package com.company;

import java.io.*;
import java.util.LinkedList;
import java.util.Scanner;
import java.util.ArrayList;

class item implements Serializable {
    String vendorCode;
    String name;
    String cost;
    String quantity;

    void displayInfo() {
        System.out.printf("Vendor Code: %s \tName: %s \tQuantity: %s \t Cost: %s \r\n", vendorCode, name, quantity, cost);
    }

    void displayObjects() {
        System.out.printf("Name: %s\tQuantity: %s\t Cost: %s\r\n", name, quantity, cost);
    }
}

public class Main {

    public static String addVendorCodeFromKeyboard() {
        return inputIndexOfVendorCode() + inputNumOfVendorCode();
    }

    public static String inputIndexOfVendorCode() {
        String str = null;
        boolean isNotCorrect;
        Scanner scan = new Scanner(System.in);
        do {
            System.out.println("Please, input the gender identifier (M - male, F - female, C - Child).");
            isNotCorrect = true;
            str = scan.nextLine().toUpperCase();
            if (str.charAt(0) == 'M' || str.charAt(0) == 'F' || str.charAt(0) == 'C') {
                isNotCorrect = false;
            } else {
                System.out.println("Input data isn't correct. Please, try again.");
            }
        } while (isNotCorrect);
        return str;
    }

    public static String inputNumOfVendorCode() {
        Scanner scanner = new Scanner(System.in);
        int number;
        do {
            System.out.println("Please enter a positive number. ( the length of number might be equal 8).");
            while (!scanner.hasNextInt()) {
                System.out.println("Please, check your value and repeat the input. ");
                scanner.next();
            }
            number = scanner.nextInt();
        } while (String.valueOf(number).length() != 8);
        return String.valueOf(number);
    }

    public static String inputCost() {
        Scanner scanner = new Scanner(System.in);
        float number;
        do {
            System.out.println("Please, enter a price ( value from 0,1 till 1000000).");
            while (!scanner.hasNextFloat()) {
                System.out.println("Please, check your value and repeat the input. ");
                scanner.next();
            }
            number = scanner.nextFloat();
        } while (!(number > 0.099f && number < 1_000_001f));

        return String.valueOf(number);
    }

    public static String inputQuantity() {
        Scanner scanner = new Scanner(System.in);
        int quantity;
        do {
            System.out.println("Please, enter shoes quantity ( from 1 to 1 000 000 000).");
            while (!scanner.hasNextInt()) {
                System.out.println("Please, check your value and repeat the input. ");
                scanner.next();
            }
            quantity = scanner.nextInt();
        } while (!(quantity > 0 && quantity < 1_000_000_001));
        return String.valueOf(quantity);
    }

    public static String inputName() {
        Scanner scanner = new Scanner(System.in);
        String name;
        do {
            System.out.println("Please, input name of shoes. ( The length name of shoes might be from 5 to 15 characters).");
            while (!scanner.hasNext()) {
                System.out.println("The length name of shoes might be from 5 to 15 characters. ");
                scanner.next();
            }
            name = scanner.nextLine();
        } while (!(name.length() > 4 && name.length() < 16));
        return name;
    }


    static void Save(LinkedList<item> Note) {
        Scanner in = new Scanner(System.in);
        boolean IsCorrect;
        Writer writer = null;
        do {
            IsCorrect = true;
            System.out.println("Enter file name:");
            String fileName = in.next();
            try {
                writer = new FileWriter(fileName);
                for (item record : Note) {
                    writer.write(record.vendorCode + "\n" + record.name + "\n" + record.cost + "\n" + record.quantity);
                    writer.write(System.getProperty("line.separator"));
                }
                writer.flush();
                System.out.println("Data saved successfully!");
            } catch (FileNotFoundException e) {
                System.out.println("A file with the same name was not found, try again. ");
                IsCorrect = false;
            } catch (IOException e) {
                System.out.println("File cannot be opened, try again. ");
                IsCorrect = false;
            } catch (NumberFormatException e) {
                System.out.println("Error! File contains invalid data. ");
                IsCorrect = false;
            } finally {
                if (writer != null) {
                    try {
                        writer.close();
                    } catch (IOException ex) {
                        System.out.println("Error");
                    }
                }
            }
        } while (IsCorrect == false);
    }

