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/*
 * Copyright (c) 2020-2030, Shuigedeng ([email protected] & https://blog.taotaocloud.top/).
 *
 * 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
 *
 *      https://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.taotao.boot.dingtalk.multi;

import com.taotao.boot.common.utils.log.LogUtils;
import com.taotao.boot.dingtalk.annatations.EnableMultiDinger;
import com.taotao.boot.dingtalk.annatations.MultiDinger;
import com.taotao.boot.dingtalk.annatations.MultiHandler;
import com.taotao.boot.dingtalk.constant.DingerConstant;
import com.taotao.boot.dingtalk.entity.MultiDingerAlgorithmDefinition;
import com.taotao.boot.dingtalk.entity.MultiDingerConfig;
import com.taotao.boot.dingtalk.enums.DingerType;
import com.taotao.boot.dingtalk.enums.ExceptionEnum;
import com.taotao.boot.dingtalk.enums.MultiDingerConfigContainer;
import com.taotao.boot.dingtalk.exception.DingerException;
import com.taotao.boot.dingtalk.exception.MultiDingerRegisterException;
import com.taotao.boot.dingtalk.listeners.DingerListenersProperty;
import com.taotao.boot.dingtalk.model.DingerConfig;
import com.taotao.boot.dingtalk.utils.DingerUtils;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.support.AbstractBeanDefinition;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.beans.factory.support.GenericBeanDefinition;
import org.springframework.context.annotation.ImportBeanDefinitionRegistrar;
import org.springframework.core.Ordered;
import org.springframework.core.annotation.AnnotationAttributes;
import org.springframework.core.type.AnnotationMetadata;
import org.springframework.objenesis.instantiator.util.ClassUtils;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import static com.taotao.boot.dingtalk.constant.DingerConstant.SPOT_SEPERATOR;
import static com.taotao.boot.dingtalk.enums.ExceptionEnum.MULTIDINGER_ALGORITHM_EXCEPTION;
import static com.taotao.boot.dingtalk.enums.ExceptionEnum.MULTIDINGER_ANNOTATTION_EXCEPTION;
import static com.taotao.boot.dingtalk.enums.MultiDingerConfigContainer.GLOABL_KEY;

/**
 * MultiDingerScannerRegistrar
 *
 * @author shuigedeng
 * @version 2022.07
 * @since 2022-07-06 15:24:19
 */
public class MultiDingerScannerRegistrar extends DingerListenersProperty
        implements ImportBeanDefinitionRegistrar, Ordered {

    /**
     * 算法{@link AlgorithmHandler}容器
     *
     * 

     *
     * {

     * key: dingerClassName | {@link MultiDingerConfigContainer#GLOABL_KEY}(key) + {@link
     * DingerConstant#SPOT_SEPERATOR} + {@link AlgorithmHandler}.simpleName

     * value: {@link MultiDingerAlgorithmDefinition}

     * }

     *
     * 

     */
    protected static final Map MULTIDINGER_ALGORITHM_DEFINITION_MAP =
            new HashMap<>();

    @Override
    public void registerBeanDefinitions(AnnotationMetadata importingClassMetadata, BeanDefinitionRegistry registry) {
        try {
            doScanAndRegister(importingClassMetadata, registry);
        } catch (DingerException ex) {
            throw new MultiDingerRegisterException(ex.getPairs(), ex.getMessage());
        } catch (Exception ex) {
            throw new DingerException(ex, ExceptionEnum.UNKNOWN);
        } finally {
            emptyDingerClasses();
        }
    }

    private void doScanAndRegister(AnnotationMetadata importingClassMetadata, BeanDefinitionRegistry registry) {
        if (!importingClassMetadata.hasAnnotation(EnableMultiDinger.class.getName())) {
            LogUtils.warn("import class can't find EnableMultiDinger annotation.");
            return;
        }

        AnnotationAttributes annotationAttributes = AnnotationAttributes.fromMap(
                importingClassMetadata.getAnnotationAttributes(EnableMultiDinger.class.getName()));

        AnnotationAttributes[] value = annotationAttributes.getAnnotationArray("value");
        boolean aloneMulti = value.length == 0;
        LogUtils.info("multi dinger register and is it global register? {}.", !aloneMulti);
        // 指定多机器人配置处理逻辑
        if (aloneMulti) {
            // 处理需要执行MultiDinger逻辑的dingerClass
            List> dingerClasses = dingerClasses();
            if (dingerClasses.isEmpty()) {
                LogUtils.warn("dinger class is empty, so no need to deal with multiDinger.");
                return;
            }

            multiDingerHandler(registry, dingerClasses);

            if (!MultiDingerConfigContainer.INSTANCE.isEmpty()) {
                MultiDingerProperty.multiDinger = true;
            }
            // 全局多机器人配置处理逻辑
        } else {
            for (AnnotationAttributes attributes : value) {
                DingerType dinger = attributes.getEnum("dinger");
                Class handler = attributes.getClass("handler");

                LogUtils.debug(
                        "enable {} global multi dinger, and multiDinger handler class={}.", dinger, handler.getName());
                DingerConfigHandler dingerConfigHandler = BeanUtils.instantiateClass(handler);
                registerHandler(registry, dinger, dinger + SPOT_SEPERATOR + GLOABL_KEY, dingerConfigHandler);
                MultiDingerProperty.multiDinger = true;
            }
        }
    }

