package holeg.model;

import holeg.interfaces.TimelineDependent;
import holeg.model.Flexibility.FlexState;
import holeg.ui.controller.IndexTranslator;
import holeg.ui.model.IdCounter;
import holeg.utility.math.vector.Vec2f;

import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;
import java.util.ListIterator;
import java.util.logging.Logger;

/**
 * The class "HolonElement" represents any possible element that can be added to
 * a HolonObject.
 *
 * @author Gruppe14
 */
public class HolonElement implements TimelineDependent {
    private static final Logger log = Logger.getLogger(HolonElement.class.getName());
    /**
     * Owner of the Element
     */
    public transient HolonObject parentObject;
    /**
     * Whether the gadget is active or not (currently uses/produces the energy in energyPerElement)
     */
    public boolean active;
    public Priority priority = Priority.Low;
    public List<Flexibility> flexList = new ArrayList<>();
    /**
     * Points of new TestGraph
     * Represent the Graph
     * the X component from a Point is period from 0..1
     * the Y component from a Point is the percentage from 0..1
     */
    private LinkedList<Vec2f> graphPoints = new LinkedList<>();
    /**
     * Name of the gadget, e.g. TV
     */
    private String name;
    /**
     * Amount of same elements
     */
    private float energy;
    private Period period = new Period();
    /*
     * Energy at each point of the graph with 100 predefined points. At the
     * beginning, it starts with all values at energyPerElement.
     * If switched to flexible, this represents the maximum of usable energy
     */
    private transient float[] curveSample;
    private transient float actualEnergy = 0;


    /**
     * Create a new HolonElement with a user-defined name, amount of the same
     * element, energyPerElement and corresponding model.
     *
     * @param eleName String
     * @param energy  float
     */

    /**
     * same as standard constructor, but with already given id (so the counter is not increased twice)
     */
    public HolonElement(HolonObject parentObject, String eleName, float energy) {
        this.parentObject = parentObject;
        setName(eleName);
        setEnergy(energy);
        this.active = true;
        initGraphPoints();
        sampleGraph();
    }


    /**
     * Create a copy of the HolonElement given each one a new ID.
     *
     * @param other element to copy
     */
    public HolonElement(HolonElement other) {
        this.parentObject = other.parentObject;
        this.priority = other.getPriority();
        this.period = other.period;
        this.flexList = new ArrayList<>(other.flexList);
        setName(other.getName());
        setEnergy(other.getEnergy());
        this.active = other.active;
        setGraphPoints(new LinkedList<>());
        for (Vec2f p : other.getGraphPoints()) {
            this.graphPoints.add(new Vec2f(p));
        }
        this.actualEnergy = other.actualEnergy;
        sampleGraph();
    }

    @Override
    public Period getPeriod() {
        return period;
    }

    @Override
    public void setPeriod(Period period) {
        this.period = period;
    }



    /**
     * Get the user-defined Name.
     *
     * @return the name String
     */
    public String getName() {
        return name;
    }

    /**
     * Set the name to any new name.
     *
     * @param name the name to set
     */
    public void setName(String name) {
        this.name = name;
    }


    /**
     * Get the energyPerElement value of the selected Element.
     *
     * @return the energyPerElement
     */
    public float getEnergy() {
        return energy;
    }

    /**
     * Set the energyPerElement value of the selected Element.
     *
     * @param energyPerElement the energyPerElement to set
     */
    public void setEnergy(float energyPerElement) {
        log.finest(this.energy + " -> " + energyPerElement);
        this.energy = energyPerElement;
    }


    /**
     * Check the HolonElemnet is a Producer
     *
     * @return true when the energy used be each element is higher then 0
     */
    public boolean isProducer() {
        return (energy > 0);
    }

    /**
     * Check the HolonElemnet is a Consumer
     *
     * @return true when the energy used be each element is lower then 0
     */
    public boolean isConsumer() {
        return (energy < 0);
    }


    public Priority getPriority() {
        return priority;
    }


    public void setPriority(Priority priority) {
        this.priority = priority;
    }

    public String toString() {
        return "[HolonElement: " +
                ", eleName=" + name +
                ", parentName=" + parentObject.getName() +
                ", active=" + active +
                ", energyPerElement used=" + energy +
                "]";
    }

    /**
     * Initialize the {@link HolonElement#graphPoints} List with the normal 2 Points at 100%.
     */
    private void initGraphPoints() {
        graphPoints.clear();
        graphPoints.add(new Vec2f(0f, 1.0f));
        graphPoints.add(new Vec2f(1f, 1.0f));
    }

    /**
     * Getter for the graphPoint List.
     *
     * @return {@link HolonElement#graphPoints}
     */
    public LinkedList<Vec2f> getGraphPoints() {
        return graphPoints;
    }

    /**
     * Setter for the graphPoint List.
     */
    public void setGraphPoints(LinkedList<Vec2f> graphPoints) {
        this.graphPoints = graphPoints;
    }


    //interfaces.GraphEditable
    @Override
    public GraphType getGraphType() {
        return GraphType.doubleGraph;
    }


    @Override
    public LinkedList<Vec2f> getStateGraph() {
        return getGraphPoints();
    }


