/*
 * CopyLeft 2022 Pascal Engélibert
 * 
 * This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, version 3 of the License.  
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details.  
You should have received a copy of the GNU Affero General Public License along with this program. If not, see https://www.gnu.org/licenses/.
 */

// Telephone Jukebox
//
// Three types of output may be used, by configuring the code below.
//
//   1: Digital I2S - Normally used with the audio shield:
//         http://www.pjrc.com/store/teensy3_audio.html
//
//   2: Digital S/PDIF - Connect pin 22 to a S/PDIF transmitter
//         https://www.oshpark.com/shared_projects/KcDBKHta
//
//   3: Analog DAC - Connect the DAC pin to an amplified speaker
//         http://www.pjrc.com/teensy/gui/?info=AudioOutputAnalog
//
// To configure the output type, first uncomment one of the three
// output objects.  If not using the audio shield, comment out
// the sgtl5000_1 lines in setup(), so it does not wait forever
// trying to configure the SGTL5000 codec chip.
//
// The SD card may connect to different pins, depending on the
// hardware you are using.  Uncomment or configure the SD card
// pins to match your hardware.
//
// Two pins can be used (one for hang up detection and one for counting), but it also works well with only one pin for both functions.

#include <Audio.h>
#include <Wire.h>
#include <SPI.h>
#include <SD.h>
#include <SerialFlash.h>

//#define PIN_PULSE 4
#define PIN_STOP 2

#define PULSE_DELAY 100

unsigned long pulses_end = 0;
unsigned int pulses = 0;
bool pulse = false;

AudioMixer4              mix2;
AudioMixer4              mix1;
AudioSynthWaveform       waveform1;
AudioPlaySdWav           wav1;
// Use one of these 3 output types: Digital I2S, Digital S/PDIF, or Analog DAC
AudioOutputI2S           phone1;
//AudioOutputSPDIF       phone1;
//AudioOutputAnalog      phone1;
//On Teensy LC, use this for the Teensy Audio Shield:
//AudioOutputI2Sslave    phone1;

AudioConnection c1(waveform1, 0, mix1, 0);
AudioConnection c2(waveform1, 0, mix2, 0);
AudioConnection c3(wav1, 0, mix1, 1);
AudioConnection c4(wav1, 1, mix2, 1);
AudioConnection c5(mix1, 0, phone1, 0);
AudioConnection c6(mix2, 0, phone1, 1);

AudioControlSGTL5000     sgtl5000_1;

// Use these with the Teensy Audio Shield
#define SDCARD_CS_PIN    10
#define SDCARD_MOSI_PIN  7
#define SDCARD_SCK_PIN   14

// Use these with the Teensy 3.5 & 3.6 SD card
//#define SDCARD_CS_PIN    BUILTIN_SDCARD
//#define SDCARD_MOSI_PIN  11  // not actually used
//#define SDCARD_SCK_PIN   13  // not actually used

// Use these for the SD+Wiz820 or other adaptors
//#define SDCARD_CS_PIN    4
//#define SDCARD_MOSI_PIN  11
//#define SDCARD_SCK_PIN   13

void setup() {
  pinMode(PIN_STOP, INPUT_PULLUP);
  //pinMode(PIN_PULSE, INPUT_PULLUP);
  
  AudioMemory(8);

  // Comment these out if not using the audio adaptor board.
  // This may wait forever if the SDA & SCL pins lack
  // pullup resistors
  sgtl5000_1.enable();
  sgtl5000_1.volume(0.5);

  waveform1.begin(WAVEFORM_SINE);
  waveform1.frequency(440);

  SPI.setMOSI(SDCARD_MOSI_PIN);
  SPI.setSCK(SDCARD_SCK_PIN);
  if(!SD.begin(SDCARD_CS_PIN)) {
    // Error: Cannot read SD card
    while(true) {
      if(!digitalRead(PIN_STOP)) {
        waveform1.amplitude(0.5);
        delay(250);
        waveform1.amplitude(0.0);
        delay(1750);
      }
    }
  }
}

void play_track(unsigned int track) {
  char filename[16];
  sprintf(filename, "%d.WAV", track);
  wav1.play(filename);
}

void loop() {
  /*if(digitalRead(PIN_STOP)) {
    waveform1.amplitude(0.0);
    if(wav1.isPlaying()) {
      wav1.stop();
    }
  } else {
    if(wav1.isPlaying()) {
      waveform1.amplitude(0.0);
    } else {
      waveform1.amplitude(0.5);
    }
  }
  
  if(digitalRead(PIN_PULSE)) {
    if(!pulse) {
      pulses ++;
      pulse = true;
    }
  }
  else if(pulse) {
    pulse = false;
    pulses_end = millis() + PULSE_DELAY;
  }
  else if(pulses) {
    if(millis() >= pulses_end) {
      if(!digitalRead(PIN_STOP))
        play_track(pulses);
      pulses = 0;
    }
  }*/

  // If phone is hang up
  if(digitalRead(PIN_STOP)) {
    // Stop tone and music
    waveform1.amplitude(0.0);
    if(wav1.isPlaying()) {
      wav1.stop();
    }

    if(!pulse) {
      pulse = true;
      pulses ++;
      pulses_end = millis() + PULSE_DELAY;
    }
    else if(millis() > pulses_end) {
      pulses = 0;
    }
  } else {
    if(wav1.isPlaying()) {
      // Stop tone
      waveform1.amplitude(0.0);
    } else {
      // Start tone
      waveform1.amplitude(0.5);
    }

    if(pulse) {
      pulse = false;
      pulses_end = millis() + PULSE_DELAY;
    } else if(pulses && millis() > pulses_end) {
      play_track(pulses % 10);
      pulses = 0;
    }
  }
  
  delay(10);
}