package me.chanjar.weixin.cp.api.impl;

import com.google.common.base.Joiner;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
import me.chanjar.weixin.common.bean.WxJsapiSignature;
import me.chanjar.weixin.common.error.WxError;
import me.chanjar.weixin.common.error.WxErrorException;
import me.chanjar.weixin.common.session.StandardSessionManager;
import me.chanjar.weixin.common.session.WxSession;
import me.chanjar.weixin.common.session.WxSessionManager;
import me.chanjar.weixin.common.util.DataUtils;
import me.chanjar.weixin.common.util.RandomUtils;
import me.chanjar.weixin.common.util.crypto.SHA1;
import me.chanjar.weixin.common.util.http.RequestExecutor;
import me.chanjar.weixin.common.util.http.RequestHttp;
import me.chanjar.weixin.common.util.http.SimpleGetRequestExecutor;
import me.chanjar.weixin.common.util.http.SimplePostRequestExecutor;
import me.chanjar.weixin.cp.api.*;
import me.chanjar.weixin.cp.bean.WxCpMaJsCode2SessionResult;
import me.chanjar.weixin.cp.bean.WxCpMessage;
import me.chanjar.weixin.cp.bean.WxCpMessageSendResult;
import me.chanjar.weixin.cp.config.WxCpConfigStorage;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

/**
 * @author chanjarster
 */
public abstract class BaseWxCpServiceImpl<H, P> implements WxCpService, RequestHttp<H, P> {
  protected final Logger log = LoggerFactory.getLogger(this.getClass());

  private WxCpUserService userService = new WxCpUserServiceImpl(this);
  private WxCpChatService chatService = new WxCpChatServiceImpl(this);
  private WxCpDepartmentService departmentService = new WxCpDepartmentServiceImpl(this);
  private WxCpMediaService mediaService = new WxCpMediaServiceImpl(this);
  private WxCpMenuService menuService = new WxCpMenuServiceImpl(this);
  private WxCpOAuth2Service oauth2Service = new WxCpOAuth2ServiceImpl(this);
  private WxCpTagService tagService = new WxCpTagServiceImpl(this);
  private WxCpAgentService agentService = new WxCpAgentServiceImpl(this);
  private WxCpOAService oaService = new WxCpOAServiceImpl(this);
  private WxCpTaskCardService taskCardService = new WxCpTaskCardServiceImpl(this);

  /**
   * 全局的是否正在刷新access token的锁
   */
  protected final Object globalAccessTokenRefreshLock = new Object();

  /**
   * 全局的是否正在刷新jsapi_ticket的锁
   */
  protected final Object globalJsapiTicketRefreshLock = new Object();

  /**
   * 全局的是否正在刷新agent的jsapi_ticket的锁
   */
  protected final Object globalAgentJsapiTicketRefreshLock = new Object();

  protected WxCpConfigStorage configStorage;

  private WxSessionManager sessionManager = new StandardSessionManager();

  /**
   * 临时文件目录
   */
  private File tmpDirFile;
  private int retrySleepMillis = 1000;
  private int maxRetryTimes = 5;

  @Override
  public boolean checkSignature(String msgSignature, String timestamp, String nonce, String data) {
    try {
      return SHA1.gen(this.configStorage.getToken(), timestamp, nonce, data)
        .equals(msgSignature);
    } catch (Exception e) {
      this.log.error("Checking signature failed, and the reason is :" + e.getMessage());
      return false;
    }
  }

  @Override
  public String getAccessToken() throws WxErrorException {
    return getAccessToken(false);
  }

  @Override
  public String getAgentJsapiTicket() throws WxErrorException {
    return this.getAgentJsapiTicket(false);
  }

  @Override
  public String getAgentJsapiTicket(boolean forceRefresh) throws WxErrorException {
    if (forceRefresh) {
      this.configStorage.expireAgentJsapiTicket();
    }

    if (this.configStorage.isAgentJsapiTicketExpired()) {
      synchronized (this.globalAgentJsapiTicketRefreshLock) {
        if (this.configStorage.isAgentJsapiTicketExpired()) {
          String responseContent = this.get(WxCpService.GET_AGENT_CONFIG_TICKET, null);
          JsonObject jsonObject = new JsonParser().parse(responseContent).getAsJsonObject();
          this.configStorage.updateAgentJsapiTicket(jsonObject.get("ticket").getAsString(),
            jsonObject.get("expires_in").getAsInt());
        }
      }
    }

    return this.configStorage.getAgentJsapiTicket();
  }

  @Override
  public String getJsapiTicket() throws WxErrorException {
    return getJsapiTicket(false);
  }

