; =============================================================================
;  Item Selection Code

; Decides which function to jump to.
Menu_ItemIndex:
  db $00
  ;  Bow,     Boomerang, Hookshot, Bombs,      Powder,     Bottle 1
  db $03,     $02,       $0E,      $01,        $0A,        $0B
  ;  Hammer,  Lamp,      Fire Rod, Ice Rod,    Mirror,     Bottle 2
  db $04,     $09,       $05,      $06,        $14,        $0B
  ;  Ocarina, Book,      Somaria,  Byrna,      Feather,    Bottle3
  db $08,     $0C,       $12,      $0D,        $07,        $0B
  ;  Deku,    Zora,      Wolf,     Bunny Hood, Stone Mask, Bottle4
  db $11,     $0F,       $08,      $10,        $13,        $0B

; -----------------------------------------------------------------------------
; Decides which graphics is drawn 
Menu_AddressIndex:
  db $7EF340 ; Bow
  db $7EF341 ; Boomerang
  db $7EF342 ; Hookshot 
  db $7EF343 ; Bombs
  db $7EF344 ; Powder 
  db $7EF35C ; Bottle 1

  db $7EF34B ; Hammer 
  db $7EF34A ; Lamp 
  db $7EF345 ; Fire Rod
  db $7EF346 ; Ice Rod 
  db $7EF353 ; Magic Mirror
  db $7EF35D ; Bottle 2

  db $7EF34C ; shovel 7EF34F
  db $7EF34E ; Book 
  db $7EF350 ; Cane of Somaria
  db $7EF351 ; Cane of Byrna
  db $7EF34D ; Roc's Feather 
  db $7EF35E ; Bottle 3

  db $7EF349 ; Deku Mask 
  db $7EF347 ; Zora Mask
  db $7EF358 ; Wolf Mask 
  db $7EF348 ; Bunny Hood
  db $7EF352 ; Stone Mask
  db $7EF35F ; Bottle #4

; -----------------------------------------------------------------------------

Menu_ItemCursorPositions:
  dw menu_offset(6,2)  ; bow
  dw menu_offset(6,5)  ; boom
  dw menu_offset(6,8)  ; hookshot
  dw menu_offset(6,12) ; bombs
  dw menu_offset(6,15) ; deku mask
  dw menu_offset(6,18) ; bottle1

  dw menu_offset(9,2)  ; hammer 
  dw menu_offset(9,5)  ; lamp
  dw menu_offset(9,8)  ; firerod
  dw menu_offset(9,12) ; icerod
  dw menu_offset(9,15) ; goron
  dw menu_offset(9,18) ; bottle2

  dw menu_offset(12,2)  ; shovel 
  dw menu_offset(12,5)  ; feather 
  dw menu_offset(12,8)  ; somaria
  dw menu_offset(12,12) ; byrna
  dw menu_offset(12,15) ; bunny hood
  dw menu_offset(12,18) ; bottle3

  dw menu_offset(15,2)  ; powder 
  dw menu_offset(15,5)  ; book 
  dw menu_offset(15,8)  ; flute
  dw menu_offset(15,12) ; mirror
  dw menu_offset(15,15) ; stone mask 
  dw menu_offset(15,18) ; bottle4

; -----------------------------------------------------------------------------


Menu_FindNextItem:
{
  LDY.w $0202 : INY
  CPY.b #$19 : BCC .no_reset
  LDY.b #$01
.no_reset 
  STY.w $0202
  LDX.w Menu_AddressIndex-1, Y
  LDA.l $7EF300,             X
  BEQ   Menu_FindNextItem
  RTS
}

; -----------------------------------------------------------------------------

Menu_FindPrevItem:
{
  LDY.w $0202 : DEY : BNE .no_reset
  LDY.b #$18
.no_reset 
  STY.w $0202
  LDX.w Menu_AddressIndex-1, Y
  LDA.l $7EF300,             X
  BEQ   Menu_FindPrevItem
  RTS
}

; -----------------------------------------------------------------------------

Menu_FindNextDownItem:
{
  LDA.w $0202 : CLC : ADC.b #$06
  CMP.b #$19 : BCC .no_reset
  SBC.b #$18
.no_reset 
  TAY   : STY.w $0202
  LDX.w Menu_AddressIndex-1, Y
  LDA.l $7EF300,             X
  BEQ   Menu_FindNextItem
  RTS 
}

