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-rw-r--r--engine/items/buy_sell_toss.asm218
-rw-r--r--engine/items/switch_items.asm272
-rw-r--r--engine/items/update_item_description.asm13
3 files changed, 503 insertions, 0 deletions
diff --git a/engine/items/buy_sell_toss.asm b/engine/items/buy_sell_toss.asm
new file mode 100644
index 00000000..45c3dfcf
--- /dev/null
+++ b/engine/items/buy_sell_toss.asm
@@ -0,0 +1,218 @@
+SelectQuantityToToss:
+ ld hl, TossItem_MenuHeader
+ call LoadMenuHeader
+ call Toss_Sell_Loop
+ ret
+
+SelectQuantityToBuy:
+ farcall GetItemPrice
+ ld a, d
+ ld [wBuffer1], a
+ ld a, e
+ ld [wBuffer2], a
+ ld hl, BuyItem_MenuHeader
+ call LoadMenuHeader
+ call Toss_Sell_Loop
+ ret
+
+SelectQuantityToSell:
+ farcall GetItemPrice
+ ld a, d
+ ld [wBuffer1], a
+ ld a, e
+ ld [wBuffer2], a
+ ld hl, SellItem_MenuHeader
+ call LoadMenuHeader
+ call Toss_Sell_Loop
+ ret
+
+Toss_Sell_Loop:
+ ld a, 1
+ ld [wItemQuantityChangeBuffer], a
+.loop
+ call BuySellToss_UpdateQuantityDisplay ; update display
+ call BuySellToss_InterpretJoypad ; joy action
+ jr nc, .loop
+ cp -1
+ jr nz, .nope ; pressed B
+ scf
+ ret
+
+.nope
+ and a
+ ret
+
+BuySellToss_InterpretJoypad:
+ call JoyTextDelay_ForcehJoyDown ; get joypad
+ bit B_BUTTON_F, c
+ jr nz, .b
+ bit A_BUTTON_F, c
+ jr nz, .a
+ bit D_DOWN_F, c
+ jr nz, .down
+ bit D_UP_F, c
+ jr nz, .up
+ bit D_LEFT_F, c
+ jr nz, .left
+ bit D_RIGHT_F, c
+ jr nz, .right
+ and a
+ ret
+
+.b
+ ld a, -1
+ scf
+ ret
+
+.a
+ ld a, 0
+ scf
+ ret
+
+.down
+ ld hl, wItemQuantityChangeBuffer
+ dec [hl]
+ jr nz, .finish_down
+ ld a, [wItemQuantityBuffer]
+ ld [hl], a
+
+.finish_down
+ and a
+ ret
+
+.up
+ ld hl, wItemQuantityChangeBuffer
+ inc [hl]
+ ld a, [wItemQuantityBuffer]
+ cp [hl]
+ jr nc, .finish_up
+ ld [hl], 1
+
+.finish_up
+ and a
+ ret
+
+.left
+ ld a, [wItemQuantityChangeBuffer]
+ sub 10
+ jr c, .load_1
+ jr z, .load_1
+ jr .finish_left
+
+.load_1
+ ld a, 1
+
+.finish_left
+ ld [wItemQuantityChangeBuffer], a
+ and a
+ ret
+
+.right
+ ld a, [wItemQuantityChangeBuffer]
+ add 10
+ ld b, a
+ ld a, [wItemQuantityBuffer]
+ cp b
+ jr nc, .finish_right
+ ld b, a
+
+.finish_right
+ ld a, b
+ ld [wItemQuantityChangeBuffer], a
+ and a
+ ret
+
+BuySellToss_UpdateQuantityDisplay:
+ call MenuBox
+ call MenuBoxCoord2Tile
+ ld de, SCREEN_WIDTH + 1
+ add hl, de
+ ld [hl], "×"
+ inc hl
+ ld de, wItemQuantityChangeBuffer
+ lb bc, PRINTNUM_LEADINGZEROS | 1, 2
+ call PrintNum
+ ld a, [wMenuDataPointer]
+ ld e, a
+ ld a, [wMenuDataPointer + 1]
+ ld d, a
+ push de
+ ret
+
+ret_24ff3:
+ ret
+
+DisplayPurchasePrice:
+ call BuySell_MultiplyPrice
+ call BuySell_DisplaySubtotal
+ ret
+
+DisplaySellingPrice:
+ call BuySell_MultiplyPrice
+ call Sell_HalvePrice
+ call BuySell_DisplaySubtotal
+ ret
+
+BuySell_MultiplyPrice:
+ xor a
+ ldh [hMultiplicand + 0], a
+ ld a, [wBuffer1]
+ ldh [hMultiplicand + 1], a
+ ld a, [wBuffer2]
+ ldh [hMultiplicand + 2], a
