#include "oracleimporter.h"

#include "libcockatrice/interfaces/noop_card_preference_provider.h"
#include "libcockatrice/interfaces/noop_card_set_priority_controller.h"
#include "parsehelpers.h"

#include <QDebug>
#include <QJsonDocument>
#include <QJsonObject>
#include <QJsonParseError>
#include <QRegularExpression>
#include <QSet>
#include <algorithm>
#include <climits>
#include <libcockatrice/card/card_localization.h>
#include <libcockatrice/card/database/parser/cockatrice_xml_4.h>
#include <libcockatrice/card/relation/card_relation.h>

static const QList<AllowedCount> kConstructedCounts = {{4, "legal"}, {0, "banned"}};

static const QList<AllowedCount> kSingletonCounts = {{1, "legal"}, {0, "banned"}};

SplitCardPart::SplitCardPart(const QString &_name,
                             const QString &_text,
                             const QHash<QString, QString> &_properties,
                             const PrintingInfo &_printingInfo,
                             const QString &_localizedText)
    : name(_name), text(_text), localizedText(_localizedText), properties(_properties), printingInfo(_printingInfo)
{
}

const QRegularExpression OracleImporter::formatRegex = QRegularExpression("^format-");

OracleImporter::OracleImporter(QObject *parent) : QObject(parent)
{
}

void OracleImporter::setCardLang(const QString &lang)
{
    cardLang = lang.trimmed().toLower();
    localizationEnabled = cardLang != "en" && CardLocalization::supportedLanguages().contains(cardLang);
}

/**
 * @brief Maps the MTGJSON foreignData language names to the short codes used by
 *        Scryfall and stored in cards.xml (e.g. "German" -> "de").
 * @param language The language name found in the MTGJSON foreignData entries.
 * @return The short language code, or an empty string if unknown.
 */
static QString mtgjsonLanguageToCode(const QString &language)
{
    static const QHash<QString, QString> map = {
        {"Chinese Simplified", "zhs"},
        {"Chinese Traditional", "zht"},
        {"English", "en"},
        {"French", "fr"},
        {"German", "de"},
        {"Greek", "grc"},
        {"Ancient Greek", "grc"},
        {"Hebrew", "he"},
        {"Italian", "it"},
        {"Japanese", "ja"},
        {"Korean", "ko"},
        {"Latin", "la"},
        {"Phyrexian", "ph"},
        {"Portuguese (Brazil)", "pt"},
        {"Russian", "ru"},
        {"Sanskrit", "sa"},
        {"Spanish", "es"},
    };
    return map.value(language);
}

static CardSet::Priority getSetPriority(const QString &setType, const QString &shortName)
{
    if (!setTypePriorities.contains(setType.toLower())) {
        qDebug() << "warning: Set type" << setType << "unrecognized for prioritization";
    }
    CardSet::Priority priority = setTypePriorities.value(setType.toLower(), CardSet::PriorityOther);
    if (nonEnglishSets.contains(shortName)) {
        priority = CardSet::PriorityLowest;
    }
    return priority;
}

bool OracleImporter::readSetsFromByteArray(QByteArray data)
{
    const RawJson::ScanProgressCallback progress =
        progressReporting
            ? [this](
                  qsizetype bytesRead,
                  qsizetype
                      totalBytes) { emit dataReadProgress(static_cast<int>(bytesRead), static_cast<int>(totalBytes)); }
            : RawJson::ScanProgressCallback{};

    RawJson::ScanError error;
    const QList<RawJson::SetRange> ranges = RawJson::scanSetRanges(data, &error, progress);
    if (error.isError()) {
        qDebug() << "error: RawJson::scanSetRanges():" << error.message;
        return false;
    }

