# [WEBSITE]

supportedArgs(::GLVisualizeBackend) = [
    # :annotation,
    # :axis,
    # :background_color,
    # :color_palette,
    # :fillrange,
    # :fillcolor,
    # :fillalpha,
    # :foreground_color,
    # :group,
    # :label,
    # :layout,
    # :legend,
    # :linecolor,
    # :linestyle,
     :linetype
    #  :seriescolor, :seriesalpha,
    # :linewidth,
    # :linealpha,
    # :markershape,
    # :markercolor,
    # :markersize,
    # :markeralpha,
    # :markerstrokewidth,
    # :markerstrokecolor,
    # :markerstrokestyle,
    # :n,
    # :bins,
    # :nc,
    # :nr,
    # :pos,
    # :smooth,
    # :show,
    # :size,
    # :title,
    # :windowtitle,
    # :x,
    # :xlabel,
    # :xlims,
    # :xticks,
    # :y,
    # :ylabel,
    # :ylims,
    # :yrightlabel,
    # :yticks,
    # :xscale,
    # :yscale,
    # :xflip,
    # :yflip,
    # :z,
    # :tickfont,
    # :guidefont,
    # :legendfont,
    # :grid,
    # :surface
    # :levels,
  ]
supportedAxes(::GLVisualizeBackend) = [:auto, :left]
supportedTypes(::GLVisualizeBackend) = [:surface] #, :path, :scatter ,:steppre, :steppost, :sticks, :heatmap, :hexbin, :hist, :bar, :hline, :vline, :contour]
supportedStyles(::GLVisualizeBackend) = [:auto, :solid] #, :dash, :dot, :dashdot, :dashdotdot]
supportedMarkers(::GLVisualizeBackend) = [:none, :auto, :ellipse] #, :rect, :diamond, :utriangle, :dtriangle, :cross, :xcross, :star5] #vcat(_allMarkers, Shape)
supportedScales(::GLVisualizeBackend) = [:identity] #, :log, :log2, :log10, :asinh, :sqrt]
subplotSupported(::GLVisualizeBackend) = false

# --------------------------------------------------------------------------------------


function _initialize_backend(::GLVisualizeBackend; kw...)
  @eval begin
    import GLVisualize
    export GLVisualize
  end
end

# ---------------------------------------------------------------------------

immutable GLScreenWrapper
    window
end

function _create_plot(pkg::GLVisualizeBackend, d::KW)
  # TODO: create the window/canvas/context that is the plot within the backend (call it `o`)
  # TODO: initialize the plot... title, xlabel, bgcolor, etc

  # TODO: this should be moved to the display method?
  w=GLVisualize.glscreen()
  @async GLVisualize.renderloop(w)
  Plot(GLScreenWrapper(w), pkg, 0, d, KW[])
end


function _add_series(::GLVisualizeBackend, plt::Plot, d::KW)
  # TODO: add one series to the underlying package
  push!(plt.seriesargs, d)
  # TODO: this should be moved to the display method?
  x,y,z=map(Float32,d[:x]), map(Float32,d[:y]), map(Float32,d[:z].surf)
  GLVisualize.view(GLVisualize.visualize((x*ones(y)', ones(x)*y', z), :surface),plt.o.window)
  plt
end

function _add_annotations{X,Y,V}(plt::Plot{GLVisualizeBackend}, anns::AVec{@compat(Tuple{X,Y,V})})
  for ann in anns
    # TODO: add the annotation to the plot
  end
end

# ----------------------------------------------------------------

function _before_update_plot(plt::Plot{GLVisualizeBackend})
end

# TODO: override this to update plot items (title, xlabel, etc) after creation
function _update_plot(plt::Plot{GLVisualizeBackend}, d::KW)
end

function _update_plot_pos_size(plt::AbstractPlot{GLVisualizeBackend}, d::KW)
end

# ----------------------------------------------------------------

# accessors for x/y data

function getxy(plt::Plot{GLVisualizeBackend}, i::Int)
  # TODO:
  # series = plt.o.lines[i]
  # series.x, series.y
  nothing, nothing
end

function setxy!{X,Y}(plt::Plot{GLVisualizeBackend}, xy::Tuple{X,Y}, i::Integer)
  # TODO:
  # series = plt.o.lines[i]
  # series.x, series.y = xy
  plt
end

# ----------------------------------------------------------------

function _create_subplot(subplt::Subplot{GLVisualizeBackend})
  # TODO: build the underlying Subplot object.  this is where you might layout the panes within a GUI window, for example
end

function _expand_limits(lims, plt::Plot{GLVisualizeBackend}, isx::Bool)
  # TODO: call expand limits for each plot data
end

function _remove_axis(plt::Plot{GLVisualizeBackend}, isx::Bool)
  # TODO: if plot is inner subplot, might need to remove ticks or axis labels
end

# ----------------------------------------------------------------

function Base.writemime(io::IO, ::MIME"image/png", plt::AbstractPlot{GLVisualizeBackend})
  # TODO: write a png to io
end

function Base.display(::PlotsDisplay, plt::Plot{GLVisualizeBackend})
  # TODO: display/show the plot

  # NOTE: I think maybe this should be empty?  We can start with the assumption that creating
  #       and adding to a plot will automatically open a window and draw to it, then the display
  #       wouldn't actually need to do anything
end

function Base.display(::PlotsDisplay, plt::Subplot{GLVisualizeBackend})
  # TODO: display/show the subplot
end