import {
  AfterViewInit, ChangeDetectorRef,
  Component,
  ElementRef,
  EventEmitter,
  HostListener,
  Input,
  OnChanges,
  OnDestroy,
  OnInit,
  Output,
  SimpleChanges,
  ViewChild
} from "@angular/core";
import {AbstractControl, FormArray, FormControl, ValidatorFn} from "@angular/forms";
import {HelperFunctions} from "../../utils/HelperFunctions.class";
import {Subscription} from "rxjs";
import {EnvProperties} from "../../utils/properties/env-properties";
import {properties} from "../../../../environments/environment";
import {ClickEvent} from "../../utils/click/click-outside-or-esc.directive";

export type InputType = 'text' | 'URL' | 'logoURL' | 'autocomplete' | 'autocomplete_soft' | 'textarea' | 'select' | 'chips';

export interface Option {
  icon?: string,
  iconClass?: string,
  value: any,
  label: string,
  disabled?: boolean
}

export interface Placeholder {
  label: string,
  static?: boolean
}

declare var UIkit;

/**
 * WARNING! dashboard-input selector is @deprecated, use input instead
 *
 * Autocomplete soft allows values that are not listed in options list. In order to work as expected
 * avoid providing options with different label and value.
 *
 * */
@Component({
  selector: '[dashboard-input], [input]',
  template: `
    <div [id]="id">
      <div class="input-wrapper" [class.disabled]="formControl.disabled" [class.opened]="opened"
           [class.focused]="focused" [ngClass]="inputClass" [class.hint]="hint"
           [class.active]="(formAsControl?.value || type === 'select' || formAsArray?.length > 0 || getLabel(formAsControl?.value)) && !focused"
           [class.danger]="(formControl.invalid && (formControl.touched || searchControl?.touched)) || (searchControl?.invalid && searchControl?.touched)">
        <div #inputBox class="input-box" [class.select]="type === 'select'" click-outside-or-esc
             [class.static]="placeholderInfo?.static" (clickOutside)="click($event)">
          <div *ngIf="!placeholderInfo?.static && placeholderInfo.label" class="placeholder">
            <label>{{placeholderInfo.label}} <sup *ngIf="required">*</sup></label>
          </div>
          <div class="uk-flex" [class.uk-flex-middle]="type !== 'textarea'">
            <ng-template [ngIf]="type === 'text' || type === 'URL' || type === 'logoURL'">
              <input #input class="input" [attr.placeholder]="placeholderInfo?.static?placeholderInfo.label:hint"
                     [formControl]="formAsControl" [class.uk-text-truncate]="!focused">
            </ng-template>
            <ng-template [ngIf]="type === 'textarea'">
              <textarea #textArea class="input" [attr.placeholder]="placeholderInfo?.static?placeholderInfo.label:hint"
                        [rows]="rows" [formControl]="formAsControl"></textarea>
            </ng-template>
            <ng-template [ngIf]="type === 'select'">
              <ng-container *ngIf="placeholderInfo?.static">
                <div *ngIf="!getLabel(formControl.value)" class="placeholder uk-text-truncate">{{placeholderInfo.label}}</div>
                <div *ngIf="getLabel(formControl.value)" class="input uk-text-truncate">{{getLabel(formControl.value)}}</div>
              </ng-container>
              <ng-container *ngIf="!placeholderInfo?.static">
                <div *ngIf="!getLabel(formControl.value)" class="input uk-text-truncate">No value selected</div>
                <div *ngIf="getLabel(formControl.value)" class="input uk-text-truncate">{{getLabel(formControl.value)}}</div>
              </ng-container>
            </ng-template>
            <ng-template [ngIf]="type === 'autocomplete'">
