// This file is part of the AliceVision project.
// Copyright (c) 2021 AliceVision contributors.
// This Source Code Form is subject to the terms of the Mozilla Public License,
// v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at https://mozilla.org/MPL/2.0/.

#include <aliceVision/system/Logger.hpp>
#include <aliceVision/cmdline/cmdline.hpp>
#include <aliceVision/system/main.hpp>
#include <aliceVision/system/Timer.hpp>
#include <aliceVision/utils/filesIO.hpp>
#include <aliceVision/mesh/Texturing.hpp>
#include <aliceVision/mesh/Mesh.hpp>

#include <boost/program_options.hpp>

#include <filesystem>
#include <iostream>
#include <fstream>
#include <ostream>
#include <string>

// These constants define the current software version.
// They must be updated when the command line is changed.
#define ALICEVISION_SOFTWARE_VERSION_MAJOR 1
#define ALICEVISION_SOFTWARE_VERSION_MINOR 0

using namespace aliceVision;

namespace po = boost::program_options;
namespace fs = std::filesystem;

/**
 * @brief Convert Mesh
 */
int aliceVision_main(int argc, char** argv)
{
    // timer initialization

    system::Timer timer;

    // command-line parameters
    std::string inputMeshPath;
    std::string outputFilePath;

    // clang-format off
    po::options_description requiredParams("Required parameters");
    requiredParams.add_options()
        ("inputMesh", po::value<std::string>(&inputMeshPath)->default_value(inputMeshPath),
         "Mesh file path (*.obj, *.mesh, *.meshb, *.ply, *.off, *.stl).")
        ("output,o", po::value<std::string>(&outputFilePath)->default_value(outputFilePath),
         "Output file path for the new mesh file (*.obj, *.mesh, *.meshb, *.ply, *.off, *.stl).");
    // clang-format on

    CmdLine cmdline("The program allows to convert a mesh to another mesh format.\n"
                    "AliceVision convertMesh");
    cmdline.add(requiredParams);
    if (!cmdline.execute(argc, argv))
    {
        return EXIT_FAILURE;
    }

    // check first mesh file path
    if (!inputMeshPath.empty() && !utils::exists(inputMeshPath) && !fs::is_regular_file(inputMeshPath))
    {
        ALICEVISION_LOG_ERROR("The input mesh file doesn't exist");
        return EXIT_FAILURE;
    }

    // check output file path
    if (outputFilePath.empty())
    {
        ALICEVISION_LOG_ERROR("Invalid output");
        return EXIT_FAILURE;
    }

    // ensure output folder exists
    {
        const std::string outputFolderPart = fs::path(outputFilePath).parent_path().string();

        if (!outputFolderPart.empty() && !utils::exists(outputFolderPart))
        {
            if (!fs::create_directory(outputFolderPart))
            {
                ALICEVISION_LOG_ERROR("Cannot create output folder");
                return EXIT_FAILURE;
            }
        }
    }

    // load input mesh
    mesh::Texturing texturing;
    texturing.loadWithAtlas(inputMeshPath);
    mesh::Mesh* inputMesh = texturing.mesh;

    if (!inputMesh)
    {
        ALICEVISION_LOG_ERROR("Unable to read input mesh from the file: " << inputMeshPath);
        return EXIT_FAILURE;
    }

    if (inputMesh->pts.empty() || inputMesh->tris.empty())
    {
        ALICEVISION_LOG_ERROR("Error: empty mesh from the file " << inputMeshPath);
        ALICEVISION_LOG_ERROR("Input mesh: " << inputMesh->pts.size() << " vertices and " << inputMesh->tris.size() << " facets.");
        return EXIT_FAILURE;
    }

    // save output mesh
    ALICEVISION_LOG_INFO("Convert mesh.");
    inputMesh->save(outputFilePath);

    ALICEVISION_LOG_INFO("Task done in (s): " + std::to_string(timer.elapsed()));

    return EXIT_SUCCESS;
}
