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/*
 * Copyright (C) 2023-2024 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
 *
 *      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 io.pipelite.expression.support;

import io.pipelite.common.support.Preconditions;
import io.pipelite.expression.core.el.bean.BeanPropertyAccessException;
import io.pipelite.expression.core.el.bean.BeanPropertyAccessStrategy;
import io.pipelite.expression.core.el.bean.PropertyDescriptorAccessStrategy;

public class BeanWrapper {

    private final Object target;

    private final BeanPropertyAccessStrategy accessStrategy;

    private BeanPropertyAccessStrategy fallbackStrategy;

    public static BeanWrapper target(Object target) {
        return new BeanWrapper(target);
    }

    public static BeanWrapper target(Object target, BeanPropertyAccessStrategy fallbackAccessStrategy) {
        return new BeanWrapper(target, fallbackAccessStrategy);
    }

    public BeanWrapper(Object target) {
        this(target, null);
    }

    public BeanWrapper(Object target, BeanPropertyAccessStrategy fallbackAccessStrategy) {
        Preconditions.notNull(target, "Object target");
        this.target = target;
        this.accessStrategy = new PropertyDescriptorAccessStrategy(target);
        this.fallbackStrategy = fallbackAccessStrategy;
    }

    public Object getTarget() {
        return target;
    }

    public Class getTargetType() {
        return target.getClass();
    }

    @SuppressWarnings("unchecked")
    public  T evaluatePath(String path) {
        BeanWrapper beanWrapper = this;
        String propertyName = null;
        if (path.indexOf('.') > 0) {
            String[] pathArray = path.split("\\.");
            for (int i = 0; i < pathArray.length; i++) {
                propertyName = pathArray[i];
                if (i < pathArray.length - 1) {
                    Class propertyType = ReflectionUtils.resolveFieldType(beanWrapper.getTargetType(), propertyName);
                    beanWrapper = beanWrapper.wrapProperty(propertyType, propertyName);
                }
            }
        }
        else {
            propertyName = path;
        }
        Class propertyType = ReflectionUtils.resolveFieldType(beanWrapper.getTargetType(), propertyName);
        return (T) beanWrapper.getPropertyValue(propertyType, propertyName);
    }

    public  BeanWrapper wrapProperty(Class propertyType, String propertyName) {
        return new BeanWrapper(getPropertyValue(propertyType, propertyName), fallbackStrategy);
    }

    public  T getPropertyValue(Class propertyType, String propertyName) {
        try {
            return accessStrategy.readProperty(target, propertyType, propertyName);
        }
        catch (BeanPropertyAccessException exception) {
            if (fallbackStrategy != null) {
                return fallbackStrategy.readProperty(target, propertyType, propertyName);
            }
            throw exception;
        }
    }

    public void setPropertyValue(String propertyName, Object value) {
        try {
            accessStrategy.writeProperty(target, propertyName, value);
        }
        catch (BeanPropertyAccessException exception) {
            if (fallbackStrategy != null) {
                fallbackStrategy.writeProperty(target, propertyName, value);
            }
            else {
                throw exception;
            }
        }
    }

    public void setFallbackStrategy(BeanPropertyAccessStrategy fallbackStrategy) {
        this.fallbackStrategy = fallbackStrategy;
    }

}