    /**
     * 处理DingerClass绑定的MultiHandler并注册{@link AlgorithmHandler}
     *
     * @param registry 注册器
     * @param dingerClasses dingerClass集
     */
    private void multiDingerHandler(BeanDefinitionRegistry registry, List> dingerClasses) {

        int valid = 0;
        for (Class dingerClass : dingerClasses) {
            if (dingerClass.isAnnotationPresent(MultiHandler.class)) {
                MultiHandler multiDinger = dingerClass.getAnnotation(MultiHandler.class);
                MultiDinger value = multiDinger.value();
                Class dingerConfigHandler = value.handler();
                String beanName = dingerConfigHandler.getSimpleName();
                // 如果DingerClass指定的MultiHandler对应的处理器为接口，则直接跳过
                if (dingerConfigHandler.isInterface()) {
                    LogUtils.warn(
                            "dingerClass={} handler className={} is interface and skip.",
                            dingerClass.getSimpleName(),
                            beanName);
                    continue;
                }
                String key = dingerClass.getName();
                DingerConfigHandler handler = ClassUtils.newInstance(dingerConfigHandler);
                DingerType dinger = value.dinger();

                registerHandler(registry, dinger, dinger + SPOT_SEPERATOR + key, handler);

                LogUtils.debug(
                        "regiseter multi dinger for dingerClass={} and dingerConfigHandler={}.",
                        dingerClass.getSimpleName(),
                        beanName);
                valid++;
            }
        }

        if (valid == 0) {
            LogUtils.warn("enable global multi dinger but none dinger interface be decorated with" + " @MultiHandler.");
        }
    }

    /**
     * 注册 AlgorithmHandler
     *
     * @param registry 注册器
     * @param dinger Dinger类型
     * @param key 当前dingerClass类名
     * @param dingerConfigHandler dingerClass指定的multiHandler处理器实例
     */
    private void registerHandler(
            BeanDefinitionRegistry registry, DingerType dinger, String key, DingerConfigHandler dingerConfigHandler) {
        String dingerConfigHandlerClassName = dingerConfigHandler.getClass().getSimpleName();

        if (!dinger.isEnabled()) {
            throw new DingerException(MULTIDINGER_ANNOTATTION_EXCEPTION, key, dinger);
        }

        // 获取当前指定算法类名, 默认四种，或使用自定义
        Class algorithm = dingerConfigHandler.algorithmHandler();
        // if empty? use default dinger config
        List dingerConfigs = dingerConfigHandler.dingerConfigs();
        dingerConfigs = dingerConfigs == null ? new ArrayList<>() : dingerConfigs;

        if (algorithm == null) {
            throw new DingerException(MULTIDINGER_ALGORITHM_EXCEPTION, dingerConfigHandlerClassName);
        }

        for (int i = 0; i < dingerConfigs.size(); i++) {
            DingerConfig dingerConfig = dingerConfigs.get(i);
            dingerConfig.setDingerType(dinger);
            if (DingerUtils.isEmpty(dingerConfig.getTokenId())) {
                throw new DingerException(
                        ExceptionEnum.DINGER_CONFIG_HANDLER_EXCEPTION, dingerConfigHandlerClassName, i);
            }
        }

        // 目前只支持属性方式注入, 可优化支持构造器注入和set注入
        long injectionCnt = Arrays.stream(algorithm.getDeclaredFields())
                .filter(e -> e.isAnnotationPresent(Autowired.class))
                .count();
        // 如果无注入对象，直接反射算法处理器对象
        AnalysisEnum mode = AnalysisEnum.REFLECT;
        // 如果无需注入属性，直接采用反射进行实例化并注册到容器
        if (injectionCnt == 0) {
            // create algorithm instance
            AlgorithmHandler algorithmHandler = ClassUtils.newInstance(algorithm);
            MultiDingerConfigContainer.INSTANCE.put(key, new MultiDingerConfig(algorithmHandler, dingerConfigs));
        } else {
            BeanDefinitionBuilder beanDefinitionBuilder = BeanDefinitionBuilder.genericBeanDefinition(algorithm);
            AbstractBeanDefinition beanDefinition = beanDefinitionBuilder.getBeanDefinition();
            beanDefinition.setAutowireMode(GenericBeanDefinition.AUTOWIRE_BY_TYPE);
            // 将当前算法注册到Spring容器中
            String beanName = key + SPOT_SEPERATOR + algorithm.getSimpleName();
            registry.registerBeanDefinition(beanName, beanDefinition);
            MULTIDINGER_ALGORITHM_DEFINITION_MAP.put(
                    beanName,
                    new MultiDingerAlgorithmDefinition(key, algorithm, dingerConfigs, dingerConfigHandlerClassName));
            mode = AnalysisEnum.SPRING_CONTAINER;
        }
        LogUtils.debug("key={}, algorithm={} analysis through mode {}.", key, algorithm.getSimpleName(), mode);
    }

    @Override
    public int getOrder() {
        return LOWEST_PRECEDENCE - 1;
    }

    public enum AnalysisEnum {
        /** 反射方式 */
        REFLECT,
        /** Spring容器 */
        SPRING_CONTAINER;
    }
}




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