/* City Ranking Viewer:
*/

#include<stdio.h>

#define SWAP 1
#define NO_SWAP 0


typedef struct {
    int Ranking;
    char CityName[25];
    char State[15];
    int Population;
    float PercentChange;
} city_t;

void swap(city_t *x, city_t *y);
void bubblesort(city_t *x, int len, int sorttype);
void printcities(city_t *x, int len);


int main(void)
{

    char fileName[50];
    city_t cities[10];
    int choice, i;



    printf("Welcome to Cities Database Viewer v0.1!\n");
    printf("Please enter the filename you wish to open:");
    scanf("%s", fileName);

    FILE *inp = fopen(fileName, "r");



//  while(1)
//  {
        if(inp==NULL)
        {
            printf("File does not exist! Program will terminate");
            return(0);
        }

        else
        {

            while(1)
            {
                if(feof(inp))
                    break;

                else
                {
                    i=0;
                    fscanf(inp, "%d%s%s%d%f", &cities[i].Ranking, cities[i].CityName, cities[i].State, &cities[i].Population, &cities[i].PercentChange);
                    i++;
                }
            }
        }
//  }

    printf("Program uploaded successfully!");

    while(1)
    {
        printf("How do you wish to view the cities?\n1:Ranking\n2:City Name (A-z)\n3:State(A-Z)\n4:Population\n5:Percent Change\n6:Quit\n");
        fflush(stdin);
        scanf("%d", &choice);

        if(choice<1 || choice>7)
            printf("Invalid selection!\n");


        else if(choice>0 && choice<6)
        {
//          bubblesort(cities, 10, choice);
            printcities(cities, 10);
        }

        else
            break;

    }

    return(0);

}

void swap(city_t *x, city_t *y)
{
    city_t temp;
    temp = *x;
    *x = *y;
    *y=temp;
}

void bubblesort(city_t *x, int len, int sorttype)
{
    int flag=SWAP;
    city_t *i;

    while(flag==SWAP)
    {
        flag=NO_SWAP;
        for(i=x; i<x+len-1; i++)
        {
            if(sorttype==1)
            {
                if(i->Ranking > (i+1)->Ranking)
                {
                    swap(i, i+1);
                    flag=SWAP;
                }
            }

            if(sorttype==2)
            {
                if(i->CityName > (i+1)->CityName)
                {
                    swap(i, i+1);
                    flag=SWAP;
                }
            }
            if(sorttype==3)
            {
                if(i->State > (i+1)->State)
                {
                    swap(i, i+1);
                    flag=SWAP;
                }
            }
            if(sorttype==4)
            {
                if(i->Population > (i+1)->Population)
                {
                    swap(i, i+1);
                    flag=SWAP;
                }
            }
            if(sorttype==5)
            {
                if(i->PercentChange > (i+1)->PercentChange)
                {
                    swap(i, i+1);
                    flag=SWAP;
                }
            }

        }
    }
}


void printcities(city_t *x, int len)
{
    int i;
    for(i=0; i<len; i++)
    {
        printf("%d %s %s %d %2f\n", x[i].Ranking, x[i].CityName, x[i].State, x[i].Population, x[i].PercentChange);
    }
}