ref: c9946975d4cd806c92c1aa1efef94eb41d8b9d36
dir: /engine/battle/5.asm/
SubstituteEffectHandler: ; 17dad (5:7dad)
ld c, 50
call DelayFrames
ld hl, wBattleMonMaxHP
ld de, wPlayerSubstituteHP
ld bc, W_PLAYERBATTSTATUS2
ld a, [$fff3] ;whose turn?
and a
jr z, .notEnemy
ld hl, wEnemyMonMaxHP
ld de, wEnemySubstituteHP
ld bc, W_ENEMYBATTSTATUS2
.notEnemy
ld a, [bc] ;load flags
bit 4, a ;user already has substitute?
jr nz, .alreadyHasSubstitute ;skip this code if so
;user doesn't have a substitute [yet]
push bc
ld a, [hli] ;load max hp
ld b, [hl]
srl a ;max hp / 4, [quarter health to remove from user]
rr b
srl a
rr b
push de
ld de, $fff2 ;subtract 8 to point to [current hp] instead of [max hp]
add hl, de ;HL -= 8
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] ;load current hp
sub b ;subtract [max hp / 4]
ld d, a ;save low byte result in D
ld a, [hl]
sbc a, 0 ;borrow from high byte if needed
pop bc
jr c, .notEnoughHP ;underflow means user would be left with negative health
;bug: note since it only brances on carry, it will possibly leave user with 0HP
.userHasZeroOrMoreHP
ldi [hl], a ;store high byte HP
ld [hl], d ;store low byte HP
ld h, b
ld l, c
set 4, [hl] ;set bit 4 of flags, user now has substitute
ld a, [W_OPTIONS] ;load options
bit 7, a ;battle animation is enabled?
ld hl, Func_3fba8 ; $7ba8 ;animation enabled: 0F:7BA8
ld b, BANK(Func_3fba8)
jr z, .animationEnabled
ld hl, AnimationSubstitute ;animation disabled: 1E:56E0
ld b, BANK(AnimationSubstitute)
.animationEnabled
call Bankswitch ;jump to routine depending on animation setting
ld hl, SubstituteText
call PrintText
ld hl, Func_3cd5a
ld b, BANK(Func_3cd5a)
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 "@"