1 files changed, 418 insertions, 0 deletions
diff --git a/src/engine/menus/start.asm b/src/engine/menus/start.asm
new file mode 100644
index 0000000..4d46d4a
--- /dev/null
+++ b/src/engine/menus/start.asm
@@ -0,0 +1,418 @@
+; plays the Opening sequence, and handles player selection
+; in the Title Screen and Start Menu
+HandleTitleScreen:
+; if last selected item in Start Menu is 0 (Card Pop!)
+; then skip straight to the Start Menu
+; this makes it so that returning from Card Pop!
+; doesn't play the Opening sequence
+	ld a, [wLastSelectedStartMenuItem]
+	or a
+	jr z, .start_menu
+
+.play_opening
+	ld a, MUSIC_STOP
+	call PlaySong
+	call Func_3ca0
+	call PlayIntroSequence
+	call LoadTitleScreenSprites
+
+	xor a
+	ld [wd635], a
+	ld a, $3c
+	ld [wTitleScreenIgnoreInputCounter], a
+.loop
+	call DoFrameIfLCDEnabled
+	call UpdateRNGSources
+	call AnimateRandomTitleScreenOrb
+	ld hl, wd635
+	inc [hl]
+	call AssertSongFinished
+	or a
+	jr nz, .song_playing
+	; reset back to the opening sequence
+	farcall Func_10ab4
+	jr .play_opening
+
+.song_playing
+	; should we ignore user input?
+	ld hl, wTitleScreenIgnoreInputCounter
+	ld a, [hl]
+	or a
+	jr z, .check_keys
+	; ignore input, decrement the counter
+	dec [hl]
+	jr .loop
+
+.check_keys
+	ldh a, [hKeysPressed]
+	and A_BUTTON | START
+	jr z, .loop
+	ld a, SFX_02
+	call PlaySFX
+	farcall Func_10ab4
+
+.start_menu
+	call CheckIfHasSaveData
+	call HandleStartMenu
+
+; new game
+	ld a, [wStartMenuChoice]
+	cp START_MENU_NEW_GAME
+	jr nz, .continue_from_diary
+	call DeleteSaveDataForNewGame
+	jr c, HandleTitleScreen
+	jr .card_pop
+.continue_from_diary
+	ld a, [wStartMenuChoice]
+	cp START_MENU_CONTINUE_FROM_DIARY
+	jr nz, .card_pop
+	call AskToContinueFromDiaryWithDuelData
+	jr c, HandleTitleScreen
+.card_pop
+	ld a, [wStartMenuChoice]
+	cp START_MENU_CARD_POP
+	jr nz, .continue_duel
+	call ShowCardPopCGBDisclaimer
+	jr c, HandleTitleScreen
+.continue_duel
+	call ResetDoFrameFunction
+	call Func_3ca0
+	ret
+
+; updates wHasSaveData and wHasDuelSaveData
+; depending on whether the save data is valid or not
+CheckIfHasSaveData:
+	farcall ValidateBackupGeneralSaveData
+	ld a, TRUE
+	jr c, .no_error
+	ld a, FALSE
+.no_error
+	ld [wHasSaveData], a
+	cp $00 ; or a
+	jr z, .write_has_duel_data
+	bank1call ValidateSavedNonLinkDuelData
+	ld a, TRUE
+	jr nc, .write_has_duel_data
+	ld a, FALSE
+.write_has_duel_data
+	ld [wHasDuelSaveData], a
+	farcall ValidateBackupGeneralSaveData
+	ret
+
+; handles printing the Start Menu
+; and getting player input and choice
+HandleStartMenu:
+	ld a, MUSIC_PC_MAIN_MENU
+	call PlaySong
+	call DisableLCD
+	farcall Func_10000
+	lb de, $30, $8f
+	call SetupText
+	call Func_3ca0
+	xor a
+	ld [wLineSeparation], a
+	call .DrawPlayerPortrait
+	call .SetStartMenuParams
+
+	ld a, $ff
+	ld [wTitleScreenIgnoreInputCounter], a
+	ld a, [wLastSelectedStartMenuItem]
+	cp $4
+	jr c, .init_menu
+	ld a, [wHasSaveData]
+	or a
+	jr z, .init_menu
+	ld a, 1 ; start at second menu option
+.init_menu
+	ld hl, wStartMenuParams
