/*
  ==============================================================================

   This file is part of the JUCE framework.
   Copyright (c) Raw Material Software Limited

   JUCE is an open source framework subject to commercial or open source
   licensing.

   By downloading, installing, or using the JUCE framework, or combining the
   JUCE framework with any other source code, object code, content or any other
   copyrightable work, you agree to the terms of the JUCE End User Licence
   Agreement, and all incorporated terms including the JUCE Privacy Policy and
   the JUCE Website Terms of Service, as applicable, which will bind you. If you
   do not agree to the terms of these agreements, we will not license the JUCE
   framework to you, and you must discontinue the installation or download
   process and cease use of the JUCE framework.

   JUCE End User Licence Agreement: https://juce.com/legal/juce-8-licence/
   JUCE Privacy Policy: https://juce.com/juce-privacy-policy
   JUCE Website Terms of Service: https://juce.com/juce-website-terms-of-service/

   Or:

   You may also use this code under the terms of the AGPLv3:
   https://www.gnu.org/licenses/agpl-3.0.en.html

   THE JUCE FRAMEWORK IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL
   WARRANTIES, WHETHER EXPRESSED OR IMPLIED, INCLUDING WARRANTY OF
   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE DISCLAIMED.

  ==============================================================================
*/

namespace juce
{

#if JUCE_DEBUG

//==============================================================================
struct DanglingStreamChecker
{
    DanglingStreamChecker() = default;

    ~DanglingStreamChecker()
    {
        /*
            It's always a bad idea to leak any object, but if you're leaking output
            streams, then there's a good chance that you're failing to flush a file
            to disk properly, which could result in corrupted data and other similar
            nastiness.
        */
        jassert (activeStreams.size() == 0);

        // We need to flag when this helper struct has been destroyed to prevent some
        // nasty order-of-static-destruction issues
        hasBeenDestroyed = true;
    }

    Array<void*, CriticalSection> activeStreams;

    static bool hasBeenDestroyed;
};

bool DanglingStreamChecker::hasBeenDestroyed = false;
static DanglingStreamChecker danglingStreamChecker;

#endif

//==============================================================================
OutputStream::OutputStream()
    : newLineString (NewLine::getDefault())
{
   #if JUCE_DEBUG
    if (! DanglingStreamChecker::hasBeenDestroyed)
        danglingStreamChecker.activeStreams.add (this);
   #endif
}

OutputStream::~OutputStream()
{
   #if JUCE_DEBUG
    if (! DanglingStreamChecker::hasBeenDestroyed)
        danglingStreamChecker.activeStreams.removeFirstMatchingValue (this);
   #endif
}

//==============================================================================
bool OutputStream::writeBool (bool b)
{
    return writeByte (b ? (char) 1
                        : (char) 0);
}

bool OutputStream::writeByte (char byte)
{
    return write (&byte, 1);
}

bool OutputStream::writeRepeatedByte (uint8 byte, size_t numTimesToRepeat)
{
    for (size_t i = 0; i < numTimesToRepeat; ++i)
        if (! writeByte ((char) byte))
            return false;

    return true;
}

bool OutputStream::writeShort (short value)
{
    auto v = ByteOrder::swapIfBigEndian ((uint16) value);
    return write (&v, 2);
}

bool OutputStream::writeShortBigEndian (short value)
{
    auto v = ByteOrder::swapIfLittleEndian ((uint16) value);
    return write (&v, 2);
}

bool OutputStream::writeInt (int value)
{
    auto v = ByteOrder::swapIfBigEndian ((uint32) value);
    return write (&v, 4);
}

bool OutputStream::writeIntBigEndian (int value)
{
    auto v = ByteOrder::swapIfLittleEndian ((uint32) value);
    return write (&v, 4);
}

bool OutputStream::writeCompressedInt (int value)
{
    auto un = (value < 0) ? (unsigned int) -value
                          : (unsigned int) value;

    uint8 data[5];
    int num = 0;

    while (un > 0)
    {
        data[++num] = (uint8) un;
        un >>= 8;
    }

    data[0] = (uint8) num;

    if (value < 0)
        data[0] |= 0x80;

