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

   This file is part of the JUCE library.
   Copyright (c) 2022 - Raw Material Software Limited

   JUCE is an open source library subject to commercial or open-source
   licensing.

   By using JUCE, you agree to the terms of both the JUCE 7 End-User License
   Agreement and JUCE Privacy Policy.

   End User License Agreement: www.juce.com/juce-7-licence
   Privacy Policy: www.juce.com/juce-privacy-policy

   Or: You may also use this code under the terms of the GPL v3 (see
   www.gnu.org/licenses).

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

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

namespace juce::build_tools
{

    static const char* resourceFileIdentifierString = "JUCER_BINARY_RESOURCE";

    //==============================================================================
    void ResourceFile::setClassName (const String& name)
    {
        className = name;
    }

    void ResourceFile::addFile (const File& file)
    {
        files.add (file);

        auto variableNameRoot = makeBinaryDataIdentifierName (file);
        auto variableName = variableNameRoot;

        int suffix = 2;

        while (variableNames.contains (variableName))
            variableName = variableNameRoot + String (suffix++);

        variableNames.add (variableName);
    }

    String ResourceFile::getDataVariableFor (const File& file) const
    {
        const auto index = files.indexOf (file);
        jassert (index >= 0);
        return variableNames[index];
    }

    String ResourceFile::getSizeVariableFor (const File& file) const
    {
        return getDataVariableFor (file) + "Size";
    }

    int64 ResourceFile::getTotalDataSize() const
    {
        return std::accumulate (files.begin(),
                                files.end(),
                                int64 { 0 },
                                [] (int64 acc, const File& f) { return acc + f.getSize(); });
    }

    static void writeComment (MemoryOutputStream& mo)
    {
        mo << newLine << newLine
           << "   This is an auto-generated file: Any edits you make may be overwritten!" << newLine
           << newLine
           << "*/" << newLine
           << newLine;
    }

    Result ResourceFile::writeHeader (MemoryOutputStream& header)
    {
        header << "/* =========================================================================================";
        writeComment (header);
        header << "#pragma once" << newLine
               << newLine
               << "namespace " << className << newLine
               << "{" << newLine;

        for (int i = 0; i < files.size(); ++i)
        {
            auto& file = files.getReference (i);

            if (! file.existsAsFile())
                return Result::fail ("Can't open resource file: " + file.getFullPathName());

            auto dataSize = file.getSize();

            auto variableName = variableNames[i];

            FileInputStream fileStream (file);

            if (fileStream.openedOk())
            {
                header << "    extern const char*   " << variableName << ";" << newLine;
                header << "    const int            " << variableName << "Size = " << (int) dataSize << ";" << newLine << newLine;
            }
        }

        header << "    // Number of elements in the namedResourceList and originalFileNames arrays."                             << newLine
               << "    const int namedResourceListSize = " << files.size() <<  ";"                                               << newLine
               << newLine
               << "    // Points to the start of a list of resource names."                                                      << newLine
               << "    extern const char* namedResourceList[];"                                                                  << newLine
               << newLine
               << "    // Points to the start of a list of resource filenames."                                                  << newLine
               << "    extern const char* originalFilenames[];"                                                                  << newLine
               << newLine
               << "    // If you provide the name of one of the binary resource variables above, this function will"             << newLine
               << "    // return the corresponding data and its size (or a null pointer if the name isn't found)."               << newLine
               << "    const char* getNamedResource (const char* resourceNameUTF8, int& dataSizeInBytes);"                       << newLine
               << newLine
               << "    // If you provide the name of one of the binary resource variables above, this function will"             << newLine
               << "    // return the corresponding original, non-mangled filename (or a null pointer if the name isn't found)."  << newLine
               << "    const char* getNamedResourceOriginalFilename (const char* resourceNameUTF8);"                             << newLine
               << "}" << newLine;

        return Result::ok();
    }

    Result ResourceFile::writeCpp (MemoryOutputStream& cpp, const File& headerFile, int& i, const int maxFileSize)
    {
        bool isFirstFile = (i == 0);

        cpp << "/* ==================================== " << resourceFileIdentifierString << " ====================================";
        writeComment (cpp);
        cpp << "#include <cstring>" << newLine
            << newLine
            << "namespace " << className << newLine
            << "{" << newLine;

        while (i < files.size())
        {
            auto& file = files.getReference (i);
            auto variableName = variableNames[i];

