import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class snakeGameView{
    controller controller;

    JFrame window;
    JPanel header;
    JPanel board;
    //tekst som viser score
    JLabel scoreText;
    //knapper for aa starte programmet og avslutte det
    JButton startButton;
    JButton quitButton;

    CellButton[][] cells;

    Thread boardThread;
    // font
    Font tekstFont = new Font("Copperplate Gothic Bold", Font.PLAIN, 30);

    public snakeGameView(controller controller){
        this.controller = controller;

        try{ //setter UI lik uansett hva slags operativsystem man bruker
            UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName());
        } catch(Exception e){
            System.exit(1);
        }

        //setter standard verdier til vinduet
        window = new JFrame("Snake");
        window.setSize(1200, 600);
        window.setLayout(new BorderLayout());
        window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //avslutter programm hvis vi krysser ut vinduet
        cells = new CellButton[controller.getRow()][controller.getCol()];
        boardThread = new Thread(new updateBoard());

        addInfo();
        addCells();

        addKeyBindings();

        window.pack();

        window.setLocationRelativeTo(null);
        window.setVisible(true);
    }

    public class CellButton extends JButton{
        cell cell;
        controller controller;
        int row, col;

        CellButton(int row, int col, controller controller){
            super("");
            cell = controller.getCell(row, col);
            this.controller = controller;
            this.row = row;
            this.col = col;
            this.setBorderPainted(false);
        }

        public void updateColor(){
            if(cell.isSnakeCell){
                int col = controller.getSnake().getHead().getCol();
                int row = controller.getSnake().getHead().getRow();
                if(cell == cells[row][col].cell){
                    cells[row][col].setBackground(new Color(150, 75, 0));
                    return;
                }
                setBackground(Color.PINK);
            }
            else if(cell.isFoodCell){
                setBackground(Color.RED);
            }
            else{
                setBackground(Color.BLACK);
            }
        }
    }

    private void addKeyBindings() {
        InputMap inputMap = window.getRootPane().getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW);
        ActionMap actionMap = window.getRootPane().getActionMap();

        inputMap.put(KeyStroke.getKeyStroke(KeyEvent.VK_UP, 0), "moveUp");
        inputMap.put(KeyStroke.getKeyStroke(KeyEvent.VK_DOWN, 0), "moveDown");
        inputMap.put(KeyStroke.getKeyStroke(KeyEvent.VK_LEFT, 0), "moveLeft");
        inputMap.put(KeyStroke.getKeyStroke(KeyEvent.VK_RIGHT, 0), "moveRight");

        actionMap.put("moveUp", new AbstractAction() {
            @Override
            public void actionPerformed(ActionEvent e) {
                controller.setDirection(2);
            }
        });
        actionMap.put("moveDown", new AbstractAction() {
            @Override
            public void actionPerformed(ActionEvent e) {
                controller.setDirection(-2);
            }
        });
        actionMap.put("moveLeft", new AbstractAction() {
            @Override
            public void actionPerformed(ActionEvent e) {
                controller.setDirection(-1);
            }
        });
        actionMap.put("moveRight", new AbstractAction() {
            @Override
            public void actionPerformed(ActionEvent e) {
                controller.setDirection(1);
            }
        });
    }

    public void addCells(){ //legger til alle cellene
        board = new JPanel();
        board.setLayout(new GridLayout(controller.getRow(), controller.getCol()));
        
        for(int x = 0; x < controller.getRow(); x++){
            for(int y = 0; y < controller.getCol(); y++){
                CellButton CellButton = new CellButton(x, y, controller);
                CellButton.setPreferredSize(new Dimension(30, 30));
                board.add(CellButton);
                cells[x][y] = CellButton;
            }
        }
        window.add(board, BorderLayout.CENTER);
    }

    public void addInfo(){ //hjelpemetode som legger til infoen til programmet, altsaa det overste panelet i vinduet
        header = new JPanel();
        header.setLayout(new FlowLayout());

        //tekst og tekstview                                    
        scoreText = new JLabel("Score: " + controller.getScore());
        scoreText.setFont(tekstFont);
        header.add(scoreText);

        //startButton
        startButton = new JButton("Start");
        startButton.setFont(tekstFont);
        startButton.setBackground(Color.GREEN);
        class StartButton implements ActionListener{
            @Override
            public void actionPerformed(ActionEvent e){
                controller.started = true;
                if (!controller.startedOnce){
                    boardThread.start(); //startButtonen setter igang oppdateringslokken
                    controller.startedOnce = true;
                }
            }
        }
        startButton.addActionListener(new StartButton());
        header.add(startButton);

        //quitButton
        quitButton = new JButton("Avslutt");
        quitButton.setFont(tekstFont);
        quitButton.setBackground(Color.RED);
        class QuitButton implements ActionListener{
            @Override
            public void actionPerformed(ActionEvent e){
                System.exit(1); //avslutt knappen avslutter programmet
            }
        }
        quitButton.addActionListener(new QuitButton());
        header.add(quitButton);

        window.add(header, BorderLayout.NORTH);
    }

    class updateBoard implements Runnable{
        int time = 150;

        @Override
        public void run(){
            try {
                while(controller.started){
                    controller.update();

                    scoreText.setText("Score: " + controller.getScore());

                    for(int x = 0; x < controller.getRow(); x++){
                        for(int y = 0; y < controller.getCol(); y++){
                            cells[x][y].updateColor();
                        }
                    }
                    System.out.println(time);
                    Thread.sleep(time);
                }
            } catch (Exception e) {
                System.out.println("error, noe dumt skjedde :(");
            }
        }
    }
}