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package org.zodiac.okhttp;

import org.jsoup.nodes.Element;
import org.jsoup.nodes.TextNode;
import org.jsoup.select.Elements;
import org.jsoup.select.Selector;
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.zodiac.commons.util.ConvertUtil;
import org.zodiac.commons.util.lang.Strings;
import org.zodiac.sdk.toolkit.constants.StringPool;
import org.zodiac.sdk.toolkit.util.lang.StrUtil;

import javax.annotation.Nullable;
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。
 *
 */
public class CssQueryMethodInterceptor implements MethodInterceptor {

    private final Class clazz;
    private final Element element;

    public CssQueryMethodInterceptor(Class clazz, Element element) {
        this.clazz = clazz;
        this.element = element;
    }

    @Nullable
    @Override
    public Object intercept(Object object, Method method, Object[] args, MethodProxy methodProxy) throws Throwable {
        /*只处理 get 方法 is 。*/
        String name = method.getName();
        if (!StrUtil.startsWithIgnoreCase(name, StringPool.GET)) {
            return methodProxy.invokeSuper(object, args);
        }
        Field field = clazz.getDeclaredField(StrUtil.lowerCaseFirst2(name.substring(3)));
        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 valueList = newColl(returnType);
            if (elements.isEmpty()) {
                return valueList;
            }
            for (Element select : elements) {
                String value = getValue(select, cssQuery);
                if (value != null) {
                    valueList.add(value);
                }
            }
            return valueList;
        }
        Element select = Selector.selectFirst(cssQueryValue, element);
        return getValue(select, cssQuery);
    }

    private Object proxyInner(String cssQueryValue, Method method, Class returnType, boolean isColl) {
        if (isColl) {
            Elements elements = Selector.select(cssQueryValue, element);
            Collection valueList = newColl(returnType);
            ResolvableType resolvableType = ResolvableType.forMethodReturnType(method);
            Class innerType = resolvableType.getGeneric(0).resolve();
            if (innerType == null) {
                throw new IllegalArgumentException("Class " + returnType + " 读取泛型失败。");
            }
            for (Element select : elements) {
                valueList.add(DomMapper.readValue(select, innerType));
            }
            return valueList;
        }
        Element select = Selector.selectFirst(cssQueryValue, element);
        return DomMapper.readValue(select, returnType);
    }

    @Nullable
    private String getValue(@Nullable Element element, CssQuery cssQuery) {
        if (element == null) {
            return null;
        }
        /*读取的属性名。*/
        String attrName = cssQuery.attr();
        /*读取的值。*/
        String attrValue;
        if (StrUtil.isBlank(attrName)) {
            attrValue = element.outerHtml();
        } else if ("html".equalsIgnoreCase(attrName)) {
            attrValue = element.html();
        } else if ("text".equalsIgnoreCase(attrName)) {
            attrValue = getText(element);
        } else if ("allText".equalsIgnoreCase(attrName)) {
            attrValue = element.text();
        } else {
            attrValue = element.attr(attrName);
        }
        /*判断是否需要正则处理。*/
        String regex = cssQuery.regex();
        if (StrUtil.isBlank(attrValue) || StrUtil.isBlank(regex)) {
            return attrValue;
        }
        /*处理正则表达式。*/
        return getRegexValue(regex, cssQuery.regexGroup(), attrValue);
    }

    @Nullable
    private String getRegexValue(String regex, int regexGroup, String value) {
        /*处理正则表达式。*/
        Matcher matcher = Pattern.compile(regex, Pattern.DOTALL | Pattern.CASE_INSENSITIVE).matcher(value);
        if (!matcher.find()) {
            return null;
        }
        /*正则 group。*/
        if (regexGroup > CssQuery.DEFAULT_REGEX_GROUP) {
            return matcher.group(regexGroup);
        }
        return matcher.group();
    }

    private String getText(Element element) {
        return element.childNodes().stream().filter(node -> node instanceof TextNode).map(node -> (TextNode)node)
            .map(TextNode::text).collect(Collectors.joining());
    }

    private Collection newColl(Class returnType) {
        return Set.class.isAssignableFrom(returnType) ? new HashSet<>() : new ArrayList<>();
    }
}
    

    

    

            

    

            



    
    






    
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