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#include "modinfowithconflictinfo.h"

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

using namespace MOBase;
using namespace MOShared;

ModInfoWithConflictInfo::ModInfoWithConflictInfo(DirectoryEntry** directoryStructure)
    : 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 */
    }
    }
    return result;
}

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

    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) {
            const std::vector<std::pair<int, std::wstring>>& alternatives = file->getAlternatives();
            if ((alternatives.size() == 0) || (alternatives.begin()->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()));
                    m_OverwrittenList.insert(altIndex);
                } else {
                    providesAnything = true;
                }

                // for all non-providing alternative origins
                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 (origin.getPriority() > altOrigin.getPriority()) {
                            m_OverwriteList.insert(altIndex);
                        } else {
                            m_OverwrittenList.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;
        }
    }
}

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;
}

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;
    }
}