package flashcards;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.IOException;
import java.util.*;


public class Main {
    static Map<String, String> myCards = new LinkedHashMap<>();
    static String fileName;
    static List <String> stringTerAndDef = new ArrayList<>();
    static List <String> termin = new ArrayList<>();
    static List <String> definition = new ArrayList<>();

    static String input(){
        Scanner scanner = new Scanner(System.in);
        String input = scanner.nextLine();
        return input;
    }
    static void remove() throws IOException {
        System.out.println("The card");
        String remove = input();
        if (myCards.containsKey(remove)){
            myCards.remove(remove);
            System.out.println("The card has been removed.");
        } else {
            System.out.println("Can't remove \"" + remove + "\": there is no such card.");
        }
        action();
    }
    static void imPORT() throws IOException {
        System.out.println("File name:");
        fileName = "C:\\Users\\pleti\\Desktop\\" + input();
        File file = new File(fileName);
        try (Scanner scanner = new Scanner(file)) {
            int ind = 0;
            while (scanner.hasNext()) {
                String allString = scanner.nextLine();
                stringTerAndDef.add(allString);
            }
            int i = 0;
            int y = 0;
            while (i < stringTerAndDef.size()) {
                if (i % 2 == 0) {
                    termin.add(stringTerAndDef.get(i));
                }
                if (i % 2 != 0) {
                    definition.add(stringTerAndDef.get(i));
                }
                i++;
            }
            while (y < termin.size()){
                if (!myCards.containsKey(termin.get(y))){
                    myCards.put(termin.get(y), definition.get(y));
                    ind++;
                } else {
                    myCards.put(termin.get(y), definition.get(y));
                    ind++;
                }
                y++;
            }
            System.out.println(ind + " cards have been saved.");
            action();
        } catch (FileNotFoundException e) {
            System.out.println("No file found: " + fileName);
            action();
        }
    }
    static void export() throws IOException {
        System.out.println("File name:");
        String newFile = "C:\\Users\\pleti\\Desktop\\" + input();
        File file = new File(newFile);
        FileWriter writer = new FileWriter(file);
        int ind = 0;
        for (Map.Entry<String, String> product : myCards.entrySet()) {
            writer.write(product.getKey() + "\n");
            writer.write(product.getValue() + "\n");
            ind++;
        }
        System.out.println(ind + " cards have been loaded.");
        writer.close();
        action();
    }
    static void ask() throws IOException {
        Random random = new Random();
        System.out.println("How many times to ask?");
        int randomInt = Integer.parseInt(input());
        List <String> keys = new ArrayList<>(myCards.keySet());
        List <String> value = new ArrayList<>(myCards.values());
        int x = 0;
        while (x < randomInt) {
            String ranKey = keys.get(random.nextInt(keys.size()));
            System.out.println("Print the definition of \"" + ranKey + "\":");
            String answer = input();
            if (answer.equals(myCards.get(ranKey))){
                System.out.println("Correct answer");
                x++;
            } else{
                int indexKey = value.indexOf(answer);
                int correctAnswerIndex = keys.indexOf(ranKey);
                if (value.contains(answer)){

                    System.out.println("Wrong answer. " +
                            "The correct one is \"" + value.get(correctAnswerIndex) +"\", you've just written the " +
                            "definition of \"" + keys.get(indexKey) + "\".");
                    x++;
                } else {
                    System.out.println("Wrong answer. The correct one is \"" + value.get(correctAnswerIndex) +"\".");
                    x++;
                }
            }
        }
        action();
    }
    static void exit(){
        System.out.println("Bye bye!");
    }
    static void action() throws IOException {
        System.out.println("Input the action (add, remove, import, export, ask, exit):");
        String action = input().toLowerCase();
        switch (action){
            case "add":
                add();
                break;
            case "remove":
                remove();
                break;
            case "import":
                imPORT();
                break;
            case "export":
                export();
                break;
            case "ask":
                ask();
                break;
            case "exit":
                exit();
                break;
            default:
                System.out.println("Incorect input");
                action();
        }
    }

    static void add() throws IOException {
        System.out.println("The card:");
        String ter = input();
        if (myCards.containsKey(ter)){
            System.out.println("The card \""+ ter + "\" already exists.");
        }
        System.out.println("The definition of the card:");
        String def = input();
        if (myCards.containsValue(def)){
            System.out.println("The definition \""+ def +"\" already exists.");
        }
        myCards.put(ter, def);
        System.out.println("The pair (\""+ ter + "\":\""+ def +"\") has been added.");
        action();
    }
    public static void main(String[] args) throws IOException {
        action();
    }
}