module Flammarion
  # A representation of a plot in a writeable area. See {Writeable#plot}
  class Plot
    attr_reader :engraving
    def initialize(*args)
      if args.size == 0 then
        @engraving = Engraving.new
        @id = @engraving.make_id
        @target = "default"
      elsif args.size == 3 then
        id, target, engraving = args
        @id = id
        @target = target
        @engraving = engraving
      else
        raise ArgumentError.new("ArgumentError: wrong number of arguments (#{args.size} for 0 or 3)")
      end
    end

    def plot(data, options = {})
      if data.respond_to?(:keys)
        options = options.merge(data)
        if data.include?(:xy) then
          data = data.clone
          data[:x] = data[:xy].map(&:first)
          data[:y] = data[:xy].map(&:last)
          data.delete(:xy)
        end
        data = [data]
      elsif not data.first.respond_to?(:keys)
        data = [{y:data, x:(1..data.size).to_a}.merge(options)]
      end
      @engraving.send_json({action:'plot', id:@id, target:@target, data:data}.merge(options))
    end

    def to_svg
      svg = nil
      @engraving.script(%|$('#plot-i9').find('svg')[0].outerHTML|, coffee:false) {|r| svg = r['result'] || "Error"}
      sleep(0.1) while svg.nil?
      return svg
    end

    def layout(options)
      @engraving.send_json({action:'plot', id:@id, target: @target, layout: options})
    end
  end
end