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#include <com/sun/star/i18n/CTLScriptType.hpp>
#include <com/sun/star/i18n/ScriptDirection.hpp>
#include <com/sun/star/i18n/UnicodeScript.hpp>
#include <scripttypedetector.hxx>
#include <i18nutil/unicode.hxx>

//      ----------------------------------------------------
//      class ScriptTypeDetector
//      ----------------------------------------------------;

using namespace com::sun::star::i18n;

ScriptTypeDetector::ScriptTypeDetector()
{
}

ScriptTypeDetector::~ScriptTypeDetector()
{
}

static sal_Int16 scriptDirection[] = {
    ScriptDirection::LEFT_TO_RIGHT,     // DirectionProperty_LEFT_TO_RIGHT = 0,
    ScriptDirection::RIGHT_TO_LEFT,     // DirectionProperty_RIGHT_TO_LEFT = 1,
    ScriptDirection::LEFT_TO_RIGHT,     // DirectionProperty_EUROPEAN_NUMBER = 2,
    ScriptDirection::LEFT_TO_RIGHT,     // DirectionProperty_EUROPEAN_NUMBER_SEPARATOR = 3,
    ScriptDirection::LEFT_TO_RIGHT,     // DirectionProperty_EUROPEAN_NUMBER_TERMINATOR = 4,
    ScriptDirection::RIGHT_TO_LEFT,     // DirectionProperty_ARABIC_NUMBER = 5,
    ScriptDirection::NEUTRAL,           // DirectionProperty_COMMON_NUMBER_SEPARATOR = 6,
    ScriptDirection::NEUTRAL,           // DirectionProperty_BLOCK_SEPARATOR = 7,
    ScriptDirection::NEUTRAL,           // DirectionProperty_SEGMENT_SEPARATOR = 8,
    ScriptDirection::NEUTRAL,           // DirectionProperty_WHITE_SPACE_NEUTRAL = 9,
    ScriptDirection::NEUTRAL,           // DirectionProperty_OTHER_NEUTRAL = 10,
    ScriptDirection::LEFT_TO_RIGHT,     // DirectionProperty_LEFT_TO_RIGHT_EMBEDDING = 11,
    ScriptDirection::LEFT_TO_RIGHT,     // DirectionProperty_LEFT_TO_RIGHT_OVERRIDE = 12,
    ScriptDirection::RIGHT_TO_LEFT,     // DirectionProperty_RIGHT_TO_LEFT_ARABIC = 13,
    ScriptDirection::RIGHT_TO_LEFT,     // DirectionProperty_RIGHT_TO_LEFT_EMBEDDING = 14,
    ScriptDirection::RIGHT_TO_LEFT,     // DirectionProperty_RIGHT_TO_LEFT_OVERRIDE = 15,
    ScriptDirection::NEUTRAL,           // DirectionProperty_POP_DIRECTIONAL_FORMAT = 16,
    ScriptDirection::NEUTRAL,           // DirectionProperty_DIR_NON_SPACING_MARK = 17,
    ScriptDirection::NEUTRAL,           // DirectionProperty_BOUNDARY_NEUTRAL = 18,
};

sal_Int16 SAL_CALL
ScriptTypeDetector::getScriptDirection( const ::rtl::OUString& Text, sal_Int32 nPos, sal_Int16 defaultScriptDirection ) throw (::com::sun::star::uno::RuntimeException)
{
    sal_Int16 dir = scriptDirection[unicode::getUnicodeDirection(Text[nPos])];
    return (dir == ScriptDirection::NEUTRAL) ? defaultScriptDirection : dir;
}

