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package com.liberologico.cloudesire.cmw.model.utils;

import org.apache.commons.lang3.StringUtils;

import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class BodyParser
{
    private BodyParser()
    {
    }

    /*
     Try to parse a generic Object looking for a resource id from a Map deserialized by Jackson
     */
    public static Integer parseMapEntry( Object o )
    {
        if ( o == null ) return null;
        if ( o instanceof Map )
        {
            Map map = (Map) o;
            if ( map.get( "url" ) instanceof String && StringUtils.isNotEmpty( (String) map.get( "url" ) ) )
            {
                return getResourceId( (String) map.get( "url" ) );
            }
        }
        if ( o instanceof Integer )
        {
            return (Integer) o;
        }
        if ( o instanceof String )
        {
            return getResourceId( (String) o );
        }
        throw new IllegalArgumentException( "Not a valid UrlEntity object" );
    }

    /*
     Parse a string like `product/id` returning the id if found
     */
    public static Integer getResourceId( String url )
    {
        if ( StringUtils.isEmpty(  url ) ) return null;
        Pattern pattern = Pattern.compile( "\\d+$" );
        Matcher match = pattern.matcher( url );
        if ( ! match.find() ) throw new IllegalArgumentException( "Invalid URL: " + url + "!" );
        return Integer.parseInt( url.subSequence( match.start(), match.end() ).toString() );
    }
}