// http://www.mediafire.com/?s1w45hdijht7026

#include <iostream>
#include <fstream>
#include <cstdlib>
#include <ctime>

using namespace std;

int main(int argc, char** argv){
    if (argc < 2){
        cout << "random .sho generator (HertzDevil made this)\n";
        cout << "generates mario paint song file randomly\n";
        cout << "usage: randsho [filename] ([size])\n";
        cout << "[filename]: valid filename\n";
        cout << "[size]: length of the song in quarter notes. maximum is 2880, default is 96\n";
        exit(0);}

    srand(time(0));
    fstream sho(argv[1], ios::out | ios::binary);
    int songSize = argc >= 3 ? atoi(argv[2]) : 96;

    if (songSize < 1 || songSize > 2880){
        cout << "INVALID SONG LENGTH!\n";
        exit(0);}

    // .sho header
    sho.put('s');
    sho.put('h');
    sho.put('r');
    sho.put('o');
    sho.put(argc >= 3 ? 3 : 2);
    sho.put(0);
    sho.put(0);

    // random title and author. (only 31 chars long, 2 unused bytes)
    for (int i = 0; i < 64; i++){
        sho.put(32 + rand() % 95);}

    // ignored currently
    const char* inst = "default.shi";
    sho.write(inst, 11);
    for (int i = 0; i < 21; i++){
        sho.put(0);}

    // long .sho inserts header here
    if (songSize > 96){
        // end of loop
        sho.write(reinterpret_cast<char*>(&songSize), 2);
        // loop, boolean
        sho.put(rand() % 2);
        // time signature, 0 for 3/4, 1 for 4/4
        sho.put(rand() % 2);
        // tempo
        sho.put(rand() % 0xA0);}

    // song data
    for (int i = 0; i < (songSize > 96 ? songSize : 96)*3; i++){
        // each note is 4 times as common as no note
        int note = rand() % 53;
        // the note
        sho.put(note == 52 ? 0xFF : note % 13 + 1);
        // the instrument
        sho.put(note == 52 ? 0xDF : rand() % 15);}

    // short .sho inserts header here
    if (songSize <= 96){
        // tempo
        sho.put(rand() % 0xA0);
        // end of loop
        sho.put(songSize);
        // loop, boolean
        sho.put(rand() % 2);
        // time signature, 0 for 3/4, 1 for 4/4
        sho.put(rand() % 2);}

    // fucking done
    sho.close();
    return 0;}