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/*
 * ===========================================
 * Java Pdf Extraction Decoding Access Library
 * ===========================================
 *
 * Project Info:  http://www.idrsolutions.com
 * Help section for developers at http://www.idrsolutions.com/support/
 *
 * (C) Copyright 1997-2017 IDRsolutions and Contributors.
 *
 * This file is part of JPedal/JPDF2HTML5
 *
 @LICENSE@
 *
 * ---------------
 * GraphicsStates.java
 * ---------------
 */
package org.jpedal.parser.gs;

import org.jpedal.color.GenericColorSpace;
import org.jpedal.objects.GraphicsState;
import org.jpedal.objects.TextState;
import org.jpedal.parser.ParserOptions;
import org.jpedal.render.DynamicVectorRenderer;
import org.jpedal.utils.LogWriter;
import org.jpedal.utils.repositories.Vector_Int;
import org.jpedal.utils.repositories.Vector_Object;

public class GraphicsStates {

    /**
     * flag to show if stack setup
     */
    private boolean isStackInitialised;

    /**
     * stack for graphics states
     */
    private Vector_Object graphicsStateStack;

    /**
     * stack for graphics states
     */
    private Vector_Object strokeColorStateStack;

    /**
     * stack for graphics states
     */
    private Vector_Object nonstrokeColorStateStack;

    private Vector_Int nonstrokeColorValueStack, strokeColorValueStack;

    /**
     * stack for graphics states
     */
    private Vector_Object textStateStack;

    int depth;

    ParserOptions parserOptions = new ParserOptions();


    public GraphicsStates(final ParserOptions parserOptions) {
        this.parserOptions = parserOptions;
    }

    /**
     * put item in graphics stack
     */
    public void pushGraphicsState(final GraphicsState gs, final DynamicVectorRenderer current) {

        if (!isStackInitialised) {
            isStackInitialised = true;

            graphicsStateStack = new Vector_Object(10);
            textStateStack = new Vector_Object(10);

            strokeColorStateStack = new Vector_Object(20);
            nonstrokeColorStateStack = new Vector_Object(20);

            nonstrokeColorValueStack = new Vector_Int(20);
            strokeColorValueStack = new Vector_Int(20);

            //clipStack=new Vector_Object(20);
        }

        depth++;

        //store
        graphicsStateStack.push(gs.deepCopy());

        //store clip
        //		Area currentClip=gs.getClippingShape();
        //		if(currentClip==null)
        //			clipStack.push(null);
        //		else{
        //			clipStack.push(currentClip.clone());
        //		}
        //store text state (technically part of gs)
        textStateStack.push(gs.getTextState().deepCopy());

        //save colorspaces
        nonstrokeColorStateStack.push(gs.nonstrokeColorSpace);
        strokeColorStateStack.push(gs.strokeColorSpace);

        //preserve colors
        final int strokeColorData = gs.strokeColorSpace.getColor().getRGB();
        final int nonStrokeColorData = gs.nonstrokeColorSpace.getColor().getRGB();

        strokeColorValueStack.push(strokeColorData);
        nonstrokeColorValueStack.push(nonStrokeColorData);

        //System.out.println(gs.nonstrokeColorSpace+" "+gs.strokeColorSpace);

        current.writeCustom(DynamicVectorRenderer.RESET_COLORSPACE, null);

    }

    /**
     * restore GraphicsState status from graphics stack
     */
    public GraphicsState restoreGraphicsState(final DynamicVectorRenderer current) {

        GraphicsState gs = new GraphicsState();
        gs.setTextState(new TextState());

        if (!isStackInitialised) {

            LogWriter.writeLog("No GraphicsState saved to retrieve");

        } else if (depth > 0) {

            depth--;

            gs = (GraphicsState) graphicsStateStack.pull();
            gs.setTextState((TextState) textStateStack.pull());

            gs.strokeColorSpace = (GenericColorSpace) strokeColorStateStack.pull();
            gs.nonstrokeColorSpace = (GenericColorSpace) nonstrokeColorStateStack.pull();

            final int strokeColorData = strokeColorValueStack.pull();
            final int nonStrokeColorData = nonstrokeColorValueStack.pull();

            gs.resetColorSpaces(strokeColorData, nonStrokeColorData);

        }

        //save for later
        if (parserOptions.isRenderPage()) {

            current.drawClip(gs, parserOptions.defaultClip, false);

            current.writeCustom(DynamicVectorRenderer.RESET_COLORSPACE, null);

            /*
             * align display
             */
            current.setGraphicsState(GraphicsState.FILL, gs.getAlpha(GraphicsState.FILL), gs.getBMValue());
            current.setGraphicsState(GraphicsState.STROKE, gs.getAlpha(GraphicsState.STROKE), gs.getBMValue());
        }

        return gs;
    }


    public int getDepth() {
        return depth;
    }

    public void correctDepth(final int currentDepth, final GraphicsState gs, final DynamicVectorRenderer current) {

        while (depth > currentDepth) {
            restoreGraphicsState(current);
        }
    }
}