proj2 source

main.cpp

// Author: Nicholas Fazzolari
// Date: 1/22/16
// Assignment: Song data base application
// Sources: Text Book, cplusplus.com

#include <iostream>
#include <iomanip>
#include <cstring>
#include <fstream>

using namespace std;

const int CHAR_ARR_MAX = 256;

// struct to hold the song data components (make this a class)
struct Song
{
	char title[CHAR_ARR_MAX];
	char artist[CHAR_ARR_MAX];
	char length[CHAR_ARR_MAX];
	char album[CHAR_ARR_MAX];
};

// function prototypes (move to header file for class based version)

// file operations
void loadFile(const char inputFile[], Song list[], int& listLength);
void saveFile(const char inputFile[], const Song list[], int listLength);

// user functions
void usrMenu(char selection, Song list[], int& listLength);
void printSongs(const Song list[], int listLength);
bool searchSongsByAlbum(const char search[], const Song list[], int listLength);
bool searchSongsByArtist(const char search[], const Song list[], int listLength);
void removeSong(Song list[], int& listLength);

// utility functions
void usrEntries(const Song& songEntry, Song list[], int& listLength);
void readInput(Song& songEntry);
void getInput(const char inputMsg[], char input[], int arr_size);

int main() {
	// locals
	Song listLength[CHAR_ARR_MAX];
	char inFile[CHAR_ARR_MAX];
	int songIds;
	char userSelection;

	cout << endl << "Enter path/name to datafile: ";
	cin >> inFile;
	loadFile(inFile, listLength, songIds);

	// user interface
	do {
		cout << endl
			<< "MAKE A SELECTION: " << endl
			<< "[1] Print Songs" << endl
			<< "[2] Add Entry" << endl
			<< "[3] Remove Song (use index number)" << endl
			<< "[4] Search by Artist" << endl
			<< "[6] Search by Album" << endl
			<< "(When done enter 'q' to quit)" << endl
			<< "Please make a menu selection: ";

		cin >> userSelection;
		cin.ignore(100, '\n');

		// parse the user input
		usrMenu(userSelection, listLength, songIds);

	} while (userSelection != 'q');

	// call saveFile function
	saveFile(inFile, listLength, songIds);

	return 0;
}

// this function loads the file for manipulation
void loadFile(const char inputFile[], Song list[], int& listLength) {
	// locals
	ifstream inFile;
	Song songEntry;
	char fileTitle[CHAR_ARR_MAX];
	char fileArtist[CHAR_ARR_MAX];
	char fileLength[CHAR_ARR_MAX];
	char fileAlbum[CHAR_ARR_MAX];

	// open user file
	inFile.open(inputFile);

	if (!inFile) {
		inFile.clear();

		cout << "invalid input file" << endl;

		return;
	}

	inFile.get(fileTitle, CHAR_ARR_MAX, '-');

	while (!inFile.eof()) {
		inFile.get();
		inFile.get(fileArtist, CHAR_ARR_MAX, '-');

		inFile.get();
		inFile.get(fileLength, CHAR_ARR_MAX, '-');

		inFile.get();
		inFile.get(fileAlbum, CHAR_ARR_MAX, '-');
		inFile.get();

		inFile.ignore(1000, '\n');

		// add data to struct
		strcpy(songEntry.title, fileTitle);
		strcpy(songEntry.artist, fileArtist);
		strcpy(songEntry.length, fileLength);
		strcpy(songEntry.album, fileAlbum);

		usrEntries(songEntry, list, listLength);

		inFile.get(fileTitle, CHAR_ARR_MAX, '-');
	}

	inFile.close();

}

// this function saves the file
void saveFile(const char inputFile[], const Song list[], int listLength) {
	// locals
	ofstream outFile;
	int i;

	outFile.open(inputFile);

	// error handling for data files
	if (!outFile) {
		cout << "invalid file" << endl;
		outFile.clear();

		return;
	}


	for (i = 0; i < listLength; i++) {
		outFile << list[i].title << "-" << list[i].artist << "-" << list[i].length << "-" << list[i].album << "-" << endl;
	}

	outFile.close();
}

// this function handles the UI logic
void usrMenu(char menuChoice, Song list[], int& listLength) {
	// locals
	Song newEntry;
	char search[CHAR_ARR_MAX];

	// switch for user selections
	switch (menuChoice) {
	case '1':
		printSongs(list, listLength);
		break;
	case '2':
		readInput(newEntry);
		usrEntries(newEntry, list, listLength);
		printSongs(list, listLength);
		break;
	case '3':
		removeSong(list, listLength);
		break;
	case '4':
		getInput("Enter the artist name: ", search, CHAR_ARR_MAX);
		searchSongsByArtist(search, list, listLength);
		break;
	case '5':
		getInput("Enter the album name: ", search, CHAR_ARR_MAX);
		searchSongsByAlbum(search, list, listLength);
		break;
	case 'q':
		cout << "Shutting down!" << endl;
		break;
	default:
		cout << "Invalid input" << endl;
		break;
	}
}

