import java.util.ArrayList;

/**
 *
 */
public class TextOutput {
    private boolean formatRaw;
    private int columnWidth = 20;

    /**
     * Method which checks in which way the paragraphs should be displayed. And then calls the corresponding
     * method to output the text as desired.
     *
     * @param text the ArrayList which is then formatted into the desired output.
     */
    public void print(ArrayList<String> text) {
        if(text.size() == 0) {
            errorMissingText();
        }
        else if (formatRaw) {
            printFormated(text);
        } else {
            toFormat(text);
        }
    }

    /**
     * Method to print out the paragraphs in numerical order and with the whole paragraph as its length.
     *
     * @param text the ArrayList which is used for the output
     */
    private void printFormated(ArrayList<String> text) {
        for (int counter = 0; counter < text.size(); counter++) {
            System.out.println("<" + (counter + 1) + ">: <" + text.get(counter) + ">");
        }

    }

    /**
     * Method to print out the paragraphs with the length taken from columnWidth and adding leftover words to the next
     * paragraph.
     *
     * @param text the ArrayList which is used for the output.
     */
    private void toFormat(ArrayList<String> text) {
        for (String paragraph : text) {
            int currentLength = 0;
            String[] words = paragraph.split(" ");
            int lastWordNumber = words.length;
            int currentWordNumber = 0;
            for(String word : words) {
                currentWordNumber++;
                if (word.length()<= columnWidth - currentLength) {
                    System.out.print(word);
                }
                else {
                    if(currentWordNumber != 1) {
                        System.out.println();
                        currentLength = 0;
                    }
                    System.out.print(word);

                }
                if(!(currentWordNumber == lastWordNumber)) {
                    System.out.print(" ");
                    currentLength = currentLength + word.length() + 1;
                }
                else {
                    System.out.println();
                }
            }
        }
    }

    /**
     * Method which sets the Variable formatRaw to true.
     *
     * @return true to indicate that it was successful.
     */
    public boolean formatRaw() {
        formatRaw = true;
        return true;
    }

    /**
     * Method to set the formatRaw to false and also set the length of the desired paragraph length in order to limit
     * the paragraph length when printing the text.
     *
     * @param length the paragraph length when printing the text.
     * @return returns true if successful and false if and invalid length has been submitted.
     */
    public boolean formatFix(int length) {
        if(length > 0) {
            formatRaw = false;
            columnWidth = length;
            return true;
        }
        else {
            return false;
        }
    }

    /**
     * Method which outputs user information.
     *
     * @param info User information received as a String.
     */
    public void userInfoOutput(String info) {
        System.out.println(info);
    }

    /**
     * Outputs the index that contains words with corresponding paragraphs.
     *
     * @param index ArrayList with words and in which part they have
     */
    public void indexOutput(ArrayList<String> index) {
        if(index.size() == 0) {
            errorMissingText();
        }
        else {
            for (String word : index) {
                System.out.println(word);
            }
        }
    }

    /**
     * Method to give out the Error "Invalid Paragraph".
     */
    public void errorInvalidParagraph() {
        System.err.println("Invalid Paragraph");
    }

    /**
     * Method to give out the Error "Invalid Command".
     */
    public void errorInvalidCommand() {
        System.err.println("Invalid Command");
    }

    /**
     * Method to give out the Error "Missing Text".
     */
    public void errorMissingText() {
        System.err.println("Missing Text");
    }
}