// for finding memory leaks in debug mode with Visual Studio 
#if defined _DEBUG && defined _MSC_VER
#include <crtdbg.h>
#endif

#include <stdint.h>
#include <stdbool.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#ifdef _WIN32
#include <direct.h>
#else
#include <unistd.h>
#endif
#include "pt2_header.h"
#include "pt2_helpers.h"
#include "pt2_textout.h"
#include "pt2_tables.h"
#include "pt2_audio.h"
#include "pt2_diskop.h"
#include "pt2_mouse.h"
#include "pt2_sampler.h"
#include "pt2_visuals.h"
#include "pt2_keyboard.h"
#include "pt2_scopes.h"
#include "pt2_structs.h"
#include "pt2_config.h"
#include "pt2_audio.h"
#include "pt2_sync.h"
#include "pt2_chordmaker.h"

const int8_t scancode2NoteLo[52] = // "USB usage page standard" order
{
	 7,  4,  3, 16, -1,  6,  8, 24,
	10, -1, 13, 11,  9, 26, 28, 12,
	17,  1, 19, 23,  5, 14,  2, 21,
	 0, -1, 13, 15, -1, 18, 20, 22,
	-1, 25, 27, -1, -1, -1, -1, -1,
	-1, 30, 29, 31, 30, -1, 15, -1,
	-1, 12, 14, 16
};

const int8_t scancode2NoteHi[52] = // "USB usage page standard" order
{
	19, 16, 15, 28, -1, 18, 20, -2,
	22, -1, 25, 23, 21, -2, -2, 24,
	29, 13, 31, 35, 17, 26, 14, 33,
	12, -1, 25, 27, -1, 30, 32, 34,
	-1, -2, -2, -1, -1, -1, -1, -1,
	-1, -2, -2, -2, -2, -1, 27, -1,
	-1, 24, 26, 28
};

void setPattern(int16_t pattern); // pt2_replayer.c

void jamAndPlaceSample(SDL_Scancode scancode,  bool normalMode);
uint8_t quantizeCheck(uint8_t row);
bool handleSpecialKeys(SDL_Scancode scancode);
int8_t keyToNote(SDL_Scancode scancode);

// used for re-rendering text object while editing it
void updateTextObject(int16_t editObject)
{
	switch (editObject)
	{
		default: break;
		case PTB_SONGNAME: ui.updateSongName = true; break;
		case PTB_SAMPLENAME: ui.updateCurrSampleName = true; break;
		case PTB_PE_PATT: ui.updatePosEd = true; break;
		case PTB_EO_QUANTIZE: ui.updateQuantizeText = true; break;
		case PTB_EO_METRO_1: ui.updateMetro1Text = true; break;
		case PTB_EO_METRO_2: ui.updateMetro2Text = true; break;
		case PTB_EO_FROM_NUM: ui.updateFromText = true; break;
		case PTB_EO_TO_NUM: ui.updateToText = true; break;
		case PTB_EO_MIX: ui.updateMixText = true; break;
		case PTB_EO_POS_NUM: ui.updatePosText = true; break;
		case PTB_EO_MOD_NUM: ui.updateModText = true; break;
		case PTB_EO_VOL_NUM: ui.updateVolText = true; break;
		case PTB_DO_DATAPATH: ui.updateDiskOpPathText = true; break;
		case PTB_POSS: ui.updateSongPos = true; break;
		case PTB_PATTERNS: ui.updateSongPattern = true; break;
		case PTB_LENGTHS: ui.updateSongLength = true; break;
		case PTB_SAMPLES: ui.updateCurrSampleNum = true; break;
		case PTB_SVOLUMES: ui.updateCurrSampleVolume = true; break;
		case PTB_SLENGTHS: ui.updateCurrSampleLength = true; break;
		case PTB_SREPEATS: ui.updateCurrSampleRepeat = true; break;
		case PTB_SREPLENS: ui.updateCurrSampleReplen = true; break;
		case PTB_PATTDATA: ui.updateCurrPattText = true; break;
		case PTB_SA_VOL_FROM_NUM: ui.updateVolFromText = true; break;
		case PTB_SA_VOL_TO_NUM: ui.updateVolToText = true; break;
		case PTB_SA_FIL_LP_CUTOFF: ui.updateLPText = true; break;
		case PTB_SA_FIL_HP_CUTOFF: ui.updateHPText = true; break;
	}
}

void exitGetTextLine(bool updateValue)
{
	int8_t tmp8;
	int16_t posEdPos, tmp16;
	int32_t tmp32;
	UNICHAR *pathU;
	moduleSample_t *s;

	SDL_StopTextInput();

	// if user updated the disk op path text
	if (ui.diskOpScreenShown && ui.editObject == PTB_DO_DATAPATH)
	{
		pathU = (UNICHAR *)calloc(PATH_MAX + 2, sizeof (UNICHAR));
		if (pathU != NULL)
		{
#ifdef _WIN32
			MultiByteToWideChar(CP_ACP, MB_PRECOMPOSED, editor.currPath, -1, pathU, PATH_MAX);
#else
			strcpy(pathU, editor.currPath);
#endif
			diskOpSetPath(pathU, DISKOP_CACHE);
			free(pathU);
		}
	}

	if (ui.editTextType != TEXT_EDIT_STRING)
	{
		if (ui.dstPos != ui.numLen)
			removeTextEditMarker();

		updateTextObject(ui.editObject);
	}
	else
	{
		removeTextEditMarker();

