PUZZLE_BORDER EQU $ee
PUZZLE_VOID   EQU $ef

puzcoord EQUS "* 6 +"

_UnownPuzzle:
	ldh a, [hInMenu]
	push af
	ld a, $1
	ldh [hInMenu], a
	call ClearBGPalettes
	call ClearTilemap
	call ClearSprites
	xor a
	ldh [hBGMapMode], a
	call DisableLCD
	ld hl, wUnownPuzzle ; includes wPuzzlePieces
	ld bc, wUnownPuzzleEnd - wUnownPuzzle
	xor a
	call ByteFill
	ld hl, UnownPuzzleCursorGFX
	ld de, vTiles0 tile $e0
	ld bc, 4 tiles
	call CopyBytes
	ld hl, UnownPuzzleStartCancelLZ
	ld de, vTiles0 tile $ed
	call Decompress
	call LoadUnownPuzzlePiecesGFX
	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 UnownPuzzle_FillBox
	call InitUnownPuzzlePiecePositions
	call UnownPuzzle_UpdateTilemap
	call PlaceStartCancelBox
	xor a
	ldh [hSCY], a
	ldh [hSCX], a
	ldh [rWY], a
	ld [wJumptableIndex], a
	ld [wHoldingUnownPuzzlePiece], a
	ld [wUnownPuzzleCursorPosition], a
	ld [wUnownPuzzleHeldPiece], a
	ld a, %10010011
	ldh [rLCDC], a
	call WaitBGMap
	ld b, SCGB_UNOWN_PUZZLE
	call GetSGBLayout
	ld a, $e4
	call DmgToCgbBGPals
	ld a, $24
	call DmgToCgbObjPal0
	xor a
	ld [wSolvedUnownPuzzle], a
	call DelayFrame
.loop
	call JoyTextDelay
	ld a, [wJumptableIndex]
	bit 7, a
	jr nz, .quit
	call UnownPuzzleJumptable
	ld a, [wHoldingUnownPuzzlePiece]
	and a
	jr nz, .holding_piece
	ldh a, [hVBlankCounter]
	and $10
	jr z, .clear
.holding_piece
	call RedrawUnownPuzzlePieces
	jr .next

.clear
	call ClearSprites
.next
	call DelayFrame
	jr .loop

.quit
	pop af
	ldh [hInMenu], a
	call ClearBGPalettes
	call ClearTilemap
	call ClearSprites
	ld a, LCDC_DEFAULT
	ldh [rLCDC], a
	ret

InitUnownPuzzlePiecePositions:
	ld c, 1
	ld b, 16
.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 2
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
	ld a, $f1
	call ByteFill
	hlcoord 15, 15
	ld a, $f2
	ld [hli], a
	hlcoord 4, 16
	ld a, $f3
	ld [hli], a
	ld bc, 10
	ld a, PUZZLE_VOID
	call ByteFill
	hlcoord 15, 16
	ld a, $f3
	ld [hli], a
	hlcoord 4, 17
	ld a, $f4
	ld [hli], a
	ld bc, 10
	ld a, $f1
	call ByteFill
	hlcoord 15, 17
	ld a, $f5
	ld [hl], a
	ret

UnownPuzzleJumptable:
	jumptable .Jumptable, wJumptableIndex

.Jumptable: ; redundant one-entry jumptable
	dw .Function

.Function:
	ldh a, [hJoyPressed]
	and START
	jp nz, UnownPuzzle_Quit
	ldh a, [hJoyPressed]
	and A_BUTTON
	jp nz, UnownPuzzle_A
	ld hl, hJoyLast
	ld a, [hl]
	and D_UP
	jr nz, .d_up
	ld a, [hl]
	and D_DOWN
	jr nz, .d_down
	ld a, [hl]
	and D_LEFT
	jr nz, .d_left
	ld a, [hl]
	and D_RIGHT
	jr nz, .d_right
	ret

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

.d_down
	ld hl, wUnownPuzzleCursorPosition
	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, wUnownPuzzleCursorPosition
	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, wUnownPuzzleCursorPosition
	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

.right_overflow
	ld [hl], 5 puzcoord 5

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

.holding_piece
	ld de, SFX_MOVE_PUZZLE_PIECE

.play_sfx
	call PlaySFX
	ret

UnownPuzzle_A:
	ld a, [wHoldingUnownPuzzlePiece]
	and a
	jr nz, .TryPlacePiece
	call UnownPuzzle_CheckCurrentTileOccupancy
	and a
	jr z, UnownPuzzle_InvalidAction
	ld de, SFX_MEGA_KICK
	call PlaySFX
	ld [hl], 0
	ld [wUnownPuzzleHeldPiece], a
	call RedrawUnownPuzzlePieces
	call FillUnoccupiedPuzzleSpace
	call WaitBGMap
	call WaitSFX
	ld a, TRUE
	ld [wHoldingUnownPuzzlePiece], a
	ret

.TryPlacePiece:
	call UnownPuzzle_CheckCurrentTileOccupancy
	and a
	jr nz, UnownPuzzle_InvalidAction
	ld de, SFX_PLACE_PUZZLE_PIECE_DOWN
	call PlaySFX
	ld a, [wUnownPuzzleHeldPiece]
	ld [hl], a
	call PlaceUnownPuzzlePieceGFX
	call WaitBGMap
	xor a
	ld [wUnownPuzzleHeldPiece], a
	call RedrawUnownPuzzlePieces
	xor a
	ld [wHoldingUnownPuzzlePiece], a
	call WaitSFX
	call CheckSolvedUnownPuzzle
	ret nc

