// Copyright 2016 Etix Labs
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include <tasks/thumbnail.h>

namespace etix {
namespace cameradar {

std::string
remove_trailing_backslash(std::string s) {
    while (s.back() == '/') { s.pop_back(); }
    return s;
}

// Tranforms the path into a path for the thumbnail
// Example :
// rtsp://username:password@172.16.100.13/live.sdp
// will become /storage/path/172.16.100.13/1345425533.jpg
std::string
thumbnail::build_output_file_path(const std::string& path) const {
    auto ss = std::stringstream{};

    ss << remove_trailing_backslash(this->conf.thumbnail_storage_path);
    ss << "/";
    ss << path;
    ss << "/";
    ss << std::to_string(std::chrono::system_clock::to_time_t(std::chrono::system_clock::now()));
    ss << ".jpg";

    return ss.str();
}

bool
thumbnail::generate_thumbnail(const stream_model& stream) const {
    LOG_INFO_("Generating thumbnail for " + stream.address, "thumbnail_generation");
    if (signal_handler::instance().should_stop() != etix::cameradar::stop_priority::running)
        return false;
    std::string ffmpeg_cmd =
        "mkdir -p %s ; "
        "timeout 20 "
        "ffmpeg "
        "-rtsp_transport tcp "
        "-y "
        "-nostdin "
        "-loglevel quiet " // no logs
        "-i '%s' "         // input
        "-vcodec mjpeg "   // jpeg codec
        "-vframes 1 "      // only take one frame
        "-an "             // disable audio
        "-f image2 "       // force image
        "-s 240x180 "      // force size
        "'%s'";
    std::string fullpath = make_path(stream);
    std::string output = build_output_file_path(stream.address);
    ffmpeg_cmd = tool::fmt(ffmpeg_cmd.c_str(),
                           output.substr(0, output.find_last_of("/")).c_str(),
                           fullpath.c_str(),
                           output.c_str());
    if (!launch_command(ffmpeg_cmd)) {
        LOG_WARN_("The following command [" + ffmpeg_cmd +
                      "] didn't work. That can either mean that the stream is "
                      "not valid or "
                      "that there is a problem with the camera.",
                  "thumbnail_generation");
        return false;
    } else {
        LOG_DEBUG_("Generated thumbnail : " + ffmpeg_cmd, "thumbnail_generation");
        try {
            stream_model result{ stream.address,    stream.port,      stream.username,
                                 stream.password,   stream.route,     stream.service_name,
                                 stream.product,    stream.protocol,  stream.state,
                                 stream.path_found, stream.ids_found, output };
            (*cache)->update_stream(result);

        } catch (const std::exception& e) { LOG_DEBUG_(e.what(), "thumbnail_generation"); }
    }
    return true;
}

// Gets all the discovered streams with good routes and logs
// And launches an ffmpeg command to generate a thumbnail
// In order to check for the stream validity
bool
thumbnail::run() const {
    std::vector<std::future<bool>> futures;
    std::vector<stream_model> streams = (*cache)->get_valid_streams();

    LOG_INFO_("Started thumbnail generation, it may take a while", "thumbnail");
    if (not streams.size()) {
        LOG_WARN_("There were no valid streams to generate thumbnails from. Cameradar will stop.",
                  "thumbnail_generation");
        return false;
    }
    int done = 0;
    for (const auto& stream : streams) {
        futures.push_back(
            std::async(std::launch::async, &thumbnail::generate_thumbnail, this, stream));
    }
    for (auto& fit : futures) {
        if (fit.get()) { ++done; }
    }
    return true;
}
}
}