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package com.github.javaclub.configcenter.spring.annotation;

import java.beans.PropertyDescriptor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.Collection;
import java.util.Set;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.BeanFactoryAware;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.context.annotation.Bean;

import com.github.javaclub.configcenter.spring.property.PlaceholderHelper;
import com.github.javaclub.configcenter.spring.property.SpringValue;
import com.github.javaclub.configcenter.spring.property.SpringValueDefinition;
import com.github.javaclub.configcenter.spring.property.SpringValueDefinitionProcessor;
import com.github.javaclub.configcenter.spring.property.SpringValueRegistry;
import com.github.javaclub.configcenter.spring.utils.SpringInjector;
import com.google.common.collect.LinkedListMultimap;
import com.google.common.collect.Multimap;

/**
 * Spring value processor of field or method which has @Value and xml config placeholders.
 */
public class SpringValueProcessor extends ConfigProcessor implements BeanFactoryPostProcessor, BeanFactoryAware {

	private static final Logger logger = LoggerFactory.getLogger(SpringValueProcessor.class);

	private final PlaceholderHelper placeholderHelper;
	private final SpringValueRegistry springValueRegistry;

	private BeanFactory beanFactory;
	private Multimap beanName2SpringValueDefinitions;

	public SpringValueProcessor() {
		placeholderHelper = SpringInjector.getInstance(PlaceholderHelper.class);
		springValueRegistry = SpringInjector.getInstance(SpringValueRegistry.class);
		beanName2SpringValueDefinitions = LinkedListMultimap.create();
	}

	@Override
	public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
		if (beanFactory instanceof BeanDefinitionRegistry) {
			beanName2SpringValueDefinitions = SpringValueDefinitionProcessor.getBeanName2SpringValueDefinitions((BeanDefinitionRegistry) beanFactory);
		}
	}

	@Override
	public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
		super.postProcessBeforeInitialization(bean, beanName);
		processBeanPropertyValues(bean, beanName);
		return bean;
	}

	@Override
	protected void processField(Object bean, String beanName, Field field) {
		// register @Value on field
		Value value = field.getAnnotation(Value.class);
		if (value == null) {
			return;
		}
		Set keys = placeholderHelper.extractPlaceholderKeys(value.value());

		if (keys.isEmpty()) {
			return;
		}

		for (String key : keys) {
			SpringValue springValue = new SpringValue(key, value.value(), bean, beanName, field, false);
			springValueRegistry.register(beanFactory, key, springValue);
			logger.debug("Monitoring {}", springValue);
		}
	}

	@Override
	protected void processMethod(Object bean, String beanName, Method method) {
		// register @Value on method
		Value value = method.getAnnotation(Value.class);
		if (value == null) {
			return;
		}
		// skip Configuration bean methods
		if (method.getAnnotation(Bean.class) != null) {
			return;
		}
		if (method.getParameterTypes().length != 1) {
			logger.error("Ignore @Value setter {}.{}, expecting 1 parameter, actual {} parameters",
					bean.getClass().getName(), method.getName(), method.getParameterTypes().length);
			return;
		}

		Set keys = placeholderHelper.extractPlaceholderKeys(value.value());

		if (keys.isEmpty()) {
			return;
		}

		for (String key : keys) {
			SpringValue springValue = new SpringValue(key, value.value(), bean, beanName, method, false);
			springValueRegistry.register(beanFactory, key, springValue);
			logger.info("Monitoring {}", springValue);
		}
	}

	private void processBeanPropertyValues(Object bean, String beanName) {
		Collection propertySpringValues = beanName2SpringValueDefinitions.get(beanName);
		if (propertySpringValues == null || propertySpringValues.isEmpty()) {
			return;
		}

		for (SpringValueDefinition definition : propertySpringValues) {
			try {
				PropertyDescriptor pd = BeanUtils.getPropertyDescriptor(bean.getClass(), definition.getPropertyName());
				Method method = pd.getWriteMethod();
				if (method == null) {
					continue;
				}
				SpringValue springValue = new SpringValue(definition.getKey(), definition.getPlaceholder(), bean,
						beanName, method, false);
				springValueRegistry.register(beanFactory, definition.getKey(), springValue);
				logger.debug("Monitoring {}", springValue);
			} catch (Throwable ex) {
				logger.error("Failed to enable auto update feature for {}.{}", bean.getClass(),
						definition.getPropertyName());
			}
		}

		// clear
		beanName2SpringValueDefinitions.removeAll(beanName);
	}

	@Override
	public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
		this.beanFactory = beanFactory;
	}
}