--Load and save plaintext line mesh format for DEFCON coastlines etc.
local t = {}
local lfs = love.filesystem
local lg = love.graphics

function t.load( filename )
  local polys = { visible = true }
  local poly = {}
  local n = 1
  local k = 1
  for line in assert( lfs.lines( filename ) ) do
    if line:find "b" then
      k = 1
      if #poly > 2 then n = n + 1 end
      poly = {}
      polys[n] = poly
    else
      local _, _, x, y = line:find( "(%g+)%s+(%g+)" )
      x, y = tonumber( x ), tonumber( y )
      if x and y then 
        poly[k], poly[ k + 1 ] = x, y
        k = k + 2
      else
        print( "LINES: malformed line:", filename, line )
      end
    end
  end
  
  if not polys[n] or (#(polys[n]) < 3) then
    polys[n] = nil
    n = n - 1
  end

  print( "LOADED", filename, n )
  return setmetatable( polys, {__index = t } )
end

function t.save( lines, filename )


end

function t.newPolygon( x, y )
  
end

function t.addToCurrentPolygon( x, y )
  
end

function t.deletePolygon( poly )
  
end

function t.drawPolygonEditHandles( poly )
  
end

function t.draw( lines )
  if not lines.visible then return end
  for _, poly in ipairs( lines ) do
    lg.line( poly )
  end
end

return t