		// yet another kludge...
		if (ui.editObject == PTB_PE_PATT)
			ui.updatePosEd = true;
	}

	ui.editTextFlag = false;

	ui.lineCurX = 0;
	ui.lineCurY = 0;
	ui.editPos = NULL;
	ui.dstPos = 0;

	if (ui.editTextType == TEXT_EDIT_STRING)
	{
		if (ui.dstOffset != NULL)
			*ui.dstOffset = '\0';

		pointerSetPreviousMode();

		if (!editor.mixFlag)
			updateWindowTitle(MOD_IS_MODIFIED);
	}
	else
	{
		// set back GUI text pointers and update values (if requested)

		s = &song->samples[editor.currSample];
		switch (ui.editObject)
		{
			case PTB_SA_FIL_LP_CUTOFF:
			{
				editor.lpCutOffDisp = &editor.lpCutOff;

				if (updateValue)
				{
					editor.lpCutOff = ui.tmpDisp16;
					if (editor.lpCutOff > (uint16_t)(FILTERS_BASE_FREQ/2))
						editor.lpCutOff = (uint16_t)(FILTERS_BASE_FREQ/2);

					ui.updateLPText = true;
				}
			}
			break;

			case PTB_SA_FIL_HP_CUTOFF:
			{
				editor.hpCutOffDisp = &editor.hpCutOff;

				if (updateValue)
				{
					editor.hpCutOff = ui.tmpDisp16;
					if (editor.hpCutOff > (uint16_t)(FILTERS_BASE_FREQ/2))
						editor.hpCutOff = (uint16_t)(FILTERS_BASE_FREQ/2);

					ui.updateHPText = true;
				}
			}
			break;

			case PTB_SA_VOL_FROM_NUM:
			{
				editor.vol1Disp = &editor.vol1;

				if (updateValue)
				{
					editor.vol1 = ui.tmpDisp16;
					if (editor.vol1 > 200)
						editor.vol1 = 200;

					ui.updateVolFromText = true;
					showVolFromSlider();
				}
			}
			break;

			case PTB_SA_VOL_TO_NUM:
			{
				editor.vol2Disp = &editor.vol2;

				if (updateValue)
				{
					editor.vol2 = ui.tmpDisp16;
					if (editor.vol2 > 200)
						editor.vol2 = 200;

					ui.updateVolToText = true;
					showVolToSlider();
				}
			}
			break;

			case PTB_EO_VOL_NUM:
			{
				editor.sampleVolDisp = &editor.sampleVol;

				if (updateValue)
				{
					editor.sampleVol = ui.tmpDisp16;
					ui.updateVolText = true;
				}
			}
			break;

			case PTB_EO_POS_NUM:
			{
				editor.samplePosDisp = &editor.samplePos;

				if (updateValue)
				{
					editor.samplePos = ui.tmpDisp32;
					if (editor.samplePos > config.maxSampleLength)
						editor.samplePos = config.maxSampleLength;

					if (editor.samplePos > song->samples[editor.currSample].length)
						editor.samplePos = song->samples[editor.currSample].length;

					ui.updatePosText = true;
				}
			}
			break;

			case PTB_EO_QUANTIZE:
			{
				editor.quantizeValueDisp = &config.quantizeValue;

				if (updateValue)
				{
					if (ui.tmpDisp16 > 63)
						ui.tmpDisp16 = 63;

					config.quantizeValue = ui.tmpDisp16;
					ui.updateQuantizeText = true;
				}
			}
			break;

			case PTB_EO_METRO_1: // metronome speed
			{
				editor.metroSpeedDisp = &editor.metroSpeed;

				if (updateValue)
				{
					if (ui.tmpDisp16 > 64)
						ui.tmpDisp16 = 64;

					editor.metroSpeed = ui.tmpDisp16;
					ui.updateMetro1Text = true;
				}
			}
			break;

			case PTB_EO_METRO_2: // metronome channel
			{
				editor.metroChannelDisp = &editor.metroChannel;

				if (updateValue)
				{
					if (ui.tmpDisp16 > 4)
						ui.tmpDisp16 = 4;

					editor.metroChannel = ui.tmpDisp16;
					ui.updateMetro2Text = true;
				}
			}
			break;

			case PTB_EO_FROM_NUM:
			{
				editor.sampleFromDisp = &editor.sampleFrom;

				if (updateValue)
				{
					editor.sampleFrom = ui.tmpDisp8;

					// signed check + normal check
					if (editor.sampleFrom < 0x00 || editor.sampleFrom > 0x1F)
						editor.sampleFrom = 0x1F;

					ui.updateFromText = true;
				}
			}
			break;

			case PTB_EO_TO_NUM:
			{
				editor.sampleToDisp = &editor.sampleTo;

				if (updateValue)
				{
					editor.sampleTo = ui.tmpDisp8;

					// signed check + normal check
					if (editor.sampleTo < 0x00 || editor.sampleTo > 0x1F)
						editor.sampleTo = 0x1F;

					ui.updateToText = true;
				}
			}
			break;

			case PTB_PE_PATT:
			{
				posEdPos = song->currOrder;
				if (posEdPos > song->header.numOrders-1)
					posEdPos = song->header.numOrders-1;

				editor.currPosEdPattDisp = &song->header.order[posEdPos];

				if (updateValue)
				{
					if (ui.tmpDisp16 > MAX_PATTERNS-1)
						ui.tmpDisp16 = MAX_PATTERNS-1;

					song->header.order[posEdPos] = ui.tmpDisp16;

					updateWindowTitle(MOD_IS_MODIFIED);

					if (ui.posEdScreenShown)
						ui.updatePosEd = true;

					ui.updateSongPattern = true;
					ui.updateSongSize = true;
				}
			}
			break;

			case PTB_POSS:
			{
				editor.currPosDisp = &song->currOrder;

				if (updateValue)
				{
					tmp16 = ui.tmpDisp16;
					if (tmp16 > 126)
						tmp16 = 126;

					if (song->currOrder != tmp16)
					{
						song->currOrder = tmp16;
						editor.currPatternDisp = &song->header.order[song->currOrder];

						if (ui.posEdScreenShown)
							ui.updatePosEd = true;

						ui.updateSongPos = true;
						ui.updatePatternData = true;
					}
				}
			}
			break;

			case PTB_PATTERNS:
			{
				editor.currPatternDisp = &song->header.order[song->currOrder];

				if (updateValue)
				{
					tmp16 = ui.tmpDisp16;
					if (tmp16 > MAX_PATTERNS-1)
						tmp16 = MAX_PATTERNS-1;

					if (song->header.order[song->currOrder] != tmp16)
					{
						song->header.order[song->currOrder] = tmp16;

						updateWindowTitle(MOD_IS_MODIFIED);

