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/*
 * Copyright (c) 2019-2029, Dreamlu ([email protected] & www.dreamlu.net).
 * 
 * Licensed under the GNU LESSER GENERAL PUBLIC LICENSE 3.0;
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 

 * http://www.gnu.org/licenses/lgpl.html
 * 

 * 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 net.dreamlu.mica.spider.mapper;

import lombok.RequiredArgsConstructor;
import net.dreamlu.mica.core.utils.ConvertUtil;
import net.dreamlu.mica.core.utils.StringUtil;
import org.jsoup.nodes.Element;
import org.jsoup.nodes.TextNode;
import org.jsoup.select.Elements;
import org.jsoup.select.Selector;
import org.springframework.beans.BeanUtils;
import org.springframework.cglib.proxy.MethodInterceptor;
import org.springframework.cglib.proxy.MethodProxy;
import org.springframework.core.ResolvableType;
import org.springframework.core.convert.TypeDescriptor;
import org.springframework.util.ReflectionUtils;

import javax.annotation.Nullable;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.stream.Collectors;

/**
 * 代理模型
 *
 * @author L.cm
 */
@RequiredArgsConstructor
public class CssQueryMethodInterceptor implements MethodInterceptor {
	private final Class clazz;
	private final Element element;

	@Nullable
	@Override
	public Object intercept(Object object, Method method, Object[] args, MethodProxy methodProxy) throws Throwable {
		// 如果是 toString eq 等方法都不准确，故直接返回死值
		if (ReflectionUtils.isObjectMethod(method)) {
			return methodProxy.invokeSuper(object, args);
		}
		// 非 bean 方法
		PropertyDescriptor propertyDescriptor = BeanUtils.findPropertyForMethod(method, clazz);
		if (propertyDescriptor == null) {
			return methodProxy.invokeSuper(object, args);
		}
		// 非 read 的方法，只处理 get 方法 is
		if (!method.equals(propertyDescriptor.getReadMethod())) {
			return methodProxy.invokeSuper(object, args);
		}
		// 兼容 lombok bug 强制首字母小写： https://github.com/rzwitserloot/lombok/issues/1861
		String fieldName = StringUtil.firstCharToLower(propertyDescriptor.getDisplayName());
		Field field = clazz.getDeclaredField(fieldName);
		if (field == null) {
			return methodProxy.invokeSuper(object, args);
		}
		CssQuery cssQuery = field.getAnnotation(CssQuery.class);
		// 没有注解，不代理
		if (cssQuery == null) {
			return methodProxy.invokeSuper(object, args);
		}
		Class returnType = method.getReturnType();
		boolean isColl = Collection.class.isAssignableFrom(returnType);
		String cssQueryValue = cssQuery.value();
		// 是否为 bean 中 bean
		boolean isInner = cssQuery.inner();
		if (isInner) {
			return proxyInner(cssQueryValue, method, returnType, isColl);
		}
		Object proxyValue = proxyValue(cssQueryValue, cssQuery, returnType, isColl);
		if (String.class.isAssignableFrom(returnType)) {
			return proxyValue;
		}
		// 用于读取 field 上的注解
		TypeDescriptor typeDescriptor = new TypeDescriptor(field);
		return ConvertUtil.convert(proxyValue, typeDescriptor);
	}

	@Nullable
	private Object proxyValue(String cssQueryValue, CssQuery cssQuery, Class returnType, boolean isColl) {
		if (isColl) {
			Elements elements = Selector.select(cssQueryValue, element);
			Collection