: blah
  ' seremit task-emit !
  ' log-emit task-echo ! ;

' seremit task-emit !

: start-repl activate blah
  s" .:: J O R T H ( jean forth) ::." type cr
  begin receive loadstring s" ok" type cr again ;
task const REPL
REPL start-repl

1 const ^ESC
28 const ^ENTER
29 const ^CTRL
51 const ^<
52 const ^>
56 const ^ALT
57 const ^SPACE
72 const ^UP
75 const ^LEFT
77 const ^RIGHT
80 const ^DOWN

: wait-key ( k -- ) begin dup key-pressed not while suspend repeat drop ;
: udelta ( u u -- u )
  2dup u> if
    swap -1 swap - + 1 +
  else
    swap -
  then ;
: sleep ( count -- )
  ticks swap begin over ticks udelta over u< while suspend repeat drop drop ;

defer tick
defer draw

: defentity ( x y dir anim -- ) array , , , , ;
: entity.x 3 cells + ;
: entity.y 2 cells + ;
: entity.dir cell + ;
: entity.anim ;

0 const W
1 const E
2 const N
3 const S

: dir>pos ( dir -- dx dy )
  dup W = if drop -1 0 ret then
  dup E = if drop 1 0 ret then
  N = if 0 -1
      else 0 1 then ;

: frame ( s n e w ) b, b, b, b, ;
array frames
( 0: car ) 3 1 0 2 frame
( 1: pete stand ) 5 7 7 5 frame
( 2: pete walk ) 6 8 8 6 frame

: sprindex ( dir frame ) 2 << frames + + b@ ;
: defstatic ( frame -- ) create b, does> b@ sprindex ;
: defanim ( frame... framecount ticks-per-frame -- )
  create b, dup b, 0 for b, next
  does> ( dir a -- )
    dup dup 1 + b@ swap b@ ( dir a count tpf )
    ticks swap / swap % ( dir a index )
    2 + + b@ sprindex ;

0 defstatic {car}
1 defstatic {pete-stand}
1 2 2 5 defanim {pete-walk}

: ~ -1 ^ ;
var player.state
: f! ( b v flag -- )
  r> dup @ ( b v val r: flag )
  <rot if r< | else r< ~ & then ( v newval )
  swap ! ;
: f@ ( v flag -- ) swap @ & ;

1 const MOVING
2 const DRIVING

: {player}
  player.state DRIVING f@ if {car}
  else player.state MOVING f@ if {pete-walk}
  else {pete-stand} then then ;

128 128 N ' {player} defentity player

( timer + lerping )
: clamp0 ( range val -- i )
  2dup  <= if drop else
  dup 0 <= if drop drop 0 else
	      swap drop then then ;
: >ratio ( range value -- f )
  over swap clamp0 swap />ratio ;
: <ratio ( range ratio -- v ) *<ratio ;
: >range ( start end -- start range ) over - ;
: <range ( start range -- start end ) over + ;
: lerpr ( start end ratio ) r> >range r< <ratio + ;
: lerpn ( start1 end1 start2 end2 val )
  r> >range r< <rot - >ratio lerpr ;
: lerp ( start end duration start -- i )
  ticks udelta ( start end duration delta )
  >ratio lerpr ;

: triggered ( duration timer -- b )
  dup r> @ ticks udelta ( duration delta )
  2dup <= if drop r< +! 1 else drop drop 0 then ;

: now! ( timer -- ) ticks swap ! ;

( F O O T E R )
var footer-y
0 footer-y !

: draw-footer footer-y @ split-screen ;

0 const BLACK
1 const BLUE
2 const GREEN
3 const CYAN
4 const RED
5 const MAGENTA
6 const BROWN
7 const LGRAY
8 const DGRAY
9 const LBLUE
10 const LGREEN
11 const LCYAN
12 const PINK
13 const LMAGENTA
14 const YELLOW
15 const WHITE

var text-color
WHITE text-color !

: texty 7 swap <rot text-color @ text ;
: text0 10 texty ;
: text1 20 texty ;
: text2 30 texty ;
: clear
  text-color @
  WHITE text-color !
  s"                                 " dup dup text0 text1 text2
  text-color ! ;

: move-to ( target speed p -- )
  dup r> @ >rot ticks ( from to duration start )
  begin
    4dup lerp r@ !
    <rot dup r@ @ != ( from duration start to !done )
  while
    >rot suspend
  repeat rdrop drop drop drop drop ;

: show-footer 48 10 footer-y move-to ;
: hide-footer 0 10 footer-y move-to ;

: footer-wait show-footer ^ENTER wait-key ;

