/*
 *      Copyright (c) 2018-2028, DreamLu All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions are met:
 *
 *  Redistributions of source code must retain the above copyright notice,
 *  this list of conditions and the following disclaimer.
 *  Redistributions in binary form must reproduce the above copyright
 *  notice, this list of conditions and the following disclaimer in the
 *  documentation and/or other materials provided with the distribution.
 *  Neither the name of the dreamlu.net developer nor the names of its
 *  contributors may be used to endorse or promote products derived from
 *  this software without specific prior written permission.
 *  Author: DreamLu 卢春梦 (596392912@qq.com)
 */
package org.springblade.core.tool.utils;

import lombok.extern.slf4j.Slf4j;
import org.springblade.core.tool.jackson.JsonUtil;
import org.springframework.http.MediaType;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import org.springframework.web.method.HandlerMethod;

import javax.servlet.ServletInputStream;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.nio.charset.StandardCharsets;
import java.util.Enumeration;
import java.util.Objects;
import java.util.function.Predicate;


/**
 * Miscellaneous utilities for web applications.
 *
 * @author L.cm
 */
@Slf4j
public class WebUtil extends org.springframework.web.util.WebUtils {

	public static final String USER_AGENT_HEADER = "user-agent";

	/**
	 * 判断是否ajax请求
	 * spring ajax 返回含有 ResponseBody 或者 RestController注解
	 *
	 * @param handlerMethod HandlerMethod
	 * @return 是否ajax请求
	 */
	public static boolean isBody(HandlerMethod handlerMethod) {
		ResponseBody responseBody = ClassUtil.getAnnotation(handlerMethod, ResponseBody.class);
		return responseBody != null;
	}

	/**
	 * 读取cookie
	 *
	 * @param name cookie name
	 * @return cookie value
	 */
	@Nullable
	public static String getCookieVal(String name) {
		HttpServletRequest request = WebUtil.getRequest();
		Assert.notNull(request, "request from RequestContextHolder is null");
		return getCookieVal(request, name);
	}

	/**
	 * 读取cookie
	 *
	 * @param request HttpServletRequest
	 * @param name    cookie name
	 * @return cookie value
	 */
	@Nullable
	public static String getCookieVal(HttpServletRequest request, String name) {
		Cookie cookie = getCookie(request, name);
		return cookie != null ? cookie.getValue() : null;
	}

	/**
	 * 清除 某个指定的cookie
	 *
	 * @param response HttpServletResponse
	 * @param key      cookie key
	 */
	public static void removeCookie(HttpServletResponse response, String key) {
		setCookie(response, key, null, 0);
	}

	/**
	 * 设置cookie
	 *
	 * @param response        HttpServletResponse
	 * @param name            cookie name
	 * @param value           cookie value
	 * @param maxAgeInSeconds maxage
	 */
	public static void setCookie(HttpServletResponse response, String name, @Nullable String value, int maxAgeInSeconds) {
		Cookie cookie = new Cookie(name, value);
		cookie.setPath(StringPool.SLASH);
		cookie.setMaxAge(maxAgeInSeconds);
		cookie.setHttpOnly(true);
		response.addCookie(cookie);
	}

	/**
	 * 获取 HttpServletRequest
	 *
	 * @return {HttpServletRequest}
	 */
	public static HttpServletRequest getRequest() {
		RequestAttributes requestAttributes = RequestContextHolder.getRequestAttributes();
		return (requestAttributes == null) ? null : ((ServletRequestAttributes) requestAttributes).getRequest();
	}

	/**
	 * 返回json
	 *
	 * @param response HttpServletResponse
	 * @param result   结果对象
	 */
	public static void renderJson(HttpServletResponse response, Object result) {
		renderJson(response, result, MediaType.APPLICATION_JSON_VALUE);
	}

	/**
	 * 返回json
	 *
	 * @param response    HttpServletResponse
	 * @param result      结果对象
	 * @param contentType contentType
	 */
	public static void renderJson(HttpServletResponse response, Object result, String contentType) {
		response.setCharacterEncoding("UTF-8");
		response.setContentType(contentType);
		try (PrintWriter out = response.getWriter()) {
			out.append(JsonUtil.toJson(result));
		} catch (IOException e) {
			log.error(e.getMessage(), e);
		}
	}

