#ifndef WEBSERVER_H
#define WEBSERVER_H

#include "TCPServer.h"
#include "Dictionary.h"
#include "SDCardManager.h"
#include "HttpConstants.h"
//#define DEBUG_WEBS
#define READ_WRITE_BUFFER_SIZE 2000

template <typename T>
class WEBServer : public TCPServer<T>, public HttpConstants
{
	public:
		enum HttpParserStatus {HTTP_VERB, HTTP_RESSOURCE, HTTP_VERSION, HTTP_PARAMS, POST_DATA, HEADER_PARAMS};
    enum WEBClientState {ACCEPTED, PARSING, QUERY_PARSED, RESPONSE_SENT, DONE};
    
    struct HttpRequestData
    {
      HttpRequestMethod HRM;
      HttpVersion HV;
      HttpMIMEType HMT;
      
      Dictionary<DictionaryHelper::StringEntity> getParams;
      char *getParamsDataPointer; //Used in the getParams algorithm
      Dictionary<DictionaryHelper::StringEntity> postParams;
      char *postParamsDataPointer; //Used in the postParams algorithm
      
      char *httpResource;
      uint16_t maxResourceBuffer;
      char *httpBody;
      uint16_t maxBodyBuffer;
    };
    
    WEBServer(uint16_t port = 80, SDCardManager *sdCardManager = NULL, uint8_t maxClient = MAX_CLIENT, uint16_t clientDataBufferSize = 255) : TCPServer<T>(port, maxClient, clientDataBufferSize), _sdCardManager(sdCardManager) {}

    boolean addApiRoutine(const char *uri, boolean (*apiRoutine)(HttpRequestData&, WiFiClient*, void*), void *pData, HttpRequestMethod HRM = UNDEFINED)
    {
      return _apiDictionary.add(uri, new ApiRoutine({apiRoutine, pData, HRM}));
    }

    void clearApiRoutine() { _apiDictionary.clear(); };
    
    boolean removeApiRoutine(const char* uri)
    {
      return _apiDictionary.remove(uri);
    }

    //Helper function used for the webApi
    static void injectApiHeader(char *header, const char *contentType, char *content)
    {
      char *buffer = (char *)malloc(sizeof(char) * strlen(content) + 1);
      if(buffer != NULL)
      {
        strcpy(buffer, content);
        sprintf(header,"HTTP/1.1 200 OK\r\nContent-Type: %s\r\nContent-Length: %d\r\n\r\n%s",contentType,strlen(buffer), buffer);
        free(buffer);
      }
    }
	protected:
	private:
    virtual T* createNewClient(WiFiClient wc)
    {
      return new T(wc, TCPServer<T>::freeClientId(), TCPServer<T>::_clientDataBufferSize);
    }
    
    virtual void greetClient(T *client)
    {
  
    }
    
		virtual void processClientData(T *client)
    {
      if(client->_dataSize > 0)
      {
        switch(client->_WEBClientState)
        {
          case ACCEPTED:
            #ifdef DEBUG_WEBS
            Serial.println("WEBServer : ACCEPTED");
            #endif
            client->_WEBClientState = WEBClientState::PARSING;
            break;
          case PARSING:
            queryParser(client);
            break;
          case QUERY_PARSED:
            #ifdef DEBUG_WEBS
            Serial.println("WEBServer : QUERY_PARSED");
            #endif
            sendDataToClient(client);
            break;
          case RESPONSE_SENT:
            #ifdef DEBUG_WEBS
            Serial.println("WEBServer : RESPONSE_SENT");
            #endif
            client->_WEBClientState = WEBClientState::DONE;
            break;
          case DONE:
            #ifdef DEBUG_WEBS
            Serial.println("WEBServer : DONE");
            #endif
            client->_clientState = TCPClient::ClientState::DISCARDED;
            break;
        }
      }
    }

    void queryParser(T *client)
    {
        switch(client->_httpParserState)
        {
          case HttpParserStatus::HTTP_VERB:
          {
            #ifdef DEBUG_WEBS
            Serial.println((char *)client->_data);
            #endif
            
            char *pVerb = strstr((char *)client->_data, " ");
            
            if(pVerb != NULL)
            {
              *pVerb = '\0';
              client->_httpRequestData.HRM = getHttpVerbEnumValue((char *)client->_data);
              client->freeDataBuffer((pVerb - (char *)client->_data) +1);

              if(client->_httpRequestData.HRM == HttpRequestMethod::UNDEFINED) //Error 400
              {
                sendInfoResponse(HTTP_CODE::HTTP_CODE_BAD_REQUEST, client, "The server could not understand the request due to invalid syntax");
                client->_clientState = TCPClient::ClientState::DISCARDED;
                break;
              }
              