; -----------------------------------------------------------------------------

Menu_FindNextUpItem:
{
  LDA.w $0202 : SEC : SBC.b #$06
  BPL   .no_reset : BNE .no_reset
  CLC   : ADC.b #$18
.no_reset 
  TAY   : STY.w $0202
  LDX.w Menu_AddressIndex-1, Y
  LDA.l $7EF300,             X
  BEQ   Menu_FindNextItem
  RTS 
}


; -----------------------------------------------------------------------------

Menu_DeleteCursor:
{
  REP   #$30
  LDX.w Menu_ItemCursorPositions-2, Y

  LDA.w #$20F5
  STA.w $1108, X
  STA.w $1148, X
  STA.w $114E, X
  STA.w $110E, X
  STA.w $11C8, X
  STA.w $1188, X
  STA.w $118E, X
  STA.w $11CE, X
  SEP   #$30
  STZ   $0207
  RTS 
}

; -----------------------------------------------------------------------------

Menu_InitItemScreen:
{
  SEP   #$30
  LDY.w $0202 : BNE .all_good

.loop
  INY   : CPY.b #$25 : BCS .bad
  LDX.w Menu_AddressIndex-1, Y
  LDA.l $7EF300,             X
  BEQ   .loop

  STY.w $0202
  BRA   .all_good

.bad
  STZ.w $0202

.all_good 
  STZ   $0207
  LDA.b #$04
  STA.w $0200
  RTS
}

; -----------------------------------------------------------------------------

Menu_AddressLong:
  db $7EF340 ; Bow
  db $7EF341 ; Boomerang
  db $7EF342 ; Hookshot 
  db $7EF343 ; Bombs
  db $7EF344 ; Powder 
  db $7EF35C ; Bottle 1

  db $7EF34B ; Hammer 
  db $7EF34A ; Lamp 
  db $7EF345 ; Fire Rod
  db $7EF346 ; Ice Rod 
  db $7EF353 ; Magic Mirror
  db $7EF35D ; Bottle 2

  db $7EF34C ; shovel 7EF34F
  db $7EF34E ; Book 
  db $7EF350 ; Cane of Somaria
  db $7EF351 ; Cane of Byrna
  db $7EF34D ; Roc's Feather 
  db $7EF35E ; Bottle 3

  db $7EF349 ; Deku Mask 
  db $7EF347 ; Zora Mask
  db $7EF358 ; Wolf Mask 
  db $7EF348 ; Bunny Hood
  db $7EF352 ; Stone Mask
  db $7EF35F ; Bottle #4

GotoNextItem_Override:
{
  ; Load our currently equipped item, and move to the next one
  ; If we reach our limit (21), set it back to the bow and arrow slot.
  LDA $0202 : INC A : CMP.b #$18 : BCC .dontReset
  
  LDA.b #$01

.dontReset

  ; Otherwise try to equip the item in the next slot
  STA $0202
  
  RTS
}

DoWeHaveThisItem_Override:
{
  LDY $0202
  LDX.w Menu_AddressLong, Y
  LDA.l $7EF300,             X
  BNE .have_this_item
  CLC
  RTL
.have_this_item
  SEC 
  RTL
}

TryEquipNextItem_Override:
{
.keep_looking
  JSL GotoNextItem_Override
  JSL DoWeHaveThisItem_Override : BCC .keep_looking
  RTL
}

SearchForEquippedItem_Override:
{
    SEP   #$30
 
    LDY $0202
    LDX.w Menu_AddressLong-1, Y
    LDA.l $7EF300,             X
    
    CMP.b #$00 : BNE .equippableItemAvailable
    
    ; In this case we have no equippable items
    STZ $0202 : STZ $0203 : STZ $0204

  .weHaveThatItem

    RTL

  .equippableItemAvailable

    ; Is there an item currently equipped (in the HUD slot)?
    LDA $0202
    BNE .alreadyEquipped
    
    ; If not, set the equipped item to the Bow and Arrow (even if we don't actually have it)
    LDA.b #$01 : STA   $0202

  .alreadyEquipped

    ; Checks to see if we actually have that item
    ; We're done if we have that item
    JSR DoWeHaveThisItem_Override
    BCS .weHaveThatItem
    
    JMP TryEquipNextItem_Override
}

; -----------------------------------------------------------------------------

pushpc 

org $0DDEB0
DoWeHaveThisItem:
{
  JSL DoWeHaveThisItem_Override
  RTS
}

org $0DDEE2
TryEquipNextItem:
  JSL TryEquipNextItem_Override
  RTS

org $0DE399
SearchForEquippedItem:
{
  PHB : PHK : PLB
  JSL SearchForEquippedItem_Override
  PLB 
  RTS
}
warnpc $0DE3C7

pullpc