	/**
	 * 获取ip
	 *
	 * @return {String}
	 */
	public static String getIP() {
		return getIP(WebUtil.getRequest());
	}

	private static final String[] IP_HEADER_NAMES = new String[]{
		"x-forwarded-for",
		"Proxy-Client-IP",
		"WL-Proxy-Client-IP",
		"HTTP_CLIENT_IP",
		"HTTP_X_FORWARDED_FOR"
	};

	private static final Predicate<String> IP_PREDICATE = (ip) -> StringUtil.isBlank(ip) || StringPool.UNKNOWN.equalsIgnoreCase(ip);

	/**
	 * 获取ip
	 *
	 * @param request HttpServletRequest
	 * @return {String}
	 */
	@Nullable
	public static String getIP(@Nullable HttpServletRequest request) {
		if (request == null) {
			return StringPool.EMPTY;
		}
		String ip = null;
		for (String ipHeader : IP_HEADER_NAMES) {
			ip = request.getHeader(ipHeader);
			if (!IP_PREDICATE.test(ip)) {
				break;
			}
		}
		if (IP_PREDICATE.test(ip)) {
			ip = request.getRemoteAddr();
		}
		return StringUtil.isBlank(ip) ? null : StringUtil.splitTrim(ip, StringPool.COMMA)[0];
	}

	/**
	 * 获取请求头的值
	 *
	 * @param name 请求头名称
	 * @return 请求头
	 */
	public static String getHeader(String name) {
		HttpServletRequest request = getRequest();
		return Objects.requireNonNull(request).getHeader(name);
	}

	/**
	 * 获取请求头的值
	 *
	 * @param name 请求头名称
	 * @return 请求头
	 */
	public static Enumeration<String> getHeaders(String name) {
		HttpServletRequest request = getRequest();
		return Objects.requireNonNull(request).getHeaders(name);
	}

	/**
	 * 获取所有的请求头
	 *
	 * @return 请求头集合
	 */
	public static Enumeration<String> getHeaderNames() {
		HttpServletRequest request = getRequest();
		return Objects.requireNonNull(request).getHeaderNames();
	}

	/**
	 * 获取请求参数
	 *
	 * @param name 请求参数名
	 * @return 请求参数
	 */
	public static String getParameter(String name) {
		HttpServletRequest request = getRequest();
		return Objects.requireNonNull(request).getParameter(name);
	}

	/**
	 * 获取 request 请求体
	 *
	 * @param servletInputStream servletInputStream
	 * @return body
	 */
	public static String getRequestBody(ServletInputStream servletInputStream) {
		StringBuilder sb = new StringBuilder();
		BufferedReader reader = null;
		try {
			reader = new BufferedReader(new InputStreamReader(servletInputStream, StandardCharsets.UTF_8));
			String line;
			while ((line = reader.readLine()) != null) {
				sb.append(line);
			}
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			if (servletInputStream != null) {
				try {
					servletInputStream.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
			if (reader != null) {
				try {
					reader.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
		return sb.toString();
	}

	/**
	 * 获取 request 请求内容
	 *
	 * @param request request
	 * @return {String}
	 */
	public static String getRequestContent(HttpServletRequest request) {
		try {
			String queryString = request.getQueryString();
			if (StringUtil.isNotBlank(queryString)) {
				return new String(queryString.getBytes(Charsets.ISO_8859_1), Charsets.UTF_8).replaceAll("&amp;", "&").replaceAll("%22", "\"");
			}
			String charEncoding = request.getCharacterEncoding();
			if (charEncoding == null) {
				charEncoding = StringPool.UTF_8;
			}
			byte[] buffer = getRequestBody(request.getInputStream()).getBytes();
			String str = new String(buffer, charEncoding).trim();
			if (StringUtil.isBlank(str)) {
				StringBuilder sb = new StringBuilder();
				Enumeration<String> parameterNames = request.getParameterNames();
				while (parameterNames.hasMoreElements()) {
					String key = parameterNames.nextElement();
					String value = request.getParameter(key);
					StringUtil.appendBuilder(sb, key, "=", value, "&");
				}
				str = StringUtil.removeSuffix(sb.toString(), "&");
			}
			return str.replaceAll("&amp;", "&");
		} catch (Exception ex) {
			ex.printStackTrace();
			return StringPool.EMPTY;
		}
	}


}