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

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

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

import {GeoJSON,WKT} from 'ol/format';
import {Feature} from 'ol';
import { getCenter,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 { IItem } from '@farmmaps/common';
import { FolderService, ItemService } from '@farmmaps/common';
import { tassign } from 'tassign';

import {FeatureIconService} from '../services/feature-icon.service';

import * as style from 'ol/style';

import { ItemTypeService,IQueryState } from '@farmmaps/common';


@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$.select(commonReducers.selectGetRootItems)),
    switchMap(([action, rootItems]) => {
      let actions=[];
      for (let rootItem of rootItems) {
        if (rootItem.itemType == "UPLOADS_FOLDER") actions.push(new mapActions.SetParent(rootItem.code));
      }
      // initialize default feature styles
      actions.push(new mapActions.SetStyle('file',new style.Style({
        image: new style.Icon({
            anchor: [0.5, 1],
            scale: 0.05,
          src: this.featureIconService$.getIconImageDataUrl("fa fa-file-o")
        }),
        stroke: new style.Stroke({
          color: 'red',
          width: 1
        }),
        fill: new style.Fill({
          color: 'rgba(0, 0, 255, 0.1)'
        })
      })));
      actions.push(new mapActions.SetStyle('selected',new style.Style({
        image: new style.Icon({
          anchor: [0.5, 1],
          scale: 0.08,
          src: this.featureIconService$.getIconImageDataUrl(null)
        }),
        stroke: new style.Stroke({
          color: 'red',
          width: 3
        }),
        fill: new style.Fill({
          color: 'rgba(0, 0, 255, 0.1)'
        })
      })));

      return actions;
    }
    ));

  @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()
  startSearch$: Observable<Action> = this.actions$.pipe(
    ofType(mapActions.STARTSEARCH),
    switchMap((action) => {
      let a = action as mapActions.StartSearch;
      var startDate = a.queryState.startDate;
      var endDate = a.queryState.endDate;
      var newAction:Observable<Action>;
      if (a.queryState.itemCode || a.queryState.parentCode || a.queryState.itemType || a.queryState.query || a.queryState.tags) {
        newAction= this.itemService$.getFeatures(a.queryState.bbox, "EPSG:3857", a.queryState.query, a.queryState.tags, startDate, endDate, a.queryState.itemType, a.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), a.queryState));
          }
          ),
          catchError(error => of(new commonActions.Fail(error))));
      } else {
        return [];
      }
      return newAction;
    }));


  @Effect()
  zoomToExtent$: Observable<Action> = this.actions$.pipe(
    ofType(mapActions.STARTSEARCHSUCCESS),
    mergeMap((action: mapActions.StartSearchSuccess) => {
      let actions =[];
      actions.push(new commonActions.SetMenuVisible(false));
      let extent = createEmpty();
      if (!action.query.bboxFilter) {
         if (extent) {
          for (let f of action.features) {
            extend(extent, (f as Feature).getGeometry().getExtent());
          }
          if(action.features && action.features.length >0) {
            actions.push(new mapActions.SetExtent(extent));
          }  
        }
      }
      return actions;
    }));

    @Effect()
    zoomToExtent2$: Observable<Action> = this.actions$.pipe(
      ofType(mapActions.SETFEATURES),
      map((action: mapActions.SetFeatures) => {
        let extent = createEmpty();
           if (extent) {
            for (let f of action.features) {
              extend(extent, (f as Feature).getGeometry().getExtent());
            }
          }        
        return new mapActions.SetExtent(extent);
      }));

  @Effect()
  hideMenu$: Observable<Action> = this.actions$.pipe(
    ofType(mapActions.STARTSEARCHSUCCESS),
    mergeMap((action: mapActions.StartSearchSuccess) => {
      return of(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(
            switchMap(child => {
              return this.itemService$.getItem(child.parentCode)
                .pipe(map(parent => {
                    return {child, parent};
                  }),catchError(() => { let parent:IItem = null;return of({child,parent})})
                );
            }),
            map(data => new mapActions.SelectItemSuccess(data.child, data.parent)),
            catchError(error => of(new commonActions.Fail(error))))
        } else {
          return [];
        }
      }
    ));

    @Effect()
    selectItemSuccessSetLayer$: Observable<Action> = this.actions$.pipe(
      ofType(mapActions.SELECTITEMSUCCESS),
      map((action:mapActions.SelectItemSuccess) => 
         new mapActions.SetSelectedItemLayer(action.item)
        )
      );

  @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()
    selectItemSuccessTemporal$: Observable<Action> = this.actions$.pipe(
      ofType(mapActions.SELECTITEMSUCCESS),
      switchMap((action:mapActions.SelectItemSuccess) => {
        if(action.item.itemType == "vnd.farmmaps.itemtype.temporal") {
          return this.itemService$.getChildItemList(action.item.code,null).pipe(
            map(items => new mapActions.SelectTemporalItemsSuccess(
              items.sort((a, b) =>
                 -(Date.parse(b.dataDate) - Date.parse(a.dataDate))
              )
            )),
            catchError(error => of(new commonActions.Fail(error))));
        } else {
           return [];
        }
      }
      ));

  @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()
  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(
          switchMap(child => {
            return this.itemService$.getItem(child.parentCode)
              .pipe(map(parent => {
                  return {child, parent};
                })
              );
          }),
          map(data => new mapActions.SelectItemSuccess(data.child, data.parent)),
          catchError(error => of(new commonActions.Fail(error))));
      } else {
        return [];
      }
    }));

  getActionFromQueryState(queryState:IQueryState, inSearch:boolean):Observable<Action>|[] {
    if(!inSearch && (queryState.itemType || queryState.parentCode || queryState.itemCode || queryState.query || queryState.tags)) {
      var newAction:Action;
      if (queryState.itemCode && queryState.itemCode != "") {
        newAction= new mapActions.SelectItem(queryState.itemCode);
      } else {
        newAction= new mapActions.StartSearch(queryState);
      }
      
    } else {
      newAction = new mapActions.Clear();
    }
    return of(newAction);
  }

  @Effect()
  setState$: Observable<Action> = this.actions$.pipe(
    ofType(mapActions.SETSTATE),
    withLatestFrom(this.store$.select(mapReducers.selectGetInSearch)),
    switchMap(([action,inSearch]) => {
      let a = action as mapActions.SetState;
      return this.getActionFromQueryState(a.queryState,inSearch);
    }));

    @Effect()
    escape$:Observable<Action> = this.actions$.pipe(
      ofType(commonActions.ESCAPE),
      switchMap((action) => {
        let a = action as commonActions.Escape;
        if(a.escapeKey) {
          return of(new mapActions.Clear());
        } else {
          return EMPTY;
        }       
      }));

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