;license:MIT
;(c) 2018-9 by 4am
;
; HGR title and action slideshows
;
; Public functions
; - HGRTitleSlideshow
; - HGRActionSlideshow
; - HGRSingle
;

HGRTitleSlideshow
         jsr   .LoadHGRTransition    ; load transition effect code at $6000
         jsr   okvs_iter             ; cycle through all listed HGR files
         !word gSlideshowStore
         !word .HGRTitleCallback     ; address of callback (called on each file)
         rts                         ; exit with last picture still visible

HGRActionSlideshow
         jsr   .LoadHGRTransition    ; load transition effect code at $6000
         jsr   okvs_iter             ; cycle through all listed HGR files
         !word gSlideshowStore
         !word .HGRActionCallback    ; address of callback (called on each file)
         rts                         ; exit with last picture still visible

HGRSingle
         +STAY @fname
         jsr   LoadFile              ; load HGR screenshot at $4000
         !word kRootDirectory
@fname   !word $FDFD                 ; SMC
         !word $4000
         jsr   .LoadHGRTransition    ; load transition effect code at $6000
         +LDADDR $6000
         jmp   ExecuteTransitionAndWait

;------------------------------------------------------------------------------
; .HGRTitleCallback [private]
; callback called by okvs_iter on gSlideshowStore
; to load and display a single HGR title screenshot

; in:    A/Y contains address of filename (name only, path is always /TITLE.HGR/)
;        X contains 0-based index of the current record in gSlideshowStore
; out:   all registers and flags clobbered
;        $0800..$1EFF preserved (this contains the gSlideshowStore OKVS data)
;        $2000..$BFFF clobbered by graphics data and transition code
;------------------------------------------------------------------------------
.HGRTitleCallback
         bit   KBD
         bpl   +
@exit    rts
+
         +STAY @tfname

         ; find this game in gGamesListStore
         ldx   #$60
         jsr   GetGameDisplayName
         ; if game is not found (C will be set here), it means it can't be played on
         ; this machine due to memory or joystick requirements, so we don't display
         ; it in slideshows
         bcs   @exit
         stx   gGameToLaunch

         jsr   LoadFile              ; load HGR screenshot at $4000
         !word kHGRTitleDirectory
@tfname  !word $FDFD                 ; SMC
         !word $4000

         +LDADDR $6000
         jmp   ExecuteTransitionAndWait

;------------------------------------------------------------------------------
; .HGRActionCallback [private]
; callback called by okvs_iter on gSlideshowStore
; to load and display a single HGR action screenshot

; in:    A/Y contains address of filename (name only, path is always /ACTION.HGR/)
;        X contains 0-based index of the current record in gSlideshowStore
;        gGamesListStore must be initialized
; out:   all registers and flags clobbered
;        $0800..$1EFF preserved (this contains the gSlideshowStore OKVS data)
;        $2000..$BFFF clobbered by graphics data and transition code
;------------------------------------------------------------------------------
.HGRActionCallback
         bit   KBD
         bpl   +
@actionExit
         rts
+
         +STAY @afname

         ; find this game in gGamesListStore or gSlideshowStore
         ldx   #$EA
         jsr   GetGameDisplayName
         ; if game name is not found (C will be set here), it means the game
         ; can't be played due to memory or joystick requirements, so we hide
         ; it from slideshows
         bcs   @actionExit

         ; found the game
         +STAY SAVE
         stx   gGameToLaunch

         jsr   LoadFile              ; load HGR screenshot at $4000
         !word kHGRActionDirectory
@afname  !word $FDFD                 ; SMC
         !word $4000

         ; display game name in the bottom-left corner
         ldx   #39
         lda   #0
-        sta   UILine1,x
         dex
         bpl   -
         sta   HTAB
         ldx   #22
         stx   VTAB
         tay
         lda   (SAVE),y
         tax
         +LDADDR UILine1
         sec
         jsr   DrawBuffer
         ldx   #3
         +LDADDR @toprightcorner
         sec
         jsr   DrawBuffer
         inc   VTAB
         ldx   #0
         stx   HTAB
         inx
         +LDADDR @rightline
         sec
         jsr   DrawBuffer
         +LDAY SAVE
         jsr   SetPath
         +LDADDR gPathname
         sec
         jsr   DrawString
         ldx   #2
         +LDADDR @rightline
         sec
         jsr   DrawBuffer

         +LDADDR $6000
         jmp   ExecuteTransitionAndWait
@toprightcorner
         !byte 0,0,7
@rightline
         !text " "
         !byte 3

;------------------------------------------------------------------------------
; .LoadHGRTransition [private]
; looks up name of next HGR transition effect in FX.CONF and loads that file
; at $6000

; in:    gGlobalPrefsStore has been initialized
; out:   all registers and flags clobbered
;        $6000..$BFFF contains transition effect code
;------------------------------------------------------------------------------
.LoadHGRTransition
         jsr   LoadFile              ; load HGR transition effects list into $8000
         !word kRootDirectory
         !word kFXConfFile
-        !word $8000
         jsr   ParseKeyValueList     ; parse HGR transition effects list into $6000
         !word gFXStore
         !word -
         !byte 0

         jsr   pref_get              ; get HGR transition effect from prefs
         !word kNextFX
         !word gFXStore
         +STAY @filename             ; A/Y = filename (don't load file yet)
                                     ; X = index of the transition in FX store
         +LDADDR gFXStore
         jsr   okvs_next             ; get transition after this one
         +STAY +

         jsr   pref_set              ; update prefs store and save to disk
         !word kNextFX
+        !word $FDFD                 ; SMC

         jsr   LoadFile              ; now load transition effect code into $6000
         !word kFXDirectory
@filename !word $FDFD                ; SMC
         !word $6000
         rts