@using System.ComponentModel.DataAnnotations

@if (IsOpen)
{
    <div class="fixed inset-0 z-50 flex items-center justify-center"
         data-testid="@BaseTestId">

        <!-- Backdrop -->
        <div class="absolute inset-0 bg-black/70"
             data-testid="@($"{BaseTestId}-backdrop")"
             @onclick="Cancel">
        </div>

        <!-- Modal -->
        <div class="relative bg-zinc-900 border border-zinc-800 rounded w-full max-w-md p-4"
             data-testid="@($"{BaseTestId}-container")">

            <!-- Header -->
            <div class="flex justify-between items-center mb-3"
                 data-testid="@($"{BaseTestId}-header")">

                <div class="text-zinc-100 text-sm font-medium"
                     data-testid="@($"{BaseTestId}-title")">
                    @Title
                </div>

                <button class="text-zinc-400 hover:text-zinc-200"
                        data-testid="@($"{BaseTestId}-close")"
                        @onclick="Cancel">
                    ✕
                </button>
            </div>

            @if (!string.IsNullOrWhiteSpace(Description))
            {
                <div class="text-xs text-zinc-400 mb-4"
                     data-testid="@($"{BaseTestId}-description")">
                    @Description
                </div>
            }

            <!-- Form -->
            <EditForm Model="_model"
                      OnValidSubmit="HandleValidSubmit"
                      data-testid="@($"{BaseTestId}-form")">

                <DataAnnotationsValidator />

                @if (!string.IsNullOrEmpty(_error))
                {
                    <div class="text-xs text-red-400 mb-3"
                         data-testid="@($"{BaseTestId}-error")">
                        @_error
                    </div>
                }

                <div class="text-sm"
                     data-testid="@($"{BaseTestId}-field")">

                    <label class="block text-zinc-400 mb-1">
                        @Label
                    </label>

                    <InputText class="w-full bg-zinc-800 border border-zinc-700 rounded px-2 py-1 text-zinc-100"
                               data-testid="@($"{BaseTestId}-input")"
                               @bind-Value="_model.Value" />
                </div>

                <!-- Actions -->
                <div class="flex justify-end gap-2 mt-5"
                     data-testid="@($"{BaseTestId}-actions")">

                    <button type="button"
                            class="px-3 py-1 rounded border border-zinc-700 text-zinc-300 hover:bg-zinc-800"
                            data-testid="@($"{BaseTestId}-cancel")"
                            @onclick="Cancel">
                        Cancel
                    </button>

                    <button type="submit"
                            class="px-3 py-1 rounded bg-emerald-600 text-black hover:bg-emerald-500"
                            data-testid="@($"{BaseTestId}-submit")">
                        Accept
                    </button>
                </div>

            </EditForm>
        </div>
    </div>
}

@code {
    [Parameter] public bool IsOpen { get; set; }
    [Parameter] public EventCallback<bool> IsOpenChanged { get; set; }

    [Parameter] public string Title { get; set; } = "Add values";
    [Parameter] public string? Description { get; set; }
    [Parameter] public string Label { get; set; } = "Values";

    [Parameter] public string? Value { get; set; }

    [Parameter] public EventCallback<IReadOnlyList<string>> OnSubmit { get; set; }

    [Parameter] public string? TestIdPrefix { get; set; }

    private string BaseTestId =>
        string.IsNullOrWhiteSpace(TestIdPrefix)
            ? "comma-separated-string-modal"
            : $"{TestIdPrefix}-comma-separated-string-modal";

    private FormModel _model = new();
    private string? _error;

    protected override void OnParametersSet()
    {
        if (IsOpen)
        {
            _error = null;
            _model = new FormModel
            {
                Value = Value
            };
        }
    }

    private async Task HandleValidSubmit()
    {
        _error = null;

        try
        {
            var values = (_model.Value ?? string.Empty)
                .Split(',', StringSplitOptions.RemoveEmptyEntries)
                .Select(x => x.Trim())
                .Where(x => !string.IsNullOrWhiteSpace(x))
                .Distinct(StringComparer.OrdinalIgnoreCase)
                .ToList();

            if (!values.Any())
            {
                _error = "Please enter at least one value.";
                return;
            }

            await OnSubmit.InvokeAsync(values);
            await Close();
        }
        catch (Exception ex)
        {
            _error = ex.Message;
        }
    }

    private async Task Cancel()
    {
        await Close();
    }

    private async Task Close()
    {
        _model = new FormModel();
        _error = null;
        await IsOpenChanged.InvokeAsync(false);
    }

    private class FormModel
    {
        [Required]
        public string? Value { get; set; }
    }
}