#include "name_service.h"

namespace NSQLComplete {

namespace {

void SetPrefix(TString& name, TStringBuf delimeter, const TNamespaced& namespaced) {
    if (namespaced.Namespace.empty()) {
        return;
    }

    name.prepend(delimeter);
    name.prepend(namespaced.Namespace);
}

void FixPrefix(TString& name, TStringBuf delimeter, const TNamespaced& namespaced) {
    if (namespaced.Namespace.empty()) {
        return;
    }

    name.remove(0, namespaced.Namespace.size() + delimeter.size());
}

} // namespace

TGenericName TNameConstraints::Qualified(TGenericName unqualified) const {
    return std::visit([&](auto&& name) -> TGenericName {
        using T = std::decay_t<decltype(name)>;
        if constexpr (std::is_same_v<T, TPragmaName>) {
            SetPrefix(name.Identifier, ".", *Pragma);
        } else if constexpr (std::is_same_v<T, TFunctionName>) {
            SetPrefix(name.Identifier, "::", *Function);
        } else if constexpr (std::is_same_v<T, TClusterName>) {
            SetPrefix(name.Identifier, ":", *Cluster);
        }
        return name;
    }, std::move(unqualified));
}

TGenericName TNameConstraints::Unqualified(TGenericName qualified) const {
    return std::visit([&](auto&& name) -> TGenericName {
        using T = std::decay_t<decltype(name)>;
        if constexpr (std::is_same_v<T, TPragmaName>) {
            FixPrefix(name.Identifier, ".", *Pragma);
        } else if constexpr (std::is_same_v<T, TFunctionName>) {
            FixPrefix(name.Identifier, "::", *Function);
        } else if constexpr (std::is_same_v<T, TClusterName>) {
            FixPrefix(name.Identifier, ":", *Cluster);
        }
        return name;
    }, std::move(qualified));
}

TVector<TGenericName> TNameConstraints::Qualified(TVector<TGenericName> unqualified) const {
    for (auto& name : unqualified) {
        name = Qualified(std::move(name));
    }
    return unqualified;
}

TVector<TGenericName> TNameConstraints::Unqualified(TVector<TGenericName> qualified) const {
    for (auto& name : qualified) {
        name = Unqualified(std::move(name));
    }
    return qualified;
}

} // namespace NSQLComplete