#include <Arduino.h>
//#include <Wire.h>
#include <SSD1306Wire.h> //使用ESP8266 and ESP32 OLED driver for SSD1306 displays的library
//#include <U8g2lib.h>
//#include <Adafruit_GFX.h>
//#include <Adafruit_SSD1306.h>  //使用Adafruit SSD1306的library

//印qrcode需要三個函數庫：QRcodeDisplay,QRcodeOled,ESP8266 and ESP32 OLED driver for SSD1306 displays
#include <qrcodeoled.h> 
#include <Adafruit_Keypad.h> 

//#define OLEDDISPLAY
#define SDA 5
#define SCL 4


//U8G2_SSD1306_128X64_NONAME_F_4W_SW_SPI u8g2(U8G2_R0, 4,5,U8X8_PIN_NONE);
//Adafruit_SSD1306 display(0x3c, SDA, SCL);  
SSD1306Wire display(0x3c, SDA, SCL);   // OLED顯示(address, SDA, SCL)
QRcodeOled qrcode (&display);

int queue_number = 1;     //排隊編號
String  text = "";        //qrcode內容
String key = "";          //當下的按鍵
String last_key = "";     //總共按鍵
int last_key_int = 0;     //轉換用
int wait_time = 50000  ;  //(ms) = 50s //目前沒用到
int mode = 1 ; // mode1: gernerate QR code, mode2: start advertising
int adv_number = 1;       //目前要廣播的號碼，好像可以不用，目前沒用到
int record_adv = 1;       //上一個廣播號碼

//keypad
const byte rows = 4; // 列數(橫的)
const byte cols = 4; // 行數(直的)

char keys[rows][cols] = {
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};

byte rowPins[rows] = {6, 7, 8, 3}; //定義列的腳位
byte colPins[cols] = {10, 11, 12, 13}; //定義行的腳位


//初始化鍵盤
Adafruit_Keypad customKeypad = Adafruit_Keypad( makeKeymap(keys), rowPins, colPins, rows,cols);

bool display_QRcode_on_oled(int queue_num,int service_num,int broadcast_num);
String number_to_service(int num) ;

void setup() {
  Serial.begin(115200);
  //initializaation
  display.init(); 
  qrcode.init();
  customKeypad.begin();
  
  // 啟動時間
  //setTime(0, 0, 0, 10, 15, 2023); // 設置時間1
  Serial.println("Start!");
  
}
 
void loop() {
  
  //display.clear();    //清除OLED
  //display.drawString(0,0, "Counter");
  //display.display();  //顯示在OLED上

 /* time_t t = now(); // 獲取當前時間1
  String time_test = String(year(t))+","+month(t)+","+day(t)+","+hour(t)+","+minute(t)+","+second(t);
  */


  // 開始偵測使用者的按鍵狀態
  customKeypad.tick();

  //判斷按了哪一個鍵
  if(customKeypad.available()){
    keypadEvent e = customKeypad.read(); //按下放開按鍵都會被讀取，所以按一次會被讀取到兩次

    //確定偵測到按下的訊號:按下的狀態是KEY_JUST_PRESSED,放開的狀態是KEY_JUST_RELEASED
    if(e.bit.EVENT == KEY_JUST_PRESSED) { 
      Serial.print((char)e.bit.KEY);
      Serial.println(" pressed"); 
      key = (char)e.bit.KEY;
      if (key=="*"){    //reset all param.
        display.clear(); 
        display.drawString(50,25, "Clear");
        display.display();  
        key = ""; last_key="";
        Serial.println(" clear"); 
      } 
      else if (key=="#"){   
        if (mode == 1){   //generate QR code mode
          last_key_int = last_key.toInt();
          if (!display_QRcode_on_oled(queue_number,last_key_int,record_adv)){
            //re-enter
            if (queue_number==255)  queue_number = 1;
            else   queue_number = queue_number + 1;   
            Serial.println("re-enter");
          }
          else  Serial.println("display qrcode");   //已經有qrcode出現
          key = "";last_key="";
        }
        else{             //adv. mode
          Serial.println("adv."); 
        }
      } 
      else if (key=="A"){// mode1
        mode = 1;
        display.clear();
        display.drawString(18,25,"Generate QR code!");
        display.display();
        key = "";last_key="";
      }
      else if (key=="B"){// mode2
        mode = 2;
        display.clear();
        display.drawString(40,25,"Start adv!");
        display.display();
        key = "";last_key="";
      }
      else if (key=="C" || key=="D"){  //C,D鍵 目前沒用到
        display.clear();
        display.drawString(40,25,"No function!");
        display.display();
      }
      else{ //數字鍵
        if (last_key == "") last_key = key;
        else   last_key += key;
        display.clear();
        display.drawString(60,25,last_key);
        display.display();
      }
    }

  }

  delay(100);//delay(1000)=delay一秒
}


//display the QR code on the oled
bool display_QRcode_on_oled(int queue_num,int service_num,int broadcast_num){
    String service = number_to_service(service_num);

    display.clear();    //清除OLED
    if (service == "None"){    
    /*display.drawString(0,13, "Please enter the");
    display.drawString(15,28, "service code");
    display.drawString(43,43, "again");*/
      display.drawString(5,15, "Please  enter  the  service");
      display.drawString(35,40, "code  again");
      display.display();  //顯示在OLED上
      return 0;
    }
    else{
      text = "nthu_com," + String(queue_num) + "," + service + "," + String(broadcast_num);
      qrcode.create(text);
      return 1;
    } 
}

//get the corresponding service
String number_to_service(int num){
    String services[] = {
        "蜜汁烤雞腿飯", //1
        "玫瑰油雞腿飯", //2
        "現炸大雞腿飯", //3
        "脆皮烤鴨飯",   //4
        "脆皮燒肉飯",   //5
        "蜜汁叉燒飯",   //6
        "現炸香雞排飯", //7
        "現炸排骨飯",   //8
        "叉燒、油雞飯", //9
        "叉燒、烤鴨飯", //10
        "烤雞飯",      //11
        "香腸飯",      //12
        "油雞飯",      //13
        "麻辣雞飯",    //14
        //"蒜泥白肉飯"   //15
    };
    int max_num = sizeof(services) / sizeof(services[0]);

    if (num >= 1 && num <= max_num) {
        return services[num - 1];
    } else {
        return "None";
    }
}