package de.intevation.flys.utils;

import de.intevation.artifacts.common.utils.XMLUtils;
import de.intevation.flys.artifacts.model.MapserverStyle;
import de.intevation.flys.artifacts.model.MapserverStyle.Clazz;
import de.intevation.flys.artifacts.model.MapserverStyle.Expression;
import de.intevation.flys.artifacts.model.MapserverStyle.Label;
import de.intevation.flys.artifacts.model.MapserverStyle.Style;

import java.awt.Color;
import java.awt.Font;

import javax.xml.xpath.XPathConstants;

import org.apache.log4j.Logger;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;


/**
 * Utility to deal with themes and their representations.
 */
public class ThemeUtil {

    private static Logger logger =
            Logger.getLogger(ThemeUtil.class);

    public final static String XPATH_FILL_COLOR =
            "/theme/field[@name='fillcolor']/@default";

    public final static String XPATH_LINE_COLOR =
            "/theme/field[@name='linecolor']/@default";

    public static final String XPATH_LINE_SIZE =
            "/theme/field[@name='linesize']/@default";

    public static final String XPATH_LINE_STYLE =
            "/theme/field[@name='linetype']/@default";

    public static final String XPATH_POINT_SIZE =
            "/theme/field[@name='pointsize']/@default";

    public static final String XPATH_POINT_COLOR =
            "/theme/field[@name='pointcolor']/@default";

    public final static String XPATH_SHOW_BORDER =
            "/theme/field[@name='showborder']/@default";

    public final static String XPATH_SHOW_POINTS =
            "/theme/field[@name='showpoints']/@default";

    public final static String XPATH_SHOW_LINE =
            "/theme/field[@name='showlines']/@default";

    public final static String XPATH_SHOW_VERTICAL_LINE =
            "/theme/field[@name='showverticalline']/@default";

    public final static String XPATH_SHOW_HORIZONTAL_LINE =
            "/theme/field[@name='showhorizontalline']/@default";

    public final static String XPATH_SHOW_LINE_LABEL =
            "/theme/field[@name='showlinelabel']/@default";

    public final static String XPATH_SHOW_POINT_LABEL =
            "/theme/field[@name='showpointlabel']/@default";

    public final static String XPATH_SHOW_WIDTH =
            "/theme/field[@name='showwidth']/@default";

    public final static String XPATH_SHOW_LEVEL =
            "/theme/field[@name='showwidth']/@default";

    public final static String XPATH_TRANSPARENCY =
            "/theme/field[@name='transparent']/@default";

    public final static String XPATH_TRANSPARENCY_ALPHA =
            "/theme/field[@name='alpha']/@default";

    public final static String XPATH_SHOW_AREA =
            "/theme/field[@name='showarea']/@default";

    public final static String XPATH_SHOW_MIDDLE_HEIGHT =
            "/theme/field[@name='showmiddleheight']/@default";

    public final static String XPATH_LABEL_FONT_COLOR =
            "/theme/field[@name='labelfontcolor']/@default";

    public final static String XPATH_LABEL_FONT_SIZE =
            "/theme/field[@name='labelfontsize']/@default";

    public final static String XPATH_LABEL_FONT_FACE =
            "/theme/field[@name='labelfontface']/@default";

    public final static String XPATH_LABEL_FONT_STYLE =
            "/theme/field[@name='labelfontstyle']/@default";

    public final static String XPATH_TEXT_ORIENTATION =
            "/theme/field[@name='textorientation']/@default";

    public final static String XPATH_LABEL_BGCOLOR =
            "/theme/field[@name='labelbgcolor']/@default";

    public final static String XPATH_LABEL_SHOW_BACKGROUND =
            "/theme/field[@name='labelshowbg']/@default";

    public final static String XPATH_BACKGROUND_COLOR =
            "/theme/field[@name='backgroundcolor']/@default";

    public final static String XPATH_SYMBOL =
            "/theme/field[@name='symbol']/@default";

    public final static String XPATH_SHOW_MINIMUM =
            "/theme/field[@name='showminimum']/@default";

    public final static String XPATH_SHOW_MAXIMUM =
            "/theme/field[@name='showmaximum']/@default";

    public final static String XPATH_WSPLGEN_FIELDS =
            "/theme[@name='WSPLGEN']/field";