    QList<SetToDownload> newSetList;
    newSetList.reserve(ranges.size());

    for (const RawJson::SetRange &range : ranges) {
        QString shortName = range.code.toUpper();
        QString longName = range.name;
        QString setType = range.type;
        QDate releaseDate = QDate::fromString(range.releaseDate, Qt::ISODate);
        CardSet::Priority priority = getSetPriority(setType, shortName);
        // capitalize set type
        if (setType.length() > 0) {
            // basic grammar for words that aren't capitalized, like in "From the Vault"
            static const QStringList noCapitalize = {"the", "a",  "an",  "on",   "to", "for",
                                                     "of",  "in", "and", "with", "or"};
            QStringList words = setType.split("_");
            setType.clear();
            bool first = false;
            for (auto &item : words) {
                if (first && noCapitalize.contains(item)) {
                    setType += item + QString(" ");
                } else {
                    setType += item[0].toUpper() + item.mid(1) + QString(" ");
                    first = true;
                }
            }
            setType = setType.trimmed();
        }
        SetToDownload set(shortName, longName, priority, setType, releaseDate);
        set.setRawRange(range.dataRange);
        newSetList.append(set);
    }

    std::sort(newSetList.begin(), newSetList.end());

    if (newSetList.isEmpty()) {
        return false;
    }
    allSets = newSetList;
    rawSetsData = std::move(data);
    return true;
}

/**
 * The priority order used to pick a card's main type when a card has multiple
 * types (e.g. "Artifact Creature") or multiple faces (e.g. split/adventure cards).
 * A lower index means a higher priority.
 */
static const QStringList MAIN_CARD_TYPE_PRIORITY = {"Planeswalker", "Creature", "Land",       "Sorcery",
                                                    "Instant",      "Artifact", "Enchantment"};

/**
 * Returns the priority (index) of the given main card type. Known types map to their
 * position in {@link mainCardTypePriority()}, unknown types map to -1 (lowest priority).
 */
static int mainCardTypePriority(const QString &mainCardType)
{
    return MAIN_CARD_TYPE_PRIORITY.indexOf(mainCardType);
}

static QString getMainCardType(const QStringList &typeList)
{
    if (typeList.isEmpty()) {
        return {};
    }

    for (const auto &type : MAIN_CARD_TYPE_PRIORITY) {
        if (typeList.contains(type)) {
            return type;
        }
    }

    return typeList.first();
}

/**
 * Sorts and deduplicates the color chars in the string by WUBRG order.
 *
 * @param colors The string containing the color chars. Will be modified in-place
 */
static void sortAndReduceColors(QString &colors)
{
    // sort
    static const QHash<QChar, unsigned int> colorOrder{{'W', 0}, {'U', 1}, {'B', 2}, {'R', 3}, {'G', 4}};
    std::sort(colors.begin(), colors.end(),
              [](const QChar a, const QChar b) { return colorOrder.value(a, INT_MAX) < colorOrder.value(b, INT_MAX); });
    // reduce
    auto last = std::unique(colors.begin(), colors.end());
    colors.erase(last, colors.end());
}

CardInfoPtr OracleImporter::addCard(QString name,
                                    const QString &text,
                                    bool isToken,
                                    QHash<QString, QString> properties,
                                    const QList<CardRelation *> &relatedCards,
                                    const PrintingInfo &printingInfo)
{
    // Workaround for card name weirdness
    name = name.replace("Æ", "AE");
    name = name.replace("’", "'");
    auto existingIt = cards.constFind(name);
    if (existingIt != cards.constEnd()) {
        CardInfoPtr card = existingIt.value();
        card->addToSet(printingInfo.getSet(), printingInfo);
        // Only merge legalities when the card has none yet, so multi-format
        // printings don't overwrite each other's legality lists.
        if (card->getProperties().filter(formatRegex).empty()) {
            card->combineLegalities(properties);
        }
        return card;
    }

    // Remove {} around mana costs, except if it's split cost
    QString manacost = properties.value("manacost");
    if (!manacost.isEmpty()) {
        QStringList symbols = manacost.split("}");
        QString formattedCardCost;
        for (QString symbol : symbols) {
            static const auto manaCostPattern = QRegularExpression("[0-9WUBGRP]/[0-9WUBGRP]");
            if (symbol.contains(manaCostPattern)) {
                symbol.append("}");
            } else {
                symbol.remove(QChar('{'));
            }
            formattedCardCost.append(symbol);
        }
        properties.insert("manacost", formattedCardCost);
    }

