#include <qpdf/QPDFObjectHandle_private.hh>

#include <qpdf/QPDFObject_private.hh>

#include <qpdf/QTC.hh>

using namespace std::literals;

using namespace qpdf;

QPDF_Dictionary*

BaseDictionary::dict() const

{

    if (auto d = as<QPDF_Dictionary>()) {

        return d;

    }

    throw std::runtime_error("Expected a dictionary but found a non-dictionary object");

    return nullptr; // unreachable

}

QPDFObjectHandle const&

BaseHandle::operator[](std::string const& key) const

{

    if (auto d = as<QPDF_Dictionary>()) {

        auto it = d->items.find(key);

        if (it != d->items.end()) {

            return it->second;

        }

    }

    static const QPDFObjectHandle null_obj;

    return null_obj;

}

bool

BaseHandle::contains(std::string const& key) const

{

    return !(*this)[key].null();

}

std::set<std::string>

BaseDictionary::getKeys()

{

    std::set<std::string> result;

    for (auto& iter: dict()->items) {

        if (!iter.second.null()) {

            result.insert(iter.first);

        }

    }

    return result;

}

std::map<std::string, QPDFObjectHandle> const&

BaseDictionary::getAsMap() const

{

    return dict()->items;

}

size_t

BaseHandle::erase(const std::string& key)

{

    // no-op if key does not exist

    if (auto d = as<QPDF_Dictionary>()) {

        return d->items.erase(key);

    }

    return 0;

}

void

BaseDictionary::replaceKey(std::string const& key, QPDFObjectHandle value)

{

    auto d = dict();

    if (value.null() && !value.indirect()) {

        // The PDF spec doesn't distinguish between keys with null values and missing keys.

        // Allow indirect nulls which are equivalent to a dangling reference, which is

        // permitted by the spec.

        d->items.erase(key);

    } else {

        // add or replace value

        d->items[key] = value;

    }

}

Dictionary::Dictionary(std::map<std::string, QPDFObjectHandle>&& dict) :

    BaseDictionary(std::move(dict))

{

}

Dictionary::Dictionary(std::shared_ptr<QPDFObject> const& obj) :

    BaseDictionary(obj)

{

}

Dictionary

Dictionary::empty()

{

    return Dictionary(std::map<std::string, QPDFObjectHandle>());

}

void

QPDFObjectHandle::checkOwnership(QPDFObjectHandle const& item) const

{

    auto qpdf = getOwningQPDF();

    auto item_qpdf = item.getOwningQPDF();

    if (qpdf && item_qpdf && qpdf != item_qpdf) {

        throw std::logic_error(

            "Attempting to add an object from a different QPDF. Use "

            "QPDF::copyForeignObject to add objects from another file.");

    }

}

bool

QPDFObjectHandle::hasKey(std::string const& key) const

{

    if (Dictionary dict = *this) {

        return dict.contains(key);

    } else {

        typeWarning("dictionary", "returning false for a key containment request");

        QTC::TC("qpdf", "QPDFObjectHandle dictionary false for hasKey");

        return false;

    }

}

QPDFObjectHandle

QPDFObjectHandle::getKey(std::string const& key) const

{

    if (auto result = (*this)[key]) {

        return result;

    }

    if (isDictionary()) {

        static auto constexpr msg = " -> dictionary key $VD"sv;

        return QPDF_Null::create(obj, msg, key);

    }

    typeWarning("dictionary", "returning null for attempted key retrieval");

    static auto constexpr msg = " -> null returned from getting key $VD from non-Dictionary"sv;

    return QPDF_Null::create(obj, msg, "");

}

QPDFObjectHandle

QPDFObjectHandle::getKeyIfDict(std::string const& key) const

{

    return isNull() ? newNull() : getKey(key);

}

std::set<std::string>

QPDFObjectHandle::getKeys() const

{

    if (auto dict = as_dictionary(strict)) {

        return dict.getKeys();

    }

    typeWarning("dictionary", "treating as empty");

    QTC::TC("qpdf", "QPDFObjectHandle dictionary empty set for getKeys");

    return {};

}

std::map<std::string, QPDFObjectHandle>

QPDFObjectHandle::getDictAsMap() const

{

    if (auto dict = as_dictionary(strict)) {

        return dict.getAsMap();

    }

    typeWarning("dictionary", "treating as empty");

    QTC::TC("qpdf", "QPDFObjectHandle dictionary empty map for asMap");

    return {};

}

void

QPDFObjectHandle::replaceKey(std::string const& key, QPDFObjectHandle const& value)

{

    if (auto dict = as_dictionary(strict)) {

        checkOwnership(value);

        dict.replaceKey(key, value);

        return;

    }

    typeWarning("dictionary", "ignoring key replacement request");

    QTC::TC("qpdf", "QPDFObjectHandle dictionary ignoring replaceKey");

}

QPDFObjectHandle

QPDFObjectHandle::replaceKeyAndGetNew(std::string const& key, QPDFObjectHandle const& value)

{

    replaceKey(key, value);

    return value;

}

QPDFObjectHandle

QPDFObjectHandle::replaceKeyAndGetOld(std::string const& key, QPDFObjectHandle const& value)

{

    QPDFObjectHandle old = removeKeyAndGetOld(key);

    replaceKey(key, value);

    return old;

}

void

QPDFObjectHandle::removeKey(std::string const& key)

{

    if (erase(key) || isDictionary()) {

        return;

    }

    typeWarning("dictionary", "ignoring key removal request");

}

QPDFObjectHandle

QPDFObjectHandle::removeKeyAndGetOld(std::string const& key)

{

    auto result = (*this)[key];

    erase(key);

    return result ? result : newNull();

}