#!/bin/tcsh -f

# Script which filters an interferogram and uses the filtered interferogram to compute coherence
# Option an argument "y" can be given to perform this operation for multi-looked data

#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# copyright: 2016 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
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

set CURDIR = `pwd` 
echo $CURDIR

# First argument controls if its multilook data
if ($#argv == 1) then
     set multi_look_flag = $argv[1]

     # Check if a valid argument was given
     if ("$multi_look_flag" != "y"  && "$multi_look_flag" != "n") then
          echo  first argument needs to be either "y" for multi-look data or "n" for original raw data
          exit 1
     endif
     if ("$multi_look_flag" == "y") then
          echo "Apply on multi-looked data"
     endif
else
    set multi_look_flag = n
endif

# 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" ) then    
        # do not overwrite existing the files
        set overwrite = 0
        echo Will not overwrite existing files 
    endif
endif
        


# default filenames
set file_in = isce_minrefdem.int
set file_out = isce_minrefdem_filt.int 
set file_coh_out = isce_minrefdem_filt.coh

# in case of multi-looked data then get the filename
if ( "$multi_look_flag" == "y") then
    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 "az_looks will over-rule the ar to calculate the number of az_looks" 
    else
        # computing the azimuth looks based on the aspect ratio
        @ a_looks = $ar * $r_looks            
    endif
    
    # defining the output name based on the number of looks taken
    set filename_out = `basename $file_in | cut -d. -f1`
    set extension_out = `basename $file_in | cut -d. -f2`
    set file_in = {$filename_out}_{$r_looks}l.{$extension_out}
    set file_out = {$filename_out}_filt_{$r_looks}l.{$extension_out}
    set file_coh_out = {$filename_out}_filt_{$r_looks}l.coh
endif

# retrieve the current slave data folder being processed
set date = `basename $CURDIR`

# I included to be in the slave data folder, such one can reprocess easily without the need to manually specify the inputs
# move dir above
cd ..

# making the interferometric pair
# skip the run in case the user does not want to overwrite files     
if ( -f $date/$file_out & -f $date/$file_coh_out & $overwrite == 0 ) then
    # nothing to be done, file exist and user does not want to overwrite it
    echo $file_out and $file_coh_out exist, will not overwrite on user request
else
    #make sure to update the vrt file as it could have wrong meta data                                 #
    #    cd $date
    #   rm ${file_in}.vrt
    #   isce2gis.py vrt -i $file_in
    #   cd ..

    echo FilterAndCoherence.py -i $date/$file_in -f $date/$file_out -c $date/$file_coh_out  -s 0.6  >> processing.log
    echo FilterAndCoherence.py -i $date/$file_in -f $date/$file_out -c $date/$file_coh_out -s 0.6
    FilterAndCoherence.py -i $date/$file_in -f $date/$file_out -c $date/$file_coh_out -s 0.6
endif