/**
 * This class holds information about a record. 
 * i.e, will have name, address, city state, zip code, phone number
 * 
 * This class assumes that records will be in following format.
 * 
 * |Name
 * |Address
 * |City, ST ZIP
 * |Phone
 * 
 * ST = Short name  (2 chars) State    
 * ZIP = 5 Number zip code.
 */
public class DataRecord
{
    /**
     * Individual Name
     */
    private String name = "";
 
    /**
     * Individual Address
     */
    private String address = "";
 
    /**
     * Individual City
     */
    private String city = "";
 
    /**
     * Individual State
     */
    private String state = "";
 
    /**
     * Individual Zip
     */
    private String zip = "";
 
    /**
     * Individual Phone
     */
    private String phone = "";
 
    /**
     * Constructor which initializes the record.
     * @param String line1     First line of record from the file.
     * @param String line2     Second line.
     * @param String line3     Third line.
     * @param String line4     Fourth line.
     */
    public DataRecord(String line1, String line2, String line3, String line4)
    {
        setName(line1);
        setAddress(line2);
        setCityStateZip(line3);
        setPhone(line4);
    }
 
    /**
     * Parse the line 3 to set City state and zip code.
     * @param String line3 third line of record as reaad from data file. 
     */     
    public void setCityStateZip(String line3)
    {
        int index = line3.indexOf(',');
 
        if (index < 1)
        {
            throw new RuntimeException("Invalid Record. comma not found." +
                "Expected: \"city,ST ZIP\". " +
                "Got: " + line3);
        }
 
        String tmpLine = line3.substring(index+1).trim();
        if ((tmpLine.length() < 5) || 
           (tmpLine.charAt(2) != ' '))
        {
            throw new RuntimeException("Invalid Record. " +
                "Expected: \"city,ST ZIP\". " +
                "Got: " + line3);
        }
 
        setCity(line3.substring(0, index));
        setState(tmpLine.substring(0,2));
        setZip(tmpLine.substring(4));        
    }
 
    /**
     * Returns the Individual's city.
     * @return String, city. 
     */
    public String getCity()
    {
        return city;
    }
 
    /**
     * Returns the Individual's name.
     * @return String, name. 
     */
    public String getName()
    {
        return name;
    }
 
    /**
     * Returns the Individual's Phone number.
     * @return String, phone number. 
     */
    public String getPhone()
    {
        return phone;
    }
 
    /**
     * Returns the Individual's state.
     * @return String, state. 
     */
    public String getState()
    {
        return state;
    }
 
    /**
     * Returns the Individual's zip code.
     * @return String, Zip code. 
     */
    public String getZip()
    {
        return zip;
    }
 
    /**
     * Sets the Individual's city.
     * @param String string     city. 
     */
    public void setCity(String string)
    {
        city = string;
    }
 
    /**
     * Sets the Individual's name.
     * @param String string     name. 
     */
    public void setName(String string)
    {
        name = string;
    }
 
    /**
     * Sets the Individual's phone.
     * @param String string     phone. 
     */
    public void setPhone(String string)
    {
        phone = string;
    }
 
    /**
     * Sets the Individual's state.
     * @param String string     state 
     */
    public void setState(String string)
    {
        state = string;
    }
 
    /**
     * Sets the Individual's zip code.
     * @param String string     Zip code. 
     */
    public void setZip(String string)
    {
        zip = string;
    }
 
    /**
     * @return String, User Address
     */
    public String getAddress()
    {
        return address;
    }
 
    /**
     * @param String address    UserAddress 
     */
    public void setAddress(String address)
    {
        this.address = address;
    }
 
    /**
     * Gives String representation of this record.
     * @return String, represntation of this record.
     */    
    public String toString()
    {
        StringBuffer result = new StringBuffer();
        /*
        result.append("Name:" + getName() + "; " );
        result.append("Address:" + getAddress() + "; " );
        result.append("City:" + getCity() + "; " );
        result.append("State:" + getState() + "; " );
        result.append("Zip:" + getZip() + "; " );
        result.append("Phone:" + getPhone());
        */
        result.append(getName() + "; " );
        result.append(getAddress() + "; " );
        result.append(getCity() + "; " );
        result.append(getState() + "; " );
        result.append(getZip() + "; " );
        result.append(getPhone());
        return result.toString();        
    }
 
