puzcoord EQUS "* 6 +"
PUZZLE_BORDER EQU $ee
PUZZLE_VOID   EQU $ef

FossilPuzzle:
	ld a, [hInMenu]
	push af
	ld a, 1
	ld [hInMenu], a
	call ClearBGPalettes
	call ClearTileMap
	call ClearSprites
	xor a
	ld [hBGMapMode], a
	call DisableLCD
	ld hl, wMisc
	ld bc, wMiscEnd - wMisc
	xor a
	call ByteFill
	ld hl, FossilPuzzleCursorGFX
	ld de, vFontTiles tile $60
	ld bc, 4 tiles
	rst CopyBytes
	ld hl, FossilPuzzleStartCancelLZ
	ld de, vFontTiles tile $6d
	call Decompress
	call LoadFossilPuzzlePiecesGFX
	hlcoord 0, 0
	ld bc, SCREEN_WIDTH * SCREEN_HEIGHT
	ld a, PUZZLE_BORDER
	call ByteFill
	hlcoord 4, 3
	lb bc, 12, 12
	ld a, PUZZLE_VOID
	call FossilPuzzle_FillBox
	call InitFossilPuzzlePiecePositions
	call FossilPuzzle_UpdateTilemap
	call PlaceStartCancelBox
	xor a
	ld [hSCY], a
	ld [hSCX], a
	ld [rWY], a
	ld [wJumptableIndex], a
	ld [wHoldingFossilPuzzlePiece], a
	ld [wFossilPuzzleCursorPosition], a
	ld [wFossilPuzzleHeldPiece], a
	call EnableLCD
	ld a, $93
	ld [rLCDC], a
	call ApplyTilemapInVBlank
	ld b, SCGB_18
	predef GetSGBLayout
	ld a, $e4
	call DmgToCgbBGPals
	ld a, $24
	call DmgToCgbObjPal0
	xor a
	ld [wSolvedFossilPuzzle], a
	call DelayFrame
.loop
	call JoyTextDelay
	ld a, [wJumptableIndex]
	bit 7, a
	jr nz, .quit
	call FossilPuzzleJumptable
	ld a, [wHoldingFossilPuzzlePiece]
	and a
	jr nz, .holding_piece
	ld a, [hVBlankCounter]
	and $10
	jr z, .clear
.holding_piece
	call RedrawFossilPuzzlePieces
	jr .next

.clear
	call ClearSprites
.next
	call DelayFrame
	jr .loop

.quit
	pop af
	ld [hInMenu], a
	call ClearBGPalettes
	call ClearTileMap
	call ClearSprites
	call EnableLCD
	ld a, $e3
	ld [rLCDC], a
	ret

InitFossilPuzzlePiecePositions:
	lb bc, 16, 1
.load_loop
	call Random
	and $f
	ld hl, .PuzzlePieceInitialPositions
	ld e, a
	ld d, 0
	add hl, de
	ld e, [hl]
	ld hl, wPuzzlePieces
	add hl, de
	ld a, [hl]
	and a
	jr nz, .load_loop
	ld [hl], c
	inc c
	dec b
	jr nz, .load_loop
	ret

.PuzzlePieceInitialPositions
initpuzcoord: MACRO
rept _NARG / 2
	db \1 puzcoord \2
	shift
	shift
endr
ENDM
	initpuzcoord 0,0, 0,1, 0,2, 0,3, 0,4, 0,5
	initpuzcoord 1,0,                     1,5
	initpuzcoord 2,0,                     2,5
	initpuzcoord 3,0,                     3,5
	initpuzcoord 4,0,                     4,5
	initpuzcoord 5,0,                     5,5
	; START > CANCEL

PlaceStartCancelBox:
	call PlaceStartCancelBoxBorder
	hlcoord 5, 16
	ld a, $f6
	ld c, 10
.loop
	ld [hli], a
	inc a
	dec c
	jr nz, .loop
	ret

