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#include "modinfowithconflictinfo.h"

#include "directoryentry.h"
#include "utility.h"

using namespace MOBase;
using namespace MOShared;

ModInfoWithConflictInfo::ModInfoWithConflictInfo(PluginContainer *pluginContainer, DirectoryEntry **directoryStructure)
  : ModInfo(pluginContainer), m_DirectoryStructure(directoryStructure) {}

void ModInfoWithConflictInfo::clearCaches()
{
  m_LastConflictCheck = QTime();
}

std::vector<ModInfo::EFlag> ModInfoWithConflictInfo::getFlags() const
{
  std::vector<ModInfo::EFlag> result;
  switch (isConflicted()) {
    case CONFLICT_MIXED: {
      result.push_back(ModInfo::FLAG_CONFLICT_MIXED);
    } break;
    case CONFLICT_OVERWRITE: {
      result.push_back(ModInfo::FLAG_CONFLICT_OVERWRITE);
    } break;
    case CONFLICT_OVERWRITTEN: {
      result.push_back(ModInfo::FLAG_CONFLICT_OVERWRITTEN);
    } break;
    case CONFLICT_REDUNDANT: {
      result.push_back(ModInfo::FLAG_CONFLICT_REDUNDANT);
    } break;
    default: { /* NOP */ }
  }
  switch (isArchiveConflicted()) {
      case CONFLICT_MIXED: {
          result.push_back(ModInfo::FLAG_ARCHIVE_CONFLICT_MIXED);
      } break;
      case CONFLICT_OVERWRITE: {
          result.push_back(ModInfo::FLAG_ARCHIVE_CONFLICT_OVERWRITE);
      } break;
      case CONFLICT_OVERWRITTEN: {
          result.push_back(ModInfo::FLAG_ARCHIVE_CONFLICT_OVERWRITTEN);
      } break;
      default: { /* NOP */ }
  }
  return result;
}


void ModInfoWithConflictInfo::doConflictCheck() const
{
  m_OverwriteList.clear();
  m_OverwrittenList.clear();
  m_ArchiveOverwriteList.clear();
  m_ArchiveOverwrittenList.clear();

  bool providesAnything = false;

  int dataID = 0;
  if ((*m_DirectoryStructure)->originExists(L"data")) {
    dataID = (*m_DirectoryStructure)->getOriginByName(L"data").getID();
  }

  std::wstring name = ToWString(this->name());

  m_CurrentConflictState = CONFLICT_NONE;
  m_ArchiveConflictState = CONFLICT_NONE;

  if ((*m_DirectoryStructure)->originExists(name)) {
    FilesOrigin &origin = (*m_DirectoryStructure)->getOriginByName(name);
    std::vector<FileEntry::Ptr> files = origin.getFiles();
    // for all files in this origin
    for (FileEntry::Ptr file : files) {
      auto alternatives = file->getAlternatives();
      if ((alternatives.size() == 0) || (alternatives.back().first == dataID)) {
        // no alternatives -> no conflict
        providesAnything = true;
      } else {
        if (file->getOrigin() != origin.getID()) {
          FilesOrigin &altOrigin = (*m_DirectoryStructure)->getOriginByID(file->getOrigin());
          unsigned int altIndex = ModInfo::getIndex(ToQString(altOrigin.getName()));
          if (file->getArchive().first.size() == 0)
              m_OverwrittenList.insert(altIndex);
          else
              m_ArchiveOverwrittenList.insert(altIndex);
        } else {
          providesAnything = true;
        }

        // for all non-providing alternative origins
        bool found = file->getOrigin() == origin.getID();
        std::pair<std::wstring, int> archiveData;
        if (found)
          archiveData = file->getArchive();
        else {
          for (auto alts : alternatives) {
            if (alts.first == origin.getID()) {
              archiveData = alts.second;
              break;
            }
          }
        }
        for (auto altInfo : alternatives) {
          if ((altInfo.first != dataID) && (altInfo.first != origin.getID())) {
            FilesOrigin &altOrigin = (*m_DirectoryStructure)->getOriginByID(altInfo.first);
            unsigned int altIndex = ModInfo::getIndex(ToQString(altOrigin.getName()));
            if (altInfo.second.first.size() == 0) {
              if (archiveData.first.size() == 0) {
                if (origin.getPriority() > altOrigin.getPriority()) {
                  m_OverwriteList.insert(altIndex);
                } else {
                  m_OverwrittenList.insert(altIndex);
                }
              } else {
                m_ArchiveOverwrittenList.insert(altIndex);
              }
            } else {
              if (archiveData.first.size() == 0) {
                m_ArchiveOverwrittenList.insert(altIndex);
              } else {
                if (archiveData.second > altInfo.second.second) {
                  m_ArchiveOverwriteList.insert(altIndex);
                } else if (archiveData.second < altInfo.second.second) {
                  m_ArchiveOverwrittenList.insert(altIndex);
                }
              }
            }
          }
        }
      }
    }
    m_LastConflictCheck = QTime::currentTime();

    if (files.size() != 0) {
      if (!providesAnything)
        m_CurrentConflictState = CONFLICT_REDUNDANT;
      else if (!m_OverwriteList.empty() && !m_OverwrittenList.empty())
        m_CurrentConflictState = CONFLICT_MIXED;
      else if (!m_OverwriteList.empty())
        m_CurrentConflictState = CONFLICT_OVERWRITE;
      else if (!m_OverwrittenList.empty())
        m_CurrentConflictState = CONFLICT_OVERWRITTEN;
    }

    if (!m_ArchiveOverwriteList.empty() && !m_ArchiveOverwrittenList.empty())
        m_ArchiveConflictState = CONFLICT_MIXED;
    else if (!m_ArchiveOverwriteList.empty())
        m_ArchiveConflictState = CONFLICT_OVERWRITE;
    else if (!m_ArchiveOverwrittenList.empty())
        m_ArchiveConflictState = CONFLICT_OVERWRITTEN;
  }
}

ModInfoWithConflictInfo::EConflictType ModInfoWithConflictInfo::isConflicted() const
{
  // this is costy so cache the result
  QTime now = QTime::currentTime();
  if (m_LastConflictCheck.isNull() || (m_LastConflictCheck.secsTo(now) > 10)) {
    doConflictCheck();
  }

  return m_CurrentConflictState;
}

ModInfoWithConflictInfo::EConflictType ModInfoWithConflictInfo::isArchiveConflicted() const
{
    QTime now = QTime::currentTime();
    if (m_LastConflictCheck.isNull() || (m_LastConflictCheck.secsTo(now) > 10)) {
        doConflictCheck();
    }

    return m_ArchiveConflictState;
}


bool ModInfoWithConflictInfo::isRedundant() const
{
  std::wstring name = ToWString(this->name());
  if ((*m_DirectoryStructure)->originExists(name)) {
    FilesOrigin &origin = (*m_DirectoryStructure)->getOriginByName(name);
    std::vector<FileEntry::Ptr> files = origin.getFiles();
    bool ignore = false;
    for (auto iter = files.begin(); iter != files.end(); ++iter) {
      if ((*iter)->getOrigin(ignore) == origin.getID()) {
        return false;
      }
    }
    return true;
  } else {
    return false;
  }
}