}

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
 
/**
 * This is the main class. It controls the user menus, take user inputs, 
 * reads the data file and manages the subgroups.
 * It also maintains subgroups selected by the user. 
 */
public class MList
{
 
    /**
     * Reader to read user inputs from command line.
     */
    private BufferedReader in = null;
 
    /**
     * Root/first node of the linked list which holds the Data Records. 
     */
    private List individuals = null;
 
    /**
     * This list will contain the subgroups selcted by the user. 
     */
    private List subGroups = new ArrayList();
 
    /**
     * Initializes the reader. 
     */
    private void init()
    {
        in = new BufferedReader(new InputStreamReader(System.in));
        System.out.println("At any given point of time enter \"EXIT\" to exit the application.");
    }
 
    /**
     * gets file name from the user & then read the data  
     */
    private void readfile()
    {
        while (true)
        {
            System.out.print("Please enter the path and name of Data File: ");
            try
            {
                String fileName = getLine();
                readfile(fileName);
                break;
            }
            catch (IOException e)
            {
                System.out.println("Please enter a valid file name. ");
            }
        }
    }
 
 
    /**
     * Reads the data file.
     * @param String fileName   Filename of the data file as provided by user.
     * @throws IOException  
     */
    private void readfile(String fileName)throws IOException
    {
        BufferedReader reader = new BufferedReader(
                                        new InputStreamReader(
                                                new FileInputStream(fileName)));
 
        String line1 = null; 
        String line2 = null;
        String line3 = null;
        String line4 = null;
        String blankLine = null;
 
        individuals = new ArrayList();      
        while(true)
        {
            //Read first line of the record.
            line1 = reader.readLine();
            if (line1 == null)
            {
                break;
            }
            //Read Sec line of the record.
            line2 = reader.readLine();
            if (line2 == null)
            {
                System.out.println("WARNING: Incomplete record at the end of the file.");
                break;
            }
 
            //Read third line of the record.
            line3 = reader.readLine();
            if (line3 == null)
            {
                System.out.println("WARNING: Incomplete record at the end of the file.");
                break;
            }
            //Read fourth line of the record.
            line4 = reader.readLine();
            if (line4 == null)
            {
                System.out.println("WARNING: Incomplete record at the end of the file.");
                break;
            }
            //create a record.
            DataRecord rec = new DataRecord(line1,line2,line3,line4);
            individuals.add(rec);
            //System.out.println(rec);
            //Read blank line.
            blankLine = reader.readLine();
            if (blankLine == null)
            {
                break;
            }
        }
    }
 
    /**
     * Reads the information enterd by the user on console. It also stops 
     * the program if user enters exit.
     * @return  String, the line entered by the user.
     * @throws IOException
     */
    private String getLine() throws IOException
    {
        String line = in.readLine();
        if ("EXIT".equalsIgnoreCase(line))
        {
            System.exit(0);
        }
        return line;
    }
 
    /**
     * Start method which manages the follow.
     */    
    private void start() throws IOException
    {
        readfile();
        manageSubGroups();                    
    }
 
    /**
     * Prints subgroup menu
     *
     */
    private void printSubGroupMenu()
    {
        System.out.println("Please select your choice of the SubGroup by field: ");
        System.out.println("1. SubGroup by matching name");
        System.out.println("2. SubGroup by matching Address");
        System.out.println("3. SubGroup by City");
        System.out.println("4. SubGroup by State");
        System.out.println("5. SubGroup by ZipCode");
        System.out.println("6. SubGroup by Phone Area Code(first 3 digits)");
        System.out.println("7. SubGroup by matching phone number");
        System.out.println("8. Print selected SubGroups");
        System.out.println("0. Exit");
        System.out.print("Please enter your choice:");
    }
 
