package org.simantics.scl.compiler.markdown.nodes;

import org.simantics.scl.compiler.markdown.inlines.Entities;
import org.simantics.scl.compiler.markdown.inlines.Subject;

public class Reference {
    public final String label;
    public final String url;
    public final String title;
    
    public Reference(String label, String url, String title) {
        this.label = label;
        this.url = url;
        this.title = title;
    }
    
    public static String normalizeLabel(String label) {
        StringBuilder b = new StringBuilder();
        int pos = 0;
        while(pos < label.length() && Character.isWhitespace(label.charAt(pos)))
            ++pos;
        boolean ws = false;
        while(pos < label.length()) {
            char c = label.charAt(pos++);
            if(Character.isWhitespace(c))
                ws = true;
            else {
                if(ws)
                    b.append(' ');
                b.append(Character.toLowerCase(c));
            }
        }
        return b.toString();
    }
    
    public static String cleanUrl(String input) {
        StringBuilder b = new StringBuilder();
        int pos = 0;
        while(pos < input.length()) {
            char c = input.charAt(pos++);
            if(c == '\\' && pos < input.length()) {
                c = input.charAt(pos);
                if(Subject.getCharType(c) == 2) {
                    b.append(c);
                    ++pos;
                }
                else
                    b.append('\\');
            }
            else if(c == '&') {
                int maxPos = Math.min(input.length(), pos+Entities.MAX_ENTITY_LENGTH+1);
                int p = pos;
                while(true) {
                    if(p == maxPos) {
                        b.append("&");
                        break;
                    }
                    c = input.charAt(p++);
                    if(c == ';') {
                        String entity = input.substring(pos, p-1);
                        String character = Entities.ENTITY_MAP.get(entity);
                        if(character == null) {
                            b.append("&");
                            break;
                        }
                        else {
                            pos = p;
                            b.append(character);
                            break;
                        }
                    }
                }
            }
            else
                b.append(c);
        }
        return b.toString();
    }
    
    public static String cleanTitle(String input) {
        return cleanUrl(input);
    }
}