              <input *ngIf="focused" [attr.placeholder]="placeholderInfo?.static?placeholderInfo.label:hint"
                     #searchInput class="input" [formControl]="searchControl" [class.uk-text-truncate]="!focused">
              <div *ngIf="!focused" class="input">{{getLabel(formAsControl.value)}}</div>
            </ng-template>
            <ng-template [ngIf]="type === 'autocomplete_soft'">
              <input #input class="input" [attr.placeholder]="placeholderInfo?.static?placeholderInfo.label:hint"
                     [formControl]="formAsControl" [class.uk-text-truncate]="!focused">
            </ng-template>
            <ng-template [ngIf]="type === 'chips'">
              <div class="uk-grid uk-grid-small uk-grid-row-collapse uk-width-expand" uk-grid>
                <div *ngFor="let chip of formAsArray.controls; let i=index" [class.uk-hidden]="!focused && i > 0"
                     class="chip">
                  <div class="uk-label uk-label-small uk-flex uk-flex-middle">
                    <span class="uk-text-truncate uk-width-expand">{{getLabel(chip.value)}}</span>
                    <icon (click)="remove(i, $event)" class="uk-link-text uk-margin-small-left clickable" [flex]="true"
                          name="close" ratio="0.7"></icon>
                  </div>
                </div>
                <div *ngIf="searchControl && (focused || formAsArray.length === 0)"
                     class="uk-width-small uk-flex uk-flex-column uk-flex-center">
                  <input #searchInput class="input" [class.search]="searchControl.value"
                         [attr.placeholder]="placeholderInfo?.static?placeholderInfo.label:hint"
                         [formControl]="searchControl" [class.uk-text-truncate]="!focused">
                </div>
                <div *ngIf="!focused && formAsArray.length > 1"
                     class="uk-width-expand uk-flex uk-flex-column uk-flex-center more">
                  + {{(formAsArray.length - 1)}} more
                </div>
              </div>
            </ng-template>
            <div
                *ngIf="(formControl.disabled && disabledIcon) || icon || (type === 'select' && selectArrow) || type === 'autocomplete'"
                class="uk-margin-left icon">
              <icon *ngIf="formControl.disabled && disabledIcon" [name]="disabledIcon" [flex]="true"></icon>
              <ng-template [ngIf]="formControl.enabled">
                <icon *ngIf="!formControl.value && icon" [name]="icon" [flex]="true"></icon>
                <icon *ngIf="!icon && type === 'select' && selectArrow" name="arrow_drop_down" [flex]="true"></icon>
                <button *ngIf="searchControl?.value && type === 'autocomplete'" class="uk-close  uk-icon"
                        (click)="resetSearch($event)">
                  <icon [flex]="true" name="close"></icon>
                </button>
              </ng-template>
            </div>
          </div>
          <div class="tools">
            <ng-content select="[tools]"></ng-content>
          </div>
        </div>
      </div>
      <div class="options uk-dropdown" *ngIf="filteredOptions && filteredOptions.length > 0 && opened" #optionBox
           uk-dropdown="pos: bottom-justify; mode: none; offset: 15; boundary-align: true;" [attr.boundary]="'#' + id">
        <ul class="uk-nav uk-dropdown-nav">
          <li *ngFor="let option of filteredOptions; let i=index"
              [class.uk-active]="(formControl.value === option.value) || selectedIndex === i"
              [attr.uk-tooltip]="(tooltip)?('title: ' + option.label + ';'):null">
            <a (click)="selectOption(option, $event)"
