import java.util.Scanner;
import java.util.Arrays;
import java.util.Random;

public class SentenceScramble {

	// the main method declares a random and sets an integer to a random value from 0 to 2
	//6 different arrays are declared and assigned sentences with pairs of two that are identical
	//a println statement gives the user instructions on how to play
	//it uses the random integer to determine which sentence is used
	//it sends one sentence to method scrambleArray and then sends the
	//scrambled sentence, original sentence, and corresponding word to method acceptUser

    public static void main(String[] args) {
        Random rand = new Random();
        int determineArr = rand.nextInt(3);

        //declare sentences
        String[] theTrueFirst = {"no ", "one ", "Cares ", "About ", "your ", "feeLings ", "except ", "your ", "moM ", "."};
        String[] theTrueSecond = {"there ", "iS ", "a ", "lot ", "to ", "do ", "In ", "The ", "world ", "."};
        String[] theTrueThird = {"life ", "maY ", "havE ", "no ", "purpose, ", "but ", "neither ", "doeS ","death ", "."};

        String[] theFirst = {"no ", "one ", "Cares ", "About ", "your ", "feeLings ", "except ", "your ", "moM ", "."};
        String[] theSecond = {"there ", "iS ", "a ", "lot ", "to ", "do ", "In ", "The ", "world ", "."};
        String[] theThird = {"life ", "maY ", "havE ", "no ", "purpose, ", "but ", "neither ", "doeS ","death ", "."};

        //give instructions to user
        System.out.println("If you want to see your sentence, input \"LOOK\" \n"
        		+ "If you want to switch words in a sentnce, input \"SWAP int int\"\n"
        		+ "If you want to guess the word, input \"GUESS\" and then input your word\n"
        		+ "Enter \"quit\" if you want to stop\n\n");

        //uses random int to determine which sentence to use and scrambles it
        //then sends it to method acceptUser
        if (determineArr == 0) {
            theFirst = scrambleArray(theFirst);
            acceptUser(theFirst, theTrueFirst, "CALM");

        }else if(determineArr == 1) {
            theSecond = scrambleArray(theSecond);
            acceptUser(theSecond, theTrueSecond, "SIT");

        }else {
            theThird = scrambleArray(theThird);
            acceptUser(theThird, theTrueThird, "YES");

        }

    }
    // scrambles the sentence by randomly swappng array index values 100 times
    public static String[] scrambleArray (String[] newArr) {
        for(int i = 0; i < 100; i++) {
            Random sequence = new Random();
            int swapOne = sequence.nextInt(9);
            int swapTwo = sequence.nextInt(9);
            String tempSavedValue = newArr[swapOne];
            newArr[swapOne] = newArr[swapTwo];
            newArr[swapTwo] = tempSavedValue;
        }
        return newArr;
    }

    //accepts the scrambled sentence, original sentence, and the word the user is trying to find
    //accepts user input for the action the user wants to take so long s they don't enter quit
    public static void acceptUser(String[] sentence, String[] trueSentence, String word) {
        Scanner user = new Scanner (System.in);

        //primes while loop
        String userAction = "nothing";

        while(!userAction.equals("quit")) {
        	//accepts user input and sets it to uppercase
            userAction = user.nextLine();
            userAction = userAction.toUpperCase();

            //if the user inputs look, it prints the sentence
            if(userAction.equals("LOOK")) {
                for(int i = 0; i < sentence.length; i++) {
                    System.out.print(sentence[i]);
                }
                System.out.println("\n");

            //if the user inputs guess, it checks to see if the word is correct
            //it either tells the user they won and stops the loop or tells the user they're wrong
            }else if (userAction.equals("GUESS")) {
                String userGuess = user.nextLine();
                userGuess = userGuess.toUpperCase();
                if(userGuess.equals(word)) {
                    System.out.println("Congrats, you won!");
                    userAction = "quit";

                }else {
                    System.out.println("Nope, try again.\n");
                }

            //if the user didn't type look or guess, it breaks apart the input into substrings
            //substrings are checked to see if they are valid input
            //if they are correct for swap, it swaps the ints and checks if the new sentence is in order
            }else {
                if (userAction.length() == 8) {
                	//breaks into substrings
                    String modAction = userAction.substring(0, 4);
                    String firstSpace = userAction.substring(4, 5);
                    String firstSwap = userAction.substring(5, 6);
                    String secondSpace = userAction.substring(6, 7);
                    String secondSwap = userAction.substring(7, 8);

                    // checks to see if ints are valid by sending substrings to checkSwap method
                    //if they aren't, it tells the user and asks for new input
                    Boolean errorCheck = true;
                    errorCheck = checkSwap(firstSwap, secondSwap);

                if (errorCheck == false) {
                        System.out.println("Error: invalid input\n");
                }else {
                    //checks if their are spaces between the ints
                	if(!firstSpace.equals(" ") || !secondSpace.equals(" ") || !firstSpace.equals(" ") && !secondSpace.equals(" ")) {
                        System.out.println("Error: invalid input\n");
                    }else {
                    	//checks if input equals swap
                        if (modAction.equals("SWAP")) {
                            int intFirstSwap = remade(firstSwap) - 1;
                            int intSecondSwap = remade(secondSwap) - 1;
                            String firstValue = sentence[intFirstSwap];
                            sentence[intFirstSwap] = sentence[intSecondSwap];
                            sentence[intSecondSwap]= firstValue;

                            //checks if new sentence is in order
                            Boolean check = false;
                            if(Arrays.equals(sentence, trueSentence)) {
                                check = true;
                            }

                            if(check.equals(true)) {
                                System.out.println("Congrats! Your Sentence is in order.\n");
                                for(int i = 0; i < sentence.length; i++) {
                                    System.out.print(sentence[i]);
                                }
                                System.out.println("\n");

                            }else {
                            System.out.println("Not quite, swap again.\n");
                            }

                        }else {
                            System.out.println("Error: invalid input\n");
                        }
                    }
                }

                } else {
                    System.out.println("Error: invalid input\n");
                }

            }
            }

    }

    //checks if the ints input as SWAP int int are between 1 and 9
    public static Boolean checkSwap (String firstInt, String secondInt) {
        if ( !firstInt.equals("1") && !firstInt.equals("2") && !firstInt.equals("3") && !firstInt.equals("4") && !firstInt.equals("5") &&
             !firstInt.equals("6") && !firstInt.equals("7") && !firstInt.equals("8") && !firstInt.equals("9")) {
                return false;
        } else if ( !secondInt.equals("1") && !secondInt.equals("2") && !secondInt.equals("3") && !secondInt.equals("4") && !secondInt.equals("5") &&
                    !secondInt.equals("6") && !secondInt.equals("7") && !secondInt.equals("8") && !secondInt.equals("9")) {
                        return false;
        } else {
            return true;
        }
    }

    //turns strings into ints
    public static int remade(String str) {
        int change;
        Scanner look = new Scanner(str);
        change = look.nextInt();
        look.close();
        return change;

    }

}