/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
import {Component, EventEmitter, Input, OnInit, Output} from '@angular/core';
import {FormControl} from '@angular/forms';
import {Observable} from 'rxjs/Observable';

@Component({
  selector: 'fims-select-list',
  templateUrl: './select-list.component.html'
})
export class SelectListComponent implements OnInit {

  selections: string[];

  term = new FormControl();

  @Input('preSelection') set preSelection(preSelection: string | string[]) {
    preSelection = preSelection || [];
    const selections: string[] = Array.isArray(preSelection) ? preSelection : [preSelection];
    this.selections = selections;
  };

  @Input('listIcon') listIcon: string;

  @Input('noResultsMessage') noResultsMessage: string;

  @Input('noSelectionMessage') noSelectionMessage: string;

  @Input('data') data: Observable<any[]>;

  @Input('id') id: string;

  @Input('title') title: string;

  @Input('multiple') multiple = false;

  @Output() onSearch = new EventEmitter<string>();

  @Output() onSelectionChange = new EventEmitter<any>();

  constructor() {}

  ngOnInit(): void {
    this.term.valueChanges
      .debounceTime(500)
      .subscribe((event) => this.onSearch.emit(event));
  }

  doSelect(id: any): void {
    if (this.selections.indexOf(id) > -1) {
      return;
    }

    if (this.multiple) {
      this.selections.push(id);
    }else {
      this.selections = [id];
    }

    this.onSelectionChange.emit(this.selections);
  }

  doDeselect(id: any): void {
    const index = this.selections.indexOf(id);

    if (index > -1) {
      this.selections.splice(index, 1);
    }

    this.onSelectionChange.emit(this.selections);
  }
}