+ ld a, [wItemQuantityChangeBuffer]
+ ldh [hMultiplier], a
+ push hl
+ call Multiply
+ pop hl
+ ret
+
+Sell_HalvePrice:
+ push hl
+ ld hl, hProduct + 1
+ ld a, [hl]
+ srl a
+ ld [hli], a
+ ld a, [hl]
+ rra
+ ld [hli], a
+ ld a, [hl]
+ rra
+ ld [hl], a
+ pop hl
+ ret
+
+BuySell_DisplaySubtotal:
+ push hl
+ ld hl, hMoneyTemp
+ ldh a, [hProduct + 1]
+ ld [hli], a
+ ldh a, [hProduct + 2]
+ ld [hli], a
+ ldh a, [hProduct + 3]
+ ld [hl], a
+ pop hl
+ inc hl
+ ld de, hMoneyTemp
+ lb bc, PRINTNUM_MONEY | 3, 6
+ call PrintNum
+ call WaitBGMap
+ ret
+
+TossItem_MenuHeader:
+ db MENU_BACKUP_TILES ; flags
+ menu_coords 15, 9, SCREEN_WIDTH - 1, TEXTBOX_Y - 1
+ dw ret_24ff3
+ db 0 ; default option
+
+BuyItem_MenuHeader:
+ db MENU_BACKUP_TILES ; flags
+ menu_coords 7, 15, SCREEN_WIDTH - 1, SCREEN_HEIGHT - 1
+ dw DisplayPurchasePrice
+ db -1 ; default option
+
+SellItem_MenuHeader:
+ db MENU_BACKUP_TILES ; flags
+ menu_coords 7, 15, SCREEN_WIDTH - 1, SCREEN_HEIGHT - 1
+ dw DisplaySellingPrice
+ db 0 ; default option
diff --git a/engine/items/switch_items.asm b/engine/items/switch_items.asm
new file mode 100644
index 00000000..283823e4
--- /dev/null
+++ b/engine/items/switch_items.asm
@@ -0,0 +1,272 @@
+SwitchItemsInBag:
+ ld a, [wSwitchItem]
+ and a
+ jr z, .init
+ ld b, a
+ ld a, [wScrollingMenuCursorPosition]
+ inc a
+ cp b
+ jr z, .trivial
+ ld a, [wScrollingMenuCursorPosition]
+ call ItemSwitch_GetNthItem
+ ld a, [hl]
+ cp -1
+ ret z
+ ld a, [wSwitchItem]
+ dec a
+ ld [wSwitchItem], a
+ call Function248cf
+ jp c, Function248f9
+ ld a, [wScrollingMenuCursorPosition]
+ ld c, a
+ ld a, [wSwitchItem]
+ cp c
+ jr c, .asm_248a2
+ jr .asm_24872
+
+.init
+ ld a, [wScrollingMenuCursorPosition]
+ inc a
+ ld [wSwitchItem], a
+ ret
+
+.trivial
+ xor a
+ ld [wSwitchItem], a
+ ret
+
+.asm_24872
+ ld a, [wSwitchItem]
+ call Function24968
+ ld a, [wScrollingMenuCursorPosition]
+ ld d, a
+ ld a, [wSwitchItem]
+ ld e, a
+ call Function24994
+ push bc
+ ld a, [wSwitchItem]
+ call ItemSwitch_GetNthItem
+ dec hl
+ push hl
+ call ItemSwitch_ConvertItemFormatToDW
+ add hl, bc
+ ld d, h
+ ld e, l
+ pop hl
+ pop bc
+ call Function249d3
+ ld a, [wScrollingMenuCursorPosition]
+ call Function24975
+ xor a
+ ld [wSwitchItem], a
+ ret
+
+.asm_248a2
+ ld a, [wSwitchItem]
+ call Function24968
+ ld a, [wScrollingMenuCursorPosition]
+ ld d, a
+ ld a, [wSwitchItem]
+ ld e, a
+ call Function24994
+ push bc
+ ld a, [wSwitchItem]
+ call ItemSwitch_GetNthItem
+ ld d, h
+ ld e, l
+ call ItemSwitch_ConvertItemFormatToDW
+ add hl, bc
+ pop bc
+ call CopyBytes
+ ld a, [wScrollingMenuCursorPosition]
+ call Function24975
+ xor a
+ ld [wSwitchItem], a
+ ret
+
+Function248cf:
+ ld a, [wSwitchItem]
+ call ItemSwitch_GetNthItem
+ ld d, h
+ ld e, l
+ ld a, [wScrollingMenuCursorPosition]
+ call ItemSwitch_GetNthItem
+ ld a, [de]
+ cp [hl]
+ jr nz, .asm_249cd
+ ld a, [wScrollingMenuCursorPosition]
+ call Function249bf
+ cp 99
+ jr z, .asm_249cd
+ ld a, [wSwitchItem]