// return value '-1' means either the direction on nPos is not same as scriptDirection or nPos is out of range.
sal_Int32 SAL_CALL
ScriptTypeDetector::beginOfScriptDirection( const ::rtl::OUString& Text, sal_Int32 nPos, sal_Int16 direction ) throw (::com::sun::star::uno::RuntimeException)
{
        sal_Int32 cPos = nPos;

        if (cPos < Text.getLength()) {
            for (; cPos >= 0; cPos--) {
                if (direction != getScriptDirection(Text, cPos, direction))
                    break;
            }
        }
        return cPos == nPos ? -1 : cPos + 1;
}

sal_Int32 SAL_CALL
ScriptTypeDetector::endOfScriptDirection( const ::rtl::OUString& Text, sal_Int32 nPos, sal_Int16 direction ) throw (::com::sun::star::uno::RuntimeException)
{
        sal_Int32 cPos = nPos;
        sal_Int32 len = Text.getLength();

        if (cPos >=0) {
            for (; cPos < len; cPos++) {
                if (direction != getScriptDirection(Text, cPos, direction))
                    break;
            }
        }
        return cPos == nPos ? -1 : cPos;
}

sal_Int16 SAL_CALL
ScriptTypeDetector::getCTLScriptType( const ::rtl::OUString& Text, sal_Int32 nPos ) throw (::com::sun::star::uno::RuntimeException)
{
    static ScriptTypeList typeList[] = {
        { UnicodeScript_kHebrew, UnicodeScript_kHebrew, CTLScriptType::CTL_HEBREW },    // 10
        { UnicodeScript_kArabic, UnicodeScript_kArabic, CTLScriptType::CTL_ARABIC },    // 11
        { UnicodeScript_kDevanagari, UnicodeScript_kDevanagari, CTLScriptType::CTL_INDIC },     // 14
        { UnicodeScript_kThai, UnicodeScript_kThai, CTLScriptType::CTL_THAI },      // 24
        { UnicodeScript_kScriptCount, UnicodeScript_kScriptCount,   CTLScriptType::CTL_UNKNOWN }    // 88
    };

    return unicode::getUnicodeScriptType(Text[nPos], typeList, CTLScriptType::CTL_UNKNOWN);
}

// Begin of Script Type is inclusive.
sal_Int32 SAL_CALL
ScriptTypeDetector::beginOfCTLScriptType( const ::rtl::OUString& Text, sal_Int32 nPos ) throw (::com::sun::star::uno::RuntimeException)
{
    if (nPos < 0)
        return 0;
    else if (nPos >= Text.getLength())
        return Text.getLength();
    else {
        sal_Int16 cType = getCTLScriptType(Text, nPos);
        for (nPos--; nPos >= 0; nPos--) {
            if (cType != getCTLScriptType(Text, nPos))
                break;
        }
        return nPos + 1;
    }
}

// End of the Script Type is exclusive, the return value pointing to the begin of next script type
sal_Int32 SAL_CALL
ScriptTypeDetector::endOfCTLScriptType( const ::rtl::OUString& Text, sal_Int32 nPos ) throw (::com::sun::star::uno::RuntimeException)
{
    if (nPos < 0)
        return 0;
    else if (nPos >= Text.getLength())
        return Text.getLength();
    else {
        sal_Int16 cType = getCTLScriptType(Text, nPos);
        sal_Int32 len = Text.getLength();
        for (nPos++; nPos < len; nPos++) {
            if (cType != getCTLScriptType(Text, nPos))
                break;
        }
        return nPos;
    }
}

const sal_Char sDetector[] = "draft.com.sun.star.i18n.ScriptTypeDetector";

rtl::OUString SAL_CALL
ScriptTypeDetector::getImplementationName() throw( ::com::sun::star::uno::RuntimeException )
{
    return ::rtl::OUString::createFromAscii(sDetector);
}

sal_Bool SAL_CALL
ScriptTypeDetector::supportsService(const rtl::OUString& ServiceName) throw( ::com::sun::star::uno::RuntimeException )
{
    return !ServiceName.compareToAscii(sDetector);
}

::com::sun::star::uno::Sequence< rtl::OUString > SAL_CALL
ScriptTypeDetector::getSupportedServiceNames() throw( ::com::sun::star::uno::RuntimeException )
{
    ::com::sun::star::uno::Sequence< ::rtl::OUString > aRet(1);
    aRet[0] = ::rtl::OUString::createFromAscii(sDetector);
    return aRet;
}

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