--------------------------------------------------------- dependencies  -- ;

local grect = require("gears.geometry").rectangle
local tabs = require("machina.tabs")
local geoms = require("machina.geoms")
local helpers = require("machina.helpers")

local get_client_ix = helpers.get_client_ix
local getlowest = helpers.getlowest
local compare = helpers.compare
local tablelength = helpers.tablelength
local set_contains = helpers.set_contains
local clear_tabbar = helpers.clear_tabbar

---------------------------------------------------------------- locals -- ;

local global_client_table = {}
local global_widget_table = {}

function get_global_clients()
   return global_client_table
end

function update_global_clients(c)
   global_client_table[c.window] = c
end

------------------------------------------------------------- go_edge() -- ;

local function go_edge(direction, regions, current_box)
   test_box = true
   edge_pos = nil

   while test_box do
      test_box = grect.get_in_direction(direction, regions, current_box)

      if test_box then
         current_box = regions[test_box]
         edge_pos = test_box
      end
   end

   return edge_pos
end --|
    --|figures out the beginning of each row on the layout.

----------------------------------------------------------- always_on() -- ;

local function toggle_always_on()
   always_on = nil or client.focus.always_on
   client.focus.always_on = not always_on
end

--------------------------------------------------------- screen_info() -- ;

local function screen_info(s)
   local s = s or awful.screen.focused()
   local focused_screen = s or nil
   local workarea = s.workarea or nil
   local selected_tag = s.selected_tag or nil
   local layout = awful.layout.get(s) or nil
   local focused_client = client.focus or nil

   return focused_screen,
      workarea,
      selected_tag,
      layout,
      focused_client
end

--------------------------------------------------------- get_regions() -- ;

local function get_regions(s)
   local s = s or awful.screen.focused()
   local focused_screen,
         workarea,
         selected_tag,
         layout,
         focused_client = screen_info(s)

   local machi_fn = nil
   local machi_data = nil
   local machi_regions = nil

   if layout.machi_get_regions then
      machi_fn = layout.machi_get_regions
      machi_data = machi_fn(workarea, selected_tag)
      machi_regions = machi_data
   end --|version 1

   if layout.machi_get_instance_data then
      machi_fn = layout.machi_get_instance_data
      machi_geom = layout.machi_set_geometry
      machi_data = {machi_fn(screen[focused_screen], selected_tag)}
      machi_regions = machi_data[3]
   
      for i=#machi_regions,1,-1 do
         if machi_regions[i].habitable == false  then
            table.remove(machi_regions, i)
         end
      end --|remove unhabitable regions

      table.sort(
         machi_regions,
         function (a1, a2)
            return a1.id > a2.id
         end
      ) --|v2 returns unordered region list and needs sorting.
   end --|version 2/NG

   return machi_regions, machi_fn
end

------------------------------------------------------- get_client_info -- ;

local function get_client_info(c)
   local c = c or client.focus or nil
   local s = s or c.screen or nil
   local source_client = c
   local active_region = nil
   local outofboundary = nil
   local proximity = {}

   if not source_client then return {} end
   --|flow control

   if source_client.x < 0 or source_client.y < 0 
      then outofboundary = true 
   end --| negative coordinates always mean out of boundary

   local regions = get_regions(s)
   --|get regions on the screen
   
   if not regions then return {} end
   --|flow control

   for i, a in ipairs(regions) do
      local px = a.x - source_client.x
      local py = a.y - source_client.y

      if px == 0 then px = 1 end
      if py == 0 then py = 1 end

      proximity[i] = {
         index = i,
         v = math.abs(px * py)
      } --│keep track of proximity in case nothing matches in
        --│this block.

   end --│figures out focused client's region under normal
       --│circumstances.

   if not active_region then
      table.sort(proximity, compare)       --| sort to get the smallest area
      active_region = proximity[1].index   --| first item should be the right choice

      if source_client.floating then
         if regions[active_region].width - source_client.width ~= 0
            or regions[active_region].height - source_client.height ~= 0
         then
            outofboundary = true
         end
      end --|when client is not the same size as the located
          --|region, we should still consider this as out of
          --|boundary
   end --|user is probably executing get_active_regions on a
       --|floating window.

   if not active_region then
      active_region = 1
   end --|at this point, we are out of options, set the index
       --|to one and hope for the best.


