cis22c/03-lists/main.cpp

/*
 CIS 22C: Homework 3

 Build and procees a sorted linked list of Park objects.
 The list is sorted in ascending order by the park code.
 Assume that the park code is unique.

 Written by: Iurii Tatishchev
 Reviewed & Modified by: Iurii Tatishchev
 IDE: CLion
 */

/*
 *
    Reads data about National Parks from a text file and inserts them into a sorted linked list. The list is sorted in ascending order by the unique park identifier. For instance, the unique park identifier for the Arches National Park is ARC.
    Displays the list and the number of parks in the list.
    Searches the list: prompts the user to enter a park code (i.e the unique park identifier), searches for that code: if found, displays related data, otherwise displays an error message, then searches again for another code, until the user enter “Q” to stop searching.
    Deletes nodes from the list: prompts the user to enter a code, searches for that code: if found, it removes it from the list, otherwise displays an error message, then searches again for another code, until the user enter “Q” to stop deleting.

    Read and understand this program (draw UML diagrams, the linked list, and hierarchy charts). Then do the following:

    In main.cpp: provide calling statements for the basic linked list functions
        Build and run the program: search will not work, but display and delete should work
    In LinkedList.cpp: finish writing the searchList() function
        Build and run the program: now search should work too
    In Park.h and Park.cpp overload the stream insertion operator. The overloaded operator is going to replace the hDisplay() function in the Park class, and it is going to be used in LinkedList.cpp, in displayList() as shown below
        Build and run the program

 */

#include <iostream>
#include <fstream>
#include <sstream>
#include <string>
#include "LinkedList.h"

using namespace std;

void buildList(const string &filename, LinkedList &list);

void deleteManager(LinkedList &list);

void searchManager(const LinkedList &list);

void displayManager(const LinkedList &list);

int main() {

    string inputFileName = "national_parks.txt";
    LinkedList list;

    buildList(inputFileName, list);
    displayManager(list);
    searchManager(list);
    deleteManager(list);
    displayManager(list);
    return 0;
}

/*
 This function reads data about national parks from a file and inserts them
 into a sorted linked list. The list is sorted in ascending order by code.
*/
void buildList(const string &filename, LinkedList &list) {
    ifstream inputFile(filename);
    cout << "Reading data from \"" << filename << "\"" << endl;

    if (!inputFile) {
        cout << "Error opening the input file: \"" << filename << "\"" << endl;
        exit(EXIT_FAILURE);
    }

    string line;
    while (getline(inputFile, line)) {
        int year;
        string code, name, state, dsc;

        stringstream temp(line);   // create temp with data from line
        temp >> code;              // read from temp
        temp >> state;
        temp >> year;
        temp.ignore();             // to ignore space in front of name
        getline(temp, name, ';');   // stop reading name at ';'
        temp.ignore();             // to ignore space in front of description
        getline(temp, dsc);
        // create a Park object and initialize it with data from file
        Park aPark(code, state, name, dsc, year);
        list.insertNode(aPark);
    }

    inputFile.close();
}

/*
 Delete manager: delete items from the list until the user enters Q to quit
 deleting
 Input Parameter: list
 */
void deleteManager(LinkedList &list) {
    string targetCode = "";

    cout << endl << " Delete" << endl;
    cout << "=======" << endl;

    while (targetCode != "Q") {
        cout << "Enter a park code (or Q to stop deleting):" << endl;
        cin >> targetCode;

        if (targetCode != "Q") {
            if (list.deleteNode(targetCode))
                cout << "    " << targetCode << " has been deleted!" << endl;
            else
                cout << "Park \"" << targetCode << "\" was not found in this list." << endl;
        }
    }
    cout << "___________________END DELETE SECTION_____" << endl;
}

/*
 Search manager: search the list until the user enters Q to quit searching
 Input Parameter: list
 */
void searchManager(const LinkedList &list) {
    string targetCode = "";
    Park aPark;

    cout << endl << " Search" << endl;
    cout << "=======" << endl;

    while (targetCode != "Q") {
        cout << "Enter a park code (or Q to stop searching):" << endl;
        cin >> targetCode;

        if (targetCode != "Q") {
            if (list.searchList(targetCode, aPark))
                aPark.vDisplay();
            else
                cout << "Park \"" << targetCode << "\" was not found in this list." << endl;
        }
    }
    cout << "___________________END SEARCH SECTION _____" << endl;
}

/*
Display manager:
 - displays the number of national parks in this list
 - calls the displayList() function upon request
Input Parameter: list
 */
void displayManager(const LinkedList &list) {
    string action;

    cout << "Number of National Parks in this list: " << list.getLength() << endl;

    cout << "\nDisplay list [Y/N]? ";
    cin >> action;
    if (action == "Y" || action == "y") {
        cout << endl;
        list.displayList();
    }
}