' putc task-emit !
:noname s" debug.jor" loadfile ; execute
' seremit dbg-emit !

-1 const LOGFILE
: emit-log fdeactivate LOGFILE factivate fputc fdeactivate drop factivate ;
: quit LOGFILE factivate close _quit ;

: DBG :| ' seremit task-emit ! execute cr |; 0 task-emit preserving ;
: DTYPE ' type DBG ;

: dorepl begin receive loadstring s" ok" type cr again ;
: start-repl activate
  ' putc task-emit ! ' emit-log task-echo !
  s" .:: J O P L ( jean OPL2 print loop) ::." type cr
  dorepl ;
task const REPL

: start-dbg activate ' seremit task-emit !
  s" .:: J D B G ( jean debugger) ::." type cr
  dorepl ;
task const DBG
DBG start-dbg

var voice
var op

: +voice! voice @ + 10 % voice ! ;

: op-with-voice voice @
  dup 5 > if 5 + then
  dup 2 > if 5 + then
  + op @ + ;
: opreg create b, does> ub@ op-with-voice ;
: voicereg create b, does> ub@ voice @ + ;

0x20 opreg ar-flags
0x40 opreg ar-level
0x60 opreg ar-ad
0x80 opreg ar-sr
0xe0 opreg ar-wave
0xc0 voicereg ar-alg

0xa0 voicereg ar-freq
0xb0 voicereg ar-note

: op2 3 op ! ;
: op1 0 op ! ;
: loadop ( flags level ad sr wave -- )
  ar-wave adlib!
  ar-sr adlib!
  ar-ad adlib!
  ar-level adlib!
  ar-flags adlib! ;

: readop ( v -- )
  >r r@ 4 + b@ r@ 3 + b@ r@ 2 + b@ r@ 1 + b@ <r b@ loadop ;

: instrument ( alg f1 l1 ad1 sr1 w1 f2 l2 ad2 sr2 w2 -- )
  array b, b, b, b, b, b, b, b, b, b, b, ;
: blank-instrument array 11 allot ;
: copy-instrument ( s d -- )
  0 11 for over i + b@ over i + b! next drop drop ;
: loadinst ( p -- ) dup dup 5 + op1 readop op2 readop
  10 + b@ ar-alg adlib! ;

0 0x01 0x10 0xf0 0x77 0 0x01 0x00 0xf0 0x77 0 instrument default
blank-instrument current
: current! current copy-instrument ;

: swap-op ( inst -- )
  0 5 for dup ub@ over 5 + ub@ >r over 5 + b! <r over b! 1 + next ;
 
: freqon ( oct freq -- )
  dup 0xff & ar-freq adlib!
  8 >> 0x03 & swap 2 << | 0x20 | ar-note adlib! ;
: noteoff ( -- ) 0 ar-note adlib! ; userword

array semitones
3520 3520 />ratio ,
3729 3520 />ratio ,
3951 3520 />ratio ,
4186 3520 />ratio ,
4435 3520 />ratio ,
4699 3520 />ratio ,
4978 3520 />ratio ,
5274 3520 />ratio ,
5588 3520 />ratio ,
5920 3520 />ratio ,
6272 3520 />ratio ,
6645 3520 />ratio ,

: note dup 12 / 8 % swap 12 % cells semitones + @ 440 swap *<ratio ;
: noteon noteoff note freqon ;


: read-sbi-reg ( reg-cp -- )
  fgetc swap execute adlib! ;

: read-sbi-op-reg ( offset -- )
  dup 5 + current + fgetc swap b!
  current + fgetc swap b! ;

: loadsbi ( filename -- )
  open 36 seek
  4 -1 for i read-sbi-op-reg next
  fgetc current 10 + b!
  close
  current loadinst ; userword

: write-sbi-op-reg ( offset -- )
  dup current + 5 + b@ fputc current + b@ fputc ;

: writezeros ( n -- ) 0 for 0 fputc next ;
: savesbi ( filename -- )
  overwrite
  [ key S lit ] fputc [ key B lit ] fputc [ key I lit ] fputc 0x1a fputc
  32 writezeros
  4 -1 for i write-sbi-op-reg next
  10 current + b@ fputc
  5 writezeros
  close ; userword


: rndbyte 256 rnd dup . ;
: rndop rndbyte rndbyte rndbyte rndbyte rndbyte s" loadop " type loadop ;
: rndinst s" op1 " type op1 rndop s" op2 " type op2 rndop
	  rndbyte s" ar-alg adlib! " type cr ar-alg adlib! ; userword