   -- refactor
   if active_region and source_client.width > regions[active_region].width then
      outofboundary = true
   end --|machi sometimes could auto expand the client, consider
       --|that as out of boundary.

   if active_region and source_client.height > regions[active_region].height then
      outofboundary = true
   end --|machi sometimes could auto expand the client, consider
       --|that as out of boundary.
   -- refactor

   active_region_geom = {
      width=regions[active_region].width-regions[active_region].width/2,
      height=regions[active_region].height-regions[active_region].height/2
   }

   return {
      active_region = active_region,
      active_region_geom = active_region_geom,
      regions = regions,
      outofboundary = outofboundary
   }
end

------------------------------------------------------------- move_to() -- ;

local function move_to(location)
   return function()
      local useless_gap = nil
      local regions = get_regions()
      local edges = {x={},y={}}
      local is = {
         region=get_client_info(client.focus).active_region
      }

      for i,region in ipairs(regions) do
         edges.x[region.x] = region.x + region.width
         edges.y[region.y] = region.y + region.height
      end
      
      useless_gap = getlowest(edges.x)
      client.focus:geometry(geoms[location](useless_gap))

      if not client.focus.floating then
         local tobe = {
            region=get_client_info(client.focus).active_region   
         }
         draw_tabbar(tobe.region)
         draw_tabbar(is.region)
         client.focus.region = tobe.region
      end --| redraw tabs and update meta

      return
   end
end

----------------------------------------- focus_by_direction(direction) -- ;

local function focus_by_direction(direction)
   return function()
      if not client.focus then return false end
      awful.client.focus.global_bydirection(direction, nil,true)
      client.focus:raise()
   end
end

----------------------------------------------- get_clients_in_region() -- ;

local function get_clients_in_region(region_ix, c, s)
   local s = s or c.screen or awful.screen.focused()
   local c = c or client.focus or nil
   local source_client = c or client.focus or nil
   local source_screen = s or (source_client and source_client.screen)
   local active_region = region_ix or nil
   local regions = get_regions(s)
   local region_clients = {}

   if not active_region then
      for i, a in ipairs(regions) do
         if a.x <= source_client.x and source_client.x < a.x + a.width and
            a.y <= source_client.y and source_client.y < a.y + a.height
         then
            active_region = i
         end
      end
   end --|if no region index was provided, find the 
       --|region of the focused_client.

   if not active_region then
      return
   end

   if #region_clients == 0 then
      for i, w in ipairs(s.clients) do
         if not (w.floating) then
            if math.abs(regions[active_region].x - w.x) <= 5  and
               math.abs(regions[active_region].y - w.y) <= 5
            then
               region_clients[#region_clients + 1] = w
               w.region = region_ix
               --|this basically will fix any inconsistency
               --|along the way.
            end
         end
      end --|try to get clients based on simple coordinates
   end

   if #region_clients == 0 then
      for i, cc in pairs(s.clients) do
         if cc.region == active_region 
            and regions[active_region].x == cc.x 
            and regions[active_region].y == cc.y 
            then
            region_clients[#region_clients + 1] = cc
         end
      end 
   end --| this logic compares c.region to global client index.
       --| if we somehow fail to update c.region somewhere
       --| shuffle shortcuts won't work with this one.

   if #region_clients == 0 then
      for _, cc in ipairs(s.clients) do
         if not (cc.floating) then
            if regions[active_region].x <= cc.x + cc.width + cc.border_width * 2 
               and cc.x <= (regions[active_region].x + regions[active_region].width) 
               and regions[active_region].y <= (cc.y + cc.height + cc.border_width * 2)
               and cc.y <= (regions[active_region].y + regions[active_region].height)
            then
               region_clients[#region_clients + 1] = cc
            end
         end
      end 
   end --|this logic works with coordinates more throughly but
       --|it also causes issues with overflowing
       --|(expanded) clients.

   return region_clients
end --|try to get clients in a region using three different
    --|algorithms.

