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package cucumber.runtime.java;

import cucumber.api.java.ObjectFactory;
import cucumber.runtime.CucumberException;

import java.lang.reflect.Constructor;
import java.util.HashMap;
import java.util.Map;

/**
 * This class has package scope so it doesn't get loaded by reflection,
 * thereby colliding with other DI implementations.
 */
class DefaultJavaObjectFactory implements ObjectFactory {
    private final Map, Object> instances = new HashMap, Object>();

    public void start() {
        // No-op
    }

    public void stop() {
        instances.clear();
    }

    public boolean addClass(Class clazz) {
        return true;
    }

    public  T getInstance(Class type) {
        T instance = type.cast(instances.get(type));
        if (instance == null) {
            instance = cacheNewInstance(type);
        }
        return instance;
    }

    private  T cacheNewInstance(Class type) {
        try {
            Constructor constructor = type.getConstructor();
            T instance = constructor.newInstance();
            instances.put(type, instance);
            return instance;
        } catch (NoSuchMethodException e) {
            throw new CucumberException(String.format("%s doesn't have an empty constructor. If you need DI, put cucumber-picocontainer on the classpath", type), e);
        } catch (Exception e) {
            throw new CucumberException(String.format("Failed to instantiate %s", type), e);
        }
    }
}