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Copyright 2010, Google Inc.
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    * Redistributions of source code must retain the above copyright
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    * Redistributions in binary form must reproduce the above
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contributors may be used to endorse or promote products derived from
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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*/

package com.google.refine.commands.browsing;

import java.awt.Color;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;

import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.google.refine.browsing.Engine;
import com.google.refine.browsing.FilteredRows;
import com.google.refine.browsing.facets.ScatterplotDrawingRowVisitor;
import com.google.refine.browsing.facets.ScatterplotFacet;
import com.google.refine.browsing.util.NumericBinIndex;
import com.google.refine.commands.Command;
import com.google.refine.expr.Evaluable;
import com.google.refine.expr.MetaParser;
import com.google.refine.expr.ParsingException;
import com.google.refine.model.Column;
import com.google.refine.model.Project;
import com.google.refine.util.ParsingUtilities;

public class GetScatterplotCommand extends Command {

    final static Logger logger = LoggerFactory.getLogger("get-scatterplot_command");
    
    @Override
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        
        try {
            long start = System.currentTimeMillis();
            
            Project project = getProject(request);
            Engine engine = getEngine(request, project);
            PlotterConfig conf = ParsingUtilities.mapper.readValue(
            		request.getParameter("plotter"),
            		PlotterConfig.class);
            
            response.setHeader("Content-Type", "image/png");
            
            ServletOutputStream sos = null;
            
            try {
                sos = response.getOutputStream();
                draw(sos, project, engine, conf);
            } finally {
                sos.close();
            }
            
            logger.trace("Drawn scatterplot in {} ms", Long.toString(System.currentTimeMillis() - start));
        } catch (Exception e) {
            e.printStackTrace();
            respondException(response, e);
        }
    }
    
    protected static class PlotterConfig {
    	@JsonProperty(ScatterplotFacet.SIZE)
    	public int size = 100;
    	@JsonProperty(ScatterplotFacet.DOT)
    	double dot = 100;
    	@JsonIgnore
    	public int dim_x = ScatterplotFacet.LIN;
    	@JsonIgnore
    	public int dim_y = ScatterplotFacet.LIN;
    	@JsonProperty(ScatterplotFacet.ROTATION)
    	public int rotation = ScatterplotFacet.NO_ROTATION;
    	@JsonProperty(ScatterplotFacet.COLOR)
    	public String color_str = "000000";
    	@JsonProperty(ScatterplotFacet.BASE_COLOR)
    	public String base_color_str = null;
    	@JsonProperty(ScatterplotFacet.X_COLUMN_NAME)
    	public String columnName_x = "";
    	@JsonProperty(ScatterplotFacet.X_EXPRESSION)
    	public String expression_x = "value";
    	@JsonProperty(ScatterplotFacet.Y_COLUMN_NAME)
    	public String columnName_y = "";
    	@JsonProperty(ScatterplotFacet.Y_EXPRESSION)
    	public String expression_y = "value";
    	
        @JsonProperty(ScatterplotFacet.DIM_X)
        public String getDimX() {
            return dim_x == ScatterplotFacet.LIN ? "lin" : "log";
        }
        
        @JsonProperty(ScatterplotFacet.DIM_Y)
        public String getDimY() {
            return dim_y == ScatterplotFacet.LIN ? "lin" : "log";
        }
        
        @JsonProperty(ScatterplotFacet.DIM_X)
        public void setDimX(String dim) {
        	dim_x = dim.equals("lin") ? ScatterplotFacet.LIN : ScatterplotFacet.LOG;
        }
        
        @JsonProperty(ScatterplotFacet.DIM_Y)
        public void setDimY(String dim) {
        	dim_y = dim.equals("lin") ? ScatterplotFacet.LIN : ScatterplotFacet.LOG;
        }
        
        // rotation can be set to "none" (a JSON string) in which case it should be ignored
        @JsonProperty(ScatterplotFacet.ROTATION)
        public void setRotation(Object rotation) {
        	try {
        		this.rotation = Integer.parseInt(rotation.toString());
        	} catch(NumberFormatException e) {
        		;
        	}
        }
    }
    
    public void draw(OutputStream output, Project project, Engine engine, PlotterConfig o) throws IOException {

        double min_x = 0;
        double min_y = 0;
        double max_x = 0;
        double max_y = 0;
        
        int columnIndex_x = 0;
        int columnIndex_y = 0;
        
        Evaluable eval_x = null;
        Evaluable eval_y = null;
        
        Color color = new Color(Integer.parseInt(o.color_str,16));
        
        Color base_color = o.base_color_str != null ? new Color(Integer.parseInt(o.base_color_str,16)) : null;
        
        if (o.columnName_x.length() > 0) {
            Column x_column = project.columnModel.getColumnByName(o.columnName_x);
            if (x_column != null) {
                columnIndex_x = x_column.getCellIndex();
            }
        } else {
            columnIndex_x = -1;
        }
        
        try {
            eval_x = MetaParser.parse(o.expression_x);
        } catch (ParsingException e) {
            logger.warn("error parsing expression", e);
        }
        
        if (o.columnName_y.length() > 0) {
            Column y_column = project.columnModel.getColumnByName(o.columnName_y);
            if (y_column != null) {
                columnIndex_y = y_column.getCellIndex();
            }
        } else {
            columnIndex_y = -1;
        }
        
        try {
            eval_y = MetaParser.parse(o.expression_y);
        } catch (ParsingException e) {
            logger.warn("error parsing expression", e);
        }
        
        NumericBinIndex index_x = null;
        NumericBinIndex index_y = null;
        
        Column column_x = project.columnModel.getColumnByName(o.columnName_x);
        if (column_x != null) {
            columnIndex_x = column_x.getCellIndex();
            index_x = ScatterplotFacet.getBinIndex(project, column_x, eval_x, o.expression_x);
            min_x = index_x.getMin();
            max_x = index_x.getMax();
        }

        Column column_y = project.columnModel.getColumnByName(o.columnName_y);
        if (column_y != null) {
            columnIndex_y = column_y.getCellIndex();
            index_y = ScatterplotFacet.getBinIndex(project, column_y, eval_y, o.expression_y);
            min_y = index_y.getMin();
            max_y = index_y.getMax();
        }
        
        if (index_x != null && index_y != null && index_x.isNumeric() && index_y.isNumeric()) {
            ScatterplotDrawingRowVisitor drawer = new ScatterplotDrawingRowVisitor(
                columnIndex_x, columnIndex_y, min_x, max_x, min_y, max_y, 
                o.size, o.dim_x, o.dim_y, o.rotation, o.dot, color
            );
            
            if (base_color != null) {
                drawer.setColor(base_color);
                
                FilteredRows filteredRows = engine.getAllRows();
                filteredRows.accept(project, drawer);
                
                drawer.setColor(color);
            }
            
            {
                FilteredRows filteredRows = engine.getAllFilteredRows();
                filteredRows.accept(project, drawer);
            }
            
            ImageIO.write(drawer.getImage(), "png", output);
        } else {
            ImageIO.write(new BufferedImage(1, 1, BufferedImage.TYPE_4BYTE_ABGR), "png", output);
        }
        
    }
    
}
