/* eslint-disable @typescript-eslint/no-unused-vars */
class GleapNetworkIntercepter {
  requestId = 0;
  requests: any = {};
  maxRequests = 25;
  stopped = false;
  updatedCallback: any = null;

  setUpdatedCallback(updatedCallback: any) {
    this.updatedCallback = updatedCallback;
  }

  getRequests() {
    return Object.values(this.requests);
  }

  setMaxRequests(maxRequests: number) {
    this.maxRequests = maxRequests;
  }

  setStopped(stopped: boolean) {
    this.stopped = stopped;
  }

  cleanRequests() {
    var keys = Object.keys(this.requests);
    if (keys.length > this.maxRequests) {
      var keysToRemove = keys.slice(0, keys.length - this.maxRequests);
      for (var i = 0; i < keysToRemove.length; i++) {
        delete this.requests[keysToRemove[i]];
      }
    }

    if (this.updatedCallback) {
      this.updatedCallback();
    }
  }

  calcRequestTime(gleapRequestId: string | number) {
    if (!this.requests[gleapRequestId]) {
      return;
    }

    var startDate = this.requests[gleapRequestId].date;
    if (
      startDate &&
      typeof startDate.getTime === 'function' &&
      !Object.isFrozen(this.requests[gleapRequestId])
    ) {
      this.requests[gleapRequestId].duration =
        new Date().getTime() - startDate.getTime();
      this.requests[gleapRequestId].date =
        this.requests[gleapRequestId].date.toString();
    }
  }

  getTextContentSizeOk(text: string) {
    if (text && text.length) {
      const size = text.length * 16;
      const kiloBytes = size / 1024;
      const megaBytes = kiloBytes / 1024;
      if (megaBytes < 0.2) {
        return true;
      }
    }
    return false;
  }

  prepareContent(text: string) {
    if (!this.getTextContentSizeOk(text)) {
      return '<content_too_large>';
    }

    return text;
  }

  cleanupPayload(payload: any) {
    if (payload === undefined || payload === null) {
      return '{}';
    }

    try {
      if (ArrayBuffer.isView(payload)) {
        return `{ type: "binary", length: ${payload.byteLength} }`;
      }
    } catch (exp) {}

    return payload;
  }

  preparePayload(payload: any) {
    var payloadText = this.cleanupPayload(payload);
    return this.prepareContent(payloadText);
  }

  start() {
    this.setStopped(false);
    this.interceptNetworkRequests({
      onFetch: (params: any[], gleapRequestId: any) => {
        if (this.stopped || params.length === 0) {
          return;
        }

        if (params.length >= 2 && params[1] !== undefined) {
          var method = params[1].method ? params[1].method : 'GET';
          this.requests[gleapRequestId] = {
            request: {
              payload: this.preparePayload(params[1].body),
              headers: params[1].headers,
            },
            type: method,
            url: params[0],
            date: new Date(),
          };
        } else {
          this.requests[gleapRequestId] = {
            request: {},
            url: params[0],
            type: 'GET',
            date: new Date(),
          };
        }

        this.cleanRequests();
      },
      onFetchLoad: (req: any, gleapRequestId: any) => {
        if (
          this.stopped ||
          !gleapRequestId ||
          !this.requests ||
          !this.requests[gleapRequestId]
        ) {
          return;
        }

        try {
          this.requests[gleapRequestId].success = true;
          this.requests[gleapRequestId].response = {
            status: req.status,
            statusText: '',
            responseText: '<request_still_open>',
          };
          this.calcRequestTime(gleapRequestId);
        } catch (exp) {}

        req
          .text()
          .then((responseText: any) => {
            if (this.requests && this.requests[gleapRequestId]) {
              this.requests[gleapRequestId].success = true;
              this.requests[gleapRequestId].response = {
                status: req.status,
                statusText: req.statusText,
                responseText: this.prepareContent(responseText),
              };

              this.calcRequestTime(gleapRequestId);
              this.cleanRequests();
            }
          })
          .catch((_err: any) => {
            if (this) {
              this.cleanRequests();
            }
          });
      },
      onFetchFailed: (_err: any, gleapRequestId: any) => {
        if (this.stopped || !gleapRequestId) {
          return;
        }

        if (this.requests && this.requests[gleapRequestId]) {
          this.requests[gleapRequestId].success = false;
          this.calcRequestTime(gleapRequestId);
        }
        this.cleanRequests();
      },
      onOpen: (request: any, args: string | any[]) => {
        if (this.stopped) {
          return;
        }

