/**
 * Got Objective-C to compile on Windows thanks to this Stackoverflow post:
 * http://stackoverflow.com/questions/56708/objective-c-for-windows
 *
 * Build command:
 *    gcc -o helloworld.exe helloworld.m -I /GNUstep/GNUstep/System/Library/Headers -L /GNUstep/GNUstep/System/Library/Libraries -std=c99 -lobjc -lgnustep-base -fconstant-string-class=NSConstantString
*/

#include <stdio.h>
#include <Foundation/Foundation.h>

// Structures
struct Album
{
    int year;
    int tracks;
    int duration;
    NSString *title;
};

// Function Prototypes

int multiplyByFive(int a);
double averageDuration(double duration, int tracks);
void albumInfo(struct Album theAlbum);
int helloWorld();
NSString *myName = @"Captain Obvious";

int main(void)
{

    // Declaring two album structures
    struct Album yourAlbum;
    struct Album myAlbum;

    // Giving the albums some properties
    myAlbum.year = 1998;
    myAlbum.tracks = 20;
    myAlbum.title = @"Album A";
    myAlbum.duration = 45;
    yourAlbum.year = 2001;
    yourAlbum.tracks = 18;
    yourAlbum.title = @"Album B";
    yourAlbum.duration = 60;

    // helloWorld() returns the length of the given name
    int nameLength = helloWorld(myName);

    // Console output
    NSLog(@"The length of your name multiplied by five is %d.\n", multiplyByFive(nameLength));

    // Outputting album info

    albumInfo(myAlbum);
    albumInfo(yourAlbum);

    return 0;
}

// Function Implementations

int multiplyByFive(int a)
{
    return a * 5;
}

double averageDuration(double duration, int tracks)
{
    return duration / tracks;
}

void albumInfo(struct Album theAlbum)
{
    NSLog(@"The album '%@', was released in %d, lasts %d minutes and had %d tracks, with an average track length of %f minutes.\n", theAlbum.title, theAlbum.year, theAlbum.duration, theAlbum.tracks, averageDuration(theAlbum.duration, theAlbum.tracks));
}

int helloWorld(NSString *theName)
{
    NSLog(@"Hello %@! Your name is %d characters long.\n", theName, [theName length]);
    return [theName length];
}