/**
 *
 * Project 2 - Refugee camp water allocation
 *
 * @author Clay Shields
 *
 **/
 
#include <fstream>
#include <iostream>
#include <math.h>
#include <iomanip>
#include <string>
using namespace std;


int main(){


  const double minWaterPerPersonPerDay = 7.5;
  const double maxWaterPerPersonPerDay = 15;
  const double tapLitersPerMinute = 7.5;
  const double pumpLitersPerMinute = 17;
  const double wellLitersPerMinute = 12.5;
  const double litersToGallons = 3.78541;
  const double waterBufffaloCapacityGallons = 400;
  const double waterBuffaloCapacityLiters = 400 * litersToGallons;
  const int minutesWaterPerDay = 60 * 8;

  string inputFilename;
  ifstream datafile;
  
  string campName;
  unsigned int numRefugees = 0 ;
  unsigned int totalNumRefugees = 0;
  double waterNeeds = 0.0;
  int tapCount = 0;
  int wellCount = 0;
  int pumpCount = 0;


  double waterNeeded = 0;
  double waterAvailable = 0;
  double waterSurplus = 0;
  double waterDeficit = 0;
  
  double totalWaterSurplus = 0;
  double totalWaterDeficit = 0;
  
  int buffalosNeeded = 0;
  int buffalosExtra = 0;
  int totalBuffalosNeeded = 0;
  int totalBuffalosExtra = 0;
    


  cout << "Multiple camp water distribution helper" << endl;
  cout << "This program will read a file containing information about " << endl
       << "multiple refugee camps and determine which camps have enough " << endl
       << "water and which do not. It will then total the number of water " << endl
       << "buffalos needed to transport water between camps" << endl << endl;

  // cout << "The input file has a format of: " << endl
  //      << "<camp name> <num.refugees> <water needs> <taps> <wells> <pumps>" << endl
  //      << "where:" << endl
  //      << "     <camp name> is a single word with the name of the camp " << endl
  //      << "                 (spaces replaced with underscores if needed" << endl
  //      << "     <num.refugees> is the number of inhabitants of that camp" << endl
  //      << "     <water needs> is the liters of water needed per person per" << endl
  //      << "                   day at that camp (local conditions vary)" << endl
  //      << "     <taps> is the number of water taps available" << endl
  //      << "     <wells> is the number of wells available " << endl
  //      << "     <pumps> is the number of pumps available" << endl << endl << endl;
  
// Take a filename as input
  cout << "Please enter the name of the input file: ";
  getline (cin,inputFilename);
  
  // open file if it is there
  datafile.open(inputFilename.c_str());
  while (!datafile) {
    cout << "Could not open file: "<< inputFilename << " for reading." << endl;
    cout << "Please re-enter filename: ";
    getline (cin,inputFilename);
    datafile.open(inputFilename.c_str());
  }
  
  
  // cout format the output header
  cout << setw(10) << left << "Camp" << right << setw(10) << "Number" 
       << setw(15) << "Water" << setw (15) << "Surplus" 
       << setw(15) << "Water" << setw (15) << "Need" << endl;
  cout << setw(10) << left << "Name" << right << setw(10) << "Refugees" 
       << setw(15) << "Surplus" << setw (15) << "Buffalos" 
       << setw(15) << "Deficit" << setw (15) << "Buffalos" << endl;
  cout << setw(10) << left << "----" << right << setw(10) << "--------" 
       << setw(15) << "-------" << setw (15) << "--------" 
       << setw(15) << "-------" << setw (15) << "--------" << endl;

  // read each line in the file
  while (datafile >> campName >> numRefugees >> waterNeeds >> tapCount 
	 >> wellCount >> pumpCount){

  
    // do the error checking
    if (numRefugees < 0) {
      cout << "Negative number of refguees is not possible" << endl;
      return 0;
    }

 if (numRefugees > 100000) {
      cout << "No support for camps of over 100,000" << endl;
      return 0;
    }

   if ((waterNeeds < minWaterPerPersonPerDay) ||
       (waterNeeds > maxWaterPerPersonPerDay)){
     cout << "Water needs outside normal acceptable range" << endl;
     return 0;
   }

   if (tapCount < 0){
     cout << "Negative number of taps is not possible" << endl;
     return 0;
   }

   if (wellCount < 0){
     cout << "Negative number of wells is not possible" << endl;
     return 0;
   }

   if (pumpCount < 0){
     cout << "Negative number of pumps is not possible" << endl;
     return 0;
   }

   // Add up refugees

   totalNumRefugees += numRefugees;

   // Compute how much water is available and how much is needed

   waterNeeded = waterNeeds * numRefugees;
  
   // Calculate the water available

   waterAvailable = (((tapCount * tapLitersPerMinute) +
 		    (pumpCount * pumpLitersPerMinute) +
 		    (wellCount * wellLitersPerMinute))
		     * minutesWaterPerDay);


   //   cerr << "tap: " << tapCount << " pump: " << pumpCount << " well: " << wellCount
   //	<< " need: " << waterNeeded << " av: " << waterAvailable << endl; 

   if (waterAvailable == waterNeeded){
     buffalosNeeded = 0;    
     buffalosExtra = 0;
     waterSurplus = 0;
     waterDeficit = 0;
   }
   else {
     if (waterAvailable > waterNeeded){
       waterSurplus = waterAvailable - waterNeeded;
       totalWaterSurplus += waterSurplus;
       waterDeficit = 0;
       buffalosNeeded = 0;
       buffalosExtra = floor(waterSurplus/waterBuffaloCapacityLiters);
       totalBuffalosExtra += buffalosExtra;
     }
     else {
       waterSurplus = 0;
       waterDeficit = waterNeeded - waterAvailable;
       totalWaterDeficit += waterDeficit;
       buffalosNeeded = ceil(waterDeficit/waterBuffaloCapacityLiters);
       totalBuffalosNeeded += buffalosNeeded;
       buffalosExtra = 0;
     }

   }
  
   
   cout << left << setw(10) << campName 
	<< right << setw(10) << numRefugees
	<< setw(15) << waterSurplus 
	<< setw(15) << buffalosExtra
	<< setw(15) << waterDeficit 
	<< setw(15) << buffalosNeeded << endl;
    


  }

  cout << left << setw(10) << "----" << right << setw(10) << "--------" 
       << setw(15) << "-------" << setw (15) << "--------" 
       << setw(15) << "-------" << setw (15) << "--------" << endl;

  cout << left << setw(10) << "Totals:"
       << right << setw(10) << totalNumRefugees
	<< setw(15) << totalWaterSurplus 
	<< setw(15) << totalBuffalosExtra
	<< setw(15) << totalWaterDeficit 
	<< setw(15) << totalBuffalosNeeded << endl;
}