#include <stdio.h>

#include "cart.h"
#include "nese.h"
#include "port.h"


static int nese_file_size(FILE* file) {
    int size = -1;
    if (0 == fseek(file, 0, SEEK_END)) {
        size = ftell(file);
    }
    return size;
}


int nese_start(nes* sys, const char* filename) {
    int status = 0;
    void* cart_data = NULL;
    int filesize = -1;
    FILE* file = NULL;

    file = fopen(filename, "rb");

    if (NULL == file) {
        status = -1;
    }

    if (0 == status) {
        filesize = nese_file_size(file);
        cart_data = nese_map_file(file, filesize);
        if (NULL == cart_data) {
            fprintf(stderr, "Failed to map %s\n", filename);
            status = -1;
        } else {
            status = nes_cart_load_mem(cart_data, filesize, sys);
        }
    }

    nes_init(sys);

    nes_loop(sys);

    if (cart_data) nese_unmap_file(cart_data, filesize);

    nes_done(sys);

    return 0;
}