    public static void showList(LinkedList<item> Note) {
        for (int i = 0; i <= (Note.size() - 1); i++) {
            item Student = Note.get(i);
            System.out.print((i + 1) + "  ");
            Student.displayInfo();
        }
    }

    public static LinkedList<item> addNote(LinkedList<item> Note) {
        item Shoes = new item();
        System.out.println("Enter a vendor code: ");
        Shoes.vendorCode = addVendorCodeFromKeyboard();
        System.out.println("Enter name:");
        Shoes.name = inputName();
        System.out.println("Enter a quantity:");
        Shoes.quantity = inputQuantity();
        System.out.println("Enter cost: ");
        Shoes.cost = inputCost();
        Note.add(Shoes);
        showList(Note);
        return Note;
    }

    static void makeNote(LinkedList<item> note) {
        int choice;
        Scanner in = new Scanner(System.in);
        System.out.println("Choose one of the actions:" + "\r\n1:Add record." + "\r\n2:Save." + "\r\n3:Return to main menu.");
        do {
            while (!in.hasNextInt()) {
                System.out.println("Error! Repeat your input. ");
                in.next();
            }
            choice = in.nextInt();
        } while (!((choice != 1) || (choice != 2) || (choice != 3)));
        switch (choice) {
            case (1):
                System.out.println("Add.");
                note = addNote(note);
                makeNote(note);
                break;
            case (2):
                System.out.println("Save.");
                Save(note);
                note.clear();
                menu();
                break;
            case (3):
                note.clear();
                menu();
                break;
        }
    }

    public static int chooseActionForHelp() {
        int choice = 0;
        boolean isNotCorrect = true;
        Scanner in = new Scanner(System.in);
        while (isNotCorrect) {
            System.out.println("\r\nChoose one of the actions:" + "\r\n1:About program." + "\r\n2:About developer. " + "\r3:Return to main menu.");
            try {
                choice = in.nextInt();
            } catch (Exception e) {
                in.nextLine();
                System.out.println("Error! Repeat your input. ");
            }
            if ((choice == 1) || (choice == 2) || (choice == 3)) {
                isNotCorrect = false;
            }
        }
        return choice;
    }

    static void help() {
        switch (chooseActionForHelp()) {
            case (1):
                System.out.println("Shoe Database. This program can add, edit and delete records. You can also find shoes by article number.");
                menu();
                break;
            case (2):
                System.out.println("Zhenya Trubeko, group 951007");
                menu();
                break;
            case (3):
                menu();
                break;
        }
    }

    static LinkedList<item> readFile() {
        Scanner in = new Scanner(System.in);
        boolean IsCorrect;
        LinkedList<item> note = null;
        do {
            IsCorrect = true;
            System.out.println("Input file name:");
            String fileName = in.next();
            try {
                FileReader fileReader = new FileReader(fileName);
                BufferedReader reader = new BufferedReader(fileReader);
                String line;
                ArrayList<String> all = new ArrayList<String>();
                while ((line = reader.readLine()) != null) {
                    all.add(line);
                }
                note = new LinkedList<>();
                for (int i = 0; i < all.size(); i++)
                    if (i % (item.class.getDeclaredFields().length) == 0) {
                        item readingRecord = new item();
                        readingRecord.vendorCode = all.get(i);
                        readingRecord.name = all.get(i + 1);
                        readingRecord.cost = all.get(i + 2);
                        readingRecord.quantity = all.get(i + 3);
                        note.add(readingRecord);
                    }
            } catch (FileNotFoundException e) {
                System.out.println("A file with the same name was not found, try again");
                IsCorrect = false;
            } catch (IOException e) {
                System.out.println("This file cannot be opened, try again");
                IsCorrect = false;
            } catch (NumberFormatException e) {
                System.out.println("Error! File contains invalid data.");
                IsCorrect = false;
            }
        } while (!IsCorrect);
        return note;
    }

