SubstituteEffect_: ; 17dad (5:7dad)
	ld c, 50
	call DelayFrames
	ld hl, wBattleMonMaxHP
	ld de, wPlayerSubstituteHP
	ld bc, W_PLAYERBATTSTATUS2
	ld a, [H_WHOSETURN]
	and a
	jr z, .notEnemy
	ld hl, wEnemyMonMaxHP
	ld de, wEnemySubstituteHP
	ld bc, W_ENEMYBATTSTATUS2
.notEnemy
	ld a, [bc] 
	bit HasSubstituteUp, a ; user already has substitute?
	jr nz, .alreadyHasSubstitute 
; quarter health to remove from user
; assumes max HP is 1023 or lower	
	push bc
	ld a, [hli]
	ld b, [hl]
	srl a 
	rr b
	srl a
	rr b ; max hp / 4
	push de
	ld de, wBattleMonHP - wBattleMonMaxHP
	add hl, de ; point hl to current HP low byte
	pop de
	ld a, b 
	ld [de], a ; save copy of HP to subtract in ccd7/ccd8 [how much HP substitute has]
	ld a, [hld]
; subtract [max hp / 4] to current HP	
	sub b 
	ld d, a
	ld a, [hl]
	sbc 0 
	pop bc
	jr c, .notEnoughHP ; underflow means user would be left with negative health
                           ; bug: since it only brances on carry, it will possibly leave user with 0 HP
.userHasZeroOrMoreHP
	ldi [hl], a ; save resulting HP after substraction into current HP
	ld [hl], d   
	ld h, b
	ld l, c
	set HasSubstituteUp, [hl] 
	ld a, [W_OPTIONS]         
	bit 7, a ; battle animation is enabled?
	ld hl, PlayCurrentMoveAnimation         
	ld b, BANK(PlayCurrentMoveAnimation)
	jr z, .animationEnabled
	ld hl, AnimationSubstitute 
	ld b, BANK(AnimationSubstitute)
.animationEnabled
	call Bankswitch ; jump to routine depending on animation setting
	ld hl, SubstituteText
	call PrintText
	ld hl, DrawHUDsAndHPBars
	ld b, BANK(DrawHUDsAndHPBars)
	jp Bankswitch
.alreadyHasSubstitute
	ld hl, HasSubstituteText
	jr .printText
.notEnoughHP
	ld hl, TooWeakSubstituteText
.printText
	jp PrintText

SubstituteText: ; 17e1d (5:7e1d)
	TX_FAR _SubstituteText
	db "@"

HasSubstituteText: ; 17e22 (5:7e22)
	TX_FAR _HasSubstituteText
	db "@"

TooWeakSubstituteText: ; 17e27 (5:7e27)
	TX_FAR _TooWeakSubstituteText
	db "@"