#include <unistd.h>
#include <merror.h>
#include <string.h>

#include "asm.h"
#include "mips.h"

void help(void) {
	printf("usage: masm [options] source.asm\n\n");
	printf("options:\n");
	printf("\t-h\t\tprints this help message\n");
	printf("\t-i isa\t\tselect a ISA to assemble to (mips32)\n");
	printf("\t-o output\tselect a output file destination\n");
}

int main(int argc, char **argv) {

	struct assembler_arguments args = {
		.isa = ISA_MIPS32,
		.in_file = NULL,
		.out_file = NULL,
	};

	int c;

	while ((c = getopt(argc, argv, "ho:i:")) != 1) {
		switch(c) {
		case 'h':
			help();
			return M_SUCCESS;
		case 'o':
			args.out_file = optarg;
			break;
		case 'i':
			if (strcmp(optarg, "mips32") == 0) {
				args.isa = ISA_MIPS32;
			} else {
				ERROR("invalid isa '%s'", optarg);
				return M_ERROR;
			}
			break;
		case '?':
			return M_ERROR;
		default:
			goto next;
		}
	}

next:
	if (optind < argc - 1) {
		ERROR("too many source files passed");
		return M_ERROR;
	}

	if (optind >= argc) {
		ERROR("no source files passed");
		return M_ERROR;
	}

	args.in_file = argv[optind];

	if (args.out_file == NULL) {
		args.out_file = "out.o";
	}

	return assemble_file(args);
}