  @Override
  public String getJsapiTicket(boolean forceRefresh) throws WxErrorException {
    if (forceRefresh) {
      this.configStorage.expireJsapiTicket();
    }

    if (this.configStorage.isJsapiTicketExpired()) {
      synchronized (this.globalJsapiTicketRefreshLock) {
        if (this.configStorage.isJsapiTicketExpired()) {
          String responseContent = this.get(WxCpService.GET_JSAPI_TICKET, null);
          JsonObject tmpJsonObject = new JsonParser().parse(responseContent).getAsJsonObject();
          this.configStorage.updateJsapiTicket(tmpJsonObject.get("ticket").getAsString(),
            tmpJsonObject.get("expires_in").getAsInt());
        }
      }
    }

    return this.configStorage.getJsapiTicket();
  }

  @Override
  public WxJsapiSignature createJsapiSignature(String url) throws WxErrorException {
    long timestamp = System.currentTimeMillis() / 1000;
    String noncestr = RandomUtils.getRandomStr();
    String jsapiTicket = getJsapiTicket(false);
    String signature = SHA1.genWithAmple(
      "jsapi_ticket=" + jsapiTicket,
      "noncestr=" + noncestr,
      "timestamp=" + timestamp,
      "url=" + url
    );
    WxJsapiSignature jsapiSignature = new WxJsapiSignature();
    jsapiSignature.setTimestamp(timestamp);
    jsapiSignature.setNonceStr(noncestr);
    jsapiSignature.setUrl(url);
    jsapiSignature.setSignature(signature);

    // Fixed bug
    jsapiSignature.setAppId(this.configStorage.getCorpId());

    return jsapiSignature;
  }

  @Override
  public WxCpMessageSendResult messageSend(WxCpMessage message) throws WxErrorException {
    Integer agentId = message.getAgentId();
    if (null == agentId) {
      message.setAgentId(this.getWxCpConfigStorage().getAgentId());
    }

    return WxCpMessageSendResult.fromJson(this.post(WxCpService.MESSAGE_SEND, message.toJson()));
  }

  @Override
  public WxCpMaJsCode2SessionResult jsCode2Session(String jsCode) throws WxErrorException {
    Map<String, String> params = new HashMap<>(2);
    params.put("js_code", jsCode);
    params.put("grant_type", "authorization_code");

    String result = this.get(JSCODE_TO_SESSION_URL, Joiner.on("&").withKeyValueSeparator("=").join(params));
    return WxCpMaJsCode2SessionResult.fromJson(result);
  }

  @Override
  public String[] getCallbackIp() throws WxErrorException {
    String responseContent = get(WxCpService.GET_CALLBACK_IP, null);
    JsonElement tmpJsonElement = new JsonParser().parse(responseContent);
    JsonArray jsonArray = tmpJsonElement.getAsJsonObject().get("ip_list").getAsJsonArray();
    String[] ips = new String[jsonArray.size()];
    for (int i = 0; i < jsonArray.size(); i++) {
      ips[i] = jsonArray.get(i).getAsString();
    }
    return ips;
  }

  @Override
  public String get(String url, String queryParam) throws WxErrorException {
    return execute(SimpleGetRequestExecutor.create(this), url, queryParam);
  }

  @Override
  public String post(String url, String postData) throws WxErrorException {
    return execute(SimplePostRequestExecutor.create(this), url, postData);
  }

  /**
   * 向微信端发送请求，在这里执行的策略是当发生access_token过期时才去刷新，然后重新执行请求，而不是全局定时请求.
   */
  @Override
  public <T, E> T execute(RequestExecutor<T, E> executor, String uri, E data) throws WxErrorException {
    int retryTimes = 0;
    do {
      try {
        return this.executeInternal(executor, uri, data);
      } catch (WxErrorException e) {
        if (retryTimes + 1 > this.maxRetryTimes) {
          this.log.warn("重试达到最大次数【{}】", this.maxRetryTimes);
          //最后一次重试失败后，直接抛出异常，不再等待
          throw new RuntimeException("微信服务端异常，超出重试次数");
        }

        WxError error = e.getError();
        /*
         * -1 系统繁忙, 1000ms后重试
         */
        if (error.getErrorCode() == -1) {
          int sleepMillis = this.retrySleepMillis * (1 << retryTimes);
          try {
            this.log.debug("微信系统繁忙，{} ms 后重试(第{}次)", sleepMillis, retryTimes + 1);
            Thread.sleep(sleepMillis);
          } catch (InterruptedException e1) {
            Thread.currentThread().interrupt();
          }
        } else {
          throw e;
        }
      }
    } while (retryTimes++ < this.maxRetryTimes);

    this.log.warn("重试达到最大次数【{}】", this.maxRetryTimes);
    throw new RuntimeException("微信服务端异常，超出重试次数");
  }

  protected <T, E> T executeInternal(RequestExecutor<T, E> executor, String uri, E data) throws WxErrorException {
    E dataForLog = DataUtils.handleDataWithSecret(data);

    if (uri.contains("access_token=")) {
      throw new IllegalArgumentException("uri参数中不允许有access_token: " + uri);
    }
    String accessToken = getAccessToken(false);

