package net.minecraft;

import javax.crypto.Cipher;
import javax.crypto.CipherInputStream;
import javax.crypto.CipherOutputStream;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.PBEParameterSpec;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.image.VolatileImage;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.URL;
import java.util.Random;

public class LoginForm extends Panel {
	private static final long serialVersionUID = 1L;
	private final TextField userName = new TextField(20);
	private final Image bgImage;
	private final TextField password = new TextField(20);
	private final Checkbox rememberBox = new Checkbox("Remember password");
	private final Button launchButton = new Button("Login");
	private final Button retryButton = new Button("Try again");
	private final Button offlineButton = new Button("Play offline");
	private final Label errorLabel = new Label("", 1);
	private final LauncherFrame launcherFrame;
	private boolean outdated = false;
	private VolatileImage img;

	public LoginForm(final LauncherFrame launcherFrame) {
		Image bgImage1;
		this.launcherFrame = launcherFrame;

		GridBagLayout gbl = new GridBagLayout();
		setLayout(gbl);

		add(buildLoginPanel());

		bgImage1 = null;
		try {
			bgImage1 = ImageIO.read(LoginForm.class.getResource("dirt.png")).getScaledInstance(32, 32, 16);
		} catch (IOException e) {
			e.printStackTrace();
		}

		this.bgImage = bgImage1;
		readUsername();

		this.retryButton.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent ae) {
				LoginForm.this.errorLabel.setText("");
				LoginForm.this.removeAll();
				LoginForm.this.add(LoginForm.this.buildLoginPanel());
				LoginForm.this.validate();
			}
		});

		this.offlineButton.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent ae) {
				launcherFrame.playCached(LoginForm.this.userName.getText());
			}
		});

		this.launchButton.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent ae) {
				launcherFrame.login(LoginForm.this.userName.getText(), LoginForm.this.password.getText());
			}
		});
	}

	private void readUsername() {
		try {
			DataInputStream dis;
			File lastLogin = new File(Util.getWorkingDirectory(), "lastlogin");

			Cipher cipher = getCipher(2, "passwordfile");
			if (cipher != null) {
				dis = new DataInputStream(new CipherInputStream(new FileInputStream(lastLogin), cipher));
			} else {
				dis = new DataInputStream(new FileInputStream(lastLogin));
			}
			this.userName.setText(dis.readUTF());
			this.password.setText(dis.readUTF());
			this.rememberBox.setState((this.password.getText().length() > 0));
			dis.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	private void writeUsername() {
		try {
			DataOutputStream dos;
			File lastLogin = new File(Util.getWorkingDirectory(), "lastlogin");

			Cipher cipher = getCipher(1, "passwordfile");
			if (cipher != null) {
				dos = new DataOutputStream(new CipherOutputStream(new FileOutputStream(lastLogin), cipher));
			} else {
				dos = new DataOutputStream(new FileOutputStream(lastLogin));
			}
			dos.writeUTF(this.userName.getText());
			dos.writeUTF(this.rememberBox.getState() ? this.password.getText() : "");
			dos.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	private Cipher getCipher(int mode, String password) throws Exception {
		Random random = new Random(43287234L);
		byte[] salt = new byte[8];
		random.nextBytes(salt);
		PBEParameterSpec pbeParamSpec = new PBEParameterSpec(salt, 5);

		SecretKey pbeKey = SecretKeyFactory.getInstance("PBEWithMD5AndDES").generateSecret(new PBEKeySpec(password.toCharArray()));
		Cipher cipher = Cipher.getInstance("PBEWithMD5AndDES");
		cipher.init(mode, pbeKey, pbeParamSpec);
		return cipher;
	}

	public void update(Graphics g) {
		paint(g);
	}


	public void paint(Graphics g2) {
		int w = getWidth() / 2;
		int h = getHeight() / 2;
		if (this.img == null || this.img.getWidth() != w || this.img.getHeight() != h) {
			this.img = createVolatileImage(w, h);
		}

		Graphics g = this.img.getGraphics();
		for (int x = 0; x <= w / 32; x++) {
			for (int y = 0; y <= h / 32; y++)
				g.drawImage(this.bgImage, x * 32, y * 32, null);
		}
		g.setColor(Color.LIGHT_GRAY);


		String msg = "Minecraft Launcher";
		g.setFont(new Font(null, 1, 20));
		FontMetrics fm = g.getFontMetrics();
		g.drawString(msg, w / 2 - fm.stringWidth(msg) / 2, h / 2 - fm.getHeight() * 2);

		g.dispose();
		g2.drawImage(this.img, 0, 0, w * 2, h * 2, null);
	}

	private Panel buildLoginPanel() {
		Panel panel = new Panel() {
			private static final long serialVersionUID = 1L;
			private final Insets insets = new Insets(12, 24, 16, 32);

			public Insets getInsets() {
				return this.insets;
			}

			public void update(Graphics g) {
				paint(g);
			}

			public void paint(Graphics g) {
				super.paint(g);
				int hOffs = 0;

				g.setColor(Color.BLACK);
				g.drawRect(0, hOffs, getWidth() - 1, getHeight() - 1 - hOffs);
				g.drawRect(1, 1 + hOffs, getWidth() - 3, getHeight() - 3 - hOffs);
				g.setColor(Color.WHITE);

				g.drawRect(2, 2 + hOffs, getWidth() - 5, getHeight() - 5 - hOffs);
			}
		};

		panel.setBackground(Color.GRAY);
		BorderLayout layout = new BorderLayout();
		layout.setHgap(0);
		layout.setVgap(8);
		panel.setLayout(layout);