    /** XPATH to bandwidth field. */
    public final static String XPATH_BANDWIDTH =
            "/theme/field[@name='bandwidth']/@default";


    /** Parse string to be boolean with default if empty or unrecognized. */
    public static boolean parseBoolean(String value, boolean defaultsTo) {
        if (value == null || value.length() == 0) {
            return defaultsTo;
        }
        if (value.equals("false")) {
            return false;
        }
        else if (value.equals("true")) {
            return true;
        }
        else {
            return defaultsTo;
        }
    }


    /**
     * Attempt converting \param value to an integer, in failing cases,
     * return \param defaultsTo.
     * @param value String to be converted to integer.
     * @param defaultsTo Default to return if conversion failed.
     * @return \param value as integer or defaultsto if conversion failed.
     */
    public static int parseInteger(String value, int defaultsTo) {
        if (value == null || value.length() == 0) {
            return defaultsTo;
        }

        try {
            return Integer.parseInt(value);
        }
        catch (NumberFormatException nfe) {
            // do nothing
        }

        return defaultsTo;
    }


    /**
     * Attempt converting \param value to a double, in failing cases,
     * return \param defaultsTo.
     * @param value String to be converted to double.
     * @param defaultsTo Default to return if conversion failed.
     * @return \param value as integer or defaultsto if conversion failed.
     */
    public static double parseDouble(String value, double defaultsTo) {
        if (value == null || value.length() == 0) {
            return defaultsTo;
        }

        try {
            return Double.parseDouble(value);
        }
        catch (NumberFormatException nfe) {
            // do nothing
        }

        return defaultsTo;
    }


    /**
     * Parses line width, defaulting to 0.
     * @param theme the theme
     */
    public static int parseLineWidth(Document theme) {
        String size = XMLUtils.xpathString(theme, XPATH_LINE_SIZE, null);
        if (size == null || size.length() == 0) {
            return 0;
        }

        try {
            return Integer.parseInt(size);
        }
        catch (NumberFormatException nfe) {
            logger.warn("Unable to set line size from string: '" + size + "'");
        }
        return 0;
    }


    /**
     * Parse band width, defaulting to 0.
     * @param theme the theme.
     */
    public static double parseBandWidth(Document theme) {
        String bandWidth = XMLUtils.xpathString(theme, XPATH_BANDWIDTH, null);

        return parseDouble(bandWidth, 0);
    }


    public static int parsePointWidth(Document theme) {
        String width = XMLUtils.xpathString(theme, XPATH_POINT_SIZE, null);

        return parseInteger(width, 3);
    }


    public static Color parsePointColor(Document theme) {
        String color = XMLUtils.xpathString(theme, XPATH_POINT_COLOR, null);
        logger.debug("parsePointColor(): color = " + color);
        return parseColor(color);
    }


    /**
     * Parses the line style, defaulting to '10'.
     * @param theme The theme.
     */
    public static float[] parseLineStyle(Document theme) {
        String dash = XMLUtils.xpathString(theme, XPATH_LINE_STYLE, null);

        float[] def = {10};
        if (dash == null || dash.length() == 0) {
            return def;
        }

        String[] pattern = dash.split(",");
        if(pattern.length == 1) {
            return def;
        }

        try {
            float[] dashes = new float[pattern.length];
            for (int i = 0; i < pattern.length; i++) {
                dashes[i] = Float.parseFloat(pattern[i]);
            }
            return dashes;
        }
        catch(NumberFormatException nfe) {
            logger.warn("Unable to set dash from string: '" + dash + "'");
            return def;
        }
    }


