#include "StringUtils.h"

/// If you're wondering where these came from exactly, then know you're not the only one =D

/// TAKEN FROM Qt, because it doesn't expose it intelligently
static inline QChar getNextChar(const QString& s, int location)
{
    return (location < s.length()) ? s.at(location) : QChar();
}

/// TAKEN FROM Qt, because it doesn't expose it intelligently
int StringUtils::naturalCompare(const QString& s1, const QString& s2, Qt::CaseSensitivity cs)
{
    int l1 = 0, l2 = 0;
    while (l1 <= s1.count() && l2 <= s2.count()) {
        // skip spaces, tabs and 0's
        QChar c1 = getNextChar(s1, l1);
        while (c1.isSpace())
            c1 = getNextChar(s1, ++l1);

        QChar c2 = getNextChar(s2, l2);
        while (c2.isSpace())
            c2 = getNextChar(s2, ++l2);

        if (c1.isDigit() && c2.isDigit()) {
            while (c1.digitValue() == 0)
                c1 = getNextChar(s1, ++l1);
            while (c2.digitValue() == 0)
                c2 = getNextChar(s2, ++l2);

            int lookAheadLocation1 = l1;
            int lookAheadLocation2 = l2;
            int currentReturnValue = 0;
            // find the last digit, setting currentReturnValue as we go if it isn't equal
            for (QChar lookAhead1 = c1, lookAhead2 = c2; (lookAheadLocation1 <= s1.length() && lookAheadLocation2 <= s2.length());
                 lookAhead1 = getNextChar(s1, ++lookAheadLocation1), lookAhead2 = getNextChar(s2, ++lookAheadLocation2)) {
                bool is1ADigit = !lookAhead1.isNull() && lookAhead1.isDigit();
                bool is2ADigit = !lookAhead2.isNull() && lookAhead2.isDigit();
                if (!is1ADigit && !is2ADigit)
                    break;
                if (!is1ADigit)
                    return -1;
                if (!is2ADigit)
                    return 1;
                if (currentReturnValue == 0) {
                    if (lookAhead1 < lookAhead2) {
                        currentReturnValue = -1;
                    } else if (lookAhead1 > lookAhead2) {
                        currentReturnValue = 1;
                    }
                }
            }
            if (currentReturnValue != 0)
                return currentReturnValue;
        }

        if (cs == Qt::CaseInsensitive) {
            if (!c1.isLower())
                c1 = c1.toLower();
            if (!c2.isLower())
                c2 = c2.toLower();
        }

        int r = QString::localeAwareCompare(c1, c2);
        if (r < 0)
            return -1;
        if (r > 0)
            return 1;

        l1 += 1;
        l2 += 1;
    }

    // The two strings are the same (02 == 2) so fall back to the normal sort
    return QString::compare(s1, s2, cs);
}
