#include "influxdb.h"


InfluxDB::InfluxDB(std::string url, bool verbose){

  curl = curl_easy_init();  
  if( verbose) curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
  this->databaseIP  = url;
  respondCode = 0;
  dataPoints = "";
}

InfluxDB::~InfluxDB(){
  
  curl_easy_cleanup(curl);
}


std::string InfluxDB::ShowDatabases(){
  curl_easy_setopt(curl, CURLOPT_POST, 1);
  
  curl_easy_setopt(curl, CURLOPT_URL, (databaseIP   + "/query").c_str());
  
  std::string postFields="q=Show databases";
  curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, static_cast<long>(postFields.length()));
  curl_easy_setopt(curl, CURLOPT_POSTFIELDS, postFields.c_str());
  
  curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteCallBack);
  std::string readBuffer;
  curl_easy_setopt(curl, CURLOPT_WRITEDATA, &readBuffer);
  
  Execute();
  
  printf("|%s|\n", readBuffer.c_str());
  
  return readBuffer;
}

std::string InfluxDB::Query(std::string databaseName, std::string query){
  
  curl_easy_setopt(curl, CURLOPT_POST, 1);

  curl_easy_setopt(curl, CURLOPT_URL, (databaseIP   + "/query?db=" + databaseName).c_str());

  std::string postFields = "q=" + query;
  curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, static_cast<long>(postFields.length()));
  curl_easy_setopt(curl, CURLOPT_POSTFIELDS, postFields.c_str());

  curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteCallBack);
  std::string readBuffer;
  curl_easy_setopt(curl, CURLOPT_WRITEDATA, &readBuffer);
  
  Execute();
  
  printf("|%s|\n", readBuffer.c_str());
  
  return readBuffer;
}

void InfluxDB::CreateDatabase(std::string databaseName){
  curl_easy_setopt(curl, CURLOPT_URL, (databaseIP + "/query").c_str());
  curl_easy_setopt(curl, CURLOPT_POST, 1);
  
  std::string postFields = "q=CREATE DATABASE " + databaseName;
  curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, static_cast<long>(postFields.length()));
  curl_easy_setopt(curl, CURLOPT_POSTFIELDS, postFields.c_str());
  
  Execute();
}

void InfluxDB::AddDataPoint(std::string fullString){
  dataPoints += fullString + "\n";
}

void InfluxDB::ClearDataPoints(){
  dataPoints = "";
}

void InfluxDB::PrintDataPoints(){
  printf("%s\n", dataPoints.c_str());
}

void InfluxDB::WriteData(std::string databaseName){
  curl_easy_setopt(curl, CURLOPT_URL, (databaseIP + "write?db=" + databaseName).c_str());
  curl_easy_setopt(curl, CURLOPT_POST, 1);
  curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, static_cast<long>(dataPoints.length()));
  curl_easy_setopt(curl, CURLOPT_POSTFIELDS, dataPoints.c_str());
  Execute();
}


void InfluxDB::Execute(){
  respond = curl_easy_perform(curl);
  curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &respondCode);
  printf("==== respond code %ld \n", respondCode);
  if( respond != CURLE_OK) printf("############# fail\n");
}

size_t InfluxDB::WriteCallBack(char *contents, size_t size, size_t nmemb, void *userp){
    ((std::string*)userp)->append((char*)contents, size * nmemb);
    return size * nmemb;
}