               [class]="option.disabled ? 'uk-disabled uk-text-muted' : ''">{{option.label}}</a>
          </li>
        </ul>
      </div>
    </div>
    <span *ngIf="formControl.invalid && formControl.touched" class="uk-text-danger">
      <span *ngIf="formControl.errors.error">{{formControl.errors.error}}</span>
      <span *ngIf="type === 'URL' || type === 'logoURL'">Please provide a valid URL (e.g. https://example.com)</span>
    </span>
    <span class="uk-text-danger uk-text-small">
      <ng-content select="[error]"></ng-content>
    </span>
    <span *ngIf="formControl.valid" class="uk-text-warning uk-text-small">
      <ng-content select="[warning]"></ng-content>
      <span *ngIf="!secure">
        <span class="uk-text-bold">Note:</span> Prefer urls like "<span class="uk-text-bold">https://</span>example.com/my-secure-image.png"
            instead of "<span class="uk-text-bold">http://</span>example.com/my-image.png".
            <span class="uk-text-bold">Browsers may not load non secure content.</span>
      </span>
    </span>
    <span class="uk-text-small">
      <ng-content select="[note]"></ng-content>
    </span>
  `
})
export class InputComponent implements OnInit, OnDestroy, AfterViewInit, OnChanges {
  private static INPUT_COUNTER: number = 0;
  /** Deprecated options*/
  /** @deprecated */
  @Input('label') label: string;
  /** @deprecated */
  @Input() extraLeft: boolean = true;
  /** @deprecated */
  @Input() gridSmall: boolean = false;
  /** @deprecated */
  @Input() hideControl: boolean = false;
  /** @deprecated */
  @Input() flex: 'middle' | 'top' | 'bottom' = 'middle';
  /** @deprecated */
  @Input() iconLeft: boolean = false;
  /** @deprecated */
  @Input() removable: boolean = true;
  /** @deprecated */
  @Input() smallChip: boolean = false;
  /** @deprecated */
  @Input() panelWidth: number = 300;
  /** @deprecated */
  @Input() panelClass: string = null;
  /** Basic information */
  @Input('formInput') formControl: AbstractControl;
  @Input('type') type: InputType = 'text';
  @Input() validators: ValidatorFn[] | ValidatorFn;
  @Input() disabled: boolean = false;
  @Input() disabledIcon: string = 'lock';
  @Input() value: any | any[];
  @Output() valueChange = new EventEmitter<any | any[]>();
  @Input() hint: string;
  /** Text */
  @ViewChild('input') input: ElementRef;
  /** Textarea options */
  @ViewChild('textArea') textArea: ElementRef;
  @Input('rows') rows: number = 3;
  /** Select | Autocomplete | chips available options */
  @Input() tooltip: boolean = false;
  @Input() selectArrow: string = 'arrow_drop_down';
  @Input() selectedIndex: number = 0;
  /** Chips && Autocomplete*/
  public filteredOptions: Option[] = [];
  public searchControl: FormControl;
  /** Use modifier's class(es) to change view of your Input */
  @Input() inputClass: string = 'inner';
  /** Icon on the input */
  @Input() icon: string = null;
  /** Chip options */
  @Input() addExtraChips: boolean = false;
  @Input() showOptionsOnEmpty: boolean = true;
  @Output() focusEmitter: EventEmitter<boolean> = new EventEmitter<boolean>();
  /** LogoUrl information */
  public secure: boolean = true;
  /** Internal basic information */
  public id: string;
  public placeholderInfo: Placeholder = {label: '', static: true};
  public required: boolean = false;
  public focused: boolean = false;
  public opened: boolean = false;
  public properties: EnvProperties = properties;
  private initValue: any;
  private optionsArray: Option[] = [];
  private subscriptions: any[] = [];
  @ViewChild('inputBox') inputBox: ElementRef;
  @ViewChild('optionBox') optionBox: ElementRef;
  @ViewChild('searchInput') searchInput: ElementRef;
  
