import { Component, OnDestroy, OnInit, Output, EventEmitter } from '@angular/core';
import { Subject } from 'rxjs';
import { ActivatedRoute } from '@angular/router';
import { QueryParam, QueryParamBuilder, QueryParamGroup } from '@ngqp/core';
import { takeUntil } from 'rxjs/operators';
import { SearchInput } from 'app/shared/model/search/search-input.model';
import { SearchService } from '../service/search-service';
import { faQuestion } from '@fortawesome/free-solid-svg-icons';

import { Observable } from 'rxjs';
import { debounceTime, distinctUntilChanged, map, switchMap } from 'rxjs/operators';

import { IExerciseType, ILanguages } from 'app/shared/model/exercise.model';

interface LooseObject {
  [key: string]: any;
}

@Component({
  selector: 'jhi-search-input',
  templateUrl: './search-input.component.html',
  styleUrls: ['./search-input.component.scss'],
})
export class SearchInputComponent implements OnInit, OnDestroy {
  private static DEBOUNCE_TIME = 200;

  @Output() searchInputEvent = new EventEmitter<SearchInput>();
  public pageSize = 4;

  typeValues = Object.keys(IExerciseType);
  languageValues = Object.keys(ILanguages);

  questionIcon = faQuestion;
  public paramGroup: QueryParamGroup;
  private componentDestroyed$ = new Subject<void>();

  public searchInput: SearchInput;

  public showSearchUsage = false;

  constructor(
    protected activatedRoute: ActivatedRoute,
    private qpb: QueryParamBuilder,
    private searchService: SearchService
  ) {
    this.searchInput = new SearchInput();

    const groupDef: LooseObject = {
      searchText: qpb.stringParam('q', {
        debounceTime: SearchInputComponent.DEBOUNCE_TIME,
        emptyOn: '',
      }),
      page: qpb.numberParam('page', {
        emptyOn: 1,
      }),
      programmingLanguage: qpb.stringParam('pl', {
        debounceTime: SearchInputComponent.DEBOUNCE_TIME,
        emptyOn: '',
      }),
      keyword: qpb.stringParam('kw', {
        debounceTime: SearchInputComponent.DEBOUNCE_TIME,
        emptyOn: '',
      }),
      format: qpb.stringParam('f', {
        debounceTime: SearchInputComponent.DEBOUNCE_TIME,
        emptyOn: '',
      }),
      author: qpb.stringParam('a', {
        debounceTime: SearchInputComponent.DEBOUNCE_TIME,
        emptyOn: '',
      }),
      license: qpb.stringParam('l', {
        debounceTime: SearchInputComponent.DEBOUNCE_TIME,
        emptyOn: '',
      }),
      parentId: qpb.stringParam('p', {
        debounceTime: SearchInputComponent.DEBOUNCE_TIME,
        emptyOn: '',
      }),
    };

    // add type checkbox support
    this.typeValues.forEach(function (type: string): void {
      const typeName = type.toString();
      groupDef[typeName] = qpb.stringParam(typeName, {
        debounceTime: SearchInputComponent.DEBOUNCE_TIME,
        emptyOn: '',
      });
    });

    // add type language checkbox support
    this.languageValues.forEach(language => {
      groupDef[language] = qpb.stringParam(language, {
        debounceTime: SearchInputComponent.DEBOUNCE_TIME,
        emptyOn: '',
      });
    });

    this.paramGroup = qpb.group(groupDef);

    this.paramGroup.valueChanges.pipe(takeUntil(this.componentDestroyed$)).subscribe(value => {
      this.searchInput.setValues(value);
      this.searchInputEvent.emit(this.searchInput);
    });
  }

  getSelectedTypes(): string[] {
    const result: string[] = [];
    this.typeValues.forEach(type => {
      if (this.paramGroup.queryParams[type].value) result.push(type);
    });
    return result;
  }

  getSelectedLanguages(): string[] {
    const result: string[] = [];
    this.languageValues.forEach(language => {
      if (this.paramGroup.queryParams[language].value) result.push(language);
    });
    return result;
  }

  ngOnInit(): void {}

  ngOnDestroy(): void {
    this.componentDestroyed$.next();
    this.componentDestroyed$.complete();
  }

  public get pageParam(): QueryParam<number> {
    return this.paramGroup.get('page') as QueryParam<number>;
  }

  public onPageChange(page: number): void {
    this.pageParam.setValue(page);
  }

  /*
  public itemSelected(): void {
          this.searchInputEvent.emit(this.searchInput);
  }
*/
  autoCompleteContributorCreator = (text$: Observable<string>) =>
    text$.pipe(
      debounceTime(200),
      distinctUntilChanged(),
      switchMap(searchText => {
        if (searchText.length <= 2) return [];
        return this.searchService.getContributorCreatorAutoComplete(searchText, 10).pipe(map(ace => ace.map(ac => ac.target)));
      })
    );

  autoCompleteKeyWords = (text$: Observable<string>) =>
    text$.pipe(
      debounceTime(200),
      distinctUntilChanged(),
      switchMap(searchText => this.searchService.getKeywordsAutoComplete(searchText, 10).pipe(map(ace => ace.map(ac => ac.target))))
    );

  autoCompleteFormats = (text$: Observable<string>) =>
    text$.pipe(
      debounceTime(200),
      distinctUntilChanged(),
      switchMap(searchText => this.searchService.getFormatsAutoComplete(searchText).pipe(map(ace => ace.map(ac => ac.target))))
    );

  autoCompleteProgrammingLanguage = (text$: Observable<string>) =>
    text$.pipe(
      debounceTime(200),
      distinctUntilChanged(),
      switchMap(searchText => this.searchService.getProgrammingLanguageAutoComplete(searchText).pipe(map(ace => ace.map(ac => ac.target))))
    );
}