/*
   Copyright (C) 2003 - 2018 by David White <dave@whitevine.net>
   Copyright (C) 2009 - 2018 by Iris Morelle <shadowm2006@gmail.com>
   Part of the Battle for Wesnoth Project https://www.wesnoth.org/

   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 2 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.

   See the COPYING file for more details.
*/

#include "sound_music_track.hpp"

#include "config.hpp"
#include "filesystem.hpp"
#include "log.hpp"
#include "serialization/string_utils.hpp"
#if !defined(_WIN32) && !defined(__APPLE__)
#include "vorbis/vorbisfile.h"
#endif

static lg::log_domain log_audio("audio");
#define ERR_AUDIO LOG_STREAM(err, log_audio)
#define LOG_AUDIO LOG_STREAM(info, log_audio)

namespace sound {

music_track::music_track() :
	id_(),
	file_path_(),
	ms_before_(0),
	ms_after_(0),
	once_(false),
	append_(false),
	immediate_(false),
	shuffle_(true)
{
}

music_track::music_track(const config& node) :
	id_(node["name"]),
	file_path_(),
	title_(node["title"]),
	ms_before_(node["ms_before"]),
	ms_after_(node["ms_after"]),
	once_(node["play_once"].to_bool()),
	append_(node["append"].to_bool()),
	immediate_(node["immediate"].to_bool()),
	shuffle_(node["shuffle"].to_bool(true))
{
	resolve();
}

music_track::music_track(const std::string& v_name) :
	id_(v_name),
	file_path_(),
	title_(),
	ms_before_(0),
	ms_after_(0),
	once_(false),
	append_(false),
	immediate_(false),
	shuffle_(true)
{
	resolve();
}

void music_track::resolve()
{
	if (id_.empty()) {
		LOG_AUDIO << "empty track filename specified for track identification\n";
		return;
	}

	file_path_ = filesystem::get_binary_file_location("music", id_);

	if (file_path_.empty()) {
		LOG_AUDIO << "could not find track '" << id_ << "' for track identification\n";
		return;
	}


#if !defined(_WIN32) && !defined(__APPLE__)
	if (title_.empty()) {
		FILE* f;
		f = fopen(file_path_.c_str(), "r");
		if (f == nullptr) {
			LOG_AUDIO << "Error opening file '" << file_path_
					<< "' for track identification\n";
			return;
		}

		OggVorbis_File vf;
		if(ov_open(f, &vf, nullptr, 0) < 0) {
			LOG_AUDIO << "track does not appear to be an Ogg file '"
					<< id_ << "', cannot be identified\n";
			ov_clear(&vf);
			return;
		}

		vorbis_comment* comments = ov_comment(&vf, -1);
		char** user_comments = comments->user_comments;

		bool found = false;
		for (int i=0; i< comments->comments; i++) {
			const std::string comment_string(user_comments[i]);
			const std::vector<std::string> comment_list = utils::split(comment_string, '=');

			if (comment_list[0] == "TITLE" || comment_list[0] == "title") {
				title_ = comment_list[1];
				found = true;
			}
		}
		if (!found) {
			LOG_AUDIO << "No title for music track '" << id_ << "'\n";
		}

	ov_clear(&vf);
	}
#endif

	LOG_AUDIO << "resolved music track '" << id_ << "' into '" << file_path_ << "'\n";
}

void music_track::write(config &parent_node, bool append) const
{
	config& m = parent_node.add_child("music");
	m["name"] = id_;
	m["ms_before"] = ms_before_;
	m["ms_after"] = ms_after_;
	if(append) {
		m["append"] = true;
	}
	//default behaviour is to shuffle
	m["shuffle"] = shuffle_;
}

} /* end namespace sound */