@using System.IO
@using Azure.Core
@using Microsoft.Graph
@inject TeamsFx teamsfx
@inject TeamsUserCredential teamsUserCredential

<div>
    <h2>Get the user's profile</h2>
    @if (NeedConsent)
    {
        <p>Click below to authorize this app to read your profile photo using Microsoft Graph.</p>
        <FluentButton Appearance="Appearance.Accent" Disabled="@IsLoading" @onclick="ConsentAndShow">Authorize</FluentButton>
    }
    else if (!string.IsNullOrEmpty(@ErrorMessage))
    {
        <div class="error">@ErrorMessage</div>
    }
    else if (Profile != null)
    {
        <div>Hello @Profile.DisplayName</div>
    }
</div>

@code {
    [Parameter]
    public string ErrorMessage { get; set; }

    public bool IsLoading { get; set; }
    public bool NeedConsent { get; set; }
    public User Profile { get; set; }

    private readonly string _scope = "User.Read";

    protected override async Task OnInitializedAsync()
    {
        IsLoading = true;
        if (await HasPermission(_scope))
        {
            await ShowProfile();
        }
    }

    private async Task ShowProfile()
    {
        IsLoading = true;
        var graph = GetGraphServiceClient();

        Profile = await graph.Me.Request().GetAsync();

        IsLoading = false;
        ErrorMessage = string.Empty;
    }

    private async Task ConsentAndShow()
    {
        try
        {
            await teamsUserCredential.LoginAsync(_scope);
            NeedConsent = false;
            await ShowProfile();
        }
        catch (ExceptionWithCode e)
        {
            ErrorMessage = e.Message;
        }
    }

    private async Task<bool> HasPermission(string scope)
    {
        IsLoading = true;
        try
        {
            await teamsUserCredential.GetTokenAsync(new TokenRequestContext(new string[] { _scope }), new System.Threading.CancellationToken());
            return true;
        }
        catch (ExceptionWithCode e)
        {
            if (e.Code == ExceptionCode.UiRequiredError)
            {
                NeedConsent = true;
            }
            else
            {
                ErrorMessage = e.Message;
            }

        }
        IsLoading = false;
        return false;
    }
    
    private GraphServiceClient GetGraphServiceClient()
    {
        var client = new GraphServiceClient(teamsUserCredential, new string[] { _scope });
        return client;
    }
}