#include "date.h"
#include <time.h>

void scan_date(date* ret_date)
{
    do
    {
        printf("Enter the day:");
        scanf("%d",&ret_date->day);
        printf("Enter the month:");
        scanf("%d",&ret_date->month);
        printf("Enter the year:");
        scanf("%d",&ret_date->year);
    }
    while(!validate_date(ret_date));

}

date* createFutureData(int day,int month,int year)
{
    date* gdate = getCurrentDate();
    date* ptr = (date*)malloc(sizeof(date));
    ptr->day = getCurrentDate()->day+day;
    ptr->month = getCurrentDate()->month+month;
    ptr->day = getCurrentDate()->year+year;
    return ptr;
}

date* getCurrentDate()
{
    time_t t = time(NULL);
    struct tm tm = *localtime(&t);
    date* ptr = (date*)malloc(sizeof(date));
    ptr->day =tm.tm_mday;
    ptr->month = tm.tm_mon+1;
    ptr->year = tm.tm_year+1900;
    return ptr;
}
/*
* return 1 if d1> d2
* return -1 if d2 > d1
* return 0 if d1 = d2
*/
int cmpdates(date* d1,date* d2)
{
    if(d1->year > d2->year) return 1;
    if(d1->year < d2->year) return -1;
    if(d1->year == d2->year)
    {
        if(d1->month > d2->month) return 1;
        if(d1->month < d2->month) return -1;
        if(d1->month==d2->month)
        {
            if(d1->day > d2->day) return 1;
            if(d1->day < d2->day) return -1;
            if(d1->day == d2->day) return 0;
        }
    }
}

void printDate(date* myDate)
{
    printf("\nDate year:%d - month:%d - day:%d\n",myDate->year,myDate->month,myDate->day);
}

/*
    Gets the string and splits it using the strtok method..
    Example 12-3-2010 =>day:12 month:3 year:2010
    and validates the date.. and returns current date if the date isnt valid.
 */
date* dateFromString(char* str2)
{
    date* ptr = malloc(sizeof(date));
    char *token;

    char str[strlen(str2)+1];
    strcpy(str,str2);

    token = strtok(str, "-");
    ptr->day = atoi(token);

    token = strtok(NULL, "-");
    ptr->month = atoi(token);

    token = strtok(NULL, "-");
    ptr->year = atoi(token);

    if(!validate_date(ptr))
    {
        printf("Invalid date loaded.. returned current date\n");
        return getCurrentDate();
    }
    return ptr;
}

int validate_date(date* d)
{
    if(d->day >= 31 || d->day <1) return 0;
    if(d->month >= 12 || d->month <1) return 0;
    if(d->year >= 2200 || d->year <1999) return 0;
    return 1;
}
void copy_date(date* dest,date* src)
{
    *dest = *src;
}
char* dateToString(date* myDate)
{
    char *date = malloc(12);
    strcat(date,myDate->day);
    strcat(date,"-");
    strcat(date,myDate->month);
    strcat(date,"-");
    strcat(date,myDate->year);
    return date;
}