/*
 * This file is part of vimix - video live mixer
 *
 * **Copyright** (C) 2020-2021 Bruno Herbelin <bruno.herbelin@gmail.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <https://www.gnu.org/licenses/>.
**/

#include <sstream>
#include <iomanip>
using namespace std;

#include <gst/gl/gl.h>

#include "GstToolkit.h"

string GstToolkit::time_to_string(guint64 t, time_string_mode m)
{
    if (t == GST_CLOCK_TIME_NONE) {
        switch (m) {
        case TIME_STRING_FIXED:
            return "00:00:00.00";
        case TIME_STRING_MINIMAL:
            return "0.0";
        case TIME_STRING_READABLE:
            return "0 second";
        default:
            return "00.00";
        }
    }

    guint ms =  GST_TIME_AS_MSECONDS(t);
    guint s = ms / 1000;
    ostringstream oss;

    // READABLE : long format
    if (m == TIME_STRING_READABLE) {
        int count = 0;
        if (s / 3600) {
            oss << s / 3600 << " h ";
            count++;
        }
        if ((s % 3600) / 60) {
            oss << (s % 3600) / 60 << " min ";
            count++;
        }
        if (count < 2) {
            oss << setw(count > 0 ? 2 : 1) << setfill('0') << (s % 3600) % 60;
            count++;
        }
        if (count < 2 )
            oss << '.'<< setw(1) << setfill('0') << (ms % 1000) / 100;
        oss << " sec";
    }
    // MINIMAL: keep only the 2 higher values (most significant)
    else if (m == TIME_STRING_MINIMAL) {
        int count = 0;
        if (s / 3600) {
            oss << s / 3600 << ':';
            count++;
        }
        if ((s % 3600) / 60) {
            oss << (s % 3600) / 60 << ':';
            count++;
        }
        if (count < 2) {
            oss << setw(count > 0 ? 2 : 1) << setfill('0') << (s % 3600) % 60;
            count++;
        }
        if (count < 2 )
            oss << '.'<< setw(2) << setfill('0') << (ms % 1000) / 10;
    }
    else {
        // TIME_STRING_FIXED : fixed length string (11 chars) HH:mm:ss.ii"
        // TIME_STRING_RIGHT : always show the right part (seconds), not the min or hours if none
        if (m == TIME_STRING_FIXED || (s / 3600) )
            oss << setw(2) << setfill('0') << s / 3600 << ':';
        if (m == TIME_STRING_FIXED || ((s % 3600) / 60) )
            oss << setw(2) << setfill('0') << (s % 3600) / 60 << ':';
        oss << setw(2) << setfill('0') << (s % 3600) % 60 << '.';
        oss << setw(2) << setfill('0') << (ms % 1000) / 10;
    }

    return oss.str();
}


std::string GstToolkit::filename_to_uri(std::string path)
{
    if (path.empty())
        return path;

    // set uri to open
    gchar *uritmp = gst_filename_to_uri(path.c_str(), NULL);
    std::string uri( uritmp );
    g_free(uritmp);
    return uri;
}

list<string> GstToolkit::all_plugins()
{
    list<string> pluginlist;
    GList *l, *g;

    l = gst_registry_get_plugin_list (gst_registry_get ());

    for (g = l; g; g = g->next) {
        GstPlugin *plugin = GST_PLUGIN (g->data);
        pluginlist.push_front( string( gst_plugin_get_name (plugin) ) );
    }

    gst_plugin_list_free (l);

    return pluginlist;
}


list<string> GstToolkit::all_plugin_features(string pluginname)
{
    list<string> featurelist;
    GList *l, *g;

    l = gst_registry_get_feature_list_by_plugin (gst_registry_get (), pluginname.c_str());

    for (g = l; g; g = g->next) {
        GstPluginFeature *feature = GST_PLUGIN_FEATURE (g->data);
        featurelist.push_front( string( gst_plugin_feature_get_name (feature) ) );
    }

    gst_plugin_feature_list_free (l);

    return featurelist;
}

bool GstToolkit::enable_feature (string name, bool enable) {
    GstRegistry *registry = NULL;
    GstElementFactory *factory = NULL;

    registry = gst_registry_get();
    if (!registry) return false;

    factory = gst_element_factory_find (name.c_str());
    if (!factory) return false;

    if (enable) {
        gst_plugin_feature_set_rank (GST_PLUGIN_FEATURE (factory), GST_RANK_PRIMARY + 1);
    }
    else {
        gst_plugin_feature_set_rank (GST_PLUGIN_FEATURE (factory), GST_RANK_NONE);
    }

    gst_registry_add_feature (registry, GST_PLUGIN_FEATURE (factory));
    return true;
}

bool GstToolkit::has_feature (string name)
{
    if (name.empty())
        return false;

