using System.Runtime.Loader;
using AcDream.Plugin.Abstractions;
using AcDream.Plugin.Abstractions.Rendering;

namespace AcDream.Core.Plugins;

/// <summary>
/// Outcome of a plugin load attempt.
/// <para>On success, at least one of <see cref="Plugin"/> or
/// <see cref="RenderPackPlugin"/> is instantiated, <see cref="LoadContext"/>
/// owns the assembly, and <see cref="Error"/> is null.</para>
/// <para>On failure, <see cref="Error"/> describes what went wrong. A partial
/// entry-point instances and/or <see cref="LoadContext"/> may still be present;
/// the caller owns their cleanup. The loader never requests collectible unload
/// itself because the session must first roll back host registrations.</para>
/// </summary>
public sealed record LoadedPlugin(
    PluginManifest Manifest,
    IAcDreamPlugin? Plugin,
    AssemblyLoadContext? LoadContext,
    Exception? Error,
    IRenderPackPlugin? RenderPackPlugin = null)
{
    public bool Success =>
        (Plugin is not null || RenderPackPlugin is not null)
        && LoadContext is not null
        && Error is null;
}