1 files changed, 161 insertions, 0 deletions
diff --git a/engine/events/hidden_items.asm b/engine/events/hidden_items.asm
new file mode 100755
index 00000000..e40b0ac7
--- /dev/null
+++ b/engine/events/hidden_items.asm
@@ -0,0 +1,161 @@
+HiddenItems:
+	ld hl, HiddenItemCoords
+	call FindHiddenItemOrCoinsIndex
+	ld [wHiddenItemOrCoinsIndex], a
+	ld hl, wObtainedHiddenItemsFlags
+	ld a, [wHiddenItemOrCoinsIndex]
+	ld c, a
+	ld b, FLAG_TEST
+	predef FlagActionPredef
+	ld a, c
+	and a
+	ret nz
+	call EnableAutoTextBoxDrawing
+	ld a, 1
+	ld [wDoNotWaitForButtonPressAfterDisplayingText], a
+	ld a, [wHiddenObjectFunctionArgument] ; item ID
+	ld [wd11e], a
+	call GetItemName
+	tx_pre_jump FoundHiddenItemText
+
+INCLUDE "data/hidden_item_coords.asm"
+
+FoundHiddenItemText::
+	TX_FAR _FoundHiddenItemText
+	TX_ASM
+	ld a, [wHiddenObjectFunctionArgument] ; item ID
+	ld b, a
+	ld c, 1
+	call GiveItem
+	jr nc, .bagFull
+	ld hl, wObtainedHiddenItemsFlags
+	ld a, [wHiddenItemOrCoinsIndex]
+	ld c, a
+	ld b, FLAG_SET
+	predef FlagActionPredef
+	ld a, SFX_GET_ITEM_2
+	call PlaySoundWaitForCurrent
+	call WaitForSoundToFinish
+	jp TextScriptEnd
+.bagFull
+	call WaitForTextScrollButtonPress ; wait for button press
+	xor a
+	ld [wDoNotWaitForButtonPressAfterDisplayingText], a
+	ld hl, HiddenItemBagFullText
+	call PrintText
+	jp TextScriptEnd
+
+HiddenItemBagFullText::
+	TX_FAR _HiddenItemBagFullText
+	db "@"
+
+HiddenCoins:
+	ld b, COIN_CASE
+	predef GetQuantityOfItemInBag
+	ld a, b
+	and a
+	ret z
+	ld hl, HiddenCoinCoords
+	call FindHiddenItemOrCoinsIndex
+	ld [wHiddenItemOrCoinsIndex], a
+	ld hl, wObtainedHiddenCoinsFlags
+	ld a, [wHiddenItemOrCoinsIndex]
+	ld c, a
+	ld b, FLAG_TEST
+	predef FlagActionPredef
+	ld a, c
+	and a
+	ret nz
+	xor a
+	ld [hUnusedCoinsByte], a
+	ld [hCoins], a
+	ld [hCoins + 1], a
+	ld a, [wHiddenObjectFunctionArgument]
+	sub COIN
+	cp 10
+	jr z, .bcd10
+	cp 20
+	jr z, .bcd20
+	cp 40
+	jr z, .bcd20 ; should be bcd40
+	jr .bcd100
+.bcd10
+	ld a, $10
+	ld [hCoins + 1], a
+	jr .bcdDone
+.bcd20
+	ld a, $20
+	ld [hCoins + 1], a
+	jr .bcdDone
+.bcd40 ; due to a typo, this is never used
+	ld a, $40
+	ld [hCoins + 1], a
+	jr .bcdDone
+.bcd100
+	ld a, $1
+	ld [hCoins], a
+.bcdDone
+	ld de, wPlayerCoins + 1
+	ld hl, hCoins + 1
+	ld c, $2
+	predef AddBCDPredef
+	ld hl, wObtainedHiddenCoinsFlags
+	ld a, [wHiddenItemOrCoinsIndex]
+	ld c, a
+	ld b, FLAG_SET
+	predef FlagActionPredef
+	call EnableAutoTextBoxDrawing
+	ld a, [wPlayerCoins]
+	cp $99
+	jr nz, .roomInCoinCase
+	ld a, [wPlayerCoins + 1]
+	cp $99
+	jr nz, .roomInCoinCase
+	tx_pre_id DroppedHiddenCoinsText
+	jr .done
+.roomInCoinCase
+	tx_pre_id FoundHiddenCoinsText
+.done
+	jp PrintPredefTextID
+
+INCLUDE "data/hidden_coins.asm"
+
+FoundHiddenCoinsText::
+	TX_FAR _FoundHiddenCoinsText
+	TX_SFX_ITEM_2
+	db "@"
+
+DroppedHiddenCoinsText::
+	TX_FAR _FoundHiddenCoins2Text
+	TX_SFX_ITEM_2
+	TX_FAR _DroppedHiddenCoinsText
+	db "@"
+
+FindHiddenItemOrCoinsIndex:
+	ld a, [wHiddenObjectY]
+	ld d, a
+	ld a, [wHiddenObjectX]
+	ld e, a
+	ld a, [wCurMap]
+	ld b, a
+	ld c, -1
+.loop
+	inc c
+	ld a, [hli]
+	cp $ff ; end of the list?
+	ret z  ; if so, we're done here
+	cp b
+	jr nz, .next1
+	ld a, [hli]
+	cp d
+	jr nz, .next2
+	ld a, [hli]
+	cp e
+	jr nz, .loop
+	ld a, c
+	ret
+.next1
+	inc hl
+.next2
+	inc hl
+	jr .loop