import java.util.TreeMap;
import java.util.Map;
import java.util.ArrayList;
import java.util.Scanner;

/**
 * Created by Rachelle
 */
public class PhoneBook {
    Map<String,Entry> phonebook = new TreeMap<String,Entry>();
    Scanner scanner = new Scanner(System.in);
    public PhoneBook(){       

    }

    public void main(){       
        System.out.println("Welcome!"); 
        boolean runningProgram = true;
        while(runningProgram){
            System.out.println("\nSelect an option from the menu.\n"
                + "(Add): to add a new entry or to an existing entry\n(Lookup): to lookup a number\n"
                + "(Reverse): to perform a reverse lookup\n(Display) to print phonebook\n"
                + "(Delete): to remove a record or a phone number\n(Exit): to exit the phonebook");
            switch(getUserInputNormalized()){
                case "add": 
                addEntry(getNameFromUser(),getNumberFromUser());
                break;

                case "lookup":
                String name = getNameFromUser();
                if(hasEntry(name)){
                    System.out.println("\n" + name + ": " + lookupNumber(name));   
                }else{
                    System.out.println("\n**Name not found**");
                }
                continueMessage();
                break;

                case "reverse":
                String phoneNumber = getNumberFromUser();
                if(reverseLookup(phoneNumber).equals("no match")){
                    System.out.println("\n**Number not found.**");
                }else{
                    System.out.println("This is " + reverseLookup(phoneNumber) + "'s number.");
                }
                continueMessage();
                break;

                case "display":
                if(phonebook.isEmpty()){
                    System.out.println("\n**Nothing to display. Please add an entry first.**");   
                }else{
                    System.out.println(displayPhonebook());
                }
                continueMessage();
                break;

                case "delete":
                deleteRecordOrNumberPrompt();
                break;

                case "exit": runningProgram = false;
                break;

                default: System.out.println("\n**Command not found.**\n");
                break;
            }
        }
    }

    //Input
    public String getUserInputNormalized(){
        Scanner scanner = new Scanner(System.in);
        return scanner.nextLine().toLowerCase().trim();
    }

    public String getNumberFromUser(){
        System.out.println("Enter phone number.");
        return scanner.nextLine();
    }

    public String getNameFromUser(){
        System.out.println("Enter name.");
        return scanner.nextLine();
    }

    //Additions
    public void addEntry(String name, String phoneNumber){
        if(hasEntry(name)){
            duplicateEntry(name, phoneNumber);
        }else{
            Entry newEntry = new Entry(phoneNumber);
            phonebook.put(name,newEntry);
            recordUpdatedMessage(name, phoneNumber);
        }
    }

    public boolean hasEntry(String name){
        return phonebook.containsKey(name);
    }

    public void duplicateEntry(String name, String phoneNumber){
        boolean duplicateError = false;
        do{    
            System.out.println("\nDuplicate name found. Add to existing entry? (y/n). Enter (exit) to go back.");
            String userInput = getUserInputNormalized();
            if(userInput.equals("n")||userInput.equals("no")){
                addEntry(getNameFromUser(),phoneNumber);
            }else if(userInput.equals("y")||userInput.equals("yes")){
                addAdditionalNumbers(name, phoneNumber);
            }else if(userInput.equals("exit")){
                break;
            }else{
                System.out.println("\n**Command not recognized.**\n");
                duplicateError = true;
            }
        }while(duplicateError);
    }

    public void addAdditionalNumbers(String name, String phoneNumber){
        boolean duplicateNumber = false;
        do{
            if(getEntry(name).entryArrayContainsNumber(phoneNumber)){
                System.out.println("\nThis phone number is already listed for " + name + ". Enter a new number or enter (exit) to go back.");
                System.out.println("Record found: " + displayRecord(name));
                String userInput = getUserInputNormalized();
                if(getEntry(name).entryArrayContainsNumber(userInput)){
                    duplicateNumber = true;
                }else if(!userInput.equals("exit")){
                    getEntry(name).addPhoneNumber(userInput);
                    recordUpdatedMessage(name,userInput);
                    duplicateNumber = false;
                }
            }else{
                getEntry(name).addPhoneNumber(phoneNumber);
                recordUpdatedMessage(name, phoneNumber);
            }
        }while(duplicateNumber);
    }

    public Entry getEntry(String name){
        return phonebook.get(name);
    }

    //Lookups
    public String lookupNumber(String name){
        Entry entryToLookUp = phonebook.get(name);
        return entryToLookUp.getPhoneNumber();
    }

    public String reverseLookup(String number){
        String nameForAGivenNumber = "no match";
        for(String name: phonebook.keySet()){
            Entry entry = phonebook.get(name);
            String phoneNumber = entry.getPhoneNumber();
            if (phoneNumber.equals(number)){
                nameForAGivenNumber = name;
            }
        }
        return nameForAGivenNumber;
    }

