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Upload literally everything from the pokecrystal16 expand-move-ID branch

engine/battle/ai/items.asm

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+AI_SwitchOrTryItem:
+	and a
+
+	ld a, [wBattleMode]
+	dec a
+	ret z
+
+	ld a, [wLinkMode]
+	and a
+	ret nz
+
+	farcall CheckEnemyLockedIn
+	ret nz
+
+	ld a, [wPlayerSubStatus5]
+	bit SUBSTATUS_CANT_RUN, a
+	jr nz, DontSwitch
+
+	ld a, [wEnemyWrapCount]
+	and a
+	jr nz, DontSwitch
+
+	; always load the first trainer class in wTrainerClass for Battle Tower trainers
+	ld hl, TrainerClassAttributes + TRNATTR_AI_ITEM_SWITCH
+	ld a, [wInBattleTowerBattle]
+	and a
+	jr nz, .ok
+
+	ld a, [wTrainerClass]
+	dec a
+	ld bc, NUM_TRAINER_ATTRIBUTES
+	call AddNTimes
+
+.ok
+	bit SWITCH_OFTEN_F, [hl]
+	jp nz, SwitchOften
+	bit SWITCH_RARELY_F, [hl]
+	jp nz, SwitchRarely
+	bit SWITCH_SOMETIMES_F, [hl]
+	jp nz, SwitchSometimes
+	; fallthrough
+
+DontSwitch:
+	call AI_TryItem
+	ret
+
+SwitchOften:
+	callfar CheckAbleToSwitch
+	ld a, [wEnemySwitchMonParam]
+	and $f0
+	jp z, DontSwitch
+
+	cp $10
+	jr nz, .not_10
+	call Random
+	cp 50 percent + 1
+	jr c, .switch
+	jp DontSwitch
+.not_10
+
+	cp $20
+	jr nz, .not_20
+	call Random
+	cp 79 percent - 1
+	jr c, .switch
+	jp DontSwitch
+.not_20
+
+	; $30
+	call Random
+	cp 4 percent
+	jp c, DontSwitch
+
+.switch
+	ld a, [wEnemySwitchMonParam]
+	and $f
+	inc a
+	; In register 'a' is the number (1-6) of the mon to switch to
+	ld [wEnemySwitchMonIndex], a
+	jp AI_TrySwitch
+
+SwitchRarely:
+	callfar CheckAbleToSwitch
+	ld a, [wEnemySwitchMonParam]
+	and $f0
+	jp z, DontSwitch
+
+	cp $10
+	jr nz, .not_10
+	call Random
+	cp 8 percent
+	jr c, .switch
+	jp DontSwitch
+.not_10
+
+	cp $20
+	jr nz, .not_20
+	call Random
+	cp 12 percent
+	jr c, .switch
+	jp DontSwitch
+.not_20
+
+	; $30
+	call Random
+	cp 79 percent - 1
+	jp c, DontSwitch
+
+.switch
+	ld a, [wEnemySwitchMonParam]
+	and $f
+	inc a
+	ld [wEnemySwitchMonIndex], a
+	jp AI_TrySwitch
+
+SwitchSometimes:
+	callfar CheckAbleToSwitch
+	ld a, [wEnemySwitchMonParam]
+	and $f0
+	jp z, DontSwitch
+
+	cp $10
+	jr nz, .not_10
+	call Random
+	cp 20 percent - 1
+	jr c, .switch
+	jp DontSwitch
+.not_10
+
+	cp $20
+	jr nz, .not_20
+	call Random
+	cp 50 percent + 1
+	jr c, .switch
+	jp DontSwitch
+.not_20
+
+	; $30
+	call Random
+	cp 20 percent - 1
