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#include <iostream>
#include <fstream>
#include "sales_data.hpp"
/*
*
* 8.8
*
*
* Yes, i stole this function from one of my other projects to be used here.
* I think it works really well here.
*/
int choice (const int mode) {
int FUNCTION_FAILURE = -1;
int MODE_NORMAL = 0;
int MODE_YES = 1;
int MODE_NO = 2;
int MODE_FORCE = 3;
char choice;
char modechoice;
do {
if (mode == MODE_NORMAL) { fputs("[Y / N] ? ", stdout); }
if (mode == MODE_YES) { fputs("[Y / n] ? ", stdout); }
if (mode == MODE_NO) { fputs("[y / N] ? ", stdout); }
if (mode == MODE_FORCE) { return 0; }
choice = getchar();
if (choice == '\n' && mode == MODE_YES) { modechoice = 'Y'; choice = modechoice; goto modeskip;}
if (choice == '\n' && mode == MODE_NO) { modechoice = 'N'; choice = modechoice; goto modeskip;}
if (choice == '\n' && mode == MODE_NORMAL) { continue; }
while ('\n' != getchar());
} while ( (choice != 'Y') && (choice != 'y') && (choice != 'N') && (choice != 'n') );
modeskip:
if ((choice == 'Y') || (choice == 'y')) {
return 0;
}
if ((choice == 'N') || (choice == 'n')) {
return 1;
}
return FUNCTION_FAILURE; // Should never happen
}
int main (int argc, char **argv) {
if(argc < 3 || argc > 4) {
return -1;
}
std::ifstream file(argv[1]); // open first file to read
std::ifstream out_file_chk(argv[2], std::ifstream::ate); // Open 2nd file to check if it exists
if(!out_file_chk.is_open()) { // If it does not exist create it
std::cout << "File created." << std::endl;
std::ofstream create_file(argv[2]);
if(create_file.fail()) { return -1; }
create_file.close();
}
if(file.fail()) { // check if first file failed to open
return -1;
}
if(out_file_chk.tellg() > 0) { // Check if the 2nd file had any data
std::cerr << "This file has data. Do you want to append to it?" << std::endl;
int res = choice(0);
if(res == 1) {
return -1;
}
}
out_file_chk.close();
std::ofstream out_file(argv[2], std::ofstream::app); // Finally open for writing
SalesData total;
if (read(file, total)) {
SalesData trans;
while(read(file, trans)) {
if (total.isbn() == trans.isbn())
total.combine(trans);
else {
print(out_file, total) << std::endl;
total = trans;
}
}
print(out_file, total) << std::endl;
} else {
std::cerr << "No data?!" << std::endl;
}
}
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