#!/bin/bash
function choosefile {
        # ask filename
        echo "Choose a file name to work with and press enter"
        read file
        echo " "
        echo "We will work with $file "
        echo " "
}

function createfile {
    # create file
        echo "create $file"
        touch $file
}

function deletefile {
        echo "delete $file"
        rm $file    # delete file
}

function addpermition {   # give permisions to file (R,W,X)
        echo "Enter R to give read permition, W for write, X to execute ?"
        select i in R W X; do
            if [ "$i" = "R" ]; then
                    echo "give read permition on $file"
                    chmod +r $file
            break
            elif [ "$i" = "W" ]; then
                    echo "give write permition on $file"
            chmod +w $file
                    break
            elif [ "$i" = "X" ]; then
                    echo "give execute permition on $file"
            chmod +x $file
                    break
            else
                    echo "Bad choice"
            fi
        done
       }

function edit {   # edit file
        nano $file
}

function backup {   # create backup for the file and add the date of the backup
        date=$(date '+%Y-%m-%d-%H_%M_%S')
        echo "Create backup of $file to $file-backup-$date"
        cp -p $file $file-backup-$date
}

function restore {
        # List of all backups of the files and display them on the menu
        echo "Please select a backup to restore:"
        options=( $(find . -maxdepth 1 -name "*$file-backup*" -print0 | xargs -0) )
        # create menu to permit to select file to restore
        PS3="$backup "
        select opt in "${options[@]}" "Quit" ; do
            if (( REPLY == 1 + ${#options[@]} )) ; then
                exit

            elif (( REPLY > 0 && REPLY <= ${#options[@]} )) ; then
                echo  "You choose $opt which is file $REPLY"
                break

            else
                echo "Bad selection"
            fi
        done
        # copy backup
        cp -v $opt $file
        echo "$opt restored on $file"

}
# Dislay size of the file
function displaysize {
        echo "Size of $file: "
        ls -s $file
}

function renamefile {
        echo "Choose a new name for $file"
 read newfile
        mv $file $newfile
}

 # Call function choosefile to select a file name


Choosefile
# Display Menu for the Program
PS3="Make a choice: (press enter to display menu) "

select item in "- Create the file" "- Delete the file" "- Edit the file" "- Create a backup " "- Restore a backup " "- display size " "- Add permition " "- Find file " "- Exit script " "- Change file"
do
    for var in $REPLY; do
        echo "Your choice: $var : $item"
        case $var in
                1)
                        # call createfile function
                        createfile
                        ;;
                2)
                        # call deletefile function
                        deletefile
                        ;;
                3)

                        edit
                        ;;
                4)

                        backup
                        ;;
                5)

                        restore
                        ;;
                6)

                        displaysize
                        ;;
                7)

                        addpermition
                        ;;
                8)

                        renamefile
                        ;;
                9)
                        echo "End of script"
                        exit 0
                        ;;
                10)
                        choosefile
                        ;;
                *)
                        echo "Incorrect selection"
                        ;;
        esac
    done
done