#pragma once

// Internal header shared between gateway_knx.cpp and gateway_knx_router.cpp.

#include "driver/uart.h"
#include "freertos/FreeRTOS.h"
#include "freertos/semphr.h"
#include "soc/uart_periph.h"

#include <cstdint>
#include <string>

namespace gateway {
namespace knx_internal {

constexpr const char* kTag = "gateway_knx";

// RAII semaphore guard.
class SemaphoreGuard {
 public:
  explicit SemaphoreGuard(SemaphoreHandle_t semaphore) : semaphore_(semaphore) {
    if (semaphore_ != nullptr) {
      xSemaphoreTake(semaphore_, portMAX_DELAY);
      locked_ = true;
    }
  }
  ~SemaphoreGuard() {
    if (locked_) {
      xSemaphoreGive(semaphore_);
    }
  }
 private:
  SemaphoreHandle_t semaphore_{nullptr};
  bool locked_{false};
};

// Resolve a UART IO pin from config or SoC defaults.
inline bool ResolveUartIoPin(uart_port_t uart_port, int configured_pin,
                             uint32_t pin_index, int* resolved_pin) {
  if (resolved_pin == nullptr) return false;
  if (configured_pin >= 0) {
    *resolved_pin = configured_pin;
    return true;
  }
  if (uart_port < 0 || uart_port >= SOC_UART_NUM ||
      pin_index >= SOC_UART_PINS_COUNT) {
    *resolved_pin = UART_PIN_NO_CHANGE;
    return false;
  }
  const int default_pin =
      uart_periph_signal[uart_port].pins[pin_index].default_gpio;
  if (default_pin < 0) {
    *resolved_pin = UART_PIN_NO_CHANGE;
    return false;
  }
  *resolved_pin = default_pin;
  return true;
}

}  // namespace knx_internal
}  // namespace gateway