pokecrystal-board/engine/items/tmhm.asm

TMHMPocket:
	ld a, $1
	ldh [hInMenu], a
	call TMHM_PocketLoop
	ld a, $0
	ldh [hInMenu], a
	ret nc
	call PlaceHollowCursor
	call WaitBGMap
	ld a, [wCurItem]
	dec a
	ld [wCurItemQuantity], a
	ld hl, wTMsHMs
	ld c, a
	ld b, 0
	add hl, bc
	ld a, [hl]
	ld [wItemQuantity], a
	call .ConvertItemToTMHMNumber
	scf
	ret

.ConvertItemToTMHMNumber:
	ld a, [wCurItem]
	ld c, a
	callfar GetNumberedTMHM
	ld a, c
	ld [wCurItem], a
	ret

ConvertCurItemIntoCurTMHM:
	ld a, [wCurItem]
	ld c, a
	callfar GetTMHMNumber
	ld a, c
	ld [wTempTMHM], a
	ret

GetTMHMItemMove:
	call ConvertCurItemIntoCurTMHM
	predef GetTMHMMove
	ret

AskTeachTMHM:
	ld hl, wOptions
	ld a, [hl]
	push af
	res NO_TEXT_SCROLL, [hl]
	ld a, [wCurItem]
	cp TM01
	jr c, .NotTMHM
	call GetTMHMItemMove
	ld a, [wTempTMHM]
	ld [wPutativeTMHMMove], a
	call GetMoveName
	call CopyName1
	ld hl, BootedTMText ; Booted up a TM
	ld a, [wCurItem]
	cp HM01
	jr c, .TM
	ld hl, BootedHMText ; Booted up an HM
.TM:
	call PrintText1bpp
	ld hl, ContainedMoveText
	call PrintText1bpp
	call YesNoBox
.NotTMHM:
	pop bc
	ld a, b
	ld [wOptions], a
	ret

ChooseMonToLearnTMHM:
	call ClearBGPalettes
ChooseMonToLearnTMHM_NoRefresh:
	farcall LoadPartyMenuGFX
	farcall InitPartyMenuWithCancel
	farcall InitPartyMenuGFX
	ld a, PARTYMENUACTION_TEACH_TMHM
	ld [wPartyMenuActionText], a
.loopback
	farcall WritePartyMenuTilemap
	farcall PlacePartyMenuText
	call WaitBGMap
	call SetDefaultBGPAndOBP
	call DelayFrame
	farcall PartyMenuSelect
	push af
	ld a, [wCurPartySpecies]
	cp EGG
	pop bc ; now contains the former contents of af
	jr z, .egg
	push bc
	pop af ; now contains the original contents of af
	ret

.egg
	push hl
	push de
	push bc
	push af
	ld de, SFX_WRONG
	call PlaySFX
	call WaitSFX
	pop af
	pop bc
	pop de
	pop hl
	jr .loopback

TeachTMHM:
	predef CanLearnTMHMMove

	push bc
	ld a, [wCurPartyMon]
	ld hl, wPartyMonNicknames
	call GetNickname
	pop bc

	ld a, c
	and a
	jr nz, .compatible
	push de
	ld de, SFX_WRONG
	call PlaySFX
	pop de
	ld hl, TMHMNotCompatibleText
	call PrintText1bpp
	jr .nope

.compatible
	callfar KnowsMove
	jr c, .nope

	predef LearnMove
	ld a, b
	and a
	jr z, .nope

	ld a, [wCurItem]
	call IsHM
	ret c

	ld c, HAPPINESS_LEARNMOVE
	callfar ChangeHappiness
	call ConsumeTM
	jr .learned_move

.nope
	and a
	ret

.didnt_use ; unreferenced
	ld a, 2
	ld [wItemEffectSucceeded], a
.learned_move
	scf
	ret

BootedTMText:
	text_far _BootedTMText
	text_end

BootedHMText:
	text_far _BootedHMText
	text_end

ContainedMoveText:
	text_far _ContainedMoveText
	text_end

TMHMNotCompatibleText:
	text_far _TMHMNotCompatibleText
	text_end

TMHM_PocketLoop:
	xor a
	ldh [hBGMapMode], a
	call TMHM_DisplayPocketItems
	ld a, 2
	ld [w2DMenuCursorInitY], a
	ld a, 7
	ld [w2DMenuCursorInitX], a
	ld a, 1
	ld [w2DMenuNumCols], a
	ld a, 5
	sub d
	inc a
	cp 6
	jr nz, .okay
	dec a
.okay
	ld [w2DMenuNumRows], a
	ld a, $c
	ld [w2DMenuFlags1], a
	xor a
	ld [w2DMenuFlags2], a
	ld a, $20
	ld [w2DMenuCursorOffsets], a
	ld a, A_BUTTON | B_BUTTON | D_UP | D_DOWN | D_LEFT | D_RIGHT
	ld [wMenuJoypadFilter], a
	ld a, [wTMHMPocketCursor]
	inc a
	ld [wMenuCursorY], a
	ld a, $1
	ld [wMenuCursorX], a
	jr TMHM_ShowTMMoveDescription

