#ifndef COMMON_GPIO_GPIODEFINITIONS_H_
#define COMMON_GPIO_GPIODEFINITIONS_H_

#include <map>
#include <string>
#include <unordered_map>

#ifdef PLATFORM_WIN
// Defined in Windows header for whatever reason, and leads to nameclash issues with
// class enums which have entries of the same name.
#undef IN
#undef OUT
#undef CALLBACK
#endif

using gpioId_t = uint16_t;

namespace gpio {

enum class Levels : int { LOW = 0, HIGH = 1, NONE = 99 };

enum class Direction : int { IN = 0, OUT = 1 };

enum class GpioOperation { READ, WRITE };

enum class GpioTypes {
  NONE,
  GPIO_REGULAR_BY_CHIP,
  GPIO_REGULAR_BY_LABEL,
  GPIO_REGULAR_BY_LINE_NAME,
  CALLBACK
};

static constexpr gpioId_t NO_GPIO = -1;

using gpio_cb_t = void (*)(gpioId_t gpioId, gpio::GpioOperation gpioOp, gpio::Levels value,
                           void* args);

}  // namespace gpio

/**
 * @brief   Struct containing information about the GPIO to use. This is
 *          required by the libgpiod to access and drive a GPIO.
 * @param chipname      String of the chipname specifying the group which contains the GPIO to
 *                      access. E.g. gpiochip0. To detect names of GPIO groups run gpiodetect on
 *                      the linux command line.
 * @param lineNum       The offset of the GPIO within the GPIO group.
 * @param consumer      Name of the consumer. Simply a description of the GPIO configuration.
 * @param direction     Specifies whether the GPIO should be used as in- or output.
 * @param initValue     Defines the initial state of the GPIO when configured as output.
 *                      Only required for output GPIOs.
 * @param lineHandle    The handle returned by gpiod_chip_get_line will be later written to this
 *                      pointer.
 */
class GpioBase {
 public:
  GpioBase() = default;

  GpioBase(gpio::GpioTypes gpioType, std::string consumer, gpio::Direction direction,
           gpio::Levels initValue)
      : gpioType(gpioType), consumer(consumer), direction(direction), initValue(initValue) {}

  virtual ~GpioBase(){};

  // Can be used to cast GpioBase to a concrete child implementation
  gpio::GpioTypes gpioType = gpio::GpioTypes::NONE;
  std::string consumer;
  gpio::Direction direction = gpio::Direction::IN;
  gpio::Levels initValue = gpio::Levels::NONE;
};

class GpiodRegularBase : public GpioBase {
 public:
  GpiodRegularBase(gpio::GpioTypes gpioType, std::string consumer, gpio::Direction direction,
                   gpio::Levels initValue, int lineNum)
      : GpioBase(gpioType, consumer, direction, initValue), lineNum(lineNum) {}

  // line number will be configured at a later point for the open by line name configuration
  GpiodRegularBase(gpio::GpioTypes gpioType, std::string consumer, gpio::Direction direction,
                   gpio::Levels initValue)
      : GpioBase(gpioType, consumer, direction, initValue) {}

  int lineNum = 0;
  struct gpiod_line* lineHandle = nullptr;
};

class GpiodRegularByChip : public GpiodRegularBase {
 public:
  GpiodRegularByChip()
      : GpiodRegularBase(gpio::GpioTypes::GPIO_REGULAR_BY_CHIP, std::string(), gpio::Direction::IN,
                         gpio::Levels::LOW, 0) {}

  GpiodRegularByChip(std::string chipname_, int lineNum_, std::string consumer_,
                     gpio::Direction direction_, gpio::Levels initValue_)
      : GpiodRegularBase(gpio::GpioTypes::GPIO_REGULAR_BY_CHIP, consumer_, direction_, initValue_,
                         lineNum_),
        chipname(chipname_) {}

  GpiodRegularByChip(std::string chipname_, int lineNum_, std::string consumer_)
      : GpiodRegularBase(gpio::GpioTypes::GPIO_REGULAR_BY_CHIP, consumer_, gpio::Direction::IN,
                         gpio::Levels::LOW, lineNum_),
        chipname(chipname_) {}

  std::string chipname;
};

class GpiodRegularByLabel : public GpiodRegularBase {
 public:
  GpiodRegularByLabel(std::string label_, int lineNum_, std::string consumer_,
                      gpio::Direction direction_, gpio::Levels initValue_)
      : GpiodRegularBase(gpio::GpioTypes::GPIO_REGULAR_BY_LABEL, consumer_, direction_, initValue_,
                         lineNum_),
        label(label_) {}

  GpiodRegularByLabel(std::string label_, int lineNum_, std::string consumer_)
      : GpiodRegularBase(gpio::GpioTypes::GPIO_REGULAR_BY_LABEL, consumer_, gpio::Direction::IN,
                         gpio::Levels::LOW, lineNum_),
        label(label_) {}

  std::string label;
};

/**
 * @brief   Passing this GPIO configuration to the GPIO IF object will try to open the GPIO by its
 *          line name. This line name can be set in the device tree and must be unique. Otherwise
 *          the driver will open the first line with the given name.
 */
class GpiodRegularByLineName : public GpiodRegularBase {
 public:
  GpiodRegularByLineName(std::string lineName_, std::string consumer_, gpio::Direction direction_,
                         gpio::Levels initValue_)
      : GpiodRegularBase(gpio::GpioTypes::GPIO_REGULAR_BY_LINE_NAME, consumer_, direction_,
                         initValue_),
        lineName(lineName_) {}

  GpiodRegularByLineName(std::string lineName_, std::string consumer_)
      : GpiodRegularBase(gpio::GpioTypes::GPIO_REGULAR_BY_LINE_NAME, consumer_, gpio::Direction::IN,
                         gpio::Levels::LOW),
        lineName(lineName_) {}

  std::string lineName;
};

class GpioCallback : public GpioBase {
 public:
  GpioCallback(std::string consumer, gpio::Direction direction_, gpio::Levels initValue_,
               gpio::gpio_cb_t callback, void* callbackArgs)
      : GpioBase(gpio::GpioTypes::CALLBACK, consumer, direction_, initValue_),
        callback(callback),
        callbackArgs(callbackArgs) {}

  gpio::gpio_cb_t callback = nullptr;
  void* callbackArgs = nullptr;
};

using GpioMap = std::map<gpioId_t, GpioBase*>;
using GpioUnorderedMap = std::unordered_map<gpioId_t, GpioBase*>;
using GpioMapIter = GpioMap::iterator;
using GpioUnorderedMapIter = GpioUnorderedMap::iterator;

#endif /* LINUX_GPIO_GPIODEFINITIONS_H_ */