PlaceStartCancelBoxBorder:
	hlcoord 4, 15
	ld a, $f0
	ld [hli], a
	ld bc, 10
	inc a
	call ByteFill
	hlcoord 15, 15
	ld a, $f2
	ld [hli], a
	hlcoord 4, 16
	inc a
	ld [hli], a
	ld bc, 10
	ld a, $ef
	call ByteFill
	hlcoord 15, 16
	ld a, $f3
	ld [hli], a
	hlcoord 4, 17
	inc a
	ld [hli], a
	ld bc, 10
	ld a, $f1
	call ByteFill
	hlcoord 15, 17
	ld a, $f5
	ld [hl], a
	ret

FossilPuzzleJumptable:
	ld a, [hJoyPressed]
	and A_BUTTON
	jp nz, FossilPuzzle_A
	ld hl, hJoyLast
	bit D_UP_F, [hl]
	jr nz, .d_up
	bit D_DOWN_F, [hl]
	jr nz, .d_down
	bit D_LEFT_F, [hl]
	jr nz, .d_left
	bit D_RIGHT_F, [hl]
	jr nz, .d_right
	bit START_F, [hl]
	jr nz, .start
	ret

.d_up
	ld hl, wFossilPuzzleCursorPosition
	ld a, [hl]
	cp 1 puzcoord 0
	ret c
	sub $6
	ld [hl], a
	jr .done_joypad

.d_down
	ld hl, wFossilPuzzleCursorPosition
	ld a, [hl]
	cp 4 puzcoord 1
	ret z
	cp 4 puzcoord 2
	ret z
	cp 4 puzcoord 3
	ret z
	cp 4 puzcoord 4
	ret z
	cp 5 puzcoord 0
	ret nc
	add $6
	ld [hl], a
	jr .done_joypad

.d_left
	ld hl, wFossilPuzzleCursorPosition
	ld a, [hl]
	and a
	ret z
	cp 1 puzcoord 0
	ret z
	cp 2 puzcoord 0
	ret z
	cp 3 puzcoord 0
	ret z
	cp 4 puzcoord 0
	ret z
	cp 5 puzcoord 0
	ret z
	cp 5 puzcoord 5
	jr z, .left_overflow
	dec [hl]
	jr .done_joypad

.left_overflow
	ld [hl], 5 puzcoord 0
	jr .done_joypad

.d_right
	ld hl, wFossilPuzzleCursorPosition
	ld a, [hl]
	cp 0 puzcoord 5
	ret z
	cp 1 puzcoord 5
	ret z
	cp 2 puzcoord 5
	ret z
	cp 3 puzcoord 5
	ret z
	cp 4 puzcoord 5
	ret z
	cp 5 puzcoord 5
	ret z
	cp 5 puzcoord 0
	jr z, .right_overflow
	inc [hl]
	jr .done_joypad

.start
	jp FossilPuzzle_Quit

.right_overflow
	ld [hl], 5 puzcoord 5

.done_joypad
	ld a, [wHoldingFossilPuzzlePiece]
	and a
	jr nz, .holding_piece
	ld de, SFX_POUND
	jr .play_sfx

.holding_piece
	ld de, SFX_MOVE_PUZZLE_PIECE

.play_sfx
	jp PlaySFX

FossilPuzzle_A:
	ld a, [wHoldingFossilPuzzlePiece]
	and a
	jr nz, .TryPlacePiece
	call FossilPuzzle_CheckCurrentTileOccupancy
	and a
	jr z, FossilPuzzle_InvalidAction
	ld de, SFX_MEGA_KICK
	call PlaySFX
	ld [hl], 0
	ld [wFossilPuzzleHeldPiece], a
	call RedrawFossilPuzzlePieces
	call FillUnoccupiedPuzzleSpace
	call ApplyTilemapInVBlank
	call WaitSFX
	ld a, TRUE
	ld [wHoldingFossilPuzzlePiece], a
	ret

