;==============================
	; Handle Keypress
	;==============================
handle_keypress:

	; first handle joystick
	lda	JOYSTICK_ENABLED
	beq	actually_handle_keypress

	; only check joystick every-other frame
	lda	FRAMEL
	and	#$1
	beq	actually_handle_keypress

check_button:
        lda     PADDLE_BUTTON0
        bpl     button_clear

        lda     JS_BUTTON_STATE
        bne     js_check

        lda     #1
        sta     JS_BUTTON_STATE
        lda     #' '
        jmp     check_sound

button_clear:
        lda     #0
        sta     JS_BUTTON_STATE

js_check:
        jsr     handle_joystick

js_check_left:
        lda     value0
        cmp     #$20
        bcs     js_check_right  ; if less than 32, left
        lda     #'A'
        bne     check_sound

js_check_right:
        cmp     #$40
        bcc     js_check_up
        lda     #'D'
        bne     check_sound

js_check_up:
        lda     value1
        cmp     #$20
        bcs     js_check_down
        lda     #'W'

        bne     check_sound

js_check_down:
        cmp     #$40
        bcc     done_joystick
        lda     #'S'
        bne     check_sound


done_joystick:



actually_handle_keypress:
	lda	KEYPRESS
	bmi	keypress

	jmp	no_keypress

keypress:
	and	#$7f			; clear high bit
	cmp	#' '
	beq	check_sound		; make sure not to lose space
	and	#$df			; convert uppercase to lower case

check_sound:
	cmp	#$14			; control-T
	bne	check_help

	lda	SOUND_STATUS
	eor	#SOUND_DISABLED
	sta	SOUND_STATUS
	jmp	done_keypress

check_help:
	cmp	#'H'			; H (^H is same as left)
	bne	check_joystick

	jsr	print_help
	jmp	done_keypress

	; can't be ^J as that's the same as down
check_joystick:
	cmp	#'J'			; J
	bne	check_left

	lda	JOYSTICK_ENABLED
	eor	#1
	sta	JOYSTICK_ENABLED
	jmp	done_keypress

check_left:
	cmp	#'A'
	beq	left_pressed
	cmp	#8			; left key
	bne	check_right

left_pressed:

	lda	TILEMAP_X
	beq	keen_walk_left

	sec
	lda	MARS_TILEX
	sbc	TILEMAP_X
	cmp	#7
	bcs	keen_walk_left

keen_scroll_left:
	dec	TILEMAP_X
	dec	MARS_TILEX

	jsr	copy_tilemap_subset
	jmp	done_move_keen

keen_walk_left:
	dec	MARS_X
	bpl	dwl_noflo
	lda	#1
	sta	MARS_X
	dec	MARS_TILEX
dwl_noflo:

;	ldy	MARS_X
;	dey
;	ldx	MARS_Y
;	jsr	check_valid_feet
;	bcc	done_left_pressed
;	dec	MARS_X
done_left_pressed:
	jmp	done_keypress

check_right:
	cmp	#'D'
	beq	right_pressed
	cmp	#$15			; right key
	bne	check_up

right_pressed:


move_right:
	lda	TILEMAP_X
	cmp	#50			; 70-20
	bcs	keen_walk_right

	sec
	lda	MARS_TILEX
	sbc	TILEMAP_X
	cmp	#11
	bcc	keen_walk_right

keen_scroll_right:

	inc	TILEMAP_X
	inc	MARS_TILEX

	jsr	copy_tilemap_subset

	jmp	done_move_keen

keen_walk_right:
	inc	MARS_X
	lda	MARS_X
	cmp	#2
	bne	dwr_noflo

	lda	#0
	sta	MARS_X

	inc	MARS_TILEX

dwr_noflo:

;	ldy	MARS_X
;	iny
;	ldx	MARS_Y
;	jsr	check_valid_feet
;	bcc	done_right_pressed
;	inc	MARS_X
done_right_pressed:
	jmp	done_keypress

check_up:
	cmp	#'W'
	beq	up_pressed
	cmp	#$0B			; up key
	bne	check_down

up_pressed:
	ldy	MARS_X
	ldx	MARS_Y
	dex
	jsr	check_valid_feet
	bcc	done_up_pressed
	dec	MARS_Y
done_up_pressed:
	jmp	done_keypress

check_down:
	cmp	#'S'
	beq	down_pressed
	cmp	#$0A
	bne	check_space
down_pressed:
	ldy	MARS_X
	ldx	MARS_Y
	inx
	jsr	check_valid_feet
	bcc	done_up_pressed
	inc	MARS_Y
done_down_pressed:
	jmp	done_keypress

check_space:
	cmp	#' '
	bne	check_return
space_pressed:

	jsr	do_action

	jmp	done_keypress

check_return:
	cmp	#13
	bne	check_escape

return_pressed:
	;inc	LEVEL_OVER

	jsr	do_action

done_return:
	jmp	no_keypress

check_escape:
	cmp	#27
	bne	done_keypress

	jsr	print_quit

	jmp	done_keypress


done_move_keen:
done_keypress:
no_keypress:
	bit	KEYRESET
	rts