#include <iostream>
#include <fstream>
#include <stdlib.h>
#include <string.h>
#include <iomanip>                          // Brandon Poling
using namespace std;                        // Comp-1102 Project 3b

void getFile(char fileName[]);
void menuDisplay();
void processMenuChoice(char choice, char fileName[]);
void printDetailedReport(char fileName[]);
void printExceptionReport(char fileName[]);
void printSummaryReport(char fileName[]);
void printDescription(char fileName[]);
void printColumnHeadings();
void getInfoFromFile(ifstream& dataFile, char stockNumber[], char description[], float& cost, float& price, int& quantity);
void trimSpaces(char str[]);
void formatLines(ifstream& dataFile, char stockNumber[], char description[], float& cost, float& price, int& quantity, int& count);


int main()
{
    ifstream dataFile;
    char choice;
    char fileName[30];
    getFile(fileName);
    menuDisplay();
    cin >> choice;
    cin.ignore();

    while ( (choice != 'E') && (choice != 'e'))
    {
        processMenuChoice(choice, fileName);
        menuDisplay();
        cin >> choice;
        cin.ignore();
    }
}

void getFile(char fileName[])
{
    ifstream dataFile;
    do
    {
        cout << "\n\nEnter name of file: ";
        cin.getline(fileName, 30, '\n');

        if (strcmp(fileName, "") == 0)
        {
            exit(1);
            //strcat(fileName, "stock.txt");
        }

        dataFile.open(fileName);
        if (dataFile.fail())
        {
            cout << "\nError in opening file.";
        }
    }
    while (dataFile.fail());
}

void menuDisplay()
{
        cout << "\nA. Detail Report";
        cout << "\nB. Exception Report";
        cout << "\nC. Summary Report";
        cout << "\nD. Display Description of Item";
        cout << "\nE. Exit";
        cout << "\n\nEnter a choice: ";
}

void processMenuChoice(char choice, char fileName[])
{
    if (choice == 'A' || choice == 'a')
    {
        printDetailedReport(fileName);
    }

    else if (choice == 'B' || choice == 'b')
    {
        printExceptionReport(fileName);
    }

    else if (choice == 'C' || choice == 'c')
    {
        printSummaryReport(fileName);
    }

    else if (choice == 'D' || choice == 'd')
    {
        printDescription(fileName);
    }

    else
    {
        cout << "\nYou entered an invalid choice." << endl;
    }
}

void printDetailedReport(char fileName[])
{
    ifstream dataFile;
    char stockNumber[6];
    char description[20];
    float cost;
    float price;
    int quantity;
    int count;

    dataFile.open(fileName);
    if(dataFile.fail())
    {
        cout << "Error in opening file " << fileName << endl;
        cout << "\n\nEnter name of file: ";
        cin.getline(fileName, 30, '\n');
    }

    system("CLS");
    count = 0;

    printColumnHeadings();
    while (!dataFile.eof())
    {
        count++;
        if (count > 10)
        {
            count = 1;
            system("PAUSE");
            cout << endl;
            printColumnHeadings();
        }
        getInfoFromFile(dataFile, stockNumber, description, cost, price, quantity);
        if (strcmp(stockNumber, "") != 0)
        {
        formatLines(dataFile, stockNumber, description, cost, price, quantity, count);
        }
    }

    dataFile.close();
}

void printExceptionReport(char fileName[])
{
    ifstream dataFile;
    char stockNumber[6];
    char description[20];
    float cost;
    float price;
    int quantity;
    int count;
    int minimum;

    dataFile.open(fileName);
    while (dataFile.fail())
    {
        cout << "Error in opening file " << fileName << endl;
        cout << "\n\nEnter name of file: ";
        cin.getline(fileName, 30, '\n');
        dataFile.open(fileName);
    }

    cout << "Enter minimum quantity of stock: ";
    cin >> minimum;
    system("CLS");

    count = 0;
    printColumnHeadings();
    while (!dataFile.eof())
    {
        getInfoFromFile(dataFile, stockNumber, description, cost, price, quantity);

        if ((quantity < minimum) && (strcmp(stockNumber, "") != 0))
        {
            count++;
            formatLines(dataFile, stockNumber, description, cost, price, quantity, count);
        }
    }
    if (count == 0)    // If count wasn't incremented, no stock below the user's minimum
    {
        cout << "\n--------------------------No Stock Below Your Minimum-----------------------\n\n";
    }
    dataFile.close();
}

