/*
 * 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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301, USA.
 *
 */

#include <map>
#include <array>
#include <string>
#include <iostream>
#include <fstream>
#include <exception>
#include <regex>
#include <type_traits>
#include <variant>
#include <getopt.h>

#include "include/rd_mouse.h"
#include "include/load_config.h"
#include "include/help.h"

// this is the default version string
// the version string gets overwritten by the makefile
#ifndef VERSION_STRING
#define VERSION_STRING "no version defined during compilation"
#endif


// this allows the creation of overloaded lambda functions
template< typename T1, typename T2 > struct overload : T1, T2  {
	overload(T1 a, T2 b) : T1(a), T2(b) {};
	using T1::operator();
	using T2::operator();
};


// this function checks its arguments and opens the mouse accordingly
// (with vid and pid or with bus and device)
template< typename T >int open_mouse_wrapper( T &m, const bool flag_bus, const bool flag_device,
	const std::string &string_bus, const std::string &string_device );



// main function
int main( int argc, char **argv ){
	
	try{
		// if no arguments: print help
		if( argc == 1 ){
			std::cout << mouse_m908_help;
			return 0;
		}
		
		//command line options
		static struct option long_options[] = {
			{"help", no_argument, 0, 'h'},
			{"config", required_argument, 0, 'c'},
			{"profile", required_argument, 0, 'p'},
			{"macro", required_argument, 0, 'm'},
			{"number", required_argument, 0, 'n'},
			{"bus", required_argument, 0, 'b'},
			{"device", required_argument, 0, 'd'},
			{"kernel-driver", no_argument, 0, 'k'},
			{"version", no_argument, 0, 'v'},
			{"dump", required_argument, 0, 'D'},
			{"read", required_argument, 0, 'R'},
			{"model", required_argument, 0, 'M'},
			{0, 0, 0, 0}
		};
		
		bool flag_config = false, flag_profile = false;
		bool flag_macro = false, flag_number = false;
		bool flag_bus = false, flag_device = false;
		bool flag_kernel_driver = false;
		bool flag_dump_settings = false;
		bool flag_read_settings = false;
		
		std::string string_config, string_profile;
		std::string string_macro, string_number;
		std::string string_bus, string_device;
		std::string string_dump, string_read;
		std::string string_model = "";
		
		//parse command line options
		int c, option_index = 0;
		while( (c = getopt_long( argc, argv, "hc:p:m:n:b:d:kvD:R:M:",
		long_options, &option_index ) ) != -1 ){
			
			switch( c ){
				case 'h':
					std::cout << mouse_m908_help;
					return 0;
					break;
				case 'c':
					flag_config = true;
					string_config = optarg;
					break;
				case 'p':
					flag_profile = true;
					string_profile = optarg;
					break;
				case 'm':
					flag_macro = true;
					string_macro = optarg;
					break;
				case 'n':
					flag_number = true;
					string_number = optarg;
					break;
				case 'b':
					flag_bus = true;
					string_bus = optarg;
					break;
				case 'd':
					flag_device = true;
					string_device = optarg;
					break;
				case 'k':
					flag_kernel_driver = true;
					break;
				case 'v':
					std::cout << "Version: " << VERSION_STRING << "\n";
					return 0;
					break;
				case 'D':
					flag_dump_settings = true;
					string_dump = optarg;
					break;
				case 'R':
					flag_read_settings = true;
					string_read = optarg;
					break;
				case 'M':
					string_model = optarg;
					break;
				case '?':
					break;
				default:
					break;
			}
		}

		// print a list of valid model names
		if( string_model == "?" ){
			variant_loop<rd_mouse::mouse_variant>( [](auto m){
				if( m.get_name() != rd_mouse::monostate::get_name() )
					std::cout << m.get_name() << "\n";
			} );
			return 0;
		}
		
		rd_mouse::mouse_variant mouse;
		
		if( string_model == "" )
			mouse = rd_mouse::detect();
		else
			mouse = rd_mouse::detect(string_model);
		
		if( std::holds_alternative<rd_mouse::monostate>(mouse) ){
			throw std::string( 
				"Couldn't detect mouse.\n"
				"- Check hardware and permissions (maybe you need to be root?)\n"
				"- Try with the --model option\n"
				"If nothing works please report this as a bug."
			);
		}
		