              #ifdef DEBUG_WEBS
              Serial.print("Verb : ");Serial.println(client->_httpRequestData.HRM);
              Serial.println((char *)client->_data);
              #endif
              
              client->_httpParserState = HttpParserStatus::HTTP_RESSOURCE;
            }
            else
            {
              sendInfoResponse(HTTP_CODE::HTTP_CODE_BAD_REQUEST, client, "The server could not understand the request due to invalid syntax");
              client->_clientState = TCPClient::ClientState::DISCARDED;
            }
          } 
            break;
          case HttpParserStatus::HTTP_RESSOURCE:
          {
            char *pRsrc = strstr((char *)client->_data, " ");
          
            if(pRsrc != NULL)
            {
              *pRsrc = '\0';
              uint16_t safeLength = pRsrc - (char *)client->_data <= client->_httpRequestData.maxResourceBuffer ? pRsrc - (char *)client->_data : client->_httpRequestData.maxResourceBuffer;

              #ifdef DEBUG_WEBS
              Serial.print("Resrc length : ");Serial.println(safeLength);
              #endif

              client->_httpRequestData.httpResource = (char *) malloc(sizeof(char) * (safeLength+1) ); //for \0
              if(client->_httpRequestData.httpResource != NULL)
              {
                strncpy(client->_httpRequestData.httpResource, (char *)client->_data, safeLength);
                client->_httpRequestData.httpResource[safeLength] = '\0';
              }
              else //Error 500
              {
                sendInfoResponse(HTTP_CODE::HTTP_CODE_INTERNAL_SERVER_ERROR, client, "Failed to allocate memory for resources");
                client->_clientState = TCPClient::ClientState::DISCARDED;
                break;
              }
              
              client->freeDataBuffer(safeLength + 1);
                
              #ifdef DEBUG_WEBS
              Serial.print("Resrc : ");Serial.println(client->_httpRequestData.httpResource);
              Serial.println((char *)client->_data);
              #endif
            }
            else //Resource is probably too long, so we truncate it
            {
              client->_httpRequestData.httpResource = (char *) malloc(sizeof(char) * (client->_httpRequestData.maxResourceBuffer+1) ); //for \0
              if(client->_httpRequestData.httpResource != NULL)
              {
                strncpy(client->_httpRequestData.httpResource, (char *)client->_data, client->_httpRequestData.maxResourceBuffer);
                client->_httpRequestData.httpResource[client->_httpRequestData.maxResourceBuffer] = '\0';
              }
              else //Error 500
              {
                sendInfoResponse(HTTP_CODE::HTTP_CODE_INTERNAL_SERVER_ERROR, client, "Failed to allocate memory for resources");
                client->_clientState = TCPClient::ClientState::DISCARDED;
                break;
              }
              
              client->freeDataBuffer(client->_httpRequestData.maxResourceBuffer + 1);
            }
            client->_httpParserState = HttpParserStatus::HTTP_PARAMS;
          }
            break;
          case HttpParserStatus::HTTP_VERSION:
          {
            char *pEndline = strstr((char *)client->_data, "\r\n");
            
            if(pEndline == NULL) pEndline = strstr((char *)client->_data, "\n");
            
            char *pVers = strstr((char *)client->_data, "HTTP/");
            
            if(pEndline != NULL && pVers!= NULL)
            {
              *pEndline = '\0';
              client->_httpRequestData.HV = getHttpVersionEnumValue(pVers+5);
              
              #ifdef DEBUG_WEBS
              Serial.print("Vers : ");Serial.println(pVers+5);
              Serial.print("Vers : ");Serial.println(client->_httpRequestData.HV);
              #endif
              
              client->freeDataBuffer((pEndline - (char *)client->_data)+2);

