// Ensure compatibility with both JDK 7 and 8 JSR-223 Script Engines
try { load("nashorn:mozilla_compat.js"); } catch(e) { }

// Import the interface required by the Script snap.
importPackage(com.snaplogic.scripting.language);

// Import the Java utility classes.
importPackage(java.util);

/**
 * Create an object that implements the methods defined by the "ScriptHook"
 * interface.  We'll be passing this object to the constructor for the
 * ScriptHook interface.
 */
var impl = {
    /*
     * These variables (input, output, error, log) are defined by the
     * ExecuteScript snap when evaluating this script.
     */
    input : input,
    output : output,
    error : error,
    log : log,

    /**
     * The "execute()" method is called once when the pipeline is started
     * and allowed to process its inputs or just send data to its outputs.
     *
     * Exceptions are automatically caught and sent to the error view.
     */
    execute : function () {
        var interfaceIds = new java.util.ArrayList();
        var interfaceParams = new java.util.ArrayList();
        while (this.input.hasNext()) {
            var doc = this.input.next();

            var interfaceId = doc.interface_id;
            var paramName = doc.param_name;
            var paramValue = doc.param_value;

            var index = -1;

            if(!interfaceIds.contains(interfaceId)) {
                interfaceIds.add(interfaceId);
                var interfaceMap = new java.util.LinkedHashMap();
                interfaceMap.put("interface_id", interfaceId);
                interfaceParams.add(interfaceMap);
            }

            index = interfaceIds.indexOf(interfaceId);
            if(index >= 0) {
                interfaceParams.get(index).put(paramName,paramValue);
            }
        }

        for(var i=0; i<interfaceParams.size(); i++) {
            this.output.write(interfaceParams.get(i));
        }
    }
};

/**
 * The Script Snap will look for a ScriptHook object in the "hook"
 * variable.  The snap will then call the hook's "execute" method.
 */
var hook = new com.snaplogic.scripting.language.ScriptHook(impl);