package pt.ist.renderers.components;

import javax.servlet.jsp.PageContext;

import pt.ist.renderers.components.tags.HtmlTag;

public class HtmlText extends HtmlComponent {

    private String text;
    private boolean escaped;
    private boolean newLineAware;
    private Face face;
    
    public HtmlText(String text, boolean escaped) {
        this.text = text;
        this.escaped = escaped;
        this.newLineAware = escaped;
    }

    public HtmlText(String text, boolean escaped, boolean newLineAware) {
        this.text = text;
        this.escaped = escaped;
        this.newLineAware = newLineAware;
    }

    public HtmlText(String text) {
        this.text = text;
        this.escaped = true;
        this.newLineAware = true;
    }

    public HtmlText() {
        this.text = "";
    }

    public String getText() {
        return text;
    }

    public void setText(String text) {
        this.text = text;
    }

    public boolean isEscaped() {
        return this.escaped;
    }

    public void setEscaped(boolean escaped) {
        this.escaped = escaped;
    }

    public void setFace(Face face) {
    	this.face = face;
    }

    public Face getTextFace() {
    	return this.face;
    }
    
    @Override
    public HtmlTag getOwnTag(PageContext context) {
    	HtmlTag tag = super.getOwnTag(context);
    
    	if (tag.hasVisibleAttributes() || hasEffect()) {
    	    String tagName = getTagName();
			tag.setName(tagName == null ? "span" : tagName);
    	} else {
    	    tag.setName(null);
    	}
        
        if (this.text == null) {
            return tag;
        }
            
        String finalText = this.escaped ? escape(this.text) : this.text;
        finalText = this.newLineAware ? replaceNewlines(finalText) : finalText;
        
        tag.setText(finalText);
        
        return tag;
    }

	private boolean hasEffect() {
		return getTextFace() != null;
	}

    private String getTagName() {
    	if (getTextFace() == null) {
    		return null;
    	}
    	
    	switch (getTextFace()) {
    		case STANDARD: 	 return "span";
	    	case EMPHASIS:   return "em";
	    	case STRONG:     return "strong";
	    	case MONOSPACED: return "tt";
	    	case PARAGRAPH:	 return "p";
	    	case H1:         return "h1";
	    	case H2:         return "h2";
	    	case H3:         return "h3";
	    	case H4:         return "h4";
	    	default:
	    		return null;
    	}
	}

	private String replaceNewlines(String string) {
        StringBuilder result = new StringBuilder();
        
        String[] lines = string.split("\\r\\n|\\n|\\r", -1);
        for (int i = 0; i < lines.length; i++) {
            String line = lines[i];

            if (i > 0) {
                result.append("<br/>");
            }
            
            result.append(line);
        }
        
        return result.toString();
    }
    
    public static String escape(String text) {
        	return escape(text, true);
    }

    public static String escape(String text, boolean preserveSpaces) {
        if (text == null) {
            return null;
        }
    
        String result = text
            .replaceAll("&", "&amp;") // must appear first
            .replaceAll("<", "&lt;")
            .replaceAll(">", "&gt;")
            .replaceAll("\"", "&quot;");
        
        if (preserveSpaces) {
            return result.replaceAll("  ", " &nbsp;");
        }
        else {
            return result;
        }
    }
}