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/*******************************************************************************
 * Copyright 2019 See AUTHORS file.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/

package com.talosvfx.talos.runtime.modules;

import com.badlogic.gdx.graphics.Color;
import com.badlogic.gdx.math.Vector2;
import com.badlogic.gdx.utils.Json;
import com.badlogic.gdx.utils.JsonValue;
import com.talosvfx.talos.runtime.Particle;
import com.talosvfx.talos.runtime.ParticleDrawable;
import com.talosvfx.talos.runtime.ScopePayload;
import com.talosvfx.talos.runtime.values.DrawableValue;
import com.talosvfx.talos.runtime.values.NumericalValue;

public class ParticleModule extends AbstractModule {

    public static final int ID = 0;
    public static final int TAG = 1;
    public static final int DRAWABLE = 2;
    public static final int OFFSET = 3;
    public static final int LIFE = 4;

    public static final int VELOCITY = 5;
    public static final int GRAVITY = 6;
    public static final int ROTATION = 7;
    public static final int TARGET = 8;
    public static final int COLOR = 9;
    public static final int TRANSPARENCY = 10;
    public static final int ANGLE = 11;
    public static final int MASS = 12;
    public static final int SIZE = 13;
    public static final int POSITION = 14;


    DrawableValue drawable;
    NumericalValue offset;
    NumericalValue life;
    NumericalValue velocity;
    NumericalValue gravity;
    NumericalValue rotation;
    NumericalValue target;
    NumericalValue color;
    NumericalValue transparency;
    NumericalValue angle;
    NumericalValue mass;
    NumericalValue size;
    NumericalValue position;

    Color tmpColor = new Color();
    Vector2 tmpVec = new Vector2();
    private ParticleDrawable defaultDrawable;

    @Override
    protected void defineSlots() {
        drawable = (DrawableValue) createInputSlot(DRAWABLE, new DrawableValue());
        offset = createInputSlot(OFFSET);
        life = createInputSlot(LIFE);
        velocity = createInputSlot(VELOCITY);
        gravity = createInputSlot(GRAVITY);
        rotation = createInputSlot(ROTATION);
        target = createInputSlot(TARGET);
        color = createInputSlot(COLOR);
        transparency = createInputSlot(TRANSPARENCY);
        angle = createInputSlot(ANGLE);
        mass = createInputSlot(MASS);
        size = createInputSlot(SIZE);
        position = createInputSlot(POSITION);

        rotation.setFlavour(NumericalValue.Flavour.ANGLE);
        angle.setFlavour(NumericalValue.Flavour.ANGLE);
    }

    @Override
    public void processValues() {
        // nothing to process, it's all cool as cucumber
    }

    public void updateScopeData(Particle particle) {
        getScope().set(ScopePayload.EMITTER_ALPHA, particle.getEmitterAlpha());
        getScope().set(ScopePayload.PARTICLE_ALPHA, particle.alpha);
        getScope().set(ScopePayload.PARTICLE_SEED, particle.seed);
        getScope().set(ScopePayload.REQUESTER_ID, particle.seed);
        getScope().set(ScopePayload.EMITTER_ALPHA_AT_P_INIT, particle.durationAtInit);
        getScope().set(ScopePayload.PARTICLE_POSITION, particle.getX(), particle.getY());

        getScope().setParticle(particle);
    }

    public ParticleDrawable getDrawable() {
        fetchInputSlotValue(DRAWABLE);
        if(drawable.isEmpty() || drawable.getDrawable() == null) {
            return defaultDrawable;
        }

        return drawable.getDrawable();
    }

    public float getTransparency() {
        fetchInputSlotValue(TRANSPARENCY);
        if(transparency.isEmpty()) return 1; // defaults
        return transparency.getFloat();
    }

    public float getLife() {
        fetchInputSlotValue(LIFE);
        if(life.isEmpty()) return 2; // defaults
        return life.getFloat();
    }

    public float getAngle() {
        fetchInputSlotValue(ANGLE);
        if(angle.isEmpty()) return 90; // defaults
        return angle.getFloat();
    }

    public float getVelocity() {
        fetchInputSlotValue(VELOCITY);
        if(velocity.isEmpty()) return 0; // defaults
        return velocity.getFloat();
    }

    public float getRotation() {
        fetchInputSlotValue(ROTATION);
        if(rotation.isEmpty()) return 0; // defaults
        return rotation.getFloat();
    }

    public Vector2 getSize() {
        fetchInputSlotValue(SIZE);
        if(size.isEmpty()) {
            tmpVec.set(1f, 1f/getScope().getFloat(ScopePayload.DRAWABLE_ASPECT_RATIO));
        }  else if(size.elementsCount() == 1) {
            tmpVec.set(size.getFloat(), size.getFloat() / getScope().getFloat(ScopePayload.DRAWABLE_ASPECT_RATIO));
        } else if (size.elementsCount() == 2) {
            tmpVec.set(size.get(0), size.get(1));
        } else {
            tmpVec.set(1f, 1f/getScope().getFloat(ScopePayload.DRAWABLE_ASPECT_RATIO));
        }

        return tmpVec;
    }

    public Color getColor() {
        fetchInputSlotValue(COLOR);
        if(color.isEmpty()) return Color.WHITE; // defaults
        tmpColor.set(color.get(0), color.get(1), color.get(2), 1f);
        return tmpColor;
    }

    public Vector2 getStartPosition() {
        fetchInputSlotValue(OFFSET);
        if(offset.isEmpty()) {
            tmpVec.set(0, 0);
            return tmpVec;
        }
        tmpVec.set(offset.get(0), offset.get(1));

        return tmpVec;
    }

    public Vector2 getTarget() {
        fetchInputSlotValue(TARGET);
        if(target.isEmpty()) {
            return null;
        }
        tmpVec.set(target.get(0), target.get(1));

        return tmpVec;
    }

    public Vector2 getPosition() {
        fetchInputSlotValue(POSITION);
        if(position.isEmpty()) {
            return null;
        }
        tmpVec.set(position.get(0), position.get(1));

        return tmpVec;
    }

    public void setDefaultDrawable(ParticleDrawable defaultDrawable) {
        this.defaultDrawable = defaultDrawable;
    }

    @Override
    public void write (Json json) {
        super.write(json);
    }

    @Override
    public void read (Json json, JsonValue jsonData) {
        super.read(json, jsonData);
    }
}