TMHM_JoypadLoop:
	call TMHM_DisplayPocketItems
	call StaticMenuJoypad
	ld b, a
	ld a, [wMenuCursorY]
	dec a
	ld [wTMHMPocketCursor], a
	xor a
	ldh [hBGMapMode], a
	ld a, [w2DMenuFlags2]
	bit 7, a
	jp nz, TMHM_ScrollPocket
	ld a, b
	ld [wMenuJoypad], a
	bit A_BUTTON_F, a
	jp nz, TMHM_ChooseTMorHM
	bit B_BUTTON_F, a
	jp nz, TMHM_ExitPack
	bit D_RIGHT_F, a
	jp nz, TMHM_ExitPocket
	bit D_LEFT_F, a
	jp nz, TMHM_ExitPocket
TMHM_ShowTMMoveDescription:
	call TMHM_CheckHoveringOverCancel
	jp nc, TMHM_ExitPocket
	hlcoord 0, 12
	ld b, 4
	ld c, SCREEN_WIDTH - 2
	call Textbox1bpp
	ld a, [wCurItem]
	cp NUM_TMS + NUM_HMS + 1
	jr nc, TMHM_JoypadLoop
	ld [wTempTMHM], a
	predef GetTMHMMove
	ld a, [wTempTMHM]
	ld [wCurSpecies], a
	hlcoord 1, 14
	call PrintMoveDescription
	jp TMHM_JoypadLoop

TMHM_ChooseTMorHM:
	call TMHM_PlaySFX_ReadText2
	call CountTMsHMs ; This stores the count to wTempTMHM.
	ld a, [wMenuCursorY]
	dec a
	ld b, a
	ld a, [wTMHMPocketScrollPosition]
	add b
	ld b, a
	ld a, [wTempTMHM]
	cp b
	jr z, _TMHM_ExitPack ; our cursor was hovering over CANCEL
TMHM_CheckHoveringOverCancel:
	call TMHM_GetCurrentPocketPosition
	ld a, [wMenuCursorY]
	ld b, a
.loop
	inc c
	ld a, c
	cp NUM_TMS + NUM_HMS + 1
	jr nc, .okay
	ld a, [hli]
	and a
	jr z, .loop
	dec b
	jr nz, .loop
	ld a, c
.okay
	ld [wCurItem], a
	cp -1
	ret

TMHM_ExitPack:
	call TMHM_PlaySFX_ReadText2
_TMHM_ExitPack:
	ld a, B_BUTTON
	ld [wMenuJoypad], a
	and a
	ret

TMHM_ExitPocket:
	and a
	ret

TMHM_ScrollPocket:
	ld a, b
	bit 7, a
	jr nz, .skip
	ld hl, wTMHMPocketScrollPosition
	ld a, [hl]
	and a
	jp z, TMHM_JoypadLoop
	dec [hl]
	call TMHM_DisplayPocketItems
	jp TMHM_ShowTMMoveDescription

.skip
	call TMHM_GetCurrentPocketPosition
	ld b, 5
.loop
	inc c
	ld a, c
	cp NUM_TMS + NUM_HMS + 1
	jp nc, TMHM_JoypadLoop
	ld a, [hli]
	and a
	jr z, .loop
	dec b
	jr nz, .loop
	ld hl, wTMHMPocketScrollPosition
	inc [hl]
	call TMHM_DisplayPocketItems
	jp TMHM_ShowTMMoveDescription

TMHM_DisplayPocketItems:
	ld a, [wBattleType]
	cp BATTLETYPE_TUTORIAL
	jp z, Tutorial_TMHMPocket

	hlcoord 5, 2
	lb bc, 10, 15
	ld a, " "
	call ClearBox
	call TMHM_GetCurrentPocketPosition
	ld d, $5
.loop2
	inc c
	ld a, c
	cp NUM_TMS + NUM_HMS + 1
	jr nc, .NotTMHM
	ld a, [hli]
	and a
	jr z, .loop2
	ld b, a
	ld a, c
	ld [wTempTMHM], a
	push hl
	push de
	push bc
	call TMHMPocket_GetCurrentLineCoord
	push hl
	ld a, [wTempTMHM]
	cp NUM_TMS + 1
	jr nc, .HM
	ld de, wTempTMHM
	lb bc, PRINTNUM_LEADINGZEROS | 1, 2
	call PrintNum
	jr .okay

