/* Copyright (C) 2013
 * swift project Community / Contributors
 *
 * This file is part of swift project. It is subject to the license terms in the LICENSE file found in the top-level
 * directory of this distribution and at http://www.swift-project.org/license.html. No part of swift project,
 * including this file, may be copied, modified, propagated, or distributed except according to the terms
 * contained in the LICENSE file.
 */

#include "blackmisc/aviation/selcal.h"

using namespace BlackMisc::PhysicalQuantities;

namespace BlackMisc
{
    namespace Aviation
    {

        QList<CFrequency> CSelcal::frequencyEquivalents = QList<CFrequency>();
        QStringList CSelcal::allCodePairs = QStringList();

        QString CSelcal::convertToQString(bool /** i18n **/) const
        {
            return this->m_code;
        }

        bool CSelcal::equalsString(const QString &code) const
        {
            if (code.isEmpty()) return false;
            return (this->m_code.compare(code, Qt::CaseInsensitive) == 0);
        }

        QList<CFrequency> CSelcal::getFrequencies() const
        {
            QList<CFrequency> f;
            if (!CSelcal::isValidCode(this->m_code)) return f;
            for (int pos = 0; pos < this->m_code.length(); pos++)
            {
                f.append(CSelcal::audioFrequencyEquivalent(this->m_code.at(pos)));
            }
            return f;
        }

        const QString &CSelcal::validCharacters()
        {
            static const QString valid = "ABCDEFGHJKLMPQRS";
            return valid;
        }

        bool CSelcal::isValidCharacter(QChar c)
        {
            return CSelcal::validCharacters().contains(c.toUpper());
        }

        bool CSelcal::isValidCode(const QString &code)
        {
            if (code.length() != 4) return false;
            int p1, p2, p3, p4;
            QString codeUpper = code.toUpper();
            if ((p1 = CSelcal::validCharacters().indexOf(codeUpper.at(0))) < 0) return false;
            if ((p2 = CSelcal::validCharacters().indexOf(codeUpper.at(1))) < 0) return false;
            if ((p3 = CSelcal::validCharacters().indexOf(codeUpper.at(2))) < 0) return false;
            if ((p4 = CSelcal::validCharacters().indexOf(codeUpper.at(3))) < 0) return false;
            if (p1 >= p2 || p3 >= p4) return false; // pair in alphabetical order
            if (p1 == p3 || p2 == p3 || p2 == p4 || p3 == p4) return false; // given letter can be used only once in a SELCAL code
            return true;
        }

        const PhysicalQuantities::CFrequency &CSelcal::audioFrequencyEquivalent(QChar c)
        {
            if (CSelcal::frequencyEquivalents.isEmpty())
            {
                QList<CFrequency> frequencies;
                frequencies
                        << CFrequency(312.7, CFrequencyUnit::Hz())
                        << CFrequency(346.7, CFrequencyUnit::Hz())
                        << CFrequency(384.6, CFrequencyUnit::Hz())
                        << CFrequency(426.6, CFrequencyUnit::Hz())
                        << CFrequency(473.2, CFrequencyUnit::Hz())
                        << CFrequency(524.8, CFrequencyUnit::Hz())
                        << CFrequency(582.1, CFrequencyUnit::Hz())
                        << CFrequency(645.7, CFrequencyUnit::Hz())
                        << CFrequency(716.1, CFrequencyUnit::Hz())
                        << CFrequency(794.3, CFrequencyUnit::Hz())
                        << CFrequency(881.0, CFrequencyUnit::Hz())
                        << CFrequency(977.2, CFrequencyUnit::Hz())
                        << CFrequency(1083.9, CFrequencyUnit::Hz())
                        << CFrequency(1202.3, CFrequencyUnit::Hz())
                        << CFrequency(1333.5, CFrequencyUnit::Hz())
                        << CFrequency(1479.1, CFrequencyUnit::Hz());
                CSelcal::frequencyEquivalents = frequencies;
            }
            int pos = CSelcal::validCharacters().indexOf(c);
            Q_ASSERT(pos >= 0);
            Q_ASSERT(CSelcal::frequencyEquivalents.size() > pos);
            return CSelcal::frequencyEquivalents.at(pos);
        }

        const QStringList &CSelcal::codePairs()
        {
            if (CSelcal::allCodePairs.isEmpty())
            {
                QStringList pairs;
                for (int p1 = 0; p1 < (CSelcal::validCharacters().length() - 1); p1++)
                {
                    for (int p2 = p1 + 1; p2 < CSelcal::validCharacters().length(); p2++)
                    {
                        QString pair;
                        pair.append(CSelcal::validCharacters().at(p1)).append(CSelcal::validCharacters().at(p2));
                        pairs.append(pair);
                    }
                }
                CSelcal::allCodePairs = pairs;
            }
            return CSelcal::allCodePairs;
        }

    } // namespace
} // namespace