@page "/RoomStateViewer"
@using System.Net.Http.Headers
@using System.Text.Json
@using MatrixRoomUtils.Core
@inject ILocalStorageService LocalStorage
@inject NavigationManager NavigationManager
<h3>Room state viewer</h3>

<h5>Room list</h5>
<hr/>
@if (PolicyRoomList.Count == 0)
{
    <p>No policy rooms found.</p>
    <p>Loading progress: @checkedRoomCount/@totalRoomCount</p>
}
else
{
    @if (checkedRoomCount != totalRoomCount)
    {
        <p>Loading progress: @checkedRoomCount/@totalRoomCount</p>
    }
    foreach (var s in PolicyRoomList)
    {
        <a href="@(NavigationManager.Uri + "/" + s.RoomId.Replace('.', '~'))">@s.Name (@s.RoomId)</a>
        <br/>
    }
    <div style="margin-bottom: 4em;"></div>
}

<LogView></LogView>

@code {

    public List<PolicyRoomInfo> PolicyRoomList { get; set; } = new();

    private int checkedRoomCount { get; set; } = 0;
    private int totalRoomCount { get; set; } = 0;

    protected override async Task OnInitializedAsync()
    {
        if (!RuntimeCache.WasLoaded) await LocalStorageWrapper.LoadFromLocalStorage(LocalStorage);
        await base.OnInitializedAsync();
        if (RuntimeCache.CurrentHomeServer == null)
        {
            NavigationManager.NavigateTo("/Login");
            return;
        }
        await EnumeratePolicyRooms();
        Console.WriteLine("Policy list editor initialized!");
    }

    private async Task EnumeratePolicyRooms()
    {
        var rooms = (await RuntimeCache.CurrentHomeServer.GetJoinedRooms()).Select(x=>x.RoomId).ToList();

        totalRoomCount = rooms.Count;
        StateHasChanged();

        var semaphore = new SemaphoreSlim(128);
        var tasks = new List<Task<PolicyRoomInfo?>>();
        foreach (string room in rooms)
        {
            tasks.Add(GetPolicyRoomInfo(room, semaphore));
        }
        var results = await Task.WhenAll(tasks);
        PolicyRoomList.AddRange(results.Where(x => x != null).Select(x=>x.Value));
        
        StateHasChanged();
    }

    private async Task<PolicyRoomInfo?> GetPolicyRoomInfo(string room, SemaphoreSlim semaphore)
    {
        try
        {
            await semaphore.WaitAsync();
            return new PolicyRoomInfo()
            {
                RoomId = room,
                Name = await (await RuntimeCache.CurrentHomeServer.GetRoom(room)).GetNameAsync()
            };
        }
        finally
        {
            checkedRoomCount++;
            StateHasChanged();
            semaphore.Release();
        }
    }


    public struct PolicyRoomInfo
    {
        public string RoomId { get; set; }
        public string Name { get; set; }
    }
}