		GridLayout gl1 = new GridLayout(0, 1);
		GridLayout gl2 = new GridLayout(0, 1);
		gl1.setVgap(2);
		gl2.setVgap(2);
		Panel titles = new Panel(gl1);
		Panel values = new Panel(gl2);

		titles.add(new Label("Username:", 2));
		titles.add(new Label("Password:", 2));
		titles.add(new Label("", 2));

		this.password.setEchoChar('*');
		values.add(this.userName);
		values.add(this.password);
		values.add(this.rememberBox);

		panel.add(titles, "West");
		panel.add(values, "Center");

		Panel loginPanel = new Panel(new BorderLayout());

		Panel registerPanel = new Panel(new BorderLayout());
		try {
			if (this.outdated) {
				Label accountLink = new Label("You need to update the launcher!") {
					private static final long serialVersionUID = 0L;

					public void paint(Graphics g) {
						super.paint(g);

						int x = 0;
						int y = 0;


						FontMetrics fm = g.getFontMetrics();
						int width = fm.stringWidth(getText());
						int height = fm.getHeight();

						if (getAlignment() == 0) {
							x = 0;
						} else if (getAlignment() == 1) {
							x = (getBounds()).width / 2 - width / 2;
						} else if (getAlignment() == 2) {
							x = (getBounds()).width - width;
						}
						y = (getBounds()).height / 2 + height / 2 - 1;

						g.drawLine(x + 2, y, x + width - 2, y);
					}

					public void update(Graphics g) {
						paint(g);
					}
				};

				accountLink.setCursor(Cursor.getPredefinedCursor(12));
				accountLink.addMouseListener(new MouseAdapter() {
					public void mousePressed(MouseEvent arg0) {
						try {
							Desktop.getDesktop().browse((new URL("http://www.minecraft.net/download.jsp")).toURI());
						} catch (Exception e) {
							e.printStackTrace();
						}
					}
				});
				accountLink.setForeground(Color.BLUE);
				registerPanel.add(accountLink, "West");
				registerPanel.add(new Panel(), "Center");
			} else {
				Label accountLink = new Label("Need account?") {
					private static final long serialVersionUID = 0L;

					public void paint(Graphics g) {
						super.paint(g);

						int x = 0;
						int y = 0;


						FontMetrics fm = g.getFontMetrics();
						int width = fm.stringWidth(getText());
						int height = fm.getHeight();

						if (getAlignment() == 0) {
							x = 0;
						} else if (getAlignment() == 1) {
							x = (getBounds()).width / 2 - width / 2;
						} else if (getAlignment() == 2) {
							x = (getBounds()).width - width;
						}
						y = (getBounds()).height / 2 + height / 2 - 1;

						g.drawLine(x + 2, y, x + width - 2, y);
					}

					public void update(Graphics g) {
						paint(g);
					}
				};

				accountLink.setCursor(Cursor.getPredefinedCursor(12));
				accountLink.addMouseListener(new MouseAdapter() {
					public void mousePressed(MouseEvent arg0) {
						try {
							Desktop.getDesktop().browse((new URL("http://www.minecraft.net/register.jsp")).toURI());
						} catch (Exception e) {
							e.printStackTrace();
						}
					}
				});
				accountLink.setForeground(Color.BLUE);
				registerPanel.add(accountLink, "West");
				registerPanel.add(new Panel(), "Center");
			}
		} catch (Error error) {
		}


		loginPanel.add(registerPanel, "Center");
		loginPanel.add(this.launchButton, "East");
		panel.add(loginPanel, "South");

		this.errorLabel.setFont(new Font(null, 2, 16));
		this.errorLabel.setForeground(new Color(8388608));
		panel.add(this.errorLabel, "North");


		return panel;
	}

	private Panel buildOfflinePanel() {
		Panel panel = new Panel() {
			private static final long serialVersionUID = 1L;
			private final Insets insets = new Insets(12, 24, 16, 32);

			public Insets getInsets() {
				return this.insets;
			}

			public void update(Graphics g) {
				paint(g);
			}

			public void paint(Graphics g) {
				super.paint(g);
				int hOffs = 0;
				g.setColor(Color.BLACK);
				g.drawRect(0, hOffs, getWidth() - 1, getHeight() - 1 - hOffs);
				g.drawRect(1, 1 + hOffs, getWidth() - 3, getHeight() - 3 - hOffs);
				g.setColor(Color.WHITE);

				g.drawRect(2, 2 + hOffs, getWidth() - 5, getHeight() - 5 - hOffs);
			}
		};

		panel.setBackground(Color.GRAY);
		BorderLayout layout = new BorderLayout();
		panel.setLayout(layout);

		Panel loginPanel = new Panel(new BorderLayout());
		loginPanel.add(new Panel(), "Center");
		panel.add(new Panel(), "Center");
		loginPanel.add(this.retryButton, "East");
		loginPanel.add(this.offlineButton, "West");

		boolean canPlayOffline = this.launcherFrame.canPlayOffline(this.userName.getText());
		this.offlineButton.setEnabled(canPlayOffline);
		if (!canPlayOffline) {
			panel.add(new Label("Play online once to enable offline"), "Center");
		}
		panel.add(loginPanel, "South");

		this.errorLabel.setFont(new Font(null, 2, 16));
		this.errorLabel.setForeground(new Color(8388608));
		panel.add(this.errorLabel, "North");


		return panel;
	}

	public void setError(String errorMessage) {
		removeAll();
		add(buildLoginPanel());
		this.errorLabel.setText(errorMessage);
		validate();
	}

	public void loginOk() {
		writeUsername();
	}

	public void setNoNetwork() {
		removeAll();
		add(buildOfflinePanel());
		validate();
	}

	public void checkAutologin() {
		if (this.password.getText().length() > 0) {
			this.launcherFrame.login(this.userName.getText(), this.password.getText());
		}
	}

	public void setOutdated() {
		this.outdated = true;
	}
}