frequencycalc/Project3/Items.cpp

/*	Cody Cook
    2023/04/13
    CS-210 Project 3
*/
#include "Items.h"

// constructors

// default constructor; parses default file name
Items::Items()
{
    if (!ParseInputFile())
    {
        // try getting a new file
        RequestNewFile();
    }
}

// constructor with a custom input option
Items::Items(string p_inputFile = defaultItemFileName)
{
    SetInputFile(p_inputFile);
    if (!ParseInputFile())
    {
        // try geting a new file
        RequestNewFile();
    }
}

// destructors

// run a set of functions when the class closes
Items::~Items()
{
    if (r_input.is_open())
    {
        r_input.close();
    }
}

// getters

// prints and returns the inventory for a named item
int Items::GetInventory(string p_item)
{
    // search the string in the map
    auto it = r_mapping.find(p_item);

    // if there were results
    if (it != r_mapping.end())
    {
        string times; // allow for more natural responses with the word "time"

        // if there is only one item, it is only there "one time"
        if (it->second == 1)
        {
            times = " time.";
        }
        else
        {
            // if it is 0 or 2 or more, then it is "times"
            times = " times.";
        }

        // output the quantity purchased
        cout << c_red << it->first << c_normal
             << " were purchased ";
        cout << c_red << it->second << c_normal;
        cout << times << endl;
        return it->second;
    }
    else
    {
        // because there wasn't quantity, explain it wasn't purchased.
        cerr << c_red << p_item << c_normal
             << " were not purchased." << endl;
        return 0;
    }
}

// return the string for the inputFile
string Items::GetInputFile()
{
    return r_inputFile;
}

char Items::GetStar()
{
    return r_star;
}

// setters

// update the filename of the input file
void Items::SetInputFile(string p_inputFile)
{
    r_inputFile = p_inputFile;
}

// change the star used in the histogram
void Items::SetStar(char p_star)
{
    r_star = p_star;
}

// methods

// ParseInputFile reads the input file and stores the data in a map; it also runs a backup of the data
bool Items::ParseInputFile()
{
    // try opening the file
    r_input.open(r_inputFile);

    // if the file could not be opened
    if (!r_input.is_open())
    {
        // error out
        cout << "Error opening file "
             << c_red << r_inputFile << c_normal << endl;
        return false;
    }
    clog << endl
         << "Parsing "
         << c_red << r_inputFile << c_normal
         << "... ";

    string line;
    // while we go through each line of the file
    while (getline(r_input, line))
    {
        // Increment the frequency of the current line into the map
        r_mapping[line]++;
    }
    // close the file
    r_input.close();

    // run a backup of this data and return true
    SaveInventory();
    return true;
}

// output the inventory based on the config
void Items::PrintInventory(int p_type)
{
    // find the length of the longest item to help align the output
    size_t longest = 0;
    for (const auto &entry : r_mapping)
    {
        if (entry.first.length() > longest)
        {
            longest = entry.first.length();
        }
    }

    // output the inventory
    for (const auto &entry : r_mapping)
    {
        // output the item name with the longest item name as the width
        cout << setw(longest) << entry.first << " ";

        // see the quantity as a number
        if (p_type == 1)
        {
            cout << c_red << entry.second << c_normal << endl;
        }
        // see the quantity as a histogram
        else if (p_type == 2)
        {
            cout << c_red << string(entry.second, r_star) << c_normal << endl;
        }
    }
}

// SaveInventory creates a backup of the data in the map
bool Items::SaveInventory()
{
    // open file for backup
    ofstream file(r_database);

    // if the file isn't open
    if (!file.is_open())
    {
        // then there was a opening the file; so warn the user and exit the function
        cerr << "Error opening " << c_red << r_database << c_normal << " for backup. Please check your permissions.";
        return false;
    }

    // iterate through the mappings and save them to the file
    for (const auto &entry : r_mapping)
    {
        file << entry.first << " " << entry.second << endl;
    }

    // save and close the file
    file.close();

    // output a successful save and return true
    cout << "Backup file "
         << c_red << r_database << c_normal
         << " updated." << endl;
    cout << endl;
    return true;
}

void Items::RequestNewFile()
{
    string newFile;
    bool moveOn = false;
    while (!moveOn)
    {
        cout << endl;
        cout << "Type " << c_red << "exit" << c_normal << " to quit, or enter the filename to import: ";
        cout << c_red;
        cin >> newFile;
        cout << c_normal;

        if (newFile == "exit")
        {
            exit(0);
        }

        SetInputFile(newFile);

        if (ParseInputFile())
        {
            moveOn = true;
        }
    }
}