;license:MIT
;(c) 2018 by 4am
;
; User interface - click/activation callbacks and key handlers for main screen
;
; Public functions
; - HandleKey
;
; (all callbacks are defined in view configuration blocks
;  and triggered through UI actions or called from HandleKey)
;

; IDs of actions that do not correspond to WeeGUI view IDs have high bit set
ID_SCROLLUP    = $81
ID_SCROLLDOWN  = $82
ID_X           = $83
ID_Y           = $84
ID_Z           = $85

; action keys for main screen (should correspond to button titles)
kMainKeys
         !byte $C7,ID_PLAY           ; G
         !byte $E7,ID_PLAY           ; g
         !byte $8D,ID_PLAY           ; Return
         !byte $C8,ID_HINTS          ; H
         !byte $E8,ID_HINTS          ; h
         !byte $C1,ID_BOXART         ; A
         !byte $E1,ID_BOXART         ; a
         !byte $D6,ID_VERSIONS       ; V
         !byte $F6,ID_VERSIONS       ; v
         !byte $CA,ID_CATALOG        ; J
         !byte $EA,ID_CATALOG        ; j
         !byte $D3,ID_OPTIONS        ; S
         !byte $F3,ID_OPTIONS        ; s
         !byte $D0,ID_PREVIOUS       ; P
         !byte $F0,ID_PREVIOUS       ; p
         !byte $88,ID_PREVIOUS       ; left arrow
         !byte $CE,ID_NEXT           ; N
         !byte $EE,ID_NEXT           ; n
         !byte $95,ID_NEXT           ; right arrow
         !byte $8B,ID_SCROLLUP       ; up arrow
         !byte $8A,ID_SCROLLDOWN     ; down arrow
         !byte $D8,ID_X              ; X
         !byte $F8,ID_X              ; x
         !byte $D9,ID_Y              ; Y
         !byte $F9,ID_Y              ; y
         !byte $DA,ID_Z              ; Z
         !byte $FA,ID_Z              ; z
         !byte $BF,ID_ABOUT          ; ?
_endMainKeys

;------------------------------------------------------------------------------
; HandleKey
; handle keypresses in main screen
;
; in:    A contains key pressed
; out:   all registers and flags clobbered
;------------------------------------------------------------------------------
HandleKey
         ldx   #(_endMainKeys-kMainKeys)-2
-        cmp   kMainKeys,x
         beq   @found
         dex
         dex
         bpl   -
@error   jmp   SoftBell              ; unknown key, beep softly
@found   lda   kMainKeys+1,x         ; get ID associated with this key
         bpl   @activateView         ; ID < #$80 is a WeeGUI view, so activate it
         cmp   #ID_X                 ; X, Y, and Z keys are part of
         beq   @x                    ; an undocumented feature
         cmp   #ID_Y
         beq   @y
         cmp   #ID_Z
         beq   @z
         cmp   #ID_SCROLLDOWN        ; arrow keys scroll the description box
         beq   @down
         lda   #$01
         +HIDE_NEXT_2_BYTES
@down    lda   #$FF
         pha
         ldx   #WGSelectView
         lda   #ID_DESCRIPTION
         jsr   WeeGUI
         ldx   #WGScrollYBy
         pla
         jsr   WeeGUI
         bra   @click
@activateView
         tax
         ldy   gViewInUse,x
         beq   @error
         ldx   #WGSelectView
         jsr   WeeGUI
@click   jmp   SimulateClick

;------------------------------------------------------------------------------
; XYZZY handler
;------------------------------------------------------------------------------
@y       lda   @xyzzyCounter
         cmp   #1
         beq   @y1
         cmp   #4
         bne   @xyzzyReset
         beq   @xyzzyGo
@z       lda   @xyzzyCounter
         cmp   #2
         beq   @z1
         cmp   #3
         beq   @z2
         bra   @xyzzyReset
@x       lda   #1
         +HIDE_NEXT_2_BYTES
@y1      lda   #2
         +HIDE_NEXT_2_BYTES
@z1      lda   #3
         +HIDE_NEXT_2_BYTES
@z2      lda   #4
         +HIDE_NEXT_2_BYTES
@xyzzyReset
         lda   #0
         sta   @xyzzyCounter
         bra   @error
@xyzzyCounter
         !byte 0
@xyzzyGo
         jsr   SaveGlobalPreferences
         jsr   ResetPath
         +LDADDR kArtworkRootDirectory
         jsr   AddToPath

         jsr   SetPrefix             ; must set ProDOS prefix to directory where DHGR files actually are
         !word gPathname             ; (DHRSLIDE does not look in subdirectories)
         bcs   @error

         jsr   ResetPath
         +LDADDR kDHRSLIDEFilename
         jsr   AddToPath

         jsr   LoadFile              ; load DHRSLIDE program at $2000
         !word gPathname
         !word kSystemAddress
         !word kProDOSFileBuffer

         jsr   ExitWeeGUI            ; shut down WeeGUI
         jmp   kSystemAddress        ; exit via DHRSLIDE

kDHRSLIDEFilename
         !byte 15
         !raw  "DHRSLIDE.SYSTEM"

;------------------------------------------------------------------------------
; button callbacks
;------------------------------------------------------------------------------
GetCurrentGameIndex
         jsr   okvs_get              ; get shortname of current game
         !word gGlobalPrefsStore
         !word kLastPlayed
         +STAY +
         jsr   okvs_get              ; get numeric index
         !word gGamesListStore
+        !word $FDFD                 ; SMC
         rts                         ; X = index of current game

callback_previous
         jsr   GetCurrentGameIndex
         dex
         bpl   +
         jsr   okvs_len
         !word gGamesListStore
         tax
         dex
+        bra   loadNewGameInfoAndRepaint

callback_next
         jsr   GetCurrentGameIndex
         inx
         stx   @n
         jsr   okvs_len
         !word gGamesListStore
         ldx   @n
@n=*+1
         cmp   #$FD                  ; SMC
         bne   loadNewGameInfoAndRepaint
         ldx   #0

loadNewGameInfoAndRepaint
         stx   +
         jsr   okvs_nth
         !word gGamesListStore
+        !byte $FD                   ; SMC
         +STAY +
         jsr   okvs_update
         !word gGlobalPrefsStore
         !word kLastPlayed
+        !word $FDFD                 ; SMC
         lda   #1
         sta   gGlobalPrefsDirty     ; will trigger a file write later
         sta   gMainScreenPaintDirty ; will trigger a repaint later, in main run loop
         jmp   LoadGameInfo          ; load new game info first