#!/bin/bash -e

# Name    : import-photos
# Summary : Import & sort photos in a given directory
# Author  : George Rawlinson
# Depends : error, exiftool, mktemp

# constants
readonly LIBRARY_DIRECTORY="$HOME/Photos" # location of photo library
readonly PHOTO_EXTENSION="cr2"             # photo extension (Canon RAW)
readonly PHOTO_LIMIT=9999                  # limit on photos to process
readonly DEBUG_FLAG=0                      # used to test exiftool

# check dependencies
count=0
for dependency in error exiftool mktemp
do
    # list missing dependencies
    if [ ! -x "$(command -v $dependency)" ]; then
        echo "$dependency missing"
        count=$((count+1))
    fi
done

# exit script if any dependencies missing
if [ $count -ne 0 ]; then
    exit 1
fi

# check number of arguments - should be 1
if [ ! $# -eq 1 ]; then
    error "Expected 1 argument: directory"
    exit 1
fi

# get source directory
source_directory="$1"

# check if source directory exists
if [ ! -d "$source_directory" ]; then
    error "Directory does not exist"
    exit 1
fi

# get number of photos
num_photos=$(count-extdir "$source_directory" "$PHOTO_EXTENSION")

# check numbers
if [ "$num_photos" -gt "$PHOTO_LIMIT" ]; then
    error "Too many photos to import"
    exit 1
elif [ "$num_photos" -eq 0 ]; then
    echo "No photos to import"
    exit 0
fi

# create temporary directory
echo "Creating temporary directory"
temporary_directory=$(mktemp -d -p /tmp photos.XXXXXX)
# mktemp flags
# u - dry run
# d - make directory
# p - make in given dir
# photos.XXXXXX - create folder titled photos.XXXXXX where X = random characters

# copy photos to temporary directory
echo "Copying $num_photos photos to temporary directory"
cp -R "$source_directory" "$temporary_directory"

# import photos to library
echo "Importing $num_photos photos"

if [ "$DEBUG_FLAG" -eq 1 ]; then
    # shellcheck disable=SC2016
    exiftool -fileOrder DateTimeOriginal -recurse -verbose '-testname<${DateTimeOriginal}-${SerialNumber}%-.4nc.%e' -d "$LIBRARY_DIRECTORY"/%Y/%Y-%m-%d/%Y%m%d -ext cr2 "$temporary_directory"
else
    # shellcheck disable=SC2016
    exiftool -fileOrder DateTimeOriginal -recurse -quiet '-FileName<${DateTimeOriginal}-${SerialNumber}%-.4nc.%e' -d "$LIBRARY_DIRECTORY"/%Y/%Y-%m-%d/%Y%m%d -ext cr2 "$temporary_directory"
fi
# exiftool flags
# fileOrder DateTimeOriginal - before moving, sort in chronological order
# recurse + verbose/quiet - recursive search + verbose/quiet output
# testname/FileName - name of the output file (testname used for dry runs)
    # DateTimeOriginal - YYYYMMDD (date format set in -d flag below)
    # SerialNumber     - camera serial number
    # -.4nc.%e         - sequential 4 digit number starting at 0001, followed by extension
    # d - directory to save to
        # - DIR/YYYY/YYYY-MM-DD/FileName (set using this flag + testname/FileName)
# ext only match if ext=cr2 (Canon RAW)

# delete temporary directory
echo "Deleting temporary directory"
rm -rf "$temporary_directory"

# done!
echo "All done!"

exit 0