/*
 * Copyright (C) 2004, 2006 Apple Computer, Inc.  All rights reserved.
 * Copyright (C) 2006 Alexey Proskuryakov (ap@nypop.com)
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 */

#include "config.h"
#include "c_utility.h"

#include "NP_jsobject.h"
#include "c_instance.h" 
#include "npruntime_impl.h"
#include "npruntime_priv.h"
#include "runtime_object.h"
#include "runtime_root.h"
#include "Platform.h"
#if USE(ICU_UNICODE)
#include <unicode/ucnv.h>
#endif

namespace KJS { namespace Bindings {

// Requires free() of returned UTF16Chars.
void convertNPStringToUTF16(const NPString *string, NPUTF16 **UTF16Chars, unsigned int *UTF16Length)
{
    convertUTF8ToUTF16(string->UTF8Characters, string->UTF8Length, UTF16Chars, UTF16Length);
}

// Requires free() of returned UTF16Chars.
void convertUTF8ToUTF16(const NPUTF8 *UTF8Chars, int UTF8Length, NPUTF16 **UTF16Chars, unsigned int *UTF16Length)
{
#if USE(ICU_UNICODE)
    assert(UTF8Chars || UTF8Length == 0);
    assert(UTF16Chars);
    
    if (UTF8Length == -1)
        UTF8Length = static_cast<int>(strlen(UTF8Chars));
        
    // UTF16Length maximum length is the length of the UTF8 string, plus one to include terminator
    // Without the plus one, it will convert ok, but a warning is generated from the converter as
    // there is not enough room for a terminating character.
    *UTF16Length = UTF8Length + 1; 
        
    *UTF16Chars = 0;
    UErrorCode status = U_ZERO_ERROR;
    UConverter* conv = ucnv_open("utf8", &status);
    if (U_SUCCESS(status)) { 
        *UTF16Chars = (NPUTF16 *)malloc(sizeof(NPUTF16) * (*UTF16Length));
        ucnv_setToUCallBack(conv, UCNV_TO_U_CALLBACK_STOP, 0, 0, 0, &status);
        *UTF16Length = ucnv_toUChars(conv, (::UChar*)*UTF16Chars, *UTF16Length, UTF8Chars, UTF8Length, &status); 
        ucnv_close(conv);
    } 
    
    // Check to see if the conversion was successful
    // Some plugins return invalid UTF-8 in NPVariantType_String, see <http://bugs.webkit.org/show_bug.cgi?id=5163>
    // There is no "bad data" for latin1. It is unlikely that the plugin was really sending text in this encoding,
    // but it should have used UTF-8, and now we are simply avoiding a crash.
    if (!U_SUCCESS(status)) {
        *UTF16Length = UTF8Length;
        
        if (!*UTF16Chars)   // If the memory wasn't allocated, allocate it.
            *UTF16Chars = (NPUTF16 *)malloc(sizeof(NPUTF16) * (*UTF16Length));
 
        for (unsigned i = 0; i < *UTF16Length; i++)
            (*UTF16Chars)[i] = UTF8Chars[i] & 0xFF;
    }
#else
    assert(!"Implement me!");    
#endif
}

// Variant value must be released with NPReleaseVariantValue()
void convertValueToNPVariant(ExecState *exec, JSValue *value, NPVariant *result)
{
    JSLock lock;
    
    JSType type = value->type();
    
    VOID_TO_NPVARIANT(*result);

    if (type == StringType) {
        UString ustring = value->toString(exec);
        CString cstring = ustring.UTF8String();
        NPString string = { (const NPUTF8 *)cstring.c_str(), static_cast<uint32_t>(cstring.size()) };
        NPN_InitializeVariantWithStringCopy(result, &string);
    } else if (type == NumberType) {
        DOUBLE_TO_NPVARIANT(value->toNumber(exec), *result);
    } else if (type == BooleanType) {
        BOOLEAN_TO_NPVARIANT(value->toBoolean(exec), *result);
    } else if (type == UnspecifiedType) {
        VOID_TO_NPVARIANT(*result);
    } else if (type == NullType) {
        NULL_TO_NPVARIANT(*result);
    } else if (type == ObjectType) {
        JSObject* object = static_cast<JSObject*>(value);
        if (object->classInfo() == &RuntimeObjectImp::info) {
            RuntimeObjectImp* imp = static_cast<RuntimeObjectImp *>(value);
            CInstance* instance = static_cast<CInstance*>(imp->getInternalInstance());
            if (instance) {
                NPObject* obj = instance->getObject();
                _NPN_RetainObject(obj);
                OBJECT_TO_NPVARIANT(obj, *result);
            }
        } else {
            Interpreter* originInterpreter = exec->dynamicInterpreter();
            RootObject* originRootObject = findRootObject(originInterpreter);

            Interpreter* interpreter = 0;
            if (originInterpreter->isGlobalObject(value)) {
                interpreter = originInterpreter->interpreterForGlobalObject(value);
            }

            if (!interpreter)
                interpreter = originInterpreter;

            RootObject* rootObject = findRootObject(interpreter);
            if (rootObject) {
                NPObject* npObject = _NPN_CreateScriptObject(0, object, originRootObject, rootObject);
                OBJECT_TO_NPVARIANT(npObject, *result);
            }
        }
    }
}

JSValue *convertNPVariantToValue(ExecState*, const NPVariant* variant, RootObject* rootObject)
{
    JSLock lock;
    
    NPVariantType type = variant->type;

    if (type == NPVariantType_Bool)
        return jsBoolean(NPVARIANT_TO_BOOLEAN(*variant));
    if (type == NPVariantType_Null)
        return jsNull();
    if (type == NPVariantType_Void)
        return jsUndefined();
    if (type == NPVariantType_Int32)
        return jsNumber(NPVARIANT_TO_INT32(*variant));
    if (type == NPVariantType_Double)
        return jsNumber(NPVARIANT_TO_DOUBLE(*variant));
    if (type == NPVariantType_String) {
        NPUTF16 *stringValue;
        unsigned int UTF16Length;
        convertNPStringToUTF16(&variant->value.stringValue, &stringValue, &UTF16Length); // requires free() of returned memory
        UString resultString((const UChar *)stringValue,UTF16Length);
        free(stringValue);
        return jsString(resultString);
    }
    if (type == NPVariantType_Object) {
        NPObject *obj = variant->value.objectValue;
        
        if (obj->_class == NPScriptObjectClass)
            // Get JSObject from NP_JavaScriptObject.
            return ((JavaScriptObject *)obj)->imp;

        // Wrap NPObject in a CInstance.
        return Instance::createRuntimeObject(Instance::CLanguage, obj, rootObject);
    }
    
    return jsUndefined();
}

Identifier identifierFromNPIdentifier(const NPUTF8* name)
{
    NPUTF16 *methodName;
    unsigned UTF16Length;
    convertUTF8ToUTF16(name, -1, &methodName, &UTF16Length); // requires free() of returned memory.
    Identifier identifier((const KJS::UChar*)methodName, UTF16Length);
    free(methodName);
    return identifier;
}

} }