						if (ui.posEdScreenShown)
							ui.updatePosEd = true;

						ui.updateSongPattern = true;
						ui.updateSongSize = true;
					}
				}
			}
			break;

			case PTB_LENGTHS:
			{
				editor.currLengthDisp = &song->header.numOrders;

				if (updateValue)
				{
					tmp16 = CLAMP(ui.tmpDisp16, 1, 127);

					if (song->header.numOrders != tmp16)
					{
						song->header.numOrders = tmp16;

						posEdPos = song->currOrder;
						if (posEdPos > song->header.numOrders-1)
							posEdPos = song->header.numOrders-1;

						editor.currPosEdPattDisp = &song->header.order[posEdPos];

						if (ui.posEdScreenShown)
							ui.updatePosEd = true;

						ui.updateSongLength = true;
						ui.updateSongSize = true;
						updateWindowTitle(MOD_IS_MODIFIED);
					}
				}
			}
			break;

			case PTB_PATTDATA:
			{
				editor.currEditPatternDisp = &song->currPattern;

				if (updateValue)
				{
					if (song->currPattern != ui.tmpDisp16)
					{
						setPattern(ui.tmpDisp16);
						ui.updatePatternData = true;
						ui.updateCurrPattText = true;
					}
				}
			}
			break;

			case PTB_SAMPLES:
			{
				editor.currSampleDisp = &editor.currSample;

				if (updateValue)
				{
					tmp8 = ui.tmpDisp8;
					if (tmp8 < 0x00) // (signed) if >0x7F was entered, clamp to 0x1F
						tmp8 = 0x1F;

					tmp8 = CLAMP(tmp8, 0x01, 0x1F) - 1;

					if (tmp8 != editor.currSample)
					{
						editor.currSample = tmp8;
						updateCurrSample();
					}
				}
			}
			break;

			case PTB_SVOLUMES:
			{
				s->volumeDisp = &s->volume;

				if (updateValue)
				{
					tmp8 = ui.tmpDisp8;

					// signed check + normal check
					if (tmp8 < 0x00 || tmp8 > 0x40)
						 tmp8 = 0x40;

					if (s->volume != tmp8)
					{
						s->volume = tmp8;
						ui.updateCurrSampleVolume = true;
						updateWindowTitle(MOD_IS_MODIFIED);
					}
				}
			}
			break;

			case PTB_SLENGTHS:
			{
				s->lengthDisp = &s->length;

				if (updateValue)
				{
					tmp32 = ui.tmpDisp32 & ~1; // even'ify
					if (tmp32 > config.maxSampleLength)
						tmp32 = config.maxSampleLength;

					if (s->loopStart+s->loopLength > 2)
					{
						if (tmp32 < s->loopStart+s->loopLength)
							tmp32 = s->loopStart+s->loopLength;
					}

					tmp32 &= ~1;

					if (s->length != tmp32)
					{
						turnOffVoices();
						s->length = tmp32;

						ui.updateCurrSampleLength = true;
						ui.updateSongSize = true;
						updateSamplePos();

						if (ui.samplerScreenShown)
							redrawSample();

						recalcChordLength();
						updateWindowTitle(MOD_IS_MODIFIED);
					}
				}
			}
			break;

			case PTB_SREPEATS:
			{
				s->loopStartDisp = &s->loopStart;

				if (updateValue)
				{
					tmp32 = ui.tmpDisp32 & ~1; // even'ify
					if (tmp32 > config.maxSampleLength)
						tmp32 = config.maxSampleLength;

					if (s->length >= s->loopLength)
					{
						if (tmp32+s->loopLength > s->length)
							 tmp32 = s->length - s->loopLength;
					}
					else
					{
						tmp32 = 0;
					}

					tmp32 &= ~1;

					if (s->loopStart != tmp32)
					{
						turnOffVoices();
						s->loopStart = tmp32;
						mixerUpdateLoops();

						ui.updateCurrSampleRepeat = true;

						if (ui.editOpScreenShown && ui.editOpScreen == 3)
							ui.updateChordLengthText = true;

						if (ui.samplerScreenShown)
							setLoopSprites();

						updateWindowTitle(MOD_IS_MODIFIED);
					}
				}
			}
			break;

			case PTB_SREPLENS:
			{
				s->loopLengthDisp = &s->loopLength;

				if (updateValue)
				{
					tmp32 = ui.tmpDisp32 & ~1; // even'ify
					if (tmp32 > config.maxSampleLength)
						tmp32 = config.maxSampleLength;

					if (s->length >= s->loopStart)
					{
						if (s->loopStart+tmp32 > s->length)
							tmp32 = s->length - s->loopStart;
					}
					else
					{
						tmp32 = 2;
					}

					tmp32 &= ~1;

					if (tmp32 < 2)
						tmp32 = 2;

					if (s->loopLength != tmp32)
					{
						turnOffVoices();
						s->loopLength = tmp32;
						mixerUpdateLoops();

						ui.updateCurrSampleReplen = true;
						if (ui.editOpScreenShown && ui.editOpScreen == 3)
							ui.updateChordLengthText = true;

						if (ui.samplerScreenShown)
							setLoopSprites();

						updateWindowTitle(MOD_IS_MODIFIED);
					}
				}
			}
			break;

			default: break;
		}

		pointerSetPreviousMode();
	}

	ui.editTextType = 0;
}

void getTextLine(int16_t editObject)
{
	pointerSetMode(POINTER_MODE_MSG1, NO_CARRY);

	ui.lineCurY = (ui.editTextPos / 40) + 5;
	ui.lineCurX = ((ui.editTextPos % 40) * FONT_CHAR_W) + 4;
	ui.dstPtr = ui.showTextPtr;
	ui.editPos = ui.showTextPtr;
	ui.dstPos = 0;
	ui.editTextFlag = true;
	ui.editTextType = TEXT_EDIT_STRING;
	ui.editObject = editObject;

	if (ui.dstOffset != NULL)
		ui.dstOffset[0] = '\0';