.TryPlacePiece
	call FossilPuzzle_CheckCurrentTileOccupancy
	and a
	jr nz, FossilPuzzle_InvalidAction
	ld de, SFX_PLACE_PUZZLE_PIECE_DOWN
	call PlaySFX
	ld a, [wFossilPuzzleHeldPiece]
	ld [hl], a
	call PlaceFossilPuzzlePieceGFX
	call ApplyTilemapInVBlank
	xor a
	ld [wFossilPuzzleHeldPiece], a
	call RedrawFossilPuzzlePieces
	xor a
	ld [wHoldingFossilPuzzlePiece], a
	call WaitSFX
	call CheckSolvedFossilPuzzle
	ret nc

; You solved the puzzle!
	call PlaceStartCancelBoxBorder
	call ClearSprites
	ld de, SFX_1ST_PLACE
	call PlayWaitSFX
	call SimpleWaitPressAorB
	ld a, TRUE
	ld [wSolvedFossilPuzzle], a
FossilPuzzle_Quit:
	ld hl, wJumptableIndex
	set 7, [hl]
	ret

FossilPuzzle_InvalidAction:
	ld de, SFX_WRONG
	call PlaySFX
	ld c, 10
	jp DelayFrames

FossilPuzzle_FillBox:
	ld de, SCREEN_WIDTH
.row
	push bc
	push hl
.col
	ld [hli], a
	dec c
	jr nz, .col
	pop hl
	add hl, de
	pop bc
	dec b
	jr nz, .row
	ret

FossilPuzzle_UpdateTilemap:
	xor a
	ld [wFossilPuzzleCursorPosition], a
	ld c, 6 * 6
.loop
	push bc
	call FossilPuzzle_CheckCurrentTileOccupancy
	ld [wFossilPuzzleHeldPiece], a
	and a
	jr z, .not_holding_piece
	call PlaceFossilPuzzlePieceGFX
	jr .next

.not_holding_piece
	call FillUnoccupiedPuzzleSpace

.next
	ld hl, wFossilPuzzleCursorPosition
	inc [hl]
	pop bc
	dec c
	jr nz, .loop
	ret

PlaceFossilPuzzlePieceGFX:
	ld a, 2 ; tilemap coords
	call GetFossilPuzzleCoordData
	ld a, [hli]
	ld h, [hl]
	ld l, a
	push hl
	call GetCurrentPuzzlePieceVTileCorner
	pop hl
	ld de, SCREEN_WIDTH
	ld b, 3
.row
	ld c, 3
	push hl
.col
	ld [hli], a
	inc a
	dec c
	jr nz, .col
	add 9
	pop hl
	add hl, de
	dec b
	jr nz, .row
	ret

FillUnoccupiedPuzzleSpace:
	ld a, 2 ; tilemap coords
	call GetFossilPuzzleCoordData
	ld a, [hli]
	ld h, [hl]
	ld l, a
	push hl
	ld a, 4 ; tile
	call GetFossilPuzzleCoordData
	ld a, [hl]
	pop hl
	ld de, SCREEN_WIDTH
	ld b, 3
.row
	ld c, 3
	push hl
.col
	ld [hli], a
	dec c
	jr nz, .col
	pop hl
	add hl, de
	dec b
	jr nz, .row
	ret

GetFossilPuzzleCoordData:
	ld e, a
	ld d, 0
	ld hl, FossilPuzzleCoordData
	add hl, de
	ld a, [wFossilPuzzleCursorPosition]
	ld e, a
rept 6
	add hl, de
endr
	ret

FossilPuzzle_CheckCurrentTileOccupancy:
	ld hl, wPuzzlePieces
	ld a, [wFossilPuzzleCursorPosition]
	ld e, a
	ld d, 0
	add hl, de
	ld a, [hl]
	ret

GetCurrentPuzzlePieceVTileCorner:
	ld a, [wFossilPuzzleHeldPiece]
	ld hl, .Corners
	add l
	ld l, a
	ld a, 0
	adc h
	ld h, a
	ld a, [hl]
	ret

.Corners:
; 00, 01, 02
; 0c, 0d, 0e
; 18, 19, 1a
	db $e0 ; no piece selected
	db $00, $03, $06, $09
	db $24, $27, $2a, $2d
	db $48, $4b, $4e, $51
	db $6c, $6f, $72, $75