    public static LinkedList<item> lineToChange(LinkedList<item> note) {
        Scanner in = new Scanner(System.in);
        int choice;
        int numberLine;
        System.out.println("Enter the line number you want to change.");
        do {
            while (in.hasNextInt()) {
                System.out.println("Incorrect entry! Re-enter!");
                in.next();
            }
            numberLine = in.nextInt();
        } while (!((numberLine > 0) && (numberLine < note.size() + 1)));
        item shoes = note.get(numberLine - 1);
        shoes.displayInfo();
        System.out.println("Choose one: " + "\r\nVendor code" + "\r\nName" + "\r\nQuantity" + "\r\nCost");
        do {
            while (!in.hasNextInt()) {
                System.out.println("Incorrect entry! Re-enter!");
                in.next();
            }
            choice = in.nextInt();
        } while ((choice != 1) || (choice != 2) || (choice != 3) || (choice != 4));
        changeItem(note, shoes, numberLine, choice);
        return note;
    }

    static void edit(LinkedList<item> Note) {
        Note = readFile();
        showList(Note);
        lineToChange(Note);
        showList(Note);
        Save(Note);
        menu();
    }

    public static LinkedList<item> changeItem(LinkedList<item> Note, item item, int NumberLine, int choice) {
        switch (choice) {
            case (1):
                System.out.println("Vendor Code.");
                System.out.println("Enter new value:");
                item.vendorCode = addVendorCodeFromKeyboard();
                Note.set(NumberLine - 1, item);
                break;
            case (2):
                System.out.println("Name.");
                System.out.println("Enter new value:");
                item.name = inputName();
                Note.set(NumberLine - 1, item);
                break;
            case (3):
                System.out.println("Quantity.");
                System.out.println("Enter new value:");
                item.quantity = inputQuantity();
                Note.set(NumberLine - 1, item);
                break;
            case (4):
                System.out.println("Cost.");
                System.out.println("Enter new value:");
                item.cost = inputCost();
                Note.set(NumberLine - 1, item);
                break;
        }
        return Note;
    }

    static void look(LinkedList<item> Note) {
        Scanner in = new Scanner(System.in);
        Note = readFile();
        showList(Note);
        Note.clear();
        int choice;
        System.out.println("Choose one of the following:" + "\r\n1: View entries." + "\r\n2: To the main menu.");
        do {
            while (!in.hasNextInt()) {
                in.next();
                System.out.println("Incorrect entry! Re-enter!");
            }
            choice = in.nextInt();
        } while (!((choice != 1) || (choice != 2)));
        switch (choice) {
            case (1):
                Note.clear();
                look(Note);
                break;
            case (2):
                Note.clear();
                menu();
                break;
        }
    }

    static void switching(int choice, LinkedList<item> SortList, LinkedList<item> Note, String Symbol) {
        switch (choice) {
            case (1):
                for (int i = 0; i <= (Note.size() - 1); i++) {
                    item Student = Note.get(i);
                    if (Student.quantity.equals(Symbol)) SortList.add(Student);
                }
                break;
        }
        if (SortList.size() > 8) {
            while (SortList.size() > 8) SortList.pollLast();
        }
        showList(SortList);
    }

    public static LinkedList<item> findWomen_sShoes(LinkedList<item> note) {
        LinkedList<item> womensShoes = null;
        ArrayList<String> all = new ArrayList<String>();
        for (int i = 0; i < note.size() - 1; i++) {
            if (note.get(0).vendorCode.charAt(0) == 'F') {
                item product = new item();
                product.vendorCode = all.get(0);
                product.name = all.get(1);
                product.cost = all.get(2);
                product.quantity = all.get(3);
            }

