import java.awt.AlphaComposite;
import java.awt.Composite;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;

import java.util.ArrayList;


public class WorldScene extends Scene {
    
    private ArrayList<Actor> actors = new ArrayList<Actor>();
    private Map map;

    private int tileSize;
    private int panX = 0;
    private int panY = 0;

    public WorldScene(Dimension gridSize, int tileSize) {
        this.tileSize = tileSize;
        map = new Map(gridSize);


        // TODO remove hardcoded stuff 
        Actor player = new Actor("pipo", 100, Actor.Type.PLAYER, gridSize);
        player.equipWeapon(new Weapon(1000, 10, 1, 0));
        Actor enemy = new Actor("marco", 100, Actor.Type.ENEMY, gridSize);
        enemy.move(5, 5);

        this.actors.add(player);
        this.actors.add(enemy);
    }

    private Composite makeAlpha(Graphics2D g2d, float alpha) {
        Composite originalComposite = g2d.getComposite();
        g2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, alpha));

        return originalComposite;
    }

    @Override
    public void zoom(int value) {
        if (this.tileSize > 5 || value > 0) {
            this.tileSize = this.tileSize + value;
        }
    }

    @Override
    public void pan(int x, int y) {
        this.panX += x;
        this.panY += y;
    }

    @Override
    public void render(Graphics g) {
        Graphics2D g2d = (Graphics2D) g;

        // draw tiles
        for (Tile tile : this.map.grid) {
            switch (tile.type) {
                case GRASS:
                    g2d.setColor(Palette.GREEN);
                    break;
                case WATER:
                    g2d.setColor(Palette.BLUE);
                    break;
            }

            g2d.fillRect(
                this.tileSize * tile.x + this.panX,
                this.tileSize * tile.y + this.panY,
                this.tileSize, this.tileSize
            );

            Composite originalComposite  = makeAlpha(g2d, .5f);

            if (tile.selected) {
                g2d.setColor(Palette.RED);
                g2d.fillRect(
                    this.tileSize * tile.x + this.panX,
                    this.tileSize * tile.y + this.panY,
                    this.tileSize, this.tileSize
                );
            }

            // draw grid (with composite)
            g2d.setPaint(Palette.BLACK);
            g2d.drawRect(
                this.tileSize * tile.x + this.panX,
                this.tileSize * tile.y + this.panY,
                this.tileSize, this.tileSize
            );

            g2d.setComposite(originalComposite);
        }

        // draw actors
        for (Actor actor : this.actors) {
            switch (actor.type) {
                case PLAYER:
                    g2d.setColor(Palette.ORANGE);
                    break;
                case ENEMY:
                    g2d.setColor(Palette.RED);
                    break;
            }

            int gap = this.tileSize / 10;
            g2d.fillRect(
                (this.tileSize * actor.getX()) + gap + this.panX,
                (this.tileSize * actor.getY()) + gap + this.panY,
                this.tileSize - gap * 2, this.tileSize - gap * 2
            );

            if (!actor.isAlive()) {
                g2d.setColor(Palette.BLUE);
                g2d.fillRect(
                    (this.tileSize * actor.getX()) + gap + this.panX,
                    (this.tileSize * actor.getY()) + this.tileSize/4 + this.panY,
                    this.tileSize - gap * 2, this.tileSize/4 
                );
            }
        }
    }

    @Override
    public void mouseClicked(int x, int y) {
        //TODO fix mouse tracking with pan
        this.updateTiles();

        Tile tile = map.getTile(
            (int) ((x + this.panX)/(double)this.tileSize), 
            (int) ((y + this.panY)/(double)this.tileSize) 
        );

        tile.selected = !tile.selected;

        //TODO remove test stuff
        if (tile.getActor() != null) {
            Actor actor = tile.getActor();
            Actor player = this.actors.get(0);
            player.shoot(actor, 1);
        }
    }

    // ugh, performance
    public void updateTiles() {
        for (Tile tile : this.map.grid) {
            tile.clearActor();
        }

        for (Actor actor : this.actors) {
            Tile tile = map.getTile(actor.getX(), actor.getY());
            tile.setActor(actor);
        }       
    }
}