/*
   RiTCh Lightshow

   Simple Arduino based MP3/DMX player which can be triggered by buttons.

   (c)2024 by H. Wirtz <wirtz@parasitstudio.de>

*/

/*
    TODO:
    -
*/

#include <SoftwareSerial.h>
#include <DFRobotDFPlayerMini.h>
#include "DmxSimple.h"
#include <EEPROM.h>
#include "looper.h"

#define DEBUG 1

#define SENSOR_SCHED 10
#define WORKER_SCHED 100
#define LED_SCHED 50
#define LEVEL_CHECK_SCHED 100
#define DEBUG_SCHED 500

#define BUTTON_LONG_PRESS 1000
#define MIN_TIME_SWITCH_PRESSED 50
#define LED_NORMAL_BRIGHTNESS 180
#define LED_PLAY_BRIGHTNESS 20
#define DMX_MAX_CHANNEL 512
#define MAX_VOL_LEVEL 30
#define MAX_DMX_LEVEL 255
#define MAX_DMX_SPOTS 2

#define MIN_DMX_FADE_TIME 1
#define MAX_DMX_FADE_TIME 5
#define MIN_DMX_HOLD_TIME 3
#define MAX_DMX_HOLD_TIME 15

// Arduino pins
#define POTI1_PIN A1
#define POTI2_PIN A2
#define POTI3_PIN A3
#define POTI4_PIN A4
#define BUTTON1_PIN 4
#define BUTTON2_PIN 5
#define BUTTON3_PIN 6
#define BUTTON4_PIN 7
#define DMX_PIN 8
#define LED_PIN 9
#define MP3_RX_PIN 10
#define MP3_TX_PIN 11
#define BUSY_PIN 12

uint8_t button_state;
uint32_t button_time[4] = { 0, 0, 0, 0 };
uint8_t poti_level[4] = { 0, 0, 0, 0 };
uint8_t brightness = LED_NORMAL_BRIGHTNESS;

typedef struct {
  uint8_t dmx_type = 4;
  uint16_t address = 0;
  uint16_t steps = 0;
  float diff[4] = { 0.0, 0.0, 0.0, 0.0 };
  float values[4] = { 0.0, 0.0, 0.0, 0.0 };
} dmx_spot;

dmx_spot spot[MAX_DMX_SPOTS];

// schedular
looper sched;

// setup audio card
SoftwareSerial mySoftwareSerial(MP3_RX_PIN, MP3_TX_PIN);  // RX, TX
DFRobotDFPlayerMini myDFPlayer;

//--------------------------------------------------------------------------------
// THREADS
//--------------------------------------------------------------------------------
void button_check(void) {
  byte i;

  for (i = 0; i < 4; i++) {
    uint16_t b = button(i);

    if (b > BUTTON_LONG_PRESS && !bitRead(button_state, i)) {
// long press
#ifdef DEBUG
      Serial.print(F("Button["));
      Serial.print(i + 1, DEC);
      Serial.println(F("]: long"));
#endif
      button_time[i] = 0;
      do_button_long(i);
    } else if (b > MIN_TIME_SWITCH_PRESSED && !bitRead(button_state, i)) {
// short press
#ifdef DEBUG
      Serial.print(F("Button["));
      Serial.print(i + 1, DEC);
      Serial.println(F("]: short"));
#endif
      button_time[i] = 0;
      do_button_short(i);
    }
  }
}

void level_check(void) {
  uint8_t i;
  uint8_t poti_lvl;

  for (i = 0; i < 4; i++) {
    poti_lvl = map(analogRead(poti_pin_by_number(i)), 15, 1023, 0, 255);
    if (poti_lvl != poti_level[i]) {
      poti_level[i] = poti_lvl;
#ifdef DEBUG
      Serial.print(F("Poti["));
      Serial.print(i + 1, DEC);
      Serial.print(F("]: "));
      Serial.println(poti_level[i]);
#endif
      do_level(i);
    }
  }
}

void show_led(void) {
  analogWrite(LED_PIN, LED_PLAY_BRIGHTNESS);
}

void worker(void) {
  for (uint8_t s = 0; s < MAX_DMX_SPOTS; s++) {
    uint8_t diff_counter = 0;

    if (spot[s].steps == 0) {
      for (uint8_t i = 0; i < spot[s].dmx_type; i++) {
        if (spot[s].diff[i] != 0.0) {
          diff_counter++;
          spot[s].diff[i] = 0.0;
        }
      }
      if (diff_counter != 0) {
        // start hold timer
        spot[s].steps = random(MIN_DMX_HOLD_TIME, MAX_DMX_HOLD_TIME) * 1000 / WORKER_SCHED;
#ifdef DEBUG
        Serial.print(F("Spot "));
        Serial.print(s, DEC);
        Serial.print(F(" holding for "));
        Serial.print(spot[s].steps * WORKER_SCHED / 1000, DEC);
        Serial.println(F(" seconds"));
#endif
      } else {
        // new random values
        spot[s].steps = random(MIN_DMX_FADE_TIME, MAX_DMX_FADE_TIME) * 1000 / WORKER_SCHED;
        for (uint8_t i = 0; i < spot[s].dmx_type; i++)
          spot[s].diff[i] = (random(0, 255) - spot[s].values[i]) / spot[s].steps;
#ifdef DEBUG
        Serial.print(F("Spot "));
        Serial.print(s, DEC);
        Serial.print(F(" changing color for "));
        Serial.print(spot[s].steps * WORKER_SCHED / 1000, DEC);
        Serial.println(F(" seconds"));
#endif
      }
    } else {
      for (uint8_t i = 0; i < spot[s].dmx_type; i++) {
        spot[s].values[i] += spot[s].diff[i];
        DmxSimple.write(spot[s].address + i, uint8_t(spot[s].values[i] + 0.5));
#ifdef DEBUG
        Serial.print(F("Spot "));
        Serial.print(s, DEC);
        Serial.print(F(" color "));
        Serial.print(i, DEC);
        Serial.print(F(" step "));
        Serial.print(spot[s].steps, DEC);
        Serial.print(F(" diff "));
        Serial.print(spot[s].diff[i], 4);
        Serial.print(F(" value "));
        Serial.println(spot[s].values[i], 4);
#endif
      }
    }
    spot[s].steps--;
  }
}

