package app;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Scanner;

public class App {

    static void showWarehouse() throws FileNotFoundException {
        File file = new File("products.txt");
        if (file.length() == 0) {
            System.out.println("Plik nie istnieje lub jest pusty. " + "Czy to blad czy to blad, 404?");
        }
        Scanner read = new Scanner(file);
        String line = null;
        String currentProduct = null;
        while (read.hasNextLine()) {
            currentProduct = "";
            line = read.nextLine();
            for (int i = 0; i < line.length(); i++) {
                if (line.charAt(i) != ' ') {
                    currentProduct += line.charAt(i);
                } else {
                    break;
                }
            }
            int quantity = getQuantity(currentProduct);
            int price = getPrice(currentProduct);
            System.out.println("[NAZWA: " + currentProduct + "] [ILOSC: " + quantity + "] [CENA: " + price + "]");
        }
    }

    static boolean productAlreadyExists(String product) throws FileNotFoundException {
        File file = new File("products.txt");
        if (file.length() == 0) {
            return false;
        }
        Scanner read = new Scanner(file);
        String line = null;
        String currentStr = null;
        while (read.hasNextLine()) {
            currentStr = "";
            line = read.nextLine();
            for (int i = 0; i < line.length(); i++) {
                if (line.charAt(i) != ' ') {
                    currentStr += line.charAt(i);
                } else {
                    break;
                }
            }
            if (currentStr.equals(product)) {
                return true;
            }
        }
        return false;
    }

    static boolean lineContainsProduct(String line, String product) {
        String currentStr = "";
        for (int i = 0; i < line.length(); i++) {
            if (line.charAt(i) != ' ') {
                currentStr += line.charAt(i);
            } else {
                if (currentStr.equals(product)) {
                    return true;
                } else {
                    return false;
                }
            }
        }
        return false;
    }

    static int getQuantity(String product) throws FileNotFoundException {
        File file = new File("products.txt");
        if (file.length() == 0) {
            return 0;
        }
        if (productAlreadyExists(product) == false) {
            return 0;
        }
        Scanner read = new Scanner(file);
        String line = null;
        String currentStr = null;
        int quantity = 0;
        String numberStr = null;
        boolean startReading = false;
        while (read.hasNextLine()) {
            currentStr = "";
            line = read.nextLine();
            numberStr = "";
            if (lineContainsProduct(line, product)) {
                for (int i = 0; i < line.length(); i++) {
                    if (startReading) {
                        if (line.charAt(i) == ' ') {
                            break;
                        }
                        numberStr += line.charAt(i);
                    }

                    if (line.charAt(i) == ' ') {
                        startReading = true;
                    }

                }
            }

        }
        if(numberStr.isEmpty()) {
            return 0;
        }
        return Integer.parseInt(numberStr);
    }

    static int getPrice(String product) throws FileNotFoundException {
        int price = 0;
        File file = new File("products.txt");
        if (file.length() == 0) {
            return 0;
        }
        if (productAlreadyExists(product) == false) {
            return 0;
        }
        Scanner read = new Scanner(file);
        String line = null;
        String currentStr = null;
        int quantity = 0;
        String numberStr = null;
        int spaces = 0;
        boolean startReading = false;
        while (read.hasNextLine()) {
            currentStr = "";
            line = read.nextLine();
            numberStr = "";
            if (lineContainsProduct(line, product)) {
                for (int i = 0; i < line.length(); i++) {
                    if (startReading) {
                        if (line.charAt(i) == ' ') {
                            break;
                        }
                        numberStr += line.charAt(i);
                    }

                    if (line.charAt(i) == ' ') {
                        spaces++;
                        if (spaces == 2) {
                            startReading = true;
                        }
                    }

                }
            }

        }
        if(numberStr.isEmpty()) {
            return 0;
        }
        return Integer.parseInt(numberStr);
    }

    static void addProduct(String name, int quantity, int price) throws IOException {
        PrintWriter save = null;
        FileWriter fr = null;
        File file = new File("products.txt");
        if (file.exists() == false) {
            save = new PrintWriter("products.txt");
            save.println(name + " " + quantity + " " + price);
            save.close();
        } else {
            if (productAlreadyExists(name)) {
                quantity = getQuantity(name) + quantity;
                removeProduct(name);
            }
            fr = new FileWriter(file, true);
            fr.write(name + " " + quantity + " " + price + "\n");
            fr.close();
        }

