--- TLbind v1.3, a simple system for creating professional control schemes
-- @author Taehl (SelfMadeSpirit@gmail.com), with contributions from smrq


local update
--- Gives a new instance of TLbind settings and control.
-- Good for OOP, multi-player split-screen with their own controls, etc.
-- Use: P1.bind, P1.control = TLbind.giveInstance( aTableOfBinds )
-- @param binds table specifies inputs, controls, and settings
-- @return b, a fresh new control instance (for changing settings)
-- @return b.control, the table to check if a control is being used
-- @return b.control.tap, where controls are only true for one frame when first used
-- @return b.control.release, where controls are only true for one frame when released
local function giveInstance( binds )
  --- The binds table specifies inputs, controls, and settings
  -- @class table
  -- @name binds
  -- @field useKeyboard if true, process keyboard input
  -- @field useMouse if true, process mouse input
  -- @field useJoystick if true, process joystick input
  -- @field deadzone clip analogue deadzoneAxes pairs to 0 when under this number (must be >= 0 and < 1)
  -- @field deadzoneAxes [index#] = {"analogue 1", "analogue 2"} (note: pairs will also be normalized, which fixes the common "running diagonally is faster" bug)
  -- @field keys [KeyConstant] = "control"
  -- @field mouseAxes {"x control", "y control"}
  -- @field mouseBtns [MouseConstant] = "control"
  -- @field joyAxes [joystick#][axis#] = "control"
  -- @field joyBtns [joystick#][button#] = "control"
  -- @field joyBalls [joystick#][ball#] = {"x control", "y control"}
  -- @field joyHats [joystick#][hat#] = {"l control", "r control", "u control", "d control"}
  -- @field maps [analogue] = {"negative digital", "positive digital"}
  local b = {
    useKeyboard = true, useMouse = false, useJoystick = true,
    deadzone = 0.1, keys = {}, mouseAxes = {}, mouseBtns = {},
    joyAxes = {}, joyBtns = {}, joyBalls = {}, joyHats = {},
    deadzoneAxes = {}, maps = {},
  }

  if binds then   -- use supplied binds, if given (safer to copy than directly reference!)
    local function tableCombine( a, b )
      local t = {}
      for k, v in pairs(a) do if type(v)=="table" then t[k]=tableCombine(v) else t[k]=v end end
      if b then for k, v in pairs(b) do if type(v)=="table" then t[k]=tableCombine(v) else t[k]=v end end end
      return t
    end
    b = tableCombine(b, binds)
  end
  b.update = update
  b.control = {tap={},release={}}

  -- The callbacks are .controlPressed and .controlReleased (they work just like Love's callbacks)
  -- Use: function TLbind.controlPressed(control) if control=="jump" then doJump() end end
  return b, b.control, b.control.tap, b.control.release
end


--- In love.update(), :update() on each bind instance.
-- You'll probably want to add TLbind:update() to your love.update().
-- @param b table a control instance, such as the default TLbind
update = function(b)
  local control, tap, release = b.control, b.control.tap, b.control.release
  -- Reset controls
  for k,v in pairs(control) do if type(v)~="table" then control[k] = false end end

  -- Check key inputs (if enabled)
  if b.useKeyboard then
    assert(love.keyboard, "TLbind was told to use keyboard input, but love.keyboard isn't available! (Check conf.lua)")
    for k,v in pairs(b.keys) do control[v] = control[v] or love.keyboard.isDown(k) end
  end

