Bernd-L/exDateMan

import { Injectable } from "@angular/core";
import {
  ValidatorFn,
  FormGroup,
  FormControl,
  FormGroupDirective,
  NgForm
} from "@angular/forms";
import { ErrorStateMatcher } from "@angular/material/core";

// source: https://stackoverflow.com/a/48292166/5954839

@Injectable({
  providedIn: "root"
})
export class CustomValidatorsService {
  constructor() {}

  /**
   * Validates that a formGroup's children all have the same value
   */
  static childrenEqual: ValidatorFn = (formGroup: FormGroup) => {
    const [firstControlName, ...otherControlNames] = Object.keys(
      formGroup.controls || {}
    );
    const isValid = otherControlNames.every(
      controlName =>
        formGroup.get(controlName).value ===
        formGroup.get(firstControlName).value
    );
    return isValid ? null : { childrenNotEqual: true };
  };
}

export class ConfirmValidParentMatcher implements ErrorStateMatcher {
  isErrorState(
    control: FormControl | null,
    form: FormGroupDirective | NgForm | null
  ): boolean {
    return control.parent.invalid && control.touched;
  }
}

/**
 * Collection of reusable error messages
 */
export const errorMessages: { [key: string]: string } = {
  fullName: "Full name must be between 1 and 128 characters",
  email: "Email must be a valid email address (username@domain)",
  confirmEmail: "Email addresses must match",
  password:
    "Password must be between 7 and 15 characters, and contain at least one number and special character",
  confirmPassword: "Passwords must match"
};