              #ifdef DEBUG_WEBS
              Serial.println((char *)client->_data);
              #endif
              
              client->_httpParserState = HttpParserStatus::HEADER_PARAMS;
            }
          }
            break;
          case  HttpParserStatus::HTTP_PARAMS: //index.htm?var1=1&var2=2...
            if(!httpRsrcParamParser(client))
            {
              #ifdef DEBUG_WEBS
              Serial.print("Resrc : ");Serial.println(client->_httpRequestData.httpResource);
              Serial.println("Get params :");
              for(int i = 0; i < client->_httpRequestData.getParams.count(); i++)
              {
                Serial.print(client->_httpRequestData.getParams.getParameter(i));Serial.print(" : ");Serial.println(client->_httpRequestData.getParams.getAt(i)->getString());
              }
              #endif
              client->_httpParserState = HttpParserStatus::HTTP_VERSION;
            }
            break;
          case HttpParserStatus::HEADER_PARAMS: //Here we parse the different header params until we arrive to \r\n\r\n
            {
              char *pEndLine = strstr((char *)client->_data, "\r\n");

              if( pEndLine != NULL )
              {   
                *pEndLine = '\0';

                httpHeaderParamParser(client);
                
                if(*(pEndLine+2) == '\r') //We got \r\n\r\n -> so we go to the post data section
                {
                  client->_httpParserState = HttpParserStatus::POST_DATA;
                  client->freeDataBuffer((pEndLine - (char *)client->_data) +3); //client->_data must not be empty...
                  break;
                }

                //Before in the buffer : key1: value1\0\nkey2: value2
                //After in the buffer : key2: value2\r\n
                client->freeDataBuffer((pEndLine - (char *)client->_data) + 2);
              }
              else //Error : indeed, we should at least have : \r\n. We go to the next step anyway
              {
                client->_httpParserState = HttpParserStatus::POST_DATA;
              }
            }
            break;
          case  HttpParserStatus::POST_DATA:
          
              switch(client->_httpRequestData.HMT)
              {
                case APPLICATION_X_WWW_FORM_URLENCODED:
                  #ifdef DEBUG_WEBS
                  Serial.printf("Post data : APPLICATION_X_WWW_FORM_URLENCODED\n");
                  Serial.printf("Post data : %s\n", client->_data);
                  #endif
                  
                  //we parse it !
                  if(!httpPostParamParser(client))
                  {
                    //Parsing done!
                    #ifdef DEBUG_WEBS
                    Serial.println("Post params :");
                    for(int i = 0; i < client->_httpRequestData.postParams.count(); i++)
                    {
                      Serial.print(client->_httpRequestData.postParams.getParameter(i));Serial.print(" : ");Serial.println(client->_httpRequestData.postParams.getAt(i)->getString());
                    }
                    #endif
                    client->_WEBClientState = WEBClientState::QUERY_PARSED;
                  }
                  
                  break;
                default :
                  client->_WEBClientState = WEBClientState::QUERY_PARSED;
              }
              
            break;
          default :
            sendInfoResponse(HTTP_CODE::HTTP_CODE_INTERNAL_SERVER_ERROR, client, "WEB server error");
            client->_clientState = TCPClient::ClientState::DISCARDED;
            break;
        }
    }

    /*
     * This function parses the header parameters in order to find particular parameters.
     * For example we look for the "Content-Type" header or for the "Range: bytes=" header
     */
    void httpHeaderParamParser(T *client)
    {
      #ifdef DEBUG_WEBS
      Serial.printf("Header param : %s\n",(char *)client->_data);
      #endif

      //Here we check if we have interesting params
      char *contentTypeP = strstr((char *)client->_data, "t-Type: application/x-www-form-urlen");

      if(contentTypeP != NULL)
      {
        #ifdef DEBUG_WEBS
        Serial.printf("Data is of type : APPLICATION_X_WWW_FORM_URLENCODED\n");
        #endif
        client->_httpRequestData.HMT = APPLICATION_X_WWW_FORM_URLENCODED;
      }
      
