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package Torello.HTML.Tools.NewsSite;

import Torello.HTML.HTMLNode;
import Torello.HTML.URLFilter;

import Torello.Java.ParallelArrayException;

import java.util.Vector;
import java.net.URL;

class Branch 
{
    public static ArticleGet generate(URLFilter[] urlSelectors, ArticleGet[] getters)
    {
        // *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
        // FAIL-FAST: Check user-input for possible errors BEFORE building the Lambda-Function.
        // *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***

        if (urlSelectors.length == 0) throw new IllegalArgumentException
            ("parameter 'urlSelectors' had zero-elements.");

        if (getters.length == 0) throw new IllegalArgumentException
            ("parameter 'getters' had zero-elements.");

        ParallelArrayException.check(urlSelectors, "urlSelectors", true, getters, "getters", true);


        // *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
        // Build the instance, using a lambda-expression
        // *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***

        return (URL url, Vector<HTMLNode> page) ->
        {
            for (int i=0; i < urlSelectors.length; i++)
                if (urlSelectors[i].test(url))
                    return getters[i].apply(url, page);

            throw new ArticleGetException(
                "None of the urlSelecctors you have provided matched the URL sent to this " +
                "instance of ArticleGet."
            );
        };            
    }

}