    // fix colors
    QString allColors = properties.value("colors");
    if (allColors.size() > 1) {
        sortAndReduceColors(allColors);
        properties.insert("colors", allColors);
    }
    QString allColorIdent = properties.value("coloridentity");
    if (allColorIdent.size() > 1) {
        sortAndReduceColors(allColorIdent);
        properties.insert("coloridentity", allColorIdent);
    }

    // DETECT CARD POSITIONING INFO

    QString layoutVal = properties.value("layout");
    bool landscapeOrientation =
        properties.value("maintype") == "Battle" || layoutVal == "split" || layoutVal == "planar";

    // cards that enter the field tapped
    bool cipt = parseCipt(name, text) || landscapeOrientation;

    // table row
    int tableRow = 1;
    QString mainCardType = properties.value("maintype");
    if (mainCardType == "Land") {
        tableRow = 0;
    } else if (mainCardType == "Sorcery" || mainCardType == "Instant") {
        tableRow = 3;
    } else if (mainCardType == "Creature") {
        tableRow = 2;
    }

    // card side
    QString side = properties.value("side") == "b" ? "back" : "front";
    properties.insert("side", side);

    // upsideDown (flip cards)
    QString layout = properties.value("layout");
    bool upsideDown = layout == "flip" && side == "back";

    // insert the card and its properties
    SetToPrintingsMap setsInfo;
    setsInfo[printingInfo.getSet()->getShortName()].append(printingInfo);
    CardInfo::UiAttributes attributes = {cipt, landscapeOrientation, tableRow, upsideDown};
    CardInfoPtr newCard =
        CardInfo::newInstance(name, text, isToken, properties, relatedCards, {}, setsInfo, attributes);

    if (name.isEmpty()) {
        qDebug() << "warning: an empty card was added to set" << printingInfo.getSet()->getShortName();
    }
    cards.insert(name, newCard);

    return newCard;
}

static QString getJsonString(const QJsonObject &obj, const QString &key)
{
    // QVariant coerces numbers and booleans to text, while QJsonValue::toString()
    // returns a null string for them — some MTGJSON fields (manaValue,
    // convertedManaCost, isOnlineOnly, isRebalanced) carry those types.
    return obj.value(key).toVariant().toString();
}

static QString normalizeCardName(QString name)
{
    // Mirror of the name cleanup applied in addCard(), so collected localization
    // keys line up with the card map keys (Æ → AE, curly apostrophe → straight).
    name = name.replace("Æ", "AE");
    name = name.replace("’", "'");
    return name;
}

static QString matchingForeignEntryText(const QJsonObject &card, const QString &cardLang)
{
    // Multi-face cards (split/aftermath/adventure/prepare) expose each face as a
    // separate card object, each with its own foreignData entry carrying that
    // face's rules text; single-face cards carry the full text in one entry.
    const QJsonArray foreignData = card.value("foreignData").toArray();
    for (const QJsonValue &entryValue : foreignData) {
        const QJsonObject entry = entryValue.toObject();
        // MTGJSON reports languages by long-form name ("German"); match the
        // short code ("de") that Scryfall and cards.xml use.
        if (mtgjsonLanguageToCode(getJsonString(entry, "language")) == cardLang) {
            return getJsonString(entry, "text");
        }
    }
    return QString();
}

void OracleImporter::collectForeignData(const QString &cardKey,
                                        const CardSetPtr &currentSet,
                                        const QJsonObject &card,
                                        bool collectText)
{
    if (!localizationEnabled) {
        return;
    }

    LocalizedCardEntry incoming;
    bool found = false;
    const QJsonArray foreignData = card.value("foreignData").toArray();
    for (const QJsonValue &entryValue : foreignData) {
        const QJsonObject entry = entryValue.toObject();
        // MTGJSON reports languages by long-form name ("German"); match the
        // short code ("de") that Scryfall and cards.xml use.
        if (mtgjsonLanguageToCode(getJsonString(entry, "language")) != cardLang) {
            continue;
        }
        incoming.name = getJsonString(entry, "name");
        incoming.text = collectText ? getJsonString(entry, "text") : QString();
        found = true;
        break;
    }
    if (!found) {
        return;
    }