      //Range part for file downloads
      /*char *startingP = strstr((char *)client->_data, "nge: bytes="), *endP = strchr((char *)client->_data, '-');

      if(startingP != NULL && endP != NULL)
      {
        endP = '\0';
        client->_range = strtoul(startingP + 11,NULL, 10);
        #ifdef DEBUG_WEBS
        Serial.printf("Range : %d\n", client->_range);
        #endif
      }*/
    }

    /*
     * This function is here to parse resources parameters
     */
    boolean httpRsrcParamParser(T *client)
    {
      char *pGetParam = strchr((char *)client->_httpRequestData.httpResource, '?');
      
      
      if(pGetParam != NULL) //There are some params to be parsed
      {
        if(client->_httpRequestData.getParamsDataPointer == NULL)
        {
          client->_httpRequestData.getParamsDataPointer = pGetParam +1;//We save the starting position of the string to parse
        }
          
        char *key = strchr(client->_httpRequestData.getParamsDataPointer, '=');
        char *value = strchr(client->_httpRequestData.getParamsDataPointer, '&');

        if(key == NULL && value == NULL) //Only the key is present
        {
          client->_httpRequestData.getParams.add(client->_httpRequestData.getParamsDataPointer, new DictionaryHelper::StringEntity(NULL));
          *pGetParam = '\0';
          return false;
        }
        else if(key != NULL && value != NULL)
        {
          if(key < value)*key = '\0';
          *value = '\0';
          
          client->_httpRequestData.getParams.add(client->_httpRequestData.getParamsDataPointer, new DictionaryHelper::StringEntity(key > value ? NULL : key + 1));
          memmove(client->_httpRequestData.getParamsDataPointer, value+1, strlen(value+1)+1);
          
          #ifdef DEBUG_WEBS
          Serial.print("Params pointer : ");Serial.println(client->_httpRequestData.getParamsDataPointer);
          #endif
        }
        else if(key != NULL && value == NULL) //Only one key/value pair present
        {
          *key = '\0';
          
          client->_httpRequestData.getParams.add(client->_httpRequestData.getParamsDataPointer, new DictionaryHelper::StringEntity(key+1));
          *pGetParam = '\0';
          return false;
        }
        else if(key == NULL && value != NULL)
        {
          *value = '\0';

          client->_httpRequestData.getParams.add(client->_httpRequestData.getParamsDataPointer, new DictionaryHelper::StringEntity(NULL));
          memmove(client->_httpRequestData.getParamsDataPointer, value+1, strlen(value+1)+1);
        }
      }
      else //nothing to parse or done
      {
        #ifdef DEBUG_WEBS
        Serial.println("Nothing to parse or done");
        #endif
        return false;
      }

      return true;
    }

    boolean httpPostParamParser(T* client)
    {
      if(client->_httpRequestData.postParamsDataPointer == NULL)
      {
          client->_httpRequestData.postParamsDataPointer = (char *)client->_data + 1;//We save the starting position of the string to parse and we ignore the \n
      }
      
      char *key = strchr(client->_httpRequestData.postParamsDataPointer, '=');
      char *value = strchr(client->_httpRequestData.postParamsDataPointer, '&');

      if(key == NULL && value == NULL) //Nothing to parse or done
      {
        return false;
      }
      else if(key != NULL && value == NULL) //Only one key is present
      {
        *key = '\0';
        client->_httpRequestData.postParams.add(client->_httpRequestData.postParamsDataPointer, new DictionaryHelper::StringEntity(key+1));
        return false;
      }
      else if(key != NULL && value != NULL)
      {
        *key = '\0';
        *value = '\0';
        client->_httpRequestData.postParams.add(client->_httpRequestData.postParamsDataPointer, new DictionaryHelper::StringEntity(key+1));
        memmove(client->_httpRequestData.postParamsDataPointer, value +1, strlen(value+1) + 1);
      }
      else if(key == NULL && value != NULL)//Should never happen
        return false;
        
      return true;
    }

    void sendDataToClient(T *client)
    {
      if(!sendPageToClientFromApiDictio(client)) //Then we check if it is not a file that is requested 
      {
        if(!sendPageToClientFromSdCard(client)) //If this function returns false, we close the connection with the client. An error occured (An error message has already been sent) or the whole file has been sent.
        {
          client->_WEBClientState = WEBClientState::RESPONSE_SENT;
        }
      }
      else //If we found the api endpoint, we can close the connection with the client after the data has been sent.
        client->_WEBClientState = WEBClientState::RESPONSE_SENT;
    }

    boolean sendPageToClientFromApiDictio(T *client)
    {
      if(_apiDictionary.count() == 0 || client->_httpRequestData.httpResource == NULL)
        return false;
        
