/* Copyright (C) 2016 Jeremiah Orians
 * This file is part of stage0.
 *
 * stage0 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.
 *
 * stage0 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 stage0.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "vm.h"

/* Load program tape into Memory */
void load_program(struct lilith* vm, char **argv)
{
	FILE* program;
	program = fopen(argv[1], "r");

	/* Figure out how much we need to load */
	fseek(program, 0, SEEK_END);
	size_t end = ftell(program);
	rewind(program);

	/* Load the entire tape into memory */
	fread(vm->memory, 1, end, program);

	fclose(program);
}

void execute_vm(struct lilith* vm)
{
	struct Instruction* current;
	current = calloc(1, sizeof(struct Instruction));

	while(!vm->halted)
	{
		read_instruction(vm, current);
		eval_instruction(vm, current);
	}

	free(current);
	return;
}

/* Standard C main program */
int main(int argc, char **argv)
{
	/* Make sure we have a program tape to run */
	if (argc < 2)
	{
		fprintf(stderr, "Usage: %s $FileName\nWhere $FileName is the name of the paper tape of the program being run\n", argv[0]);
		return EXIT_FAILURE;
	}

	/* Perform all the essential stages in order */
	struct lilith* vm;
	tape_01_name = "tape_01";
	tape_02_name = "tape_02";
	vm = create_vm(1 << 21);
	load_program(vm, argv);
	execute_vm(vm);
	destroy_vm(vm);

	return EXIT_SUCCESS;
}