+	jp c, DontSwitch
+
+.switch
+	ld a, [wEnemySwitchMonParam]
+	and $f
+	inc a
+	ld [wEnemySwitchMonIndex], a
+	jp AI_TrySwitch
+
+CheckSubstatusCantRun: ; unreferenced
+	ld a, [wEnemySubStatus5]
+	bit SUBSTATUS_CANT_RUN, a
+	ret
+
+AI_TryItem:
+	; items are not allowed in the Battle Tower
+	ld a, [wInBattleTowerBattle]
+	and a
+	ret nz
+
+	ld a, [wEnemyTrainerItem1]
+	ld b, a
+	ld a, [wEnemyTrainerItem2]
+	or b
+	ret z
+
+	call .IsHighestLevel
+	ret nc
+
+	ld a, [wTrainerClass]
+	dec a
+	ld hl, TrainerClassAttributes + TRNATTR_AI_ITEM_SWITCH
+	ld bc, NUM_TRAINER_ATTRIBUTES
+	call AddNTimes
+	ld b, h
+	ld c, l
+	ld hl, AI_Items
+	ld de, wEnemyTrainerItem1
+.loop
+	ld a, [hl]
+	and a
+	inc a
+	ret z
+
+	ld a, [de]
+	cp [hl]
+	jr z, .has_item
+	inc de
+	ld a, [de]
+	cp [hl]
+	jr z, .has_item
+
+	dec de
+	inc hl
+	inc hl
+	inc hl
+	jr .loop
+
+.has_item
+	inc hl
+
+	push hl
+	push de
+	ld de, .callback
+	push de
+	ld a, [hli]
+	ld h, [hl]
+	ld l, a
+	jp hl
+.callback
+	pop de
+	pop hl
+
+	inc hl
+	inc hl
+	jr c, .loop
+
+; used item
+	xor a
+	ld [de], a
+	inc a
+	ld [wEnemyGoesFirst], a
+
+	ld hl, wEnemySubStatus3
+	res SUBSTATUS_BIDE, [hl]
+
+	xor a
+	ld [wEnemyFuryCutterCount], a
+	ld [wEnemyProtectCount], a
+	ld [wEnemyRageCounter], a
+
+	ld hl, wEnemySubStatus4
+	res SUBSTATUS_RAGE, [hl]
+
+	xor a
+	ld [wLastEnemyCounterMove], a
+
+	scf
+	ret
+
+.IsHighestLevel:
+	ld a, [wOTPartyCount]
+	ld d, a
+	ld e, 0
+	ld hl, wOTPartyMon1Level
+	ld bc, PARTYMON_STRUCT_LENGTH
+.next
+	ld a, [hl]
+	cp e
+	jr c, .ok
+	ld e, a
+.ok
+	add hl, bc
+	dec d
+	jr nz, .next
+
+	ld a, [wCurOTMon]
+	ld hl, wOTPartyMon1Level
+	call AddNTimes
+	ld a, [hl]
+	cp e
+	jr nc, .yes
+
+.no ; unreferenced
+	and a
+	ret
+
+.yes
+	scf
+	ret
+
+AI_Items:
+	dbw FULL_RESTORE, .FullRestore
+	dbw MAX_POTION,   .MaxPotion
+	dbw HYPER_POTION, .HyperPotion
+	dbw SUPER_POTION, .SuperPotion
+	dbw POTION,       .Potion
+	dbw X_ACCURACY,   .XAccuracy
+	dbw FULL_HEAL,    .FullHeal
+	dbw GUARD_SPEC,   .GuardSpec
+	dbw DIRE_HIT,     .DireHit
+	dbw X_ATTACK,     .XAttack
+	dbw X_DEFEND,     .XDefend
+	dbw X_SPEED,      .XSpeed
+	dbw X_SPECIAL,    .XSpecial
+	db -1 ; end
+
+.FullHeal:
+	call .Status
+	jp c, .DontUse
+	call EnemyUsedFullHeal
+	jp .Use
+
+.Status:
+	ld a, [wEnemyMonStatus]
+	and a
+	jp z, .DontUse
+
+	ld a, [bc]
+	bit CONTEXT_USE_F, a
+	jr nz, .StatusCheckContext
