#!/bin/tcsh -f

# Script which make an interferometric combination between secondary and reference

#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# copyright: 2017 to the present, california institute of technology.
# all rights reserved. united states government sponsorship acknowledged.
#
# THESE SCRIPTS ARE PROVIDED TO YOU "AS IS" WITH NO WARRANTIES OF CORRECTNESS. USE AT YOUR OWN RISK.
#
# Author: David Bekaert
# Organization: Jet Propulsion Laboratory, California Institute of Technology
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

# check if existing files needs to be overwritten or not
set input = input_file
set counter = 1
while ($counter  <= 10)
    if ( ! -f $input ) then
        set input = ../$input
    else
        @ counter = $counter + 10000
    endif
    @ counter = $counter + 1
end                       

                            
set overwrite = 1
if ( -f $input ) then
    set overwrite_flag = `grep overwrite $input | awk '{print $2}'`
    if ( $overwrite_flag == "n" | $overwrite_flag == "no" ) then    
        # do not overwrite existing the files
        set overwrite = 0
        echo Will not overwrite existing files 
    endif

    # getting the multi-look information
    set r_looks = `grep range_looks $input | awk '{print $2}'`
    set ar = `grep aspect_ratio $input | awk '{print $2}'`
    set a_looks = `grep azimuth_looks $input | awk '{print $2}'`

    if ( $a_looks != "" ) then
        echo "azimuth_looks will over-rule the ar"    
    else
        # computing the azimuth looks based on the aspect ratio
        @ a_looks = $ar * $r_looks
    endif
else
    echo Could not find the input_file with all the processing parameters
    exit 1
endif



    
# giving a summary to the user
echo number of range looks: $r_looks
echo number of azimuth looks: $a_looks
    
# User can specify a file to be multi-looked (as long as its ISCE processed with corresponding xml)
# by default no inputs are assumed and then its the intergerogram which is multi-looked
if ($#argv == 1) then
	# user inputed a file
        set file_in = $argv[1]
else
	# default ifgs multi-looking
	set CURDIR = `pwd` 
	echo $CURDIR
	
	# retrieve the current secondary data folder being processed
	set date = `basename $CURDIR`
	
	# I included to be in the secondary data folder, such one can reprocess easily without the need to manually specify the inputs
	# move dir above
	cd ..
	
	# defining the input interferogram that needs to be multi-looked
	set file_in = $PWD/$date/isce_minrefdem.int
endif
echo Multi-look: $file_in


# defining the output name based on the number of looks taken
set filename_out = `basename $file_in | cut -d. -f1`
set path_out = `dirname $file_in`
set extension_out = `basename $file_in | cut -d. -f2`
set file_out = {$path_out}/{$filename_out}_{$r_looks}l.{$extension_out}

	
# Doing the actual multi-looking
set curdir = `pwd`
if ($a_looks == 1 & $r_looks == 1) then
   echo no multi-looking needed, will make symbolic links
   set file_out_sym = {$filename_out}_{$r_looks}l.{$extension_out}
   set file_out_sym_xml = {$filename_out}_{$r_looks}l.{$extension_out}.xml
   set file_out_sym_vrt = {$filename_out}_{$r_looks}l.{$extension_out}.vrt
   set file_in_sym = {$filename_out}.{$extension_out}
   set file_in_sym_xml = {$filename_out}.{$extension_out}.xml
   set file_in_sym_vrt = {$filename_out}.{$extension_out}.vrt

   cd $path_out
   # link the file and also the meta data if they exist
   rm ${file_out_sym} $file_out_sym_xml $file_out_sym_vrt >& /dev/null
   ln -s $file_in_sym $file_out_sym
   if ( -f "$file_in_sym_xml" ) then
      ln -s $file_in_sym_xml $file_out_sym_xml
   endif
   if ( -f "$file_in_sym_vrt" ) then
      ln -s $file_in_sym_vrt $file_out_sym_vrt
   endif
   cd $curdir
else
    # skip the run in case the user does not want to overwrite files
    if ( -f $file_out & $overwrite == 0 ) then
        # nothing to be done, file exist and user does not want to overwrite it
        echo $file_out exist, will not overwrite on user request
    else
       echo looks.py -i $file_in -o $file_out -r $r_looks -a $a_looks
       echo looks.py -i $file_in -o $file_out -r $r_looks -a $a_looks >> processing.log
       looks.py -i $file_in -o $file_out -r $r_looks -a $a_looks
       fixImageXml.py -f -i $file_out
   endif
endif