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  • // SPDX-FileCopyrightText: Nheko Contributors
    //
    // SPDX-License-Identifier: GPL-3.0-or-later
    
    #include "GridImagePackModel.h"
    
    
    #include <QCoreApplication>
    
    #include <QTextBoundaryFinder>
    
    
    #include <algorithm>
    
    
    #include "Cache_p.h"
    
    #include "emoji/Provider.h"
    
    QString
    emoji::categoryToName(emoji::Emoji::Category cat)
    
    {
        switch (cat) {
        case emoji::Emoji::Category::People:
            return QCoreApplication::translate("emoji-catagory", "People");
        case emoji::Emoji::Category::Nature:
            return QCoreApplication::translate("emoji-catagory", "Nature");
        case emoji::Emoji::Category::Food:
            return QCoreApplication::translate("emoji-catagory", "Food");
        case emoji::Emoji::Category::Activity:
            return QCoreApplication::translate("emoji-catagory", "Activity");
        case emoji::Emoji::Category::Travel:
            return QCoreApplication::translate("emoji-catagory", "Travel");
        case emoji::Emoji::Category::Objects:
            return QCoreApplication::translate("emoji-catagory", "Objects");
        case emoji::Emoji::Category::Symbols:
            return QCoreApplication::translate("emoji-catagory", "Symbols");
        case emoji::Emoji::Category::Flags:
            return QCoreApplication::translate("emoji-catagory", "Flags");
        default:
            return "";
        }
    }
    
    static QString
    categoryToIcon(emoji::Emoji::Category cat)
    {
        switch (cat) {
        case emoji::Emoji::Category::People:
            return QStringLiteral(":/icons/icons/emoji-categories/people.svg");
        case emoji::Emoji::Category::Nature:
            return QStringLiteral(":/icons/icons/emoji-categories/nature.svg");
        case emoji::Emoji::Category::Food:
            return QStringLiteral(":/icons/icons/emoji-categories/foods.svg");
        case emoji::Emoji::Category::Activity:
            return QStringLiteral(":/icons/icons/emoji-categories/activity.svg");
        case emoji::Emoji::Category::Travel:
            return QStringLiteral(":/icons/icons/emoji-categories/travel.svg");
        case emoji::Emoji::Category::Objects:
            return QStringLiteral(":/icons/icons/emoji-categories/objects.svg");
        case emoji::Emoji::Category::Symbols:
            return QStringLiteral(":/icons/icons/emoji-categories/symbols.svg");
        case emoji::Emoji::Category::Flags:
            return QStringLiteral(":/icons/icons/emoji-categories/flags.svg");
        default:
            return "";
        }
    }
    
    
    GridImagePackModel::GridImagePackModel(const std::string &roomId, bool stickers, QObject *parent)
      : QAbstractListModel(parent)
      , room_id(roomId)
    
      , columns(stickers ? 3 : 7)
    
        if (!stickers) {
            for (const auto &category : {
                   emoji::Emoji::Category::People,
                   emoji::Emoji::Category::Nature,
                   emoji::Emoji::Category::Food,
                   emoji::Emoji::Category::Activity,
                   emoji::Emoji::Category::Travel,
                   emoji::Emoji::Category::Objects,
                   emoji::Emoji::Category::Symbols,
                   emoji::Emoji::Category::Flags,
                 }) {
                PackDesc newPack{};
                newPack.packname   = categoryToName(category);
                newPack.packavatar = categoryToIcon(category);
    
                auto emojisInCategory = std::ranges::equal_range(
                  emoji::Provider::emoji, category, {}, &emoji::Emoji::category);
                newPack.emojis.reserve(emojisInCategory.size());
    
                for (const auto &e : emojisInCategory) {
                    newPack.emojis.push_back(TextEmoji{.unicode     = e.unicode(),
                                                       .unicodeName = e.unicodeName(),
                                                       .shortcode   = e.shortName()});
                }
    
                size_t packRowCount =
                  (newPack.emojis.size() / columns) + (newPack.emojis.size() % columns ? 1 : 0);
                newPack.firstRow = rowToPack.size();
                for (size_t i = 0; i < packRowCount; i++)
                    rowToPack.push_back(packs.size());
                packs.push_back(std::move(newPack));
            }
        }
    
    
        auto originalPacks = cache::client()->getImagePacks(room_id, stickers);
    
        for (auto &pack : originalPacks) {
            PackDesc newPack{};
            newPack.packname =
              pack.pack.pack ? QString::fromStdString(pack.pack.pack->display_name) : QString();
    
            newPack.packavatar =
              pack.pack.pack ? QString::fromStdString(pack.pack.pack->avatar_url) : QString();
    
            newPack.room_id   = pack.source_room;
            newPack.state_key = pack.state_key;
    
            newPack.images.resize(pack.pack.images.size());
            std::ranges::transform(std::move(pack.pack.images), newPack.images.begin(), [](auto &&img) {
                return std::pair(std::move(img.second), QString::fromStdString(img.first));
            });
    
            size_t packRowCount =
              (newPack.images.size() / columns) + (newPack.images.size() % columns ? 1 : 0);
            newPack.firstRow = rowToPack.size();
            for (size_t i = 0; i < packRowCount; i++)
                rowToPack.push_back(packs.size());
            packs.push_back(std::move(newPack));
        }
    
