;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
kBrowseQuit     = 11
kBrowseSHR      = 12

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

@noKeyMatch
         jsr   IsSearchKey
!if kBrowseSearch > 0 {
         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

;------------------------------------------------------------------------------
; internal functions

OnBrowseSearch
         sta   InputBuffer
         lda   #$01
         sta   InputLength
         jmp   SearchMode

OnBrowsePrevious
         jsr   AnyGameSelected
                                     ; A/Y = gGameToLaunch
         bcs   @goToLastGame         ; if no game selected, select last game
         tax                         ; X/Y = gGameToLaunch
         tya                         ; set up first comparison in CPX16 macro
         +CPX16_0_NE @notFirstGame   ; if first game selected, select last game
@goToLastGame
         +LDX16 GameCount
@notFirstGame
         +DEX16
         jmp   notLastGame

OnBrowseNext
         +LDX16 gGameToLaunch
         +INX16
         +CPX16ADDR_NE GameCount, notLastGame
         ldx   #0
         ldy   #0
notLastGame
         +STX16 gGameToLaunch
         jmp   OnBrowseChanged

ReloadIndexAndLaunch
         jsr   ReloadSearchIndex
OnBrowseLaunch
         jsr   PlayGame
         jsr   BlankHGR
         jmp   ForceBrowseChanged

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

OnBrowseTab
         jsr   MiniAttractMode
         jsr   HGRMode
         cmp   #$8D
         beq   ReloadIndexAndLaunch
         ; execution falls through here
ForceBrowseChanged
         jsr   ReloadSearchIndex
         bit   CLEARKBD
         ; execution falls through here
OnBrowseChanged
; in:    gGameToLaunch = game index (word)
;        gSearchStore populated
         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
         !byte <OnQuit
         !byte <AllSHRSlideshow
BrowseDispatchTableHi
         !byte >OnBrowseSearch
         !byte >OnBrowsePrevious
         !byte >OnBrowseNext
         !byte >SearchMode
         !byte >OnBrowseTab
         !byte >OnBrowseLaunch
         !byte >BrowseHelpWrapper
         !byte >BrowseCreditsWrapper
         !byte >OnBrowseCheat
         !byte >SoftBell
         !byte >Joystick
         !byte >OnQuit
         !byte >AllSHRSlideshow

kNumBrowseKeys = 15
                                     ; number of entries in next 2 tables (each)
BrowseKeys
         !byte $80                   ; Ctrl-@ = SHR-only slideshow
         !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 $90                   ; Ctrl-P = launch joystick calibration program
         !byte $91                   ; Ctrl-Q = quit
         !byte $9B                   ; Esc = switch to search mode
         !byte $8D                   ; ENTER = launch current game
         !byte $8B                   ; up arrow = previous
         !byte $8A                   ; down arrow = next
         !byte $88                   ; left arrow = previous
         !byte $95                   ; right arrow = next
BrowseKeyDispatch
         !byte kBrowseSHR
         !byte kBrowseCheat
         !byte kBrowseCredits
         !byte kBrowseHelp
         !byte kBrowseHelp
         !byte kBrowseTab
         !byte kBrowseTab
         !byte kBrowseJoystick
         !byte kBrowseQuit
         !byte kBrowseExitToSearch
         !byte kBrowseLaunch
         !byte kBrowsePrevious
         !byte kBrowseNext
         !byte kBrowsePrevious
         !byte kBrowseNext

GameCount
         !word 0