+	ld a, [bc]
+	bit ALWAYS_USE_F, a
+	jp nz, .Use
+	call Random
+	cp 20 percent - 1
+	jp c, .Use
+	jp .DontUse
+
+.StatusCheckContext:
+	ld a, [wEnemySubStatus5]
+	bit SUBSTATUS_TOXIC, a
+	jr z, .FailToxicCheck
+	ld a, [wEnemyToxicCount]
+	cp 4
+	jr c, .FailToxicCheck
+	call Random
+	cp 50 percent + 1
+	jp c, .Use
+.FailToxicCheck:
+	ld a, [wEnemyMonStatus]
+	and 1 << FRZ | SLP_MASK
+	jp z, .DontUse
+	jp .Use
+
+.FullRestore:
+	call .HealItem
+	jp nc, .UseFullRestore
+	ld a, [bc]
+	bit CONTEXT_USE_F, a
+	jp z, .DontUse
+	call .Status
+	jp c, .DontUse
+
+.UseFullRestore:
+	call EnemyUsedFullRestore
+	jp .Use
+
+.MaxPotion:
+	call .HealItem
+	jp c, .DontUse
+	call EnemyUsedMaxPotion
+	jp .Use
+
+.HealItem:
+	ld a, [bc]
+	bit CONTEXT_USE_F, a
+	jr nz, .CheckHalfOrQuarterHP
+	callfar AICheckEnemyHalfHP
+	jp c, .DontUse
+	ld a, [bc]
+	bit UNKNOWN_USE_F, a
+	jp nz, .CheckQuarterHP
+	callfar AICheckEnemyQuarterHP
+	jp nc, .UseHealItem
+	call Random
+	cp 50 percent + 1
+	jp c, .UseHealItem
+	jp .DontUse
+
+.CheckQuarterHP:
+	callfar AICheckEnemyQuarterHP
+	jp c, .DontUse
+	call Random
+	cp 20 percent - 1
+	jp c, .DontUse
+	jr .UseHealItem
+
+.CheckHalfOrQuarterHP:
+	callfar AICheckEnemyHalfHP
+	jp c, .DontUse
+	callfar AICheckEnemyQuarterHP
+	jp nc, .UseHealItem
+	call Random
+	cp 20 percent - 1
+	jp nc, .DontUse
+
+.UseHealItem:
+	jp .Use
+
+.HyperPotion:
+	call .HealItem
+	jp c, .DontUse
+	ld b, 200
+	call EnemyUsedHyperPotion
+	jp .Use
+
+.SuperPotion:
+	call .HealItem
+	jp c, .DontUse
+	ld b, 50
+	call EnemyUsedSuperPotion
+	jp .Use
+
+.Potion:
+	call .HealItem
+	jp c, .DontUse
+	ld b, 20
+	call EnemyUsedPotion
+	jp .Use
+
+; Everything up to "End unused" is unused
+
+.UnusedHealItem: ; unreferenced
+; This has similar conditions to .HealItem
+	callfar AICheckEnemyMaxHP
+	jr c, .dont_use
+	push bc
+	ld de, wEnemyMonMaxHP + 1
+	ld hl, wEnemyMonHP + 1
+	ld a, [de]
+	sub [hl]
+	jr z, .check_40_percent
+	dec hl
+	dec de
+	ld c, a
+	sbc [hl]
+	and a
+	jr nz, .check_40_percent
+	ld a, c
+	cp b
+	jp c, .check_50_percent
+	callfar AICheckEnemyQuarterHP
+	jr c, .check_40_percent
+
+.check_50_percent
+	pop bc
+	ld a, [bc]
+	bit UNKNOWN_USE_F, a
+	jp z, .Use
+	call Random
+	cp 50 percent + 1
+	jp c, .Use
+
+.dont_use
+	jp .DontUse
+
+.check_40_percent
+	pop bc
+	ld a, [bc]
+	bit UNKNOWN_USE_F, a
+	jp z, .DontUse
