;license:MIT
;(c) 2018 by 4am
;
; Parser for per-game configuration files
;
; Public functions
; - LoadGameInfo
; - CheckForSavedGames
;
; Public variables
; - gHasSavedGames        byte       0=false, nonzero=true (set in CheckForSavedGames)
; - gLastSavedGameSlot    byte       0-7 (only valid if gHasSavedGames=1)
;
; Public constants (keys in gOptionsStore)
; - kHasArtwork
; - kHasHints
; - kHasVersions

kTextRootDirectory
         !byte 5
         !raw "TEXT/"
kHasArtwork
         !byte 7
         !raw  "ARTWORK"
kHasHints
         !byte 5
         !raw  "CLUES"
kHasVersions
         !byte 8
         !raw  "VERSIONS"

gVersionsStore
         !word $FDFD                 ; set in LoadGlobalPreferences
gOptionsStore
         !word $FDFD                 ; set in LoadGameInfo
gHasSavedGames
         !byte $FD                   ; set in CheckForSavedGames
gLastSavedGameSlot
         !byte $FD                   ; set in CheckForSavedGames

sectionPointers                      ; array of pointers to start of each section
addrEOF
         !word $FDFD
addrOptions
         !word $FDFD
addrVersions
         !word $FDFD
addrDescription
         !word $FDFD
addrInfo
         !word $FDFD

;------------------------------------------------------------------------------
; FlushSaveInfo
; update aux data for the current game save-slot if needed
;
; in:    current ProDOS prefix is the same as the PITCH.DARK binary
; out:   all registers and flags clobbered
;------------------------------------------------------------------------------
FlushSaveInfo
         lda   $50
         cmp   #$50
         bne   +
         lda   $51
         cmp   #$44
         bne   +
         dec   $50                   ; prevent re-check in future
         lda   $52
         sta   @slot
         jsr   SetStartupPathToCurrentVersionOfCurrentGame
         ldx   gPathname
         lda   #'S'
         sta   gPathname-1,x
         lda   #'A'
         sta   gPathname,x
         lda   #'V'
         sta   gPathname+1,x
         inc   gPathname
         jsr   SetAuxFileType        ; best-effort
         !word gPathname
@slot    !word 0
+        rts

;------------------------------------------------------------------------------
; LoadGameInfo
; load file with information about the current game
;
; in:    current ProDOS prefix is the same as the PITCH.DARK binary
; out:   addrInfo, addrDescription, addrVersions, addrOptions populated
;        gVersionsStore populated with keys/values in [versions] section
;        gOptionsStore populated with keys/values in [options] section
;        all registers and flags clobbered
;        $00..$05 clobbered
;        $0800..$1FFF clobbered
;------------------------------------------------------------------------------
LoadGameInfo
         jsr   ResetPath
         +LDADDR kTextRootDirectory
         jsr   AddToPath
         jsr   okvs_get
         !word gGlobalPrefsStore
         !word kLastPlayed
         jsr   AddToPath

         jsr   LoadFile
         !word gPathname
         !word kGameInfoBuffer
         !word kProDOSFileBuffer

         +LDADDR (kGameInfoBuffer-1)
         +STAY $FE                   ; ($FE) points to start of data buffer
         ldy   #$00                  ; index into ($FE) pointing to current character
         ldx   #$08                  ; index into sectionPointers array, stores pointer to start of each section

@convertSectionLoop
         jsr   IncAndGetChar
@convertSectionNoInc
         cmp   #$5B                  ; '[' is the start of a new section
         beq   @skipSectionName
         cmp   #$0D                  ; CR -> 0x00 (WeeGUI wants null-terminated strings)
         beq   @null
         cmp   #$5E                  ; '^' -> closed-apple mousetext
         beq   @ca
         cmp   #$26                  ; '&' -> open-apple mousetext
         beq   @oa
         ora   #$80                  ; all other characters -> set high bit
         +HIDE_NEXT_2_BYTES
@null    lda   #$00
         +HIDE_NEXT_2_BYTES
@ca      lda   #$40
         +HIDE_NEXT_2_BYTES
@oa      lda   #$41
         sta   ($FE),y
         bra   @convertSectionLoop

; We found the start of a new section, so skip to the first character on the next line
@skipSectionName
         jsr   IncAndGetChar
         cmp   #$0D                  ; CR
         bne   @skipSectionName
         jsr   IncAndGetChar

; We are at the start of a section, so save this address in the sectionPointers array
         pha
         tya
         clc
         adc   $FE
         sta   sectionPointers,x
         lda   $FF
         bcc   +
         inc
+        sta   sectionPointers+1,x
         pla
         dex
         dex
         bpl   @convertSectionNoInc

; We are done converting the game info file.
; Now handle the individual sections that require further parsing.

         jsr   ParseKeyValueText     ; parse [versions] section into gVersionsStore
         !word gVersionsStore        ; (this handle was initialized in LoadGlobalPreferences)
         !word addrVersions
         !byte 0

         +LDAY SRC
         +STAY gOptionsStore         ; save pointer to free space for next store

         jsr   ParseKeyValueText     ; parse [options] section into gOptionsStore
         !word gOptionsStore
         !word addrOptions
         !byte 0

         +LDAY SRC
         +STAY gSavedGamesStore      ; save pointer to free space for next store

                                     ; execution falls through here
CheckForSavedGames
         jsr   okvs_get              ; get shortname of current game
         !word gGlobalPrefsStore
         !word kLastPlayed
         +STAY +                     ; A/Y contains address

         jsr   okvs_get              ; get selected version of this game
         !word gGlobalPrefsStore
+        !word $FDFD                 ; SMC
         +STAY SRC                   ; A/Y contains address

         lda   (SRC)
         dec
         tay
         phy
-        lda   (SRC),y
         sta   gVal,y
         dey
         bpl   -
         ply
         lda   #$53                  ; add new suffix ('SAV')
         sta   gVal,y
         iny
         lda   #$41
         sta   gVal,y
         iny
         lda   #$56
         sta   gVal,y
         inc   gVal                  ; fix string length

         jsr   ResetPath
         +LDADDR kGameRootDirectory
         jsr   AddToPath
         jsr   okvs_get
         !word gGlobalPrefsStore
         !word kLastPlayed
         jsr   AddToPath
         +LDADDR kPathSeparator
         jsr   AddToPath
         +LDADDR gVal
         jsr   AddToPath
         jsr   GetFileInfo
         !word gPathname
         bcs   @no                   ; no file -> no saved games
         lda   auxtype               ; if low byte of auxtype is $3x, then saved and x is the last save slot
         and   #$F0
         cmp   #$30
         bne   @no
@yes     lda   auxtype
         and   #$0F
         sta   gLastSavedGameSlot
         lda   #1
         +HIDE_NEXT_2_BYTES
@no      lda   #0
         sta   gHasSavedGames
         rts