    // Prefer the entry from the highest-priority set (lower enum value = more
    // authoritative); printings of equal priority keep the first one seen.
    incoming.priority = currentSet->getPriority();
    const auto existing = localizedEntries.constFind(cardKey);
    if (existing == localizedEntries.constEnd() || incoming.priority < existing->priority) {
        localizedEntries.insert(cardKey, incoming);
    }
}

void OracleImporter::applyLocalizedData()
{
    if (!localizationEnabled) {
        return;
    }
    for (auto it = localizedEntries.constBegin(); it != localizedEntries.constEnd(); ++it) {
        CardInfoPtr card = cards.value(it.key());
        if (card.isNull()) {
            continue;
        }
        const LocalizedCardEntry &entry = it.value();
        if (!entry.name.isEmpty()) {
            card->setLocalizedName(cardLang, entry.name);
        }
        if (!entry.text.isEmpty()) {
            card->setLocalizedText(cardLang, entry.text);
        }
    }
    localizedEntries.clear();

    for (auto it = splitLocalizedTexts.constBegin(); it != splitLocalizedTexts.constEnd(); ++it) {
        CardInfoPtr card = cards.value(it.key());
        if (card.isNull()) {
            continue;
        }
        if (!it.value().text.isEmpty()) {
            card->setLocalizedText(cardLang, it.value().text);
        }
    }
    splitLocalizedTexts.clear();
}

int OracleImporter::importCardsFromSet(const CardSetPtr &currentSet, const QJsonArray &cardsList)
{
    // mtgjson name => xml name
    static const QMap<QString, QString> cardProperties{
        {"manaCost", "manacost"},     {"manaValue", "cmc"}, {"type", "type"},
        {"loyalty", "loyalty"},       {"layout", "layout"}, {"side", "side"},
        {"convertedManaCost", "cmc"}, // old name for manaValue, for backwards compatibility
    };

    // mtgjson name => xml name
    static const QMap<QString, QString> setInfoProperties{{"number", "num"},
                                                          {"rarity", "rarity"},
                                                          {"isOnlineOnly", "isOnlineOnly"},
                                                          {"isRebalanced", "isRebalanced"},
                                                          {"artist", "artist"}};

    // mtgjson name => xml name
    static const QMap<QString, QString> identifierProperties{{"multiverseId", "muid"}, {"scryfallId", "uuid"}};

    static const QString ptSeparator = "/";
    static constexpr bool isToken = false;
    static const QSet<QString> setsWithCardsWithSameNameButDifferentText = {"UST"};

    int numCards = 0;

    // Keeps track of any split card faces encountered so far
    QMap<QString, QPair<QList<SplitCardPart>, QString>> splitCards;

    // Keeps track of all names encountered so far
    QSet<QString> allNameProps;

    for (const QJsonValue &cardVal : cardsList) {
        QJsonObject card = cardVal.toObject();

        /* Currently used layouts are:
         * augment, double_faced_token, flip, host, leveler, meld, normal, planar,
         * saga, scheme, split, token, transform, vanguard
         */
        QString layout = getJsonString(card, "layout");

        // don't import tokens from the json file
        if (layout == "token") {
            continue;
        }

        // normal cards handling
        QString name = getJsonString(card, "name");
        QString text = getJsonString(card, "text");
        QString faceName = getJsonString(card, "faceName");
        if (faceName.isEmpty()) {
            faceName = name;
        }

        // card properties
        QHash<QString, QString> properties;
        for (auto i = cardProperties.cbegin(), end = cardProperties.cend(); i != end; ++i) {
            QString propertyValue = getJsonString(card, i.key());
            if (!propertyValue.isEmpty()) {
                properties.insert(i.value(), propertyValue);
            }
        }

        // per-set properties
        QHash<QString, QString> printingProps;
        for (auto i = setInfoProperties.cbegin(), end = setInfoProperties.cend(); i != end; ++i) {
            QString propertyValue = getJsonString(card, i.key());
            if (!propertyValue.isEmpty()) {
                printingProps.insert(i.value(), propertyValue);
            }
        }

