package com.framsticks.framclipse.ui.contentassist;

import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

import org.eclipse.jface.viewers.StyledString;
import org.eclipse.jface.viewers.StyledString.Styler;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.TextStyle;
import org.eclipse.swt.widgets.Display;

public class HTMLDescriptorProvider implements DescriptorProvider {

	private static final Styler LEFT_STYLER = new ColorStyler(SWT.COLOR_BLACK);
	private static final Styler RIGHT_STYLER = new ColorStyler(SWT.COLOR_DARK_GRAY);
	private static final String INDENT = "<pre>			</pre>";

	@Override
	public StyledString display(String string) {
		int pointcut = string.indexOf(':');
		if (pointcut < 0) {
			return new StyledString(string, LEFT_STYLER);
		} else {
			StyledString display = new StyledString(string.substring(0, pointcut), LEFT_STYLER);
			display.append(string.substring(pointcut, string.length()), RIGHT_STYLER);
			return display;
		}
	}

	@Override
	public String description(Map<String, String> description) {
		StringBuilder builder = new StringBuilder();
		Set<Entry<String, String>> set = description.entrySet();
		for (Entry<String, String> entry : set) {
			builder.append(wrap(entry.getKey(), entry.getValue()));
		}
		return builder.toString();
	}

	private String wrap(String name, String content) {
		if (name != null && content != null && content.length() > 0) {
			String[] split = content.split("\n");
			return "<b>" + name + ":</b><br/>" + indent(split);
		} else {
			return "";
		}
	}

	private String indent(String... content) {
		StringBuilder builder = new StringBuilder();
		for (String string : content) {
			builder.append(INDENT).append(string).append("<br/>");
		}
		return builder.toString();
	}

	private static class ColorStyler extends Styler {

		private final int color;

		public ColorStyler(int color) {
			this.color = color;
		}

		@Override
		public void applyStyles(TextStyle textStyle) {
			textStyle.foreground = Display.getCurrent().getSystemColor(color);
		}

	}

}