    /**
     * Parses text size, defaulting to 10.
     * @param theme The theme.
     */
    public static int parseTextSize(Document theme, String path) {
        String size = XMLUtils.xpathString(theme, path, null);
        if (size == null || size.length() == 0) {
            return 10;
        }

        try {
            return Integer.parseInt(size);
        }
        catch (NumberFormatException nfe) {
        }
        return 10;
    }


    public static int parseTextSize(Document theme) {
        return parseTextSize(theme, XPATH_LABEL_FONT_SIZE);
    }


    /**
     * Parses the attribute 'showpoints', defaults to false.
     * @param theme The theme.
     */
    public static boolean parseShowPoints(Document theme) {
        String show = XMLUtils.xpathString(theme, XPATH_SHOW_POINTS, null);
        return parseBoolean(show, false);
    }

    /**
     * Parses the attribute 'showmiddleheight', defaults to false.
     * @param theme The theme.
     */
    public static boolean parseShowMiddleHeight(Document theme) {
        String show = XMLUtils.xpathString(theme, XPATH_SHOW_MIDDLE_HEIGHT, null);
        return parseBoolean(show, false);
    }

    /**
     * Parses the attribute 'showarea', defaults to false.
     * @param theme The theme.
     */
    public static boolean parseShowArea(Document theme) {
        String show = XMLUtils.xpathString(theme, XPATH_SHOW_AREA, null);
        return parseBoolean(show, false);
    }

    /**
     * Parses the attribute 'showverticalline', defaults to true.
     * @param theme The theme.
     */
    public static boolean parseShowVerticalLine(Document theme) {
        String show = XMLUtils.xpathString(theme, XPATH_SHOW_VERTICAL_LINE, null);
        return parseBoolean(show, true);
    }

    /**
     * Parses the attribute 'showhorizontalline', defaults to true.
     * @param theme The theme.
     */
    public static boolean parseShowHorizontalLine(Document theme) {
        String show = XMLUtils.xpathString(theme, XPATH_SHOW_HORIZONTAL_LINE, null);
        return parseBoolean(show, true);
    }

    /**
     * Parses the attribute 'showlines', defaults to true.
     * @param theme The theme.
     */
    public static boolean parseShowLine(Document theme) {
        String show = XMLUtils.xpathString(theme, XPATH_SHOW_LINE, null);
        return parseBoolean(show, true);
    }

    /**
     * Parses the attribute 'showlinelabel', defaults to true.
     * @param theme The theme.
     */
    public static boolean parseShowLineLabel(Document theme) {
        String show = XMLUtils.xpathString(theme, XPATH_SHOW_LINE_LABEL, null);
        return parseBoolean(show, false);
    }

    public static boolean parseShowPointLabel(Document theme) {
        String show = XMLUtils.xpathString(theme, XPATH_SHOW_POINT_LABEL, null);
        return parseBoolean(show, false);
    }

    /**
     * Parses text color.
     * @param theme The theme.
     */
    public static Color parseTextColor(Document theme) {
        return parseRGB(getTextColorString(theme));
    }


    /**
     * Parses the font.
     * @param theme The theme.
     */
    public static Font parseTextFont(Document theme) {
        String font = XMLUtils.xpathString(theme, XPATH_LABEL_FONT_FACE, null);
        if (font == null || font.length() == 0) {
            return null;
        }

        int size = parseTextSize(theme);
        int style = parseTextStyle(theme);
        Font f = new Font (font, style, size);
        return f;
    }


    /**
     * Parses the text style, defaults to 'Font.PLAIN'.
     * @param theme The theme.
     */
    public static int parseTextStyle(Document theme, String path) {
        String style = XMLUtils.xpathString(theme, path, null);
        if (style == null || style.length() == 0) {
            return Font.PLAIN;
        }

        if (style.equals("italic")) {
            return Font.ITALIC;
        }
        else if (style.equals("bold")) {
            return Font.BOLD;
        }
        else {
            return Font.PLAIN;
        }
    }


    public static int parseTextStyle(Document theme) {
        return parseTextStyle(theme, XPATH_LABEL_FONT_STYLE);
    }


    public static boolean parseShowWidth(Document theme) {
        String show = XMLUtils.xpathString(theme, XPATH_SHOW_WIDTH, null);
        return parseBoolean(show, false);
    }


    public static boolean parseShowLevel(Document theme) {
        String show = XMLUtils.xpathString(theme, XPATH_SHOW_LEVEL, null);
        return parseBoolean(show, false);
    }