    }

    static void addProduct(String name, int quantity) {

    }

    static void removeProduct(String product) throws FileNotFoundException {
        File file = new File("products.txt");
        if (file.length() == 0) {
            System.out.println("Plik nie istnieje lub jest pusty. " + "Czy to blad czy to blad, 404?");
            return;
        }
        if (productAlreadyExists(product) == false) {
            System.out.println("Nie znaleziono " + product + " w magazynie.");
            return;
        }
        Scanner read = new Scanner(file);
        read = new Scanner(file);
        String line = null;
        int lines = 0;
        while (read.hasNextLine()) {
            lines++;
            read.nextLine();
        }
        String[] products = new String[lines];
        read = new Scanner(file);
        for (int i = 0; i < lines; i++) {
            products[i] = read.nextLine();
        }
        PrintWriter save = new PrintWriter("products.txt");
        for (int i = 0; i < lines; i++) {
            if (lineContainsProduct(products[i], product) == false) {
                save.println(products[i]);
            }

        }
        save.close();
    }

    static void removeProduct(String name, int quantity) throws IOException {
        if (quantity > getQuantity(name)) {
            removeProduct(name);
            return;
        }
        int newQuantity = getQuantity(name) - quantity;
        int price = getPrice(name);
        removeProduct(name);
        addProduct(name, newQuantity, price);

    }

    static void editProduct() throws IOException {
        Scanner sc = new Scanner(System.in);
        File file = new File("products.txt");
        if (file.length() == 0) {
            System.out.println("Plik products.txt nie istnieje");
            return;
        }
        System.out.println("Jaki produkt chcesz edytowac?");
        String name = sc.next();
        if (productAlreadyExists(name) == false) {
            System.out.println("Wybrany produkt nie istnieje");
            return;
        }
        System.out.println("Jaki parametr chcesz edytowac?");
        System.out.println("1 - nazwa");
        System.out.println("2 - cena");
        int key = sc.nextInt();
        switch (key) {
        case 1: {
            editName(name);
            break;
        }
        case 2: {
            editPrice(name);
            break;
        }
        }
    }

    static void editName(String product) throws IOException {
        Scanner sc = new Scanner(System.in);
        System.out.println("Podaj nowa nazwe dla " + product + " :");
        String newName = sc.next();
        int price = getPrice(product);
        int quantity = getQuantity(product);
        removeProduct(product);
        addProduct(newName, quantity, price);
    }

    static void editPrice(String product) throws IOException {
        Scanner sc = new Scanner(System.in);
        System.out.println("Podaj nowa cene dla " + product + " :");
        int newPrice = sc.nextInt();
        int quantity = getQuantity(product);
        removeProduct(product);
        addProduct(product, quantity, newPrice);
    }

    static void showMenu() throws IOException {
        Scanner sc = new Scanner(System.in);
        int key = 0;
        while (true) {
            System.out.println("===========================================");
            System.out.println("= Witaj w Pieronce!                       =");
            System.out.println("= Co chcesz zrobic?                       =");
            System.out.println("= 1. Wypisz co mamy na zapleczu.          =");
            System.out.println("= 2. Dodaj produkt do magazynu.           =");
            System.out.println("= 3. Usun produkt z magazynu.             =");
            System.out.println("= 4. Edytuj produkt.                      =");
            System.out.println("= 5. Opusc sklep w trybie natychmiastowym.=");
            System.out.println("===========================================");
            System.out.println("Twoja decyzja: ");
            key = sc.nextInt();
            switch (key) {
            case 1: {
                showWarehouse();
                break;
            }
            case 2: {
                sc = new Scanner(System.in);
                System.out.println("Podaj nazwe produktu:");
                String name = sc.nextLine();
                System.out.println("Podaj ilosc sztuk: ");
                int quantity = sc.nextInt();
                int price = 0;
                if (productAlreadyExists(name)) {
                    price = getPrice(name);
                } else {
                    System.out.println("Podaj cene (w zl): ");
                    price = sc.nextInt();
                }
                addProduct(name, quantity, price);
                break;
            }
            case 3: {
                sc = new Scanner(System.in);
                System.out.println("Jaki produkt chcesz usunac?");
                String name = sc.next();
                System.out.println("Ile sztuk chcesz usunac?");
                int quantity = sc.nextInt();
                removeProduct(name, quantity);
                break;
            }
            case 4: {
                editProduct();
                break;
            }
            case 5: {
                System.out.println("Zapraszamy ponownie!");
                return;
            }
            case 6: {

            }
            default: {
                System.out.println("Nie ma tutaj takiej opcji. Sproboj ponownie.");
            }
            }
        }
    }

    public static void main(String[] args) throws IOException {
        showMenu();

    }

}