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#include <sstream>

#include <pdal/StageExtensions.hpp>
#include <pdal/util/FileUtils.hpp>

namespace pdal
{

namespace
{

// NOTE: Only extensions for dynamic stages go here.  Static stage extensions
//  are defined in the stage files themselves.

using Extensions = std::map<std::string, StringList>;

static const Extensions readerExtensions =
{
  {"readers.icebridge", { "icebridge", "h5" } },
  { "readers.matlab", { "mat" } },
  { "readers.nitf", { "nitf", "nsf", "ntf" } },
  { "readers.pcd", { "pcd" } },
  { "readers.rdb", { "rdbx" } },
  { "readers.mrsid", { "sid" } },
  { "readers.rxp", { "rxp" } },
  { "readers.fbx", { "fbx" } },
  { "readers.slpk", { "slpk" } },
  { "readers.i3s", { "i3s" } },
  { "readers.obj", { "obj" } },
  { "readers.e57", { "e57" } }
};

static const Extensions writerExtensions =
{
  { "writers.matlab", { "mat" } },
  { "writers.nitf", { "nitf", "nsf", "ntf" } },
  { "writers.pcd", { "pcd" } },
  { "writers.e57", { "e57" } },
  { "writers.fbx", { "fbx" } }
};

} // unnamed namespace

StageExtensions::StageExtensions(LogPtr log) : m_log(log)
{}


void StageExtensions::load()
{
    static bool loaded(false);

    if (loaded)
        return;
    loaded = true;

    std::lock_guard<std::mutex> lock(m_mutex);
    for (auto& p : readerExtensions)
    {
        const std::string& stage = p.first;
        for (auto& ext : p.second)
            m_readers[ext] = stage;
    }
    for (auto& p : writerExtensions)
    {
        const std::string& stage = p.first;
        for (auto& ext : p.second)
            m_writers[ext] = stage;
    }
}

PDAL_DLL void StageExtensions::set(const std::string& stage,
    const StringList& exts)
{
    std::lock_guard<std::mutex> lock(m_mutex);
    if (Utils::startsWith(stage, "readers."))
        for (const std::string& ext : exts)
            m_readers[ext] = stage;
    else if (Utils::startsWith(stage, "writers."))
        for (const std::string& ext : exts)
            m_writers[ext] = stage;
}

// Get the default reader associated with an extension.  Extensions
// are specified without the leading '.'
std::string StageExtensions::defaultReader(const std::string& extension)
{
    load();
    std::lock_guard<std::mutex> lock(m_mutex);
    return (m_readers[extension]);
}


// Get the default writer associated with an extension.  Extensions
// are specified without the leading '.'
std::string StageExtensions::defaultWriter(const std::string& extension)
{
    load();
    std::lock_guard<std::mutex> lock(m_mutex);
    return (m_writers[extension]);
}


StringList StageExtensions::extensions(const std::string& stage)
{
    StringList exts;

    std::lock_guard<std::mutex> lock(m_mutex);

    if (Utils::startsWith(stage, "readers."))
    {
        for (auto& entry : m_readers)
            if (entry.second == stage)
                exts.push_back(entry.first);
    }
    else if (Utils::startsWith(stage, "writers."))
    {
        for (auto& entry : m_writers)
            if (entry.second == stage)
                exts.push_back(entry.first);
    }
    return exts;
}

} // namespace pdal