; You solved the puzzle!
	call PlaceStartCancelBoxBorder
	call ClearSprites
	ld de, SFX_1ST_PLACE
	call PlaySFX
	call WaitSFX
	call SimpleWaitPressAorB
	ld a, TRUE
	ld [wSolvedUnownPuzzle], a
UnownPuzzle_Quit:
	ld hl, wJumptableIndex
	set 7, [hl]
	ret

UnownPuzzle_InvalidAction:
	ld de, SFX_WRONG
	call PlaySFX
	call WaitSFX
	ret

UnownPuzzle_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

UnownPuzzle_UpdateTilemap:
	xor a
	ld [wUnownPuzzleCursorPosition], a
	ld c, 6 * 6
.loop
	push bc
	call UnownPuzzle_CheckCurrentTileOccupancy
	ld [wUnownPuzzleHeldPiece], a
	and a
	jr z, .not_holding_piece
	call PlaceUnownPuzzlePieceGFX
	jr .next

.not_holding_piece
	call FillUnoccupiedPuzzleSpace

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

PlaceUnownPuzzlePieceGFX:
	ld a, $2 ; tilemap coords
	call GetUnownPuzzleCoordData
	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 GetUnownPuzzleCoordData
	ld a, [hli]
	ld h, [hl]
	ld l, a
	push hl
	ld a, 4 ; tile
	call GetUnownPuzzleCoordData
	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

GetUnownPuzzleCoordData:
	ld e, a
	ld d, 0
	ld hl, UnownPuzzleCoordData
	add hl, de
	ld a, [wUnownPuzzleCursorPosition]
	ld e, a
rept 6
	add hl, de
endr
	ret

UnownPuzzle_CheckCurrentTileOccupancy:
	ld hl, wPuzzlePieces
	ld a, [wUnownPuzzleCursorPosition]
	ld e, a
	ld d, $0
	add hl, de
	ld a, [hl]
	ret

GetCurrentPuzzlePieceVTileCorner:
	ld a, [wUnownPuzzleHeldPiece]
	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

CheckSolvedUnownPuzzle:
	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

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

.NoPiece:
	ld hl, .OAM_NotHoldingPiece

.load
	ld de, wVirtualOAMSprite00
.loop
	ld a, [hli]
	cp -1
	ret z
	add b
	ld [de], a ; y
	inc de
	ld a, [hli]
	add c
	ld [de], a ; x
	inc de
	ld a, [wUnownPuzzleCornerTile]
	add [hl]
	ld [de], a ; tile id
	inc hl
	inc de
	ld a, [hli]
	ld [de], a ; attributes
	inc de
	jr .loop

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

.OAM_NotHoldingPiece:
	dbsprite -1, -1, -4, -4, $00, 0
	dbsprite  0, -1, -4, -4, $01, 0
	dbsprite  0, -1,  4, -4, $00, 0 | X_FLIP
	dbsprite -1,  0, -4, -4, $02, 0
	dbsprite  0,  0, -4, -4, $03, 0
	dbsprite  0,  0,  4, -4, $02, 0 | X_FLIP
	dbsprite -1,  0, -4,  4, $00, 0 | Y_FLIP
	dbsprite  0,  0, -4,  4, $01, 0 | Y_FLIP
	dbsprite  0,  0,  4,  4, $00, 0 | X_FLIP | Y_FLIP
	db -1

UnownPuzzleCoordData:

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, vTiles2
	ld de, vTiles0
	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
	call UnownPuzzle_AddPuzzlePieceBorders
	ret

.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

UnownPuzzle_AddPuzzlePieceBorders:
	ld hl, PuzzlePieceBorderData
	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

PuzzlePieceBorderData:
	dw .TileBordersGFX + 0 tiles, vTiles0 tile $00
	dw .TileBordersGFX + 1 tiles, vTiles0 tile $01
	dw .TileBordersGFX + 2 tiles, vTiles0 tile $02
	dw .TileBordersGFX + 3 tiles, vTiles0 tile $0c
	dw .TileBordersGFX + 4 tiles, vTiles0 tile $0e
	dw .TileBordersGFX + 5 tiles, vTiles0 tile $18
	dw .TileBordersGFX + 6 tiles, vTiles0 tile $19
	dw .TileBordersGFX + 7 tiles, vTiles0 tile $1a

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

LoadUnownPuzzlePiecesGFX:
	ld a, [wScriptVar]
	maskbits NUM_UNOWN_PUZZLES
	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, vTiles2
	call Decompress
	call ConvertLoadedPuzzlePieces
	ret

.LZPointers:
; entries correspond to UNOWNPUZZLE_* constants
	dw KabutoPuzzleLZ
	dw OmanytePuzzleLZ
	dw AerodactylPuzzleLZ
	dw HoOhPuzzleLZ

UnownPuzzleCursorGFX:
INCBIN "gfx/unown_puzzle/cursor.2bpp"

UnownPuzzleStartCancelLZ:
INCBIN "gfx/unown_puzzle/start_cancel.2bpp.lz"

HoOhPuzzleLZ:
INCBIN "gfx/unown_puzzle/hooh.2bpp.lz"

AerodactylPuzzleLZ:
INCBIN "gfx/unown_puzzle/aerodactyl.2bpp.lz"

KabutoPuzzleLZ:
INCBIN "gfx/unown_puzzle/kabuto.2bpp.lz"

OmanytePuzzleLZ:
INCBIN "gfx/unown_puzzle/omanyte.2bpp.lz"