: panic 9 -1 for i voice ! noteoff next ; userword

var songticks

var beatcount
4 beatcount !

var notestate
var octave
: oct+ octave @ 12 * + ; userword
: rest songticks @ begin suspend dup songticks @ != until drop ; userword
: beat begin dup songticks @ beatcount @ % 0 != while rest repeat drop ; userword
: %O octave ! ; userword
: %V voice ! ; userword
: %loop 0xfe b, ; userword
: mod % ;
: % notestate @ if 0xf0 b, else rest then ; userword
: %% 0 for % next ; userword
: %- notestate @ if 0xfd b, else noteoff then ; userword

: mknote create b, does> ub@ oct+ notestate @ if b, else noteon rest then ;

11 mknote G# userword
10 mknote G  userword
9  mknote F# userword
8  mknote F  userword
7  mknote E  userword
6  mknote D# userword
5  mknote D  userword
4  mknote C# userword
3  mknote C  userword
2  mknote B  userword
1  mknote A# userword
0  mknote A  userword

array tracks 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 ,
array tracks-start 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 ,

: track ( i -- p ) cells tracks + ;
: vtrack ( -- p ) voice @ track ;

: curr-track-start voice @ cells tracks-start + ;
: track-tick ( -- )
  vtrack @ >r r@ if ( r: track )
    songticks @ curr-track-start @ - ( -- index )

    ( call instrument word if start of track )
    dup not if r@ cell + @ execute then ( index -- index )

    ( call "tick" word )
    dup r@ @ execute ( index -- index )

    2 cells + r@ + ub@ ( index -- note )
    dup 0xf0 < if noteon
    else dup 0xfd = if noteoff
    else 0xfe = if songticks @ curr-track-start ! track-tick ( loop )
    then then then
  then rdrop ;

: pad-track ( start end -- )
  swap - beatcount @ mod ( s e -- cpad )
  dup if 0 for % next else drop then ;

: :track create ' drop , ' noop , here 1 notestate ! does>
  beat vtrack ! songticks @ curr-track-start ! ; userword

: ;track here pad-track %loop 0 notestate ! ; userword
: shush 0 voice @ track ! %- ; userword

: prev-name ( wordname -- wordname )
  2 cells - @ 2 cells + ;
: 'name [ ' [ , ' ' , ' ] , ] ` lit ; immediate

: emit-octave ( note -- )
  12 / dup octave @ != if dup octave ! . s" %O " type else drop then ;

: emit-note ( note -- )
  'name A swap 12 mod 0 for prev-name next type bl ;

: emit-cmd ( cmd -- more )
  dup 0xf0 = if s" % " type then
  dup 0xfd = if s" %- " type then
  dup 0xf0 < if dup emit-octave emit-note 1 then
  dup 0xfe = if 'name ;track type cr drop 0 then ;

: emit-track ( 'track -- )
  -1 octave ! dup ` swap 2 cells +
  'name :track type bl swap type bl
  begin dup ub@ emit-cmd while 1 + repeat drop ; userword

: emit-inst ( pinst -- )
  11 -1 for dup i + ub@ . next drop s" instrument XXX" type cr ;

( T E X T )

: setattr-to ( w -- ) 0 for attremit next ;

: clearline begin 0 emit-direct textx @ textleft @ = until ;

: rpad ( n -- )
  textleft @ + textx @ for bl next ;

: read-direct ( x y -- s )
  80 * + here swap
  begin dup 1 << 0xb800 b@far dup sp != while b, 1 + repeat
  0 b, drop drop dup here! ;

: status
  0 textx ! 0 texty ! 0 textleft !
  s"  V: " type voice @ .
  s"  O: " type octave @ .
  s"  T: " type songticks @ .
  clearline ;

: emit-status-cmd ( ip -- ip )
  dup ub@ swap 1 + swap
  dup 0xf0 = if s" % " type then
  dup 0xfd = if s" - " type then
  dup 0xf0 < if dup emit-note then
  dup 0xfe = if
    16 textattr +!
    swap @ emit-status-cmd swap
    -16 textattr +!
  then drop ;

: showtrack ( n -- )
  dup . s" : " type
  track @ dup if 20 0 for emit-status-cmd next then drop
  clearline ;

