#!/usr/bin/env bash

#
# EXAMPLES:
#
# run on only one year in test mode
# ./kh_rename 1980 1980 test | less
#
# run on only one year in actual move mode
# ./kh_rename 1980 1980
#
# run several years in test mode
# ./wend_rename 1980 2010 test | less
#
# run several years in actual move mode
# ./wend_rename 1947 1987
#
#This script will rename files from 19990101_DWN.pdf to wend_compo_fd_19990101_.pdf
#Years of data are 1947 - 1987

debug=0
start_year=1947
stop_year=1987
cwd=`pwd`

if [ -z "$1" ]; then
        echo "ERROR: no start year specified"
        echo "This script expects to be run from a top level directory, with folders of the form YYYY/MM below it"
        echo "USAGE: ${0} <start_year> <stop_year>"
        echo "EXAMPLE: ${0} 1980 1982"
fi

if [ -z "$2" ]; then
        echo "ERROR: no stop year specified"
        echo "This script expects to be run from a top level directory, with folders of the form YYYY/MM below it"
        echo "USAGE: ${0} <start_year> <stop_year>"
        echo "EXAMPLE: ${0} 1980 1982"
fi

if [ ! -z "${3}" ]; then
        debug=1
fi

start_year="${1}"
stop_year="${2}"

for yr in `seq ${start_year} ${stop_year}`

do
        for mo in `seq -w 01 12`
        do
                path="${yr}/${mo}"
                cd ${path}
                for file in *.pdf
                do
                        f1="`echo $file | sed 's/_/ /g' | awk '{print $1}'`"
                        f2="wend_compo_fd_$f1.pdf"
                        if [[ "${file}" =~ "wend.*" ]]
                        then
                        :
                        else
                            mv $file $f2
                        fi
                done
                cd ../..
        done
done