+	farcall InitAndPrintPauseMenu
+	farcall FlashWhiteScreen
+
+.wait_input
+	call DoFrameIfLCDEnabled
+	call UpdateRNGSources
+	call HandleMenuInput
+	push af
+	call PrintStartMenuDescriptionText
+	pop af
+	jr nc, .wait_input
+	ldh a, [hCurMenuItem]
+	cp e
+	jr nz, .wait_input
+
+	ld [wLastSelectedStartMenuItem], a
+	ld a, [wHasSaveData]
+	or a
+	jr nz, .no_adjustment
+	; New Game is 3rd option
+	; but when there's no save data,
+	; it's the 1st in menu list, so adjust it
+	inc e
+	inc e
+.no_adjustment
+	ld a, e
+	ld [wStartMenuChoice], a
+	ret
+
+.SetStartMenuParams
+	ld hl, .StartMenuParams
+	ld de, wStartMenuParams
+	ld bc, .StartMenuParamsEnd - .StartMenuParams
+	call CopyDataHLtoDE
+
+	ld e, 0
+	ld a, [wHasSaveData]
+	or a
+	jr z, .get_text_id ; New Game
+	inc e
+	ld a, 2
+	call .AddItems
+	ld a, [wHasDuelSaveData]
+	or a
+	jr z, .get_text_id ; Continue From Diary
+	inc e
+	ld a, 1
+	call .AddItems
+	; Continue Duel
+
+.get_text_id
+	sla e
+	ld d, $00
+	ld hl, .StartMenuTextIDs
+	add hl, de
+	; set text ID as Start Menu param
+	ld a, [hli]
+	ld [wStartMenuParams + 6], a
+	ld a, [hl]
+	ld [wStartMenuParams + 7], a
+	ret
+
+; adds c items to start menu list
+; this means adding 2 units per item to the text box height
+; and adding to the number of items
+.AddItems
+	push bc
+	ld c, a
+	; number of items in menu
+	ld a, [wStartMenuParams + 12]
+	add c
+	ld [wStartMenuParams + 12], a
+	; height of text box
+	sla c
+	ld a, [wStartMenuParams + 3]
+	add c
+	ld [wStartMenuParams + 3], a
+	pop bc
+	ret
+
+.StartMenuParams
+	db  0, 0 ; start menu coords
+	db 14, 4 ; start menu text box dimensions
+
+	db  2, 2 ; text alignment for InitTextPrinting
+	tx NewGameText
+	db $ff
+
+	db 1, 2 ; cursor x, cursor y
+	db 2 ; y displacement between items
+	db 1 ; number of items
+	db SYM_CURSOR_R ; cursor tile number
+	db SYM_SPACE ; tile behind cursor
+	dw NULL ; function pointer if non-0
+.StartMenuParamsEnd
+
+.StartMenuTextIDs
+	tx NewGameText
+	tx CardPopContinueDiaryNewGameText
+	tx CardPopContinueDiaryNewGameContinueDuelText
+
+.DrawPlayerPortrait
+	lb bc, 14, 1
+	farcall $4, DrawPlayerPortrait
+	ret
+
+; prints the description for the current selected item
+; in the Start Menu in the text box
+PrintStartMenuDescriptionText:
+	push hl
+	push bc
+	push de
+	; don't print if it's already showing
+	ld a, [wCurMenuItem]
+	ld e, a
+	ld a, [wCurHighlightedStartMenuItem]
+	cp e
+	jr z, .skip
+	ld a, [wHasSaveData]
+	or a
+	jr nz, .has_data
+	; New Game option is 3rd element
+	; in function table, so add 2
+	inc e
+	inc e
+.has_data
+
+	ld a, e
+	push af
+	lb de, 0, 10
+	lb bc, 20, 8
+	call DrawRegularTextBox
+	pop af
+	ld hl, .StartMenuDescriptionFunctionTable
+	call JumpToFunctionInTable
+.skip
+	ld a, [wCurMenuItem]
+	ld [wCurHighlightedStartMenuItem], a
+	pop de
+	pop bc
+	pop hl
+	ret
+
+.StartMenuDescriptionFunctionTable
+	dw .CardPop
+	dw .ContinueFromDiary
+	dw .NewGame
+	dw .ContinueDuel
+
+.CardPop
+	lb de, 1, 12
+	call InitTextPrinting