    @Override
    public void sampleGraph() {
        curveSample = sampleGraph(100);
    }

    @Override
    public void reset() {
        initGraphPoints();
        sampleGraph();
    }

    /**
     * Generate out of the Graph Points a array of floats that represent the Curve at each sample position. The Values are in the Range [0,1].
     * e.g. 0.0 represent: "0%" , 0.34 represent: 34%  1.0 represent: "100%"
     *
     * @param sampleLength amount of samplePositions. The positions are equidistant on the Range[0,1].
     * @return the float array of samplepoints.
     */
    private float[] sampleGraph(int sampleLength) {
        ListIterator<Vec2f> iter = this.graphPoints.listIterator();
        Vec2f before = iter.next();
        Vec2f after = iter.next();
        float[] sampleCurve = new float[sampleLength];
        for (int i = 0; i < sampleLength; i++) {
            double graphX = (double) i / (double) (sampleLength - 1); //from 0.0 to 1.0
            if (graphX > after.x) {
                before = after;
                after = iter.next();
            }
            //t to determine how many percentage the graphX is to the next Point needed to calc Bezier
            //inverseLerp(valueBetween, min, max) (valueBetween - min) / (max - min)
            // e.g. old.x = 0.4, actual.x = 0.8 and graphX = 0.6 then t is 0.5
            double t = (after.x - before.x > 0) ? (graphX - before.x) / (after.x - before.x) : 0.0;
            sampleCurve[i] = (float) getYBetweenTwoPoints(t, before, after);
        }
        return sampleCurve;
    }

    /**
     * Helper method for {@link HolonElement#sampleGraph(int)}.
     * <p>
     * Its get the start and Endposition and calculate the Points in between for the Bezi�r Curve.
     * Then its get the Y Value a.k.a. the percentage from the curve at the X value t.
     *
     * @param t     is in Range [0,1] and represent how much the X value is traverse along the Curve between the two Points.
     * @param start is the start Point of the Curve.
     * @param end   is the end Point of the Curve.
     * @return the percentage from the Curve at the X Value based on t.
     */
    private double getYBetweenTwoPoints(double t, Vec2f start, Vec2f end) {

        float mitte = (start.x + end.x) * 0.5f;
        Vec2f bezier = getBezierPoint(t, start, new Vec2f(mitte, start.y), new Vec2f(mitte, end.y), end);
        return bezier.y;
    }

    /**
     * Helper method for {@link HolonElement#getYBetweenTwoPoints(double, Vec2f, Vec2f)}.
     * <p>
     * A Method for a normal Cubic Bezier Curve. A Cubic Bezier curve has four control points.
     *
     * @param t  is in Range [0,1] how much it traverse along the curve.
     * @param p0 StartPoint
     * @param p1 ControlPoint
     * @param p2 ControlPoint
     * @param p3 EndPoint
     * @return the BezierPosition at t.
     */
    private Vec2f getBezierPoint(double t, Vec2f p0, Vec2f p1, Vec2f p2, Vec2f p3) {
        /*
         * Calculate Bezi�r:
         * B(t) = (1-t)^3 * P0 + 3*(1-t)^2 * t * P1 + 3*(1-t)*t^2 * P2 + t^3 * P3 , 0 < t < 1
         *
         * Source: //http://www.theappguruz.com/blog/bezier-curve-in-games
         */
        Vec2f bezier = new Vec2f();
        double OneSubT = 1 - t;
        double OneSubT2 = Math.pow(OneSubT, 2);
        double OneSubT3 = Math.pow(OneSubT, 3);
        double t2 = Math.pow(t, 2);
        double t3 = Math.pow(t, 3);

        bezier.x = (float) (OneSubT3 * p0.x + 3 * OneSubT2 * t * p1.x + 3 * OneSubT * t2 * p2.x + t3 * p3.x);
        bezier.y = (float) (OneSubT3 * p0.y + 3 * OneSubT2 * t * p1.y + 3 * OneSubT * t2 * p2.y + t3 * p3.y);
        return bezier;

    }


    /*
     * STATE
     */

    //TODO(Tom2021-12-1): public -> package
    public void calculateState(int timestep) {
        flexList.forEach(flex -> flex.calculateState(timestep));
        float energyWhenActive = energy * this.curveSample[IndexTranslator.getEffectiveIndex(this, timestep)];
        actualEnergy = isOn() ? energyWhenActive : 0;
    }

    /**
     * Get the energyPerElement currently(at given time step) available
     */
    public float calculateExpectedEnergyAtTimeStep(int timestep) {
        float energyWhenActive = energy * this.curveSample[IndexTranslator.getEffectiveIndex(this, timestep)];
        return active ? energyWhenActive : 0;
    }

    public float getActualEnergy() {
        return actualEnergy;
    }

    public boolean isOn() {
        //return isFlexActive()?!active:active;
        //Bool logic XOR
        return isFlexActive() ^ active;
    }

    public boolean isFlexActive() {
        return flexList.stream().anyMatch(flex -> flex.getState() == FlexState.IN_USE || flex.getState() == FlexState.ON_COOLDOWN);
    }

    public enum Priority {
        Low, Medium, High, Essential
    }


    public void updateReference(){
        flexList.forEach(flex -> flex.setElement(this));
    }

}