text: // Copyright (c) 2022, ETH Zurich and UNC Chapel Hill.
  // All rights reserved.
  //
  // Redistribution and use in source and binary forms, with or without
  // modification, are permitted provided that the following conditions are met:
  //
  //     * Redistributions of source code must retain the above copyright
  //       notice, this list of conditions and the following disclaimer.
  //
  //     * Redistributions in binary form must reproduce the above copyright
  //       notice, this list of conditions and the following disclaimer in the
  //       documentation and/or other materials provided with the distribution.
  //
  //     * Neither the name of ETH Zurich and UNC Chapel Hill nor the names of
  //       its contributors may be used to endorse or promote products derived
  //       from this software without specific prior written permission.
  //
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  // ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
  // LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  // CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  // SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  // INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  // CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  // ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  // POSSIBILITY OF SUCH DAMAGE.
  //
  // Author: Johannes L. Schoenberger (jsch-at-demuc-dot-de)
  
  #include "base/reconstruction_manager.h"
  
  #include "util/misc.h"
  #include "util/option_manager.h"
  
  namespace colmap {
  
  ReconstructionManager::ReconstructionManager() {}
  
  ReconstructionManager::ReconstructionManager(ReconstructionManager&& other)
      : ReconstructionManager() {
    reconstructions_ = std::move(other.reconstructions_);
  }
  
  ReconstructionManager& ReconstructionManager::operator=(
      ReconstructionManager&& other) {
    if (this != &other) {
      reconstructions_ = std::move(other.reconstructions_);
    }
    return *this;
  }
  
  size_t ReconstructionManager::Size() const { return reconstructions_.size(); }
  
  const Reconstruction& ReconstructionManager::Get(const size_t idx) const {
    return *reconstructions_.at(idx);
  }
  
  Reconstruction& ReconstructionManager::Get(const size_t idx) {
    return *reconstructions_.at(idx);
  }
  
  size_t ReconstructionManager::Add() {
    const size_t idx = Size();
    reconstructions_.emplace_back(new Reconstruction());
    return idx;
  }
  
  void ReconstructionManager::Delete(const size_t idx) {
    CHECK_LT(idx, reconstructions_.size());
    reconstructions_.erase(reconstructions_.begin() + idx);
  }
  
  void ReconstructionManager::Clear() { reconstructions_.clear(); }
  
  size_t ReconstructionManager::Read(const std::string& path) {
    const size_t idx = Add();
    reconstructions_[idx]->Read(path);
    return idx;
  }
  
  void ReconstructionManager::Write(const std::string& path,
                                    const OptionManager* options) const {
    std::vector<std::pair<size_t, size_t>> recon_sizes(reconstructions_.size());
    for (size_t i = 0; i < reconstructions_.size(); ++i) {
      recon_sizes[i] = std::make_pair(i, reconstructions_[i]->NumPoints3D());
    }
    std::sort(recon_sizes.begin(), recon_sizes.end(),
              [](const std::pair<size_t, size_t>& first,
                 const std::pair<size_t, size_t>& second) {
                return first.second > second.second;
              });
  
    for (size_t i = 0; i < reconstructions_.size(); ++i) {
      const std::string reconstruction_path = JoinPaths(path, std::to_string(i));
      CreateDirIfNotExists(reconstruction_path);
      reconstructions_[recon_sizes[i].first]->Write(reconstruction_path);
      if (options != nullptr) {
        options->Write(JoinPaths(reconstruction_path, "project.ini"));
      }
    }
  }
  
  }  // namespace colmap
  