#!/bin/bash

deleteGPSData() {
    local directory=$1
    local overwrite_param=$2

    find "$directory" -type f | while IFS= read -r line; do
        echo "Processing file '$line'"
        exiftool -gps:all= "$line" "$overwrite_param"
    done
}

if ! [ -x "$(command -v exiftool)" ]; then
    echo 'Error: exiftool is not installed.' >&2
    echo 'Install exiftool before. See your distro documentation.' >&2
    exit 1
fi

echo '-------------------------------'
echo 'Success: exiftool is installed.'
echo '-------------------------------'
echo ''

# Ask for directory scan, if empty use ../public/photos
default_directory="../public/photos"
read -p "Please specify a subdirectory within $default_directory or press Enter to use the default: " user_directory
echo ''

if [ -z "$user_directory" ]; then
    target_directory="$default_directory"
else
    target_directory="$default_directory/$user_directory"

    if [[ ! -d "$target_directory" ]] || [[ "$target_directory" != "$default_directory"* ]]; then
        echo "Error: The directory you specified is invalid or outside of $default_directory."
        exit 1
    fi
fi

while true; do
    echo ''
    read -p "Are you sure you want to delete all GPS data from the files in $target_directory?
This operation is irreversible.
Do you want to continue ? [Y/N] " yesno
    echo ''
    case $yesno in
        [Yy]*)
            echo "You answered yes"

            # Ask user for overwrite original file
            echo ''
            read -p "Do you want to overwrite the original files? This cannot be undone. [Y/N] " overwrite
            echo ''
            case $overwrite in
                [Yy]*)
                    overwrite_param="-overwrite_original"
                    echo "You chose to overwrite the original files."
                    ;;
                [Nn]*)
                    overwrite_param=""
                    echo "You chose not to overwrite the original files."
                    ;;
                *)
                    echo "Invalid choice, defaulting to no overwrite."
                    overwrite_param=""
                    ;;
            esac

            deleteGPSData "$target_directory" "$overwrite_param"
            exit
            ;;
        [Nn]*)
            echo "You answered no, exiting"
            exit
            ;;
        *)
            echo "Answer either Y/y (Yes) or N/n (No)!"
            ;;
    esac
done