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/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.crosstreelabs.junited.core;

import com.crosstreelabs.junited.core.annotation.Features;
import com.crosstreelabs.junited.core.execution.Unit;
import com.crosstreelabs.junited.core.features.TestCaseFeature;
import java.lang.annotation.Annotation;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import org.junit.internal.AssumptionViolatedException;
import org.junit.internal.runners.model.EachTestNotifier;
import org.junit.runner.Description;
import org.junit.runner.Runner;
import org.junit.runner.notification.RunNotifier;
import org.junit.runner.notification.StoppedByUserException;
import org.junit.runners.model.Statement;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class FeatureRunner extends Runner {
    private static final Logger LOGGER = LoggerFactory.getLogger(FeatureRunner.class);
    
    protected final Class klass;
    protected final List features = new ArrayList<>();
    protected final Set children = new HashSet<>();

    public FeatureRunner(final Class klass) {
        this.klass = klass;
        if (!klass.isAnnotationPresent(Features.class)) {
            features.add(new TestCaseFeature(klass));
            return;
        }
        Features features = klass.getAnnotation(Features.class);
        for (Class feature: features.value()) {
            this.features.add(instantiateFeature(feature));
        }
        if (this.features.isEmpty()) {
            this.features.add(new TestCaseFeature(klass));
        }
    }

    @Override
    public Description getDescription() {
        Description description = Description.createSuiteDescription(klass.getName(),
                klass.getAnnotations());
        for (Object child : getChildren()) {
            description.addChild(describeChild(child));
        }
        return description;
    }
    
    public Description describeChild(final Object child) {
        return Description.createTestDescription(klass,
                child.toString(), new Annotation[0]);
    }
    
    public Set getChildren() {
        if (!children.isEmpty()) {
            return children;
        }
        Set children = new HashSet<>();
        for (Feature f : features) {
            children = f.getChildren(children);
        }
        this.children.addAll(children);
        return this.children;
    }

    @Override
    public void run(final RunNotifier notifier) {
        LOGGER.debug("run");
        EachTestNotifier testNotifier = new EachTestNotifier(notifier,
                getDescription());
        try {
            Statement statement = classBlock(notifier);
            statement.evaluate();
        } catch (AssumptionViolatedException e) {
            testNotifier.fireTestIgnored();
        } catch (StoppedByUserException e) {
            throw e;
        } catch (Throwable e) {
            testNotifier.addFailure(e);
        }
    }
    protected Statement classBlock(final RunNotifier notifier) {
        LOGGER.debug("classBlock");
        Statement statement = childrenInvoker(notifier);
//        statement = withBeforeClasses(statement);
//        statement = withAfterClasses(statement);
//        statement = withClassRules(statement);
        return statement;
    }
    protected Statement childrenInvoker(final RunNotifier notifier) {
        LOGGER.debug("childrenInvoker");
        return new Statement() {
            @Override
            public void evaluate() {
                runChildren(notifier);
            }
        };
    }
    private void runChildren(final RunNotifier notifier) {
        LOGGER.debug("runChildren");
        for (Unit child : getChildren()) {
            FeatureRunner.this.runChild(child, notifier);
        }
    }
    protected void runChild(Unit child, RunNotifier notifier) {
        child.run(notifier);
    }
    
    protected Feature instantiateFeature(final Class cls) {
        try {
            try {
                Constructor constructor = cls.getConstructor(Class.class);
                return constructor.newInstance(klass);
            } catch (NoSuchMethodException | SecurityException | InstantiationException | IllegalAccessException | IllegalArgumentException | InvocationTargetException ex) {
                LOGGER.warn("{} while try to find constructor(class) for {}", ex.getClass().getSimpleName(), cls.getCanonicalName());
            }
            return cls.newInstance();
        } catch (InstantiationException | IllegalAccessException ex) {
            throw new RuntimeException(ex);
        }
    }
    
}