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package selva.oss.lang.reflection;

import static selva.oss.lang.Commons.*;

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

public class ReflectiveData {

    private Object object;
    private Class pojoClass;

    public ReflectiveData(Object object) {
        validateNotNull(object);

        this.object = object;
        this.pojoClass = object.getClass();
    }

    public static class CouldNotInstantiateObjectException extends RuntimeException {
        public CouldNotInstantiateObjectException() {
            super("A Default constructor that is public is expected in the pojo.");
        }
    }

    public ReflectiveData(Class pojoClass) {
        validateNotNull(pojoClass);

        this.pojoClass = pojoClass;
        try {
            this.object = this.pojoClass.getConstructor().newInstance();
        } catch (NoSuchMethodException | InstantiationException | IllegalAccessException | InvocationTargetException e) {
            throw new CouldNotInstantiateObjectException();
        }
    }

    public boolean containsField(String field) {
        try {
            this.pojoClass.getDeclaredField(field);
            return true;
        } catch (NoSuchFieldException e) {
            return false;
        }
    }

    public static class FieldNotFoundException extends RuntimeException {
    }

    public Field getDeclaredField(String field) {
        try {
            return this.pojoClass.getDeclaredField(field);
        } catch (NoSuchFieldException e) {
            throw new FieldNotFoundException();
        }
    }

    public static class CouldNotAccessFieldException extends RuntimeException {
    }

    public Object get(String field) {
        try {
            return getDeclaredField(field).get(this.object);
        } catch (IllegalAccessException e) {
            throw new CouldNotAccessFieldException();
        }
    }

    public void set(String field, Object value) {
        try {
            getDeclaredField(field).set(this.object, value);
        } catch (IllegalAccessException e) {
            throw new CouldNotAccessFieldException();
        }
    }

}