    /**
     * This method Manages Subgroups, prints menu, takes user input and 
     * then prints the summary.
     */
    private void manageSubGroups() throws IOException
    {
        String choice = "";
        int iChoice = -1; 
        String criteria = "";
        String msg = "";
        subGroups = new ArrayList();
        while(!"0".equals(choice))
        {
            printSubGroupMenu();
            choice = getLine();
            if ("1".equals(choice))
            {
                //Matching name       
                iChoice = 1;  
                System.out.print("Enter matching name: ");           
                msg = "Individuals with matching name";                
            }
            else if ("2".equals(choice))
            {
                //matching address
                iChoice = 2;                             
                System.out.print("Enter matching Address: ");                           
                msg = "Individuals with matching Address";                
            }
            else if ("3".equals(choice))
            {
                //matching city
                iChoice = 3;                             
                System.out.print("Enter City starting with: ");                           
                msg = "Individuals with in the specified City";                
            }
            else if ("4".equals(choice))
            {
                //matching state
                iChoice = 4;                             
                System.out.print("Enter State starting with (2 letters): ");                           
                msg = "Individuals with in the specified state";                
            }
            else if ("5".equals(choice))
            {
                //matching zip 
                iChoice = 5;                             
                System.out.print("Enter matching Zip Code: ");                           
                msg = "Individuals with matching Zip code";                
            }
            else if ("6".equals(choice))
            {
                //matching area code
                iChoice = 6;                             
                System.out.print("Enter Phone area code starting with (3 digits): ");                           
                msg = "Individuals with matching Area code";                
            }
            else if ("7".equals(choice))
            {
                //matching phone number
                iChoice = 7;                             
                System.out.print("Enter matching phone number: ");                           
                msg = "Individuals with matching Phone";                
            }
            else if ("8".equals(choice))
            {
                //print all the selected subGroups
                printsubList(subGroups);
                break;
            }
            else if ("0".equals(choice))
            {
                return;
            }
            else
            {
                System.out.println("Invalid choice. Please enter again a Valid choice.");
                continue;
            }
            criteria = getLine();
 
            prepareSubList(iChoice, criteria, msg);
        }
    }
 
    /**
     * Prints all the details of the subgroups selcted by users and the 
     * correspondings sublists.
     * @param List userSubGroups    List of user subgroups    
     */
    private void printsubList(List userSubGroups)
    {
        for(int i = 0 ; i < subGroups.size(); i++)
        {
            ((SubGroup)userSubGroups.get(i)).print();                      
        }
    }
 
    /**
     * Adds the subgroup selected by the user, prepares the subList associated 
     * with the user selected sub group. 
     * @param int iChoice           User Choice
     * @param String criteria       SubGroup selection criteria
     * @param String msg            Message to be printed
     */
    private void prepareSubList(int iChoice, 
                            String criteria, String msg)
    {
        SubGroupSelector selector = getSelector(iChoice, criteria);
        SubGroup subGroup = new SubGroup(iChoice, criteria, msg);
 
        for(int i = 0 ; i < individuals.size(); i++)
        {
            DataRecord rec = (DataRecord)individuals.get(i);
            if (selector.isEligibleForSubGroup(rec))
            {
                subGroup.addIndividual(rec);
            }
        }
        subGroups.add(subGroup);        
    }
 
    /**
     * This method creates and returns appropriate selector based on 
     * user choice.
     * @param int iChoice User choice.
     * @param String criteria   Criteria String to used for selection  
     * @return  SubGroupSelector, based on user choice.
     */
    private SubGroupSelector getSelector(int iChoice, String criteria)
    {
        switch(iChoice)
        {
            case 1: return new SelectorByName(criteria);
            case 2: return new SelectorByAddress(criteria); 
            case 3: return new SelectorByCity(criteria);
            case 4: return new SelectorByState(criteria);
            case 5: return new SelectorByZip(criteria);
            case 6: return new SelectorByAreaCode(criteria);
            case 7: return new SelectorByPhone(criteria);
        }
        return null;
    }
 
    /**
     * Main method as called by the JVM. 
     * @param args
     */
    public static void main(String[] args)
    {
        MList mlist = new MList();
        try
        {
            mlist.init();
            mlist.start();
        }
        catch(Exception e)
        {
            System.out.println("**** ERROR ****");
            System.out.println(e);
        }
    }
 
}