        // handle flavorNames specially due to double-faced cards
        QString faceFlavorName = getJsonString(card, "faceFlavorName");
        QString flavorName = !faceFlavorName.isEmpty() ? faceFlavorName : getJsonString(card, "flavorName");
        if (!flavorName.isEmpty()) {
            printingProps.insert("flavorName", flavorName);
        }

        // Identifiers
        QJsonObject identifiers = card.value("identifiers").toObject();
        for (auto i = identifierProperties.cbegin(), end = identifierProperties.cend(); i != end; ++i) {
            QString propertyValue = getJsonString(identifiers, i.key());
            if (!propertyValue.isEmpty()) {
                printingProps.insert(i.value(), propertyValue);
            }
        }

        PrintingInfo printingInfo(currentSet, LazyPropertiesHash(printingProps));

        QString numComponent;
        const QString numProperty = printingInfo.getProperty("num");
        const QChar lastChar = numProperty.isEmpty() ? QChar() : numProperty.back();

        // Un-Sets do some wonky stuff. Split up these cards as individual entries.
        // these cards will have a num with a letter (abc) behind it, put that letter into the name
        if (setsWithCardsWithSameNameButDifferentText.contains(currentSet->getShortName()) &&
            allNameProps.contains(faceName) && layout == "normal" && lastChar.isLetter()) {
            numComponent = " (" + QString(lastChar).toLower() + ")";
        }
        allNameProps.insert(faceName);

        // special handling properties
        QString colors;
        for (const QJsonValue &color : card.value("colors").toArray()) {
            colors += color.toString();
        }
        if (!colors.isEmpty()) {
            properties.insert("colors", colors);
        }

        QString colorIdentity;
        for (const QJsonValue &color : card.value("colorIdentity").toArray()) {
            colorIdentity += color.toString();
        }
        if (!colorIdentity.isEmpty()) {
            properties.insert("coloridentity", colorIdentity);
        }

        const auto &mainCardType = getMainCardType(card.value("types").toVariant().toStringList());
        if (mainCardType.isEmpty()) {
            qDebug() << "warning: no mainCardType for card:" << name;
        } else {
            properties.insert("maintype", mainCardType);
        }

        // Depending on whether power and/or toughness are present, the format
        // is either P/T (most common), P (no toughness), or /T (no power).
        QString power = getJsonString(card, "power");
        QString toughness = getJsonString(card, "toughness");
        if (toughness.isEmpty() && !power.isEmpty()) {
            properties.insert("pt", power);
        } else if (!toughness.isEmpty()) {
            properties.insert("pt", power + ptSeparator + toughness);
        }

        auto legalities = card.value("legalities").toObject();
        for (auto i = legalities.constBegin(), end = legalities.constEnd(); i != end; ++i) {
            properties.insert(QString("format-%1").arg(i.key()), i.value().toString().toLower());
        }

        // split cards are considered a single card, enqueue for later merging
        if (layout == "split" || layout == "aftermath" || layout == "adventure" || layout == "prepare") {
            auto _faceName = getJsonString(card, "faceName");
            // MTGJSON exposes each face as a separate card object, each with its
            // own foreignData entry holding that face's rules text; collect it so
            // the per-face texts can be joined the same way as the English text.
            const QString faceLocalizedText =
                localizationEnabled ? matchingForeignEntryText(card, cardLang) : QString();
            SplitCardPart split(_faceName, text, properties, printingInfo, faceLocalizedText);
            auto found_iter = splitCards.find(name + numProperty);
            if (found_iter == splitCards.end()) {
                splitCards.insert(name + numProperty, {{split}, name});
            } else {
                found_iter->first.append(split);
            }
            // MTGJSON's foreignData name is the joined name present on every
            // face, so collect the name once.
            collectForeignData(normalizeCardName(name), currentSet, card, false);
        } else {
            // relations
            QList<CardRelation *> relatedCards;

