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--[[
  rebind: min_sdk=3.11.0
  rebind: name=Keyboard and Mouse to Joypad
  rebind: description=WASD drives the left stick, the mouse the right stick, and the mouse buttons pull the triggers.
  rebind: hardware_only=true
  rebind: mouse_block=true
  rebind: permissions=none
]]

-- needs hardware mode and a Rebind Link whose USB profile includes a joypad;
-- add Joypad under Devices > Flash identity before attaching a controller

local cfg = rb.ui.schema({
  toggle = rb.ui.keybind("F9", { label = "Engage / release" }),
  gain = rb.ui.slider(0.35, { min = 0.05, max = 1, step = 0.05, label = "Mouse gain" }),
  smoothing = rb.ui.slider(55, { min = 0, max = 90, suffix = "%", label = "Stick smoothing" }),
})

local MOVE_KEYS = {
  W = { x = 0, y = -1 },
  S = { x = 0, y = 1 },
  A = { x = -1, y = 0 },
  D = { x = 1, y = 0 },
}

local IDLE_MS = 250 -- hand the axes back to a real controller after this

local engaged = false
local held = {}
local trigger = { LT = 0, RT = 0 }
local acc_x, acc_y = 0, 0
local rsx, rsy = 0, 0
local idle_ms, driving = 0, false

local function clamp(v, lo, hi)
  return math.max(lo, math.min(hi, v))
end

local function release_all()
  if driving then
    rb.hid.joypad_reset() -- axes a script sets stay set until this
    driving = false
  end
  acc_x, acc_y = 0, 0
  rsx, rsy = 0, 0
  trigger.LT, trigger.RT = 0, 0
  held = {}
  idle_ms = 0
end

rb.bind(cfg.toggle, function()
  engaged = not engaged
  if engaged then
    idle_ms = 0
    rb.ui.notify("Joypad output on", "info")
  else
    release_all()
    rb.ui.notify("Joypad output off", "info")
  end
end)

for key in MOVE_KEYS do
  rb.bind(key, function()
    held[key] = true
  end, {
    when = function()
      return engaged
    end,
    release = function()
      held[key] = nil
    end,
  })
end

-- mouse buttons pull the triggers
local function click_trigger(button, axis)
  rb.bind(button, function()
    trigger[axis] = 1
  end, {
    when = function()
      return engaged
    end,
    release = function()
      trigger[axis] = 0
    end,
  })
end

click_trigger("Mouse1", "RT")
click_trigger("Mouse2", "LT")

rb.on("move", function(dx, dy)
  if not engaged then
    return true -- cursor works normally
  end
  acc_x += dx
  acc_y += dy
  return false
end)

rb.on("tick", function(dt_ms)
  if not engaged or dt_ms <= 0 then
    return
  end

  -- right stick: smoothed mouse velocity, so fast flicks are not clipped
  local keep = cfg.smoothing / 100
  local blend = 1 - keep
  rsx = rsx * keep + clamp(acc_x / dt_ms * cfg.gain, -1, 1) * blend
  rsy = rsy * keep + clamp(acc_y / dt_ms * cfg.gain, -1, 1) * blend
  acc_x, acc_y = 0, 0
  if math.abs(rsx) < 0.02 then
    rsx = 0
  end
  if math.abs(rsy) < 0.02 then
    rsy = 0
  end

  -- left stick: WASD, diagonals scaled so they are not faster
  local lx, ly = 0, 0
  for key, dir in MOVE_KEYS do
    if held[key] then
      lx += dir.x
      ly += dir.y
    end
  end
  if lx ~= 0 and ly ~= 0 then
    lx, ly = lx * 0.7071, ly * 0.7071
  end

  local active = rsx ~= 0 or rsy ~= 0 or lx ~= 0 or ly ~= 0
    or trigger.LT > 0 or trigger.RT > 0
  idle_ms = if active then 0 else idle_ms + dt_ms
  if idle_ms >= IDLE_MS then
    if driving then
      rb.hid.joypad_reset()
      driving = false
    end
    return
  end

  driving = true
  rb.hid.axis("RightX", rsx)
  rb.hid.axis("RightY", rsy)
  rb.hid.axis("LeftX", lx)
  rb.hid.axis("LeftY", ly)
  rb.hid.axis("LT", trigger.LT)
  rb.hid.axis("RT", trigger.RT)
end)

rb.on("blur", release_all)
rb.on("stop", release_all)