package cc.mrbird.febs.common.utils;

import cc.mrbird.febs.common.entity.CurrentUser;
import cc.mrbird.febs.common.entity.constant.PageConstant;
import com.alibaba.fastjson.JSONObject;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.fasterxml.jackson.databind.ObjectMapper;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.oauth2.provider.OAuth2Authentication;
import org.springframework.security.oauth2.provider.authentication.OAuth2AuthenticationDetails;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import reactor.core.publisher.Mono;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.stream.IntStream;

/**
 * FEBS工具类
 *
 * @author MrBird
 */
@Slf4j
public class FebsUtil {

    /**
     * 驼峰转下划线
     *
     * @param value 待转换值
     * @return 结果
     */
    public static String camelToUnderscore(String value) {
        if (StringUtils.isBlank(value))
            return value;
        String[] arr = StringUtils.splitByCharacterTypeCamelCase(value);
        if (arr.length == 0)
            return value;
        StringBuilder result = new StringBuilder();
        IntStream.range(0, arr.length).forEach(i -> {
            if (i != arr.length - 1)
                result.append(arr[i]).append("_");
            else
                result.append(arr[i]);
        });
        return StringUtils.lowerCase(result.toString());
    }

    /**
     * 下划线转驼峰
     *
     * @param value 待转换值
     * @return 结果
     */
    public static String underscoreToCamel(String value) {
        StringBuilder result = new StringBuilder();
        String[] arr = value.split("_");
        for (String s : arr) {
            result.append((String.valueOf(s.charAt(0))).toUpperCase()).append(s.substring(1));
        }
        return result.toString();
    }

    /**
     * 判断是否为 ajax请求
     *
     * @param request HttpServletRequest
     * @return boolean
     */
    public static boolean isAjaxRequest(HttpServletRequest request) {
        return (request.getHeader("X-Requested-With") != null
                && "XMLHttpRequest".equals(request.getHeader("X-Requested-With")));
    }

    /**
     * 正则校验
     *
     * @param regex 正则表达式字符串
     * @param value 要匹配的字符串
     * @return 正则校验结果
     */
    public static boolean match(String regex, String value) {
        Pattern pattern = Pattern.compile(regex);
        Matcher matcher = pattern.matcher(value);
        return matcher.matches();
    }

    /**
     * 设置响应
     *
     * @param response    HttpServletResponse
     * @param contentType content-type
     * @param status      http状态码
     * @param value       响应内容
     * @throws IOException IOException
     */
    public static void makeResponse(HttpServletResponse response, String contentType,
                                    int status, Object value) throws IOException {
        response.setContentType(contentType);
        response.setStatus(status);
        response.getOutputStream().write(JSONObject.toJSONString(value).getBytes());
    }

    /**
     * 设置webflux模型响应
     *
     * @param response    ServerHttpResponse
     * @param contentType content-type
     * @param status      http状态码
     * @param value       响应内容
     * @return Mono<Void>
     */
    public static Mono<Void> makeWebFluxResponse(ServerHttpResponse response, String contentType,
                                                 HttpStatus status, Object value) {
        response.setStatusCode(status);
        response.getHeaders().add(HttpHeaders.CONTENT_TYPE, contentType);
        DataBuffer dataBuffer = response.bufferFactory().wrap(JSONObject.toJSONString(value).getBytes());
        return response.writeWith(Mono.just(dataBuffer));
    }

    /**
     * 封装前端分页表格所需数据
     *
     * @param pageInfo pageInfo
     * @return Map<String, Object>
     */
    public static Map<String, Object> getDataTable(IPage<?> pageInfo) {
        Map<String, Object> data = new HashMap<>();
        data.put(PageConstant.ROWS, pageInfo.getRecords());
        data.put(PageConstant.TOTAL, pageInfo.getTotal());
        return data;
    }

    /**
     * 获取HttpServletRequest
     *
     * @return HttpServletRequest
     */
    public static HttpServletRequest getHttpServletRequest() {
        return ((ServletRequestAttributes) Objects.requireNonNull(RequestContextHolder.getRequestAttributes())).getRequest();
    }

    /**
     * 获取请求IP
     *
     * @return String IP
     */
    public static String getHttpServletRequestIpAddress() {
        HttpServletRequest request = getHttpServletRequest();
        String ip = request.getHeader("x-forwarded-for");
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("WL-Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
        }
        return "0:0:0:0:0:0:0:1".equals(ip) ? "127.0.0.1" : ip;
    }

    /**
     * 获取请求IP
     *
     * @param request ServerHttpRequest
     * @return String IP
     */
    public static String getServerHttpRequestIpAddress(ServerHttpRequest request) {
        HttpHeaders headers = request.getHeaders();
        String ip = headers.getFirst("x-forwarded-for");
        if (ip != null && ip.length() != 0 && !"unknown".equalsIgnoreCase(ip)) {
            if (ip.contains(",")) {
                ip = ip.split(",")[0];
            }
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = headers.getFirst("Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = headers.getFirst("WL-Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = headers.getFirst("HTTP_CLIENT_IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = headers.getFirst("HTTP_X_FORWARDED_FOR");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = headers.getFirst("X-Real-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = Objects.requireNonNull(request.getRemoteAddress()).getAddress().getHostAddress();
        }
        return "0:0:0:0:0:0:0:1".equals(ip) ? "127.0.0.1" : ip;
    }

    /**
     * 判断是否包含中文
     *
     * @param value 内容
     * @return 结果
     */
    public static boolean containChinese(String value) {
        Pattern p = Pattern.compile("[\u4e00-\u9fa5]");
        Matcher m = p.matcher(value);
        return m.find();
    }

    /**
     * 获取在线用户信息
     *
     * @return CurrentUser 当前用户信息
     */
    public static CurrentUser getCurrentUser() {
        try {
            LinkedHashMap<String, Object> authenticationDetails = getAuthenticationDetails();
            Object principal = authenticationDetails.get("principal");
            ObjectMapper mapper = new ObjectMapper();
            return mapper.readValue(mapper.writeValueAsString(principal), CurrentUser.class);
        } catch (Exception e) {
            log.error("获取当前用户信息失败", e);
            return null;
        }
    }

    /**
     * 获取当前用户名称
     *
     * @return String 用户名
     */
    public static String getCurrentUsername() {
        return (String) getOAuth2Authentication().getPrincipal();
    }

    /**
     * 获取当前用户权限集
     *
     * @return Collection<GrantedAuthority>权限集
     */
    public static Collection<GrantedAuthority> getCurrentUserAuthority() {
        return getOAuth2Authentication().getAuthorities();
    }

    /**
     * 获取当前令牌内容
     *
     * @return String 令牌内容
     */
    public static String getCurrentTokenValue() {
        OAuth2AuthenticationDetails details = (OAuth2AuthenticationDetails) getOAuth2Authentication().getDetails();
        return details.getTokenValue();
    }

    private static OAuth2Authentication getOAuth2Authentication() {
        Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
        return (OAuth2Authentication) authentication;
    }

    @SuppressWarnings("all")
    private static LinkedHashMap<String, Object> getAuthenticationDetails() {
        return (LinkedHashMap<String, Object>) getOAuth2Authentication().getUserAuthentication().getDetails();
    }
}