    String uriWithAccessToken = uri + (uri.contains("?") ? "&" : "?") + "access_token=" + accessToken;

    try {
      T result = executor.execute(uriWithAccessToken, data);
      this.log.debug("\n【请求地址】: {}\n【请求参数】：{}\n【响应数据】：{}", uriWithAccessToken, dataForLog, result);
      return result;
    } catch (WxErrorException e) {
      WxError error = e.getError();
      /*
       * 发生以下情况时尝试刷新access_token
       * 40001 获取access_token时AppSecret错误，或者access_token无效
       * 42001 access_token超时
       * 40014 不合法的access_token，请开发者认真比对access_token的有效性（如是否过期），或查看是否正在为恰当的公众号调用接口
       */
      if (error.getErrorCode() == 42001 || error.getErrorCode() == 40001 || error.getErrorCode() == 40014) {
        // 强制设置wxCpConfigStorage它的access token过期了，这样在下一次请求里就会刷新access token
        this.configStorage.expireAccessToken();
        return execute(executor, uri, data);
      }

      if (error.getErrorCode() != 0) {
        this.log.error("\n【请求地址】: {}\n【请求参数】：{}\n【错误信息】：{}", uriWithAccessToken, dataForLog, error);
        throw new WxErrorException(error, e);
      }
      return null;
    } catch (IOException e) {
      this.log.error("\n【请求地址】: {}\n【请求参数】：{}\n【异常信息】：{}", uriWithAccessToken, dataForLog, e.getMessage());
      throw new RuntimeException(e);
    }
  }

  @Override
  public void setWxCpConfigStorage(WxCpConfigStorage wxConfigProvider) {
    this.configStorage = wxConfigProvider;
    this.initHttp();
  }

  @Override
  public void setRetrySleepMillis(int retrySleepMillis) {
    this.retrySleepMillis = retrySleepMillis;
  }


  @Override
  public void setMaxRetryTimes(int maxRetryTimes) {
    this.maxRetryTimes = maxRetryTimes;
  }

  @Override
  public WxSession getSession(String id) {
    if (this.sessionManager == null) {
      return null;
    }
    return this.sessionManager.getSession(id);
  }

  @Override
  public WxSession getSession(String id, boolean create) {
    if (this.sessionManager == null) {
      return null;
    }
    return this.sessionManager.getSession(id, create);
  }

  @Override
  public void setSessionManager(WxSessionManager sessionManager) {
    this.sessionManager = sessionManager;
  }

  @Override
  public WxSessionManager getSessionManager() {
    return this.sessionManager;
  }

  @Override
  public String replaceParty(String mediaId) throws WxErrorException {
    JsonObject jsonObject = new JsonObject();
    jsonObject.addProperty("media_id", mediaId);
    return post(WxCpService.BATCH_REPLACE_PARTY, jsonObject.toString());
  }

  @Override
  public String replaceUser(String mediaId) throws WxErrorException {
    JsonObject jsonObject = new JsonObject();
    jsonObject.addProperty("media_id", mediaId);
    return post(WxCpService.BATCH_REPLACE_USER, jsonObject.toString());
  }

  @Override
  public String getTaskResult(String joinId) throws WxErrorException {
    String url = WxCpService.BATCH_GET_RESULT + joinId;
    return get(url, null);
  }

  public File getTmpDirFile() {
    return this.tmpDirFile;
  }

  public void setTmpDirFile(File tmpDirFile) {
    this.tmpDirFile = tmpDirFile;
  }

  @Override
  public WxCpDepartmentService getDepartmentService() {
    return departmentService;
  }

  @Override
  public WxCpMediaService getMediaService() {
    return mediaService;
  }

  @Override
  public WxCpMenuService getMenuService() {
    return menuService;
  }

  @Override
  public WxCpOAuth2Service getOauth2Service() {
    return oauth2Service;
  }

  @Override
  public WxCpTagService getTagService() {
    return tagService;
  }

  @Override
  public WxCpUserService getUserService() {
    return userService;
  }

  @Override
  public WxCpChatService getChatService() {
    return chatService;
  }

  @Override
  public WxCpOAService getOAService() {
    return oaService;
  }

  @Override
  public WxCpTaskCardService getTaskCardService() {
    return taskCardService;
  }

  @Override
  public RequestHttp<?, ?> getRequestHttp() {
    return this;
  }

  @Override
  public void setUserService(WxCpUserService userService) {
    this.userService = userService;
  }

  @Override
  public void setDepartmentService(WxCpDepartmentService departmentService) {
    this.departmentService = departmentService;
  }

  @Override
  public void setMediaService(WxCpMediaService mediaService) {
    this.mediaService = mediaService;
  }

  @Override
  public void setMenuService(WxCpMenuService menuService) {
    this.menuService = menuService;
  }

  @Override
  public void setOauth2Service(WxCpOAuth2Service oauth2Service) {
    this.oauth2Service = oauth2Service;
  }

  @Override
  public void setTagService(WxCpTagService tagService) {
    this.tagService = tagService;
  }

  @Override
  public WxCpAgentService getAgentService() {
    return agentService;
  }

  public void setAgentService(WxCpAgentService agentService) {
    this.agentService = agentService;
  }
}
