#! /usr/bin/ruby
# -*- coding: utf-8 -*-
#
# 2014/10/03 石渡正樹
#
# = fig_globalinteg.rb
# * 全球積分値を求める.
#
# == USAGE
#   % fig_globalinteg.rb --var=H2OLiq --time_start=731 --time_end=1095 --wsn=2
# == Calculation Method
#  \int q d \sigma = \int q d dp/ps
#                  = 1/ps \int q \rho g (dz)  
#                  = g/ps \int \rho q (dz) 
# よって, 求めたいのは
# \int \rho q (dz)  = ps/g \int q d \sigma



require 'getoptlong'
require "numru/ggraph"
include NumRu

ITR=1

## 定数設定
Grav = 9.8

RPlanet = 6.371e6

Pi = 3.1415926535897932

## オプション解析
parser = GetoptLong.new
parser.set_options(
                   ###    global option   ###
                   ['--var',                      GetoptLong::REQUIRED_ARGUMENT],
                   ['--time_start',                      GetoptLong::REQUIRED_ARGUMENT],
                   ['--time_end',                      GetoptLong::REQUIRED_ARGUMENT],
                   ['--area',                      GetoptLong::REQUIRED_ARGUMENT],
                   ['--wsn',                      GetoptLong::REQUIRED_ARGUMENT]
                   )
parser.each_option do |name, arg|
  eval "$OPT_#{name.sub(/^--/, '').gsub(/-/, '_')} = '#{arg}'"  # strage option value to $OPT_val
end

if $OPT_var == nil then
  p '--var must be specified.'
  exit
end
variable = $OPT_var
ncfile = $OPT_var + '.nc'
outncfile = 'VerticalIntegrated' + $OPT_var + '.nc'

wsn = ($OPT_wsn||4)

time_start = ($OPT_time_start||1).to_f
time_end = ($OPT_time_end||9999).to_f

area = ($OPT_area||'all')

## データ読み込み, 加工
Var = GPhys::IO.open(ncfile, variable).cut('time'=>time_start..time_end)
Ps = GPhys::IO.open('Ps.nc', 'Ps').cut('time'=>time_start..time_end)

sig = GPhys::IO.open(ncfile, 'sig')
lat = GPhys::IO.open(ncfile, 'lat')
lon = GPhys::IO.open(ncfile, 'lon')
time = GPhys::IO.open(ncfile, 'time').cut('time'=>time_start..time_end)

na_sig = sig.val
na_lon = lon.val
na_lat = lat.val
na_time = time.val

na_sig_weight = GPhys::IO.open(ncfile, 'sig_weight').val
na_lat_weight = GPhys::IO.open(ncfile, 'lat_weight').val

nsig = na_sig.size
nlon = na_lon.size
nlat = na_lat.size
ntime = na_time.size

# 鉛直積算の計算
gphys = Var *  na_sig_weight.reshape(1, 1 ,nsig, 1) / na_sig_weight.sum
vertical_integrated_data = gphys.sum('sig') * Ps / Grav
#vertical_integrated_data = vertical_integrated_data.mean('time')
vertical_integrated_data = vertical_integrated_data

# 空間平均の計算
global_integrated_data = vertical_integrated_data * na_lat_weight.reshape(1, nlat) / na_lat_weight.sum

if (area == 'all') then
  data = global_integrated_data.mean('lon').sum('lat')
  data = data * 4.0 * Pi * RPlanet * RPlanet
elsif (area == 'east') then
  data = global_integrated_data.cut('lon'=>180.0..360.0).mean('lon').sum('lat')
  data = data * 2.0 * Pi * RPlanet * RPlanet
elsif (area == 'west') then
  data = global_integrated_data.cut('lon'=>0.0..180.0).mean('lon').sum('lat')
  data = data * 2.0 * Pi * RPlanet * RPlanet
else
  p 'area is not set properly: area=', area
  exit
end

data = data.convert_units("kg")


# ファイル出力
#outfile = NetCDF.create(outncfile)
#GPhys::NetCDF_IO.write( outfile, data )
#outfile.close

# (2013-11-16 石渡)
# 場合によっては
# [BUG] Segmentation fault
# になってしまって, やむなく gpview を使うこともあった.
# exit

DCL.gropn(wsn)

# 描画準備
vx0,vx1,vy0,vy1 = 0.15,0.85,0.2,0.55
GGraph.set_fig 'itr'=>ITR, 'viewport'=>[vx0,vx1,vy0,vy1]

DCL.ugpset('LUMSG', false)   # no message

#  DCL.sgpset('lfull', true)     # 全画面表示
#  DCL.sgpset('lcntl', true)

  # オプションのデフォルト値の設定
  opt = {
    'legend'=>false, 'annotate'=>false,
    'title'=>'cloud water'
  }

   GGraph.line( data, true, opt )

DCL.grcls