+	call Random
+	cp 39 percent + 1
+	jp c, .Use
+	jp .DontUse
+
+; End unused
+
+.XAccuracy:
+	call .XItem
+	jp c, .DontUse
+	call EnemyUsedXAccuracy
+	jp .Use
+
+.GuardSpec:
+	call .XItem
+	jp c, .DontUse
+	call EnemyUsedGuardSpec
+	jp .Use
+
+.DireHit:
+	call .XItem
+	jp c, .DontUse
+	call EnemyUsedDireHit
+	jp .Use
+
+.XAttack:
+	call .XItem
+	jp c, .DontUse
+	call EnemyUsedXAttack
+	jp .Use
+
+.XDefend:
+	call .XItem
+	jp c, .DontUse
+	call EnemyUsedXDefend
+	jp .Use
+
+.XSpeed:
+	call .XItem
+	jp c, .DontUse
+	call EnemyUsedXSpeed
+	jp .Use
+
+.XSpecial:
+	call .XItem
+	jp c, .DontUse
+	call EnemyUsedXSpecial
+	jp .Use
+
+.XItem:
+	ld a, [wEnemyTurnsTaken]
+	and a
+	jr nz, .notfirstturnout
+	ld a, [bc]
+	bit ALWAYS_USE_F, a
+	jp nz, .Use
+	call Random
+	cp 50 percent + 1
+	jp c, .DontUse
+	ld a, [bc]
+	bit CONTEXT_USE_F, a
+	jp nz, .Use
+	call Random
+	cp 50 percent + 1
+	jp c, .DontUse
+	jp .Use
+.notfirstturnout
+	ld a, [bc]
+	bit ALWAYS_USE_F, a
+	jp z, .DontUse
+	call Random
+	cp 20 percent - 1
+	jp nc, .DontUse
+	jp .Use
+
+.DontUse:
+	scf
+	ret
+
+.Use:
+	and a
+	ret
+
+AIUpdateHUD:
+	call UpdateEnemyMonInParty
+	farcall UpdateEnemyHUD
+	ld a, $1
+	ldh [hBGMapMode], a
+	ld hl, wEnemyItemState
+	dec [hl]
+	scf
+	ret
+
+AIUsedItemSound:
+	push de
+	ld de, SFX_FULL_HEAL
+	call PlaySFX
+	pop de
+	ret
+
+EnemyUsedFullHeal:
+	call AIUsedItemSound
+	call AI_HealStatus
+	ld a, FULL_HEAL
+	jp PrintText_UsedItemOn_AND_AIUpdateHUD
+
+EnemyUsedMaxPotion:
+	ld a, MAX_POTION
+	ld [wCurEnemyItem], a
+	jr FullRestoreContinue
+
+EnemyUsedFullRestore:
+; BUG: AI use of Full Heal does not cure confusion status (see docs/bugs_and_glitches.md)
+	call AI_HealStatus
+	ld a, FULL_RESTORE
+	ld [wCurEnemyItem], a
+	ld hl, wEnemySubStatus3
+	res SUBSTATUS_CONFUSED, [hl]
+	xor a
+	ld [wEnemyConfuseCount], a
+	; fallthrough
+
+FullRestoreContinue:
+	ld de, wCurHPAnimOldHP
+	ld hl, wEnemyMonHP + 1
+	ld a, [hld]
+	ld [de], a
+	inc de
+	ld a, [hl]
+	ld [de], a
+	inc de
+	ld hl, wEnemyMonMaxHP + 1
+	ld a, [hld]
+	ld [de], a
+	inc de
+	ld [wCurHPAnimMaxHP], a
+	ld [wEnemyMonHP + 1], a
+	ld a, [hl]
+	ld [de], a
+	ld [wCurHPAnimMaxHP + 1], a
+	ld [wEnemyMonHP], a
+	jr EnemyPotionFinish
+
+EnemyUsedPotion:
+	ld a, POTION
+	ld b, 20
+	jr EnemyPotionContinue
+
+EnemyUsedSuperPotion:
+	ld a, SUPER_POTION
+	ld b, 50
+	jr EnemyPotionContinue
+
