/* main.c

   This file is part of the "First" CPU simulator project.

   Copyright (c) 2024 Efthymios Kritikos

   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 <http://www.gnu.org/licenses/>.  */

#include <stdio.h>
#include <stdlib.h>
#include "gui.h"
#include "simdata.h"
#include "stdint.h"
#include <unistd.h>
#include <errno.h>

void help(char* progname){
	printf("Usage: %s  -i <file> \n", progname);
}

int main(int argc, char* argd[] ){
	/// PARSE COMMAND LINE ///
	char *infile = NULL;
	int opt;
	while ((opt = getopt(argc, argd, "hi:")) != -1) {
		switch (opt) {
			case 'h':
				help(argd[0]);
				return 0;
				break;
			case 'i':
				infile=optarg;
			break;
			default:
				help(argd[0]);
				return 1;
				break;
		}
	}
	if (infile==NULL){
		help(argd[0]);
		return 1;
	}

	/// READ ROM FILE ///
	FILE* rom=fopen(infile,"r");

	if (rom == NULL) {
		printf("ERROR: Couldn't open rom file\n");
		perror(infile);
		return 1;
	}

	fseek(rom, 0, SEEK_END);
	if(ftell(rom)!=16777216){
		printf("ERROR: ROM file isn't 16MiB\n");
		return 1;
	}
	fseek(rom, 0, SEEK_SET);

	uint8_t *RAM=malloc(16777216); //Maximum addressable memory
	if(!RAM){
		gui_error("failed to allocate 16MiB of memory for the system ram");
		return 1;
	}
	if(fread(RAM, 16777216, 1, rom)==0){
		printf("ERROR: failed to read input file\n");
		free(RAM);
		return 1;
	}
	fclose(rom);


	/// INITIALISE GUI ///
	if(start_gui()){
		printf("Failed on start_gui()\n");
		free(RAM);
		return 1;
	}

	struct simdata_t *simdata = init_simdata();
	if(!simdata){
		gui_error("failed to initialise simdata");
		free(RAM);
		return 1;
	}

	if(gui_continue_request()){
		end_gui();
		printf("Failed on gui_continue_request()\n");
		free_simdata(simdata);
		free(RAM);
		return 1;
	}

	if(end_gui()){
		printf("Failed on end_gui()\n");
		free_simdata(simdata);
		free(RAM);
		return 1;
	}

	free_simdata(simdata);
	free(RAM);
	return 0;
}