            FileInputStream fileStream (file);

            if (fileStream.openedOk())
            {
                auto tempVariable = "temp_binary_data_" + String (i);

                cpp  << newLine << "//================== " << file.getFileName() << " ==================" << newLine
                     << "static const unsigned char " << tempVariable << "[] =" << newLine;

                {
                    MemoryBlock data;
                    fileStream.readIntoMemoryBlock (data);
                    writeDataAsCppLiteral (data, cpp, true, true);
                }

                cpp << newLine << newLine
                    << "const char* " << variableName << " = (const char*) " << tempVariable << ";" << newLine;
            }

            ++i;

            if (cpp.getPosition() > maxFileSize)
                break;
        }

        if (isFirstFile)
        {
            if (i < files.size())
            {
                cpp << newLine
                    << "}" << newLine
                    << newLine
                    << "#include \"" << headerFile.getFileName() << "\"" << newLine
                    << newLine
                    << "namespace " << className << newLine
                    << "{";
            }

            cpp << newLine
                << newLine
                << "const char* getNamedResource (const char* resourceNameUTF8, int& numBytes);" << newLine
                << "const char* getNamedResource (const char* resourceNameUTF8, int& numBytes)"  << newLine
                << "{" << newLine;

            StringArray returnCodes;
            for (auto& file : files)
            {
                auto dataSize = file.getSize();
                returnCodes.add ("numBytes = " + String (dataSize) + "; return " + variableNames[files.indexOf (file)] + ";");
            }

            createStringMatcher (cpp, "resourceNameUTF8", variableNames, returnCodes, 4);

            cpp << "    numBytes = 0;" << newLine
                << "    return nullptr;" << newLine
                << "}" << newLine
                << newLine;

            cpp << "const char* namedResourceList[] =" << newLine
                << "{" << newLine;

            for (int j = 0; j < files.size(); ++j)
                cpp << "    " << variableNames[j].quoted() << (j < files.size() - 1 ? "," : "") << newLine;

            cpp << "};" << newLine << newLine;

            cpp << "const char* originalFilenames[] =" << newLine
                << "{" << newLine;

            for (auto& f : files)
                cpp << "    " << f.getFileName().quoted() << (files.indexOf (f) < files.size() - 1 ? "," : "") << newLine;

            cpp << "};" << newLine << newLine;

            cpp << "const char* getNamedResourceOriginalFilename (const char* resourceNameUTF8);"                        << newLine
                << "const char* getNamedResourceOriginalFilename (const char* resourceNameUTF8)"                         << newLine
                << "{"                                                                                                   << newLine
                << "    for (unsigned int i = 0; i < (sizeof (namedResourceList) / sizeof (namedResourceList[0])); ++i)" << newLine
                << "        if (strcmp (namedResourceList[i], resourceNameUTF8) == 0)"                                   << newLine
                << "            return originalFilenames[i];"                                                            << newLine
                <<                                                                                                          newLine
                << "    return nullptr;"                                                                                 << newLine
                << "}"                                                                                                   << newLine
                <<                                                                                                          newLine;
        }

        cpp << "}" << newLine;

        return Result::ok();
    }

    ResourceFile::WriteResult ResourceFile::write (int maxFileSize,
                                                   String projectLineFeed,
                                                   File headerFile,
                                                   std::function<File (int)> getCppFile)
    {
        Array<File> filesCreated;

        {
            MemoryOutputStream mo;
            mo.setNewLineString (projectLineFeed);

            auto r = writeHeader (mo);

            if (r.failed())
                return { r, {} };

            if (! overwriteFileWithNewDataIfDifferent (headerFile, mo))
                return { Result::fail ("Can't write to file: " + headerFile.getFullPathName()), {} };

            filesCreated.add (headerFile);
        }

        int i = 0;
        int fileIndex = 0;

        for (;;)
        {
            auto cpp = getCppFile (fileIndex);

            MemoryOutputStream mo;
            mo.setNewLineString (projectLineFeed);

            auto r = writeCpp (mo, headerFile, i, maxFileSize);

            if (r.failed())
                return { r, std::move (filesCreated) };

            if (! overwriteFileWithNewDataIfDifferent (cpp, mo))
                return { Result::fail ("Can't write to file: " + cpp.getFullPathName()), std::move (filesCreated) };

            filesCreated.add (cpp);
            ++fileIndex;

            if (i >= files.size())
                break;
        }

        return { Result::ok(), std::move (filesCreated) };
    }

} // namespace juce::build_tools