: trackstatus voice @ showtrack ;

var tempo userword 1 tempo !
: player
  1 songticks +!
  songticks @ tempo @ mod 0 = if
    voice @
    0 10 for i voice ! track-tick next
    voice !
  then ;

var t2
: startt2
  0x60 0x04 adlib!
  0x80 0x04 adlib!
  t2 @ 0x03 adlib!
  0x42 0x04 adlib! ;

: ontick startt2 player
  :| status ( trackstatus ) |; 0 textleft textx texty preserving ;

41 const ^~
52 const ^.
51 const ^,
78 const ^#+
74 const ^#-
75 const ^LEFT
77 const ^RIGHT
72 const ^UP
80 const ^DOWN
73 const ^PGUP
81 const ^PGDN
28 const ^ENTER
26 const ^[
27 const ^]

: keynote [ inline|
44 b, 31 b, 45 b, 32 b, 46 b, 47 b, 34 b, 48 b, 35 b, 49 b, 36 b, 50 b,
16 b, 3  b, 17 b, 4  b, 18 b, 19 b, 6  b, 20 b, 7  b, 21 b, 8  b, 22 b,
23 b, 10 b, 24 b, 11 b, 25 b,
|inline ] 0 29 for dup i + ub@ key-pressed if drop i 3 + rdrop rdrop ret then next
  drop ^, key-pressed if 15 else 0 then ; userword

: onkeynote ( cp -- ) keynote dup if oct+ swap execute else drop drop then ;

var stopkeys
: stoponesc 1 key-pressed if 1 stopkeys ! then ;

: voicekeys
  ^#+ key-pressed if 1 octave +! then
  ^#- key-pressed if -1 octave +! then ;
  ^[ key-pressed if -1 +voice! then
  ^] key-pressed if 1 +voice! then ;

: dokeys ( cp -- )
  >r 0 stopkeys ! key-start begin
    key-debounce r@ execute suspend
  stopkeys @ until key-end rdrop ;

: nextnote ( ip -- ip )
  dup if
    dup ub@ >r
    r@ 0xff = if drop 0 else
    r@ 0xfe = if 1 + @ nextnote then then
    rdrop
  then ;

: setnote ( note -- )
  voice @ track @ nextnote
  dup if b! else drop drop then ;

: record
  0x4f textattr !
  :| stoponesc voicekeys
     ' setnote onkeynote
     ^~ key-pressed if 0xfd setnote then
     ^. key-down if 0xf0 setnote then
  |; dokeys
  0x1f textattr ! ; userword

: jamkeys
  stoponesc voicekeys
  ' noteon onkeynote
  ^~ key-pressed if noteoff then ;

: jam ( todo: print? ) ' jamkeys dokeys ; userword

var menuscroll
var menuy
var menuw

defer onselect

: menu-at ( cp x y w -- )
  :| menuw ! texty ! dup textx ! textleft !
     ' emit-direct task-emit ! 0 task-echo !
     0 menuscroll ! 0 menuy !
     execute ' noop ' onselect redefine |;
  0 textleft task-emit task-echo preserving ;

: menu-lines ( -- count ) 24 texty @ - ;
: menu-skip menuscroll @ 0 max ;
: menu-selectedy menuy @ menu-skip - texty @ + ;

: menuitem-bg ( attr -- )
  :| menu-selectedy texty !
     textleft @ textx !
     textattr ! menuw @ setattr-to |;
  0 texty textx textattr preserving ;

: deselect-menu ( -- ) 0x1f menuitem-bg ;
: select-menu ( -- ) 0x30 menuitem-bg ;

: selected-text textx @ menu-selectedy read-direct ;

: draw-menu ( cp -- ) 0 texty textattr preserving select-menu ;

: change-selection ( dy -- )
  deselect-menu menuy +!pos select-menu onselect ;

: page-selection ( redraw dy -- 1 )
  dup menuscroll +!pos menuy +!pos drop 1 ;

: key-menu ( -- redraw )
  :|
    0 ( redraw )
    ^UP key-pressed if -1 change-selection then
    ^DOWN key-pressed if 1 change-selection then
    ^PGUP key-pressed if -10 page-selection then
    ^PGDN key-pressed if 10 page-selection then
  |; draw-menu ;

: draw-filemenu ( glob -- )
  :| findfile
     menu-skip 0 for drop nextfile next
     menu-lines 0 for dup if type else drop then 13 rpad cr nextfile next
     drop |; draw-menu ;

