bands.cs (fixed)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;

class BattleReader
{

    // /path/to/file
    static string path      = "bands.txt";
    // Formatting information. Used in more than one method.
    static string spacer    = "{0,-20}";
    // Separator.
    static char sep         = ',';

    static void Main ()
    {
        // Menu Choice.
        int mc = ChkFile(path);

        while (mc != 4)
        {
            string[] menu = {
                "Main menu:",
                "\n\t1. View all band entries.",
                "\t2. Search for a specific band by name or total votes.",
                "\t4. Exit."
            };

            Console.Clear();
            for (int i = 0; i < menu.Length; i++)
                Console.WriteLine(menu[i]);
                mc = ParseInteger("\nSelection: ");

            switch (mc)
            {
                case 1:
                    // View all records.
                    DataInterface(-1);
                    break;
                case 2:
                    // Search for a record.
                    SearchInterface();
                    break;
                default:
                    break;
            }
        }
    }

    // Check if the file exists.
    static int ChkFile(string path)
    {
        // I will expand on this later. Right now I just want to gracefully fail if the file isn't there.
        int mc = 42;

        if (!File.Exists(path))
        {
            mc = 4;
            ChkFileErr();
        }

        return mc;
    }

    // Parse input.
    static int ParseInteger(string query)
    {
        bool parse      = false;
        int parsedInt   = 0;

        do
        {
            Console.Write(query);
            parse = Int32.TryParse(Console.ReadLine(), out parsedInt);

            if (!parse)
                ParseErr();

        } while(!parse);

        return parsedInt;
    }

    // Load a file.
    static string[] LoadDataFile(string path)
    {
        // This doesn't *have* to be a standalone method, but doing this
        // leaves me open for future improvements.
        string[] data = File.ReadAllLines(path);
        return data;
    }

    // Viewer.
    static void DataInterface(int rec)
    {
        // Grab data.
        string[] data   = LoadDataFile(path);

        Console.Clear();

        // Print all lines.
        if (rec == -1)
        {
            PrintHeader();
            for (int i = 0; i < data.Length; i++)
                PrintRecord(data[i]);
            PrintAverageVotes();
            PrintTopBand();
        }
        // Print a specific line.
        else if (rec >= 0)
        {
            PrintHeader();
            PrintRecord(data[rec]);
        }

        GoBack();
    }

    // These next methods handle one specific aspect of printing.
    // These are "quality of life" methods.
    static void PrintHeader()
    {
        int cols        = CountCols(path);
        // Formatting material.
        string[] header = { "Band name:", "Total votes:", "Star rating:" };
        string divider  = "---------------";

        // Header.
        for (int i = 0; i < cols; i++)
            Console.Write(String.Format(spacer, header[i]));
            Console.WriteLine();
        for (int i = 0; i < cols; i++)
            Console.Write(String.Format(spacer, divider));
            Console.WriteLine();
    }

    // Print the specified line.
    static void PrintRecord(string line)
    {
        // Take one line in, split it, print it.
        string[] row    = line.Split(sep);
        int cols        = CountCols(path);

        for (int i = 1; i < cols; i++)
            Console.Write(String.Format(spacer, row[i]));
            Console.Write(String.Format(spacer, BandStars(row[2])));
            Console.WriteLine();
    }

    // Print /only/ the band name.
    static string PrintBandName(string line)
    {
        string[] row    = line.Split(sep);
        string bandName = row[1];
        return bandName;
    }

    // Print /only/ the band's votes.
    static string PrintBandVotes(string line)
    {
        string[] row    = line.Split(sep);
        string bandVotes = row[2];
        return bandVotes;
    }

    static void PrintAverageVotes()
    {
        Console.WriteLine("\nAverage votes per band: {0}", CalculateAverageVotes());
    }

    //Search.
    static int Search(string query)
    {
        string[] data   = LoadDataFile(path);
        int rec     = 0;
        int sentinel    = -1;

        do
        {
            // sentinel changes to -1 if string isn't matched.
            sentinel = data[rec].IndexOf(query);
            if ( sentinel >= 0 )
                break;
            rec++;

        } while (rec < data.Length);

        // 0 or above: found.
        // -1 not found.
        if (sentinel < 0)
            rec = -1;

        return rec;
    }

    static void SearchInterface()
    {
        string query = null;
        int record;

        Console.Clear();
        Console.Write("String to search for (case-sensitive): ");
            query = Convert.ToString(Console.ReadLine());

        record = Search(query);

        if (record < 0)
            StringNotMatched();
        else if (record >= 0)
            StringMatched(record);
    }

    static void StringNotMatched()
    {
        Console.WriteLine("\nString not matched.");
        GoBack();
    }

    static void StringMatched(int rec)
    {
        Console.WriteLine("\nString matched!");
        DataInterface(rec);
    }

    static void PrintTopBand()
    {
        Console.WriteLine("\nTop band (most votes): {0}", TopBand());
    }

    static string TopBand()
    {
        string[] data   = LoadDataFile(path);
        string[] names  = new string[data.Length];
        int[] votes     = new int[data.Length];
        string[] line;
        int topVotes;
        string topBand;
        string topBandQuery;

        for (int i = 0; i < data.Length; i++)
        {
            // 1. Split the record into votes and names.
            line = data[i].Split(sep);
            names[i] = line[1];
            votes[i] = Convert.ToInt32(line[2]);
        }

        // 2. Find the largest number in the votes array.
        topVotes = votes.Max();
        // 3. Convert this number back into a string.
        topBandQuery = Convert.ToString(topVotes);
        // 4. Search for this string in the main array.
        topVotes = Search(topBandQuery);
        // 5. With our element number in hand, we use it to recover the name of the band.
        topBand = names[topVotes];

        return topBand;
    }

    // Vote "stars".
    static string BandStars(string votes)
    {
        int voteCnt      = Convert.ToInt32(votes);
        string[] stars   = {"*","**","***","****"};
        string voteStars = "";

        if (voteCnt < 100)
            voteStars = stars[0];
        else if ((voteCnt >= 100) && (voteCnt <= 299))
            voteStars = stars[1];
        else if ((voteCnt >= 300) && (voteCnt <= 499))
            voteStars = stars[2];
        else if (voteCnt > 499)
            voteStars = stars[3];

        return voteStars;
    }

    // Average votes.
    static double CalculateAverageVotes()
    {
        string[] data   = LoadDataFile(path);
        double[] num    = new double[data.Length];
        double average  = 0;
        string[] record;

        for (int i = 0; i < (data.Length - 1); i++)
        {
            record = data[i].Split(sep);
            num[i] = Convert.ToDouble(record[2]);
        }

        average = num.Average();

        return average;
    }

    // Enumerate fields in a row.
    static int CountCols(string path)
    {
        string[] data   = LoadDataFile(path);
        string[] line   = data[0].Split(sep);
        int fields      = line.Length;
        return fields;
    }

    // Go back.
    static void GoBack()
    {
        Console.WriteLine("\nPress [RETURN] to continue. ");
        Console.ReadLine();
    }

    // +++++ERRORS++++
    static void ParseErr()
    {
        Console.WriteLine("\nPlease input a valid number!");
    }

    static void ChkFileErr()
    {
        Console.WriteLine("\nFatal error: File {0} not found!\n", path);
    }

    static void SearchErr()
    {
        Console.WriteLine("\nString not matched!");
    }
}