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package cucumber.runtime.java.spring;

import cucumber.runtime.CucumberException;
import cucumber.runtime.java.ObjectFactory;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.context.support.GenericApplicationContext;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.ContextHierarchy;
import org.springframework.test.context.TestContextManager;

import java.lang.annotation.Annotation;
import java.util.Collection;
import java.util.HashSet;

/**
 * Spring based implementation of ObjectFactory.
 * 
 * 

 * 

 * It uses TestContextManager to manage the spring context.
 * Configuration via: @ContextConfiguration or @ContextHierarcy
 * At least on step definition class needs to have a @ContextConfiguration or
 * @ContextHierarchy annotation. If more that one step definition class has such
 * an annotation, the annotations must be equal on the different step definition
 * classes. If no step definition class with @ContextConfiguration or
 * @ContextHierarcy is found, it will try to load cucumber.xml from the classpath.
 * 
 * The step definitions class with @ContextConfiguration or @ContextHierarchy
 * annotation, may also have a @WebAppConfiguration or @DirtiesContext annotation.
 * 
 * The step definitions added to the TestContextManagers context and
 * is reloaded for each scenario.
 * 
 * 
 * 
 * 

 * Application beans are accessible from the step definitions using autowiring
 * (with annotations).
 * 
 */
public class SpringFactory implements ObjectFactory {

    private ConfigurableListableBeanFactory beanFactory;
    private CucumberTestContextManager testContextManager;

    private final Collection> stepClasses = new HashSet>();
    private Class stepClassWithSpringContext = null;

    public SpringFactory() {
    }

    @Override
    public void addClass(final Class stepClass) {
        if (!stepClasses.contains(stepClass)) {
            if (dependsOnSpringContext(stepClass)) {
                if (stepClassWithSpringContext == null) {
                    stepClassWithSpringContext = stepClass;
                } else {
                    checkAnnotationsEqual(stepClassWithSpringContext, stepClass);
                }
            }
            stepClasses.add(stepClass);

        }
    }

    private void checkAnnotationsEqual(Class stepClassWithSpringContext, Class stepClass) {
        Annotation[] annotations1 = stepClassWithSpringContext.getAnnotations();
        Annotation[] annotations2 = stepClass.getAnnotations();
        if (annotations1.length != annotations2.length) {
            throw new CucumberException("Annotations differs on glue classes found: " +
                    stepClassWithSpringContext.getName() + ", " +
                    stepClass.getName());
        }
        for (Annotation annotation : annotations1) {
            if (!isAnnotationInArray(annotation, annotations2)) {
                throw new CucumberException("Annotations differs on glue classes found: " +
                        stepClassWithSpringContext.getName() + ", " +
                        stepClass.getName());
            }
        }
    }

    private boolean isAnnotationInArray(Annotation annotation, Annotation[] annotations) {
        for (Annotation annotationFromArray: annotations) {
            if (annotation.equals(annotationFromArray)) {
                return true;
            }
        }
        return false;
    }

    @Override
    public void start() {
        if (stepClassWithSpringContext != null) {
            testContextManager = new CucumberTestContextManager(stepClassWithSpringContext);
        } else {
            if (beanFactory == null) {
                beanFactory = createFallbackContext();
            }
        }
        notifyContextManagerAboutTestClassStarted();
        if (beanFactory == null || isNewContextCreated()) {
            beanFactory = testContextManager.getBeanFactory();
            for (Class stepClass : stepClasses) {
                registerStepClassBeanDefinition(beanFactory, stepClass);
            }
        }
        GlueCodeContext.INSTANCE.start();
    }

    @SuppressWarnings("resource")
    private ConfigurableListableBeanFactory createFallbackContext() {
        ConfigurableApplicationContext applicationContext;
        if (getClass().getClassLoader().getResource("cucumber.xml") != null) {
            applicationContext = new ClassPathXmlApplicationContext("cucumber.xml");
        } else {
            applicationContext = new GenericApplicationContext();
        }
        applicationContext.registerShutdownHook();
        ConfigurableListableBeanFactory beanFactory = applicationContext.getBeanFactory();
        beanFactory.registerScope(GlueCodeScope.NAME, new GlueCodeScope());
        for (Class stepClass : stepClasses) {
            registerStepClassBeanDefinition(beanFactory, stepClass);
        }
        return beanFactory;
    }

    private void notifyContextManagerAboutTestClassStarted() {
        if (testContextManager != null) {
            try {
                testContextManager.beforeTestClass();
            } catch (Exception e) {
                throw new CucumberException(e.getMessage(), e);
            }
        }
    }

    private boolean isNewContextCreated() {
        if (testContextManager == null) {
            return false;
        }
        return !beanFactory.equals(testContextManager.getBeanFactory());
    }

    private void registerStepClassBeanDefinition(ConfigurableListableBeanFactory beanFactory, Class stepClass) {
        BeanDefinitionRegistry registry = (BeanDefinitionRegistry) beanFactory;
        BeanDefinition beanDefinition = BeanDefinitionBuilder
                .genericBeanDefinition(stepClass)
                .setScope(GlueCodeScope.NAME)
                .getBeanDefinition();
        registry.registerBeanDefinition(stepClass.getName(), beanDefinition);
    }

    @Override
    public void stop() {
        notifyContextManagerAboutTestClassFinished();
        GlueCodeContext.INSTANCE.stop();
    }

    private void notifyContextManagerAboutTestClassFinished() {
        if (testContextManager != null) {
            try {
                testContextManager.afterTestClass();
            } catch (Exception e) {
                throw new CucumberException(e.getMessage(), e);
            }
        }
    }

    @Override
    public  T getInstance(final Class type) {
        try {
            return beanFactory.getBean(type);
        } catch (BeansException e) {
            throw new CucumberException(e.getMessage(), e);
        }
    }

    private boolean dependsOnSpringContext(Class type) {
        boolean hasStandardAnnotations = annotatedWithSupportedSpringRootTestAnnotations(type);

        if(hasStandardAnnotations) {
            return true;
        }

        final Annotation[] annotations = type.getDeclaredAnnotations();
        return (annotations.length == 1) && annotatedWithSupportedSpringRootTestAnnotations(annotations[0].annotationType());
    }

    private boolean annotatedWithSupportedSpringRootTestAnnotations(Class type) {
        return type.isAnnotationPresent(ContextConfiguration.class)
            || type.isAnnotationPresent(ContextHierarchy.class);
    }
}

class CucumberTestContextManager extends TestContextManager {

    public CucumberTestContextManager(Class testClass) {
        super(testClass);
        registerGlueCodeScope(getContext());
    }

    public ConfigurableListableBeanFactory getBeanFactory() {
        return getContext().getBeanFactory();
    }

    private ConfigurableApplicationContext getContext() {
        return (ConfigurableApplicationContext)getTestContext().getApplicationContext();
    }

    private void registerGlueCodeScope(ConfigurableApplicationContext context) {
        do {
            context.getBeanFactory().registerScope(GlueCodeScope.NAME, new GlueCodeScope());
            context = (ConfigurableApplicationContext)context.getParent();
        } while (context != null);
    }
}