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package com.xiongyingqi.common.logic.handle;

import com.xiongyingqi.common.logic.config.annotation.ConditionField;
import com.xiongyingqi.common.logic.config.annotation.ConditionFieldIgnore;
import com.xiongyingqi.common.logic.handle.constants.ConditionFieldType;
import com.xiongyingqi.common.utils.reflect.ReflectionUtils;
import com.xiongyingqi.common.utils.string.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.*;

/**
 * 处理输入对象为map，形式是 fieldName -> fieldValue
 *
 * @author xiongyingqi
 * @since 20171019//
 */
public class ConditionFieldHandler {
  private static final Logger logger = LoggerFactory.getLogger(ConditionFieldHandler.class);
  private static final Map, Collection> CACHE = new WeakHashMap, Collection>();

  /**
   * 处理输入对象为map，形式是 fieldName -> fieldValue
   *
   * @param object 输入对象
   * @return name -> fieldValue
   * @throws HandlerException 处理异常
   */
  public static Map processFieldAndValue(Object object) throws HandlerException {
    if (object == null) {
      return null;
    }
    Collection annotation = getAnnotation(object);
    HashMap map = new HashMap(annotation.size());
    for (ConditionFieldEntry conditionFieldEntry : annotation) {
      processEntry(object, conditionFieldEntry, map);
    }
    if (logger.isDebugEnabled()) {
      logger.debug("Process object: {} to field string: {}", object, map);
    }

    return map;
  }

  private static void processEntry(Object instance, ConditionFieldEntry entry, Map toResult) throws HandlerException {
    ConditionFieldType conditionFieldType = entry.getConditionFieldType();
    String name = entry.getName();
    switch (conditionFieldType) {
      case FIELD:
        Field field = entry.getField();
        try {
          Object fieldValue = ReflectionUtils.getFieldValue(field, instance);
          if (fieldValue == null) {
            return;
          }
          toResult.put(name, fieldValue.toString());
        } catch (IllegalAccessException e) {
          logger.error("", e);
        }
        return;
      case METHOD:
        Method method = entry.getMethod();
        try {
          Object value = method.invoke(instance);
          if (value == null) {
            return;
          }
          toResult.put(name, value.toString());
        } catch (Exception e) {
          logger.error("Error when invoke method: " + method + ". ERROR: " + e.getMessage(), e);
        }
        return;
      default:
        throw new HandlerException("Unknown conditionFieldType: " + conditionFieldType);
    }
  }

  private static Collection getAnnotation(Object object) {
    Class clazz = object.getClass();
    Collection exists = CACHE.get(object.getClass());
    if (exists != null) {
      if (logger.isDebugEnabled()) {
        logger.debug("Returns conditionFieldEntry: {} by class: {}", exists, clazz);
      }
      return exists;
    }
    synchronized (ConditionFieldHandler.class) {
      Field[] fields = ReflectionUtils.findFields(clazz, true);
      ArrayList conditionFieldEntries = new ArrayList(fields.length);
      for (Field field : fields) {
        ConditionFieldEntry conditionFieldEntry = processField(field);
        if (conditionFieldEntry != null) {
          conditionFieldEntries.add(conditionFieldEntry);
        }
      }
      logger.info("Initialized conditionFieldEntry: {} by class: {}", conditionFieldEntries, clazz);
      CACHE.put(clazz, conditionFieldEntries);
      return conditionFieldEntries;
    }
  }

  private static ConditionFieldEntry processField(Field field) {
    if (field.isAnnotationPresent(ConditionFieldIgnore.class)) {
      return null;
    }
    boolean annotationPresent = field.isAnnotationPresent(ConditionField.class);
    if (annotationPresent) {
      ConditionField annotation = field.getAnnotation(ConditionField.class);
      String value = annotation.value();
      if (StringUtils.isEmpty(value)) {
        value = field.getName();
      }
      return new ConditionFieldEntry(field, null, value, ConditionFieldType.FIELD);
    }
    Method getMethod = null;
    try {
      getMethod = ReflectionUtils.findGetMethod(field);
    } catch (NoSuchMethodException e) {
      logger.error("", e);
    }

    if (getMethod != null && getMethod.isAnnotationPresent(ConditionFieldIgnore.class)) {
      return null;
    }
    if (getMethod == null || !getMethod.isAnnotationPresent(ConditionField.class)) {
      return new ConditionFieldEntry(field, null, field.getName(), ConditionFieldType.FIELD);
    }
    ConditionField annotation = getMethod.getAnnotation(ConditionField.class);
    String value = annotation.value();
    if (StringUtils.hasLength(value)) {
      return new ConditionFieldEntry(field, getMethod, value, ConditionFieldType.METHOD);
    }
    return new ConditionFieldEntry(field, getMethod, field.getName(), ConditionFieldType.METHOD);
  }
}