#include "stdstuff.h"
#include "customerDB.h"

// add a new customer to the database; returns true if successful, false otherwise
// (database full or customer already exists)
bool addCustomer(int id, double total, customerDB &db) {
     
   if(db.numCusts==MAXCUST) return false; // database is full
   
   for(int i=0;i<db.numCusts;i++) {       
      if(db.ci[i].id==id) return false; // Customer already in database
   }
   
   // insert Customer at end
   db.ci[db.numCusts].id = id;
   db.ci[db.numCusts].total = total;
   db.numCusts++; // we've added a Customer
   return true; // success
}

// remove a customer from the database; returns true if successful, false otherwise (customer
// does not exist)
bool removeCustomer(int id, customerDB &db) {
   
   for(int i=0;i<db.numCusts;i++) {
      if(db.ci[i].id==id) { // found it 
         db.numCusts--;
         db.ci[i] = db.ci[db.numCusts]; // decrement number of customers and move last one into ith pos'n
         return true; // Customer removed
      }
   }
   
   return false; // Customer does not exist in database
}

// prints the full customer database (or a note if the database is empty); 
// Customers are printed one per line, with 2 decimals for the total.
void printCustomerDatabase(const customerDB &db) {
     
   cout << setiosflags(ios::fixed|ios::showpoint); 
   cout << setprecision(2); // to get 2 decimal places for total
   
   if(db.numCusts==0) { // empty database
      cout << "Customer database is empty.\n";
      return;
   }
   
   // otherwise print each Customer (one per line)
   for(int i=0;i<db.numCusts;i++) {
      cout << "Customer id: " << db.ci[i].id;
      cout << "  Customer total: " << db.ci[i].total << endl;
   }
}

// change the customer number of an existing customer; returns true if successful, 
// false otherwise (customer does not exist, or new customer number in use)
bool changeCustomerID(int id, int nid, customerDB &db) {
      
   for(int i=0;i<db.numCusts;i++) { // check that new id not being used
      if(db.ci[i].id==nid) return false; // new id already in use
   }
     
   for(int i=0;i<db.numCusts;i++) {
      if(db.ci[i].id==id) { // found the one we want to change
         db.ci[i].id = nid; // change the id
         return true; // Customer information updated
      }
   }
   
   return false; // Customer does not exist in database
}

// change the customer total of an existing customer; returns true if successful, 
// false otherwise (customer does not exist)
bool changeCustomerTotal(int id, double ntotal, customerDB &db) {
     
   for(int i=0;i<db.numCusts;i++) {
      if(db.ci[i].id==id) { // found the one we want to change so update total
         db.ci[i].total = ntotal;
         return true; // Customer information updated
      }
   }
   
   return false; // Customer does not exist in database
}

// returns the highest total of all customers 
// (returns -1 if there are no customers in the database)
double getBestCustomerTotal(const customerDB &db) {
   double maxtotal;
       
   if(db.numCusts==0) return -1; // return -1 if database empty
   
   maxtotal = db.ci[0].total; // assume first total is largest and then check the rest
   
   for(int i=1;i<db.numCusts;i++) {
      if(db.ci[i].total>maxtotal)
         maxtotal=db.ci[i].total;
   }
   
   return maxtotal;
}