      ApiRoutine *ref = _apiDictionary(client->_httpRequestData.httpResource);
      
      if(ref == NULL)
        return false;
    
      if(ref->HRM == UNDEFINED)
      {
        return (*(ref->apiRoutine))(client->_httpRequestData, &(client->_client), ref->pData);
      }else if(ref->HRM == client->_httpRequestData.HRM)
      {
        return (*(ref->apiRoutine))(client->_httpRequestData, &(client->_client), ref->pData);
      }
      else
        return false;
    }

    boolean sendPageToClientFromSdCard(T *client)
    {
      if(_sdCardManager != NULL)
      {
        File pageToSend;
        char *filePath(NULL), *header(NULL);
        uint8_t sendBuffer[READ_WRITE_BUFFER_SIZE];
        int readBytes(0);
        //We check what kind of http verb it is
        switch(client->_httpRequestData.HRM)
        {
          case GET:
            filePath = getFilePathByHttpResource(client->_httpRequestData.httpResource);
            if(filePath == NULL)
            {
              sendInfoResponse(HTTP_CODE::HTTP_CODE_INTERNAL_SERVER_ERROR, client, "Failed to allocate memory for the filePath");
              return false;
            }
            
            #ifdef DEBUG_WEBS
            Serial.print("FILE PATH : ");
            Serial.println(filePath);
            #endif
            
            pageToSend = _sdCardManager->open(filePath);
            free(filePath);filePath = NULL;

            //If we couldn't open the file
            if(!pageToSend)
            {
              char *response(NULL);
              
              response = (char *) malloc(sizeof(char) * (strlen_P((PGM_P)F("Resource :  not found on this server")) + strlen(client->_httpRequestData.httpResource) + 1));
              if(response == NULL)
              {
                sendInfoResponse(HTTP_CODE::HTTP_CODE_INTERNAL_SERVER_ERROR, client, "Failed to allocate memory for the response");
                return false;
              }
              
              sprintf(response, "Resource : %s not found on this server", client->_httpRequestData.httpResource);
              sendInfoResponse(HTTP_CODE::HTTP_CODE_NOT_FOUND, client, response);
              
              free(response);response = NULL;
              return false;
            }
    
            #ifdef DEBUG_WEBS
            Serial.print("FILE SIZE : ");
            Serial.println(pageToSend.size());
            Serial.print("FILE NAME : ");
            Serial.println(pageToSend.name());
            #endif

            if(pageToSend.isDirectory()) //To DO : List the files present in the directory
            {
              pageToSend.close();
              
              sendInfoResponse(HTTP_CODE::HTTP_CODE_FORBIDDEN, client, "The file you want to access is a folder");
              return false;
            }

            if(client->_fileSentBytes == 0 /*&& client->_range == 0*/)
            {
              char *fileName = (char *) malloc(sizeof(char) * strlen(pageToSend.name()) + 1); 
              
              if(fileName != NULL)strcpy(fileName, pageToSend.name());
              header = getHTTPHeader(getMIMETypeByExtension(strlwr(getFileExtension(fileName))), pageToSend.size());
              
              #ifdef DEBUG_WEBS
              Serial.print("FILE EXTENSION : ");
              Serial.println(getFileExtension(fileName));
              #endif
              
              free(fileName);
              
              if(header == NULL)
              {
                sendInfoResponse(HTTP_CODE::HTTP_CODE_INTERNAL_SERVER_ERROR, client, "Failed to allocate memory for the header");
                pageToSend.close();
                return false;
              }
              
              client->_client.print(header);
              free(header);header = NULL;
            }
            /*else if(client->_fileSentBytes == 0 && (!client->_range == 0))
            {
              client->_fileSentBytes = client->_range-500;
              Serial.println("RANGE SET");
            }*/
            else
            {
              pageToSend.seek(client->_fileSentBytes);
            }
            
            if(pageToSend.available())
            {
              readBytes = pageToSend.read(sendBuffer,READ_WRITE_BUFFER_SIZE);
              client->_client.write(sendBuffer, readBytes);
              
