package ru.deadsoftware.cavecraft.game;

import com.badlogic.gdx.math.*;
import ru.deadsoftware.cavecraft.Items;
import ru.deadsoftware.cavecraft.game.mobs.Mob;
import ru.deadsoftware.cavecraft.game.objects.Player;

public class GamePhysics {

    public static final int PL_SPEED = 2;

    private GameProc gameProc;

    private Vector2 gravity;

    public GamePhysics(GameProc gameProc) {
        this.gameProc = gameProc;
        gravity = new Vector2(0,1);
    }

    private boolean checkJump(Rectangle rect, int dir) {
        int bl = 0;
        switch (dir) {
            case 0:
                if ((int)((rect.x+(rect.width/2))/16) - 1>=0)
                    bl = gameProc.world.getForeMap(
                        (int)((rect.x+(rect.width/2))/16) - 1,
                        (int)(rect.y/16)+1);
                break;
            case 1:
                if ((int)((rect.x+(rect.width/2))/16) + 1<gameProc.world.getWidth())
                    bl = gameProc.world.getForeMap(
                        (int)((rect.x+(rect.width/2))/16) + 1,
                        (int)(rect.y/16)+1);
                break;
            default:
                bl=0;
        }
        return (bl>0 && Items.BLOCKS.getValueAt(bl).collision);
    }

    private boolean checkColl(Rectangle rect) {
        int bl;
        int minX = (int) ((rect.x+rect.width/2)/16)-4;
        int minY = (int) ((rect.y+rect.height/2)/16)-4;
        int maxX = (int) ((rect.x+rect.width/2)/16)+4;
        int maxY = (int) ((rect.y+rect.height/2)/16)+4;
        if (minX<0) minX=0;
        if (minY<0) minY=0;
        if (maxX>gameProc.world.getWidth()) maxX = gameProc.world.getWidth();
        if (maxY>gameProc.world.getHeight()) maxY = gameProc.world.getHeight();
        for (int y=minY; y<maxY; y++) {
            for (int x=minX; x<maxX; x++) {
                bl = gameProc.world.getForeMap(x,y);
                if (bl>0 && Items.BLOCKS.getValueAt(bl).collision){
                    if (Intersector.overlaps(rect, Items.BLOCKS.getValueAt(bl).getRect(x,y))){
                        return true;
                    }
                }
            }
        }
        return false;
    }

    private void playerPhy(Player pl) {
        pl.position.add(pl.moveY);
        if (checkColl(pl.getRect())) {
            pl.flyMode = false;
            pl.canJump = true;
            int d = -1;
            if (pl.moveY.y<0) d=1; else if (pl.moveY.y>0) d=-1;
            pl.position.y = MathUtils.round(pl.position.y);
            while (checkColl(pl.getRect())) pl.position.y+=d;
            pl.moveY.setZero();
        } else {
            pl.canJump = false;
        }
        if (!pl.flyMode) pl.moveY.add(gravity);
        pl.position.add(pl.moveX);
        if (pl.position.x<0 ||
                pl.position.x+pl.texWidth>=gameProc.world.getWidth()*16)
            pl.position.sub(pl.moveX);
        if (checkColl(pl.getRect())) {
            if (pl.canJump && !pl.flyMode) pl.position.y-=8;
            if (checkColl(pl.getRect())) {
                if (pl.canJump && !pl.flyMode) pl.position.y+=8;
                int d = 0;
                if (pl.moveX.x < 0) d = 1;
                else if (pl.moveX.x > 0) d = -1;
                pl.position.x = MathUtils.round(pl.position.x);
                while (checkColl(pl.getRect())) pl.position.x += d;
            }
        }

        /*if (checkJump(pl.getRect(), pl.dir) && !pl.flyMode && pl.canJump && !pl.moveX.equals(Vector2.Zero)) {
            pl.moveY.add(0, -8);
            pl.canJump = false;
        }*/
    }

    private void mobPhy(Mob mob) {
        mob.position.add(mob.moveY);
        if (checkColl(mob.getRect())) {
            mob.canJump = true;
            int d = -1;
            if (mob.moveY.y<0) d=1; else if (mob.moveY.y>0) d=-1;
            mob.position.y = MathUtils.round(mob.position.y);
            while (checkColl(mob.getRect())) mob.position.y+=d;
            mob.moveY.setZero();
        } else {
            mob.canJump = false;
        }
        mob.moveY.add(gravity);
        mob.position.add(mob.moveX);
        if (mob.position.x<32 ||
                mob.position.x+mob.width>gameProc.world.getWidth()*16-32)
            mob.position.sub(mob.moveX);
        if (checkColl(mob.getRect())) {
            int d = 0;
            if (mob.moveX.x<0) d=1; else if (mob.moveX.x>0) d=-1;
            mob.position.x = MathUtils.round(mob.position.x);
            while (checkColl(mob.getRect())) mob.position.x+=d;
        }
}

    public void update(float delta) {

        for (Mob mob : gameProc.mobs) {
            mob.ai();
            mobPhy(mob);
        }
        playerPhy(gameProc.player);

        gameProc.renderer.camera.position.set(
                gameProc.player.position.x+gameProc.player.texWidth/2 - gameProc.renderer.camera.viewportWidth/2,
                gameProc.player.position.y+gameProc.player.height/2-gameProc.renderer.camera.viewportHeight/2,
                0
        );
    }

}