//--------------------------------------------------------------------------------
// HELPER FUNCTIONS
//--------------------------------------------------------------------------------
void do_level(uint8_t p) {
#ifdef DEBUG
  Serial.print(F("LEVEL "));
  Serial.println(p);
#endif

  DmxSimple.write(1 + p, poti_level[p]);
}

void do_button_long(uint8_t b) {
#ifdef DEBUG
  Serial.print(F("LONG "));
#endif
  Serial.println(b);
}

void do_button_short(uint8_t b) {
#ifdef DEBUG
  Serial.print(F("SHORT "));
#endif
  Serial.println(b);
}

uint32_t button(byte button_nr) {
  byte button = button_pin_by_number(button_nr);

  if (digitalRead(button) == LOW) {
    if (!bitRead(button_state, button_nr)) {
      bitSet(button_state, button_nr);
      button_time[button_nr] = millis();
    } else {
      if (button_time[button_nr] > millis())
        return (0xffff - button_time[button_nr] + millis());  // overflow-protection
      else
        return (millis() - button_time[button_nr]);
    }
  } else {
    if (bitRead(button_state, button_nr)) {
      bitWrite(button_state, button_nr, 0);
      if (button_time[button_nr] > millis())
        return (0xffff - button_time[button_nr] + millis());  // overflow-protection
      else
        return (millis() - button_time[button_nr]);
    }
  }
  return (0);
}

uint8_t button_pin_by_number(byte n) {
  switch (n) {
    case 0:
      return (BUTTON1_PIN);
      break;
    case 1:
      return (BUTTON2_PIN);
      break;
    case 2:
      return (BUTTON3_PIN);
      break;
    case 3:
      return (BUTTON4_PIN);
      break;
  }
  return (0);
}

uint8_t poti_pin_by_number(byte n) {
  switch (n) {
    case 0:
      return (POTI1_PIN);
      break;
    case 1:
      return (POTI2_PIN);
      break;
    case 2:
      return (POTI3_PIN);
      break;
    case 3:
      return (POTI4_PIN);
      break;
  }
  return (0);
}

//--------------------------------------------------------------------------------
// SYSTEM
//--------------------------------------------------------------------------------
void setup() {
#ifdef DEBUG
  Serial.begin(9600);
#endif

#ifdef __AVR_ATmega32U4__
  while (!Serial) {
    ;  // wait for serial port to connect. Needed for Leonardo only
  }
#endif
#ifdef DEBUG
  Serial.println(F("<setup begin>"));
#endif

  mySoftwareSerial.begin(9600);

  // setup poti pins
  pinMode(POTI1_PIN, INPUT_PULLUP);
  pinMode(POTI2_PIN, INPUT_PULLUP);
  pinMode(POTI3_PIN, INPUT_PULLUP);
  pinMode(POTI4_PIN, INPUT_PULLUP);

  // setup button pins
  pinMode(BUTTON1_PIN, INPUT_PULLUP);
  pinMode(BUTTON2_PIN, INPUT_PULLUP);
  pinMode(BUTTON3_PIN, INPUT_PULLUP);
  pinMode(BUTTON4_PIN, INPUT_PULLUP);

  // setup mp3 busy pin
  pinMode(BUSY_PIN, INPUT_PULLUP);

  // setup LED pin
  pinMode(LED_PIN, OUTPUT);

  // setup DMX
  DmxSimple.usePin(DMX_PIN);
  DmxSimple.maxChannel(DMX_MAX_CHANNEL);

  // DMX setup
  spot[0].address = 1;
  spot[1].address = 5;

// setup audio card
#ifdef DEBUG
  Serial.println(F("Initializing DFPlayer ... (May take 3~5 seconds)"));
#endif

  for (uint8_t n = 0; n < 3; n++) {
    if (!myDFPlayer.begin(mySoftwareSerial)) {  //Use softwareSerial to communicate with mp3.
#ifdef DEBUG
      Serial.print(F("Unable use DFPlayer: "));
      Serial.println(n, DEC);
#endif
      for (uint8_t i = 0; i < 3; i++) {
        analogWrite(LED_PIN, LED_PLAY_BRIGHTNESS);
        delay(100);
        analogWrite(LED_PIN, LED_PLAY_BRIGHTNESS);
        delay(100);
      }
    } else {
#ifdef DEBUG
      Serial.println(F("DFPlayer Mini online."));
#endif
      myDFPlayer.setTimeOut(500);  //Set serial communictaion time out 500ms
      break;
    }
  }

  myDFPlayer.outputDevice(DFPLAYER_DEVICE_SD);

  // init schedular
  sched.addJob(button_check, SENSOR_SCHED);
  sched.addJob(level_check, LEVEL_CHECK_SCHED);
  sched.addJob(worker, WORKER_SCHED);
  sched.addJob(show_led, LED_SCHED);
#ifdef DEBUG
  Serial.println(F("<setup end>"));
#endif
}

void loop() {
  sched.scheduler();
}