            // add other face for split cards as card relation
            if (!getJsonString(card, "side").isEmpty()) {
                auto faceManaValue = getJsonString(card, "faceManaValue");
                if (faceManaValue.isEmpty()) {
                    // check the old name for the property, for backwards compatibility purposes
                    faceManaValue = getJsonString(card, "faceConvertedManaCost");
                }
                properties["cmc"] = faceManaValue;

                if (layout == "meld") { // meld cards don't work
                    static const QRegularExpression meldNameRegex{"then meld them into ([^\\.]*)"};
                    QString additionalName = meldNameRegex.match(text).captured(1);
                    if (!additionalName.isNull()) {
                        relatedCards.append(new CardRelation(additionalName, CardRelationType::TransformInto));
                    }
                } else {
                    for (const QString &additionalName : name.split(" // ")) {
                        if (additionalName != faceName) {
                            relatedCards.append(new CardRelation(additionalName, CardRelationType::TransformInto));
                        }
                    }
                }
                name = faceName;
            }

            // mtgjson related cards
            QJsonObject givenRelated = card.value("relatedCards").toObject();
            if (!givenRelated.isEmpty()) {
                // conjured cards from a spellbook
                QJsonArray spellbook = givenRelated.value("spellbook").toArray();
                if (!spellbook.isEmpty()) {
                    for (const QJsonValue &spbkVal : spellbook) {
                        relatedCards.append(new CardRelation(spbkVal.toString(), CardRelationType::DoesNotAttach, false,
                                                             false, 1, true));
                    }
                }
            }

            collectForeignData(normalizeCardName(name + numComponent), currentSet, card);

            CardInfoPtr newCard =
                addCard(name + numComponent, text, isToken, std::move(properties), relatedCards, printingInfo);
            numCards++;
        }
    }

    // split cards handling
    static const QString splitCardPropSeparator = QString(" // ");
    static const QString splitCardTextSeparator = QString("\n\n---\n\n");

    QList<QPair<QList<SplitCardPart>, QString>> partsAndNames = splitCards.values();
    for (auto [splitCardParts, name] : partsAndNames) {
        QString text;
        QString localizedText;
        bool localizedTextComplete = true;
        QHash<QString, QString> properties;
        PrintingInfo printingInfo;

        for (const SplitCardPart &tmp : splitCardParts) {
            if (!text.isEmpty()) {
                text.append(splitCardTextSeparator);
            }
            text.append(tmp.getText());

            // Build the cardLang text by joining each face's translated text with
            // the same separator as the English text. Any face missing a complete
            // translation abandons the whole join, falling back to the English text.
            if (localizedTextComplete) {
                const QString partLocalizedText = tmp.getLocalizedText();
                if (partLocalizedText.isEmpty()) {
                    localizedTextComplete = false;
                } else {
                    if (!localizedText.isEmpty()) {
                        localizedText.append(splitCardTextSeparator);
                    }
                    localizedText.append(partLocalizedText);
                }
            }

            if (properties.isEmpty()) {
                properties = tmp.getProperties();
                printingInfo = tmp.getPrintingInfo();
            } else {
                const QHash<QString, QString> &tmpProps = tmp.getProperties();
                for (auto i = tmpProps.cbegin(), end = tmpProps.cend(); i != end; ++i) {
                    QString prop = i.key();
                    QString originalPropertyValue = properties.value(prop);
                    QString thisCardPropertyValue = i.value();
                    if (!thisCardPropertyValue.isEmpty() && originalPropertyValue != thisCardPropertyValue) {
                        if (originalPropertyValue.isEmpty()) { // don't create //es if one field is empty
                            properties.insert(prop, thisCardPropertyValue);
                        } else if (prop == "colors" || prop == "coloridentity") { // the card is both colors
                            properties.insert(prop, originalPropertyValue + thisCardPropertyValue);
                        } else if (prop == "maintype") {
                            // Use the same priority as getMainCardType() to pick the
                            // "best" type across faces — e.g. Creature over Instant
                            // for adventure cards like Bonecrusher Giant.
                            int currentPriority = mainCardTypePriority(originalPropertyValue);
                            int newPriority = mainCardTypePriority(thisCardPropertyValue);
                            if (newPriority >= 0 && (currentPriority < 0 || newPriority < currentPriority)) {
                                properties.insert(prop, thisCardPropertyValue);
                            }
                        } else {
                            properties.insert(prop,
                                              originalPropertyValue + splitCardPropSeparator + thisCardPropertyValue);
                        }
                    }
                }
            }
        }
        CardInfoPtr newCard = addCard(name, text, isToken, std::move(properties), {}, printingInfo);
        if (localizationEnabled && localizedTextComplete && !localizedText.isEmpty()) {
            // Same priority policy as collectForeignData(): the joined text from the
            // highest-priority set seen so far wins, applied once all printings are in.
            LocalizedCardEntry entry;
            entry.text = localizedText;
            entry.priority = currentSet->getPriority();
            const QString entryKey = normalizeCardName(name);
            const auto existing = splitLocalizedTexts.constFind(entryKey);
            if (existing == splitLocalizedTexts.constEnd() || entry.priority < existing->priority) {
                splitLocalizedTexts.insert(entryKey, entry);
            }
        }
        numCards++;
    }

