import java.util.ArrayList;
import java.util.Collections;

import java.awt.Canvas;
import java.awt.Graphics2D;
import java.awt.Dimension;
import java.awt.BorderLayout;
import java.awt.GridLayout;

import java.awt.event.KeyEvent;
import java.awt.event.MouseEvent;
import java.awt.event.MouseWheelEvent;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import java.awt.image.BufferStrategy;

import java.awt.geom.Point2D;
import java.awt.geom.NoninvertibleTransformException;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JButton;

public class BattleScene extends MapScene {

	private enum Mode {
		NONE, ATTACK, MOVE
	};

	// TODO: refractor, make Points()
	private int previousX = -1;
	private int previousY = -1;
	// TODO: what the fuck is the difference between these two?
	private Actor selectedActor;
	private Actor lastActor;

	private Mode mode;
	
	private boolean actorClicked = false;
	
	// TODO: these are the coordinates of the mouse => refractor names
	private int realX = 0;
	private int realY = 0;

	public BattleScene() {
		super();

		// TODO: this should be handled in MapScene
		MapLoader mapLoader = new MapLoader("../testmap.json");
		this.map = mapLoader.getMap();

		this.selectedActor = this.map.getNextActor();

		this.setLayout(new BorderLayout());

		// TODO: make a method buildUi() ?
		JPanel bottomPanel = new JPanel();
		bottomPanel.setLayout(new GridLayout(1,4));

		JButton moveButton = new JButton("Move");
		moveButton.setActionCommand("move");
		JButton attackButton = new JButton("Attack");
		attackButton.setActionCommand("attack");
		JButton nextButton = new JButton("Next");
		nextButton.setActionCommand("next");
		JButton passButton = new JButton("Pass");
		passButton.setActionCommand("pass");

		moveButton.addActionListener(this);
		attackButton.addActionListener(this);
		nextButton.addActionListener(this);
		passButton.addActionListener(this);

		bottomPanel.add(moveButton);
		bottomPanel.add(attackButton);
		bottomPanel.add(nextButton);
		bottomPanel.add(passButton);

		this.add(bottomPanel, BorderLayout.PAGE_END);
		this.add(this.canvas, BorderLayout.CENTER);
	}

	@Override
	protected void absoluteRender(Graphics2D g) {
		//draw cursor
		//g.setColor(Palette.BLUE);
		//g.fillOval(this.realX-10*this.guiSize, this.realY-10*this.guiSize, 20*this.guiSize, 20*this.guiSize);
		//g.setColor(Palette.ORANGE);
		//g.drawOval(this.realX-10*this.guiSize, this.realY-10*this.guiSize, 20*this.guiSize, 20*this.guiSize);

		//draw panels
		g.setColor(Palette.WHITE_T);
		g.fillRect(this.canvasSize.width-100*this.guiSize, this.canvasSize.height-100*this.guiSize,
				100*this.guiSize, 100*this.guiSize);
		g.fillRect(0, this.canvasSize.height-100*this.guiSize, 150*this.guiSize, 100*this.guiSize);

		g.setColor(Palette.BLACK);
		g.setFont(g.getFont().deriveFont(12.0F*this.guiSize));
		Tile tile = null;
		
		try{
			tile = this.map.getTile(this.previousX, this.previousY);
			switch (tile.getType()) {
				case CLEAR:
					break;
				case GRASS:
					g.drawString("Grass", this.canvasSize.width-90*this.guiSize, this.canvasSize.height-80*this.guiSize);
					break;
				case WATER:
					g.drawString("Water", this.canvasSize.width-90*this.guiSize, this.canvasSize.height-80*this.guiSize);
					break;
				case MOUNTAIN:
					g.drawString("Mountain", this.canvasSize.width-90*this.guiSize, this.canvasSize.height-80*this.guiSize);
					break;
			}

			g.setFont(g.getFont().deriveFont(8.0F*this.guiSize));
			if (this.actorClicked && this.lastActor != null) {
				g.setColor(Palette.WHITE_T);
				g.fillRect(0, 0, 100*this.guiSize, 150*this.guiSize);
				g.fillRect(this.canvasSize.width-100*this.guiSize, 0, 100*this.guiSize, 100*this.guiSize);

				g.setColor(Palette.BLACK);
				g.drawString(this.lastActor.getName(), 5*this.guiSize, 15*this.guiSize);

				g.drawString("HP", 5*this.guiSize, 30*this.guiSize);
				g.setColor(Palette.RED);
				g.fillRect(20*this.guiSize, 22*this.guiSize, 70*this.guiSize, 10*this.guiSize);
				g.setColor(Palette.DARKGREEN);
				g.fillRect(20*this.guiSize, 22*this.guiSize, 70*this.guiSize*this.lastActor.getHP()/10, 10*this.guiSize);

				g.setColor(Palette.BLACK);
				g.drawString("Agility: " + Integer.toString(this.lastActor.getSkills().agility),
						5*this.guiSize, 45*this.guiSize);
			} else if (this.actorClicked) {
				g.setColor(Palette.WHITE_T);
				g.fillRect(0, 0, 100*this.guiSize, 150*this.guiSize);
				g.fillRect(this.canvasSize.width-100*this.guiSize, 0, 100*this.guiSize, 100*this.guiSize);

				g.setColor(Palette.BLACK);
				g.drawString("None left", 5*this.guiSize, 15*this.guiSize);
			}
		} catch (ArrayIndexOutOfBoundsException ex) {
		} catch (NullPointerException ext) {
			System.out.println("map non existent");
			ext.printStackTrace();
		}
	}