----------------------------------------------------- expand_horizontal -- ;

local function expand_horizontal(direction)
   return function ()
      local c = client.focus
      local geom = nil

      if c.maximized_horizontal then 
         c.maximized_horizontal = false
      end --|reset toggle maximized state

      if c.direction == direction then
         c.direction = nil
         c.maximized_horizontal = false
         c.maximized_vertical = false

         if not c.floating then
            draw_tabbar(c.region)
            resize_region_to_client(c, true)
         end

         return
      end --|reset toggle when sending same shortcut
          --|consequitively

      local stuff = get_client_info()
      local target = grect.get_in_direction(direction, stuff.regions, client.focus:geometry())
      
      if not target and direction ~= "center" then return end -- flow control

      --▨▨▨
      if direction == "right" then
         tobe = {
            x=c.x,
            width=math.abs(stuff.regions[target].x + stuff.regions[target].width - c.x - 4),
            height=c.height,
            y=c.y
         }

         c.direction = direction
         c.maximized_horizontal = true
         c.maximixed_vertical = false

         gears.timer.delayed_call(function (c) 
            c:geometry(tobe)
            draw_tabbar(c.region)
            resize_region_to_client(c, {horizontal=true,vertical=false,direction=direction})
            -- clear_tabbar(c)
         end,c)
         return
      end

      --▨▨▨
      if direction == "left" then
         tobe = {
            x=stuff.regions[target].x,
            width=c.x + c.width - stuff.regions[target].x,
            height=c.height,
            y=c.y
         }
         c.direction = direction
         c.maximized_horizontal = true
         c.maximixed_vertical = false

         gears.timer.delayed_call(function (c) 
            client.focus:geometry(tobe)
            draw_tabbar(c.region)
            clear_tabbar(c)
            resize_region_to_client(c, {horizontal=true,vertical=false,direction=direction})
         end,c)
         return
      end
     
      --▨▨▨
      if direction == "center" then
         c.maximized = false
         c.maximixed_vertical = false
         fixedchoice = geoms.clients[c.class] or nil

         if c.floating then
            c.maximized_horizontal = false
            geom = geoms.crt43()
         end

         if not c.floating then
            c.direction = "center"
            c.maximized_horizontal = true
            geom = geoms.p1080()
         end

         if fixedchoice then
            c.direction = "center"
            c.maximized_horizontal = true
            geom = fixedchoice()
         end

         c:geometry(geom)
         awful.placement.centered(c)

         gears.timer.delayed_call(function (c)
            c:raise()
            client.emit_signal("tabbar_draw", c.region)
            clear_tabbar(c)
         end,c) --|give it time in case maximize_horizontal is
              --|adjusted before centering
         return
      end
   end
end
--|c.direction is used to create a fake toggling effect.
--|tiled clients require an internal maximized property to
--|be set, otherwise they won't budge.

----------------------------------------------------- expand_vertical() -- ;

local function expand_vertical()
   local c = client.focus
   local going = "down"

   if c.maximized_vertical then 
      c.maximized_vertical = false
      return
   end --|reset toggle maximized state

   local stuff = get_client_info()
   local target = grect.get_in_direction("down", stuff.regions, client.focus:geometry())
   
   if target and stuff.regions[target].x ~= c.x then
      return
   end --|flow control
       --|ensure we are operating in the same X axis,
       --|vertical directions jump around

   if not target then
      going = "up"
      target = grect.get_in_direction("up", stuff.regions, client.focus:geometry())
   end --|flow control
       --|try reverse direction

   if not target then return end
   --|flow control
   
   if going == "down" then
      tobe = {
         y=c.y,
         x=c.x,
         width=c.width,
         height=stuff.regions[target].y + stuff.regions[target].height - c.y
      }
   end

