@page "/phonevalidator"

@using System.Text.RegularExpressions


<EditForm Model="@phoneNumberModel" OnValidSubmit="HandleValidSubmit">
    <DataAnnotationsValidator />
    <ValidationSummary />

    <DxTextBox @bind-Text="phoneNumberModel.PhoneNumber" Placeholder="Enter phone number" />
    <DxButton Context="BtnContext" SubmitFormOnClick="true" RenderStyle=@ButtonRenderStyle.Primary>Validate</DxButton>
</EditForm>

<p>@result</p>

@if (validationResult.HasValue)
{
    <DxLabel CssClass="mt-3">
        @if (validationResult.Value)
        {
            <span class="text-success">The phone number is valid.</span>
        }
        else
        {
            <span class="text-danger">The phone number is invalid.</span>
        }
    </DxLabel>
}

@code {
    private PhoneNumberModel phoneNumberModel = new PhoneNumberModel();
    private bool? validationResult = null;
    private string result = "";
    private void HandleValidSubmit()
    {
        validationResult = IsValidInternationalPhoneNumber(phoneNumberModel.PhoneNumber);
        result = $"Validation result for {phoneNumberModel.PhoneNumber}: {validationResult}";
    }

    private bool IsValidInternationalPhoneNumber(string phoneNumber)
    {
        if (string.IsNullOrEmpty(phoneNumber))
        {
            return false;
        }

        // string pattern = @"\+(9[976]\d|8[987530]\d|6[987]\d|5[90]\d|42\d|3[875]\d|2[98654321]\d|9[8543210]|8[6421]|6[6543210]|5[87654321]|4[987654310]|3[9643210]|2[70]|7|1)\W*\d\W*\d\W*\d\W*\d\W*\d\W*\d\W*\d\W*\d\W*(\d{1,2})";
        string pattern = @"^\+(9[976]\d|8[987530]\d|6[987]\d|5[90]\d|42\d|3[875]\d|2[98654321]\d|9[8543210]|8[6421]|6[6543210]|5[87654321]|4[987654310]|3[9643210]|2[70]|7|1)\W*\d(\W*\d){1,14}$";
        Regex regex = new Regex(pattern);

        return regex.IsMatch(phoneNumber);
    }

    public class PhoneNumberModel
    {
        public string PhoneNumber { get; set; }
    }
}