#include <stdio.h>
#include <math.h>
#include <string.h>


//Time struct used to represent a time of day or an amount of time that has elapsed.
typedef struct {
  int hour;
  int minute;
} Time;


/*Car struct  which has a car's plate number,
its parking permit status, time entered a lot and what lot it's parked in */
typedef struct {
  char *plateNumber;
  char permit;
  Time enteringTime;
  int lotParkedIn;
} Car;

/*
ParkingLot struct which contains:
It's unique lot number
Hourly rate for parking in the lot and the maximum amount you can be charged
Max capacity of cars and current amount of cars
Revenue made by the lot
*/
typedef struct {
  int lotNumber;
  double hourlyRate;
  double maxCharge;
  int capacity;
  int currentCarCount;
  double revenue;
} ParkingLot;

// Sets the hours and minutes amount for the given time t based
// on the specified hours h.  (e.g., 1.25 hours would be 1 hour
// and 15 minutes)
void setHours(Time *t, double h) {
  t->hour =(h - (fmod(h,1.0))); // subtracts the decimal portion(minutes) of the hour, obtained via floating point modulus
  t->minute= fmod(h,1.0)*60.0; //multiplies the decimal portion of the hour number provided by 60(num of mins in an hour)
}

// Takes two Time objects (not pointers) and computes the difference
// in time from t1 to t2 and then stores that difference in the diff
// Time (which must be a pointer)
// Converts both given times in terms of hours then uses setHours function to set given difference time pointer
void difference(Time t1, Time t2, Time *diff) {
  double t1Hours = t1.hour + (t1.minute*60);
  double t2Hours = t2.hour + (t2.minute*60);
  setHours(diff,fabs(t1Hours-t2Hours));
}


// Initialize the car pointed to by c to have the given plate and
// hasPermit status.  The car should have it’s lotParkedIn set to
// 0 and enteringTime to be -1 hours and -1 minutes.
void initializeCar(Car *c, char *plate, char hasPermit) {
  strcpy(c->plateNumber, plate);
  c->permit = hasPermit;
  c->lotParkedIn = 0;
  c->enteringTime.hour = -1;
  c->enteringTime.minute = -1;
}


// Initialize the lot pointed to by p to have the given number,
// capacity, hourly rate and max charge values.  The currentCarCount
// and revenue should be at 0.
void initializeLot(ParkingLot *p, int num, int cap, double rate, double max) {
  p->lotNumber = num;
  p->capacity = cap;
  p->hourlyRate = rate;
  p->maxCharge = max;
  p->currentCarCount = 0;
  p->revenue = 0.0;
}

// Print out the parking lot parameters so that is displays as
// follows:   Parking Lot #2 - rate = $3.00, capacity 6, current cars 5
void printLotInfo(ParkingLot p) {
  printf("Parking Lot #%d - rate = $%-3.2f, capacity %d, current cars %d",p.lotNumber,p.hourlyRate,p.capacity,p.currentCarCount);
}


// Simulate a car entering the parking lot
void carEnters(ParkingLot *lot,Car *car,int hour, int min){

}

// Simulate a car leaving the parking lot
void carLeaves(ParkingLot *lot,Car *car,int hour, int min){

}

int main() {
  Car  car1, car2, car3, car4, car5, car6, car7, car8, car9;
  ParkingLot p1, p2;

  // Set up 9 cars
  initializeCar(&car1, "ABC 123", 0);
  initializeCar(&car2, "ABC 124", 0);
  initializeCar(&car3, "ABD 314", 0);
  initializeCar(&car4, "ADE 901", 0);
  initializeCar(&car5, "AFR 304", 0);
  initializeCar(&car6, "AGD 888", 0);
  initializeCar(&car7, "AAA 111", 0);
  initializeCar(&car8, "ABB 001", 0);
  initializeCar(&car9, "XYZ 678", 1);

  // Set up two parking lots
  initializeLot(&p1, 1, 4, 5.5, 20.0);
  initializeLot(&p2, 2, 6, 3.0, 12.0);

  printLotInfo(p1);
  printLotInfo(p2);
  printf("\n");

  // Simulate cars entering the lots
  carEnters(&p1, &car1, 7, 15);
  carEnters(&p1, &car2, 7, 25);
  carEnters(&p2, &car3, 8,  0);
  carEnters(&p2, &car4, 8, 10);
  carEnters(&p1, &car5, 8, 15);
  carEnters(&p1, &car6, 8, 20);
  carEnters(&p1, &car7, 8, 30);
  carEnters(&p2, &car7, 8, 32);
  carEnters(&p2, &car8, 8, 50);
  carEnters(&p2, &car9, 8, 55);

  printf("\n");
  printLotInfo(p1);
  printLotInfo(p2);
  printf("\n");

  // Simulate cars leaving the lots
  carLeaves(&p2, &car4, 9, 0);
  carLeaves(&p1, &car2, 9, 5);
  carLeaves(&p1, &car6, 10, 0);
  carLeaves(&p1, &car1, 10, 30);
  carLeaves(&p2, &car8, 13, 0);
  carLeaves(&p2, &car9, 15, 15);
  carEnters(&p1, &car8, 17, 10);
  carLeaves(&p1, &car5, 17, 50);
  carLeaves(&p2, &car7, 18, 0);
  carLeaves(&p2, &car3, 18, 15);
  carLeaves(&p1, &car8, 20, 55);

  printf("\n");
  printLotInfo(p1);
  printLotInfo(p2);
  printf("\n");

  // Display the total revenue
  printf("Total revenue of Lot 1 is $%4.2f\n", p1.revenue);
  printf("Total revenue of Lot 2 is $%4.2f\n", p2.revenue);
}