   if going == "up" then
      tobe = {
         x=c.x,
         width=c.width,
         y=stuff.regions[target].y,
         height= c.height + c.y - stuff.regions[target].y
      }
   end

   c.maximized_vertical = true

   gears.timer.delayed_call(function () 
      client.focus:geometry(tobe)   
      client.focus:raise()
   end)

   return
end

------------------------------------------------------------- shuffle() -- ;

local function shuffle(direction)
   return function()
      local tablist = get_tiled_clients()
      --|this is the ordered list

      if not #tablist then return end
      --▨ flow control

      if not client.focus then return end
      --▨ flow control

      focused_client_ix = get_client_ix(client.focus.window, tablist)
      --|find the index position of the focused client

      if not focused_client_ix then return end
      --▨ flow control

      prev_ix = focused_client_ix - 1
      next_ix = focused_client_ix + 1
      --|calculate target indexes

      if next_ix > #tablist then next_ix = 1 end
      if prev_ix < 1 then prev_ix = #tablist end
      --|check for validity of the index

      if direction == "backward" then
         tablist[prev_ix]:emit_signal("request::activate", "mouse_enter",{raise = true})
         return
      end

      if direction == "forward" then
         tablist[next_ix]:emit_signal("request::activate", "mouse_enter",{raise = true})
         return
      end
   end
end

---------------------------------------------------------- get_swapee() -- ;

local function get_swapee(target_region_ix)
   local regions = get_regions()
   --| all regions

   local cltbl = awful.client.visible(client.focus.screen, true)
   --| all visible clients on all regions
   --| but we don't know which regions they are at
   
   local swap_map = {}

   for a,region in ipairs(regions) do
      for i,c in ipairs(cltbl) do
         if c.x == region.x and c.y == region.y then
            swap_map[a] = i
            break --|avoid stacked regions
         end
      end
   end --|iterate over regions, and match the client objects in
       --|each region.

   local swapee = cltbl[swap_map[target_region_ix]]
   return swapee
end
--[[
   returns the client object at a specific region. we can
   also use signals to keep track of this but we are trying
   to avoid exessive use of signals.
--]]

---------------------------------------------------------- my_shifter() -- ;

local function reset_client_meta(c)
   c.maximized = false
   c.maximized_horizontal = false
   c.maximized_vertical = false
   c.direction = nil
   return c
end

local function my_shifter(direction, swap)
   return function()

      if direction == "left" then direction = "backward" end
      if direction == "right" then direction = "forward" end

      local c = client.focus
      local stuff = get_client_info()
      local client_region_ix = stuff.active_region
      local source_region
      local target_region_ix
      local target_region

      c = reset_client_meta(c)
      --|clean artifacts in case client was expanded.
   
      if direction == "backward" then
         if (client_region_ix + 1) > #stuff.regions then 
            target_region_ix = 1
         else
            target_region_ix = client_region_ix+1
         end
      end --|go next region by index, 
          --|if not reset to first

      if direction == "forward" then
         if (client_region_ix - 1) < 1 then 
            target_region_ix = #stuff.regions
         else
            target_region_ix = client_region_ix - 1
         end
      end --|go previous region by index,
          --|if not reset to last

      if stuff.outofboundary then
         target_region_ix = client_region_ix
      end --|ignore previous when out of boundary
          --|probably floating or expanded client
          --|push inside the boundary instead

      source_region = stuff.regions[client_region_ix]
      target_region = stuff.regions[target_region_ix]
      --|target regions geometry

      local swapee = get_swapee(target_region_ix)
      --|visible client at the target region

      c:geometry(target_region)
      --|relocate client

      c.region = target_region_ix
      --|update client property

      if not swap then c:raise() end
      --|raise

      if swap and swapee then
         swapee:geometry(source_region)
         swapee:emit_signal("request::activate", "mouse_enter",{raise = true})
      end --|perform swap

      draw_tabbar(target_region_ix)
      resize_region_to_index(target_region_ix, target_region, true)
      --|update tabs in target region
      
      draw_tabbar(client_region_ix)
      resize_region_to_index(client_region_ix, source_region, true)
      --|update tabs in source region
   end   
end