+EnemyUsedHyperPotion:
+	ld a, HYPER_POTION
+	ld b, 200
+
+EnemyPotionContinue:
+	ld [wCurEnemyItem], a
+	ld hl, wEnemyMonHP + 1
+	ld a, [hl]
+	ld [wCurHPAnimOldHP], a
+	add b
+	ld [hld], a
+	ld [wCurHPAnimNewHP], a
+	ld a, [hl]
+	ld [wCurHPAnimOldHP + 1], a
+	ld [wCurHPAnimNewHP + 1], a
+	jr nc, .ok
+	inc a
+	ld [hl], a
+	ld [wCurHPAnimNewHP + 1], a
+.ok
+	inc hl
+	ld a, [hld]
+	ld b, a
+	ld de, wEnemyMonMaxHP + 1
+	ld a, [de]
+	dec de
+	ld [wCurHPAnimMaxHP], a
+	sub b
+	ld a, [hli]
+	ld b, a
+	ld a, [de]
+	ld [wCurHPAnimMaxHP + 1], a
+	sbc b
+	jr nc, EnemyPotionFinish
+	inc de
+	ld a, [de]
+	dec de
+	ld [hld], a
+	ld [wCurHPAnimNewHP], a
+	ld a, [de]
+	ld [hl], a
+	ld [wCurHPAnimNewHP + 1], a
+
+EnemyPotionFinish:
+	call PrintText_UsedItemOn
+	hlcoord 2, 2
+	xor a
+	ld [wWhichHPBar], a
+	call AIUsedItemSound
+	predef AnimateHPBar
+	jp AIUpdateHUD
+
+AI_TrySwitch:
+; Determine whether the AI can switch based on how many Pokemon are still alive.
+; If it can switch, it will.
+	ld a, [wOTPartyCount]
+	ld c, a
+	ld hl, wOTPartyMon1HP
+	ld d, 0
+.SwitchLoop:
+	ld a, [hli]
+	ld b, a
+	ld a, [hld]
+	or b
+	jr z, .fainted
+	inc d
+.fainted
+	push bc
+	ld bc, PARTYMON_STRUCT_LENGTH
+	add hl, bc
+	pop bc
+	dec c
+	jr nz, .SwitchLoop
+
+	ld a, d
+	cp 2
+	jp nc, AI_Switch
+	and a
+	ret
+
+AI_Switch:
+	ld a, $1
+	ld [wEnemyIsSwitching], a
+	ld [wEnemyGoesFirst], a
+	ld hl, wEnemySubStatus4
+	res SUBSTATUS_RAGE, [hl]
+	xor a
+	ldh [hBattleTurn], a
+	callfar PursuitSwitch
+
+	push af
+	ld a, [wCurOTMon]
+	ld hl, wOTPartyMon1Status
+	ld bc, PARTYMON_STRUCT_LENGTH
+	call AddNTimes
+	ld d, h
+	ld e, l
+	ld hl, wEnemyMonStatus
+	ld bc, MON_MAXHP - MON_STATUS
+	call CopyBytes
+	pop af
+
+	jr c, .skiptext
+	ld hl, EnemyWithdrewText
+	call PrintText
+
+.skiptext
+	ld a, 1
+	ld [wBattleHasJustStarted], a
+	callfar NewEnemyMonStatus
+	callfar ResetEnemyStatLevels
+	ld hl, wPlayerSubStatus1
+	res SUBSTATUS_IN_LOVE, [hl]
+	farcall EnemySwitch
+	farcall ResetBattleParticipants
+	xor a
+	ld [wBattleHasJustStarted], a
+	ld a, [wLinkMode]
+	and a
+	ret nz
+	scf
+	ret
+
+EnemyWithdrewText:
+	text_far _EnemyWithdrewText
+	text_end
+
+EnemyUsedFullHealRed: ; unreferenced
+	call AIUsedItemSound
+	call AI_HealStatus
+	ld a, FULL_HEAL_RED ; X_SPEED
+	jp PrintText_UsedItemOn_AND_AIUpdateHUD
+
+AI_HealStatus:
