; Mechanical Engineer (meche) island

; by deater (Vince Weaver) <vince@deater.net>

; Zero Page
	.include "zp.inc"
	.include "hardware.inc"
	.include "common_defines.inc"
	.include "common_routines.inc"

meche_start:
	;===================
	; init screen
	jsr	TEXT
	jsr	HOME
	bit	KEYRESET

	bit	SET_GR
	bit	PAGE0
	bit	LORES
	bit	FULLGR

	;=================
	; set up location
	;=================

	lda	#<locations
	sta	LOCATIONS_L
	lda	#>locations
	sta	LOCATIONS_H

	lda	#0
	sta	DRAW_PAGE
	sta	LEVEL_OVER

	; init cursor

	lda	#20
	sta	CURSOR_X
	sta	CURSOR_Y

	; set up initial location

	jsr	change_location

	lda	#1
	sta	CURSOR_VISIBLE		; visible at first

	lda	#0
	sta	ANIMATE_FRAME

	jsr	adjust_basement_door

	jsr	check_puzzle_solved

game_loop:
	;=================
	; reset things
	;=================

	lda	#0
	sta	IN_SPECIAL
	sta	IN_RIGHT
	sta	IN_LEFT

	;====================================
	; copy background to current page
	;====================================

	jsr	gr_copy_to_current

	;====================================
	; handle special-case forground logic
	;====================================

	lda	LOCATION
	cmp	#MECHE_OPEN_BOOK
	beq	animate_meche_book
	cmp	#MECHE_ELEVATOR_ROTATE
	beq	animate_elevator_rotate
	cmp	#MECHE_ROTATE_CONTROLS
	beq	animate_rotate_controls
	cmp	#MECHE_EXIT_PUZZLE
	beq	animate_meche_puzzle
	cmp	#MECHE_MIST_OPEN
	beq	animate_mist_book
	cmp	#MECHE_BLUE_SECRET_ROOM
	beq	fg_draw_blue_page
	cmp	#MECHE_RED_SECRET_ROOM
	beq	fg_draw_red_page
	cmp	#MECHE_RED_ROOM_EAST
	beq	fg_draw_crystals
	cmp	#MECHE_BLUE_ROOM_SOUTH
	beq	fg_animate_snake

	jmp	nothing_special

fg_draw_red_page:
	jsr	draw_red_page
	jmp	nothing_special

fg_draw_blue_page:
	jsr	draw_blue_page
	jmp	nothing_special

fg_draw_crystals:
	jsr	draw_crystals
	jmp	nothing_special

fg_animate_snake:
	jsr	draw_snake
	jmp	nothing_special

animate_meche_book:

	; handle animated linking book

	lda	ANIMATE_FRAME
	asl
	tay
	lda	meche_movie,Y
	sta	INL
	lda	meche_movie+1,Y
	sta	INH

	lda	#22
	sta	XPOS
	lda	#12
	sta	YPOS

	jsr	put_sprite_crop

	lda	FRAMEL
	and	#$f
	bne	done_animate_book

	inc	ANIMATE_FRAME
	lda	ANIMATE_FRAME
	cmp	#11
	bne	done_animate_book
	lda	#0
	sta	ANIMATE_FRAME
done_animate_book:
	jmp	nothing_special


animate_elevator_rotate:
	jsr	draw_elevator_panel
	jmp	nothing_special

animate_rotate_controls:
	jsr	draw_rotation_controls
	jmp	nothing_special

animate_meche_puzzle:
	jsr	draw_exit_puzzle_sprites
	jmp	nothing_special

animate_mist_book:
	lda	ANIMATE_FRAME
	cmp	#6
	bcc	mist_book_good			; blt

	lda	#0
	sta	ANIMATE_FRAME

mist_book_good:

	asl
	tay
	lda	mist_movie,Y
	sta	INL
	lda	mist_movie+1,Y
	sta	INH

	lda	#24
	sta	XPOS
	lda	#12
	sta	YPOS

	jsr	put_sprite_crop

	lda	FRAMEL
	and	#$f
	bne	done_animate_mist_book

	inc	ANIMATE_FRAME

done_animate_mist_book:
	jmp	nothing_special




nothing_special:

