package walter;

import io.devnulllabs.openjava.ptree.*;
import io.devnulllabs.openjava.ptree.ModifierList;
import io.devnulllabs.openjava.mop.*;

public class multiTrig instantiates Metaclass extends OJClass {

    private static final String MULTI_TRIG = "multi_trig";
    private final int triggerValue = 10;

    public static boolean isRegisteredModifier(String keyword) {
        if (keyword.equals(MULTI_TRIG))
            return true;
        return OJClass.isRegisteredModifier(keyword);
    }

    public void translateDefinition() throws MOPException {
        OJMethod[] methods = getDeclaredMethods();
        for (int i = 0; i < methods.length; ++i) {
            if (!methods[i].getModifiers().has(MULTI_TRIG))
                continue;
            String name = methods[i].getName(); // is a multi-trigged method
            ModifierList ml = new ModifierList(ModifierList.PRIVATE);
            TypeName tn = new TypeName("int");
            /* inserts a field for counting the method calls
               private int <method name>Counter = 0         */
            String counterName = name + "Counter";
            VariableInitializer vi = Literal.makeLiteral(0);
            FieldDeclaration fd = new FieldDeclaration(ml, tn, counterName, vi);
            OJField field = new OJField(getEnvironment(), this, fd);
            addField(field);

            /* inserts a field keeping the trigger value
               private int <method name>Trigger = 10        */
            String triggerName = name + "Trigger";
            vi = Literal.makeLiteral(triggerValue);
            fd = new FieldDeclaration(ml, tn, triggerName, vi);
            field = new OJField(getEnvironment(), this, fd);
            addField(field);

            /* inserts a precondition on the execution of the method body
               if (<method name>Counter == <method name>Trigger) {
               and a post action
               <method body>
               <method name>Counter = 0;
               } <method name>Counter++;                                 */
            StatementList newBody =
                makeStatementList(
                    methods[i].getEnvironment(),
                    "if ("
                        + counterName
                        + " == "
                        + triggerName
                        + ") {"
                        + methods[i].getBody().toString()
                        + counterName
                        + "=0;}; "
                        + counterName
                        + "++;");
            methods[i].setBody(newBody);
        }
    }

}