        }
        return womensShoes;
    }

    public static String[] findByArticle(LinkedList<item> note, String vendorCode) {
        String[] all = new String[4];
        for (int i = 0; i < note.size() - 1; i++){
            if (note.get(i).vendorCode == vendorCode) {
                item product = new item();
                product.vendorCode = all[0];
                product.name = all[1];
                product.cost = all[2];
                product.quantity = all[3];
            }
        }
        return all;
    }

    public static void sortWomenShoes(LinkedList<item> note) {
        LinkedList<item> womensShoes = findWomen_sShoes(note);
        item buf = new item();
        boolean isSorted = false;
        while (!isSorted) {
            isSorted = true;
            for (int i = 0; i < womensShoes.size() - 1; i++) {
                if ((womensShoes.get(i).vendorCode.charAt(1)) > (womensShoes.get(i + 1).vendorCode.charAt(1))) {
                    isSorted = false;
                    buf = womensShoes.get(i);
                    womensShoes.set(i, womensShoes.get(i + 1));
                    womensShoes.set(i + 1, buf);
                }

            }
        }
        showList(womensShoes);
    }


    static void find(LinkedList<item> note) {
        int choice;
        System.out.println("Select your search mode:" +
                "\r\n1: Information on the availability and cost of shoes by article."
                + "\r\n2: Sorted assortment list of women's shoes.");
        Scanner in = new Scanner(System.in);
        do {
            while (!in.hasNextInt()) {
                System.out.println("Error! Repeat entry.");
                in.next();
            }
            choice = in.nextInt();
        } while (!(choice == 1 || choice == 2));
        switch (choice) {
            case (1):
                findByArticle(note, addVendorCodeFromKeyboard());
                break;
            case (2):
                sortWomenShoes(note);
                break;
        }
        LinkedList<item> sortList = new LinkedList<>();
        System.out.println("Choose one of the following:" + "\r\n1: Go to search." + "\r\n2: Save." + "\r\n3: To the main menu.");
        do {
            while (!in.hasNextInt()) {
                System.out.println("Error! Repeat entry.");
                in.next();
            }
            choice = in.nextInt();
        } while (!(choice == 1 || choice == 2 || choice == 3));
        switch (choice) {
            case (1):
                note.clear();
                sortList.clear();
                find(note);
                break;
            case (2):
                Save(sortList);
                note.clear();
                sortList.clear();
                menu();
                break;
            case (3):
                note.clear();
                sortList.clear();
                menu();
                break;
        }
    }

    public static int chooseAction() {
        int selection;
        Scanner in = new Scanner(System.in);
        do {
            while (!in.hasNextInt()) {
                System.out.println("Incorrect entry! Re-enter!");
                in.next();
            }
            selection = in.nextInt();
        } while (!(selection > 0 && selection < 7));
        return selection;
    }

    public static void menu() {
        System.out.println("\r\nChoose one of the actions:" + "\r\n1:Create." + "\r\n2:View" + "\r\n3:Find." +
                "\r\n4:Edit." + "\r\n5:Help." + "\r\n6:Exit.");
        LinkedList<item> note = new LinkedList<>();
        switch (chooseAction()) {
            case (1):
                System.out.println("Create.");
                makeNote(note);
                break;
            case (2):
                System.out.println("View.");
                look(note);
                break;
            case (3):
                System.out.println("Find.");
                find(note);
                break;
            case (4):
                System.out.println("Edit.");
                edit(note);
                break;
            case (5):
                System.out.println("Help.");
                help();
                break;
            case (6):
                System.out.println("Exit.");
                System.exit(0);
                break;
        }
    }

    public static void main(String[] args) {
        menu();
    }
}