	;====================================
	; draw pointer
	;====================================

	jsr	draw_pointer

	;====================================
	; page flip
	;====================================

	jsr	page_flip

	;====================================
	; handle keypress/joystick
	;====================================

	jsr	handle_keypress


	;====================================
	; inc frame count
	;====================================

	inc	FRAMEL
	bne	room_frame_no_oflo
	inc	FRAMEH
room_frame_no_oflo:

	;====================================
	; check level over
	;====================================

	lda	LEVEL_OVER
	bne	really_exit
	jmp	game_loop

really_exit:
	jmp	end_level


	;=============================
draw_red_page:

	lda	DIRECTION
	cmp	#DIRECTION_N
	bne	done_draw_red_page

	lda	RED_PAGES_TAKEN
	and	#MECHE_PAGE
	bne	no_draw_page

	lda	#22
	sta	XPOS
	lda	#14
	sta	YPOS

	lda	#<red_page_sprite
	sta	INL
	lda	#>red_page_sprite
	sta	INH

	jmp	put_sprite_crop		; tail call
done_draw_red_page:
	rts

	;========================
	; draw blue page
	;========================
	; also handle jolt

draw_blue_page:
	lda	DIRECTION
	cmp	#DIRECTION_W
	beq	actually_draw_blue_page

	; else, jolting
	lda	ANIMATE_FRAME
	beq	not_done_jolt

	lda	FRAMEL
	and	#$f
	bne	not_done_jolt

	lda	#0
	sta	ANIMATE_FRAME

	ldy	#LOCATION_NORTH_BG
	lda	#<blue_secret_room_n_lzsa
	sta	location39,Y			; MECHE_BLUE_SECRET_ROOM
	lda	#>blue_secret_room_n_lzsa
	sta	location39+1,Y			; MECHE_BLUE_SECRET_ROOM

	jsr	change_direction

not_done_jolt:

	rts

actually_draw_blue_page:

	lda	BLUE_PAGES_TAKEN
	and	#MECHE_PAGE
	bne	no_draw_page

	lda	#15
	sta	XPOS
	lda	#34
	sta	YPOS

	lda	#<blue_page_sprite
	sta	INL
	lda	#>blue_page_sprite
	sta	INH

	jmp	put_sprite_crop		; tail call

no_draw_page:
	rts

	;==============================
	; Take red page
	;	or read achenar letter
	;==============================

meche_take_red_page:
	lda	DIRECTION
	cmp	#DIRECTION_N
	beq	actually_take_red_page

	; otherwise go to read letter

	lda	#MECHE_ACHENAR_LETTER
	sta	LOCATION
	jsr	change_location

	bit	SET_TEXT
	rts


actually_take_red_page:
	lda	#MECHE_PAGE
	jmp	take_red_page


	;=============================
	; Take blue page
	;	or jolt the chair
	;=============================

meche_take_blue_page:
	lda	DIRECTION
	cmp	#DIRECTION_W
	beq	actually_take_blue_page

	; if not, jolt time
	lda	#1
	sta	ANIMATE_FRAME
	lda	#0
	sta	FRAMEL

	ldy	#LOCATION_NORTH_BG
	lda	#<blue_secret_room_jolt_n_lzsa
	sta	location39,Y			; MECHE_BLUE_SECRET_ROOM
	lda	#>blue_secret_room_jolt_n_lzsa
	sta	location39+1,Y			; MECHE_BLUE_SECRET_ROOM

	jmp	change_direction


actually_take_blue_page:

	lda	#MECHE_PAGE
	jmp	take_blue_page

	;==========================
	; includes
	;==========================

	; puzzles

	.include	"meche_rotation.s"

	; graphics

	.include	"graphics_meche/meche_graphics.inc"

	; sound
	.include	"simple_sounds.s"

	; linking books

	.include	"link_book_meche.s"
	.include	"link_book_mist.s"
	.include	"handle_pages.s"

	; level data

	.include	"leveldata_meche.inc"