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package com.github.siwenyan.reflection;

import java.lang.reflect.Method;

public class MethodContainer {
    private Object invokeFrom;
    private Method method;

    public MethodContainer(Object invokeFrom, Method method) {
        this.invokeFrom = invokeFrom;
        this.method = method;
    }

    public MethodContainer(Object invokeFrom, String methodName, Class... paramTypes) {
        try {
            Method targetMethod = null;
            Class clazz = invokeFrom.getClass();
            targetMethod = clazz.getDeclaredMethod(methodName, paramTypes);

            this.method = targetMethod;
            this.invokeFrom = invokeFrom;
        } catch (Exception e) {
            throw new RuntimeException("Invalid method: " + methodName);
        }
    }

    public MethodContainer(Object invokeFrom, String methodName) {
        Method targetMethod = null;

        Class clazz = invokeFrom.getClass();
        Method[] methods = clazz.getDeclaredMethods();
        for (Method method : methods) {
            if (method.getName().equals(methodName)) {
                if (null == targetMethod) {
                    targetMethod = method;
                } else {
                    throw new RuntimeException("More than one method found: " + methodName);
                }
            }
        }
        if (null == targetMethod) {
            throw new RuntimeException("No method found: " + methodName);
        }

        this.method = targetMethod;
        this.invokeFrom = invokeFrom;
    }

    public MethodContainer(Class invokeType, String methodName, Class... paramTypes) {
        try {
            Method targetMethod = null;
            targetMethod = invokeType.getDeclaredMethod(methodName, paramTypes);
            if (!ReflectionUtils.isStaticMethod(targetMethod)) {
                throw new RuntimeException("Non-static method: " + methodName);
            }
            this.method = targetMethod;
            this.invokeFrom = null;
        } catch (Exception e) {
            throw new RuntimeException("Invalid method: " + method);
        }
    }

    public MethodContainer(Class invokeType, String methodName) {
        Method targetMethod = null;

        Method[] methods = invokeType.getDeclaredMethods();
        for (Method method : methods) {
            if (method.getName().equals(methodName)) {
                if (ReflectionUtils.isStaticMethod(method)) {
                    if (null != targetMethod) {
                        throw new RuntimeException("More than one method found: " + methodName);
                    } else {
                        targetMethod = method;
                    }
                }
            }
        }
        if (null == targetMethod) {
            throw new RuntimeException("No method found: " + methodName);
        }

        this.method = targetMethod;
        this.invokeFrom = null;
    }

    public Method getMethod() {
        return this.method;
    }

    public Object getInvokeFrom() {
        return this.invokeFrom;
    }
}