	// kludge
	if (editor.mixFlag)
	{
		textCharNext();
		textCharNext();
		textCharNext();
		textCharNext();
	}

	renderTextEditMarker();
	SDL_StartTextInput();
}

void getNumLine(uint8_t type, int16_t editObject)
{
	pointerSetMode(POINTER_MODE_MSG1, NO_CARRY);

	ui.lineCurY = (ui.editTextPos / 40) + 5;
	ui.lineCurX = ((ui.editTextPos % 40) * FONT_CHAR_W) + 4;
	ui.dstPos = 0;
	ui.editTextFlag = true;
	ui.editTextType = type;
	ui.editObject = editObject;

	renderTextEditMarker();
	SDL_StartTextInput();
}

void handleEditKeys(SDL_Scancode scancode, bool normalMode)
{
	int8_t key, hexKey, numberKey;
	note_t *note;

	if (ui.editTextFlag)
		return;

	if (ui.samplerScreenShown || (editor.currMode == MODE_IDLE || editor.currMode == MODE_PLAY))
	{
		// at this point it will only jam, not place it
		if (!keyb.leftAltPressed && !keyb.leftAmigaPressed && !keyb.leftCtrlPressed && !keyb.shiftPressed)
			jamAndPlaceSample(scancode, normalMode);

		return;
	}

	// handle modified (ALT/CTRL/SHIFT etc) keys for editing
	if (editor.currMode == MODE_EDIT || editor.currMode == MODE_RECORD)
	{
		if (handleSpecialKeys(scancode))
		{
			if (editor.currMode != MODE_RECORD)
				modSetPos(DONT_SET_ORDER, (song->currRow + editor.editMoveAdd) & 0x3F);

			return;
		}
	}

	// are we editing a note, or other stuff?
	if (cursor.mode != CURSOR_NOTE)
	{
		// if we held down any key modifier at this point, then do nothing
		if (keyb.leftAltPressed || keyb.leftAmigaPressed || keyb.leftCtrlPressed || keyb.shiftPressed)
			return;

		if (editor.currMode == MODE_EDIT || editor.currMode == MODE_RECORD)
		{
			if (scancode == SDL_SCANCODE_0)
				numberKey = 0;
			else if (scancode >= SDL_SCANCODE_1 && scancode <= SDL_SCANCODE_9)
				numberKey = (int8_t)scancode - (SDL_SCANCODE_1-1);
			else
				numberKey = -1;

			if (scancode >= SDL_SCANCODE_A && scancode <= SDL_SCANCODE_F)
				hexKey = 10 + ((int8_t)scancode - SDL_SCANCODE_A);
			else
				hexKey = -1;

			key = -1;
			if (numberKey != -1)
			{
				if (key == -1)
					key = 0;

				key += numberKey;
			}

			if (hexKey != -1)
			{
				if (key == -1)
					key = 0;

				key += hexKey;
			}

			note = &song->patterns[song->currPattern][(song->currRow * AMIGA_VOICES) + cursor.channel];

			switch (cursor.mode)
			{
				case CURSOR_SAMPLE1:
				{
					if (key != -1 && key < 2)
					{
						note->sample = (uint8_t)((note->sample % 0x10) | (key << 4));

						if (editor.currMode != MODE_RECORD)
							modSetPos(DONT_SET_ORDER, (song->currRow + editor.editMoveAdd) & 0x3F);

						updateWindowTitle(MOD_IS_MODIFIED);
					}
				}
				break;

				case CURSOR_SAMPLE2:
				{
					if (key != -1 && key < 16)
					{
						note->sample = (uint8_t)((note->sample & 16) | key);

						if (editor.currMode != MODE_RECORD)
							modSetPos(DONT_SET_ORDER, (song->currRow + editor.editMoveAdd) & 0x3F);

						updateWindowTitle(MOD_IS_MODIFIED);
					}
				}
				break;

				case CURSOR_CMD:
				{
					if (key != -1 && key < 16)
					{
						note->command = (uint8_t)key;

						if (editor.currMode != MODE_RECORD)
							modSetPos(DONT_SET_ORDER, (song->currRow + editor.editMoveAdd) & 0x3F);

						updateWindowTitle(MOD_IS_MODIFIED);
					}
				}
				break;

				case CURSOR_PARAM1:
				{
					if (key != -1 && key < 16)
					{
						note->param = (uint8_t)((note->param % 0x10) | (key << 4));

						if (editor.currMode != MODE_RECORD)
							modSetPos(DONT_SET_ORDER, (song->currRow + editor.editMoveAdd) & 0x3F);

						updateWindowTitle(MOD_IS_MODIFIED);
					}
				}
				break;

				case CURSOR_PARAM2:
				{
					if (key != -1 && key < 16)
					{
						note->param = (uint8_t)((note->param & 0xF0) | key);

						if (editor.currMode != MODE_RECORD)
							modSetPos(DONT_SET_ORDER, (song->currRow + editor.editMoveAdd) & 0x3F);

						updateWindowTitle(MOD_IS_MODIFIED);
					}
				}
				break;

				default: break;
			}
		}
	}
	else
	{
		if (scancode == SDL_SCANCODE_DELETE)
		{
			if (editor.currMode == MODE_EDIT || editor.currMode == MODE_RECORD)
			{
				note = &song->patterns[song->currPattern][(song->currRow * AMIGA_VOICES) + cursor.channel];

				if (!keyb.leftAltPressed)
				{
					note->sample = 0;
					note->period = 0;
				}

				if (keyb.shiftPressed || keyb.leftAltPressed)
				{
					note->command = 0;
					note->param = 0;
				}

				if (editor.currMode != MODE_RECORD)
					modSetPos(DONT_SET_ORDER, (song->currRow + editor.editMoveAdd) & 0x3F);

				updateWindowTitle(MOD_IS_MODIFIED);
			}
		}
		else
		{
			// if we held down any key modifier at this point, then do nothing
			if (keyb.leftAltPressed || keyb.leftAmigaPressed || keyb.leftCtrlPressed || keyb.shiftPressed)
				return;

			jamAndPlaceSample(scancode, normalMode);
		}
	}
}

bool handleSpecialKeys(SDL_Scancode scancode)
{
	note_t *patt, *note, *prevNote;

