// -------------------------------------------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License (MIT). See LICENSE in the repo root for license information.
// -------------------------------------------------------------------------------------------------

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.Formatting;
using static Microsoft.CodeAnalysis.CSharp.SyntaxFactory;

namespace Microsoft.Health.Extensions.BuildTimeCodeGenerator;

internal class Program
{
    public static void Main(string generatorName, FileInfo outputFile, string @namespace, string[] args = null)
    {
        string className = Path.GetFileName(outputFile.Name).Split('.')[0];

        Type codeGeneratorType = Assembly.GetExecutingAssembly().GetTypes().SingleOrDefault(t => t.Name == generatorName) ?? throw new ArgumentException($"Generator '{generatorName} not found");
        var generator = (ICodeGenerator)Activator.CreateInstance(codeGeneratorType, new object[] { args });

        (MemberDeclarationSyntax[] declarations, UsingDirectiveSyntax[] usingDirectives) = generator.Generate(className);

        NamespaceDeclarationSyntax namespaceDeclaration =
            NamespaceDeclaration(IdentifierName(@namespace))
                .AddUsings(usingDirectives)
                .AddMembers(declarations)
                .WithLeadingTrivia(
                    Comment(@"//------------------------------------------------------------------------------
// <auto-generated>
//     This code was generated by a tool.
//
//     Changes to this file may cause incorrect behavior and will be lost if
//     the code is regenerated.
// </auto-generated>
//------------------------------------------------------------------------------
"));

        // This formats in a somewhat nicer way than NormalizeWhitespace()
        using var workspace = new AdhocWorkspace();
        var formattedSyntax = Formatter.Format(namespaceDeclaration, workspace);

        File.WriteAllText(outputFile.FullName, formattedSyntax.SyntaxTree.ToString());
    }
}