// benoetigte Lib:
// * "AsyncTCP" by dvarell
// * "ESPAsyncWebServer" by lacamera

#include <Arduino.h>

//Server 
#include <WiFi.h>
#include <WiFiClient.h>
#include <AsyncTCP.h>           
#include <ESPAsyncWebServer.h>  
#include "index.h"  //Web page header file

// SD
#include "FS.h"
#include "SD.h"
#include "SPI.h"
#define PIN_CS  5


const int baudrate = 115200;
const char* ssid = "ESPServ";
const char* password = "ESPtest";

AsyncWebServer server(80);  

IPAddress local_ip(192, 168, 1, 1);
IPAddress gateway(192, 168, 1, 1);
IPAddress subnet(255, 255, 255, 0);

void SD_Init(void)
{
  if(!SD.begin(PIN_CS)){
    Serial.println("Card Mount Failed");
    return;
  }
  uint8_t cardType = SD.cardType();

  if(cardType == CARD_NONE){
    Serial.println("No SD card attached");
    return;
  }

  Serial.println("SD iO");
}


void readFile(fs::FS &fs, const char * path){
  File file = fs.open(path);
  if(!file){
    Serial.println("SD Read failed!");
    return;
  }

  Serial.printf("SD Read, File= %s:\n", path);
  while(file.available()){
    Serial.write(file.read());
  }
  file.close();
}



//===============================================================
// Setup
//===============================================================

void setup(void)
{
  Serial.begin(baudrate);
  SD_Init();

  WiFi.mode(WIFI_AP); //Access Point mode
  WiFi.softAPConfig(local_ip, gateway, subnet);
  WiFi.softAP(ssid, password); 
  Serial.print("Network is: ");
  Serial.println(ssid);
  Serial.print("IP address set: ");
  Serial.println(local_ip);  //IP address assigned to your ESP


  // Website init    
  server.on("/", HTTP_GET, [](AsyncWebServerRequest *request)
    {
      request->send_P(200, "text/html", MAIN_page);
    }
  );

  // Download
  server.on("/BtnDwnld", HTTP_GET, [](AsyncWebServerRequest *request)
  {
    
    Serial.println("Bt download pressed"); 

    File file = SD.open("Log1.csv", "r");
    if (file)
    {
      request->send(file, file.name(), "application/octet-stream", true);
      file.close();
    }       

    readFile(SD, "/Log1.csv");
  });

  server.begin(); 
  Serial.println("Server gestartet!");
  delay(1000);
}

void loop(void)
{
  // nichts
  Serial.print(".");  // alive
  delay(1000);
}