: inst ( -- )
  :| selected-text loadsbi |; ' onselect redefine
  :| s" *.sbi" draw-filemenu
     :| jamkeys
	key-menu if s" *.sbi" draw-filemenu then
	^ENTER key-pressed if 1 stopkeys ! then
     |; dokeys
  |; 66 1 13 menu-at ; userword

: shift-from-mask ( mask -- shift )
  0 swap begin dup 1 & not while 1 >> swap 1 + swap repeat drop ;

: bf! ( v addr mask -- )
  >r dup ub@ r@ ~ & <rot ( addr dstv srcv r:mask )
  r@ shift-from-mask << <r & | swap b! ;

: bf@ ( addr mask -- v ) >r ub@ r@ & <r shift-from-mask >> ;

: poly! ( v [...] get set -- ) swap drop execute ;
: poly@ ( [...] get set -- v ) drop execute ;
: poly-bf ' bf@ ' bf! ;
: poly-noop ' 0 ' drop ;

: bitfield ( byteoffset mask -- )
  create b, b, does> ( addr bf -- addr mask )
  >r r@ 1 + ub@ + <r ub@ ;

: wordchain create 0 , 0 , does> ( l ) dup cell + swap @ if
    @ ( link creation mode done; fetch the head )
  else ( make new link )
    here over @ , swap ! latest ,
  then ;
: endwordchain ( cp -- ) 2 cells + 1 swap ! ;
: linkedval ( link -- val ) cell + @ ;
: nth-linkedval ( link c -- val )
  begin dup while 1 - swap @ swap repeat drop linkedval ;

wordchain opbits
4 0x80 bitfield @ampmod opbits
4 0x40 bitfield @vib opbits
4 0x20 bitfield @egtype opbits
4 0x10 bitfield @ksr opbits
4 0x0f bitfield @mod-freq-mult opbits
3 0xc0 bitfield @scaling-level opbits
3 0x3f bitfield @output-level opbits
2 0xf0 bitfield @attack opbits
2 0x0f bitfield @decay opbits
1 0xf0 bitfield @sustain opbits
1 0x0f bitfield @release opbits
0 0x03 bitfield @wave opbits
' opbits endwordchain

: c+op current op @ not if 5 + then ;

: count-links 0 swap links each swap 1 + swap more ;
opbits count-links const #opbits

wordchain algbits
10 0x0e bitfield @feedback algbits
10 0x01 bitfield @decay-alg algbits
' algbits endwordchain
algbits count-links const #algbits

: lookup-nth-bitfield ( n inst link -- p mask )
  <rot nth-linkedval codepointer execute ;

: instfield ( n -- [...] get set )
  dup 1 < if
    drop :| op @ 1 & |; :| if op2 else op1 then |;
  else 1 - dup #opbits < if
    c+op opbits lookup-nth-bitfield poly-bf
  else #opbits - dup #algbits < if
    current algbits lookup-nth-bitfield poly-bf
  else drop poly-noop then then then ;

: draw-wordchain ( i link -- i )
  links each
    dup linkedval wordname type 25 rpad
    over instfield poly@ . 30 rpad cr
    swap 1 + swap
  more ;

: draw-inst
  :| s" operator" type 25 rpad 0 instfield poly@ . 30 rpad cr
     1 opbits draw-wordchain
       algbits draw-wordchain drop |; draw-menu ;

: redraw-instfield ( n -- )
  dup if
    :| 25 textx ! dup texty +! instfield poly@ . 30 rpad |;
    0 textx texty preserving
  else
    draw-inst ( 0 is operator - need to redraw all values )
  then ;

: modify-instfield ( n cp -- )
  over instfield poly@ swap execute over instfield poly!
  redraw-instfield
  op @ current loadinst op ! ;

: edinst
  :| draw-inst
     :| jamkeys
	key-menu if draw-inst then
	^LEFT key-pressed if menuy @ :| 1 - |; modify-instfield then
	^RIGHT key-pressed if menuy @ :| 1 + |; modify-instfield then
	^ENTER key-pressed if 1 stopkeys ! then
     |; dokeys
  |; 0 1 30 menu-at ; userword

: dune ( -- ) s" dune" chdir inst s" .." chdir ;


:noname
  s" jopl.log" open seekend fdeactivate ' LOGFILE redefine
  REPL start-repl

  9 -1 for i voice ! default loadinst next
  startt2
  ' emit-direct task-emit !
; ' onload redefine

2 %O
:track bassline C % % C % % % G % % % G % % G % % C % % C % % % G 8 %% ;track