/// Reservation.cpp
// Qian Lao
// 01/15/2019
// CIS-054-101 C/C++ Programming
// Inputs: number of rows, and seats; seat selection
// Outputs: reserve seats, check if seat is already taken, check if all seats are taken

#include <iostream>
#include <cctype>
using namespace std;

// Function declarations (prototypes)
char **CreateArrayOfSeats (int NumberOfRows, int seats);
void InitializeSeats (char **ArrayOfSeats, int NumberOfRows, int seats);
void DisplayArrayOfSeats (char **ArrayOfSeats, int NumberOfRows, int seats);
void MemoryCleanup (char **ArrayOfSeats, int NumberOfRows, int seats);

int main(int argc, char* argv[])
{
    char **ArrayOfSeats;
    int NumberOfRows;
    int NumberOfSeats;
    char rowSelection;  // 1 to max NumberOfRows, input from the user
    char seatSelection; // 'A' to max seats, input from the user, convert to a number
    int row;    // index into ArrayOfSeats, 0 to NumberOfRows-1
    int seat;   // index into ArrayOfSeats, 0 to seats-1
    char answer;
       int counter=0;

    // get the number of NumberOfRows and seats from the user
    cout << "Enter the number of NumberOfRows: ";
    cin  >> NumberOfRows;
    cout << "Enter the number of seats on each row: ";
    cin  >> NumberOfSeats;

    ArrayOfSeats = CreateArrayOfSeats(NumberOfRows, NumberOfSeats);
    InitializeSeats (ArrayOfSeats, NumberOfRows, NumberOfSeats);
    DisplayArrayOfSeats  (ArrayOfSeats, NumberOfRows, NumberOfSeats);

    do
    {

        cout << endl << "Enter a seat selection" << endl << "  (example 5F -or- 00 to quit): ";
        cin  >> rowSelection;       // get row from the user
        cin  >> seatSelection;      // get the seat from the user
        if (rowSelection=='0')
            continue;               // skip the rest of the loop

        seatSelection = toupper(seatSelection); // convert to upper case
        row = rowSelection - '1';     // count from zero to work with the array
        seat = seatSelection - 'A';   // convert 'A' to 0, 'B' to 1, 'C' to 2, etc.

        if ((row<0||row>NumberOfRows)||(seat<0||seat>NumberOfSeats))
            cout<<"Invalid input";



        if (ArrayOfSeats [row][seat]=='-')
            cout<<"This seat is taken"<<endl;
        else ArrayOfSeats [row][seat]='-';



        cout<<"Do you want to select another seat? Y/N "<<endl;
        cin>>answer;


        counter++;
            if (counter==NumberOfRows*NumberOfSeats)
                {cout<<"All seats are taken"<<endl;
                DisplayArrayOfSeats  (ArrayOfSeats, NumberOfRows, NumberOfSeats);
                return 0;}



        DisplayArrayOfSeats (ArrayOfSeats, NumberOfRows, NumberOfSeats);

    } while ((rowSelection != '0')&&(answer=='Y'||answer=='y')&&(counter<=NumberOfRows*NumberOfSeats));

    MemoryCleanup (ArrayOfSeats, NumberOfRows, NumberOfSeats);   // return the memory

    return 0;
}

char **CreateArrayOfSeats (int NumberOfRows, int seats)    // ** means pointer to pointers
{
    char **ArrayOfSeats;
    ArrayOfSeats = new char*[NumberOfRows];          // create array of pointers for NumberOfRows
    for(int r = 0; r < NumberOfRows; r++)
        ArrayOfSeats[r] = new char[seats];   // create an array of seats for each row
    return ArrayOfSeats;                     // return pointer to the array back to main program
}

void InitializeSeats (char **ArrayOfSeats, int NumberOfRows, int seats)
{
    for (int r=0; r<NumberOfRows; r++)          // initialize the data for each row
    {
        for (int s=0; s<seats; s++)
            ArrayOfSeats[r][s] = 'A' + s;    // put 'A' 'B' 'C' etc in each row
    }
}

void DisplayArrayOfSeats (char **ArrayOfSeats, int NumberOfRows, int NumberOfSeats)
{
    for (int r=0; r<NumberOfRows; r++)              // for each row
    {
        cout.width(2);
        cout << r+1 << ' ';                 // Display row numbers starting from 1
        for (int s=0; s<NumberOfSeats; s++)
            cout << ArrayOfSeats[r][s] << ' ';   // Display info for each seat
        cout << endl;                       // new line after each row
    }
}

void MemoryCleanup (char **ArrayOfSeats, int NumberOfRows, int NumberOfSeats)
{
    for (int r=0; r<NumberOfRows; r++)
        delete [] ArrayOfSeats[r];   // delete each row of seats individually
    delete [] ArrayOfSeats;          // delete the row array
}