    return numCards;
}

static FormatRulesNameMap buildDefaultMagicFormats()
{
    // Predefined common exceptions
    CardCondition superTypeIsBasic;
    superTypeIsBasic.field = "type";
    superTypeIsBasic.matchType = "regex";
    superTypeIsBasic.value = R"(\bBasic\b[^—]+\bLand\b)";

    ExceptionRule basicLands;
    basicLands.conditions.append(superTypeIsBasic);

    CardCondition anyNumberAllowed;
    anyNumberAllowed.field = "text";
    anyNumberAllowed.matchType = "contains";
    anyNumberAllowed.value = "A deck can have any number of";

    ExceptionRule mayContainAnyNumber;
    mayContainAnyNumber.conditions.append(anyNumberAllowed);

    FormatRulesNameMap defaultFormatRulesNameMap;

    // ----------------- Helper lambda to create format -----------------
    auto makeFormat = [&](const QString &name, int minDeck = 60, int maxDeck = -1, int maxSideboardSize = 15,
                          const QList<AllowedCount> &allowedCounts = kConstructedCounts) -> FormatRulesPtr {
        FormatRulesPtr f(new FormatRules);
        f->formatName = name;
        f->allowedCounts = allowedCounts;
        f->minDeckSize = minDeck;
        f->maxDeckSize = maxDeck;
        f->maxSideboardSize = maxSideboardSize;
        f->exceptions.append(basicLands);
        f->exceptions.append(mayContainAnyNumber);
        defaultFormatRulesNameMap.insert(name.toLower(), f);
        return f;
    };

    // ----------------- Standard formats -----------------
    makeFormat("Standard");
    makeFormat("Modern");
    makeFormat("Legacy");
    makeFormat("Pioneer");
    makeFormat("Historic");
    makeFormat("Timeless");
    makeFormat("Future");
    makeFormat("OldSchool");
    makeFormat("Premodern");
    makeFormat("Pauper");
    makeFormat("Penny");

    // ----------------- Singleton formats -----------------
    makeFormat("Commander", 100, 100, 15, kSingletonCounts);
    makeFormat("Duel", 100, 100, 15, kSingletonCounts);
    makeFormat("Brawl", 60, 60, 15, kSingletonCounts);
    makeFormat("StandardBrawl", 60, 60, 15, kSingletonCounts);
    makeFormat("Oathbreaker", 60, 60, 15, kSingletonCounts);
    makeFormat("PauperCommander", 100, 100, 15, kSingletonCounts);
    makeFormat("Predh", 100, 100, 15, kSingletonCounts);

    // ----------------- Restricted formats -----------------
    makeFormat("Vintage", 60, -1, 15, {{4, "legal"}, {1, "restricted"}, {0, "banned"}});

    return defaultFormatRulesNameMap;
}

const FormatRulesNameMap &OracleImporter::createDefaultMagicFormats()
{
    static const FormatRulesNameMap cached = buildDefaultMagicFormats();
    return cached;
}

int OracleImporter::startImport()
{
    static ICardSetPriorityController *noOpController = new NoopCardSetPriorityController();

    importCancelled.storeRelease(0);

