// emulator.c

// SplitBit Emulator
// Small 8-Bit Harvard Architecture CPU
// Written by Anachronaut
// 10/15/2024
//
// ---- The machine with a terminal attached ----
//
// This is a front end and nothing else. The machine itself is in machine.c, shared with
// Voyager, which is the same machine with a screen and a speaker instead of a terminal.
//
// Keeping this file small is the point rather than a side effect: anything that ends up
// here is behaviour Voyager does not have, and the two are supposed to differ only in
// what they present. This builds and runs anywhere, with no graphics library, which is
// what keeps the whole toolchain and the whole suite dependency free.

#include "machine.h"
#include "utility.h"
#include <stdio.h>
#include <getopt.h>

int main(int argc, char *argv[]) {
    EmulatorOptions options;
    uint8_t result = parseOptions(argc, argv, &options);
    if (result == OPTIONS_HELP) {
        // The user asked for help and got it, which is not a failure.
        return 0;
    } else if (result == OPTIONS_ERROR) {
        // Bad command line, don't execute.
        return 1;
    }
    char *programFile = NULL;
    if (optind < argc) {
        programFile = argv[optind];
        optind++;
    }
    if (optind < argc) {
        fprintf(stderr, "Error: Unexpected argument: %s\n", argv[optind]);
        return 1;
    }

    Machine machine;
    uint8_t started = machineStart(&machine, &options, programFile);
    if (started == MACHINE_NOTHING_TO_RUN) {
        fprintf(stderr, "Error: No boot image and no disk, so there is nothing to run.\n");
        printHelp(argv[0]);
        return 1;
    } else if (started != MACHINE_OK) {
        return 1;
    }

    while (machineRunning(&machine)) {
        machineRunSlice(&machine);
    }

    machineStop(&machine);
    return machineReport(&machine);
}