/*
 * Thanks to Bent Andre Solheim for the improved header rendering.
 */
package net.sourceforge.phpeclipse.wiki.renderer;

import java.io.IOException;
import java.io.StringWriter;

import net.sourceforge.phpeclipse.wiki.builder.BuilderRenderEngine;
import net.sourceforge.phpeclipse.wiki.editor.WikiEditorPlugin;

import org.eclipse.core.resources.IProject;
import org.radeox.api.engine.RenderEngine;
import org.radeox.api.engine.context.InitialRenderContext;
import org.radeox.engine.context.BaseInitialRenderContext;
import org.radeox.macro.MacroRepository;

public final class WikipediaContentRenderer extends AbstractContentRenderer {
  public static final String BULLET_MARKUP = "*";

  public static final String ALT_BULLET_MARKUP = "-";

  protected InitialRenderContext context;

  protected BuilderRenderEngine engine;

  protected void initialise() {

  }

  protected void appendHeader(String line) {
    String header = getHeaderText(line);
    String headerStartTag = "<h1 " + getHeaderCss(getHeaderSize(line)) + ">";
    getBuffer().append(headerStartTag);
    getBuffer().append(header);
    getBuffer().append("</h1>");
  }

  private int getHeaderSize(String line) {
    int size = 0;
    int index = 0;
    while (index < line.length() && line.charAt(index) != ' ') {
      if (line.charAt(index) == '1') {
        size++;
      }
      index++;
    }
    return size;
  }

  private String getHeaderCss(int size) {
    int max = Math.min(3, size);
    StringBuffer css = new StringBuffer();
    css.append("class=\"").append("heading");
    for (int i = 0; i < max; i++) {
      css.append("-1");
    }
    css.append("\"");
    return css.toString();
  }

  protected String getHeaderText(String line) {
    return line.substring(line.indexOf(' ')).trim();
  }

  protected int getListDepth(String line) {
    char bullet = getBullet(line);
    for (int i = 0; i < line.length(); i++) {
      if (line.charAt(i) != bullet) {
        return i;
      }
    }
    return line.length();
  }

  private char getBullet(String line) {
    char bullet = line.startsWith(WikipediaContentRenderer.BULLET_MARKUP) ? WikipediaContentRenderer.BULLET_MARKUP.charAt(0)
        : WikipediaContentRenderer.ALT_BULLET_MARKUP.charAt(0);
    return bullet;
  }

  protected boolean isHeader(String line) {
    return line.startsWith("1") && line.indexOf(' ') > 0;
  }

  protected boolean isList(String line) {
    return !line.trim().equals("----")
        && (line.startsWith(WikipediaContentRenderer.BULLET_MARKUP) || line.startsWith(WikipediaContentRenderer.ALT_BULLET_MARKUP));
  }

  protected boolean process(String line) {
    if (line.trim().matches("^----*$")) {
      appendHR();
      return true;
    }
    return false;
  }

  protected String processTags(String line) {
    line = line.replaceAll("\\\\", "<br>");
    line = extractMacroMarkup(line);
    line = replacePair(line, "__", "<b>", "</b>");
    line = replacePair(line, "~~", "<i>", "</i>");
    line = replacePair(line, "--", "<strike>", "</strike>");
    return line;
  }

  private String extractMacroMarkup(String line) {
    return line.replaceAll("\\{.*?\\}", "");
  }

  protected String getListtext(String line) {
    return line.substring(getListDepth(line)).trim();
  }

  protected String getTableTag() {
    return "<table class=\"wiki-table\" cellpadding=\"0\" cellspacing=\"0\" border=\"0\">";
  }

  public final void render(String content, StringBuffer buf, int level, boolean completeHTMLPage) {
    try {
      buffer = buf;
      if (completeHTMLPage) {
        appendHeader();
      }
      StringWriter writer = new StringWriter();
      try {
        engine.setLevel(level);
        engine.render(writer, content, context);
        buffer.append(writer);
      } catch (IOException e) {
        // never reach
      }
      if (completeHTMLPage) {
        appendFooter();
      }
      //	      return buffer.toString();
    } catch (Exception e) {
      WikiEditorPlugin.getDefault().log(buffer.toString());
      WikiEditorPlugin.getDefault().log(e.getLocalizedMessage(), e);
      //	      return "<html><body><p>" + e.getLocalizedMessage() + "</p></body></html>";
    }
  }

  /*
   * (non-Javadoc)
   * 
   * @see net.sourceforge.phpeclipse.wiki.renderer.IContentRenderer#setProject(org.eclipse.core.resources.IProject)
   */
  public void setProject(IProject project) {
    super.setProject(project);
    context = new BaseInitialRenderContext();
    engine = new BuilderRenderEngine(project, context);
    context.setRenderEngine(engine);
    MacroRepository repository = MacroRepository.getInstance();
    repository.setInitialContext(context);
  }
}