+ call Function249bf
+ cp 99
+ jr nz, .asm_249cf
+.asm_249cd
+ and a
+ ret
+
+.asm_249cf
+ scf
+ ret
+
+Function248f9:
+ ld a, [wSwitchItem]
+ call ItemSwitch_GetNthItem
+ inc hl
+ push hl
+ ld a, [wScrollingMenuCursorPosition]
+ call ItemSwitch_GetNthItem
+ inc hl
+ ld a, [hl]
+ pop hl
+ add [hl]
+ cp 100
+ jr c, .asm_24a01
+ sub 99
+ push af
+ ld a, [wScrollingMenuCursorPosition]
+ call ItemSwitch_GetNthItem
+ inc hl
+ ld [hl], 99
+ ld a, [wSwitchItem]
+ call ItemSwitch_GetNthItem
+ inc hl
+ pop af
+ ld [hl], a
+ xor a
+ ld [wSwitchItem], a
+ ret
+
+.asm_24a01
+ push af
+ ld a, [wScrollingMenuCursorPosition]
+ call ItemSwitch_GetNthItem
+ inc hl
+ pop af
+ ld [hl], a
+ ld hl, wMenuData_ItemsPointerAddr
+ ld a, [hli]
+ ld h, [hl]
+ ld l, a
+ ld a, [wSwitchItem]
+ cp [hl]
+ jr nz, .asm_24a25
+ dec [hl]
+ ld a, [wSwitchItem]
+ call ItemSwitch_GetNthItem
+ ld [hl], $ff
+ xor a
+ ld [wSwitchItem], a
+ ret
+
+.asm_24a25
+ dec [hl]
+ call ItemSwitch_ConvertItemFormatToDW
+ push bc
+ ld a, [wSwitchItem]
+ call ItemSwitch_GetNthItem
+ pop bc
+ push hl
+ add hl, bc
+ pop de
+.asm_24a34
+ ld a, [hli]
+ ld [de], a
+ inc de
+ cp $ff
+ jr nz, .asm_24a34
+ xor a
+ ld [wSwitchItem], a
+ ret
+
+Function24968:
+ call ItemSwitch_GetNthItem
+ ld de, wceed
+ call ItemSwitch_ConvertItemFormatToDW
+ call CopyBytes
+ ret
+
+Function24975:
+ call ItemSwitch_GetNthItem
+ ld d, h
+ ld e, l
+ ld hl, wceed
+ call ItemSwitch_ConvertItemFormatToDW
+ call CopyBytes
+ ret
+
+ItemSwitch_GetNthItem:
+ push af
+ call ItemSwitch_ConvertItemFormatToDW
+ ld hl, wMenuData_ItemsPointerAddr
+ ld a, [hli]
+ ld h, [hl]
+ ld l, a
+ inc hl
+ pop af
+ call AddNTimes
+ ret
+
+Function24994:
+ push hl
+ call ItemSwitch_ConvertItemFormatToDW
+ ld a, d
+ sub e
+ jr nc, .dont_negate
+ dec a
+ cpl
+.dont_negate
+ ld hl, 0
+ call AddNTimes
+ ld b, h
+ ld c, l
+ pop hl
+ ret
+
+ItemSwitch_ConvertItemFormatToDW:
+ push hl
+ ld a, [wMenuData_ScrollingMenuItemFormat]
+ ld c, a
+ ld b, 0
+ ld hl, .format_dws
+ add hl, bc
+ add hl, bc
+ ld c, [hl]
+ inc hl
+ ld b, [hl]
+ pop hl
+ ret
+
+.format_dws
+ dw 0
+ dw 1
+ dw 2
+
+Function249bf:
+ push af
+ call ItemSwitch_ConvertItemFormatToDW
+ ld a, c
+ cp 2
+ jr nz, .not_2
+ pop af
+ call ItemSwitch_GetNthItem
+ inc hl
+ ld a, [hl]
+ ret
+
+.not_2
+ pop af
+ ld a, $1
+ ret
+
+Function249d3:
+.loop
+ ld a, [hld]
+ ld [de], a
+ dec de
+ dec bc
+ ld a, b
+ or c
+ jr nz, .loop
+ ret
diff --git a/engine/items/update_item_description.asm b/engine/items/update_item_description.asm
new file mode 100644
index 00000000..da56732a
--- /dev/null
+++ b/engine/items/update_item_description.asm
@@ -0,0 +1,13 @@
+UpdateItemDescription:
+ ld a, [wMenuSelection]
+ ld [wCurSpecies], a
+ hlcoord 0, 12
+ ld b, 4
+ ld c, SCREEN_WIDTH - 2
+ call Textbox
+ ld a, [wMenuSelection]
+ cp -1
+ ret z
+ decoord 1, 14
+ farcall PrintItemDescription
+ ret
generated by cgit v1.2.3 (git 2.25.1) at 2025-06-27 09:58:38 +0000