@using Iceshrimp.Assets.PhosphorIcons
@using Iceshrimp.Frontend.Core.Services
@using Iceshrimp.Frontend.Localization
@using Iceshrimp.Shared.Schemas.Web
@using Microsoft.Extensions.Localization
@inject IStringLocalizer<Localization> Loc;
@inject ApiService                     Api;
<span class="follow-button">
    @switch (_buttonType)
        {
            case ButtonType.Follow:
                <button @onclick="Action" class="btn">
                    <span class="text">@Loc["Follow"]</span>
                    <Icon Name="Icons.Plus" class="icon"/>
                </button>
                break;
            case ButtonType.Unfollow:
                <button @onclick="Action" class="btn inverted">
                    <span class="text">@Loc["Unfollow"]</span>
                    <Icon Name="Icons.Minus" class="icon"/>
                </button>
                break;
            case ButtonType.FollowBack:
                <button @onclick="Action" class="btn">
                    <span class="text">@Loc["Follow back"]</span>
                    <Icon Name="Icons.Plus" class="icon"/>
                </button>
                break;
            case ButtonType.CancelRequest:
                <button @onclick="Action" class="btn inverted">
                    <span class="text">@Loc["Cancel request"]</span>
                    <Icon Name="Icons.X" class="icon"/>
                </button>
                break;
        }
</span>

@code {
    [Parameter] [EditorRequired] public required UserResponse        User        { get; set; }
    [Parameter] [EditorRequired] public required UserProfileResponse UserProfile { get; set; }
    private                                      ButtonType          _buttonType;

    protected override void OnInitialized()
    {
        ChooseButton();
    }

    private enum ButtonType
    {
        Follow,
        Unfollow,
        FollowBack,
        FollowLocked,
        CancelRequest
    }

    private void Action()
    {
        switch (_buttonType)
        {
            case ButtonType.Follow:
                Follow();
                break;
            case ButtonType.FollowBack:
                Follow();
                break;
            case ButtonType.Unfollow or ButtonType.CancelRequest:
                Unfollow();
                break;
        }
    }

    private async void Unfollow()
    {
        await Api.Users.UnfollowUser(User.Id);
        UserProfile.Relations -= (int)Relations.Following;
        ChooseButton();
        StateHasChanged();
    }

    private async void Follow()
    {
        await Api.Users.FollowUser(User.Id);
        UserProfile.Relations += (int)Relations.Requested;
        ChooseButton();
        StateHasChanged();
        UserProfile = await Api.Users.GetUserProfile(UserProfile.Id) ?? throw new Exception("How did it stop existing");
        ChooseButton();
        StateHasChanged();
    }

    private void ChooseButton()
    {
        if (UserProfile.Relations == Relations.None)
        {
            _buttonType = ButtonType.Follow;
        }

        if (UserProfile.Relations.HasFlag(Relations.FollowedBy))
        {
            _buttonType = ButtonType.FollowBack;
        }

        if (UserProfile.Relations.HasFlag(Relations.Following))
        {
            _buttonType = ButtonType.Unfollow;
        }

        if (UserProfile.Relations.HasFlag(Relations.Requested))
        {
            _buttonType = ButtonType.CancelRequest;
        }
    }
}