+; BUG: AI use of Full Heal or Full Restore does not cure Nightmare status (see docs/bugs_and_glitches.md)
+	ld a, [wCurOTMon]
+	ld hl, wOTPartyMon1Status
+	ld bc, PARTYMON_STRUCT_LENGTH
+	call AddNTimes
+	xor a
+	ld [hl], a
+	ld [wEnemyMonStatus], a
+	ld hl, wEnemySubStatus5
+	res SUBSTATUS_TOXIC, [hl]
+	ret
+
+EnemyUsedXAccuracy:
+	call AIUsedItemSound
+	ld hl, wEnemySubStatus4
+	set SUBSTATUS_X_ACCURACY, [hl]
+	ld a, X_ACCURACY
+	jp PrintText_UsedItemOn_AND_AIUpdateHUD
+
+EnemyUsedGuardSpec:
+	call AIUsedItemSound
+	ld hl, wEnemySubStatus4
+	set SUBSTATUS_MIST, [hl]
+	ld a, GUARD_SPEC
+	jp PrintText_UsedItemOn_AND_AIUpdateHUD
+
+EnemyUsedDireHit:
+	call AIUsedItemSound
+	ld hl, wEnemySubStatus4
+	set SUBSTATUS_FOCUS_ENERGY, [hl]
+	ld a, DIRE_HIT
+	jp PrintText_UsedItemOn_AND_AIUpdateHUD
+
+AICheckEnemyFractionMaxHP: ; unreferenced
+; Input: a = divisor
+; Work: bc = [wEnemyMonMaxHP] / a
+; Work: de = [wEnemyMonHP]
+; Output:
+; -  c, nz if [wEnemyMonHP] > [wEnemyMonMaxHP] / a
+; - nc,  z if [wEnemyMonHP] = [wEnemyMonMaxHP] / a
+; - nc, nz if [wEnemyMonHP] < [wEnemyMonMaxHP] / a
+	ldh [hDivisor], a
+	ld hl, wEnemyMonMaxHP
+	ld a, [hli]
+	ldh [hDividend], a
+	ld a, [hl]
+	ldh [hDividend + 1], a
+	ld b, 2
+	call Divide
+	ldh a, [hQuotient + 3]
+	ld c, a
+	ldh a, [hQuotient + 2]
+	ld b, a
+	ld hl, wEnemyMonHP + 1
+	ld a, [hld]
+	ld e, a
+	ld a, [hl]
+	ld d, a
+	ld a, d
+	sub b
+	ret nz
+	ld a, e
+	sub c
+	ret
+
+EnemyUsedXAttack:
+	ld b, ATTACK
+	ld a, X_ATTACK
+	jr EnemyUsedXItem
+
+EnemyUsedXDefend:
+	ld b, DEFENSE
+	ld a, X_DEFEND
+	jr EnemyUsedXItem
+
+EnemyUsedXSpeed:
+	ld b, SPEED
+	ld a, X_SPEED
+	jr EnemyUsedXItem
+
+EnemyUsedXSpecial:
+	ld b, SP_ATTACK
+	ld a, X_SPECIAL
+
+; Parameter
+; a = ITEM_CONSTANT
+; b = BATTLE_CONSTANT (ATTACK, DEFENSE, SPEED, SP_ATTACK, SP_DEFENSE, ACCURACY, EVASION)
+EnemyUsedXItem:
+	ld [wCurEnemyItem], a
+	push bc
+	call PrintText_UsedItemOn
+	pop bc
+	farcall RaiseStat
+	jp AIUpdateHUD
+
+; Parameter
+; a = ITEM_CONSTANT
+PrintText_UsedItemOn_AND_AIUpdateHUD:
+	ld [wCurEnemyItem], a
+	call PrintText_UsedItemOn
+	jp AIUpdateHUD
+
+PrintText_UsedItemOn:
+	ld a, [wCurEnemyItem]
+	ld [wNamedObjectIndex], a
+	call GetItemName
+	ld hl, wStringBuffer1
+	ld de, wMonOrItemNameBuffer
+	ld bc, ITEM_NAME_LENGTH
+	call CopyBytes
+	ld hl, EnemyUsedOnText
+	jp PrintText
+
+EnemyUsedOnText:
+	text_far _EnemyUsedOnText
+	text_end