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/**
 * Copyright (c) 2008, SnakeYAML
 *
 * 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
 *
 * http://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 org.yaml.snakeyaml.introspector;

import java.lang.annotation.Annotation;
import java.lang.reflect.Array;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

import org.yaml.snakeyaml.error.YAMLException;
import org.yaml.snakeyaml.internal.Logger;
import org.yaml.snakeyaml.internal.Logger.Level;

// TODO: decide priorities for get/set Read/Field/Delegate Write/Field/Delegate - is FIELD on the
// correct place ?
public class PropertySubstitute extends Property {

  private static final Logger log =
      Logger.getLogger(PropertySubstitute.class.getPackage().getName());

  protected Class targetType;
  private final String readMethod;
  private final String writeMethod;
  private transient Method read;
  private transient Method write;
  private Field field;
  protected Class[] parameters;
  private Property delegate;
  private boolean filler;

  public PropertySubstitute(String name, Class type, String readMethod, String writeMethod,
      Class... params) {
    super(name, type);
    this.readMethod = readMethod;
    this.writeMethod = writeMethod;
    setActualTypeArguments(params);
    this.filler = false;
  }

  public PropertySubstitute(String name, Class type, Class... params) {
    this(name, type, null, null, params);
  }

  @Override
  public Class[] getActualTypeArguments() {
    if (parameters == null && delegate != null) {
      return delegate.getActualTypeArguments();
    }
    return parameters;
  }

  public void setActualTypeArguments(Class... args) {
    if (args != null && args.length > 0) {
      parameters = args;
    } else {
      parameters = null;
    }
  }

  @Override
  public void set(Object object, Object value) throws Exception {
    if (write != null) {
      if (!filler) {
        write.invoke(object, value);
      } else if (value != null) {
        if (value instanceof Collection) {
          Collection collection = (Collection) value;
          for (Object val : collection) {
            write.invoke(object, val);
          }
        } else if (value instanceof Map) {
          Map map = (Map) value;
          for (Entry entry : map.entrySet()) {
            write.invoke(object, entry.getKey(), entry.getValue());
          }
        } else if (value.getClass().isArray()) {
          // TODO: maybe arrays need 2 fillers like SET(index, value) add ADD(value)
          int len = Array.getLength(value);
          for (int i = 0; i < len; i++) {
            write.invoke(object, Array.get(value, i));
          }
        }
      }
    } else if (field != null) {
      field.set(object, value);
    } else if (delegate != null) {
      delegate.set(object, value);
    } else {
      log.warn("No setter/delegate for '" + getName() + "' on object " + object);
    }
    // TODO: maybe throw YAMLException here
  }

  @Override
  public Object get(Object object) {
    try {
      if (read != null) {
        return read.invoke(object);
      } else if (field != null) {
        return field.get(object);
      }
    } catch (Exception e) {
      throw new YAMLException(
          "Unable to find getter for property '" + getName() + "' on object " + object + ":" + e);
    }

    if (delegate != null) {
      return delegate.get(object);
    }
    throw new YAMLException(
        "No getter or delegate for property '" + getName() + "' on object " + object);
  }

  @Override
  public List getAnnotations() {
    Annotation[] annotations = null;
    if (read != null) {
      annotations = read.getAnnotations();
    } else if (field != null) {
      annotations = field.getAnnotations();
    }
    return annotations != null ? Arrays.asList(annotations) : delegate.getAnnotations();
  }

  @Override
  public  A getAnnotation(Class annotationType) {
    A annotation;
    if (read != null) {
      annotation = read.getAnnotation(annotationType);
    } else if (field != null) {
      annotation = field.getAnnotation(annotationType);
    } else {
      annotation = delegate.getAnnotation(annotationType);
    }
    return annotation;
  }

  public void setTargetType(Class targetType) {
    if (this.targetType != targetType) {
      this.targetType = targetType;

      final String name = getName();
      for (Class c = targetType; c != null; c = c.getSuperclass()) {
        for (Field f : c.getDeclaredFields()) {
          if (f.getName().equals(name)) {
            int modifiers = f.getModifiers();
            if (!Modifier.isStatic(modifiers) && !Modifier.isTransient(modifiers)) {
              f.setAccessible(true);
              field = f;
            }
            break;
          }
        }
      }
      if (field == null && log.isLoggable(Level.WARNING)) {
        log.warn(String.format("Failed to find field for %s.%s", targetType.getName(), getName()));
      }

      // Retrieve needed info
      if (readMethod != null) {
        read = discoverMethod(targetType, readMethod);
      }
      if (writeMethod != null) {
        filler = false;
        write = discoverMethod(targetType, writeMethod, getType());
        if (write == null && parameters != null) {
          filler = true;
          write = discoverMethod(targetType, writeMethod, parameters);
        }
      }
    }
  }

  private Method discoverMethod(Class type, String name, Class... params) {
    for (Class c = type; c != null; c = c.getSuperclass()) {
      for (Method method : c.getDeclaredMethods()) {
        if (name.equals(method.getName())) {
          Class[] parameterTypes = method.getParameterTypes();
          if (parameterTypes.length != params.length) {
            continue;
          }
          boolean found = true;
          for (int i = 0; i < parameterTypes.length; i++) {
            if (!parameterTypes[i].isAssignableFrom(params[i])) {
              found = false;
            }
          }
          if (found) {
            method.setAccessible(true);
            return method;
          }
        }
      }
    }
    if (log.isLoggable(Level.WARNING)) {
      log.warn(String.format("Failed to find [%s(%d args)] for %s.%s", name, params.length,
          targetType.getName(), getName()));
    }
    return null;
  }

  @Override
  public String getName() {
    final String n = super.getName();
    if (n != null) {
      return n;
    }
    return delegate != null ? delegate.getName() : null;
  }

  @Override
  public Class getType() {
    final Class t = super.getType();
    if (t != null) {
      return t;
    }
    return delegate != null ? delegate.getType() : null;
  }

  @Override
  public boolean isReadable() {
    return (read != null) || (field != null) || (delegate != null && delegate.isReadable());
  }

  @Override
  public boolean isWritable() {
    return (write != null) || (field != null) || (delegate != null && delegate.isWritable());
  }

  public void setDelegate(Property delegate) {
    this.delegate = delegate;
    if (writeMethod != null && write == null && !filler) {
      filler = true;
      write = discoverMethod(targetType, writeMethod, getActualTypeArguments());
    }
  }
}