/**
 * Created by K. Suwatchai (Mobizt)
 *
 * Email: suwatchai@outlook.com
 *
 * Github: https://github.com/mobizt/ESP-Mail-Client
 *
 * Copyright (c) 2023 mobizt
*/

// This example shows how to assign the custom ports with protocols to access IMAP server.

/** Note for library update from v2.x.x to v3.x.x.
 * 
 *  Struct data names changed
 *
 * "ESP_Mail_Session" changes to "Session_Config"
 * "IMAP_Config" changes to "IMAP_Data"
 *
 * Changes in the examples
 *
 * ESP_Mail_Session session;
 * to
 * Session_Config config;
 *
 * IMAP_Config config;
 * to
 * IMAP_Data imap_data;
 */

/** For ESP8266, with BearSSL WiFi Client
 * The memory reserved for completed valid SSL response from IMAP is 16 kbytes which
 * may cause your device out of memory reset in case the memory
 * allocation error.
 */

#include <Arduino.h>
#if defined(ESP32) || defined(ARDUINO_RASPBERRY_PI_PICO_W)
#include <WiFi.h>
#elif defined(ESP8266)
#include <ESP8266WiFi.h>
#elif __has_include(<WiFiNINA.h>)
#include <WiFiNINA.h>
#elif __has_include(<WiFi101.h>)
#include <WiFi101.h>
#elif __has_include(<WiFiS3.h>)
#include <WiFiS3.h>
#endif

#include <ESP_Mail_Client.h>

#define WIFI_SSID "<ssid>"
#define WIFI_PASSWORD "<password>"

/** For Gmail, IMAP option should be enabled. https://support.google.com/mail/answer/7126229?hl=en
 * and also https://accounts.google.com/b/0/DisplayUnlockCaptcha
 *
 * Some Gmail user still not able to sign in using account password even above options were set up,
 * for this case, use "App Password" to sign in instead.
 * About Gmail "App Password", go to https://support.google.com/accounts/answer/185833?hl=en
 *
 * For Yahoo mail, log in to your yahoo mail in web browser and generate app password by go to
 * https://login.yahoo.com/account/security/app-passwords/add/confirm?src=noSrc
 *
 * To use Gmai and Yahoo's App Password to sign in, define the AUTHOR_PASSWORD with your App Password
 * and AUTHOR_EMAIL with your account email.
 */

/* The imap host name e.g. imap.gmail.com for GMail or outlook.office365.com for Outlook */
#define IMAP_HOST "<host>"

/** The imap port e.g.
 * 143  or esp_mail_imap_port_143 // Plain or TLS with STARTTLS
 * 993 or esp_mail_imap_port_993
 */
#define IMAP_PORT esp_mail_imap_port_143

/* The log in credentials */
#define AUTHOR_EMAIL "<email>"
#define AUTHOR_PASSWORD "<password>"

/* Print the list of mailbox folders */
void printAllMailboxesInfo(IMAPSession &imap);

/* Print the selected folder info */
void printSelectedMailboxInfo(SelectedFolderInfo sFolder);

/* Declare the global used IMAPSession object for IMAP transport */
IMAPSession imap;

#if defined(ARDUINO_RASPBERRY_PI_PICO_W)
WiFiMulti multi;
#endif

void setup()
{

    Serial.begin(115200);

#if defined(ARDUINO_ARCH_SAMD)
    while (!Serial)
        ;
#endif

    Serial.println();

#if defined(ARDUINO_RASPBERRY_PI_PICO_W)
    multi.addAP(WIFI_SSID, WIFI_PASSWORD);
    multi.run();
#else
    WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
#endif

    Serial.print("Connecting to Wi-Fi");
        
#if defined(ARDUINO_RASPBERRY_PI_PICO_W)
    unsigned long ms = millis();
#endif

    while (WiFi.status() != WL_CONNECTED)
    {
        Serial.print(".");
        delay(300);
#if defined(ARDUINO_RASPBERRY_PI_PICO_W)
        if (millis() - ms > 10000)
            break;
#endif
    }
    Serial.println();
    Serial.print("Connected with IP: ");
    Serial.println(WiFi.localIP());
    Serial.println();

    /*  Set the network reconnection option */
    MailClient.networkReconnect(true);

    // The WiFi credentials are required for Pico W
    // due to it does not have reconnect feature.
#if defined(ARDUINO_RASPBERRY_PI_PICO_W)
    MailClient.clearAP();
    MailClient.addAP(WIFI_SSID, WIFI_PASSWORD);
#endif