  @Input()
  set placeholder(placeholder: string | Placeholder) {
    if (typeof placeholder === 'string') {
      this.placeholderInfo = {label: placeholder, static: false};
    } else {
      if (placeholder.static && (this.type === 'autocomplete' || this.type === 'chips' || this.hint)) {
        placeholder.static = false;
        console.debug('Static placeholder is not available in this type of input and if hint is available.');
      }
      this.placeholderInfo = placeholder;
    }
  }
  
  @Input()
  set options(options: (Option | string) []) {
    this.optionsArray = options.map(option => {
      if (typeof option === 'string') {
        return {
          label: option,
          value: option
        };
      } else {
        return option;
      }
    });
  }
  
  constructor(private elementRef: ElementRef, private cdr: ChangeDetectorRef) {
    if (elementRef.nativeElement.hasAttribute('dashboard-input') && this.properties.environment === "development") {
      console.warn("'dashboard-input' selector is deprecated; use 'input' instead.");
    }
  }
  
  @HostListener('window:keydown.arrowUp', ['$event'])
  arrowUp(event: KeyboardEvent) {
    if (this.opened) {
      event.preventDefault();
      if (this.selectedIndex > 0) {
        this.selectedIndex--;
        this.optionBox.nativeElement.scrollBy(0, -34);
      }
    }
  }
  
  @HostListener('window:keydown.arrowDown', ['$event'])
  arrowDown(event: KeyboardEvent) {
    if (this.opened) {
      event.preventDefault();
      if (this.selectedIndex < (this.filteredOptions.length - 1)) {
        this.selectedIndex++;
        this.optionBox.nativeElement.scrollBy(0, 34);
      }
    }
  }
  
  @HostListener('window:keydown.enter', ['$event'])
  enter(event: KeyboardEvent) {
    if (this.opened) {
      event.preventDefault();
      if (this.filteredOptions[this.selectedIndex]) {
        this.selectOption(this.filteredOptions[this.selectedIndex], event);
        this.open(false);
      }
    }
  }
  
  click(event: ClickEvent) {
    this.focus(!event.clicked, event);
  }
  
  ngOnInit() {
    InputComponent.INPUT_COUNTER++;
    this.id = 'input-' + InputComponent.INPUT_COUNTER;
    if (!this.formControl) {
      if (Array.isArray(this.value)) {
        this.formControl = new FormArray([]);
        this.value.forEach(value => {
          this.formAsArray.push(new FormControl(value, this.validators));
        });
      } else {
        this.formControl = new FormControl(this.value);
        this.formControl.setValidators(this.validators);
      }
      if (this.disabled) {
        this.formControl.disable();
      }
    }
  }
  
  ngAfterViewInit() {
    this.reset();
  }
  
  ngOnChanges(changes: SimpleChanges) {
    if (this.formControl) {
      if (changes.value) {
        this.formControl.setValue(this.value);
      }
      if (changes.formControl || changes.validators || changes.options) {
        this.reset();
      }
      if (changes.disabled) {
        if (this.disabled) {
          this.formControl.disable();
        } else {
          this.formControl.enable();
        }
      }
    }
  }
  
  ngOnDestroy(): void {
    this.unsubscribe();
  }
  
  get formAsControl(): FormControl {
    if (this.formControl instanceof FormControl) {
      return this.formControl;
    } else {
      return null;
    }
  }
  
  get formAsArray(): FormArray {
    if (this.formControl instanceof FormArray) {
      return this.formControl;
    } else {
      return null;
    }
  }
  
  reset() {
    this.secure = true;
    this.unsubscribe();
    this.initValue = HelperFunctions.copy(this.formControl.value);
    if (this.type === 'logoURL') {
      this.secure = (!this.initValue || this.initValue.includes('https://'));
    }
    if (this.optionsArray) {
      this.filteredOptions = this.filter('');
      this.cdr.detectChanges();
    }
    if (this.type === 'chips' || this.type === 'autocomplete') {
      if (!this.searchControl) {
        this.searchControl = new FormControl('', this.validators);
      }
      this.subscriptions.push(this.searchControl.valueChanges.subscribe(value => {
        this.filteredOptions = this.filter(value);
        this.cdr.detectChanges();
        if (this.focused) {
          this.open(true);
          setTimeout(() => {
            this.searchInput.nativeElement.focus();
            this.searchInput.nativeElement.value = value;
          }, 0);
        }
      }));
    }
    if (this.formControl.validator) {
      let validator = this.formControl.validator({} as AbstractControl);
      this.required = (validator && validator.required);
    }
    this.subscriptions.push(this.formControl.valueChanges.subscribe(value => {
      if (this.formControl.enabled) {
        value = (value === '') ? null : value;
        if (this.type === 'logoURL') {
          this.secure = (!value || value.includes('https://'));
        }
        if (this.initValue === value || (this.initValue === '' && value === null)) {
          this.formControl.markAsPristine();
        } else {
          this.formControl.markAsDirty();
        }
        if (this.type === 'autocomplete_soft') {
          this.filteredOptions = this.filter(value);
          this.cdr.detectChanges();
          if (this.focused) {
            this.open(true);
          }
        }
        if ((this.value && value && this.value !== value) || (!this.value && value) || this.value && !value) {
          this.valueChange.emit(this.formControl.value);
        }
      }
    }));
    if (this.input) {
      this.input.nativeElement.disabled = this.formControl.disabled;
    }
  }
  
