mirror of https://github.com/pret/pokecrystal.git
162 lines
2.9 KiB
NASM
162 lines
2.9 KiB
NASM
GivePokerusAndConvertBerries:
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call ConvertBerriesToBerryJuice
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ld hl, wPartyMon1PokerusStatus
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ld a, [wPartyCount]
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ld b, a
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ld de, PARTYMON_STRUCT_LENGTH
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; Check to see if any of your Pokemon already has Pokerus.
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; If so, sample its spread through your party.
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; This means that you cannot get Pokerus de novo while
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; a party member has an active infection.
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.loopMons
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ld a, [hl]
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and $f
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jr nz, .TrySpreadPokerus
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add hl, de
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dec b
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jr nz, .loopMons
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; If we haven't been to Goldenrod City at least once,
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; prevent the contraction of Pokerus.
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ld hl, wStatusFlags2
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bit STATUSFLAGS2_REACHED_GOLDENROD_F, [hl]
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ret z
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call Random
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ld a, [hRandomAdd]
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and a
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ret nz
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ld a, [hRandomSub]
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cp $3
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ret nc ; 3/65536 chance (00 00, 00 01 or 00 02)
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ld a, [wPartyCount]
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ld b, a
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.randomMonSelectLoop
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call Random
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and $7
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cp b
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jr nc, .randomMonSelectLoop
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ld hl, wPartyMon1PokerusStatus
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call GetPartyLocation ; get pokerus byte of random mon
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ld a, [hl]
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and $f0
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ret nz ; if it already has pokerus, do nothing
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.randomPokerusLoop ; Simultaneously sample the strain and duration
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call Random
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and a
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jr z, .randomPokerusLoop
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ld b, a
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and $f0
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jr z, .load_pkrs
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ld a, b
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and $7
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inc a
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.load_pkrs
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ld b, a ; this should come before the label
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swap b
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and $3
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inc a
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add b
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ld [hl], a
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ret
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.TrySpreadPokerus:
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call Random
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cp 33 percent + 1
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ret nc ; 1/3 chance
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ld a, [wPartyCount]
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cp 1
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ret z ; only one mon, nothing to do
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ld c, [hl]
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ld a, b
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cp 2
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jr c, .checkPreviousMonsLoop ; no more mons after this one, go backwards
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call Random
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cp 50 percent + 1
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jr c, .checkPreviousMonsLoop ; 1/2 chance, go backwards
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.checkFollowingMonsLoop
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add hl, de
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ld a, [hl]
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and a
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jr z, .infectMon
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ld c, a
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and $3
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ret z ; if mon has cured pokerus, stop searching
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dec b ; go on to next mon
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ld a, b
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cp 1
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jr nz, .checkFollowingMonsLoop ; no more mons left
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ret
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.checkPreviousMonsLoop
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ld a, [wPartyCount]
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cp b
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ret z ; no more mons
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ld a, l
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sub e
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ld l, a
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ld a, h
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sbc d
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ld h, a
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ld a, [hl]
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and a
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jr z, .infectMon
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ld c, a
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and $3
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ret z ; if mon has cured pokerus, stop searching
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inc b ; go on to next mon
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jr .checkPreviousMonsLoop
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.infectMon
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ld a, c
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and $f0
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ld b, a
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ld a, c
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swap a
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and $3
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inc a
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add b
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ld [hl], a
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ret
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ConvertBerriesToBerryJuice:
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; If we haven't been to Goldenrod City at least once,
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; prevent Shuckle from turning held Berry into Berry Juice.
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ld hl, wStatusFlags2
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bit STATUSFLAGS2_REACHED_GOLDENROD_F, [hl]
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ret z
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call Random
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cp 6 percent + 1 ; 1/16 chance
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ret nc
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ld hl, wPartyMons
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ld a, [wPartyCount]
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.partyMonLoop
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push af
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push hl
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ld a, [hl]
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cp SHUCKLE
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jr nz, .loopMon
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ld bc, MON_ITEM
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add hl, bc
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ld a, [hl]
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cp BERRY
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jr z, .convertToJuice
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.loopMon
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pop hl
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ld bc, PARTYMON_STRUCT_LENGTH
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add hl, bc
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pop af
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dec a
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jr nz, .partyMonLoop
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ret
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.convertToJuice
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ld a, BERRY_JUICE
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ld [hl], a
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pop hl
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pop af
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ret
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