		// lambda function to perform all actions on the mouse
		auto perform_actions = overload(
			[](rd_mouse::monostate){},
			[&](auto& m){

				// set whether to detach kernel driver
				m.set_detach_kernel_driver( !flag_kernel_driver );
				
				// open mouse, throws std::string in case of an error, handling in main()
				open_mouse_wrapper( m, flag_bus, flag_device, string_bus, string_device );
				
				try{
					// read settings and dump raw data
					if( flag_dump_settings ){
						
						// dump to file or cout
						if( string_dump != "-" ){
							std::ofstream out( string_dump );
							
							if( out.is_open() ){				
								// dump settings
								m.dump_settings( out );
							
								out.close();
							} else{
								throw std::string( "Couldn't open "+string_dump );
							}
						} else{
							m.dump_settings( std::cout );
						}
						
					}
					
					// read settings and print in .ini format
					if( flag_read_settings ){
						
						// dump to file or cout
						if( string_read != "-" ){
							std::ofstream out( string_read );
							
							if( out.is_open() ){
								out << "# Model: " << m.get_name() << "\n";
								// read settings
								m.read_and_print_settings( out );
							
								out.close();
							} else{
								throw std::string( "Couldn't open "+string_read );
							}
						} else{
							std::cout << "# Model: " << m.get_name() << "\n";
							m.read_and_print_settings( std::cout );
						}
						
					}
					
					// load and write config
					if( flag_config ){
						
						simple_ini_parser pt;
						if( pt.read_ini( string_config ) != 0 )
							throw std::string( "Could not open configuration file." );
						
						//parse config file
						for( int i = 1; i < 6; i++ ){
							
							rd_mouse::rd_profile profile = (rd_mouse::rd_profile)(i - 1);

							for( auto& lightmode : m.lightmode_strings() ){
								if( pt.get("profile"+std::to_string(i)+".lightmode", "") == lightmode.second )
									m.set_lightmode( profile, lightmode.first );
							}

							if( std::regex_match( pt.get("profile"+std::to_string(i)+".color", ""), std::regex("[0-9a-fA-F]{6}") ) ){
								m.set_color( profile,
								{(uint8_t)stoi( pt.get("profile"+std::to_string(i)+".color", "").substr(0,2), 0, 16),
								(uint8_t)stoi( pt.get("profile"+std::to_string(i)+".color", "").substr(2,2), 0, 16), 
								(uint8_t)stoi( pt.get("profile"+std::to_string(i)+".color", "").substr(4,2), 0, 16)} );
							}
							
							if( pt.get("profile"+std::to_string(i)+".brightness", "").length() != 0 ){
								m.set_brightness( profile, (uint8_t)stoi( pt.get("profile"+std::to_string(i)+".brightness", ""), 0, 16) );
							}
							
							if( pt.get("profile"+std::to_string(i)+".speed", "").length() != 0 ){
								m.set_speed( profile, (uint8_t)stoi( pt.get("profile"+std::to_string(i)+".speed", ""), 0, 16) );
							}
							
							if( pt.get("profile"+std::to_string(i)+".scrollspeed", "").length() != 0 ){
								m.set_scrollspeed( profile, (uint8_t)stoi( pt.get("profile"+std::to_string(i)+".scrollspeed", ""), 0, 16) );
							}
							
							// DPI
							for( int j = 1; j < 6; j++ ){
								
								// DPI level disabled
								if( pt.get("profile"+std::to_string(i)+".dpi"+std::to_string(j)+"_enable", "") == "0" )
									m.set_dpi_enable( profile, j-1, false );
								
								// DPI value
								if( pt.get("profile"+std::to_string(i)+".dpi"+std::to_string(j), "").length() != 0 ){ // non-empty dpi value
									
									if( m.set_dpi( profile, j-1, pt.get("profile"+std::to_string(i)+".dpi"+std::to_string(j), "") ) != 0 ) // if invalid dpi value
										std::cerr << "Warning: Unknown DPI value " << pt.get("profile"+std::to_string(i)+".dpi"+std::to_string(j), "") << "\n";
								}
							}
							
							for( auto& report_rate : m.report_rate_strings() ){
								if( pt.get("profile"+std::to_string(i)+".report_rate", "") == report_rate.second )
									m.set_report_rate( profile, report_rate.first );
							}

