ThaiVowel

public static class ThaiVowel
{
	// Lower level characters
	private const int SARA_U = 3640;
	private const int SARA_UU = 3641;
	private const int PHINTHU = 3642;

	// Lower level characters after pullDown
	private const int SARA_U_DOWN = 63256;
	private const int SARA_UU_DOWN = 63257;
	private const int PHINTHU_DOWN = 63258;

	// Upper level 1 characters
	private const int MAI_HAN_AKAT = 3633;
	private const int SARA_AM = 3635;
	private const int SARA_I = 3636;
	private const int SARA_Ii = 3637;
	private const int SARA_Ue = 3638;
	private const int SARA_Uee = 3639;
	private const int MAI_TAI_KHU = 3655;

	// Upper level 1 characters after shift left
	private const int MAI_HAN_AKAT_LEFT_SHIFT = 63248;
	private const int SARA_I_LEFT_SHIFT = 63233;
	private const int SARA_Ii_LEFT_SHIFT = 63234;
	private const int SARA_Ue_LEFT_SHIFT = 63235;
	private const int SARA_Uee_LEFT_SHIFT = 63236;
	private const int MAI_TAI_KHU_LEFT_SHIFT = 63250;

	// Upper level 2 characters
	private const int MAI_EK = 3656;
	private const int MAI_THO = 3657;
	private const int MAI_TRI = 3658;
	private const int MAI_CHATTAWA = 3659;
	private const int THANTHAKHAT = 3660;
	private const int NIKHAHIT = 3661;

	// Upper level 2 characters after pull down
	private const int MAI_EK_DOWN = 63242;
	private const int MAI_THO_DOWN = 63243;
	private const int MAI_TRI_DOWN = 63244;
	private const int MAI_CHATTAWA_DOWN = 63245;
	private const int THANTHAKHAT_DOWN = 63246;

	// Upper level 2 characters after pull down and shift left
	private const int MAI_EK_PULL_DOWN_AND_LEFT_SHIFT = 63237;
	private const int MAI_THO_PULL_DOWN_AND_LEFT_SHIFT = 63238;
	private const int MAI_TRI_PULL_DOWN_AND_LEFT_SHIFT = 63239;
	private const int MAI_CHATTAWA_PULL_DOWN_AND_LEFT_SHIFT = 63240;
	private const int THANTHAKHAT_PULL_DOWN_AND_LEFT_SHIFT = 63241;

	// Upper level 2 characters after shift left
	private const int MAI_EK_LEFT_SHIFT = 63251;
	private const int MAI_THO_LEFT_SHIFT = 63252;
	private const int MAI_TRI_LEFT_SHIFT = 63253;
	private const int MAI_CHATTAWA_LEFT_SHIFT = 63254;
	private const int THANTHAKHAT_LEFT_SHIFT = 63255;
	private const int NIKHAHIT_LEFT_SHIFT = 63249;

	// Up tail characters
	private const int PO_PLA = 3611;
	private const int FO_FA = 3613;
	private const int FO_FAN = 3615;
	private const int LOchULA = 3628;

	// Down tail characters
	private const int THO_THAN = 3600;
	private const int YO_YING = 3597;
	private const int DOchADA = 3598;
	private const int TO_PATAK = 3599;
	private const int RU = 3620;
	private const int LU = 3622;

	// Cut tail characters
	private const int THO_THAN_CUT_TAIL = 63232;
	private const int YO_YING_CUT_TAIL = 63247;

	// for exploded SARA_AM (NIKHAHIT + SARA_AA)
	private const int SARA_AA = 3634;

	private static int GetPullUpCharacter(int charCode)
	{
		switch (charCode)
		{
			case MAI_EK_DOWN: return MAI_EK;
			case MAI_THO_DOWN: return MAI_THO;
			case MAI_TRI_DOWN: return MAI_TRI;
			case MAI_CHATTAWA_DOWN: return MAI_CHATTAWA;
			case THANTHAKHAT_DOWN: return THANTHAKHAT;
			case SARA_U_DOWN: return SARA_U;
			case SARA_UU_DOWN: return SARA_UU;
			case PHINTHU_DOWN: return PHINTHU;
			default: return charCode;
		}
	}

	private static int GetPullDownCharacter(int charCode)
	{
		switch (charCode)
		{
			case MAI_EK: return MAI_EK_DOWN;
			case MAI_THO: return MAI_THO_DOWN;
			case MAI_TRI: return MAI_TRI_DOWN;
			case MAI_CHATTAWA: return MAI_CHATTAWA_DOWN;
			case THANTHAKHAT: return THANTHAKHAT_DOWN;
			case SARA_U: return SARA_U_DOWN;
			case SARA_UU: return SARA_UU_DOWN;
			case PHINTHU: return PHINTHU_DOWN;
			default: return charCode;
		}
	}