    
        // prepare search index
    
        auto insertParts = [this](const QString &str, std::pair<std::uint32_t, std::uint32_t> id) {
            QTextBoundaryFinder finder(QTextBoundaryFinder::BoundaryType::Word, str);
            finder.toStart();
            do {
                auto start = finder.position();
                finder.toNextBoundary();
                auto end = finder.position();
    
    
                auto ref = QStringView(str).mid(start, end - start).trimmed();
    
                if (!ref.isEmpty())
                    trie_.insert<ElementRank::second>(ref.toUcs4(), id);
            } while (finder.position() < str.size());
        };
    
        std::uint32_t packIndex = 0;
        for (const auto &pack : packs) {
    
            std::uint32_t emojiIndex = 0;
            for (const auto &emoji : pack.emojis) {
                std::pair<std::uint32_t, std::uint32_t> key{packIndex, emojiIndex};
    
                QString string1 = emoji.shortcode.toCaseFolded();
                QString string2 = emoji.unicodeName.toCaseFolded();
    
                if (!string1.isEmpty()) {
                    trie_.insert<ElementRank::first>(string1.toUcs4(), key);
                    insertParts(string1, key);
                }
                if (!string2.isEmpty()) {
                    trie_.insert<ElementRank::first>(string2.toUcs4(), key);
                    insertParts(string2, key);
                }
    
                emojiIndex++;
            }
    
    
            std::uint32_t imgIndex = 0;
            for (const auto &img : pack.images) {
                std::pair<std::uint32_t, std::uint32_t> key{packIndex, imgIndex};
    
                QString string1 = img.second.toCaseFolded();
                QString string2 = QString::fromStdString(img.first.body).toCaseFolded();
    
                if (!string1.isEmpty()) {
                    trie_.insert<ElementRank::first>(string1.toUcs4(), key);
                    insertParts(string1, key);
                }
                if (!string2.isEmpty()) {
                    trie_.insert<ElementRank::first>(string2.toUcs4(), key);
                    insertParts(string2, key);
                }
    
                imgIndex++;
            }
            packIndex++;
        }
    
    }
    
    int
    GridImagePackModel::rowCount(const QModelIndex &) const
    {
    
        return static_cast<int>(searchString_.isEmpty() ? rowToPack.size()
                                                        : rowToFirstRowEntryFromSearch.size());
    
    }
    
    QHash<int, QByteArray>
    GridImagePackModel::roleNames() const
    {
        return {
          {Roles::PackName, "packname"},
          {Roles::Row, "row"},
        };
    }
    
    QVariant
    GridImagePackModel::data(const QModelIndex &index, int role) const
    {
        if (index.row() < rowCount() && index.row() >= 0) {
    
            if (searchString_.isEmpty()) {
                const auto &pack = packs[rowToPack[index.row()]];
                switch (role) {
                case Roles::PackName:
    
                    return nameFromPack(pack);
    
                case Roles::Row: {
                    std::size_t offset = static_cast<std::size_t>(index.row()) - pack.firstRow;
    
                    if (pack.emojis.empty()) {
                        QList<StickerImage> imgs;
                        auto endOffset = std::min((offset + 1) * columns, pack.images.size());
                        for (std::size_t img = offset * columns; img < endOffset; img++) {
                            const auto &data = pack.images.at(img);
    
                            // See
                            // https://developercommunity.visualstudio.com/t/Internal-compile-error-while-compiling-c/1227337
                            imgs.push_back({/*.url        =*/QString::fromStdString(data.first.url),
                                            /*.shortcode  =*/data.second,
                                            /*.body       =*/QString::fromStdString(data.first.body),
                                            /*.descriptor_=*/
                                            std::vector{
    
                                              pack.room_id,
                                              pack.state_key,
                                              data.second.toStdString(),
                                            }});
                        }
                        return QVariant::fromValue(imgs);
                    } else {
                        auto endOffset = std::min((offset + 1) * columns, pack.emojis.size());
                        QList<TextEmoji> imgs(pack.emojis.begin() + offset * columns,
                                              pack.emojis.begin() + endOffset);
    
                        return QVariant::fromValue(imgs);
    
