/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2015 Microsoft Corporation
 * 
 * -=- Robust Distributed System Nucleus (rDSN) -=- 
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

/*
 * Description:
 *     What is this file about?
 *
 * Revision history:
 *     xxxx-xx-xx, author, first version
 *     xxxx-xx-xx, author, fix bug about xxx
 */

#pragma once

# include <dsn/tool_api.h>
# include <unordered_set>
# include <thread>
# include <mutex>
# include <condition_variable>

namespace dsn {
    namespace tools {
        typedef struct __buffer_info__
        {
            char*    buffer;
            int      buffer_size;
        } buffer_info;

        class hpc_logger : public logging_provider
        {
        public:
            hpc_logger(const char* log_dir);
            virtual ~hpc_logger(void);

            virtual void dsn_logv(const char *file,
                const char *function,
                const int line,
                dsn_log_level_t log_level,
                const char* title,
                const char *fmt,
                va_list args
                );

            virtual void flush();

        private:
            void log_thread();
            
            void flush_all_buffers_at_exit();
            void buffer_push(char* buffer, int size);
            //print logs in log list
            void write_buffer_list(std::list<buffer_info>& llist);
            void create_log_file();

        private:            
            bool        _stop_thread;
            std::thread _log_thread;
            std::string _log_dir;

            // global buffer list
            std::condition_variable_any   _write_list_cond;
            ::dsn::utils::ex_lock_nr_spin _write_list_lock;            
            std::list<buffer_info>        _write_list;

            // log file and line count
            int _start_index;
            int _index;
            int _per_thread_buffer_bytes;
            int _current_log_file_bytes;

            // current write file            
            std::ofstream *_current_log;
        };
    }
}
