@using BTCPayServer.Abstractions
@using BTCPayServer.Controllers
@using BTCPayServer.Plugins.PointOfSale.Controllers
@using Microsoft.AspNetCore.Mvc
@using Microsoft.AspNetCore.Routing
@using Microsoft.Extensions.Localization
@inject LinkGenerator LinkGenerator
@inject IStringLocalizer StringLocalizer

@if (UserEmails?.Any() is true)
{
    <div @attributes="Attrs" class="@CssClass">
        <label for="SignedInUser" class="form-label">@StringLocalizer["Signed in user"]</label>
        <select id="SignedInUser" class="form-select" @onchange="@OnUserChanged">
            <option value="">@StringLocalizer["None, just open the URL"]</option>
            @foreach (var u in UserEmails)
            {
                <option value="@u.Key">@u.Value</option>
            }
        </select>
    </div>
}

<QrCode Data="@_qr" CanCopy="true" />

@code {
    [Parameter] public Dictionary<string, string> UserEmails { get; set; }
    [Parameter] public string BaseUrl { get; set; }
    [Parameter] public string AppId { get; set; }

    [Parameter(CaptureUnmatchedValues = true)]
    public Dictionary<string, object> Attrs { get; set; }

    private string CssClass => $"form-group {(Attrs?.ContainsKey("class") is true ? Attrs["class"] : "")}".Trim();

    string _qr = null;
    string _posUrlAbsolute = null;
    string _posPath = null;
    protected override void OnParametersSet()
    {
        _posPath = LinkGenerator.GetPathByAction(
            action: nameof(UIPointOfSaleController.ViewPointOfSale),
            controller: "UIPointOfSale",
            values: new { appId = AppId },
            pathBase: RequestBaseUrl.FromUrl(BaseUrl).PathBase);
        _posUrlAbsolute = LinkGenerator.GetUriByAction(
            action: nameof(UIPointOfSaleController.ViewPointOfSale),
            controller: "UIPointOfSale",
            values: new { appId = AppId },
            RequestBaseUrl.FromUrl(BaseUrl)
        );

        _qr = _posUrlAbsolute;
    }

    private void OnUserChanged(ChangeEventArgs e)
    {
        if (string.IsNullOrWhiteSpace(e.Value as string))
        {
            _qr = _posUrlAbsolute;
        }
        else
        {
            var loginUrl = LinkGenerator.GetUriByAction(
                action: nameof(UIAccountController.Login),
                controller: "UIAccount",
                values: new { returnUrl = _posPath, email = (string)e.Value },
                RequestBaseUrl.FromUrl(BaseUrl)
            );
            _qr = loginUrl;
        }
    }
}