// Copyright (c) Microsoft Corporation. 
// Licensed under the MIT license. 

using System;
using System.IO;
using System.Threading.Tasks;

public class Program
{
    static void RunOpacityCasting(Simplygon.ISimplygon sg)
    {
        using (Simplygon.spSceneImporter sgSceneImporter = sg.CreateSceneImporter())
        {
            sgSceneImporter.SetImportFilePath( "../Assets/Console/Console.obj" );
            if(!sgSceneImporter.RunImport())
                throw new System.Exception("Failed to load Console/Console.obj.");
            Simplygon.spScene sgScene = sgSceneImporter.GetScene();

            // Create the remeshing processor. 
            using (Simplygon.spRemeshingProcessor sgRemeshingProcessor = sg.CreateRemeshingProcessor())
            {
                sgRemeshingProcessor.SetScene( sgScene );

                using (Simplygon.spRemeshingSettings sgRemeshingSettings = sgRemeshingProcessor.GetRemeshingSettings())
                using (Simplygon.spMappingImageSettings sgMappingImageSettings = sgRemeshingProcessor.GetMappingImageSettings())
                {
                    // Set on-screen size target for remeshing. 
                    sgRemeshingSettings.SetOnScreenSize( 300 );

                    // Generates a mapping image which is used after the remeshing to cast new materials to the new 
                    // remeshed object. 
                    sgMappingImageSettings.SetGenerateMappingImage( true );
                    sgMappingImageSettings.SetApplyNewMaterialIds( true );
                    sgMappingImageSettings.SetGenerateTangents( true );
                    sgMappingImageSettings.SetUseFullRetexturing( true );

                    using (Simplygon.spMappingImageOutputMaterialSettings sgOutputMaterialSettings = sgMappingImageSettings.GetOutputMaterialSettings(0))
                    {
                        // Setting the size of the output material for the mapping image. This will be the output size of the 
                        // textures when we do material casting in a later stage. 
                        sgOutputMaterialSettings.SetTextureWidth( 2048 );
                        sgOutputMaterialSettings.SetTextureHeight( 2048 );

                    }
                }
                // Start the remeshing process. 
                sgRemeshingProcessor.RunProcessing();

                // Setup and run the layered diffuse material casting using the selected opacity channel. 
                string diffuseTextureFilePath;
                using (Simplygon.spColorCaster sgDiffuseCaster = sg.CreateColorCaster())
                {
                    sgDiffuseCaster.SetMappingImage( sgRemeshingProcessor.GetMappingImage() );
                    sgDiffuseCaster.SetSourceMaterials( sgScene.GetMaterialTable() );
                    sgDiffuseCaster.SetSourceTextures( sgScene.GetTextureTable() );
                    sgDiffuseCaster.SetOutputFilePath( "DiffuseTexture" );

                    using (Simplygon.spColorCasterSettings sgDiffuseCasterSettings = sgDiffuseCaster.GetColorCasterSettings())
                    {
                        sgDiffuseCasterSettings.SetMaterialChannel( "Diffuse" );
                        sgDiffuseCasterSettings.SetOpacityChannel( "Opacity" );
                        sgDiffuseCasterSettings.SetOutputImageFileFormat( Simplygon.EImageOutputFormat.PNG );
                    }

                    sgDiffuseCaster.RunProcessing();
                    diffuseTextureFilePath = sgDiffuseCaster.GetOutputFilePath();
                }

                // Update scene with new casted textures. 
                using (Simplygon.spMaterialTable sgMaterialTable = sg.CreateMaterialTable())
                using (Simplygon.spTextureTable sgTextureTable = sg.CreateTextureTable())
                using (Simplygon.spMaterial sgMaterial = sg.CreateMaterial())
                {
                    using(Simplygon.spTexture sgDiffuseTexture = sg.CreateTexture())
                    {
                        sgDiffuseTexture.SetName( "Diffuse" );
                        sgDiffuseTexture.SetFilePath( diffuseTextureFilePath );
                        sgTextureTable.AddTexture( sgDiffuseTexture );
                    }

                    using(Simplygon.spShadingTextureNode sgDiffuseTextureShadingNode = sg.CreateShadingTextureNode())
                    {
                        sgDiffuseTextureShadingNode.SetTexCoordLevel( 0 );
                        sgDiffuseTextureShadingNode.SetTextureName( "Diffuse" );

                        sgMaterial.AddMaterialChannel( "Diffuse" );
                        sgMaterial.SetShadingNetwork( "Diffuse", sgDiffuseTextureShadingNode );
                    }

                    sgMaterialTable.AddMaterial( sgMaterial );

                    sgScene.GetTextureTable().Clear();
                    sgScene.GetMaterialTable().Clear();
                    sgScene.GetTextureTable().Copy(sgTextureTable);
                    sgScene.GetMaterialTable().Copy(sgMaterialTable);
                }

            }
            using (Simplygon.spSceneExporter sgSceneExporter = sg.CreateSceneExporter())
            {
                sgSceneExporter.SetScene(sgScene);
                sgSceneExporter.SetExportFilePath( "Output.fbx" );
                if(!sgSceneExporter.RunExport())
                    throw new System.Exception("Failed to save Output.fbx.");

            }
        }
    }
    static void Main(string[] args)
    {
        using (var sg = Simplygon.Loader.InitSimplygon(out var errorCode, out var errorMessage))
        {
            if (errorCode != Simplygon.EErrorCodes.NoError)
                return;
            RunOpacityCasting(sg);
        }
    }
}