1 files changed, 223 insertions, 0 deletions
diff --git a/engine/events/happiness_egg.asm b/engine/events/happiness_egg.asm
new file mode 100755
index 000000000..a4ae8b7e6
--- /dev/null
+++ b/engine/events/happiness_egg.asm
@@ -0,0 +1,223 @@
+GetFirstPokemonHappiness: ; 718d
+	ld hl, PartyMon1Happiness
+	ld bc, PARTYMON_STRUCT_LENGTH
+	ld de, PartySpecies
+.loop
+	ld a, [de]
+	cp EGG
+	jr nz, .done
+	inc de
+	add hl, bc
+	jr .loop
+
+.done
+	ld [wd265], a
+	ld a, [hl]
+	ld [ScriptVar], a
+	call GetPokemonName
+	jp CopyPokemonName_Buffer1_Buffer3
+
+CheckFirstMonIsEgg: ; 71ac
+	ld a, [PartySpecies]
+	ld [wd265], a
+	cp EGG
+	ld a, $1
+	jr z, .egg
+	xor a
+
+.egg
+	ld [ScriptVar], a
+	call GetPokemonName
+	jp CopyPokemonName_Buffer1_Buffer3
+
+ChangeHappiness: ; 71c2
+; Perform happiness action c on CurPartyMon
+
+	ld a, [CurPartyMon]
+	inc a
+	ld e, a
+	ld d, 0
+	ld hl, PartySpecies - 1
+	add hl, de
+	ld a, [hl]
+	cp EGG
+	ret z
+
+	push bc
+	ld hl, PartyMon1Happiness
+	ld bc, PARTYMON_STRUCT_LENGTH
+	ld a, [CurPartyMon]
+	call AddNTimes
+	pop bc
+
+	ld d, h
+	ld e, l
+
+	push de
+	ld a, [de]
+	cp HAPPINESS_THRESHOLD_1
+	ld e, 0
+	jr c, .ok
+	inc e
+	cp HAPPINESS_THRESHOLD_2
+	jr c, .ok
+	inc e
+
+.ok
+	dec c
+	ld b, 0
+	ld hl, HappinessChanges
+	add hl, bc
+	add hl, bc
+	add hl, bc
+	ld d, 0
+	add hl, de
+	ld a, [hl]
+	cp $64 ; why not $80?
+	pop de
+
+	ld a, [de]
+	jr nc, .negative
+	add [hl]
+	jr nc, .done
+	ld a, -1
+	jr .done
+
+.negative
+	add [hl]
+	jr c, .done
+	xor a
+
+.done
+	ld [de], a
+	ld a, [wBattleMode]
+	and a
+	ret z
+	ld a, [CurPartyMon]
+	ld b, a
+	ld a, [wPartyMenuCursor]
+	cp b
+	ret nz
+	ld a, [de]
+	ld [BattleMonHappiness], a
+	ret
+
+
+INCLUDE "data/happiness_changes.asm"
+
+
+StepHappiness:: ; 725a
+; Raise the party's happiness by 1 point every other step cycle.
+
+	ld hl, wHappinessStepCount
+	ld a, [hl]
+	inc a
+	and 1
+	ld [hl], a
+	ret nz
+
+	ld de, PartyCount
+	ld a, [de]
+	and a
+	ret z
+
+	ld c, a
+	ld hl, PartyMon1Happiness
+.loop
+	inc de
+	ld a, [de]
+	cp EGG
+	jr z, .next
+	inc [hl]
+	jr nz, .next
+	ld [hl], $ff
+
+.next
+	push de
+	ld de, PARTYMON_STRUCT_LENGTH
+	add hl, de
+	pop de
+	dec c
+	jr nz, .loop
+	ret
+
+
+DayCareStep:: ; 7282
+; Raise the experience of Day-Care Pokémon every step cycle.
+
+	ld a, [wDayCareMan]
+	bit 0, a
+	jr z, .day_care_lady
+
+	ld a, [wBreedMon1Level] ; level
+	cp MAX_LEVEL
+	jr nc, .day_care_lady
+	ld hl, wBreedMon1Exp + 2 ; exp
+	inc [hl]
+	jr nz, .day_care_lady
+	dec hl
+	inc [hl]
+	jr nz, .day_care_lady
+	dec hl
+	inc [hl]
+	ld a, [hl]
+	cp HIGH(MAX_DAY_CARE_EXP >> 8)
+	jr c, .day_care_lady
+	ld a, HIGH(MAX_DAY_CARE_EXP >> 8)
+	ld [hl], a
+
+.day_care_lady
+	ld a, [wDayCareLady]
+	bit 0, a
+	jr z, .check_egg
+
+	ld a, [wBreedMon2Level] ; level
+	cp MAX_LEVEL
+	jr nc, .check_egg
+	ld hl, wBreedMon2Exp + 2 ; exp
+	inc [hl]
+	jr nz, .check_egg
+	dec hl
+	inc [hl]
+	jr nz, .check_egg
+	dec hl
+	inc [hl]
+	ld a, [hl]
+	cp HIGH(MAX_DAY_CARE_EXP >> 8)
+	jr c, .check_egg
+	ld a, HIGH(MAX_DAY_CARE_EXP >> 8)
+	ld [hl], a
+
+.check_egg
+	ld hl, wDayCareMan
+	bit 5, [hl] ; egg
+	ret z
+	ld hl, wStepsToEgg
+	dec [hl]
+	ret nz
+
+	call Random
+	ld [hl], a
+	callfar CheckBreedmonCompatibility
+	ld a, [wd265]
+	cp 230
+	ld b, 32 percent - 1
+	jr nc, .okay
+	ld a, [wd265]
+	cp 170
+	ld b, 16 percent
+	jr nc, .okay
+	ld a, [wd265]
+	cp 110
+	ld b, 12 percent
+	jr nc, .okay
+	ld b, 4 percent
+
+.okay
+	call Random
+	cp b
+	ret nc
+	ld hl, wDayCareMan
+	res 5, [hl]
+	set 6, [hl]
+	ret