#include <sta/spi_settings.hpp>

#include <sta/assert.hpp>
#include <sta/lang.hpp>


namespace sta
{
	SpiClkPolarity getSpiClkPolarity(SpiMode mode)
	{
		switch (mode)
		{
		case SpiMode::MODE_0:
		case SpiMode::MODE_1:
			return SpiClkPolarity::LOW;

		case SpiMode::MODE_2:
		case SpiMode::MODE_3:
			return SpiClkPolarity::HIGH;

		default:
			// Unreachable case
			STA_ASSERT_MSG(false, "Case for SpiMode enum not handled");
			STA_UNREACHABLE();
		}
	}

	SpiClkPhase getSpiClkPhase(SpiMode mode)
	{
		switch (mode)
		{
		case SpiMode::MODE_0:
		case SpiMode::MODE_2:
			return SpiClkPhase::EDGE_1;

		case SpiMode::MODE_1:
		case SpiMode::MODE_3:
			return SpiClkPhase::EDGE_2;

		default:
			// Unreachable case
			STA_ASSERT_MSG(false, "Case for SpiMode enum not handled");
			STA_UNREACHABLE();
		}
	}

	SpiMode getSpiMode(SpiClkPolarity polarity, SpiClkPhase phase)
	{
		if (polarity == SpiClkPolarity::LOW)
		{
			if (phase == SpiClkPhase::EDGE_1)
			{
				return SpiMode::MODE_0;
			}
			else
			{
				return SpiMode::MODE_1;
			}
		}
		else
		{
			if (phase == SpiClkPhase::EDGE_1)
			{
				return SpiMode::MODE_2;
			}
			else
			{
				return SpiMode::MODE_3;
			}
		}
	}
} // namespace sta