CheckSolvedFossilPuzzle:
	ld hl, .SolvedPuzzleConfiguration
	ld de, wPuzzlePieces
	ld c, 6 * 6
.loop
	ld a, [de]
	cp [hl]
	jr nz, .not_solved
	inc de
	inc hl
	dec c
	jr nz, .loop
	scf
	ret

.not_solved
	and a
	ret

.SolvedPuzzleConfiguration
	db $00, $00, $00, $00, $00, $00
	db $00, $01, $02, $03, $04, $00
	db $00, $05, $06, $07, $08, $00
	db $00, $09, $0a, $0b, $0c, $00
	db $00, $0d, $0e, $0f, $10, $00
	db $00, $00, $00, $00, $00, $00

RedrawFossilPuzzlePieces:
	call GetCurrentPuzzlePieceVTileCorner
	ld [wd002], a
	xor a
	call GetFossilPuzzleCoordData ; get pixel positions
	ld a, [hli]
	ld b, [hl]
	ld c, a
	ld a, [wd002]
	cp $e0
	jr z, .NoPiece
	ld hl, .OAM_HoldingPiece
	jr .load

.NoPiece
	ld hl, .OAM_NotHoldingPiece

.load
	ld de, wSprites
.loop
	ld a, [hli]
	cp -1
	ret z
	add b
	ld [de], a
	inc de
	ld a, [hli]
	add c
	ld [de], a
	inc de
	ld a, [wd002]
	add [hl]
	ld [de], a
	inc hl
	inc de
	ld a, [hli]
	ld [de], a
	inc de
	jr .loop

.OAM_HoldingPiece
	dsprite -1, -4, -1, -4, $00, $00
	dsprite -1, -4,  0, -4, $01, $00
	dsprite -1, -4,  0,  4, $02, $00
	dsprite  0, -4, -1, -4, $0c, $00
	dsprite  0, -4,  0, -4, $0d, $00
	dsprite  0, -4,  0,  4, $0e, $00
	dsprite  0,  4, -1, -4, $18, $00
	dsprite  0,  4,  0, -4, $19, $00
	dsprite  0,  4,  0,  4, $1a, $00
	db -1

.OAM_NotHoldingPiece
	dsprite -1, -4, -1, -4, $00, $00
	dsprite -1, -4,  0, -4, $01, $00
	dsprite -1, -4,  0,  4, $00, $20 ; xflip
	dsprite  0, -4, -1, -4, $02, $00
	dsprite  0, -4,  0, -4, $03, $00
	dsprite  0, -4,  0,  4, $02, $20 ; xflip
	dsprite  0,  4, -1, -4, $00, $40 ; yflip
	dsprite  0,  4,  0, -4, $01, $40 ; yflip
	dsprite  0,  4,  0,  4, $00, $60 ; xflip, yflip
	db -1

FossilPuzzleCoordData:

puzzle_coords: MACRO
	dbpixel \1, \2, \3, \4
	dwcoord \5, \6
	db \7, \8
ENDM
; OAM coords, tilemap coords, vacant tile, filler
	puzzle_coords  3,  3, 4, 4,  1,  0, PUZZLE_BORDER, 0
	puzzle_coords  6,  3, 4, 4,  4,  0, PUZZLE_BORDER, 0
	puzzle_coords  9,  3, 4, 4,  7,  0, PUZZLE_BORDER, 0
	puzzle_coords 12,  3, 4, 4, 10,  0, PUZZLE_BORDER, 0
	puzzle_coords 15,  3, 4, 4, 13,  0, PUZZLE_BORDER, 0
	puzzle_coords 18,  3, 4, 4, 16,  0, PUZZLE_BORDER, 0