							// button mapping
							for( auto key : m.button_names() ){
								if( pt.get("profile"+std::to_string(i)+"."+key.second, "").length() != 0 ){ m.set_key_mapping( profile, key.first, pt.get("profile"+std::to_string(i)+"."+key.second, "") );	}
							}
							
						}
						
						// write settings
						m.write_settings();
						
					}
					
					// change active profile
					if( flag_profile ){
						
						// set profile
						if( !std::regex_match( string_profile, std::regex("[1-5]") ) )
							throw std::string( "Wrong argument, expected 1-5." );

						m.set_profile( (rd_mouse::rd_profile)(std::stoi(string_profile) - 1) );

						// write profile
						m.write_profile();
						
					}
					
					// send all macros
					if( flag_macro && !flag_number ){
						
						// load macros
						int r = m.set_all_macros( string_macro );
						
						if( r != 0 )
							throw std::string( "Couldn't load macros." );
						
						// write macros
						for( int i = 1; i < 16; i++ )
							m.write_macro(i);
						
					}
					
					// send individual macro
					if( flag_macro && flag_number ){
						
						
						// set macro and macro slot (number)
						int number;
						
						if( std::regex_match( string_number, std::regex("[0-9]+") ) ){
							number = (int)stoi(string_number);
						} else{
							throw std::string( "Wrong argument, expected 1-15." );
						}
						
						if( number < 1 || number > 15 )
							throw std::string( "Wrong argument, expected 1-15." );
						
						if( m.set_macro( number, string_macro ) != 0 )
							throw std::string( "Couldn't load macro" );
						
						// write macro
						m.write_macro(number);
						
					} else if( !flag_macro && flag_number ){
						throw std::string( "Misssing option, --macro and --number must be used together." );
					}
				
				
				// error handling
				} catch( std::string const &message ){ // close mouse, rethrow
					
					m.close_mouse();
					throw message;
					
				} catch( std::exception const &e ){ // close mouse, rethrow
					
					m.close_mouse();
					throw e;
					
				}
				
				// close mouse
				m.close_mouse();

			}
		);

		std::visit( [&](auto&& arg){ perform_actions(arg); }, mouse );

	} catch( std::string const &message ){ // print error message and quit
		
		std::cerr << message << "\n";
		return 1;
		
	} catch( std::exception const &e ){ // handle exceptions
		
		std::cerr << "An exception occured:\n" << e.what() << "\n";
		return 1;
		
	}
	
	return 0;
}

template< typename T >int open_mouse_wrapper( T &m, const bool flag_bus, const bool flag_device,
	const std::string &string_bus, const std::string &string_device ){
	
	int open_return = 0; // open_mouse() return value
	
	if( flag_bus != flag_device ){ // improper arguments
		
		throw std::string( "Missing argument, --bus and --device must be used together." );
		return 1;
		
	} else if( flag_bus && flag_device ){ // open with bus and device
		
		if( !std::regex_match( string_bus, std::regex("[0-9]+") ) ||
			!std::regex_match( string_device, std::regex("[0-9]+") ) ){
			
			throw std::string( "Wrong argument, expected number." );
			return 1;
		}
		
		open_return = m.open_mouse_bus_device( stoi(string_bus), stoi(string_device) );
		
	} else{ // open with vid and pid
		
		open_return = m.open_mouse();
		
	}
	
	// Could not open → print message
	if( open_return != 0 ){
		
		throw std::string(
			"Couldn't open mouse.\n"
			"- Check hardware and permissions (maybe you need to be root?)\n"
			"- Try with or without the --kernel-driver option\n"
			"- Try with the --model option\n"
			"- Try with the --bus and --device options\n"
			"If nothing works please report this as a bug."
		);
		
		return 1;
	}
	
	return 0;
}