#!/usr/bin/env ruby

# Copyright (C) 2007-2011 Martin A. Hansen.

# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

# http://www.gnu.org/copyleft/gpl.html

# >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

# Plot the distribution of numerical values for a specified key.

# >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<


require 'maasha/biopieces'
require 'gnuplot'
require 'pp'

terminals = "dumb,x11,aqua,post,pdf,png,svg"
title     = "Distribution"
ylabel    = "n"

casts = []
casts << {:long=>'key',        :short=>'k', :type=>'string', :mandatory=>true,  :default=>nil,    :allowed=>nil,       :disallowed=>nil}
casts << {:long=>'no_stream',  :short=>'x', :type=>'flag',   :mandatory=>false, :default=>nil,    :allowed=>nil,       :disallowed=>nil}
casts << {:long=>'data_out',   :short=>'o', :type=>'file',   :mandatory=>false, :default=>nil,    :allowed=>nil,       :disallowed=>nil}
casts << {:long=>'terminal',   :short=>'t', :type=>'string', :mandatory=>false, :default=>'dumb', :allowed=>terminals, :disallowed=>nil}
casts << {:long=>'title',      :short=>'T', :type=>'string', :mandatory=>false, :default=>title,  :allowed=>nil,       :disallowed=>nil}
casts << {:long=>'xlabel',     :short=>'X', :type=>'string', :mandatory=>false, :default=>nil,    :allowed=>nil,       :disallowed=>nil}
casts << {:long=>'ylabel',     :short=>'Y', :type=>'string', :mandatory=>false, :default=>ylabel, :allowed=>nil,       :disallowed=>nil}
casts << {:long=>'logscale_y', :short=>'L', :type=>'flag',   :mandatory=>false, :default=>nil,    :allowed=>nil,       :disallowed=>nil}

options = Biopieces.options_parse(ARGV, casts)

key = options[:key].to_sym

options[:xlabel] = key unless options[:xlabel]
options[:ylabel] = "log10(#{options[:ylabel]})" if options[:logscale_y]

count_hash = Hash.new(0)

Biopieces.open(options[:stream_in], options[:stream_out]) do |input, output|
  input.each_record do |record|
    if record[key]
      count_hash[record[key].to_i] += 1
    end

    output.puts record unless options[:no_stream]
  end
end

x_max = count_hash.keys.max

x = []
y = []

(0 .. x_max).each do |i|
  x << i
  y << count_hash[i]
end

Gnuplot.open do |gp|
  Gnuplot::Plot.new(gp) do |plot|
    plot.terminal options[:terminal]
    plot.title    options[:title]
    plot.xlabel   options[:xlabel]
    plot.ylabel   options[:ylabel]
    plot.output   options[:data_out] if options[:data_out]
    plot.logscale "y"                if options[:logscale_y]
    plot.xrange   "[#{x.min - 1}:#{x.max + 1}]"
    plot.style    "fill solid 0.5 border"
    plot.xtics    "out"
    plot.ytics    "out"
    
    plot.data << Gnuplot::DataSet.new([x, y]) do |ds|
      ds.with = "boxes"
      ds.notitle
    end
  end
end


# >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<


__END__