	puzzle_coords  3,  6, 4, 4,  1,  3, PUZZLE_BORDER, 0
	puzzle_coords  6,  6, 4, 4,  4,  3, PUZZLE_VOID,   0
	puzzle_coords  9,  6, 4, 4,  7,  3, PUZZLE_VOID,   0
	puzzle_coords 12,  6, 4, 4, 10,  3, PUZZLE_VOID,   0
	puzzle_coords 15,  6, 4, 4, 13,  3, PUZZLE_VOID,   0
	puzzle_coords 18,  6, 4, 4, 16,  3, PUZZLE_BORDER, 0

	puzzle_coords  3,  9, 4, 4,  1,  6, PUZZLE_BORDER, 0
	puzzle_coords  6,  9, 4, 4,  4,  6, PUZZLE_VOID,   0
	puzzle_coords  9,  9, 4, 4,  7,  6, PUZZLE_VOID,   0
	puzzle_coords 12,  9, 4, 4, 10,  6, PUZZLE_VOID,   0
	puzzle_coords 15,  9, 4, 4, 13,  6, PUZZLE_VOID,   0
	puzzle_coords 18,  9, 4, 4, 16,  6, PUZZLE_BORDER, 0

	puzzle_coords  3, 12, 4, 4,  1,  9, PUZZLE_BORDER, 0
	puzzle_coords  6, 12, 4, 4,  4,  9, PUZZLE_VOID,   0
	puzzle_coords  9, 12, 4, 4,  7,  9, PUZZLE_VOID,   0
	puzzle_coords 12, 12, 4, 4, 10,  9, PUZZLE_VOID,   0
	puzzle_coords 15, 12, 4, 4, 13,  9, PUZZLE_VOID,   0
	puzzle_coords 18, 12, 4, 4, 16,  9, PUZZLE_BORDER, 0

	puzzle_coords  3, 15, 4, 4,  1, 12, PUZZLE_BORDER, 0
	puzzle_coords  6, 15, 4, 4,  4, 12, PUZZLE_VOID,   0
	puzzle_coords  9, 15, 4, 4,  7, 12, PUZZLE_VOID,   0
	puzzle_coords 12, 15, 4, 4, 10, 12, PUZZLE_VOID,   0
	puzzle_coords 15, 15, 4, 4, 13, 12, PUZZLE_VOID,   0
	puzzle_coords 18, 15, 4, 4, 16, 12, PUZZLE_BORDER, 0

	puzzle_coords  3, 18, 4, 4,  1, 15, PUZZLE_BORDER, 0
	puzzle_coords  6, 18, 4, 4,  4, 15, PUZZLE_BORDER, 0
	puzzle_coords  9, 18, 4, 4,  7, 15, PUZZLE_BORDER, 0
	puzzle_coords 12, 18, 4, 4, 10, 15, PUZZLE_BORDER, 0
	puzzle_coords 15, 18, 4, 4, 13, 15, PUZZLE_BORDER, 0
	puzzle_coords 18, 18, 4, 4, 16, 15, PUZZLE_BORDER, 0

ConvertLoadedPuzzlePieces:
	ld hl, vBGTiles
	ld de, vObjTiles
	ld b, 6
.loop
	push bc
	push hl
	push hl
	call .EnlargePuzzlePieceTiles
	pop hl
	ld bc, 1 tiles / 2
	add hl, bc
	call .EnlargePuzzlePieceTiles
	pop hl
	ld bc, 6 tiles
	add hl, bc
	pop bc
	dec b
	jr nz, .loop
	jp FossilPuzzle_AddPuzzlePieceBorders

.EnlargePuzzlePieceTiles
; double size
	ld c, 6
.loop1
	push bc
	push hl
	push hl
	ld c, 4
.loop2
	push bc
	ld a, [hli]
	and $f0
	swap a
	call .GetEnlargedTile
	ld c, a
	ld a, [hli]
	and $f0
	swap a
	call .GetEnlargedTile
	ld b, a
	ld a, c
	ld [de], a
	inc de
	ld a, b
	ld [de], a
	inc de
	ld a, c
	ld [de], a
	inc de
	ld a, b
	ld [de], a
	inc de
	pop bc
	dec c
	jr nz, .loop2
	pop hl
	ld c, 4
.loop3
	push bc
	ld a, [hli]
	and $f
	call .GetEnlargedTile
	ld c, a
	ld a, [hli]
	and $f
	call .GetEnlargedTile
	ld b, a
	ld a, c
	ld [de], a
	inc de
	ld a, b
	ld [de], a
	inc de
	ld a, c
	ld [de], a
	inc de
	ld a, b
	ld [de], a
	inc de
	pop bc
	dec c
	jr nz, .loop3
	pop hl
	ld bc, 1 tiles
	add hl, bc
	pop bc
	dec c
	jr nz, .loop1
	ret