    // Pre-allocate the cards hash to avoid rehashing during import. Keys are
    // distinct card names while raw ranges only count printings (AllPrintings
    // ~100k printings vs ~35k names), so this over-reserves somewhat; an exact
    // distinct-name count would require eagerly parsing, which the lazy reader
    // deliberately avoids. It's a capacity hint, so the overshoot is harmless.
    int estimatedCards = 0;
    for (const SetToDownload &curSetToParse : allSets) {
        estimatedCards += curSetToParse.getRawRange().cardCount;
    }
    cards.reserve(estimatedCards);

    // add an empty set for tokens
    CardSetPtr tokenSet =
        CardSet::newInstance(noOpController, CardSet::TOKENS_SETNAME, tr("Dummy set containing tokens"), "Tokens");
    sets.insert(CardSet::TOKENS_SETNAME, tokenSet);

    int setIndex = 0;

    for (const SetToDownload &curSetToParse : allSets) {
        if (importCancelled.loadAcquire()) {
            // The wizard was closed mid-import: stop at the next set boundary so
            // the caller can wait for this future without processing every set.
            break;
        }

        CardSetPtr newSet = CardSet::newInstance(noOpController, curSetToParse.getShortName(),
                                                 curSetToParse.getLongName(), curSetToParse.getSetType(),
                                                 curSetToParse.getReleaseDate(), curSetToParse.getPriority());

        // parse only this set's slice of the raw document so the whole JSON tree is
        // never kept in memory at once
        const RawJson::SetDataRange &rawRange = curSetToParse.getRawRange();
        const qsizetype rangeEnd = rawRange.start + rawRange.length;
        if (rawRange.start < 0 || rawRange.length <= 0 || rangeEnd > rawSetsData.size()) {
            // rawSetsData is cleared by releaseSetData() while SetToDownload copies
            // taken from getSets() keep their ranges, and nothing else enforces the
            // pairing — so never index past the buffer on stale/mismatched ranges.
            qWarning() << "error: out-of-bounds raw range for set" << curSetToParse.getShortName() << "skipping";
            ++setIndex;
            emit setIndexChanged(0, setIndex, curSetToParse.getLongName());
            continue;
        }
        // sliced() shares the buffer instead of deep-copying the slice; the largest
        // sets in AllPrintings are tens of MB, so the copy is worth avoiding here.
        const QByteArray setBytes = rawSetsData.sliced(rawRange.start, rawRange.length);
        QJsonParseError parseError;
        const QJsonDocument setDoc = QJsonDocument::fromJson(setBytes, &parseError);
        if (parseError.error != QJsonParseError::NoError) {
            qWarning() << "error: parsing card data for set" << curSetToParse.getShortName() << ":"
                       << parseError.errorString();
            ++setIndex;
            // Keep the progress accounting honest: a set that failed to parse
            // still advanced the index, so report it (with zero imported cards)
            // rather than letting SaveSetsPage's bar stall per failed set.
            emit setIndexChanged(0, setIndex, curSetToParse.getLongName());
            continue;
        }

        // Only add the set to the database once its slice parsed cleanly;
        // a set that fails here must not persist as an empty set in cards.xml.
        if (!sets.contains(newSet->getShortName())) {
            sets.insert(newSet->getShortName(), newSet);
        }

        const QJsonArray setCards = setDoc.object().value("cards").toArray();
        int numCardsInSet = importCardsFromSet(newSet, setCards);

        ++setIndex;

        emit setIndexChanged(numCardsInSet, setIndex, curSetToParse.getLongName());
    }

    applyLocalizedData();

    emit setIndexChanged(0, setIndex, QString());

    // total number of sets
    return setIndex;
}

bool OracleImporter::saveToFile(const QString &fileName, const QString &sourceUrl, const QString &sourceVersion)
{
    CockatriceXml4Parser parser(new NoopCardPreferenceProvider(), new NoopCardSetPriorityController());

    return parser.saveToFile(createDefaultMagicFormats(), sets, cards, fileName, sourceUrl, sourceVersion);
}

void OracleImporter::releaseSetData()
{
    allSets.clear();
    rawSetsData.clear();
}

void OracleImporter::clear()
{
    sets.clear();
    cards.clear();
    allSets.clear();
    rawSetsData.clear();
    localizedEntries.clear();
    splitLocalizedTexts.clear();
}