    /**
     * Parses the textorientation, defaults to 'vertical'.
     * @param theme The theme.
     */
    public static String parseTextOrientation(Document theme) {
        String o = XMLUtils.xpathString(theme, XPATH_TEXT_ORIENTATION, null);
        if ("true".equals(o)) {
            return "horizontal";
        }
        else {
            return "vertical";
        }
    }


    /**
     * Parses the text background color, defaults to white.
     * @param theme The theme.
     */
    public static Color parseTextBackground(Document theme) {
        String color = getLabelBackgroundColorString(theme);
        if (color == null || color.length() == 0) {
            return Color.WHITE;
        }
        return parseRGB(color);
    }


    /**
     * Parses the attribute whether to show background or not, defaults to
     * false.
     * @param theme The theme.
     */
    public static boolean parseLabelShowBackground(Document theme) {
        String show = XMLUtils.xpathString(theme, XPATH_LABEL_SHOW_BACKGROUND, null);
        return parseBoolean(show, false);
    }


    public static Color parseColor(String colorString) {
        if (colorString == null || colorString.length() == 0) {
            return null;
        }
        else if (colorString.indexOf("#") == 0) {
            return parseHexColor(colorString);
        }
        else if (colorString.indexOf(",") >= 0) {
            return parseRGB(colorString);
        }

        return null;
    }


    /**
     * Parse a string like "#00CC22" and return the corresponding color.
     *
     * @param hex The hex color value.
     *
     * @return a Color or null, if <i>hex</i> is empty.
     */
    public static Color parseHexColor(String hex) {
        if (hex == null) {
            return null;
        }

        return Color.decode(hex);
    }

    /**
     * Parse a string like "103, 100, 0" and return a corresping color.
     * @param rgbtext Color as string representation, e.g. "255,0,20".
     * @return Color, null in case of issues.
     */
    public static Color parseRGB(String rgbtext) {
        if (rgbtext == null) {
            return null;
        }
        String rgb[] = rgbtext.split(",");
        Color c = null;
        try {
            c = new Color(
                    Integer.parseInt(rgb[0].trim()),
                    Integer.parseInt(rgb[1].trim()),
                    Integer.parseInt(rgb[2].trim()));
        }
        catch (NumberFormatException nfe) {
            c = null;
        }
        return c;
    }


    public static String getLineColorString(Document theme) {
        return XMLUtils.xpathString(theme, XPATH_LINE_COLOR, null);
    }


    /** Get show border as string. */
    public static String getShowBorderString(Document theme) {
        return XMLUtils.xpathString(theme, XPATH_SHOW_BORDER, null);
    }


    /** Get fill color as string. */
    public static String getFillColorString(Document theme) {
        return XMLUtils.xpathString(theme, XPATH_FILL_COLOR, null);
    }


    public static String getLabelBackgroundColorString(Document theme) {
        return XMLUtils.xpathString(theme, XPATH_LABEL_BGCOLOR, null);
    }


    public static String getBackgroundColorString(Document theme) {
        return XMLUtils.xpathString(theme, XPATH_BACKGROUND_COLOR, null);
    }


    public static String getTextColorString(Document theme) {
        String textColor = XMLUtils.xpathString(theme, XPATH_LABEL_FONT_COLOR, null);
        return textColor;
    }


    public static String getSymbol(Document theme) {
        return XMLUtils.xpathString(theme, XPATH_SYMBOL, null);
    }


    public static String getTransparencyString(Document theme) {
        return XMLUtils.xpathString(theme, XPATH_TRANSPARENCY, null);
    }


    public static String getTransparencyAlpha(Document theme) {
        return XMLUtils.xpathString(theme, XPATH_TRANSPARENCY_ALPHA, null);
    }


    public static String getShowMinimum(Document theme) {
        return XMLUtils.xpathString(theme, XPATH_SHOW_MINIMUM, null);
    }


    public static String getShowMaximum(Document theme) {
        return XMLUtils.xpathString(theme, XPATH_SHOW_MAXIMUM, null);
    }


