import { Component, Input, OnInit } from '@angular/core';
import { AbstractControl } from '@angular/forms';

import { JsonSchemaFormService } from '../../library/json-schema-form.service';
import { getControl, inArray, isDefined } from '../../library/utilities/index';

@Component({
  selector: 'material-number-widget',
  template: `
    <section [class]="options?.htmlClass">
      <md-input #inputControl
        [attr.aria-describedby]="'control' + layoutNode?._id + 'Status'"
        [attr.max]="options?.maximum"
        [attr.min]="options?.minimum"
        [attr.placeholder]="options?.placeholder"
        [required]="options?.required"
        [attr.readonly]="options?.readonly ? 'readonly' : null"
        [attr.step]="options?.multipleOf || options?.step || 'any'"
        [class]="options?.fieldHtmlClass"
        [disabled]="controlDisabled"
        [id]="'control' + layoutNode?._id"
        [name]="controlName"
        [placeholder]="options?.title"
        [readonly]="options?.readonly ? 'readonly' : null"
        [style.width]="'100%'"
        [title]="lastValidNumber"
        [type]="layoutNode?.type === 'range' ? 'range' : 'number'"
        [value]="controlValue"
        (input)="updateValue($event)"
        (keydown)="validateInput($event)"
        (keyup)="validateNumber($event)">
        <span *ngIf="options?.fieldAddonLeft"
          md-prefix>{{options?.fieldAddonLeft}}</span>
        <span *ngIf="options?.fieldAddonRight"
          md-suffix>{{options?.fieldAddonRight}}</span>
        <md-hint *ngIf="options?.description && !(options?.placeholder && !formControl?.dirty)"
          align="end">{{options?.description}}</md-hint>
        <md-hint *ngIf="!options?.description && options?.placeholder && !formControl?.dirty"
          align="end">{{options?.placeholder}}</md-hint>
      </md-input>
      {{layoutNode?.type === 'range' ? controlValue : ''}}
    </section>`,
    styles: [`md-input { margin-top: 6px; }`],
})
export class MaterialNumberComponent implements OnInit {
  private formControl: AbstractControl;
  private controlName: string;
  private controlValue: any;
  private controlDisabled: boolean = false;
  private boundControl: boolean = false;
  private options: any;
  private allowNegative: boolean = true;
  private allowDecimal: boolean = true;
  private allowExponents: boolean = false;
  private lastValidNumber: string = '';
  @Input() formID: number;
  @Input() layoutNode: any;
  @Input() layoutIndex: number[];
  @Input() dataIndex: number[];

  constructor(
    private jsf: JsonSchemaFormService
  ) { }

  ngOnInit() {
    this.options = this.layoutNode.options;
    this.jsf.initializeControl(this);
    if (this.layoutNode.dataType === 'integer') this.allowDecimal = false;
  }

  private updateValue(event) {
    this.jsf.updateValue(this, event.target.value);
  }

  private validateInput(event) {
    const val = event.target.value;
    if (/^Digit\d$/.test(event.code)) return true;
    if (/^Numpad\d$/.test(event.code)) return true;
    if (/^Arrow/.test(event.code)) return true;
    if (inArray(event.code, ['Backspace', 'Delete', 'Enter', 'Escape',
      'NumpadEnter', 'PrintScreen', 'Tab'])) return true;
    if (event.ctrlKey || event.altKey || event.metaKey) return true;
    if (this.allowDecimal && event.key === '.' &&
      val.indexOf('.') === -1) return true;
    if (this.allowExponents) {
      const hasExponent = /e/i.test(val);
      if (/^e$/i.test(event.key) && !hasExponent && val) return true;
      if (event.key === '-') {
        const minusCount = (val.match(/\-/g) || []).length;
        if ((this.allowNegative || hasExponent) && !minusCount) return true;
        if (this.allowNegative && hasExponent && minusCount === 1) return true;
      }
    } else if (this.allowNegative && event.key === '-' && val.indexOf('-') === -1) {
      return true;
    }
    // TODO: Display feedback for rejected keystroke,
    // and clear feedback on next valid keystroke
    return false;
  }

  private validateNumber(event) {
    // TODO: This only works for input type=text - make it work for type=number
    const val = event.target.value;
    if (!isNaN(val) || val === '' || val === '.' || val === '-' || val === '-.' ||
      (val.length > 1 && val.slice(-1).toLowerCase() === 'e') ||
      (val.length > 2 && val.slice(-2).toLowerCase() === 'e-')
    ) {
      this.lastValidNumber = val;
    } else {
      // TODO: Display feedback for rejected key
      this.jsf.getControl(this).setValue(this.lastValidNumber);
    }
  }
}