/* 
MIT License

Copyright (c) 2019 ERROPiX

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/

#include "analogWrite.h"

analog_write_channel_t _analog_write_channels[16] = {
    {-1, 5000, 13},
    {-1, 5000, 13},
    {-1, 5000, 13},
    {-1, 5000, 13},
    {-1, 5000, 13},
    {-1, 5000, 13},
    {-1, 5000, 13},
    {-1, 5000, 13},
    {-1, 5000, 13},
    {-1, 5000, 13},
    {-1, 5000, 13},
    {-1, 5000, 13},
    {-1, 5000, 13},
    {-1, 5000, 13},
    {-1, 5000, 13},
    {-1, 5000, 13}};

int analogWriteChannel(uint8_t pin)
{
  int channel = -1;

  // Check if pin already attached to a channel
  for (uint8_t i = 0; i < 16; i++)
  {
    if (_analog_write_channels[i].pin == pin)
    {
      channel = i;
      break;
    }
  }

  // If not, attach it to a free channel
  if (channel == -1)
  {
    for (uint8_t i = 0; i < 16; i++)
    {
      if (_analog_write_channels[i].pin == -1)
      {
        _analog_write_channels[i].pin = pin;
        channel = i;
        ledcAttachChannel(channel, _analog_write_channels[i].frequency, _analog_write_channels[i].resolution, channel);
        break;
      }
    }
  }

  return channel;
}

void analogWriteFrequency(double frequency)
{
  for (uint8_t i = 0; i < 16; i++)
  {
    _analog_write_channels[i].frequency = frequency;
  }
}

void analogWriteFrequency(uint8_t pin, double frequency)
{
  int channel = analogWriteChannel(pin);

  // Make sure the pin was attached to a channel, if not do nothing
  if (channel != -1 && channel < 16)
  {
    _analog_write_channels[channel].frequency = frequency;
  }
}

void analogWriteResolution(uint8_t resolution)
{
  for (uint8_t i = 0; i < 16; i++)
  {
    _analog_write_channels[i].resolution = resolution;
  }
}

void analogWriteResolution(uint8_t pin, uint8_t resolution)
{
  int channel = analogWriteChannel(pin);

  // Make sure the pin was attached to a channel, if not do nothing
  if (channel != -1 && channel < 16)
  {
    _analog_write_channels[channel].resolution = resolution;
  }
}

void analogWrite(uint8_t pin, uint32_t value, uint32_t valueMax)
{
  int channel = analogWriteChannel(pin);

  // Make sure the pin was attached to a channel, if not do nothing
  if (channel != -1 && channel < 16)
  {
    uint8_t resolution = _analog_write_channels[channel].resolution;
    uint32_t levels = pow(2, resolution);
    uint32_t duty = ((levels - 1) / valueMax) * min(value, valueMax);

    // write duty to LEDC
    ledcWrite(channel, duty);
  }
}