  -- Check joystick inputs (if enabled)
  if b.useJoystick then

    function register_joy ()
      local joysticks = love.joystick.getJoysticks()
      local joystick = joysticks[1]
      assert(joystick, "TLbind was told to use joystick input, but love.joystick isn't available! (Check conf.lua)")

      local lj = love.joystick
      for j,binds in pairs(b.joyAxes) do for k,v in pairs(binds) do control[v] = joystick:getAxis(j,k) end end
      for j,binds in pairs(b.joyBtns) do for k,v in pairs(binds) do control[v] = joystick:isDown(j,k) or control[v]  end end
      for j,binds in pairs(b.joyBalls) do for k,v in pairs(binds) do control[v[1]], control[v[2]] = lj.getBall(j,k) end end
      for j,binds in pairs(b.joyHats) do for k,v in pairs(binds) do
        local z = lj.getHat(j,k)
        if string.sub(z,1,1)=="l" then control[v[1]]=true elseif string.sub(z,1,1)=="r" then control[v[2]]=true end
        if string.sub(z,-1)=="u" then control[v[3]]=true elseif string.sub(z,-1)=="d" then control[v[4]]=true end
      end end
    end

    if pcall(register_joy) then
      -- print("Success")
    else
      -- print("Failure")
    end
  end

  -- Check mouse inputs (if enabled)
  if b.useMouse then
    assert(love.mouse, "TLbind was told to use mouse input, but love.mouse isn't available! (Check conf.lua)")
    for k,v in pairs(b.mouseBtns) do control[v] = control[v] or love.mouse.isDown(k) end

    -- Get screen metrics, to convert pixel coordinates into normals (treating the center of the screen as (0,0) )
    local w, h = love.graphics.getWidth(), love.graphics.getHeight()
    local ws, hs = w*.5, h*.5
    local wt, ht = ws, w*.5-(w-h)*.5
    -- Set mouse axes if they haven't already gotten input
    local mA1, mA2 = control[b.mouseAxes[1]], control[b.mouseAxes[2]]
    if not (mA1 or mA2) or (mA1==0 and mA2==0) then
      control[b.mouseAxes[1]], control[b.mouseAxes[2]] = (love.mouse.getX()-wt)/hs, (love.mouse.getY()-ht)/hs
    end
  end

  -- Impose digital controls onto analogue controls and vice versa (binding first if needed)
  for a,d in pairs(b.maps) do
    if not control[a] then control[a]=0 end
    if not control[d[1]] then control[d[1]]=false end
    if not control[d[2]] then control[d[2]]=false end
    if control[d[1]] then control[a]=-1 elseif control[d[2]] then control[a]=1 end
    if control[a]<0 then control[d[1]]=true elseif control[a]>0 then control[d[2]]=true end
  end

  -- Apply scaled radial deadzone on desired axis pairs (requires normalizing them too)
  for k,axes in pairs(b.deadzoneAxes or b.circleAnalogue) do  -- legacy support for circleAnalogue (now depreciated)
    local x, y = control[axes[1]], control[axes[2]]
    if x and y then
      local l = (x*x+y*y)^.5
      if l > 1 then x,y,l = x/l, y/l, 1 end
      if l<b.deadzone then control[axes[1]], control[axes[2]] = 0, 0
      else
        local n = ((l-b.deadzone)/(1-b.deadzone))
        control[axes[1]], control[axes[2]] = x*n, y*n
      end
    else
      -- print("TLbind can't deadzone unbound analogues! (deadzoneAxes."..k.." = { "..axes[1]..", "..axes[2].." }?)")
    end
  end

  -- Detect controls being tapped and released
  for k,v in pairs(control) do
    if v then
      release[k] = false
      if tap[k]==false then tap[k]=true if control.controlPressed then control.controlPressed(k) end
      elseif tap[k]==true then tap[k]=nil
      end
    else
      tap[k] = false
      if release[k]==false then release[k]=true if control.controlReleased then control.controlReleased(k) end
      elseif release[k]==true then release[k]=nil
      end
    end
  end
end


--- Default binds are assigned to global var TLbind
-- Example: Open a menu when escape is pressed
-- function love.load() TLbind.keys.escape = "menu" end
-- function love.update() if TLcontrol.tap.menu then openMenu() end end
TLbind = giveInstance({giveInstance=giveInstance})
return TLbind, TLbind.control, TLbind.control.tap, TLbind.control.release