	if (!keyb.leftAltPressed)
		return false;

	patt = song->patterns[song->currPattern];
	note = &patt[(song->currRow * AMIGA_VOICES) + cursor.channel];
	prevNote = &patt[(((song->currRow - 1) & 0x3F) * AMIGA_VOICES) + cursor.channel];

	if (scancode >= SDL_SCANCODE_1 && scancode <= SDL_SCANCODE_0)
	{
		// insert stored effect (buffer[0..8])
		note->command = editor.effectMacros[scancode - SDL_SCANCODE_1] >> 8;
		note->param = editor.effectMacros[scancode - SDL_SCANCODE_1] & 0xFF;

		updateWindowTitle(MOD_IS_MODIFIED);
		return true;
	}

	// copy command+effect from above into current command+effect
	if (scancode == SDL_SCANCODE_BACKSLASH)
	{
		note->command = prevNote->command;
		note->param = prevNote->param;

		updateWindowTitle(MOD_IS_MODIFIED);
		return true;
	}

	// copy command+(effect + 1) from above into current command+effect
	if (scancode == SDL_SCANCODE_EQUALS)
	{
		note->command = prevNote->command;
		note->param = prevNote->param + 1; // wraps 0x00..0xFF

		updateWindowTitle(MOD_IS_MODIFIED);
		return true;
	}

	// copy command+(effect - 1) from above into current command+effect
	if (scancode == SDL_SCANCODE_MINUS)
	{
		note->command = prevNote->command;
		note->param = prevNote->param - 1; // wraps 0x00..0xFF

		updateWindowTitle(MOD_IS_MODIFIED);
		return true;
	}

	return false;
}

void handleSampleJamming(SDL_Scancode scancode) // used for the sampling feature (in SAMPLER)
{
	const int32_t ch = cursor.channel;

	if (scancode == SDL_SCANCODE_NONUSBACKSLASH)
	{
		turnOffVoices(); // magic "kill all voices" button
		return;
	}

	const int8_t noteVal = keyToNote(scancode);
	if (noteVal < 0 || noteVal > 35)
		return;

	moduleSample_t *s = &song->samples[editor.currSample];
	if (s->length <= 1)
		return;

	lockAudio();

	song->channels[ch].n_samplenum = editor.currSample; // needed for sample playback/sampling line

	const int8_t *n_start = &song->sampleData[s->offset];
	const int8_t vol = 64;
	const uint16_t n_length = (uint16_t)(s->length >> 1);
	const uint16_t period = periodTable[((s->fineTune & 0xF) * 37) + noteVal];

	paulaSetVolume(ch, vol);
	paulaSetPeriod(ch, period);
	paulaSetData(ch, n_start);
	paulaSetLength(ch, n_length);

	if (!editor.muted[ch])
		paulaStartDMA(ch);
	else
		paulaStopDMA(ch);

	// these take effect after the current DMA cycle is done
	paulaSetData(ch, NULL);
	paulaSetLength(ch, 1);

	unlockAudio();
}

void jamAndPlaceSample(SDL_Scancode scancode, bool normalMode)
{
	int8_t noteVal;
	uint8_t ch;
	int16_t tempPeriod;
	uint16_t cleanPeriod;
	moduleChannel_t *chn;
	moduleSample_t *s;
	note_t *note;

	ch = cursor.channel;
	assert(ch < AMIGA_VOICES);

	chn = &song->channels[ch];
	note = &song->patterns[song->currPattern][(quantizeCheck(song->currRow) * AMIGA_VOICES) + ch];

	noteVal = normalMode ? keyToNote(scancode) : pNoteTable[editor.currSample];
	if (noteVal >= 0)
	{
		s = &song->samples[editor.currSample];

		tempPeriod  = periodTable[((s->fineTune & 0xF) * 37) + noteVal];
		cleanPeriod = periodTable[noteVal];

		editor.currPlayNote = noteVal;

		// play current sample

		// don't play sample if we quantized to another row (will be played in modplayer instead)
		if (editor.currMode != MODE_RECORD || !editor.didQuantize)
		{
			lockAudio();

			chn->n_samplenum = editor.currSample;
			chn->n_volume = s->volume;
			chn->n_period = tempPeriod;
			chn->n_start = &song->sampleData[s->offset];
			chn->n_length = (uint16_t)((s->loopStart > 0) ? (s->loopStart + s->loopLength) >> 1 : s->length >> 1);
			chn->n_loopstart = &song->sampleData[s->offset + s->loopStart];
			chn->n_replen = (uint16_t)(s->loopLength >> 1);

			if (chn->n_length == 0)
				chn->n_length = 1;

			paulaSetVolume(ch, chn->n_volume);
			paulaSetPeriod(ch, chn->n_period);
			paulaSetData(ch, chn->n_start);
			paulaSetLength(ch, chn->n_length);

			if (!editor.muted[ch])
				paulaStartDMA(ch);
			else
				paulaStopDMA(ch);

			// these take effect after the current DMA cycle is done
			paulaSetData(ch, chn->n_loopstart);
			paulaSetLength(ch, chn->n_replen);

			unlockAudio();
		}

		// normalMode = normal keys, or else keypad keys (in jam mode)
		if (normalMode || editor.pNoteFlag != 0)
		{
			if (normalMode || editor.pNoteFlag == 2)
			{
				// insert note and sample number
				if (!ui.samplerScreenShown && (editor.currMode == MODE_EDIT || editor.currMode == MODE_RECORD))
				{
					note->sample = editor.sampleZero ? 0 : (editor.currSample + 1);
					note->period = cleanPeriod;

					if (editor.autoInsFlag)
					{
						note->command = editor.effectMacros[editor.autoInsSlot] >> 8;
						note->param = editor.effectMacros[editor.autoInsSlot] & 0xFF;
					}

					if (editor.currMode != MODE_RECORD)
						modSetPos(DONT_SET_ORDER, (song->currRow + editor.editMoveAdd) & 0x3F);