.HM:
	push af
	sub NUM_TMS
	ld [wTempTMHM], a
	ld [hl], "H"
	inc hl
	ld de, wTempTMHM
	lb bc, PRINTNUM_LEFTALIGN | 1, 2
	call PrintNum
	pop af
	ld [wTempTMHM], a
.okay
	predef GetTMHMMove
	ld a, [wNamedObjectIndex]
	ld [wPutativeTMHMMove], a
	call GetMoveName
	pop hl
	ld bc, 3
	add hl, bc
	push hl
	call PlaceString
	pop hl
	pop bc
	ld a, c
	push bc
	cp NUM_TMS + 1
	jr nc, .hm2
	ld bc, SCREEN_WIDTH + 9
	add hl, bc
	ld [hl], "×"
	inc hl
	ld a, "0" ; why are we doing this?
	pop bc
	push bc
	ld a, b
	ld [wTempTMHM], a
	ld de, wTempTMHM
	lb bc, 1, 2
	call PrintNum
.hm2
	pop bc
	pop de
	pop hl
	dec d
	jr nz, .loop2
	jr .done

.NotTMHM:
	call TMHMPocket_GetCurrentLineCoord
	inc hl
	inc hl
	inc hl
	push de
	ld de, TMHM_CancelString
	call PlaceString
	pop de
.done
	ret

TMHMPocket_GetCurrentLineCoord:
	hlcoord 5, 0
	ld bc, 2 * SCREEN_WIDTH
	ld a, 6
	sub d
	ld e, a
	; AddNTimes
.loop
	add hl, bc
	dec e
	jr nz, .loop
	ret

PlaceMoveNameAfterTMHMName: ; unreferenced
; Similar to a part of TMHM_DisplayPocketItems.
	pop hl
	ld bc, 3
	add hl, bc
	predef GetTMHMMove
	ld a, [wTempTMHM]
	ld [wPutativeTMHMMove], a
	call GetMoveName
	push hl
	call PlaceString
	pop hl
	ret

TMHM_CancelString:
	db "CANCEL@"

TMHM_GetCurrentPocketPosition:
	ld hl, wTMsHMs
	ld a, [wTMHMPocketScrollPosition]
	ld b, a
	inc b
	ld c, 0
.loop
	inc c
	ld a, [hli]
	and a
	jr z, .loop
	dec b
	jr nz, .loop
	dec hl
	dec c
	ret

Tutorial_TMHMPocket:
	hlcoord 9, 3
	push de
	ld de, TMHM_CancelString
	call PlaceString
	pop de
	ret

TMHM_PlaySFX_ReadText2:
	push de
	ld de, SFX_READ_TEXT_2
	call PlaySFX
	pop de
	ret

VerboseReceiveTMHM: ; unreferenced
	call ConvertCurItemIntoCurTMHM
	call .CheckHaveRoomForTMHM
	ld hl, .NoRoomTMHMText
	jr nc, .print
	ld hl, .ReceivedTMHMText
.print
	jp PrintText1bpp

.NoRoomTMHMText:
	text_far _NoRoomTMHMText
	text_end

.ReceivedTMHMText:
	text_far _ReceivedTMHMText
	text_end

.CheckHaveRoomForTMHM:
	ld a, [wTempTMHM]
	dec a
	ld hl, wTMsHMs
	ld b, 0
	ld c, a
	add hl, bc
	ld a, [hl]
	inc a
	cp MAX_ITEM_STACK + 1
	ret nc
	ld [hl], a
	ret

ConsumeTM:
	call ConvertCurItemIntoCurTMHM
	ld a, [wTempTMHM]
	dec a
	ld hl, wTMsHMs
	ld b, 0
	ld c, a
	add hl, bc
	ld a, [hl]
	and a
	ret z
	dec a
	ld [hl], a
	ret nz
	ld a, [wTMHMPocketScrollPosition]
	and a
	ret z
	dec a
	ld [wTMHMPocketScrollPosition], a
	ret

CountTMsHMs:
	ld b, 0
	ld c, NUM_TMS + NUM_HMS
	ld hl, wTMsHMs
.loop
	ld a, [hli]
	and a
	jr z, .skip
	inc b
.skip
	dec c
	jr nz, .loop
	ld a, b
	ld [wTempTMHM], a
	ret