using System.Collections.Immutable;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp.Scripting;
using Microsoft.CodeAnalysis.Scripting;

namespace Cauldron.Core;

public class RoslynHost
{
	/// <summary>
	/// Run the provided C# script
	/// </summary>
	/// <param name="code">The script to run</param>
	/// <param name="imports">Namespace imports for the script</param>
	/// <param name="globals">Values that will be made available to the script</param>
	/// <param name="cancellationToken"></param>
	public static async Task RunScript(string code, string[] imports,
		RoslynHostGlobals globals, CancellationToken cancellationToken = default)
	{
		ScriptOptions options = ScriptOptions.Default
			.AddImports(imports);

		await CSharpScript.RunAsync(code, options, globals,
			cancellationToken: cancellationToken);
	}

	public static ImmutableArray<Diagnostic> BuildScript(string code, string[] imports,
		RoslynHostGlobals globals)
	{
		ScriptOptions options = ScriptOptions.Default
			.AddImports(imports);

		Script<object> script = CSharpScript.Create(code, options, globals.GetType());
		return script.GetCompilation().GetDiagnostics();
	}
}

public class RoslynHostGlobals
{
	public CauldronWriter Cauldron { get; set; }

	public RoslynHostGlobals(CauldronWriter writer)
	{
		this.Cauldron = writer;
	}
}