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using System;
using System.Collections.Generic;
using System.Reflection;
using System.Reflection.Emit;
namespace StardewModdingAPI.Framework.Reflection
{
/// <summary>Generates proxy classes to access mod APIs through an arbitrary interface.</summary>
internal class InterfaceProxyFactory
{
/*********
** Fields
*********/
/// <summary>The CLR module in which to create proxy classes.</summary>
private readonly ModuleBuilder ModuleBuilder;
/// <summary>The generated proxy types.</summary>
private readonly IDictionary<string, InterfaceProxyBuilder> Builders = new Dictionary<string, InterfaceProxyBuilder>();
/*********
** Public methods
*********/
/// <summary>Construct an instance.</summary>
public InterfaceProxyFactory()
{
AssemblyBuilder assemblyBuilder = AssemblyBuilder.DefineDynamicAssembly(new AssemblyName($"StardewModdingAPI.Proxies, Version={this.GetType().Assembly.GetName().Version}, Culture=neutral"), AssemblyBuilderAccess.Run);
this.ModuleBuilder = assemblyBuilder.DefineDynamicModule("StardewModdingAPI.Proxies");
}
/// <summary>Create an API proxy.</summary>
/// <typeparam name="TInterface">The interface through which to access the API.</typeparam>
/// <param name="instance">The API instance to access.</param>
/// <param name="sourceModID">The unique ID of the mod consuming the API.</param>
/// <param name="targetModID">The unique ID of the mod providing the API.</param>
public TInterface CreateProxy<TInterface>(object instance, string sourceModID, string targetModID)
where TInterface : class
{
lock (this.Builders)
{
// validate
if (instance == null)
throw new InvalidOperationException("Can't proxy access to a null API.");
if (!typeof(TInterface).IsInterface)
throw new InvalidOperationException("The proxy type must be an interface, not a class.");
// get proxy type
Type targetType = instance.GetType();
string proxyTypeName = $"StardewModdingAPI.Proxies.From<{sourceModID}_{typeof(TInterface).FullName}>_To<{targetModID}_{targetType.FullName}>";
if (!this.Builders.TryGetValue(proxyTypeName, out InterfaceProxyBuilder builder))
{
builder = new InterfaceProxyBuilder(proxyTypeName, this.ModuleBuilder, typeof(TInterface), targetType);
this.Builders[proxyTypeName] = builder;
}
// create instance
return (TInterface)builder.CreateInstance(instance);
}
}
}
}
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