    //Deletion
    public void deleteRecordOrNumberPrompt(){
        boolean error = false;
        do{
            if(phonebook.size()<=0){
                System.out.println("\n**No records to delete.**\n");
                break;
            }else{
                System.out.println("\nRemove an entire (record) or remove a phone (number)? Enter (exit) to go back.");
                String userInput = getUserInputNormalized();
                if(userInput.equals("record")){
                    removeRecord();
                }else if(userInput.equals("number")){
                    removeNumber();
                }else if(userInput.equals("exit")){
                    break;
                }else{
                    System.out.println("\n**Command not recognized.**");
                    error = true;
                }
            }
        }while(error);
    }

    public void removeRecord(){
        String recordToRemove = getNameFromUser();
        if(hasEntry(recordToRemove)){
            confirmRemoveEntry(recordToRemove);
        }else{
            System.out.println("\n**Name not found.**\n");
        }
    }

    public void  confirmRemoveEntry(String name){
        boolean continueWithDelete = true;
        while(continueWithDelete){  
            System.out.println("\n" + displayRecord(name) + "\nContinue with deleting this listing? (y/n)");
            String userInput = getUserInputNormalized();
            if(userInput.equals("n")||userInput.equals("no")){
                System.out.println("\n**Delete cancelled.**\n");
                continueWithDelete = false;
            }else if(userInput.equals("y")||userInput.equals("yes")){
                removeEntry(name);
                continueWithDelete = false;
            }else{
                System.out.println("\n**Command not recognized.**");
            }
        }
    }

    public void removeEntry(String name){
        phonebook.remove(name);
        System.out.println("\n**" + name + " deleted.**\n");
    }

    public void removeNumber(){
        String name = getNameFromUser();
        if(hasEntry(name) && getEntry(name).getNumberOfRecords()>1){
            deleteWhereMultipleEntries(name);
        }else if(hasEntry(name) && getEntry(name).getNumberOfRecords()==1){
            deleteWhereSingleEntry(name);
        }else{
            System.out.println("\n**Name not found.**\n");
        }
    }

    public void deleteWhereMultipleEntries(String name){
        System.out.println("\nPhone numbers listed for: " + displayRecord(name));
        String phoneNumber = getNumberFromUser();
        getEntry(name).removePhoneNumber(phoneNumber);
        System.out.println("\n**Deleted " + phoneNumber + ".**\n**Record updated to: " + displayRecord(name) + ".**");
        continueMessage();
    }

    public void deleteWhereSingleEntry(String name){
        System.out.println("\nThere is only one number listed for " + displayRecord(name) + ".");
        boolean continueToPrompt = true;
        while(continueToPrompt){
            System.out.println("Continue with deleting this record? (y/n)");
            String userInput = getUserInputNormalized();
            if(userInput.equals("n")||userInput.equals("no")){
                System.out.println("\n**Delete cancelled.**\n");
                continueToPrompt = false;
            }else if(userInput.equals("y")||userInput.equals("yes")){
                removeEntry(name);
                continueToPrompt = false;
            }else{
                System.out.println("\n**Command not recognized.**\n");
            }
        }
    }

    //Display
    public String displayPhonebook(){
        StringBuilder stringToDisplay = new StringBuilder();
        stringToDisplay.append("\n**Listings:**\n");
        for(String name: phonebook.keySet()){
            Entry entry = phonebook.get(name);
            String phoneNumber = entry.getPhoneNumber();
            stringToDisplay.append(name + ": " + phoneNumber + "\n");
        }
        return stringToDisplay.toString();
    }

    public String displayRecord(String name){
        StringBuilder stringToDisplay = new StringBuilder();
        String phoneNumber = phonebook.get(name).getPhoneNumber();
        stringToDisplay.append(name + ": " + phoneNumber);
        return stringToDisplay.toString();
    }

    //Messaging
    public void continueMessage(){
        System.out.println("Press enter to continue.");
        scanner.nextLine();
    }

    public void recordUpdatedMessage(String name, String phoneNumber){
        System.out.println("\n**" + phoneNumber + " added to " + name + "**\n");
    }
}