---------------------------------------------------- shift_by_direction -- ;

local function shift_by_direction(direction, swap)
   return function ()

      local c = client.focus
      local stuff = get_client_info()
      local target_region_ix = nil
      local client_region_ix = stuff.active_region

      if stuff.outofboundary == true then
         return my_shifter(direction)()
      end --|my_shifter handles this situation better.

      local candidate = {
         up = grect.get_in_direction("up", stuff.regions, client.focus:geometry()),
         down = grect.get_in_direction("down", stuff.regions, client.focus:geometry()),
         left = grect.get_in_direction("left", stuff.regions, client.focus:geometry()),
         right = grect.get_in_direction("right", stuff.regions, client.focus:geometry())
      }

      target_region_ix = candidate[direction]
      --|try to get a candidate region if possible

      if not target_region_ix then
         if direction == "right" then try = "left" end
         if direction == "left" then try = "right" end
         if direction == "down" then try = "up" end
         if direction == "up" then try = "down" end

         target_region_ix = go_edge(try, stuff.regions, client.focus:geometry())
      end --|go the beginning or the end if there is no
          --|candidate
      
      source_region = stuff.regions[client_region_ix]
      target_region = stuff.regions[target_region_ix]

      local swapee = get_swapee(target_region_ix)
      --|visible client at the target region

      c:geometry(target_region)
      --|relocate client

      c.region = target_region_ix
      --|update client property

      if not swap then c:raise() end
      --|raise

      if swap and swapee then
         swapee:geometry(source_region)
         swapee:emit_signal("request::activate", "mouse_enter",{raise = true})
         swapee.region = client_region_ix
      end --|perform swap, update meta

      draw_tabbar(target_region_ix)
      resize_region_to_index(target_region_ix, target_region, true)
      --|update tabs in target region
      
      draw_tabbar(client_region_ix)
      resize_region_to_index(client_region_ix, source_region, true)
      --|update tabs in source region
   end
end

----------------------------------------------------- get_tiled_clients -- ;

function get_tiled_clients(region_ix, s)
   local s = s or client.focus.screen or awful.screen.focused()
   local tablist = get_clients_in_region(region_ix, c, s)
   local all_clients = get_global_clients()
   local tiled_clients = {}
   local myorder = {}
   local window_ix = {}

   for i,t in ipairs(tablist) do
      window_ix[t.window] = true
   end

   local po = 1
   for i,c in pairs(all_clients) do
      if not c.floating and window_ix[c.window] then
            tiled_clients[po] = c
         po = po + 1
      end
   end

   return tiled_clients
end --[23]

-------------------------------------------------------- draw_tabbar() -- ;

function draw_tabbar(region_ix, s)
   local s = s or awful.screen.focused()
   local flexlist = tabs.layout()
   local tablist = get_tiled_clients(region_ix, s)

   if tablelength(tablist) == 0 then
      return
   end --|this should only fire on an empty region

   if tablelength(tablist) == 1 then
      clear_tabbar(tablist[1])
      return
   end --|reset tabbar titlebar when only
       --|one client is in the region.

   for cl_ix, cl in ipairs(tablist) do
      local flexlist = tabs.layout()
      global_widget_table[cl.window] = {}

      for cc_ix, cc in ipairs(tablist) do
         local buttons = gears.table.join(awful.button({}, 1, function() end))
         -- wid_temp
         global_widget_table[cl.window][cc_ix] = tabs.create(cc, (cc == cl), buttons, cl_ix)

         flexlist:add(global_widget_table[cl.window][cc_ix])
         flexlist.max_widget_size = 120
      end

      local titlebar = awful.titlebar(cl, {
         bg = tabs.bg_normal,
         size = tabs.size,
         position = tabs.position,
      })

      titlebar:setup{layout = wibox.layout.flex.horizontal, flexlist}
      awful.titlebar(cl, {size=8, position = "top"})
      awful.titlebar(cl, {size=0, position = "left"})
      awful.titlebar(cl, {size=0, position = "right"})
   end
end