					updateWindowTitle(MOD_IS_MODIFIED);
				}
			}

			if (editor.multiFlag)
				gotoNextMulti();
		}

		updateSpectrumAnalyzer(s->volume, tempPeriod);
	}
	else if (noteVal == -2)
	{
		// delete note and sample if illegal note (= -2, -1 = ignore) key was entered

		if (normalMode || editor.pNoteFlag == 2)
		{
			if (!ui.samplerScreenShown && (editor.currMode == MODE_EDIT || editor.currMode == MODE_RECORD))
			{
				note->period = 0;
				note->sample = 0;

				if (editor.currMode != MODE_RECORD)
					modSetPos(DONT_SET_ORDER, (song->currRow + editor.editMoveAdd) & 0x3F);

				updateWindowTitle(MOD_IS_MODIFIED);
			}
		}
	}
}

uint8_t quantizeCheck(uint8_t row)
{
	assert(song != NULL);
	if (song == NULL)
		return row;

	const uint8_t quantize = (uint8_t)config.quantizeValue;

	editor.didQuantize = false;
	if (editor.currMode == MODE_RECORD)
	{
		if (quantize == 0)
		{
			return row;
		}
		else if (quantize == 1)
		{
			if (song->tick > song->speed>>1)
			{
				row = (row + 1) & 0x3F;
				editor.didQuantize = true;
			}
		}
		else
		{
			uint8_t tempRow = ((((quantize >> 1) + row) & 0x3F) / quantize) * quantize;
			if (tempRow > row)
				editor.didQuantize = true;

			return tempRow;
		}
	}

	return row;
}

void saveUndo(void)
{
	memcpy(editor.undoBuffer, song->patterns[song->currPattern], sizeof (note_t) * (AMIGA_VOICES * MOD_ROWS));
}

void undoLastChange(void)
{
	note_t data;

	for (uint16_t i = 0; i < MOD_ROWS*AMIGA_VOICES; i++)
	{
		data = editor.undoBuffer[i];
		editor.undoBuffer[i] = song->patterns[song->currPattern][i];
		song->patterns[song->currPattern][i] = data;
	}

	updateWindowTitle(MOD_IS_MODIFIED);
	ui.updatePatternData = true;
}

void copySampleTrack(void)
{
	uint8_t i;
	uint32_t tmpOffset;
	note_t *noteSrc;
	moduleSample_t *smpFrom, *smpTo;

	if (editor.trackPattFlag == 2)
	{
		// copy from one sample slot to another

		// never attempt to swap if from and/or to is 0
		if (editor.sampleFrom == 0 || editor.sampleTo == 0)
		{
			displayErrorMsg("FROM/TO = 0 !");
			return;
		}

		smpTo = &song->samples[editor.sampleTo - 1];
		smpFrom = &song->samples[editor.sampleFrom - 1];

		turnOffVoices();

		// copy
		tmpOffset = smpTo->offset;
		*smpTo = *smpFrom;
		smpTo->offset = tmpOffset;

		// update the copied sample's GUI text pointers
		smpTo->volumeDisp = &smpTo->volume;
		smpTo->lengthDisp = &smpTo->length;
		smpTo->loopStartDisp = &smpTo->loopStart;
		smpTo->loopLengthDisp = &smpTo->loopLength;

		// copy sample data
		memcpy(&song->sampleData[smpTo->offset], &song->sampleData[smpFrom->offset], config.maxSampleLength);

		updateCurrSample();
		ui.updateSongSize = true;
	}
	else
	{
		// copy sample number in track/pattern
		if (editor.trackPattFlag == 0)
		{
			for (i = 0; i < MOD_ROWS; i++)
			{
				noteSrc = &song->patterns[song->currPattern][(i * AMIGA_VOICES) + cursor.channel];
				if (noteSrc->sample == editor.sampleFrom)
					noteSrc->sample = editor.sampleTo;
			}
		}
		else
		{
			for (i = 0; i < AMIGA_VOICES; i++)
			{
				for (uint8_t j = 0; j < MOD_ROWS; j++)
				{
					noteSrc = &song->patterns[song->currPattern][(j * AMIGA_VOICES) + i];
					if (noteSrc->sample == editor.sampleFrom)
						noteSrc->sample = editor.sampleTo;
				}
			}
		}

		ui.updatePatternData = true;
	}

	editor.samplePos = 0;
	updateSamplePos();

	updateWindowTitle(MOD_IS_MODIFIED);
}

void exchSampleTrack(void)
{
	int8_t smp;
	int32_t i;
	uint32_t tmpOffset;
	moduleSample_t *smpFrom, *smpTo, smpTmp;
	note_t *noteSrc;

	if (editor.trackPattFlag == 2)
	{
		// exchange sample slots

		// never attempt to swap if from and/or to is 0
		if (editor.sampleFrom == 0 || editor.sampleTo == 0)
		{
			displayErrorMsg("FROM/TO = 0 !");
			return;
		}

		smpTo = &song->samples[editor.sampleTo-1];
		smpFrom = &song->samples[editor.sampleFrom-1];

		turnOffVoices();

		// swap offsets first so that the next swap will leave offsets intact
		tmpOffset = smpFrom->offset;
		smpFrom->offset = smpTo->offset;
		smpTo->offset = tmpOffset;

		// swap sample (now offsets are left as before)
		smpTmp = *smpFrom;
		*smpFrom = *smpTo;
		*smpTo = smpTmp;

		// update the swapped sample's GUI text pointers
		smpFrom->volumeDisp = &smpFrom->volume;
		smpFrom->lengthDisp = &smpFrom->length;
		smpFrom->loopStartDisp = &smpFrom->loopStart;
		smpFrom->loopLengthDisp = &smpFrom->loopLength;
		smpTo->volumeDisp = &smpTo->volume;
		smpTo->lengthDisp = &smpTo->length;
		smpTo->loopStartDisp = &smpTo->loopStart;
		smpTo->loopLengthDisp = &smpTo->loopLength;