        if (
          request &&
          request.gleapRequestId &&
          args.length >= 2 &&
          this.requests
        ) {
          this.requests[request.gleapRequestId] = {
            type: args[0],
            url: args[1],
            date: new Date(),
          };
        }

        this.cleanRequests();
      },
      onSend: (request: any, args: string | any[]) => {
        if (this.stopped) {
          return;
        }

        if (
          request &&
          request.gleapRequestId &&
          this.requests &&
          this.requests[request.gleapRequestId]
        ) {
          this.requests[request.gleapRequestId].request = {
            payload: this.preparePayload(args.length > 0 ? args[0] : ''),
            headers: request.requestHeaders,
          };
        }

        this.cleanRequests();
      },
      onError: (request: any) => {
        if (
          !this.stopped &&
          this.requests &&
          request &&
          request.gleapRequestId &&
          this.requests[request.gleapRequestId]
        ) {
          this.requests[request.gleapRequestId].success = false;
          this.calcRequestTime(request.gleapRequestId);
        }

        this.cleanRequests();
      },
      onLoad: (request: any) => {
        if (this.stopped) {
          return;
        }

        if (
          request &&
          request.gleapRequestId &&
          this.requests &&
          this.requests[request.gleapRequestId]
        ) {
          const contentType = request.getResponseHeader('content-type');
          const isTextOrJSON =
            contentType &&
            (contentType.includes('json') || contentType.includes('text'));

          var responseText = '<' + contentType + '>';
          if (request.responseType === '' || request.responseType === 'text') {
            responseText = request.responseText;
          }
          if (request._response && isTextOrJSON) {
            responseText = request._response;
          }

          this.requests[request.gleapRequestId].success = true;
          this.requests[request.gleapRequestId].response = {
            status: request.status,
            responseText: this.prepareContent(responseText),
          };

          this.calcRequestTime(request.gleapRequestId);
        }

        this.cleanRequests();
      },
    });
  }

  interceptNetworkRequests(callback: any) {
    // eslint-disable-next-line consistent-this
    var self = this;

    // @ts-ignore
    if (XMLHttpRequest.prototype.gleapTouched) {
      return;
    }

    // @ts-ignore
    XMLHttpRequest.prototype.gleapTouched = true;

    // XMLHttpRequest
    const open = XMLHttpRequest.prototype.open;
    const send = XMLHttpRequest.prototype.send;

    // @ts-ignore
    XMLHttpRequest.prototype.wrappedSetRequestHeader =
      XMLHttpRequest.prototype.setRequestHeader;
    XMLHttpRequest.prototype.setRequestHeader = function (header, value) {
      // @ts-ignore
      if (!this.requestHeaders) {
        // @ts-ignore
        this.requestHeaders = {};
      }

      // @ts-ignore
      if (this.requestHeaders && this.requestHeaders.hasOwnProperty(header)) {
        return;
      }

      // @ts-ignore
      if (!this.requestHeaders[header]) {
        // @ts-ignore
        this.requestHeaders[header] = [];
      }

      // @ts-ignore
      this.requestHeaders[header].push(value);
      // @ts-ignore
      this.wrappedSetRequestHeader(header, value);
    };

    XMLHttpRequest.prototype.open = function () {
      (this as any).gleapRequestId = ++self.requestId;
      callback.onOpen && callback.onOpen(this, arguments);

      if (callback.onLoad) {
        this.addEventListener('load', function () {
          // @ts-ignore
          callback.onLoad(this);
        });
      }
      if (callback.onError) {
        this.addEventListener('error', function () {
          // @ts-ignore
          callback.onError(this);
        });
      }

      // @ts-ignore
      return open.apply(this, arguments);
    };

    XMLHttpRequest.prototype.send = function () {
      callback.onSend && callback.onSend(this, arguments);
      // @ts-ignore
      return send.apply(this, arguments);
    };

    // Fetch
    if (global) {
      (function () {
        var originalFetch = global.fetch;
        global.fetch = function () {
          var gleapRequestId = ++self.requestId;
          callback.onFetch(arguments, gleapRequestId);

          return (
            originalFetch
              // @ts-ignore
              .apply(this, arguments)
              .then(function (response) {
                if (response && typeof response.clone === 'function') {
                  const data = response.clone();
                  callback.onFetchLoad(data, gleapRequestId);
                }

                return response;
              })
              .catch((err) => {
                callback.onFetchFailed(err, gleapRequestId);
                throw err;
              })
          );
        };
      })();
    }

    return callback;
  }
}

export default GleapNetworkIntercepter;