// SPDX-FileCopyrightText: 2023 Contributors to Chatterino <https://chatterino.com>
//
// SPDX-License-Identifier: MIT

#include "controllers/filters/lang/expressions/ListExpression.hpp"

namespace chatterino::filters {

ListExpression::ListExpression(ExpressionList &&list)
    : list_(std::move(list)) {};

QVariant ListExpression::execute(RunContext context) const
{
    QList<QVariant> results;
    bool allStrings = true;
    for (const auto &exp : this->list_)
    {
        auto res = exp->execute(context);
        if (allStrings && variantIsNot(res, QMetaType::QString))
        {
            allStrings = false;
        }
        results.append(res);
    }

    // if everything is a string return a QStringList for case-insensitive comparison
    if (allStrings)
    {
        QStringList strings;
        strings.reserve(results.size());
        for (const auto &val : results)
        {
            strings << val.toString();
        }
        return strings;
    }

    return results;
}

PossibleType ListExpression::synthesizeType() const
{
    std::vector<TypeClass> types;
    types.reserve(this->list_.size());
    bool allStrings = true;
    for (const auto &exp : this->list_)
    {
        auto typSyn = exp->synthesizeType();
        if (isIllTyped(typSyn))
        {
            return typSyn;  // Ill-typed
        }

        auto typ = std::get<TypeClass>(typSyn);

        if (typ != Type::String)
        {
            allStrings = false;
        }

        types.push_back(typ);
    }

    if (types.size() == 2 && types[0] == Type::RegularExpression &&
        types[1] == Type::Int)
    {
        // Specific {RegularExpression, Int} form
        return TypeClass{Type::MatchingSpecifier};
    }

    return allStrings ? TypeClass{Type::StringList} : TypeClass{Type::List};
}

QString ListExpression::debug() const
{
    QStringList debugs;
    for (const auto &exp : this->list_)
    {
        debugs.append(QStringView(u"%1 : %2")
                          .arg(exp->debug(),
                               possibleTypeToString(exp->synthesizeType())));
    }

    return QString("List(%1)").arg(debugs.join(", "));
}

QString ListExpression::filterString() const
{
    QStringList strings;
    for (const auto &exp : this->list_)
    {
        strings.append(exp->filterString());
    }
    return QString("{%1}").arg(strings.join(", "));
}

}  // namespace chatterino::filters