	@Override
	protected void update(long deltaNanoTime) {
		ArrayList<Actor> actorsToRemove = new ArrayList<>();
		int enemyCounter = 0;
	
		for (Actor actor : this.map.getActors()) {
			if (!actor.isAlive()) {
				actorsToRemove.add(actor);
			}
			if (actor.isEnemy()) {
				enemyCounter++;
			}
		}	

		for (Actor actor : actorsToRemove) {
			this.map.removeActor(actor);
		}

		if (selectedActor != null) {
			this.map.setCursor(selectedActor.getX(), selectedActor.getY());
		} else {
			this.map.setCursor(-1, -1);
		}

		if (enemyCounter == 0) {
			// win
			// TODO: reimplement on upper level
			// this.main.backToMenu();
		}	
	}

	private void aiPlay() {
		// TODO: write AI code
		// give back control back to the player
		this.map.resetActors();
		this.selectedActor = this.map.getNextActor();
		this.lastActor = this.selectedActor;
		this.actorClicked = true;
	}

	@Override
	public void mouseClicked(MouseEvent e) {

		int tileSize = this.maxSize/10;
		Point2D p = new Point2D.Double(e.getX(), e.getY());
		
		try {
			p = this.tx.inverseTransform(p, null);
		} catch (NoninvertibleTransformException ex) {}
		
		try {
			// find actor under cursor
			int x = (int) (p.getX()/tileSize);
			int y = (int) (p.getY()/tileSize);
			Tile tile = this.map.getTile(x, y);
			Actor actor = null;

			for (Actor i : this.map.getActors()) {
				if (x == i.getX() && y == i.getY()) {
					actor = i;
					break;
				}
			}

			if (actor != null) {
				this.actorClicked = true;
				this.lastActor = actor;
			} else {
				this.actorClicked = false;
			}

			if (this.mode == Mode.MOVE) {
				if (tile.isSelected()) {
					this.selectedActor.move(x, y);
					this.mode = Mode.NONE;
					this.map.clearSelected();
					if (this.selectedActor.getActionsLeft() <= 0) {
						this.selectedActor = this.map.getNextActor();
						this.lastActor = this.selectedActor;
						this.actorClicked = true;
					}
				}
			} else if (this.mode == Mode.ATTACK) {
				if (actor != null) {
					this.selectedActor.hit(actor, this.map);
					if (this.selectedActor.getActionsLeft() <= 0) {
						this.selectedActor = this.map.getNextActor();
						this.lastActor = this.selectedActor;
						this.actorClicked = true;
					}
				}
				this.mode = Mode.NONE;
				this.map.clearSelected();
			}
		} catch (ArrayIndexOutOfBoundsException ex) {
			System.out.println("no tile clicked");
		} catch (NullPointerException ext) {
			//ext.printStackTrace();
			System.out.println("map non existent");
		}
	}

	@Override
	public void mouseMoved(MouseEvent e) {
		this.realX = e.getX();
		this.realY = e.getY();
		int tileSize = this.maxSize/10;
		Point2D p = new Point2D.Double(e.getX(), e.getY());
		try {
			p = this.tx.inverseTransform(p, null);
		} catch (NoninvertibleTransformException ex) {}
		int x = (int) (p.getX()/tileSize);
		int y = (int) (p.getY()/tileSize);
		try {
			Tile tile = this.map.getTile(x, y);
			if (x != this.previousX || y != this.previousY) {
				if (this.mode == Mode.MOVE) {
					this.map.clearSelected();
					ArrayList<Tile> path = this.map.getPath(this.selectedActor, x, y);
					Collections.reverse(path);
					for (int i=0; i<this.selectedActor.getSkills().agility; i++) {
						path.get(i).setSelected(true);
						if (i == path.size()-1) {
							break;
						}
					}
				}
				this.previousX = x;
				this.previousY = y;
			}
		} catch (ArrayIndexOutOfBoundsException ex) {
			System.out.println("no tile clicked");
		} catch (NullPointerException ext) {
			System.out.println("map non existent");
		}
	}

	@Override
	public void actionPerformed(ActionEvent e) {
		// TODO: rename Ui elements to ex. btn-move, btn-pass, ...
		if ("move".equals(e.getActionCommand()) && this.selectedActor != null) {
			this.map.clearSelected();
			this.mode = Mode.MOVE;
			this.lastActor = this.selectedActor;
			this.actorClicked = true;
		} else if ("pass".equals(e.getActionCommand())) {
			this.map.clearSelected();
			this.aiPlay();
		} else if ("attack".equals(e.getActionCommand()) && this.selectedActor != null) {
			this.map.clearSelected();
			int range = this.selectedActor.getWeapon().getRange();
			int x = this.selectedActor.getX();
			int y = this.selectedActor.getY();
			for (int r=-range; r <= range; r++) {
				for (int c=-range; c <= range; c++) {
					if (x+r >=0 &&
						x+r < this.map.getSize() &&
						y+c >= 0 &&
						y+c < this.map.getSize()) {
							this.map.getTile(x+r, y+c).setSelected(true);
					}
				}
			}
			this.mode = Mode.ATTACK;
		} else if ("next".equals(e.getActionCommand())) {
			this.map.clearSelected();
			this.selectedActor = this.map.getNextActor();
			this.lastActor = this.selectedActor;
			this.actorClicked = true;
		}

	}
}