                    }
                }
                default:
                    return {};
                }
            } else {
                if (static_cast<size_t>(index.row()) >= rowToFirstRowEntryFromSearch.size())
                    return {};
    
                const auto firstIndex = rowToFirstRowEntryFromSearch[index.row()];
                const auto firstEntry = currentSearchResult[firstIndex];
                const auto &pack      = packs[firstEntry.first];
    
                switch (role) {
                case Roles::PackName:
    
                    return nameFromPack(pack);
    
                case Roles::Row: {
    
                    if (pack.emojis.empty()) {
                        QList<StickerImage> imgs;
                        for (auto img = firstIndex;
                             imgs.size() < columns && img < currentSearchResult.size() &&
                             currentSearchResult[img].first == firstEntry.first;
                             img++) {
                            const auto &data = pack.images.at(currentSearchResult[img].second);
    
                            // See
                            // https://developercommunity.visualstudio.com/t/Internal-compile-error-while-compiling-c/1227337
                            imgs.push_back({/*.url         = */ QString::fromStdString(data.first.url),
                                            /*.shortcode   = */ data.second,
                                            /*.body        = */ QString::fromStdString(data.first.body),
                                            /*.descriptor_ = */
                                            std::vector{
    
                                              pack.room_id,
                                              pack.state_key,
                                              data.second.toStdString(),
                                            }});
                        }
                        return QVariant::fromValue(imgs);
                    } else {
                        QList<TextEmoji> emojis;
                        for (auto emoji = firstIndex;
                             emojis.size() < columns && emoji < currentSearchResult.size() &&
                             currentSearchResult[emoji].first == firstEntry.first;
                             emoji++) {
                            emojis.push_back(pack.emojis.at(currentSearchResult[emoji].second));
                        }
                        return QVariant::fromValue(emojis);
    
    QString
    GridImagePackModel::nameFromPack(const PackDesc &pack) const
    {
        if (!pack.packname.isEmpty()) {
            return pack.packname;
        }
    
        if (!pack.state_key.empty()) {
            return QString::fromStdString(pack.state_key);
        }
    
        if (!pack.room_id.empty()) {
            auto info = cache::singleRoomInfo(pack.room_id);
            return QString::fromStdString(info.name);
        }
    
        return tr("Account Pack");
    }
    
    
    QString
    GridImagePackModel::avatarFromPack(const PackDesc &pack) const
    {
        if (!pack.packavatar.isEmpty()) {
            return pack.packavatar;
        }
    
        if (!pack.images.empty()) {
            return QString::fromStdString(pack.images.begin()->first.url);
        }
    
        return "";
    }
    
    QList<SectionDescription>
    GridImagePackModel::sections() const
    {
        QList<SectionDescription> sectionNames;
        if (searchString_.isEmpty()) {
            std::size_t packIdx = -1;
            for (std::size_t i = 0; i < rowToPack.size(); i++) {
                if (rowToPack[i] != packIdx) {
                    const auto &pack = packs[rowToPack[i]];
                    sectionNames.push_back({
                      .name         = nameFromPack(pack),
                      .url          = avatarFromPack(pack),
                      .firstRowWith = static_cast<int>(i),
                    });
                    packIdx = rowToPack[i];
                }
            }
        } else {
            std::uint32_t packIdx = -1;
            int row               = 0;
            for (const auto &i : rowToFirstRowEntryFromSearch) {
                const auto res = currentSearchResult[i];
                if (res.first != packIdx) {
                    packIdx          = res.first;
                    const auto &pack = packs[packIdx];
                    sectionNames.push_back({
                      .name         = nameFromPack(pack),
                      .url          = avatarFromPack(pack),
                      .firstRowWith = row,
                    });
                }
                row++;
            }
        }
    
        return sectionNames;
    }
    
    
    void
    GridImagePackModel::setSearchString(QString key)
    {
        beginResetModel();
        currentSearchResult.clear();
        rowToFirstRowEntryFromSearch.clear();
        searchString_ = key;
    
        if (!key.isEmpty()) {
            auto searchParts = key.toCaseFolded().toUcs4();
            auto tempResults =
              trie_.search(searchParts, static_cast<std::size_t>(columns * columns * 4));
    
    
            std::map<std::uint32_t, std::size_t> firstPositionOfPack;
            for (const auto &e : tempResults)
                firstPositionOfPack.emplace(e.first, firstPositionOfPack.size());
    
            std::ranges::stable_sort(tempResults, [&firstPositionOfPack](auto a, auto b) {
                return firstPositionOfPack[a.first] < firstPositionOfPack[b.first];
            });
    
            currentSearchResult = std::move(tempResults);
    
            std::size_t lastPack = -1;
            int columnIndex      = 0;
            for (std::size_t i = 0; i < currentSearchResult.size(); i++) {
                auto elem = currentSearchResult[i];
                if (elem.first != lastPack || columnIndex == columns) {
                    columnIndex = 0;
                    lastPack    = elem.first;
                    rowToFirstRowEntryFromSearch.push_back(i);
                }
                columnIndex++;
            }
        }
    
        endResetModel();
        emit newSearchString();
    }