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/*
* Fabric3
* Copyright (c) 2009-2013 Metaform Systems
*
* Fabric3 is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as
* published by the Free Software Foundation, either version 3 of
* the License, or (at your option) any later version, with the
* following exception:
*
* Linking this software statically or dynamically with other
* modules is making a combined work based on this software.
* Thus, the terms and conditions of the GNU General Public
* License cover the whole combination.
*
* As a special exception, the copyright holders of this software
* give you permission to link this software with independent
* modules to produce an executable, regardless of the license
* terms of these independent modules, and to copy and distribute
* the resulting executable under terms of your choice, provided
* that you also meet, for each linked independent module, the
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* extend this exception to your version of the software, but
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* Fabric3 is distributed in the hope that it will be useful,
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package org.fabric3.implementation.junit.introspection;

import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Set;

import org.fabric3.model.type.component.ServiceDefinition;
import org.fabric3.model.type.contract.DataType;
import org.fabric3.model.type.contract.Operation;
import org.fabric3.model.type.contract.ServiceContract;
import org.fabric3.spi.introspection.IntrospectionContext;
import org.fabric3.spi.introspection.java.HeuristicProcessor;
import org.fabric3.spi.introspection.java.IntrospectionHelper;
import org.fabric3.spi.introspection.java.annotation.PolicyAnnotationProcessor;
import org.fabric3.spi.introspection.java.contract.JavaContractProcessor;
import org.fabric3.spi.model.type.java.InjectingComponentType;
import org.fabric3.spi.model.type.java.JavaClass;
import org.fabric3.spi.model.type.java.JavaServiceContract;
import org.junit.Test;
import org.oasisopen.sca.annotation.Reference;

/**
 *
 */
public class JUnitServiceHeuristic implements HeuristicProcessor {
    private static final String TEST_SERVICE_NAME = "testService";
    private static final List> INPUT_TYPE = Collections.emptyList();
    private static final JavaClass OUTPUT_TYPE = new JavaClass(void.class);
    private static final List> FAULT_TYPE = Collections.emptyList();

    private IntrospectionHelper helper;
    private JavaContractProcessor contractProcessor;
    private PolicyAnnotationProcessor policyProcessor;

    public JUnitServiceHeuristic(@Reference IntrospectionHelper helper, @Reference JavaContractProcessor contractProcessor) {
        this.helper = helper;
        this.contractProcessor = contractProcessor;
    }

    @Reference
    public void setPolicyProcessor(PolicyAnnotationProcessor processor) {
        this.policyProcessor = processor;
    }

    public void applyHeuristics(InjectingComponentType componentType, Class implClass, IntrospectionContext context) {

        JavaServiceContract testContract = generateTestContract(implClass);
        ServiceDefinition testService = new ServiceDefinition(TEST_SERVICE_NAME, testContract);
        componentType.add(testService);
        // if the class implements a single interface, use it, otherwise the contract is the class itself
        Set> interfaces = helper.getImplementedInterfaces(implClass);
        if (interfaces.size() > 1) {
            for (Class interfaze : interfaces) {
                if (interfaze.getCanonicalName().endsWith("Test")) {
                    continue;
                }
                ServiceDefinition serviceDefinition = createServiceDefinition(interfaze, componentType, context);
                componentType.add(serviceDefinition);
            }
        }
    }

    @SuppressWarnings({"unchecked"})
    private ServiceDefinition createServiceDefinition(Class serviceInterface, InjectingComponentType componentType, IntrospectionContext context) {
        ServiceContract contract = contractProcessor.introspect(serviceInterface, context, componentType);
        ServiceDefinition definition = new ServiceDefinition(contract.getInterfaceName(), contract);
        Annotation[] annotations = serviceInterface.getAnnotations();
        if (policyProcessor != null) {
            for (Annotation annotation : annotations) {
                policyProcessor.process(annotation, definition, context);
            }
        }
        return definition;
    }

    private JavaServiceContract generateTestContract(Class implClass) {
        List operations = new ArrayList();
        for (Method method : implClass.getMethods()) {
            // see if this is a test method
            if (Modifier.isStatic(method.getModifiers())) {
                continue;
            }
            if (method.getReturnType() != void.class) {
                continue;
            }
            if (method.getParameterTypes().length != 0) {
                continue;
            }
            String name = method.getName();
            if (!method.isAnnotationPresent(Test.class) && (name.length() < 5 || !name.startsWith("test"))) {
                continue;
            }
            Operation operation = new Operation(name, INPUT_TYPE, OUTPUT_TYPE, FAULT_TYPE);
            operations.add(operation);
        }
        JavaServiceContract contract = new JavaServiceContract(implClass);
        contract.setOperations(operations);
        return contract;
    }
}