		// swap sample data
		for (i = 0; i < config.maxSampleLength; i++)
		{
			smp = song->sampleData[smpFrom->offset+i];
			song->sampleData[smpFrom->offset+i] = song->sampleData[smpTo->offset+i];
			song->sampleData[smpTo->offset+i] = smp;
		}

		editor.sampleZero = false;

		updateCurrSample();
	}
	else
	{
		// exchange sample number in track/pattern
		if (editor.trackPattFlag == 0)
		{
			for (i = 0; i < MOD_ROWS; i++)
			{
				noteSrc = &song->patterns[song->currPattern][(i * AMIGA_VOICES) + cursor.channel];

				     if (noteSrc->sample == editor.sampleFrom) noteSrc->sample = editor.sampleTo;
				else if (noteSrc->sample == editor.sampleTo) noteSrc->sample = editor.sampleFrom;
			}
		}
		else
		{
			for (i = 0; i < AMIGA_VOICES; i++)
			{
				for (uint8_t j = 0; j < MOD_ROWS; j++)
				{
					noteSrc = &song->patterns[song->currPattern][(j * AMIGA_VOICES) + i];

					     if (noteSrc->sample == editor.sampleFrom) noteSrc->sample = editor.sampleTo;
					else if (noteSrc->sample == editor.sampleTo) noteSrc->sample = editor.sampleFrom;
				}
			}
		}

		ui.updatePatternData = true;
	}

	editor.samplePos = 0;
	updateSamplePos();

	updateWindowTitle(MOD_IS_MODIFIED);
}

void delSampleTrack(void)
{
	uint8_t i;
	note_t *noteSrc;

	saveUndo();
	if (editor.trackPattFlag == 0)
	{
		for (i = 0; i < MOD_ROWS; i++)
		{
			noteSrc = &song->patterns[song->currPattern][(i * AMIGA_VOICES) + cursor.channel];
			if (noteSrc->sample == editor.currSample+1)
			{
				noteSrc->period = 0;
				noteSrc->sample = 0;
				noteSrc->command = 0;
				noteSrc->param = 0;
			}
		}
	}
	else
	{
		for (i = 0; i < AMIGA_VOICES; i++)
		{
			for (uint8_t j = 0; j < MOD_ROWS; j++)
			{
				noteSrc = &song->patterns[song->currPattern][(j * AMIGA_VOICES) + i];
				if (noteSrc->sample == editor.currSample+1)
				{
					noteSrc->period = 0;
					noteSrc->sample = 0;
					noteSrc->command = 0;
					noteSrc->param = 0;
				}
			}
		}
	}

	updateWindowTitle(MOD_IS_MODIFIED);
	ui.updatePatternData = true;
}

void trackNoteUp(bool sampleAllFlag, uint8_t from, uint8_t to)
{
	bool noteDeleted;
	uint8_t j;
	note_t *noteSrc;

	if (from > to)
	{
		j = from;
		from = to;
		to = j;
	}

	saveUndo();
	for (uint8_t i = from; i <= to; i++)
	{
		noteSrc = &song->patterns[song->currPattern][(i * AMIGA_VOICES) + cursor.channel];

		if (!sampleAllFlag && noteSrc->sample != editor.currSample+1)
			continue;

		if (noteSrc->period)
		{
			// period -> note
			for (j = 0; j < 36; j++)
			{
				if (noteSrc->period >= periodTable[j])
					break;
			}

			noteDeleted = false;
			if (++j > 35)
			{
				j = 35;

				if (config.transDel)
				{
					noteSrc->period = 0;
					noteSrc->sample = 0;

					noteDeleted = true;
				}
			}

			if (!noteDeleted)
				noteSrc->period = periodTable[j];
		}
	}

	updateWindowTitle(MOD_IS_MODIFIED);
	ui.updatePatternData = true;
}

void trackNoteDown(bool sampleAllFlag, uint8_t from, uint8_t to)
{
	bool noteDeleted;
	int8_t j;
	note_t *noteSrc;

	if (from > to)
	{
		j = from;
		from = to;
		to = j;
	}

	saveUndo();
	for (uint8_t i = from; i <= to; i++)
	{
		noteSrc = &song->patterns[song->currPattern][(i * AMIGA_VOICES) + cursor.channel];

		if (!sampleAllFlag && noteSrc->sample != editor.currSample+1)
			continue;

		if (noteSrc->period)
		{
			// period -> note
			for (j = 0; j < 36; j++)
			{
				if (noteSrc->period >= periodTable[j])
					break;
			}

			noteDeleted = false;
			if (--j < 0)
			{
				j = 0;

				if (config.transDel)
				{
					noteSrc->period = 0;
					noteSrc->sample = 0;

					noteDeleted = true;
				}
			}

			if (!noteDeleted)
				noteSrc->period = periodTable[j];
		}
	}

	updateWindowTitle(MOD_IS_MODIFIED);
	ui.updatePatternData = true;
}

void trackOctaUp(bool sampleAllFlag, uint8_t from, uint8_t to)
{
	bool noteDeleted, noteChanged;
	uint8_t j;
	note_t *noteSrc;

	if (from > to)
	{
		j = from;
		from = to;
		to = j;
	}

	noteChanged = false;

	saveUndo();
	for (uint8_t i = from; i <= to; i++)
	{
		noteSrc = &song->patterns[song->currPattern][(i * AMIGA_VOICES) + cursor.channel];

		if (!sampleAllFlag && noteSrc->sample != editor.currSample+1)
			continue;

		if (noteSrc->period)
		{
			uint16_t oldPeriod = noteSrc->period;

