#include "datalink.h" 
#include <WiFi.h>
#include <WiFiClient.h>
#include <SPI.h>
#include <SD.h>
#include <time.h> 
#include "ESP32FtpServer.h"

File root;

FtpServer ftpSrv;

#define SD_CS   A1
#define SDSPEED 40000000

void printDirectory(File dir, int numTabs) {

	// Begin at the start of the directory
	dir.rewindDirectory();

	while(true) {
		File entry =  dir.openNextFile();
		if (! entry) break; // no more files
		for (uint8_t i=0; i<numTabs; i++) {
			Serial1.print('\t');   // we'll have a nice indentation
		}
		Serial1.print(entry.name());

		time_t t= entry.getLastWrite();
		struct tm * tmstruct = localtime(&t);

		// Recurse for directories, otherwise print the file size
		if (entry.isDirectory()) {
			Serial1.printf("/\t%d-%02d-%02d %02d:%02d:%02d\n",(tmstruct->tm_year)+1900,( tmstruct->tm_mon)+1, tmstruct->tm_mday,tmstruct->tm_hour , tmstruct->tm_min, tmstruct->tm_sec);
			printDirectory(entry, numTabs+1);
		} else {
			Serial1.printf("\t%d-%02d-%02d %02d:%02d:%02d\t",(tmstruct->tm_year)+1900,( tmstruct->tm_mon)+1, tmstruct->tm_mday,tmstruct->tm_hour , tmstruct->tm_min, tmstruct->tm_sec);
			// files have sizes, directories do not
			Serial1.println(entry.size(), DEC);
		}
		entry.close();
	}
}

void printWifiStatus() {

	// print the SSID of the network you're attached to:
	Serial1.print("SSID: ");
	Serial1.println(WiFi.SSID());

	// print your board's IP address:
	IPAddress ip = WiFi.localIP();
	Serial1.print("IP Address: ");
	Serial1.println(ip);

	// print the received signal strength:
	long rssi = WiFi.RSSI();
	Serial1.print("signal strength (RSSI):");
	Serial1.print(rssi);
	Serial1.println(" dBm");
	Serial1.println("");
}

void setup(void){

	Serial1.begin(115200);

	if (!WiFi.config(LOCAL_IP, GATEWAY, SUBNETMASK, PRIMARY_DNS)) {
		Serial.println("STA Failed to configure");
	}
	WiFi.begin(SECRET_SSID, SECRET_PASS); // Connect to WPA/WPA2 network
	while (WiFi.status() != WL_CONNECTED) {
		Serial1.print(".");
		delay(500);
	}
	Serial1.println("");

	printWifiStatus();

	if (SD.begin( SD_CS, SPI, SDSPEED)) {
		ftpSrv.begin(FTP_UNAME,FTP_PASS);  // set ports in ESP32FtpServer.h  (default 21, 50009 for PASV)
		root = SD.open("/");
		printDirectory(root, 0);
	}
}

void loop(void){
	ftpSrv.handleFTP();        //make sure in loop you call handleFTP()!!   
}