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package com.github.leeonky.util;

import java.lang.reflect.Method;
import java.lang.reflect.Type;

import static com.github.leeonky.util.StringUtil.unCapitalize;
import static com.github.leeonky.util.Suppressor.get;

class MethodPropertyReader extends MethodProperty implements PropertyReader {
    private static final int BOOLEAN_GETTER_PREFIX_LENGTH = 2;
    private static final int GETTER_PREFIX_LENGTH = 3;
    private String name;

    MethodPropertyReader(BeanClass beanClass, Method method) {
        super(beanClass, method);
    }

    static boolean isGetter(Method method) {
        String methodName = method.getName();
        return method.getParameters().length == 0 &&
                (method.getReturnType().equals(boolean.class) ?
                        methodName.startsWith("is") : (methodName.startsWith("get")));
    }

    @Override
    public Object getValue(T instance) {
        return get(() -> method.invoke(instance));
    }

    @Override
    protected Type provideGenericType() {
        return method.getGenericReturnType();
    }

    @Override
    public String getName() {
        if (name == null) {
            String methodName = method.getName();
            return name = unCapitalize(method.getReturnType().equals(boolean.class) ?
                    methodName.substring(BOOLEAN_GETTER_PREFIX_LENGTH) : methodName.substring(GETTER_PREFIX_LENGTH));
        }
        return name;
    }

    @Override
    public boolean isBeanProperty() {
        return super.isBeanProperty() && !method.getName().equals("getClass");
    }
}