    /**
     * Gets color from color field.
     * @param theme    the theme document.
     * @return color.
     */
    public static Color parseFillColorField(Document theme) {
        return parseRGB(getFillColorString(theme));
    }


    public static boolean parseShowBorder(Document theme) {
        return parseBoolean(getShowBorderString(theme), false);
    }


    public static boolean parseTransparency(Document theme) {
        return parseBoolean(getTransparencyString(theme), false);
    }


    /**
     * Gets color from color field.
     * @param theme    the theme document.
     * @return color.
     */
    public static Color parseLineColorField(Document theme) {
        String lineColorStr = getLineColorString(theme);
        logger.debug("parseLineColorField: lineColorStr = " +
                (lineColorStr == null ? "null" : lineColorStr));
        return parseRGB(lineColorStr);
    }


    public static boolean parseShowMinimum(Document theme) {
        return parseBoolean(getShowMinimum(theme), false);
    }


    public static boolean parseShowMaximum(Document theme) {
        return parseBoolean(getShowMaximum(theme), false);
    }


    public static String createWSPLGENStyle(Document theme) {
        NodeList categories = (NodeList) XMLUtils.xpath(
                theme,
                XPATH_WSPLGEN_FIELDS,
                XPathConstants.NODESET);

        return createWSPLGENStyle(categories).toString();
    }

    protected static MapserverStyle createWSPLGENStyle(NodeList categories) {
        MapserverStyle ms = new MapserverStyle();

        for (int i = 0, n = categories.getLength(); i < n; i++) {
            Element  cat = (Element) categories.item(i);
            String color = cat.getAttribute("default");
            String name  = cat.getAttribute("name");

            String expr;

            try {
                int length = name.length();
                int idx    = Integer.parseInt(name.substring(length-1, length));

                expr = createWSPLGENExpression(idx);
            }
            catch (NumberFormatException nfe) {
                logger.warn("Error while parsing WSPLGEN category.", nfe);
                continue;
            }

            Clazz      c = new Clazz(expr);
            Style      s = new Style();
            s.setColor(color.replace(",", ""));
            s.setSize(5);

            c.addItem(new Expression("(" + expr + ")"));
            c.addItem(s);

            ms.addClazz(c);
        }

        return ms;
    }


    protected static String createWSPLGENExpression(int idx) {
        if (idx < 5) {
            int lower = idx - 1;
            return "[DIFF] >= " + lower + " AND  [DIFF] < " + idx;
        }
        else {
            return "[DIFF] >= 4";
        }
    }


    public static String createMapserverStyle(Document theme) {
        String symbol    = getSymbol(theme);
        String backcolor = getLabelBackgroundColorString(theme);
        String linecolor = getLineColorString(theme);

        int linewidth = parseLineWidth(theme);

        MapserverStyle ms = new MapserverStyle();

        Clazz c = new Clazz(" ");

        Style s = new Style();
        s.setOutlineColor(linecolor.replace(",", ""));

        if (backcolor != null && backcolor.length() > 0) {
            s.setColor(backcolor.replace(",", ""));
        }

        s.setSize(linewidth);
        s.setSymbol(symbol);
        c.addItem(s);

        String textcolor = getTextColorString(theme);
        int    textsize  = parseTextSize(theme);

        if (textcolor != null && textcolor.length() > 0 && textsize > 0) {
            Label l = new Label();
            l.setColor(textcolor.replace(",", ""));
            l.setSize(textsize);
            c.addItem(l);
        }

        ms.addClazz(c);

        return ms.toString();
    }
}
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