    /** Enable the debug via Serial port
     * 0 for no debugging
     * 1 for basic level debugging
     *
     * Debug port can be changed via ESP_MAIL_DEFAULT_DEBUG_PORT in ESP_Mail_FS.h
     */
    imap.debug(1);

    /* Declare the Session_Config for user defined session credentials */
    Session_Config config;

    /** In case the SD card/adapter was used for the file storagge, the SPI pins can be configure from
     * MailClient.sdBegin function which may be different for ESP32 and ESP8266
     * For ESP32, assign all of SPI pins
     * MailClient.sdBegin(14,2,15,13)
     * Which SCK = 14, MISO = 2, MOSI = 15 and SS = 13
     * And for ESP8266, assign the CS pins of SPI port
     * MailClient.sdBegin(15)
     * Which pin 15 is the CS pin of SD card adapter
     */

    /* Set the session config */
    config.server.host_name = IMAP_HOST;
    config.server.port = IMAP_PORT;
    config.login.email = AUTHOR_EMAIL;
    config.login.password = AUTHOR_PASSWORD;

    /** Set the ports and protocols
     *  The port that assigned with config.server.port will map with the
     *  protocol assigned here
     */

    config.ports_functions.list = new port_function[2];
    config.ports_functions.size = 2;

    config.ports_functions.list[0].port = 143;
    config.ports_functions.list[0].protocol = esp_mail_protocol_tls;

    config.ports_functions.list[1].port = 993;
    config.ports_functions.list[1].protocol = esp_mail_protocol_ssl;

    /* Define the IMAP_Data object used for user defined IMAP operating options. */
    IMAP_Data imap_data;

    /* Connect to the server */
    if (!imap.connect(&config, &imap_data))
        return;

    if (imap.isAuthenticated())
        Serial.println("\nSuccessfully logged in.");
    else
        Serial.println("\nConnected with no Auth.");

    /*  {Optional} */
    printAllMailboxesInfo(imap);

    /* Open or select the mailbox folder to read or search the message */
    if (!imap.selectFolder(F("INBOX")))
        return;

    /*  {Optional} */
    printSelectedMailboxInfo(imap.selectedFolder());

    /* Close the seeion in case the session is still open */
    imap.closeSession();

    /* Clear all stored data in IMAPSession object */
    imap.empty();
}

void loop()
{
}

void printAllMailboxesInfo(IMAPSession &imap)
{
    /* Declare the folder collection class to get the list of mailbox folders */
    FoldersCollection folders;

    /* Get the mailbox folders */
    if (imap.getFolders(folders))
    {
        for (size_t i = 0; i < folders.size(); i++)
        {
            /* Iterate each folder info using the  folder info item data */
            FolderInfo folderInfo = folders.info(i);
            MailClient.printf("%s%s%s", i == 0 ? "\nAvailable folders: " : ", ", folderInfo.name, i == folders.size() - 1 ? "\n" : "");
        }
    }
}

void printSelectedMailboxInfo(SelectedFolderInfo sFolder)
{
    /* Show the mailbox info */
    MailClient.printf("\nInfo of the selected folder\nTotal Messages: %d\n", sFolder.msgCount());
    MailClient.printf("UID Validity: %d\n", sFolder.uidValidity());
    MailClient.printf("Predicted next UID: %d\n", sFolder.nextUID());
    if (sFolder.unseenIndex() > 0)
        MailClient.printf("First Unseen Message Number: %d\n", sFolder.unseenIndex());
    else
        MailClient.printf("Unseen Messages: No\n");
        
    if (sFolder.modSeqSupported())
        MailClient.printf("Highest Modification Sequence: %llu\n", sFolder.highestModSeq());
    for (size_t i = 0; i < sFolder.flagCount(); i++)
        MailClient.printf("%s%s%s", i == 0 ? "Flags: " : ", ", sFolder.flag(i).c_str(), i == sFolder.flagCount() - 1 ? "\n" : "");

    if (sFolder.flagCount(true))
    {
        for (size_t i = 0; i < sFolder.flagCount(true); i++)
            MailClient.printf("%s%s%s", i == 0 ? "Permanent Flags: " : ", ", sFolder.flag(i, true).c_str(), i == sFolder.flagCount(true) - 1 ? "\n" : "");
    }
}