------------------------------------------------------ resize_region_to -- ;

-- todo: can merge these later, this will have side effects
-- when using multipler monitors.

function resize_region_to_client(c, reset)
   if c.floating then return end
   --|we don't wan't interference

   local c = c or client.focus
   local tablist = get_tiled_clients(c.region)
   for i, w in ipairs(tablist) do
      if reset == true then 
         reset_client_meta(w)
      else
         w.maximized_horizontal = reset.horizontal
         w.maximized_vertical = reset.vertical
         w.direction = reset.direction
      end
      w:geometry(c:geometry())
   end
end

function resize_region_to_index(region_ix, geom, reset)
   local tablist = get_tiled_clients(region_ix)
   for c_ix, c in ipairs(tablist) do
      if reset == true then 
         reset_client_meta(c) 
      else
         c.maximized_horizontal = reset.horizontal
         c.maximized_vertical = reset.vertical
         c.direction = reset.direction
      end
      c:geometry(geom)
   end
end

----------------------------------------------------- teleport_client() -- ;

local function teleport_client(c,s)
   local c = c or client.focus
   local s = s or c.screen or awful.screen.focused()

   if not c then return true end
   --|flow control

   local is = {
      region=c.region or get_client_info(c).active_region,
      geom=c:geometry(),
      screen=c.screen
   } --|parameters before teleport

   if not c.floating then
      c:geometry({width=300, height=300})
   end --|to avoid machi's auto expansion (lu,rd) of tiled
       --|clients, resize them temporarily. they will be auto
       --|expanded to the region anyway.

   c:move_to_screen()
   --|teleport

   gears.timer.delayed_call(function (c) 
      local tobe = {
         region=get_client_info(c).active_region,
      }
      c.region = tobe.region
      draw_tabbar(c.region, c.screen)
      draw_tabbar(is.region, is.screen)
      c:emit_signal("request::activate", "mouse_enter",{raise = true})
   end,c)
end

------------------------------------------------------ signal helpers -- ;

local function manage_signal(c)
   local ci = get_client_info(c)
   --|client info

   global_client_table[c.window] = c
   --|add window.id to client index

   if ci.active_region and not c.floating then
      gears.timer.delayed_call(function(region, screen, p)
         p.region = region
         draw_tabbar(region, screen)
         c:geometry(ci.active_region_geom)
      end, ci.active_region, c.screen, c)
   end --|in case new client appears tiled
       --|we must update the regions tabbars.
end --[6] 

----------------------------------------------------;

local function unmanage_signal(c)
   if c then
      global_client_table[c.window] = nil
      --|remove window.id from client index

      global_widget_table[c.window] = nil
      --|remove window.id from widget index

      if not c.floating then
         local ci = get_client_info(c)
         if ci.active_region then 
            draw_tabbar(ci.active_region, c.screen)
         end
      end
   end
end --[7]

----------------------------------------------------;

local function selected_tag_signal(t)
   gears.timer.delayed_call(function(t)
      local regions = get_regions(t.screen)
         if regions and #regions then
            for i, region in ipairs(regions) do
               draw_tabbar(i, t.screen)
            end
         end
   end,t)
end --[8]

----------------------------------------------------;

local function floating_signal(c)
   if c.floating then
      if c.region then
         gears.timer.delayed_call(function(active_region)
            clear_tabbar(c)
            draw_tabbar(c.region)
            c.region = nil
         end, active_region)
      end
   end --|window became floating

   if not c.floating then
      local ci = get_client_info(c)
      if ci.active_region then
         c.region = ci.active_region
         gears.timer.delayed_call(function(active_region)
            draw_tabbar(active_region)
         end, ci.active_region)
      end
   end --|window became tiled
end --[9]