( todo: generic say" that handles newlines, gradual text display )
: say1 ( s -- ) clear text1 footer-wait ;
: say2 ( s1 s2 -- ) clear text1 text0 footer-wait ;
: say3 ( s1 s2 s3 -- ) clear text2 text1 text0 footer-wait ;

: character ( iportrait color ) create , ,
  does> dup @ text-color ! cell + @ draw-portrait ;

0 GREEN character pete
1 MAGENTA character mary
2 BROWN character chuck

( M O U S E )

var prevbutton
: tick-debounce
  mousebuttons prevbutton ! ;

1 const MOUSEL
: mousedown ( button -- bool ) mousebuttons & ;
: clicked ( button -- bool )
  dup mousedown not swap
  prevbutton @ & and ;

( M A P )
: +pos ( x1 y1 x2 y2 -- x y )
  <rot + >rot + swap ;

var tileselect
8 const MAXTILE

: mouseworldpos mousepos scrollpos +pos ;
: world>tile 4 >> swap 4 >> swap ;
: mousetile mouseworldpos world>tile ;
: tile ( x y -- ptr ) mapsize drop * + map + ;

1 const WALKABLE
2 const DRIVABLE

array tileflags
( grass )    WALKABLE b,
( dirt )     WALKABLE b,
( water )    0 b,
( pavement ) WALKABLE DRIVABLE | b,
( brick )    0 b,
( forest )   0 b,
( roof )     0 b,
( brick )    0 b,
( window )   0 b,

: mapflag? ( x y flag -- b ) >rot tile b@ tileflags + b@ & ;
: walkable? ( x y -- b ) WALKABLE mapflag? ;
: drivable? ( x y -- b ) DRIVABLE mapflag? ;

: tick-mapedit
  tileselect @
  ^< key-pressed if 1 - then
  ^> key-pressed if 1 + then
  dup 0 < if drop MAXTILE then
  dup MAXTILE > if drop 0 then
  tileselect !

  MOUSEL mousedown if tileselect @ mousetile tile b! then ;

: copy-mapseg ( neww oldw y -- )
  r> ( oldw neww r: y )
  2dup min >rot ( copyw neww oldw )
  r@ * map + ( copyw neww src )
  swap r< * map + ( copyw src dst )
  swap <rot memmove ;

: resize-map ( neww newh -- )
  swap mapsize r> ( newh neww oldw r: oldh )
  2dup < if 1 r< else r< 1 - 0 then ( newh neww copyw ystart ylim )
  for 2dup i copy-mapseg next
  drop swap mapsize! ;

: save-map ( filename -- )
  fdeactivate swap overwrite
  mapsize swap fput fput
  mapsize * map fwrite
  factivate ;

: load-map ( filename -- )
  fdeactivate swap open
  fget fget
  2dup * map fread
  mapsize!
  factivate ;

( J O B )
var MODE-MOVE
var MODE-WAIT

: listen-for-jobs activate blah
  begin receive
    MODE-WAIT @ ' tick redefine
    execute
    hide-footer
    MODE-MOVE @ ' tick redefine
  again ;

task const JOB
JOB listen-for-jobs

( T I C K )
: player.canmove? ( x y -- )
  player.state DRIVING f@ if DRIVABLE else WALKABLE then mapflag? ;

: move-player
  player entity.dir @ dir>pos
  2dup player entity.x @ player entity.y @ world>tile +pos
  player.canmove? if
    1 player.state MOVING f!
    dup if swap drop player entity.y ( d v -- )
      else drop player entity.x then
    swap 16 * over @ + 4 <rot move-to
    0 player.state MOVING f!
  else drop drop then ;

: tick-player
  0 ^LEFT key-down if drop 1 W player entity.dir ! then
  ^RIGHT key-down if drop 1 E player entity.dir ! then
  ^UP key-down if drop 1 N player entity.dir ! then
  ^DOWN key-down if drop 1 S player entity.dir ! then
  if ' move-player JOB send then ;

: hello-world
  s" Hello, world!" say1
  s" How are you" s" today?" say2
  player.state DRIVING f@ not player.state DRIVING f! ;

: mode-move
  tick-player
  tick-mapedit
  ^SPACE key-pressed if
    ' hello-world JOB send
  then
  tick-debounce ;

' mode-move MODE-MOVE !
' tick-debounce MODE-WAIT !

: draw-entity
  r> r@ entity.x @ r@ entity.y @
  r@ entity.dir @ r< entity.anim @ execute
  draw-sprite ;

: full-draw
  player entity.x @ 152 -
  player entity.y @ 92 -
  scroll

  player draw-entity
  mouseworldpos 4 draw-sprite
  draw-screen
  draw-footer ;

MODE-MOVE @ ' tick redefine
' full-draw ' draw redefine

s" pete.map" load-map