              #ifdef DEBUG_WEBS
              Serial.print("BYTES SENT : ");
              Serial.println(readBytes);
              #endif
              
              client->_fileSentBytes += readBytes; //We save the number of bytes sent so that we can reopen the file to this position later on.
            }
            else 
            {
              pageToSend.close();
              return false;
            }
            
            pageToSend.close();
            break;
          default: //If not supported
            sendInfoResponse(HTTP_CODE::HTTP_CODE_METHOD_NOT_ALLOWED, client, "The method used is not allowed");
            return false;
            break;
        }
      }
      else
      {
        sendInfoResponse(HTTP_CODE::HTTP_CODE_INTERNAL_SERVER_ERROR, client, "Api endpoint does not exist");
        return false;
      }
      
      return true;
    }

    /*Static helper methods*/
    
    static void sendInfoResponse(HTTP_CODE http_code, T *client, const char *message)
    {
      char codeLiteral[100];
      switch(http_code)
      {
        case HTTP_CODE_BAD_REQUEST:
          strcpy_P(codeLiteral,PSTR("Bad Request"));
          break;
        case HTTP_CODE_NOT_FOUND:
          strcpy_P(codeLiteral,PSTR("Not Found"));
          break;
        case HTTP_CODE_FORBIDDEN:
          strcpy_P(codeLiteral,PSTR("Forbidden"));
          break;
        case HTTP_CODE_METHOD_NOT_ALLOWED:
          strcpy_P(codeLiteral,PSTR("Method Not Allowed"));
          break;
        case HTTP_CODE_INTERNAL_SERVER_ERROR:
          strcpy_P(codeLiteral,PSTR("Internal Server Error"));
          break;
        default:
          strcpy_P(codeLiteral,PSTR("Error Not Defined"));
          break;
      }
      client->_client.printf_P(PSTR("HTTP/1.1 %d %s\r\nContent-Type: text/html\r\nContent-Length: %d\r\n\r\n<!DOCTYPE HTML>\r\n<html>\r\n<h1>Error %d</h1><p>%s</p>\r\n</html>"), http_code, codeLiteral, strlen(message) + 56 + (http_code != 0 ? 3:1), http_code , message);
    }
    
		static HttpRequestMethod getHttpVerbEnumValue(const char *parseBuffer)
    {
      if(parseBuffer == NULL)return HttpRequestMethod::UNDEFINED;
      
      //UNDEFINED, GET, HEAD, POST, PUT, DELETE, CONNECT, OPTIONS, TRACE, PATCH
      if(strcmp(parseBuffer,"GET") == 0){return HttpRequestMethod::GET;}
      else if(strcmp(parseBuffer,"POST") == 0){return HttpRequestMethod::POST;}
      else if(strcmp(parseBuffer,"HEAD") == 0){return HttpRequestMethod::HEAD;}
      else if(strcmp(parseBuffer,"PUT") == 0){return HttpRequestMethod::PUT;}
      else if(strcmp(parseBuffer,"DELETE") == 0){return HttpRequestMethod::DELETE;}
      else if(strcmp(parseBuffer,"CONNECT") == 0){return HttpRequestMethod::CONNECT;}
      else if(strcmp(parseBuffer,"TRACE") == 0){return HttpRequestMethod::TRACE;}
      else if(strcmp(parseBuffer,"PATCH") == 0){return HttpRequestMethod::PATCH;}
      else if(strcmp(parseBuffer,"OPTIONS") == 0){return HttpRequestMethod::OPTIONS;}
      else
        return HttpRequestMethod::UNDEFINED;
    }

    static HttpMIMEType getMIMETypeByExtension(const char *extension)
    {
      if(extension == NULL)return UNKNOWN_MIME;
      
