#include <Arduino.h>
#include <WiFi.h>
#include <HTTPClient.h>

// URL of file to download over http 
// Change this to the URL of your file.  My test file is was created with:
// dd if=/dev/urandom of=./1MB_file.bin bs=1024 count=1024

// The file to get.
//const char* url      = "https://192.168.1.1/1MB_file.bin";
const char* url      = "https://jwsmythe.com/xfer/esp8266-32-group/1MB_file.bin";
// How many times to get it per loop.
int  num_downloads   = 10;
const char* ssid     = "Wokwi-GUEST";   
const char* password = "";
int start_time       = micros();
int end_time         = micros();
int response_size    = 0; // Holds the size of the current chunk.
int total_elapsed    = 0; // Holds the elapsed time counter for the loop.
int chunk_elapsed    = 0; // Holds the time to download the current chunk.  Don't count non-200 status.
float chunk_speed    = 0.0; // Holds the speed of the current chunk.
float total_speed    = 0.0; // Holds the speed of the total download.
int download_count   = 0; // This is the counter.  Preset to 0.
int total_bytes      = 0; // Holds the total bytes transferred.

void setup() {
  // put your setup code here, to run once:
   Serial.begin(115200);
   Serial.print("+++ Serial Initialized \n");

   // Connect to WiFi 
   Serial.print("+++ Connecting to WiFi \n");
   WiFi.begin(ssid, password);
   while (WiFi.status() != WL_CONNECTED) {
      delay(500);
      Serial.print(".");
   }
   Serial.print("\n+++ WiFi Connected \n");
   Serial.print("... IP Address: ");
   Serial.print(WiFi.localIP());
   Serial.print("\n");
}

void loop() {
   // Download url to file

   HTTPClient http;
   http.begin(url); 
   http.setTimeout(15000);
   download_count = 1;
   total_bytes = 0;
   chunk_elapsed = 0;
   total_elapsed = 0; 
   start_time = 0;
   end_time = 0;

   Serial.print("****************************************\n");
   while(download_count < num_downloads){
      start_time = micros();
         int http_status = http.GET();                                       
         // Check for the returning code
      end_time = micros();
      chunk_elapsed = end_time - start_time;

         if (http_status == 200) { 
            // Our datafile is random garbage.  Don't show it to the user.
            //String payload = http.getString();
            //Serial.println(payload);
            response_size = http.getSize();
            total_bytes   =+ response_size;
            total_elapsed =+ chunk_elapsed;

            chunk_speed = ((response_size*8) / 1000) / (chunk_elapsed /  1000000);
            Serial.print("+++ Block "); Serial.print(download_count); Serial.print(" "); Serial.print(url); Serial.print("\n");
            Serial.print("+++ HTTP status: "); Serial.print(http_status); Serial.print("\n");
            Serial.print("... Block size "); Serial.print(response_size); Serial.print(" bytes\n");
            Serial.print("... Elapsed time "); Serial.print(chunk_elapsed); Serial.print(" microseconds\n");
            Serial.print("... Speed "); Serial.print(chunk_speed); Serial.print(" Kb/s\n");
            download_count++;
         }else if(http_status == 404){
            Serial.print("--- HTTP status: NOT FOUND ("); Serial.print(http_status); Serial.print(")\n");
         }else if(http_status == 304){
            Serial.print("--- HTTP status: NOT redirct ("); Serial.print(http_status); Serial.print(")\n");   
            Serial.print("... Give the final URL of the file.  It may have been redirected.\n");
         }else {
            // Unnecessary noise. Throwing HTTP -7 on every other attempt. Not sure what's causing it.  
            // The web server isn't throwing any errors. 
            Serial.print("--- HTTP status: OTHER ("); Serial.print(http_status); Serial.print(")\n");
         }
         http.end(); //Free the resources
   }; 
   Serial.print("+++ Total bytes downloaded: "); Serial.print(total_bytes); Serial.print(" +++\n");
   Serial.print("+++ Total elapsed time (microseconds) "); Serial.print(total_elapsed); Serial.print(" ...\n");
   total_speed = ((total_bytes/1000)*8) / (total_elapsed /  1000000);   
   Serial.print("+++ Overall Speed: "); Serial.print(total_speed); Serial.print(" Kb/s +++\n");
   delay(1000);
}