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/*
 * Copyright 2012 the original author or authors.
 *
 * 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 leap.lang.beans;

import leap.lang.Named;
import leap.lang.TypeInfo;
import leap.lang.accessor.AnnotationsGetter;
import leap.lang.accessor.TypeInfoGetter;
import leap.lang.convert.ConvertContext;
import leap.lang.convert.ConvertUnsupportedException;
import leap.lang.convert.Converts;
import leap.lang.logging.Log;
import leap.lang.logging.LogFactory;
import leap.lang.reflect.ReflectField;
import leap.lang.reflect.ReflectMethod;
import leap.lang.reflect.ReflectParameter;
import leap.lang.reflect.ReflectValued;

import java.lang.annotation.Annotation;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Type;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.Map;

public class BeanProperty implements Named, TypeInfoGetter, AnnotationsGetter, ReflectValued {
    private static final Log log = LogFactory.get(BeanProperty.class);

    private String                       name;
    private Class                     type;
    private Type                         genericType;
    private TypeInfo                     typeInfo;
    private Class                     declaringClass;
    private ReflectField                 field;
    private ReflectMethod                getter;
    private ReflectMethod                setter;
    private BeanType                     beanType;
    private boolean                      readable;
    private boolean                      writable;
    private boolean                      _transient;
    private Annotation[]                 annotations = new Annotation[]{};
    private Map, ReflectMethod> extraSetters;

    protected BeanProperty(BeanType beanType, String name) {
        this.name = name;
        this.beanType = beanType;
    }

    public String getName() {
        return name;
    }

    public Class getType() {
        return type;
    }

    public Type getGenericType() {
        return genericType;
    }

    public Class getElementType() {
        return typeInfo.getElementType();
    }

    public TypeInfo getTypeInfo() {
        return typeInfo;
    }

    public Class getDeclaringClass() {
        return declaringClass;
    }

    protected void setDeclaringClass(Class declaringClass) {
        this.declaringClass = declaringClass;
    }

    public BeanType getBeanType() {
        return beanType;
    }

    public Annotation[] getAnnotations() {
        return annotations;
    }

    public boolean isReadable() {
        return readable;
    }

    public boolean isWritable() {
        return writable;
    }

    public boolean isTransient() {
        return _transient;
    }

    public boolean isSimpleType() {
        return typeInfo.isSimpleType();
    }

    public boolean isComplexType() {
        return typeInfo.isComplexType();
    }

    public boolean isField() {
        return null != field;
    }

    public boolean hasGetter() {
        return null != getter;
    }

    public boolean hasSetter() {
        return null != setter;
    }

    public Field getField() {
        return null != field ? field.getReflectedField() : null;
    }

    public ReflectField getReflectField() {
        return field;
    }

    public Method getSetter() {
        return null != setter ? setter.getReflectedMethod() : null;
    }

    public Method getGetter() {
        return null != getter ? getter.getReflectedMethod() : null;
    }

    public Map, ReflectMethod> getExtraSetters() {
        return extraSetters;
    }

    @Override
    public Object getRawValue(Object bean) {
        return null != field ? field.getValue(bean) : getValue(bean);
    }

    public Object getValue(Object bean) {
        if (!readable) {
            throw new IllegalStateException("Property '" + name + "' of '" + beanType.getBeanClass().getName() + "' not readable");
        }

        return null != getter ? getter.invoke(bean) : field.getValue(bean, true);
    }

    public void setValue(Object bean,Object value){
        if(!writable) {
            throw new IllegalStateException("Property '" + name + "' is not writable at '" + beanType.getBeanClass().getName() + "'");
        }

        if(null != value && !type.isAssignableFrom(value.getClass())){
            value = Converts.convert(value, type,genericType);
        }

        if(null != setter){
            setter.invoke(bean,value);
        }else{
            field.setValue(bean, value, true);
        }
    }

    public boolean trySetValue(Object bean,Object value) {
        if(writable){
            try {
                if(null != value && !type.isAssignableFrom(value.getClass())){
                    value = Converts.convert(value, type,genericType);
                }

                if(null != setter){
                    setter.invoke(bean,value);
                }else{
                    field.setValue(bean, value, true);
                }

                return true;
            } catch (ConvertUnsupportedException e) {
                log.debug("cannot set property '{}' of bean '{}' -> {}",name,beanType.getBeanClass().getSimpleName(),e.getMessage());
            }
        }
        return false;
    }

    protected void setType(Class type) {
        this.type = type;
    }

    protected void setGenericType(Type genericType) {
        this.genericType = genericType;
    }

    protected void setTypeInfo(TypeInfo typeInfo) {
        this.typeInfo = typeInfo;
    }

    protected void setField(ReflectField field) {
        this.field = field;
    }

    protected void setSetter(ReflectMethod setter) {
        this.setter = setter;
    }

    protected void setGetter(ReflectMethod getter) {
        this.getter = getter;
    }

    protected void setReadable(boolean readable) {
        this.readable = readable;
    }

    protected void setWritable(boolean writable) {
        this.writable = writable;
    }

    protected void setTransient(boolean isTransient) {
        this._transient = isTransient;
    }

    protected void setAnnotations(Annotation[] annotations) {
        this.annotations = annotations;
    }

    protected void addExtraSetter(ReflectMethod setter) {
        if (null == extraSetters) {
            extraSetters = new LinkedHashMap<>(1);
        }
        extraSetters.put(setter.getParameters()[0].getType(), setter);
    }

    @Override
    public String toString() {
        return "BeanProperty:" + beanType.getBeanClass().getName() + "#" + name;
    }
}