ref: bcfca2e267a6ee023271d90e27e4a7fde06f66fc
dir: /engine/battle/moveEffects/substitute_effect.asm/
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 "@"