void printSummaryReport(char fileName[])
{
    ifstream dataFile;
    char stockNumber[6];
    char description[20];
    float cost;
    float price;
    int quantity;
    float temp;
    float largest;
    char largestStockNum[6];
    char largestDesc[20];
    float secondLargest;
    char secLargestStockNum[6];
    char secLargestDesc[20];

    dataFile.open(fileName);
    while (dataFile.fail())
    {
        cout << "Error in opening file " << fileName << endl;
        cout << "\n\nEnter name of file: ";
        cin.getline(fileName, 30, '\n');
        dataFile.open(fileName);
    }

    system("CLS");
    largest = 0;
    secondLargest = 0;

    while (!dataFile.eof())
    {
        getInfoFromFile(dataFile, stockNumber, description, cost, price, quantity);
        temp = (price - cost) * quantity;

        if (temp > largest)
        {
            secondLargest = largest;
            strcpy(secLargestStockNum, largestStockNum);
            strcpy(secLargestDesc, largestDesc);

            largest = temp;
            strcpy(largestStockNum, stockNumber);
            strcpy(largestDesc, description);
        }

        else if ((temp > secondLargest) && (temp < largest))
        {
            secondLargest = temp;
            strcpy(secLargestStockNum, stockNumber);
            strcpy(secLargestDesc, description);
        }

    }

    cout << "Largest Profit Potential" << endl;
    cout << "Stock Number: " << largestStockNum << endl;
    cout << "Description: " << largestDesc << endl;
    cout << endl;
    cout << "Second Largest Profit Potential" << endl;
    cout << "Stock Number: " << secLargestStockNum << endl;
    cout << "Description: " << secLargestDesc << endl;

}
    ifstream dataFile;

void printDescription(char fileName[])
{
    ifstream dataFile;
    char stockNumber[6];
    char description[20];
    float cost;
    float price;
    int quantity;
    char userStockNum[6];
    bool found;

    dataFile.open(fileName);
    while (dataFile.fail())
    {
        cout << "Error in opening file " << fileName << endl;
        cout << "\n\nEnter name of file: ";
        cin.getline(fileName, 30, '\n');
        dataFile.open(fileName);
    }

    cout << "Enter a stock number: ";
    cin.getline(userStockNum, 6);

    system("CLS");
    found = false;
    while(!dataFile.eof())
    {
        getInfoFromFile(dataFile, stockNumber, description, cost, price, quantity);
        if ((strcmp(userStockNum, stockNumber) == 0) && (strcmp(stockNumber, "") != 0))
        {
            cout << "Match! Description: " << description << endl;
            found = true;
        }
    }

    if (found == false)
    {
        cout << "\nCouldn't find specified stock number.\n\n";
    }


}

void printColumnHeadings()
{
    cout.unsetf(ios::left);
    cout << setiosflags(ios::right) << setw(7) << "Line" << " ";
    cout.unsetf(ios::right);
    cout << setiosflags(ios::left) << setw(9) << "Stock#" << setw(22) << "Description";
    cout.unsetf(ios::left);
    cout << setiosflags(ios::fixed) << setiosflags(ios::right) <<
    setw(12) << "Cost" << setw(12)<< "Price" << setw(12) << "Quantity" << endl;
}

void getInfoFromFile(ifstream& dataFile, char stockNumber[], char description[], float& cost, float& price, int& quantity)
{
    dataFile.get(stockNumber, 6);
    trimSpaces(stockNumber);
    dataFile.get(description, 20);
    trimSpaces(description);
    dataFile >> cost >> price >> quantity;
    dataFile.ignore(99, '\n');
}
void trimSpaces(char str[])
{
    int n;
    bool done;

    n = strlen(str) - 1;
    done = false;
    while (!done)
    {
        if (n < 0)
        {
            done = true;
        }
        else if (str[n] != 32) // 32 = space character
        {
            done = true;
        }
        else
        {
        n--;
        }
    }
    str[n+1] = '\0';
}

void formatLines(ifstream& dataFile, char stockNumber[], char description[], float& cost, float& price, int& quantity, int& count)
{
    cout.unsetf(ios::left);
    cout << setiosflags(ios::right) << setw(7) << count << ") ";
    cout.unsetf(ios::right);
    cout << setiosflags(ios::left) << setw(9) << stockNumber << setw(22) << description;
    cout.unsetf(ios::left);
    cout << setiosflags(ios::fixed) << setiosflags(ios::right) << setprecision(2) <<
    setw(12) << cost << setw(12)<< price << setw(12) << quantity << endl;
}