			// period -> note
			for (j = 0; j < 36; j++)
			{
				if (noteSrc->period >= periodTable[j])
					break;
			}

			noteDeleted = false;
			if (j+12 > 35 && config.transDel)
			{
				noteSrc->period = 0;
				noteSrc->sample = 0;

				noteDeleted = true;
			}

			if (j <= 23)
				j += 12;

			if (!noteDeleted)
				noteSrc->period = periodTable[j];

			if (noteSrc->period != oldPeriod)
				noteChanged = true;
		}
	}

	if (noteChanged)
	{
		updateWindowTitle(MOD_IS_MODIFIED);
		ui.updatePatternData = true;
	}
}

void trackOctaDown(bool sampleAllFlag, uint8_t from, uint8_t to)
{
	bool noteDeleted;
	int8_t j;
	note_t *noteSrc;

	if (from > to)
	{
		j = from;
		from = to;
		to = j;
	}

	saveUndo();
	for (uint8_t i = from; i <= to; i++)
	{
		noteSrc = &song->patterns[song->currPattern][(i * AMIGA_VOICES) + cursor.channel];

		if (!sampleAllFlag && noteSrc->sample != editor.currSample+1)
			continue;

		if (noteSrc->period)
		{
			// period -> note
			for (j = 0; j < 36; j++)
			{
				if (noteSrc->period >= periodTable[j])
					break;
			}

			noteDeleted = false;
			if (j-12 < 0 && config.transDel)
			{
				noteSrc->period = 0;
				noteSrc->sample = 0;

				noteDeleted = true;
			}

			if (j >= 12)
				j -= 12;

			if (!noteDeleted)
				noteSrc->period = periodTable[j];
		}
	}

	updateWindowTitle(MOD_IS_MODIFIED);
	ui.updatePatternData = true;
}

void pattNoteUp(bool sampleAllFlag)
{
	bool noteDeleted;
	uint8_t k;
	note_t *noteSrc;

	saveUndo();
	for (uint8_t i = 0; i < AMIGA_VOICES; i++)
	{
		for (uint8_t j = 0; j < MOD_ROWS; j++)
		{
			noteSrc = &song->patterns[song->currPattern][(j * AMIGA_VOICES) + i];

			if (!sampleAllFlag && noteSrc->sample != editor.currSample+1)
				continue;

			if (noteSrc->period)
			{
				// period -> note
				for (k = 0; k < 36; k++)
				{
					if (noteSrc->period >= periodTable[k])
						break;
				}

				noteDeleted = false;
				if (++k > 35)
				{
					k = 35;

					if (config.transDel)
					{
						noteSrc->period = 0;
						noteSrc->sample = 0;

						noteDeleted = true;
					}
				}

				if (!noteDeleted)
					noteSrc->period = periodTable[k];
			}
		}
	}

	updateWindowTitle(MOD_IS_MODIFIED);
	ui.updatePatternData = true;
}

void pattNoteDown(bool sampleAllFlag)
{
	bool noteDeleted;
	int8_t k;
	note_t *noteSrc;

	saveUndo();
	for (uint8_t i = 0; i < AMIGA_VOICES; i++)
	{
		for (uint8_t j = 0; j < MOD_ROWS; j++)
		{
			noteSrc = &song->patterns[song->currPattern][(j * AMIGA_VOICES) + i];

			if (!sampleAllFlag && noteSrc->sample != editor.currSample+1)
				continue;

			if (noteSrc->period)
			{
				// period -> note
				for (k = 0; k < 36; k++)
				{
					if (noteSrc->period >= periodTable[k])
						break;
				}

				noteDeleted = false;
				if (--k < 0)
				{
					k = 0;

					if (config.transDel)
					{
						noteSrc->period = 0;
						noteSrc->sample = 0;

						noteDeleted = true;
					}
				}

				if (!noteDeleted)
					noteSrc->period = periodTable[k];
			}
		}
	}

	updateWindowTitle(MOD_IS_MODIFIED);
	ui.updatePatternData = true;
}

void pattOctaUp(bool sampleAllFlag)
{
	bool noteDeleted;
	uint8_t k;
	note_t *noteSrc;

	saveUndo();
	for (uint8_t i = 0; i < AMIGA_VOICES; i++)
	{
		for (uint8_t j = 0; j < MOD_ROWS; j++)
		{
			noteSrc = &song->patterns[song->currPattern][(j * AMIGA_VOICES) + i];

			if (!sampleAllFlag && noteSrc->sample != editor.currSample+1)
				continue;

			if (noteSrc->period)
			{
				// period -> note
				for (k = 0; k < 36; k++)
				{
					if (noteSrc->period >= periodTable[k])
						break;
				}

				noteDeleted = false;
				if (k+12 > 35 && config.transDel)
				{
					noteSrc->period = 0;
					noteSrc->sample = 0;

					noteDeleted = true;
				}

				if (k <= 23)
					k += 12;

				if (!noteDeleted)
					noteSrc->period = periodTable[k];
			}
		}
	}

	updateWindowTitle(MOD_IS_MODIFIED);
	ui.updatePatternData = true;
}

void pattOctaDown(bool sampleAllFlag)
{
	bool noteDeleted;
	int8_t k;
	note_t *noteSrc;

	saveUndo();
	for (uint8_t i = 0; i < AMIGA_VOICES; i++)
	{
		for (uint8_t j = 0; j < MOD_ROWS; j++)
		{
			noteSrc = &song->patterns[song->currPattern][(j * AMIGA_VOICES) + i];

			if (!sampleAllFlag && noteSrc->sample != editor.currSample+1)
				continue;

			if (noteSrc->period)
			{
				// period -> note
				for (k = 0; k < 36; k++)
				{
					if (noteSrc->period >= periodTable[k])
						break;
				}

				noteDeleted = false;
				if (k-12 < 0 && config.transDel)
				{
					noteSrc->period = 0;
					noteSrc->sample = 0;

					noteDeleted = true;
				}

				if (k >= 12)
					k -= 12;

				if (!noteDeleted)
					noteSrc->period = periodTable[k];
			}
		}
	}

	updateWindowTitle(MOD_IS_MODIFIED);
	ui.updatePatternData = true;
}

int8_t keyToNote(SDL_Scancode scancode)
{
	int8_t note;
	int32_t lookUpKey;

	if (scancode < SDL_SCANCODE_B || scancode > SDL_SCANCODE_SLASH)
		return -1; // not a note key

	lookUpKey = (int32_t)scancode - SDL_SCANCODE_B;
	if (lookUpKey < 0 || lookUpKey >= 52)
		return -1; // just in case

	if (editor.keyOctave == OCTAVE_LOW)
		note = scancode2NoteLo[lookUpKey];
	else
		note = scancode2NoteHi[lookUpKey];

	return note;
}