    return write (data, (size_t) num + 1);
}

bool OutputStream::writeInt64 (int64 value)
{
    auto v = ByteOrder::swapIfBigEndian ((uint64) value);
    return write (&v, 8);
}

bool OutputStream::writeInt64BigEndian (int64 value)
{
    auto v = ByteOrder::swapIfLittleEndian ((uint64) value);
    return write (&v, 8);
}

bool OutputStream::writeFloat (float value)
{
    union { int asInt; float asFloat; } n;
    n.asFloat = value;
    return writeInt (n.asInt);
}

bool OutputStream::writeFloatBigEndian (float value)
{
    union { int asInt; float asFloat; } n;
    n.asFloat = value;
    return writeIntBigEndian (n.asInt);
}

bool OutputStream::writeDouble (double value)
{
    union { int64 asInt; double asDouble; } n;
    n.asDouble = value;
    return writeInt64 (n.asInt);
}

bool OutputStream::writeDoubleBigEndian (double value)
{
    union { int64 asInt; double asDouble; } n;
    n.asDouble = value;
    return writeInt64BigEndian (n.asInt);
}

bool OutputStream::writeString (const String& text)
{
    auto numBytes = text.getNumBytesAsUTF8() + 1;

   #if (JUCE_STRING_UTF_TYPE == 8)
    return write (text.toRawUTF8(), numBytes);
   #else
    // (This avoids using toUTF8() to prevent the memory bloat that it would leave behind
    // if lots of large, persistent strings were to be written to streams).
    HeapBlock<char> temp (numBytes);
    text.copyToUTF8 (temp, numBytes);
    return write (temp, numBytes);
   #endif
}

bool OutputStream::writeText (const String& text, bool asUTF16, bool writeUTF16ByteOrderMark, const char* lf)
{
    bool replaceLineFeedWithUnix    = lf != nullptr && lf[0] == '\n' && lf[1] == 0;
    bool replaceLineFeedWithWindows = lf != nullptr && lf[0] == '\r' && lf[1] == '\n' && lf[2] == 0;

    // The line-feed passed in must be either nullptr, or "\n" or "\r\n"
    jassert (lf == nullptr || replaceLineFeedWithWindows || replaceLineFeedWithUnix);

    if (asUTF16)
    {
        if (writeUTF16ByteOrderMark)
            write ("\x0ff\x0fe", 2);

        auto src = text.getCharPointer();
        bool lastCharWasReturn = false;

        for (;;)
        {
            auto c = src.getAndAdvance();

            if (c == 0)
                break;

            if (replaceLineFeedWithWindows)
            {
                if (c == '\n' && ! lastCharWasReturn)
                    writeShort ((short) '\r');

                lastCharWasReturn = (c == L'\r');
            }
            else if (replaceLineFeedWithUnix && c == '\r')
            {
                continue;
            }

            CharPointer_UTF16::CharType buffer[2]{};
            CharPointer_UTF16 begin { buffer };
            auto end = begin;
            end.write (c);

            for (const auto unit : makeRange (begin.getAddress(), end.getAddress()))
                if (! writeShort ((short) unit))
                    return false;
        }
    }
    else
    {
        const char* src = text.toRawUTF8();

        if (replaceLineFeedWithWindows)
        {
            for (auto t = src;;)
            {
                if (*t == '\n')
                {
                    if (t > src)
                        if (! write (src, (size_t) (t - src)))
                            return false;

                    if (! write ("\r\n", 2))
                        return false;

                    src = t + 1;
                }
                else if (*t == '\r')
                {
                    if (t[1] == '\n')
                        ++t;
                }
                else if (*t == 0)
                {
                    if (t > src)
                        if (! write (src, (size_t) (t - src)))
                            return false;

                    break;
                }

                ++t;
            }
        }
        else if (replaceLineFeedWithUnix)
        {
            for (;;)
            {
                auto c = *src++;

                if (c == 0)
                    break;

                if (c != '\r')
                    if (! writeByte (c))
                        return false;
            }
        }
        else
        {
            return write (src, text.getNumBytesAsUTF8());
        }
    }

