// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using Microsoft.AspNetCore.Components.Web.Infrastructure;
 
namespace Microsoft.AspNetCore.Components.Server.Circuits;
 
internal sealed class CircuitJSComponentInterop : JSComponentInterop
{
    private readonly CircuitOptions _circuitOptions;
    private int _jsRootComponentCount;
 
    internal CircuitJSComponentInterop(CircuitOptions circuitOptions)
        : base(circuitOptions.RootComponents.JSComponents)
    {
        _circuitOptions = circuitOptions;
    }
 
    protected override int AddRootComponent(string identifier, string domElementSelector)
    {
        if (_jsRootComponentCount >= _circuitOptions.RootComponents.MaxJSRootComponents)
        {
            throw new InvalidOperationException($"Cannot add further JS root components because the configured limit of {_circuitOptions.RootComponents.MaxJSRootComponents} has been reached.");
        }
 
        var id = base.AddRootComponent(identifier, domElementSelector);
        _jsRootComponentCount++;
        return id;
    }
 
    protected override void RemoveRootComponent(int componentId)
    {
        base.RemoveRootComponent(componentId);
 
        // It didn't throw, so the root component did exist before and was actually removed
        _jsRootComponentCount--;
    }
}