+	ldtx hl, WhenYouCardPopWithFriendText
+	call PrintTextNoDelay
+	ret
+
+.ContinueDuel
+	lb de, 1, 12
+	call InitTextPrinting
+	ldtx hl, TheGameWillContinueFromThePointInTheDuelText
+	call PrintTextNoDelay
+	ret
+
+.NewGame
+	lb de, 1, 12
+	call InitTextPrinting
+	ldtx hl, StartANewGameText
+	call PrintTextNoDelay
+	ret
+
+.ContinueFromDiary
+	; get OW map name
+	ld a, [wCurOverworldMap]
+	add a
+	ld c, a
+	ld b, $00
+	ld hl, OverworldMapNames
+	add hl, bc
+	ld a, [hli]
+	ld [wTxRam2 + 0], a
+	ld a, [hl]
+	ld [wTxRam2 + 1], a
+
+	; get medal count
+	ld a, [wMedalCount]
+	ld [wTxRam3 + 0], a
+	xor a
+	ld [wTxRam3 + 1], a
+
+	; print text
+	lb de, 1, 10
+	call InitTextPrinting
+	ldtx hl, ContinueFromDiarySummaryText
+	call PrintTextNoDelay
+
+	ld a, [wTotalNumCardsCollected]
+	ld d, a
+	ld a, [wTotalNumCardsToCollect]
+	ld e, a
+	ld bc, $90e
+	farcall Func_1024f
+	ld bc, $a10
+	farcall Func_101df
+	ret
+
+; asks the player whether it's okay to delete
+; the save data in order to create a new one
+; if player answers "yes", delete it
+DeleteSaveDataForNewGame:
+; exit if there no save data
+	ld a, [wHasSaveData]
+	or a
+	ret z
+
+	call DisableLCD
+	farcall Func_10000
+	call Func_3ca0
+	farcall FlashWhiteScreen
+	call DoFrameIfLCDEnabled
+	ldtx hl, SavedDataAlreadyExistsText
+	call PrintScrollableText_NoTextBoxLabel
+	ldtx hl, OKToDeleteTheDataText
+	call YesOrNoMenuWithText
+	ret c ; quit if chose "no"
+	farcall InvalidateSaveData
+	ldtx hl, AllDataWasDeletedText
+	call PrintScrollableText_NoTextBoxLabel
+	or a
+	ret
+
+; asks the player if the game should resume
+; from diary even though there is Duel save data
+; returns carry if "no" was selected
+AskToContinueFromDiaryWithDuelData:
+; return if there's no duel save data
+	ld a, [wHasDuelSaveData]
+	or a
+	ret z
+
+	call DisableLCD
+	farcall Func_10000
+	call Func_3ca0
+	farcall FlashWhiteScreen
+	call DoFrameIfLCDEnabled
+	ldtx hl, DataExistsWhenPowerWasTurnedOFFDuringDuelText
+	call PrintScrollableText_NoTextBoxLabel
+	ldtx hl, ContinueFromDiaryText
+	call YesOrNoMenuWithText
+	ret c
+	or a
+	ret
+
+; shows disclaimer for Card Pop!
+; in case player is not playing in CGB
+; return carry if disclaimer was shown
+ShowCardPopCGBDisclaimer:
+; return if playing in CGB
+	ld a, [wConsole]
+	cp CONSOLE_CGB
+	ret z
+
+	lb de, 0, 10
+	lb bc, 20, 8
+	call DrawRegularTextBox
+	lb de, 1,12
+	call InitTextPrinting
+	ldtx hl, YouCanAccessCardPopOnlyWithGameBoyColorsText
+	call PrintTextNoDelay
+	lb bc, SYM_CURSOR_D, SYM_BOX_BOTTOM
+	lb de, 18, 17
+	call SetCursorParametersForTextBox
+	call WaitForButtonAorB
+	scf
+	ret
+
+DrawPlayerPortraitAndPrintNewGameText:
+	call DisableLCD
+	farcall Func_10a9b
+	farcall Func_10000
+	call Func_3ca0
+	ld hl, HandleAllSpriteAnimations
+	call SetDoFrameFunction
+	lb bc, 7, 3
+	farcall $4, DrawPlayerPortrait
+	farcall Func_10af9
+	call DoFrameIfLCDEnabled
+	ldtx hl, IsCrazyAboutPokemonAndPokemonCardCollectingText
+	call PrintScrollableText_NoTextBoxLabel
+	call ResetDoFrameFunction
+	call Func_3ca0
+	ret