  unsubscribe() {
    this.subscriptions.forEach(subscription => {
      if (subscription instanceof Subscription) {
        subscription.unsubscribe();
      }
    });
  }
  
  remove(index: number, event) {
    if (this.focused) {
      this.formAsArray.removeAt(index);
      this.formAsArray.markAsDirty();
      this.focus(true);
      this.searchControl.setValue('');
      event.stopPropagation();
    }
  }
  
  private filter(value: string): Option[] {
    let options = this.optionsArray;
    if (this.type === "chips") {
      options = options.filter(option => !this.formAsArray.value.find(value => HelperFunctions.equals(option.value, value)));
    }
    if ((!value || value.length == 0)) {
      this.selectedIndex = 0;
      return (this.showOptionsOnEmpty) ? options : [];
    }
    const filterValue = value.toString().toLowerCase();
    options = options.filter(option => option.label.toLowerCase().indexOf(filterValue) != -1);
    this.selectedIndex = options.findIndex(option => option.value === this.formControl.value);
    if (this.selectedIndex === -1) {
      this.selectedIndex = 0;
    }
    return options;
  }
  
  add(event) {
    if (this.addExtraChips && this.searchControl.value && this.searchControl.valid) {
      if (event) {
        event.stopPropagation();
      }
      this.formAsArray.push(new FormControl(this.searchControl.value, this.validators));
      this.formAsArray.markAsDirty();
    }
    this.searchControl.setValue('');
  }
  
  getLabel(value: any) {
    let option = this.filteredOptions.find(option => HelperFunctions.equals(option.value, value));
    return (option) ? option.label : (value);
  }
  
  focus(value: boolean, event = null) {
    if (this.focused) {
      this.formControl.markAsTouched();
    }
    this.focused = value;
    this.cdr.detectChanges();
    if (this.focused) {
      if (this.input) {
        this.input.nativeElement.focus();
      } else if (this.textArea) {
        this.textArea.nativeElement.focus();
      } else if (this.searchInput) {
        this.searchInput.nativeElement.focus();
      }
      if (this.type === 'select') {
        this.open(!this.opened);
      } else if (this.type !== 'autocomplete' || !this.formControl.value) {
        this.open(true);
      }
    } else {
      this.open(false);
      if (this.input) {
        this.input.nativeElement.blur();
      } else if (this.textArea) {
        this.textArea.nativeElement.blur();
      } else if (this.searchInput) {
        this.searchInput.nativeElement.blur();
      }
      if (this.searchControl) {
        this.add(event);
      }
    }
    this.focusEmitter.emit(this.focused);
  }
  
  open(value: boolean) {
    this.opened = value && this.formControl.enabled;
    this.cdr.detectChanges();
    if (this.optionBox) {
      if (this.opened) {
        this.selectedIndex = this.filteredOptions.findIndex(option => option.value === this.formControl.value);
        if (this.selectedIndex === -1) {
          this.selectedIndex = 0;
        }
        UIkit.dropdown(this.optionBox.nativeElement).show();
      } else {
        UIkit.dropdown(this.optionBox.nativeElement).hide();
      }
    }
  }
  
  resetSearch(event: any) {
    event.stopPropagation();
    this.searchControl.setValue('');
  }
  
  selectOption(option: Option, event) {
    if (this.formControl.enabled) {
      if (this.formAsControl) {
        this.formAsControl.setValue(option.value);
      } else if (this.formAsArray) {
        this.formAsArray.push(new FormControl(option.value));
        this.formAsArray.markAsDirty();
        event.stopPropagation();
        this.focus(true);
        this.searchControl.setValue('');
      }
    }
  }
}