;license:MIT
;(c) 2018-2020 by 4am
;
; Browse Mode - main UI
;
; Public functions
; - BrowseMode
;

;------------------------------------------------------------------------------
; BrowseMode
; main entry point for Browse Mode, which allows the user to browse the game
; catalog in alphabetical order and launch games
;
; in:    none
; out:   never returns to caller (may JMP to other major modes)
;------------------------------------------------------------------------------
BrowseMode
         ldx   #$FF
         txs

@BrowseModeInputLoop
         jsr   WaitForKeyFor30Seconds
         bit   CLEARKBD

; indices into BrowseDispatchTable below
kBrowseSearch   = 0
kBrowsePrevious = 1
kBrowseNext     = 2
kBrowseExitToSearch = 3
kBrowseTab      = 4
kBrowseLaunch   = 5
kBrowseHelp     = 6
kBrowseCredits  = 7
kBrowseCheat    = 8
kSoftBell       = 9 ; must match kInputError
kBrowseJoystick = 10

         ldy   #kNumBrowseKeys
-        dey
         bmi   @noKeyMatch
         cmp   BrowseKeys,y
         bne   -
         ldx   BrowseKeyDispatch,y
         bne   @BrowseDispatch       ; always branches

@noKeyMatch
         jsr   IsSearchKey
         bne   @BrowseDispatch
         ldx   #kBrowseSearch

         ; execution falls through here
@BrowseDispatch
         ldy   BrowseDispatchTableLo,x
         sty   @j+1
         ldy   BrowseDispatchTableHi,x
         sty   @j+2
@j       jsr   $FDFD                 ; SMC
         jmp   @BrowseModeInputLoop

OnBrowseSearch
         sta   InputBuffer
         lda   #$01
         sta   InputLength
         jmp   SearchMode

OnBrowsePrevious
         +LD16 gGameToLaunch
         +CMP16 0
         bne   @notFirstGame
         +LD16 GameCount
@notFirstGame
         +DEC16
         +ST16 gGameToLaunch
         jmp   OnBrowseChanged

OnBrowseNext
         +LD16 gGameToLaunch
         +INC16
         +CMP16ADDR GameCount
         bne   @notLastGame
         lda   #0
         tay
@notLastGame
         +ST16 gGameToLaunch
         jmp   OnBrowseChanged

OnBrowseLaunch
         jsr   PlayGame
         jsr   BlankHGR
         jmp   ForceBrowseChanged

OnBrowseCheat
         jsr   ToggleCheat
         beq   ForceBrowseChanged    ; always branches because Z=1 on exit from ToggleCheat

OnBrowseTab
         jsr   MiniAttractMode
         cmp   #$8D
         beq   OnBrowseLaunch
         ; execution falls through here
ForceBrowseChanged
         bit   CLEARKBD
         ; execution falls through here
OnBrowseChanged
; in:    gGameToLaunch = game index (word)
         jsr   SwitchToBank2
         jsr   EnableAcceleratorAndSwitchToBank1
         jsr   LoadGameTitleOffscreen
         jsr   DrawUIWithoutDots
         jmp   MaybeAnimateTitle
BrowseCreditsWrapper
         jsr   Credits
         jmp   ForceBrowseChanged
BrowseHelpWrapper
         jsr   Help
         jmp   ForceBrowseChanged

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

BrowseDispatchTableLo
         !byte <OnBrowseSearch
         !byte <OnBrowsePrevious
         !byte <OnBrowseNext
         !byte <SearchMode
         !byte <OnBrowseTab
         !byte <OnBrowseLaunch
         !byte <BrowseHelpWrapper
         !byte <BrowseCreditsWrapper
         !byte <OnBrowseCheat
         !byte <SoftBell
         !byte <Joystick
BrowseDispatchTableHi
         !byte >OnBrowseSearch
         !byte >OnBrowsePrevious
         !byte >OnBrowseNext
         !byte >SearchMode
         !byte >OnBrowseTab
         !byte >OnBrowseLaunch
         !byte >BrowseHelpWrapper
         !byte >BrowseCreditsWrapper
         !byte >OnBrowseCheat
         !byte >SoftBell
         !byte >Joystick

kNumBrowseKeys = 13                  ; number of entries in next 2 tables (each)
BrowseKeys
         !byte $83                   ; Ctrl-C = toggle cheat mode
         !byte $81                   ; Ctrl-A = about
         !byte $AF                   ; '/' = help
         !byte $BF                   ; '?' = help
         !byte $A0                   ; Space = mini attract mode
         !byte $89                   ; TAB = mini attract mode
         !byte $8D                   ; ENTER = launch current game
         !byte $9B                   ; Esc = switch to search mode
         !byte $8A                   ; down arrow = next
         !byte $95                   ; right arrow = next
         !byte $8B                   ; up arrow = previous
         !byte $88                   ; left arrow = previous
         !byte $90                   ; Ctrl-P = launch joystick calibration program
BrowseKeyDispatch
         !byte kBrowseCheat
         !byte kBrowseCredits
         !byte kBrowseHelp
         !byte kBrowseHelp
         !byte kBrowseTab
         !byte kBrowseTab
         !byte kBrowseLaunch
         !byte kBrowseExitToSearch
         !byte kBrowseNext
         !byte kBrowseNext
         !byte kBrowsePrevious
         !byte kBrowsePrevious
         !byte kBrowseJoystick

GameCount
         !word 0