// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

#nullable disable

using System.IO;
using Roslyn.Utilities;

namespace Microsoft.CodeAnalysis.Emit;

internal sealed class CompilationOutputFiles : CompilationOutputs
{
    internal static readonly CompilationOutputFiles None = new();

    public override string AssemblyDisplayPath => AssemblyFilePath;
    public override string PdbDisplayPath => PdbFilePath;

    public string PdbFilePath { get; }
    public string AssemblyFilePath { get; }

    public CompilationOutputFiles(string assemblyFilePath = null, string pdbFilePath = null)
    {
        if (assemblyFilePath != null)
        {
            CompilerPathUtilities.RequireAbsolutePath(assemblyFilePath, nameof(assemblyFilePath));
        }

        if (pdbFilePath != null)
        {
            CompilerPathUtilities.RequireAbsolutePath(pdbFilePath, nameof(pdbFilePath));
        }

        AssemblyFilePath = assemblyFilePath;
        PdbFilePath = pdbFilePath;
    }

    /// <summary>
    /// Opens an assembly file produced by the compiler (corresponds to OutputAssembly build task parameter).
    /// </summary>
    protected override Stream OpenAssemblyStream()
        => AssemblyFilePath != null ? FileUtilities.OpenRead(AssemblyFilePath) : null;

    /// <summary>
    /// Opens a PDB file produced by the compiler.
    /// Returns null if the compiler generated no PDB (the symbols might be embedded in the assembly).
    /// </summary>
    /// <remarks>
    /// The stream must be readable and seekable.
    /// </remarks>
    protected override Stream OpenPdbStream()
        => PdbFilePath != null ? FileUtilities.OpenRead(PdbFilePath) : null;
}