package mindustry.graphics;

import arc.*;
import arc.graphics.*;
import arc.graphics.g2d.*;
import arc.graphics.gl.*;
import arc.math.*;
import arc.math.geom.*;
import arc.scene.ui.layout.*;
import arc.util.ArcAnnotate.*;
import arc.util.*;

public class Shaders{
    public static Shadow shadow;
    public static BlockBuild blockbuild;
    public static @Nullable Shield shield;
    public static UnitBuild build;
    public static FogShader fog;
    public static MenuShader menu;
    public static LightShader light;
    public static SurfaceShader water, tar, slag;
    public static PlanetShader planet;
    public static PlanetGridShader planetGrid;
    public static SunShader sun;

    public static void init(){
        shadow = new Shadow();
        blockbuild = new BlockBuild();
        try{
            shield = new Shield();
        }catch(Throwable t){
            //don't load shield shader
            shield = null;
            t.printStackTrace();
        }
        build = new UnitBuild();
        fog = new FogShader();
        menu = new MenuShader();
        light = new LightShader();
        water = new SurfaceShader("water");
        tar = new SurfaceShader("tar");
        slag = new SurfaceShader("slag");
        planet = new PlanetShader();
        planetGrid = new PlanetGridShader();
        sun = new SunShader();
    }

    public static class PlanetShader extends LoadShader{
        public Vec3 lightDir = new Vec3(1, 1, 1).nor();

        public PlanetShader(){
            super("planet", "planet");
        }

        @Override
        public void apply(){
            setUniformf("u_lightdir", lightDir);
        }
    }

    public static class SunShader extends LoadShader{
        public int octaves = 5;
        public float falloff = 0.5f, scale = 1f, power = 1.3f, magnitude = 0.6f, speed = 99999999999f, spread = 1.3f, seed = Mathf.random(9999f);

        public Color[] colors;
        public float[] colorValues;

        public Vec3 center = new Vec3();

        public SunShader(){
            super("sun", "sun");
        }

        @Override
        public void apply(){
            setUniformi("u_octaves", octaves);
            setUniformf("u_falloff", falloff);
            setUniformf("u_scale", scale);
            setUniformf("u_power", power);
            setUniformf("u_magnitude", magnitude);
            setUniformf("u_time", Time.globalTime() / speed);
            setUniformf("u_seed", seed);
            setUniformf("u_spread", spread);
            setUniformf("u_center", center);

            setUniformi("u_colornum", colors.length);
            setUniform4fv("u_colors[0]", colorValues, 0, colorValues.length);
        }

        public void updateColors(){
            colorValues = new float[colors.length*4];

            for(int i = 0; i < colors.length; i ++){
                colorValues[i*4] = colors[i].r;
                colorValues[i*4 + 1] = colors[i].g;
                colorValues[i*4 + 2] = colors[i].b;
                colorValues[i*4 + 3] = colors[i].a;
            }
        }
    }

    public static class PlanetGridShader extends LoadShader{
        public Vec3 mouse = new Vec3();

        public PlanetGridShader(){
            super("planetgrid", "planetgrid");
        }

        @Override
        public void apply(){
            setUniformf("u_mouse", mouse);
        }
    }

    public static class LightShader extends LoadShader{
        public Color ambient = new Color(0.01f, 0.01f, 0.04f, 0.99f);

        public LightShader(){
            super("light", "default");
        }

        @Override
        public void apply(){
            setUniformf("u_ambient", ambient);
        }

    }

    public static class MenuShader extends LoadShader{
        float time = 0f;

        public MenuShader(){
            super("menu", "default");
        }

        @Override
        public void apply(){
            time = time % 158;

            setUniformf("u_resolution", Core.graphics.getWidth(), Core.graphics.getHeight());
            setUniformi("u_time", (int)(time += Core.graphics.getDeltaTime() * 60f));
            setUniformf("u_uv", Core.atlas.white().getU(), Core.atlas.white().getV());
            setUniformf("u_scl", Scl.scl(1f));
            setUniformf("u_uv2", Core.atlas.white().getU2(), Core.atlas.white().getV2());
        }
    }

    public static class FogShader extends LoadShader{
        public FogShader(){
            super("fog", "default");
        }
    }

    public static class UnitBuild extends LoadShader{
        public float progress, time;
        public Color color = new Color();
        public TextureRegion region;

        public UnitBuild(){
            super("unitbuild", "default");
        }

        @Override
        public void apply(){
            setUniformf("u_time", time);
            setUniformf("u_color", color);
            setUniformf("u_progress", progress);
            setUniformf("u_uv", region.getU(), region.getV());
            setUniformf("u_uv2", region.getU2(), region.getV2());
            setUniformf("u_texsize", region.getTexture().getWidth(), region.getTexture().getHeight());
        }
    }

    public static class Shadow extends LoadShader{
        public Color color = new Color();
        public TextureRegion region = new TextureRegion();
        public float scl;

        public Shadow(){
            super("shadow", "default");
        }

        @Override
        public void apply(){
            setUniformf("u_color", color);
            setUniformf("u_scl", scl);
            setUniformf("u_texsize", region.getTexture().getWidth(), region.getTexture().getHeight());
        }
    }

    public static class BlockBuild extends LoadShader{
        public Color color = new Color();
        public float progress;
        public TextureRegion region = new TextureRegion();

        public BlockBuild(){
            super("blockbuild", "default");
        }

        @Override
        public void apply(){
            setUniformf("u_progress", progress);
            setUniformf("u_color", color);
            setUniformf("u_uv", region.getU(), region.getV());
            setUniformf("u_uv2", region.getU2(), region.getV2());
            setUniformf("u_time", Time.time());
            setUniformf("u_texsize", region.getTexture().getWidth(), region.getTexture().getHeight());
        }
    }

    public static class Shield extends LoadShader{

        public Shield(){
            super("shield", "default");
        }

        @Override
        public void apply(){
            setUniformf("u_dp", Scl.scl(1f));
            setUniformf("u_time", Time.time() / Scl.scl(1f));
            setUniformf("u_offset",
            Core.camera.position.x - Core.camera.width / 2,
            Core.camera.position.y - Core.camera.height / 2);
            setUniformf("u_texsize", Core.camera.width,
            Core.camera.height);
        }
    }

    public static class SurfaceShader extends LoadShader{

        public SurfaceShader(String frag){
            super(frag, "default");
        }

        @Override
        public void apply(){
            setUniformf("camerapos", Core.camera.position.x - Core.camera.width / 2, Core.camera.position.y - Core.camera.height / 2);
            setUniformf("screensize", Core.camera.width, Core.camera.height);
            setUniformf("time", Time.time());
        }
    }

    public static class LoadShader extends Shader{
        public LoadShader(String frag, String vert){
            super(Core.files.internal("shaders/" + vert + ".vertex.glsl"), Core.files.internal("shaders/" + frag + ".fragment.glsl"));
        }
    }
}