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package com.osc.lego.lazyloader.utils;

import java.lang.reflect.Method;

/**
 * bean工具类
 *
 * @author peter
 * @date 2023/05/24
 */
public class BeanUtil {

    public static final String PREFIX_GETTER_IS = "is";
    public static final String PREFIX_GETTER_GET = "get";
    public static final String PREFIX_SETTER = "set";
    public static final String PREFIX_ADDER = "add";

    public BeanUtil() {}

    public static boolean isAdder(Method method) {
        int parameterCount = getParameterCount(method);
        if (parameterCount != 1) {
            return false;
        } else {
            Class returnType = method.getReturnType();
            if (returnType != Void.TYPE) {
                return false;
            } else {
                String methodName = method.getName();
                return methodName.startsWith("add");
            }
        }
    }

    public static boolean isGetter(Method method) {
        int parameterCount = getParameterCount(method);
        if (parameterCount > 0) {
            return false;
        } else {
            Class returnType = method.getReturnType();
            if (returnType == Void.TYPE) {
                return false;
            } else {
                String methodName = method.getName();
                if (!methodName.startsWith("get") && !methodName.startsWith("is")) {
                    return false;
                } else {
                    return !methodName.startsWith("is")
                            || returnType.equals(Boolean.TYPE)
                            || returnType.equals(Boolean.class);
                }
            }
        }
    }

    private static int getParameterCount(Method method) {
        return method.getParameterTypes().length;
    }

    public static boolean isSetter(Method method) {
        int parameterCount = getParameterCount(method);
        if (parameterCount != 1) {
            return false;
        } else {
            Class returnType = method.getReturnType();
            if (returnType != Void.TYPE) {
                return false;
            } else {
                String methodName = method.getName();
                return methodName.startsWith("set");
            }
        }
    }

    public static String getPropertyName(Method method) {
        String methodName = method.getName();
        String rawPropertyName = getSubstringIfPrefixMatches(methodName, "get");
        if (rawPropertyName == null) {
            rawPropertyName = getSubstringIfPrefixMatches(methodName, "set");
        }

        if (rawPropertyName == null) {
            rawPropertyName = getSubstringIfPrefixMatches(methodName, "is");
        }

        if (rawPropertyName == null) {
            rawPropertyName = getSubstringIfPrefixMatches(methodName, "add");
        }

        return toLowerCamelCase(rawPropertyName);
    }

    public static String toLowerCamelCase(String string) {
        if (string == null) {
            return null;
        } else if (string.isEmpty()) {
            return string;
        } else if (string.length() > 1
                && Character.isUpperCase(string.charAt(1))
                && Character.isUpperCase(string.charAt(0))) {
            return string;
        } else {
            char[] chars = string.toCharArray();
            chars[0] = Character.toLowerCase(chars[0]);
            return new String(chars);
        }
    }

    private static String getSubstringIfPrefixMatches(String wholeString, String prefix) {
        return wholeString.startsWith(prefix) ? wholeString.substring(prefix.length()) : null;
    }
}