#include <Streaming.h>
#include <ranges>

constexpr unsigned milliSec {3};
constexpr bool DEBUG {false};

namespace MeineLed {
  constexpr unsigned frequency {5000};  // Hz
  constexpr unsigned resolution  {10};  // Bit, 0...255 / 0...1023 
  /*
  const unsigned dimLed [] {0,0,0,0,0,0,0,0,
                           1,1,1,2,2,2,3,3,4,5,6,7,8,10,11,13,14,16,18,21,23,25,28,31,34,
                           37,40,43,47,51,55,59,63,67,72,77,82,87,93,98,104,110,116,123,
                           129,136,143,150,158,166,173,182,190,199,207,216,226,235,245,255};
  */                         
  const unsigned dimLed [] {0,0,0,0,0,0,0,0,1,1,1,2,2,3,3,4,5,6,7,8,9,10,11,13,14,16,18,19,21,23,26,28,30,
                            33,35,38,41,44,47,50,54,57,61,64,68,72,77,81,85,90,95,100,105,110,115,121,
                            126,132,138,144,151,157,164,171,177,185,192,199,207,215,223,231,239,248,
                            257,265,274,284,293,303,313,322,333,343,354,364,375,386,398,409,421,433,
                            445,457,470,483,496,509,522,536,549,563,578,592,607,621,636,652,667,683,
                            699,715,731,748,765,782,799,816,834,852,870,889,907,926,945,965,984,1004,1023};            
                                       
  constexpr unsigned dimLedAnzahl { sizeof(dimLed) / sizeof(dimLed[0]) };
  constexpr unsigned maxIndex {dimLedAnzahl-1};
}

// ---------------------------------------------------------------------------------------------------------

void init (const unsigned pin) { 
  using namespace MeineLed;
  ledcAttach(pin, frequency, resolution);
}

constexpr unsigned ledList [] {D2, D3, D4, D5, D6}; // max. 5 Leds

// ---------------------------------------------------------------------------------------------------------

void setup (void)
{
  Serial.begin(115200);
  for (unsigned i=D2; i<D13; i++) { 
    pinMode (i, OUTPUT);
    digitalWrite(i, LOW);
  }
  delay(2000);
  Serial.println("\nESP32 RESET\n");
  for(auto &d : ledList) {
    init(d);
    ledcWrite(d, 0);
    Serial << F("Pin ") << d << F(" ") << ledcReadFreq(d) << F(" Hz") << endl;
  }
}

void loop (void)
{
  for (auto &p : ledList) {
    using namespace MeineLed;
    for (auto &h : dimLed) {
      ledcWrite(p, h);
      if (DEBUG) { Serial << "UP " << h << endl; }
      delay(milliSec);
    }
  }

  std::ranges::reverse_view rLed {ledList};
  for (auto &p : rLed) {
    using namespace MeineLed;
    for (auto &h : dimLed) {
      ledcWrite(p, dimLed[maxIndex]-h);
      if (DEBUG) { Serial << "DN " << h << " " << dimLed[maxIndex]-h << endl; }
      delay(milliSec);
    }
  }
  
}