;; Kanata configuration for MacBook Air M2 with advanced home row modifiers
;; Uses tap-hold-release-keys with bilateral combinations for better accuracy

(defcfg
  process-unmapped-keys yes
  macos-dev-names-include (
    "Apple Internal Keyboard / Trackpad"
  )
  macos-dev-names-exclude (
    "Voyager"
    "YubiKey OTP+FIDO+CCID"
  )
)

(defsrc
  ;; esc  f1   f2   f3   f4   f5   f6   f7   f8   f9   f10  f11  f12
       f1   f2                                      f10  f11  f12
  ;; grv  1    2    3    4    5    6    7    8    9    0    -    =    bspc
  ;; tab  q    w    e    r    t    y    u    i    o    p    [    ]    \
  tab  q    w    e    r    t    y    u    i    o    p
  ;; caps a    s    d    f    g    h    j    k    l    ;    '    ret
  caps a    s    d    f    g    h    j    k    l    ;
  ;; lsft z    x    c    v    b    n    m    ,    .    /    rsft
       z    x    c    v    b    n    m    ,    .    /
  ;; fn   lctl lalt lmet           spc           rmet ralt left down up   rght
                 lmet           spc           rmet
)

;; base layer with home row modifiers and proper media keys
(deflayer base
       brdn brup                                         mute vold volu
  tab  q    w    e    r    t    y    u    i    o    p
  @esc @a   @s   @d   @f   g    h    @j   @k   @l   @;
       z    x    c    @v   b    n    m    ,    .    /
                 @lmet          spc           ret
)

;; symbols layer
(deflayer symbols
       brdn brup                                         mute vold volu
  tab  S-1  S-2  S-3  S-4  S-5  S-6  S-7  S-[  S-]  S-8
  @esc `    S--  -    S-=  =    S-`  S-\  S-9  S-0  '
       z    x    c    tab  b    /    \    [    ]    S-/
                 lmet           spc           ret
)

;; numpad layer
(deflayer numbers
       brdn brup                                         mute vold volu
  tab  q    w    e    r    t    S-8  7    8    9    -
  @esc @a   @s   ,    .    g    /    4    5    6    S-=
       z    x    c    v    b    =    1    2    3    ret
                 lmet           spc           0
)

;; layer without modifiers - used temporarily when tapping home row keys
(deflayer nomods
       brdn brup                                         mute vold volu
  tab  q    w    e    r    t    y    u    i    o    p
  esc  a    s    d    f    g    h    j    k    l    ;
       z    x    c    v    b    n    m    ,    .    /
                 lmet           spc           ret
)

;; mouse and arrow key layer
(deflayer mouse
       brdn brup                                         mute vold volu
  tab  q    w    e    r    t    y    u    i    o    p
  @esc @a   @s   @d   @f   g    left down up   right ;
       z    x    c    v    b    n    m    ,    .    /
                 lmet           spc           ret
)

(deffakekeys
  to-base (layer-switch base)
)

(defvar
  ;; Timing values - adjust based on your typing speed
  tap-time 135
  hold-time 135

  ;; Define which keys are on each hand for bilateral combinations
  left-hand-keys (q w e r t a s d f g z x c v b)
  right-hand-keys (y u i o p h j k l ; n m , . /)
)

(defalias
  spotlight (multi lmet spc)  ;; Command + Space
  ;; Tap behavior: switch to nomods layer temporarily, then back to base
  tap (multi
    (layer-switch nomods)
    (on-idle-fakekey to-base tap 20)
  )

  ;; Home row modifiers with bilateral combinations
  ;; Left hand keys with LEFT-side modifiers
  a (tap-hold-release-keys $tap-time $hold-time (multi a @tap) lmet $right-hand-keys)
  s (tap-hold-release-keys $tap-time $hold-time (multi s @tap) lalt $right-hand-keys) 
  d (tap-hold-release-keys $tap-time $hold-time (multi d @tap) lctl $right-hand-keys)
  f (tap-hold-release-keys $tap-time $hold-time (multi f @tap) lsft $right-hand-keys)
  
  ;; Right hand keys with RIGHT-side modifiers
  j (tap-hold-release-keys $tap-time $hold-time (multi j @tap) rsft $left-hand-keys)
  k (tap-hold-release-keys $tap-time $hold-time (multi k @tap) rctl $left-hand-keys)
  l (tap-hold-release-keys $tap-time $hold-time (multi l @tap) ralt $left-hand-keys)
  ; (tap-hold-release-keys $tap-time $hold-time (multi ; @tap) rmet $left-hand-keys)

  v (tap-hold $tap-time $hold-time (multi v @tap) (layer-toggle numbers))
  esc (tap-hold $tap-time $hold-time (multi esc @tap) (layer-toggle mouse))
  lmet (layer-toggle symbols)
)