----------------------------------------------------;

local function focus_signal(c)
   if global_widget_table[c.window] then
      for i, p in pairs(global_widget_table[c.window]) do
         if p.focused then
            local widget = global_widget_table[c.window][i]:get_children_by_id(c.window)[1]
            widget.bg = "#43417a"
         end
      end
   end
end

----------------------------------------------------;

local function unfocus_signal(c)
   if global_widget_table[c.window] then
      for i, p in pairs(global_widget_table[c.window]) do
         if p.focused then
            p.bg = "#292929"
            break
         end
      end
   end
end

----------------------------------------------------;

local function minimized_signal(c)
   if c.minimized then unmanage_signal(c) end
   if not c.minimized then manage_signal(c) end 
end --[[ manage minimized and not minimized ]]

----------------------------------------------------;

local function name_signal(c)
   if widget_ix[c.window] then
      for i, p in pairs(widget_ix[c.window]) do
         if p.focused then
            widget = widget_ix[c.window][i]:get_children_by_id(c.window)[1]
            widget.widget.markup = c.name
         end
      end
   end
end -- todo: need to update the other clients in the region here as well
    -- this may not even be worth it as the client names kind of pollute the
    -- tabs a lot making it harder to distinguish what is what.
    -- client.connect_signal("property::name", name_signal)


--------------------------------------------------------------- signals -- ;

client.connect_signal("focus", focus_signal)
client.connect_signal("unfocus", unfocus_signal)
client.connect_signal("property::minimized", minimized_signal)
client.connect_signal("property::floating", floating_signal)
client.connect_signal("tabbar_draw", draw_tabbar)
client.connect_signal("unmanage", unmanage_signal) 
client.connect_signal("manage", manage_signal)
tag.connect_signal("property::selected", selected_tag_signal)

--------------------------------------------------------------- exports -- ;

module = {
   focus_by_direction = focus_by_direction,
   get_active_regions = get_client_info,
   shift_by_direction = shift_by_direction,
   expand_horizontal = expand_horizontal,
   shuffle = shuffle,
   old_shuffle = old_shuffle,
   my_shifter = my_shifter,
   expand_vertical = expand_vertical,
   move_to = move_to,
   get_regions = get_regions,
   toggle_always_on = toggle_always_on,
   draw_tabbar = draw_tabbar,
   get_global_clients = get_global_clients,
   update_global_clients = update_global_clients,
   get_client_info = get_client_info,
   teleport_client = teleport_client,
}

return module


--[[ ------------------------------------------------- NOTES ]

  [4] machi's own region expansion has issues on
  awesome-reload. if we were to expand a region, and then
  do reload, machi-layout would insist to keep the expanded
  layout in its own accord.

  [5] to avoid this, we temporarily set the non floating
  clients region geometry. 

  [4] when the clients become float, we restore this
  geometry. Do note, there is something awkward here, it
  appears no matter what all clients start as float then
  get tiled, so there is a flaw in this logic.

  [9] when windows switch between float and tiled we must
  perform necessary maintenance on the destination and
  source regions. a delayed call was necessary when clients
  become tiled to give awm enough time to draw the widgets
  properly. (*)this floating signal acts weird during
  configuration reloads.

  [8] property::selected gets called the last, by the time
  we are here, we already have the global_client_list to
  draw tabbars. This may appear redundant here, but it's
  good to have this fire up in case the user switches
  tags.

  [7] when removing a tiled client we must update the
  tabbars of others. floating clients do not require any
  cleanup.


  [6] global_client_table is the milestone the tabbars rely
  on. whenever a new client appears we must add to it, and
  when a client is killed we must make sure it is
  removed. 

  [23] global_client_index stores the ordered list of all
  clients available and it is used as a blueprint to keep
  the order of our tablist intact, without this, tabbars
  would go out of order when user focuses via shortcuts
  (run_or_raise).

--]]