.GetEnlargedTile
	push hl
	ld hl, .EnlargedTiles
	add l
	ld l, a
	ld a, 0
	adc h
	ld h, a
	ld a, [hl]
	pop hl
	ret

.EnlargedTiles

x = 0
rept 16
	db ((x & %1000) * %11000) + ((x & %0100) * %1100) + ((x & %0010) * %110) + ((x & %0001) * %11)
x = x + 1
endr

FossilPuzzle_AddPuzzlePieceBorders: ; e16c7
	ld hl, GFXHeaders
	ld a, 8
.loop
	push af
	push hl
	ld a, [hli]
	ld e, a
	ld a, [hli]
	ld d, a
	ld a, [hli]
	ld h, [hl]
	ld l, a
	call .LoadGFX
	pop hl
rept 4
	inc hl
endr
	pop af
	dec a
	jr nz, .loop
	ret

.LoadGFX
	lb bc, 4, 4
.loop1
	push bc

.loop2
	push de
	push hl

	ld b, 1 tiles
.loop3
	ld a, [de]
	or [hl]
	ld [hli], a
	inc de
	dec b
	jr nz, .loop3

	pop hl
	ld de, 3 tiles
	add hl, de
	pop de
	dec c
	jr nz, .loop2

	ld bc, 24 tiles
	add hl, bc
	pop bc
	dec b
	jr nz, .loop1
	ret

GFXHeaders:
	dw .TileBordersGFX + 0 tiles, vObjTiles tile $00
	dw .TileBordersGFX + 1 tiles, vObjTiles tile $01
	dw .TileBordersGFX + 2 tiles, vObjTiles tile $02
	dw .TileBordersGFX + 3 tiles, vObjTiles tile $0c
	dw .TileBordersGFX + 4 tiles, vObjTiles tile $0e
	dw .TileBordersGFX + 5 tiles, vObjTiles tile $18
	dw .TileBordersGFX + 6 tiles, vObjTiles tile $19
	dw .TileBordersGFX + 7 tiles, vObjTiles tile $1a

.TileBordersGFX: INCBIN "gfx/fossil_puzzle/tile_borders.2bpp"

LoadFossilPuzzlePiecesGFX:
	ld a, [hScriptVar]
	and 3
	ld e, a
	ld d, 0
	ld hl, .LZPointers
	add hl, de
	add hl, de
	ld a, [hli]
	ld h, [hl]
	ld l, a
	ld de, vBGTiles
	call Decompress
	jp ConvertLoadedPuzzlePieces

.LZPointers
	dw LileepPuzzleLZ
	dw AnorithPuzzleLZ
	dw CranidosPuzzleLZ
	dw ShieldonPuzzleLZ

FossilPuzzleCursorGFX: INCBIN "gfx/fossil_puzzle/cursor.2bpp"
FossilPuzzleStartCancelLZ: INCBIN "gfx/fossil_puzzle/start_cancel.2bpp.lz"

LileepPuzzleLZ: INCBIN "gfx/fossil_puzzle/lileep.2bpp.lz"
AnorithPuzzleLZ: INCBIN "gfx/fossil_puzzle/anorith.2bpp.lz"
CranidosPuzzleLZ: INCBIN "gfx/fossil_puzzle/cranidos.2bpp.lz"
ShieldonPuzzleLZ: INCBIN "gfx/fossil_puzzle/shieldon.2bpp.lz"
