local Tileset = require "core.modules.assets.tileset"
local Autotile = Object:extend()

function Autotile:new(filepath)
  self.tileset = Tileset(filepath)

  self.data    = require(filepath .. ".lua")
  self.metadata = self.data.metadata

  self.tilesize = self.metadata.width
end

function Autotile:drawtile(i, j, x, y, r, sx, sy, ox, oy, kx, ky)
  local i = i or 1
  local j = j or 1
  local tilesize = self.tilesize / 2
  i = (i - 1) * 2 + 1
  j = (j - 1) * 2 + 1
  self.tileset:drawTile_Grid(i    , j    , x           , y           , r, sx, sy, ox, oy, kx, ky)
  self.tileset:drawTile_Grid(i + 1, j    , x + tilesize, y           , r, sx, sy, ox, oy, kx, ky)
  self.tileset:drawTile_Grid(i    , j + 1, x           , y + tilesize, r, sx, sy, ox, oy, kx, ky)
  self.tileset:drawTile_Grid(i + 1, j + 1, x + tilesize, y + tilesize, r, sx, sy, ox, oy, kx, ky)
end

function Autotile:draw(x, y, w, h)
  local w = w or self.tilesize
  local h = h or self.tilesize
  w = math.max(math.floor(w / self.tilesize), 1)
  h = math.max(math.floor(h / self.tilesize), 1)
  local halfsize = self.tilesize / 2
  local tilesize = self.tilesize
  if (w == 1) then
    self.tileset:drawtile_Grid(1, 1, x                     , y)
    self.tileset:drawtile_Grid(1, 6, x                     , y + (h*2 - 1) * halfsize)
    self.tileset:drawtile_Grid(6, 1, x + (w*2 - 1) * halfsize, y)
    self.tileset:drawtile_Grid(6, 6, x + (w*2 - 1) * halfsize, y + (h*2 - 1) * halfsize)
    if (h > 1) then
      h = h - 1
      for i = 1, h do
        self.tileset:drawtile_Grid(1, 3, x, y + (i * tilesize) - halfsize)
        self.tileset:drawtile_Grid(6, 3, x + halfsize, y + (i * tilesize) - halfsize)

        self.tileset:drawtile_Grid(1, 4, x           , y + (i * tilesize))
        self.tileset:drawtile_Grid(6, 4, x + halfsize, y + (i * tilesize))
      end
    end
    -- draw just one stuff
  else
    if (h == 1) then
      self.tileset:drawtile_Grid(1, 1, x                     , y)
      self.tileset:drawtile_Grid(1, 6, x                     , y + (h*2 - 1) * halfsize)
      self.tileset:drawtile_Grid(6, 1, x + (w*2 - 1) * halfsize, y)
      self.tileset:drawtile_Grid(6, 6, x + (w*2 - 1) * halfsize, y + (h*2 - 1) * halfsize)
      w = w - 1
      for i = 1, w do
        self.tileset:drawtile_Grid(3, 1, x + (i * tilesize) - halfsize, y)
        self.tileset:drawtile_Grid(3, 6, x + (i * tilesize) - halfsize, y + halfsize)

        self.tileset:drawtile_Grid(4, 1, x + (i * tilesize)          , y )
        self.tileset:drawtile_Grid(4, 6, x + (i * tilesize), y +halfsize)
      end
    else
      self:drawtile(1, 1, x                     , y)
      self:drawtile(1, 3, x                     , y + (h - 1) * tilesize)
      self:drawtile(3, 1, x + (w - 1) * tilesize, y)
      self:drawtile(3, 3, x + (w - 1) * tilesize, y + (h - 1) * tilesize)
      w = w - 2
      h = h - 2
      for i=1, w do
        self:drawtile(2, 1, i * tilesize, y)
        self:drawtile(2, 3, i * tilesize, y + (h + 1) * tilesize)
        for j=1, h do
          self:drawtile(2, 2, i * tilesize, j * tilesize)
        end
      end

      for i=1, h do
        self:drawtile(1, 2, x                     , i * tilesize)
        self:drawtile(3, 2, x + (w + 1) * tilesize, i * tilesize)
      end
    end
  end
end

return Autotile