#!/bin/sh

NAME="$(basename "$1")"
EXT="$(echo ${NAME##*.} | tr '[:upper:]' '[:lower:]')"
DIR="$(dirname "$1")"

# san
SED0="$(echo "$NAME" | sed -n "/^20[0-9]\{2\}-[0-9]\{2\}-[0-9]\{2\}_[0-9]\{2\}-[0-9]\{2\}-[0-9]\{2\}-[a-z]\{3\}\.$EXT/p")"
if [ ! -z "$SED0" ]
then
    echo "Skipping - matches name pattern already ($NAME)"
    exit 0
fi

EXIFDATES="$(exiftool -q -q \
                 -p '$modifyDate' \
                 -p '$createDate' \
                 -p '$dateTimeOriginal' \
                 -p '$FileModifyDate' \
                 "$1" \
           | grep "^20" \
           | cut -b 1-19 \
           | tr ':' '-' \
           | tr ' ' '_' \
       )"

SED1="$(echo "$NAME" | sed -n 's/.*\(20[0-9]\{2\}\)-\([0-9]\{2\}\)-\([0-9]\{2\}\)_\([0-9]\{2\}\)-\([0-9]\{2\}\)-\([0-9]\{2\}\).*/\1-\2-\3_\4-\5-\6/p')"
SED2="$(echo "$NAME" | sed -n 's/.*\(20[0-9]\{2\}\)\([0-9]\{2\}\)\([0-9]\{2\}\)_\([0-9]\{2\}\)\([0-9]\{2\}\)\([0-9]\{2\}\).*/\1-\2-\3_\4-\5-\6/p')"
SED3="$(echo "$NAME" | sed -n 's/.*\(20[0-9]\{2\}\)\([0-9]\{2\}\)\([0-9]\{2\}\)\([0-9]\{2\}\)\([0-9]\{2\}\)\([0-9]\{2\}\).*/\1-\2-\3_\4-\5-\6/p')"

PICK="$(for d in $EXIFDATES $SED1 $SED2 $SED3; do echo $d; done | sort -u | head -1)"

echo "Dates for: $1"

for e in $EXIFDATES
do echo "From EXIF:     " $e; done

for f in $SED1 $SED2 $SED3
do echo "From Filename: " $f; done

if [ -z "$PICK" ]
then
    echo "Skipping - no dates found"
else
    NEWNAME="$DIR/$PICK-$(pwgen -A -0 -1 3).$EXT"
    echo mv "$1" "$NEWNAME"
    mv "$1" "$NEWNAME"
fi
echo