.STARTSEARCHSUCCESS),
    mergeMap((action: mapActions.StartSearchSuccess) => {
      if (action.query.bboxFilter) {
        return [new commonActions.SetMenuVisible(false)];
      } else { 
      var extent = createEmpty();

      if (extent) {
        for (let f of action.features) {
          extend(extent, (f as Feature).getGeometry().getExtent());
        }
      }
      //return [];
      return [new mapActions.SetExtent(extent),new commonActions.SetMenuVisible(false)];
    }
    }));

  @Effect()
  selectItem$: Observable<Action> = this.actions$.pipe(
    ofType(mapActions.SELECTITEM),
    withLatestFrom(this.store$.select(mapReducers.selectGetSelectedItem)),
      switchMap(([action, selectedItem]) => {
        let a = action as mapActions.SelectItem;
        let itemCode = selectedItem ? selectedItem.code : "";
        if (a.itemCode != itemCode) {
          return this.itemService$.getItem(a.itemCode).pipe(
            map((item: IItem) => new mapActions.SelectItemSuccess(item)),
            catchError(error => of(new commonActions.Fail(error))))
        } else {
          return [];
        }
      }
    ));

  @Effect()
  selectItemSuccess$: Observable<Action> = this.actions$.pipe(
    ofType(mapActions.SELECTITEMSUCCESS),
    switchMap((action:mapActions.SelectItemSuccess) => {
      return this.itemService$.getFeature(action.item.code, "EPSG:3857").pipe(
        map((feature: any) => {
          let f = this._geojsonFormat.readFeature(feature);
          f.setId(action.item.code);
          return new mapActions.AddFeatureSuccess(f );
        }),
        catchError(error => of(new commonActions.Fail(error))));
    }
    ));

  @Effect()
  uploadedItemClick$: Observable<Action> = this.actions$.pipe(
      ofType(commonActions.UPLOADEDFILECLICK),
      switchMap((action: commonActions.UploadedFileClick) => of(new mapActions.DoQuery(tassign(mapReducers.initialState.query, {itemCode:action.itemCode})))
    ));

  //@Effect()
  //itemAdded$: Observable<Action> = this.actions$.pipe(
  //  ofType(commonActions.ITEMADDEDEVENT),
  //  withLatestFrom(this.store$.select(mapReducers.selectGetParentCode)),
  //  mergeMap(([action, parentCode]) => {
  //    let itemAddedAction = action as commonActions.ItemAddedEvent;
  //    if (parentCode && itemAddedAction.attributes["parentCode"] == parentCode) {
  //      return this.itemService$.getFeature(itemAddedAction.itemCode,"EPSG:3857").pipe(
  //        map((feature: Feature) => new mapActions.AddFeatureSuccess(this.toPointFeature(feature))),
  //        catchError(error => of(new commonActions.Fail(error))))
  //    } else
  //      return [
  //      ];
  //  }));

  @Effect()
  featureUpdate$: Observable<Action> = this.actions$.pipe(
    ofType(commonActions.DEVICEUPDATEEVENT),
    withLatestFrom(this.store$.select(mapReducers.selectGetFeatures)),
    mergeMap(([action, features]) => {
      let deviceUpdateEventAction = action as commonActions.DeviceUpdateEvent;
      var feature: Feature = null;
      for (let f of features) {
        if (f.getId() == deviceUpdateEventAction.itemCode) {
          feature = f;
          break;
        }
      }     
      if (feature) {
        return of(new mapActions.UpdateFeatureSuccess(this.toPointFeature(deviceUpdateEventAction)));        
      } else {
        return [];
      }
    }));

  @Effect()
  itemUpdate$: Observable<Action> = this.actions$.pipe(
    ofType(commonActions.ITEMCHANGEDEVENT),
    withLatestFrom(this.store$.select(mapReducers.selectGetSelectedItem)),
    mergeMap(([action, selectedItem]) => {
      let itemChangedAction = action as commonActions.ItemChangedEvent;   
      if (selectedItem && selectedItem.code == itemChangedAction.itemCode) {
        return this.itemService$.getItem(itemChangedAction.itemCode).pipe(
          map((item: IItem) => new mapActions.SelectItemSuccess(item)),
          catchError(error => of(new commonActions.Fail(error))));
      } else {
        return [];
      }
    }));

  @Effect()
  setQueryState$: Observable<Action> = this.actions$.pipe(
    ofType(mapActions.SETQUERYSTATE),
    switchMap((action: mapActions.SetQueryState) => {
        var newAction:Action;
        if (action.queryState.itemCode && action.queryState.itemCode != "") {
          newAction= new mapActions.SelectItem(action.queryState.itemCode);
        } else {
          newAction= new mapActions.StartSearch(action.queryState);
        }
        return of(newAction);
      }));

  @Effect()
  setState$: Observable<Action> = this.actions$.pipe(
    ofType(mapActions.SETSTATE),
    switchMap((action: mapActions.SetState) => {
      var newAction:Action;
      if (action.queryState.itemCode && action.queryState.itemCode != "") {
        newAction=  new mapActions.SelectItem(action.queryState.itemCode);
      } else {
        newAction=  new mapActions.StartSearch(action.queryState);
      }
      return of(newAction);
    }));

  constructor(private actions$: Actions, private store$: Store<mapReducers.State>, private folderService$: FolderService, private itemService$: ItemService) {
    this._geojsonFormat = new GeoJSON();
    this._wktFormat = new WKT();
  }
}