    return true;
}

int64 OutputStream::writeFromInputStream (InputStream& source, int64 numBytesToWrite)
{
    if (numBytesToWrite < 0)
        numBytesToWrite = std::numeric_limits<int64>::max();

    int64 numWritten = 0;

    while (numBytesToWrite > 0)
    {
        char buffer[8192];
        auto num = source.read (buffer, (int) jmin (numBytesToWrite, (int64) sizeof (buffer)));

        if (num <= 0)
            break;

        write (buffer, (size_t) num);

        numBytesToWrite -= num;
        numWritten += num;
    }

    return numWritten;
}

//==============================================================================
void OutputStream::setNewLineString (const String& newLineStringToUse)
{
    newLineString = newLineStringToUse;
}

//==============================================================================
template <typename IntegerType>
static void writeIntToStream (OutputStream& stream, IntegerType number)
{
    char buffer[NumberToStringConverters::charsNeededForInt];
    char* end = buffer + numElementsInArray (buffer);
    const char* start = NumberToStringConverters::numberToString (end, number);
    stream.write (start, (size_t) (end - start - 1));
}

JUCE_API OutputStream& JUCE_CALLTYPE operator<< (OutputStream& stream, const int number)
{
    writeIntToStream (stream, number);
    return stream;
}

JUCE_API OutputStream& JUCE_CALLTYPE operator<< (OutputStream& stream, const int64 number)
{
    writeIntToStream (stream, number);
    return stream;
}

JUCE_API OutputStream& JUCE_CALLTYPE operator<< (OutputStream& stream, const double number)
{
    return stream << String (number);
}

JUCE_API OutputStream& JUCE_CALLTYPE operator<< (OutputStream& stream, const char character)
{
    stream.writeByte (character);
    return stream;
}

JUCE_API OutputStream& JUCE_CALLTYPE operator<< (OutputStream& stream, const char* const text)
{
    stream.write (text, strlen (text));
    return stream;
}

JUCE_API OutputStream& JUCE_CALLTYPE operator<< (OutputStream& stream, const MemoryBlock& data)
{
    if (! data.isEmpty())
        stream.write (data.getData(), data.getSize());

    return stream;
}

JUCE_API OutputStream& JUCE_CALLTYPE operator<< (OutputStream& stream, const File& fileToRead)
{
    FileInputStream in (fileToRead);

    if (in.openedOk())
        return stream << in;

    return stream;
}

JUCE_API OutputStream& JUCE_CALLTYPE operator<< (OutputStream& stream, InputStream& streamToRead)
{
    stream.writeFromInputStream (streamToRead, -1);
    return stream;
}

JUCE_API OutputStream& JUCE_CALLTYPE operator<< (OutputStream& stream, const NewLine&)
{
    return stream << stream.getNewLineString();
}

#if JUCE_UNIT_TESTS

class OutputStreamUTF16Test final : public UnitTest
{
public:
    OutputStreamUTF16Test() : UnitTest { "OutputStream::writeText UTF16", UnitTestCategories::streams } {}

    void runTest() final
    {
        beginTest ("writeText UTF16 - Can support full unicode codepoints");
        {
            static constexpr juce_wchar stringA[] { 0x1F600, 0x00 }; // Grinning face emoji
            static constexpr juce_wchar stringB[] { 0xA, 0xB, 0xC, 0x0 }; // ASCII
            static constexpr juce_wchar stringC[] { 0xAAAA, 0xBBBB, 0xCCCC, 0x0 }; // two-byte characters

            CharPointer_UTF32 pointers[] { CharPointer_UTF32 (stringA),
                                           CharPointer_UTF32 (stringB),
                                           CharPointer_UTF32 (stringC) };

            for (auto originalPtr : pointers)
            {
                MemoryOutputStream stream;
                stream.writeText (originalPtr, true, false, "\n");

                expect (stream.getDataSize() != 0);

                CharPointer_UTF16 writtenPtr { reinterpret_cast<const CharPointer_UTF16::CharType*> (stream.getData()) };

                for (; *originalPtr != 0; ++originalPtr, ++writtenPtr)
                    expect (*originalPtr == *writtenPtr);
            }
        }
    }
};

static OutputStreamUTF16Test outputStreamUTF16Test;

#endif

} // namespace juce