// this functions prints out the songs
void printSongs(const Song list[], int listLength) {
	// locals
	int i;

	cout << setw(17) << left << "Title" << setw(22) << left << "Artist" << setw(10) << left << "Length" << setw(22) << left << "Album" << endl;

	for (i = 0; i < listLength; i++) {
		if (i < 10) {
			cout << i << setw(16) << right << list[i].title << setw(22) << right << list[i].artist << setw(10) << right << list[i].length << setw(22) << right << list[i].album << endl;
		}
		else {
			cout << i << setw(17) << right << list[i].title << setw(22) << right << list[i].artist << setw(10) << right << list[i].length << setw(22) << right << list[i].album << endl;
		}
	}
	cout << "There are " << listLength << " in the database." << endl;
}

// this functions searches for the songs by album
bool searchSongsByAlbum(const char searchArr[], const Song list[], int listLength) {
	// locals
	int i;
	bool searchGood = false;

	cout << "Search songs by Album title: " << endl;

	cout << setw(20) << "Title" << setw(20) << "Artist" << setw(20) << "Length" << setw(20) << "Album" << endl;
	// the search algo
	for (i = 0; i < listLength; i++) {
		if (strcmp(searchArr, list[i].album) == 0) {
			cout << i << setw(20) << list[i].title << setw(20) << list[i].artist << setw(20) << list[i].length << setw(20) << list[i].album << endl;
			searchGood = true;
		}
	}

	if (searchGood == false) {
		cout << "Could not find album in your database, try again." << endl;
	}
	return searchGood;
}
// this function searches for the songs by artist
bool searchSongsByArtist(const char searchArr[], const Song list[], int listLength) {
	// locals
	int i;
	bool searchGood = false;

	cout << "Search songs by artist: " << endl;

	cout << setw(20) << "Title" << setw(20) << "Artist" << setw(20) << "Length" << setw(20) << "Album" << endl;
	// the search algo
	for (i = 0; i < listLength; i++) {
		if (strcmp(searchArr, list[i].artist) == 0) {
			cout << i << setw(20) << list[i].title << setw(20) << list[i].artist << setw(20) << list[i].length << setw(20) << list[i].album << endl;
			searchGood = true;
		}
	}

	// if the search fails ask: 
	if (searchGood == false) {
		cout << "Could not find artist in your database, try again." << endl;
	}

	return searchGood;
}
// this functions allows you to remove songs
void removeSong(Song list[], int& listLength) {
	// locals
	int usrIndex;

	cout << "Enter the index of the song you want to delete: " << endl;
	cin >> usrIndex;

	// handle invalid input range (move to function?)
	if (usrIndex < 0 || usrIndex >= listLength) {
		cout << "Invalid Input" << endl;
		return;
	} else {
		if (usrIndex == listLength - 1) {
			listLength = listLength - 1;
		} else {
			strcpy(list[usrIndex].title, list[listLength - 1].title);
			strcpy(list[usrIndex].artist, list[listLength - 1].artist);
			strcpy(list[usrIndex].length, list[listLength - 1].length);
			strcpy(list[usrIndex].album, list[listLength - 1].album);
			listLength = listLength - 1;
		}
	}
	// show new listLength after deletion
	printSongs(list, listLength);
}

// this is the entries function for adding the data to the array struct
void usrEntries(const Song& songEntry, Song list[], int& listLength) {
	strcpy(list[listLength].title, songEntry.title);
	strcpy(list[listLength].artist, songEntry.artist);
	strcpy(list[listLength].length, songEntry.length);
	strcpy(list[listLength].album, songEntry.album);
	listLength++;
}

// this function reads in the database entries
void readInput(Song& songEntry) {
	//variable declaration
	char entryTitle[CHAR_ARR_MAX];
	char entryArtist[CHAR_ARR_MAX];
	char entryLength[CHAR_ARR_MAX];
	char entryAlbum[CHAR_ARR_MAX];

	getInput("Enter song title: ", entryTitle, CHAR_ARR_MAX);
	getInput("Enter song artist: ", entryArtist, CHAR_ARR_MAX);
	getInput("Enter song length: ", entryLength, CHAR_ARR_MAX);
	getInput("Enter song album: ", entryAlbum, CHAR_ARR_MAX);

	// add the data to the struct
	strcpy(songEntry.title, entryTitle);
	strcpy(songEntry.artist, entryArtist);
	strcpy(songEntry.length, entryLength);
	strcpy(songEntry.album, entryAlbum);
}

// this function defines the new input
void getInput(const char inputMsg[], char input[], int arrLength) {
	// print questions for user
	cout << endl << inputMsg;
	cin.get(input, arrLength, '\n');
	while (!cin) {
		cin.clear();
		cin.ignore(100, '\n');
		cout << endl << inputMsg;
		cin.get(input, arrLength, '\n');
	}

	cin.ignore(100, '\n');
}