--- Devian - Dock.lua
-- @file-author@
-- @project-revision@ @project-hash@
-- @file-revision@ @file-hash@
-- Created: 12/26/2015 12:32 PM
-- Docking and arrangement calls

local D = LibStub("AceAddon-3.0"):GetAddon("Devian")
local ceil, floor, sqrt, pairs, GetScreenWidth, GetScreenHeight =  math.ceil, math.floor, math.sqrt, pairs, GetScreenWidth, GetScreenHeight
local UIFrameFadeIn, UIFrameFadeOut = UIFrameFadeIn, UIFrameFadeOut
local db

--- Spaces each frame evenly across the screen.
function D:DistributeFrames() --
  local max = self.num_channels
  local num_side = ceil(sqrt(max))
  local w = GetScreenWidth() / num_side
  local h = GetScreenHeight() / num_side
  for i, frame in pairs(D.console) do
    local dx = (i-1) % num_side
    local dy = floor((i-1) / num_side)
    frame.width = w
    frame.height = h
    frame.x = dx * w
    frame.y = -(dy * h)
    frame:Save()
  end
end

--- Place all frames stacked beneath the primary frame.
function D:StackFrames()
  local last
  for _, frame in pairs(self.console) do
    if last then
      frame.x = last.x
      frame.y = last.y - 20
    else
      frame.x = (GetScreenWidth()-frame:GetWidth())/2
      frame.y = 0
    end
    frame:Save()
    last = frame
  end
end


--- Space everything and set the dock size
function D:UpdateDock()
  local pad_offset = 12
  local draw_offset = pad_offset
  for i = 1, #self.dock.buttons do
    local d = self.dock.buttons[i]
    d:SetPoint('TOPLEFT',  DevianDock, 'TOPLEFT', draw_offset, 0)
    draw_offset=  draw_offset + d:GetWidth() + pad_offset
  end
  self.dock:SetWidth(draw_offset)
end

--- Updates region visibility as needed
local getFadeInArgs = function(sign, region)
  --print('Dvn', region)
  local db = D.db
  local alph = region:GetAlpha()
  local a = (db[sign..'_alpha_on'] - alph)
  local b = (db[sign..'_alpha_on']-db[sign..'_alpha_off'])
  local dur = (a / b) * db[sign..'_fade_in']
  return dur, alph, db[sign..'_alpha_on']
end

local getFadeOutArgs = function(sign, region)
  local db = D.db
  local alph = region:GetAlpha()
  local a = (alph  - db[sign..'_alpha_off'])
  local b = (db[sign..'_alpha_on']-db[sign..'_alpha_off'])
  local dur = (a / b) * db[sign..'_fade_out']
  return dur, alph, db[sign..'_alpha_off']
end

function D.UpdateBeacon(beacon)
  local db = D.db
  local isActive = (beacon.raised or beacon.selected)
  if isActive then
    UIFrameFadeIn(beacon, getFadeInArgs('dock_button', beacon))
  end
  if beacon.showName or isActive then
    UIFrameFadeIn(beacon.caption, getFadeInArgs('dock_button', beacon.caption))
  end

  if not isActive then
    UIFrameFadeOut(beacon, getFadeOutArgs('dock_button', beacon))
  end
  if (not beacon.showName) and (not isActive) then
    UIFrameFadeOut(beacon.caption,getFadeOutArgs('dock_button', beacon.caption))
  end
end

--- Dock interactions
function D.DockHighlight(beacon)
  db = D.db
  local self = D.dock
  local mouseOverDock
  if self:IsMouseOver() then
    mouseOverDock = true
  end

  if beacon and beacon:IsMouseOver() then
    mouseOverDock = true
    if not beacon.raised then
      beacon.raised = true
      D.UpdateBeacon(beacon)
    end
  elseif beacon.raised and beacon.index ~= db.current_channel then
    beacon.raised = nil
    D.UpdateBeacon(beacon)
  end

  if mouseOverDock then
    -- Raise it up
    if not self.raised then
    self.raised = true
    UIFrameFadeIn(self, getFadeInArgs('dock', self))
    end
  elseif  self.raised then
    -- Drop it down
    self.raised = nil
    UIFrameFadeOut(self, getFadeOutArgs('dock', self))
  end

end