	private static int GetCutTailCharacter(int charCode)
	{
		switch (charCode)
		{
			case THO_THAN: return THO_THAN_CUT_TAIL;
			case YO_YING: return YO_YING_CUT_TAIL;
			default: return charCode;
		}
	}

	private static int GetShiftLeftCharacter(int charCode)
	{
		switch (charCode)
		{
			case MAI_EK: return MAI_EK_LEFT_SHIFT;
			case MAI_THO: return MAI_THO_LEFT_SHIFT;
			case MAI_TRI: return MAI_TRI_LEFT_SHIFT;
			case MAI_CHATTAWA: return MAI_CHATTAWA_LEFT_SHIFT;
			case MAI_HAN_AKAT: return MAI_HAN_AKAT_LEFT_SHIFT;
			case SARA_I: return SARA_I_LEFT_SHIFT;
			case SARA_Ii: return SARA_Ii_LEFT_SHIFT;
			case SARA_Ue: return SARA_Ue_LEFT_SHIFT;
			case SARA_Uee: return SARA_Uee_LEFT_SHIFT;
			case MAI_TAI_KHU: return MAI_TAI_KHU_LEFT_SHIFT;
			case NIKHAHIT: return NIKHAHIT_LEFT_SHIFT;
			default: return charCode;
		}
	}

	private static int GetPullDownAndShiftLeftCharacter(int charCode)
	{
		switch (charCode)
		{
			case MAI_EK: return MAI_EK_PULL_DOWN_AND_LEFT_SHIFT;
			case MAI_THO: return MAI_THO_PULL_DOWN_AND_LEFT_SHIFT;
			case MAI_TRI: return MAI_TRI_PULL_DOWN_AND_LEFT_SHIFT;
			case MAI_CHATTAWA: return MAI_CHATTAWA_PULL_DOWN_AND_LEFT_SHIFT;
			case MAI_HAN_AKAT: return MAI_HAN_AKAT_LEFT_SHIFT;
			case THANTHAKHAT: return THANTHAKHAT_PULL_DOWN_AND_LEFT_SHIFT;
			default: return charCode;
		}
	}

	private static bool IsPullDown(int charCode)
	{
		return charCode == MAI_EK_DOWN || charCode == MAI_THO_DOWN ||
			charCode == MAI_TRI_DOWN || charCode == MAI_CHATTAWA_DOWN ||
			charCode == THANTHAKHAT_DOWN || charCode == SARA_U_DOWN ||
			charCode == SARA_UU_DOWN || charCode == PHINTHU_DOWN;
	}

	private static bool IsUpTail(int charCode)
	{
		return charCode == PO_PLA || charCode == FO_FA || charCode == FO_FAN
			|| charCode == LOchULA;
	}

	private static bool IsDownTail(int charCode)
	{
		return charCode == THO_THAN || charCode == YO_YING || charCode == DOchADA
			|| charCode == TO_PATAK || charCode == RU || charCode == LU;
	}

	private static bool IsUpperLevel1(int charCode)
	{
		return charCode == MAI_HAN_AKAT || charCode == SARA_I || charCode == SARA_Ii
			|| charCode == SARA_Ue || charCode == SARA_Uee || charCode == MAI_TAI_KHU
			|| charCode == NIKHAHIT;
	}

	private static bool IsUpperLevel2(int charCode)
	{
		return charCode == MAI_EK || charCode == MAI_THO || charCode == MAI_TRI
			|| charCode == MAI_CHATTAWA || charCode == THANTHAKHAT;
	}

	private static bool IsLeftShiftUpperLevel1(int charCode)
	{
		return charCode == MAI_HAN_AKAT_LEFT_SHIFT || charCode == SARA_I_LEFT_SHIFT
			|| charCode == SARA_Ii_LEFT_SHIFT || charCode == SARA_Ue_LEFT_SHIFT
			|| charCode == SARA_Uee_LEFT_SHIFT || charCode == MAI_TAI_KHU_LEFT_SHIFT
			|| charCode == NIKHAHIT_LEFT_SHIFT;
	}

	private static bool IsLowerLevel(int charCode)
	{
		return charCode == SARA_U || charCode == SARA_UU || charCode == PHINTHU;
	}

	private static bool IsSaraAm(int charCode)
	{
		return charCode == SARA_AM;
	}

	public static bool IsOnCharVowel(int charCode)
	{
		return IsPullDown(charCode) ||
		       IsUpperLevel1(charCode) ||
		       IsUpperLevel2(charCode) ||
		       IsLeftShiftUpperLevel1(charCode) ||
		       IsLowerLevel(charCode);
	}
}