      //TEXT_PLAIN, TEXT_CSS, TEXT_HTML, TEXT_JAVASCRIPT
      if(strcmp(extension,"web") == 0) return TEXT_HTML;
      else if(strcmp(extension,"htm") == 0) return TEXT_HTML;
      else if(strcmp(extension,"css") == 0) return TEXT_CSS;
      else if(strcmp(extension,"js") == 0) return TEXT_JAVASCRIPT;
      else if(strcmp(extension,"png") == 0) return IMAGE_PNG;
      else if(strcmp(extension,"jpg") == 0) return IMAGE_JPEG;
      else if(strcmp(extension, "mp3") == 0) return AUDIO_MPEG;
      else return UNKNOWN_MIME;
    }
    
    static char *getHTTPHeader(HttpMIMEType httpMIMEType, size_t size)
    {
      char *header = (char *) malloc(sizeof(char) /*strlen("HTTP/1.1 200 OK\r\nContent-Type: \r\nContent-Length: \r\nCache-Control: max-age=31536000\r\n\r\n")*/* (86 + 255/*Longest MIME-TYPE that RFC allows*/ + 10 /*Max unsigned long footprint*/ + 1));
    
      switch(httpMIMEType)
      {
        case TEXT_HTML:
          injectHeaderLayout(header,"text/html", size);
          break;
        case TEXT_CSS:
          injectHeaderLayout(header,"text/css", size);
          break;
        case TEXT_JAVASCRIPT:
          injectHeaderLayout(header,"text/javascript", size);
          break;
        case IMAGE_PNG:
          injectHeaderLayout(header,"image/png", size);
          break;
        case IMAGE_JPEG:
          injectHeaderLayout(header,"image/jpeg", size);
          break;
        case TEXT_PLAIN:
          injectHeaderLayout(header,"text/plain", size);
          break;
        case AUDIO_MPEG:
          injectHeaderLayout(header,"audio/mpeg", size);
          break;
        case APPLICATION_OCTET_STREAM:
          injectHeaderLayout(header,"application/octet-stream", size);
          break;
        default:
          injectHeaderLayout(header,"application/octet-stream", size);
          break;
      }
    
      return header;
    }

    static void injectHeaderLayout(char *header, const char *contentType, size_t size)
    {
      sprintf(header,"HTTP/1.1 200 OK\r\nContent-Type: %s\r\nContent-Length: %lu\r\nCache-Control: max-age=31536000\r\n\r\n",contentType,size);
    }
    
    static char *getFileExtension(char *name)
    {
      char *p(lastIndexOf(name, '.'));
      
      return p != NULL ? p+1 : NULL;
    }
    
    static char *getFilePathByHttpResource(char *res)
    {
      uint16_t buffSize = strlen(WWW_DIR)  + (strcmp(res, "/") == 0 ? 10:strlen(res)) + 1;//10 for /index.htm +1 for \0
      char *filePath = (char*) malloc( sizeof(char) * buffSize); 
      
      if(filePath == NULL)
        return NULL;
    
      strcpy(filePath, WWW_DIR);
      strcat(filePath, strcmp(res, "/") == 0 ? "/index.htm":res);
    
      #ifdef DEBUG_FILEPATH
      Serial.println(res);
      Serial.print("Reserved space : ");Serial.println(buffSize);
      Serial.print("Actual size : ");Serial.println(strlen(filePath));
      Serial.println(filePath);
      #endif
      
      return filePath;
    }
    
  	static HttpVersion getHttpVersionEnumValue(const char *parseBuffer)
    {
       //HTTP_0_9, HTTP_1_1, HTTP_1_0, HTTP_2_0
       if(strcmp(parseBuffer,"1.1") == 0){return HttpVersion::HTTP_1_1;}
       else if(strcmp(parseBuffer,"2.0") == 0){return HttpVersion::HTTP_2_0;}
       else if(strcmp(parseBuffer,"1.0") == 0){return HttpVersion::HTTP_1_0;}
       else if(strcmp(parseBuffer,"0.9") == 0){return HttpVersion::HTTP_0_9;}
       else
         return HttpVersion::UNKNOWN;
    }
   
    struct ApiRoutine
    {
      boolean (*apiRoutine)(HttpRequestData&, WiFiClient*, void*);
      void *pData;
      HttpRequestMethod HRM;
    };
    
    Dictionary<ApiRoutine> _apiDictionary;
    SDCardManager *_sdCardManager;
};

#endif //WEBSERVER_H