@page "/{room}"
@using Microsoft.AspNetCore.SignalR.Client
@using spanreed.Shared
@inject NavigationManager NavigationManager
@implements IDisposable
@inject HttpClient Http

<div class="form-group">
    <label>
        User:
        <input @bind="userInput" />
    </label>
</div>
<div class="form-group">
    <label>
        Message:
        <input @bind="messageInput" />
    </label>
</div>
<button @onclick="Send" disabled="@(!IsConnected)">Send</button>

<hr>

<ul id="messagesList">
    @foreach (var message in messages)
    {
        <li><MessageComponent author=@message.Author content=@message.Content timestamp=@message.Timestamp /></li>
    }
</ul>

@code {
    private HubConnection hubConnection;
    private List<ChatData> messages = new List<ChatData>();
    private string userInput;
    private string messageInput;
    [Parameter]
    public string room {get; set;}

    protected override async Task OnParametersSetAsync() {
        if (hubConnection != null) {
            try {
                await hubConnection.StopAsync(); 
            }
            finally {
                await hubConnection.DisposeAsync();
            }
        }

        messages.Clear();
        messageInput = "";

        hubConnection = new HubConnectionBuilder().WithUrl(NavigationManager.ToAbsoluteUri("/sendmessage")).Build();
        hubConnection.On<string, string, DateTime>("Received", (author, content, timestamp) => {
            messages.Add(new ChatData{Author = author, Content = content, Timestamp = timestamp});
            StateHasChanged();
        });
        var old_messages = await Http.GetFromJsonAsync<ChatData[]>($"Chat/{room}");

        if (old_messages != null) {
            foreach (var message in old_messages)
            {
                messages.Add(message);
            }
        }

        await hubConnection.StartAsync();

        await hubConnection.SendAsync("Connect", room);
    }

    Task Send() =>
        hubConnection.SendAsync("sendMessage", userInput, messageInput, room, DateTime.Now);

    public bool IsConnected =>
        hubConnection.State == HubConnectionState.Connected;

    public void Dispose() {
        _ = hubConnection.DisposeAsync();
    }
}