    GstRegistry *registry = NULL;
    GstElementFactory *factory = NULL;

    registry = gst_registry_get();
    if (!registry) return false;

    factory = gst_element_factory_find (name.c_str());
    if (!factory) return false;

    return true;
}


string GstToolkit::gst_version()
{
    std::ostringstream oss;
    oss << GST_VERSION_MAJOR << '.' << GST_VERSION_MINOR << '.';
    oss << std::setw(2) << setfill('0') << GST_VERSION_MICRO ;
    if (GST_VERSION_NANO > 0)
        oss << ( (GST_VERSION_NANO < 2 ) ? " - (CVS)" : " - (Prerelease)");

    return oss.str();
}

#if GST_GL_HAVE_PLATFORM_GLX
    // https://gstreamer.freedesktop.org/documentation/nvcodec/index.html?gi-language=c#plugin-nvcodec
    const char *plugins[11] = { "omxmpeg4videodec", "omxmpeg2dec", "omxh264dec", "vdpaumpegdec",
                                "nvh264dec", "nvh265dec", "nvmpeg2videodec",
                                "nvmpeg4videodec", "nvvp8dec", "nvvp9dec", "vaapidecodebin"
                               };
    const int N = 11;
#elif GST_GL_HAVE_PLATFORM_CGL
    const char *plugins[2] = { "vtdec_hw", "vtdechw" };
    const int N = 2;
#else
    const char *plugins[0] = { };
    const int N = 0;
#endif


// see https://developer.ridgerun.com/wiki/index.php?title=GStreamer_modify_the_elements_rank
std::list<std::string> GstToolkit::enable_gpu_decoding_plugins(bool enable)
{
    list<string> plugins_list_;

    static GstRegistry* plugins_register = nullptr;
    if ( plugins_register == nullptr )
        plugins_register = gst_registry_get();

    static bool enabled_ = false;
    if (enabled_ != enable) {
        enabled_ = enable;
        for (int i = 0; i < N; i++) {
            GstPluginFeature* feature = gst_registry_lookup_feature(plugins_register, plugins[i]);
            if(feature != NULL) {
                plugins_list_.push_front( string( plugins[i] ) );
                gst_plugin_feature_set_rank(feature, enable ? GST_RANK_PRIMARY + 1 : GST_RANK_MARGINAL);
                gst_object_unref(feature);
            }
        }
    }

    return plugins_list_;
}


std::string GstToolkit::used_gpu_decoding_plugins(GstElement *gstbin)
{
    std::string found = "";

    GstIterator* it  = gst_bin_iterate_recurse(GST_BIN(gstbin));
    GValue value = G_VALUE_INIT;
    for(GstIteratorResult r = gst_iterator_next(it, &value); r != GST_ITERATOR_DONE; r = gst_iterator_next(it, &value))
    {
        if ( r == GST_ITERATOR_OK )
        {
            GstElement *e = static_cast<GstElement*>(g_value_peek_pointer(&value));
            if (e) {
                gchar *name = gst_element_get_name(e);
//                 g_print(" - %s", name);
                std::string e_name(name);
                g_free(name);
                for (int i = 0; i < N; i++) {
                    if (e_name.find(plugins[i]) != std::string::npos) {
                        found = plugins[i];
                        break;
                    }
                }
            }
        }
        g_value_unset(&value);
    }
    gst_iterator_free(it);

    return found;
}



std::string GstToolkit::used_decoding_plugins(GstElement *gstbin)
{
    std::string found = "";

    GstIterator* it  = gst_bin_iterate_recurse(GST_BIN(gstbin));
    GValue value = G_VALUE_INIT;
    for(GstIteratorResult r = gst_iterator_next(it, &value); r != GST_ITERATOR_DONE; r = gst_iterator_next(it, &value))
    {
        if ( r == GST_ITERATOR_OK )
        {
            GstElement *e = static_cast<GstElement*>(g_value_peek_pointer(&value));
            if (e) {
                gchar *name = gst_element_get_name(e);
                found += std::string(name) + ", ";
            }
        }
        g_value_unset(&value);
    }
    gst_iterator_free(it);

    return found;
}