# Simple Note System
#    Copyright (C) 2016, Jon Lewis
#
#    This program is free software; you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation; either version 2 of the License, or
#    (at your option) any later version.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License along
#    with this program; if not, write to the Free Software Foundation, Inc.,
#    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
function create(){
    # Depends : p_header
    # Requires: $NOTE, $NOTE_DIR,
    # Optional: $ENCRYPTION, $SESSION_ID, $TMP_DIR encrypt
    # Given a valid setup, create writes the standard note header as specified
    # by p_header, to $NOTE.
    declare -r FILE="$NOTES_DIR/$NOTE.$EXT"
    # Refuse to overwrite a note
     if [ -e "$FILE" ]; then
        >&2 printf "$RED_COLOR!$RESET_COLOR %s\n\t%s\n"\
          "Note already exists"\
          "Hint: use -e to edit the note."
         exit 200
    fi

    # If the note's notebook/section does not exist,
    # create the appropriate folders.
    mkdir -p "$NOTES_DIR"/"$(dirname "$FILE")"

    # Write the standard note header
     if [ "$ENCRYPTION" == "TRUE" ]; then
        TMP_NOTE="$TMP_DIR"/"$SESSION_ID"
        p_header > "$TMP_NOTE"
        encrypt
     else
        p_header > "$FILE"
     fi
    # Make sure the note exists, and inform the user of the result.
     if [ -e "$FILE" ]; then
        printf "%s\n" "- Created note: ${NOTE%.*}"
     else
        >&2 printf "$RED_COLOR!$RESET_COLOR %s\n"\
         "Something went wrong, and the note was not created."
     fi
}
function delete(){
    # Requires: $NOTE, $NOTE_DIR
    # Given a valid $NOTE, delete removes $NOTE from sns.
    declare -r FILE="$NOTES_DIR/$NOTE.$EXT"

     if [ -e "$FILE" ]; then
        printf "$RED_COLOR!!$RESET_COLOR %s%s" "Delete " "${NOTE%.*}"
        read -p " (y/N) " YN
        case "$YN" in
            Y|y)
                rm "$FILE"
                printf "%s\n" "- Deleted note: ${NOTE%.*}."
                ;;
            *)
                printf "%s\n" "Aborted."
                ;;
        esac
        #Cleanup empty notebooks/sections]
        #find "$NOTES_DIR" -mindepth 1 -type d  | tac |\
        # while read -r DIR ; do
        #    if [ ! "$(ls -A "$DIR")" ]; then
        #        rmdir "$DIR"
        #    fi
        #done
     else
        >&2 printf "$RED_COLOR!$RESET_COLOR %s\n" "Note ${NOTE%.*} does not exist."
     fi
}
function edit(){
# Requires: $EDITOR, $NOTE
# Optional: $ENCRYPTION, $TMP_DIR, $SESSION_ID, decrypt, encrypt
# Set filename
declare -r FILE="$NOTES_DIR/$NOTE.$EXT"

# Verify an editor was specified
if [ -z "$EDITOR" ]; then
    >&2 printf "$RED_COLOR!$RESET_COLOR %s\n"\
     "No editor specified in environment."
    exit
# Verify the note exists
elif [ ! -r "$FILE" ]; then
    >&2 printf "$RED_COLOR!$RESET_COLOR %s\n"\
     "Note cannot be opened for editing."
    exit 40;
fi

# If encryption is enabled, decrypt $NOTE to a temp file, otherwise
# operate on the note directly.
if [ "$ENCRYPTION" == "TRUE" ]; then
    cp "$FILE" "$FILE.bk" #Insurance
    TMP_NOTE="$TMP_DIR/$SESSION_ID"
    decrypt > "$TMP_NOTE"
else
    TMP_NOTE="$FILE";
fi

# Write an ammendment header
if [ -z "$CREATE" ]; then
    printf "\n%s\n" "edit - $(date "$DATE_FMT")" >> "$TMP_NOTE"
    printf "%s\n" "===================================" >> "$TMP_NOTE"
fi

# Call the editor
printf "%s\n" "- editing ${NOTE%.*}"
"$EDITOR" "$TMP_NOTE"

# If the file was previously decrypted, encrypt it back
if [ "$ENCRYPTION" == "TRUE" ]; then
    printf "%s\n" "- encrypting ${NOTE%.*}"
    rm "$FILE"
    encrypt;
    rm "$TMP_NOTE"
    if [ ! -r "$FILE" ]; then
        >&2 printf "$RED_COLOR!$RESET_COLOR %s\n" "error: note was not saved."
        cp "$FILE.bk" "$FILE"
    else
        rm "$FILE.bk";
    fi
fi

# If $VCTL is defined, add the edited note to the repo.
if [ "$VCTL" ]; then
    >&2 printf "%s %s %s\n" "- adding to" "$VCTL" "repo".
    verctl "$VCTL" add "$FILE"
    verctl "$VCTL" commit -m "Added/Changed $NOTE" > /dev/null
fi
}
function help {
    printf "\n%s" "usage: sns [-cedlp] <notebook/section/name>"
    if [ -z "$VCTL" ]; then
        printf "\n%s%s%s" "usage: sns " "$VCTL" " ..."
    fi
    printf "\n%s" "       sns [-hi]"

    printf "\n%s" "  -c | --create : Create note"
    printf "\n%s" "  -C | --config : Edit Config"
    printf "\n%s" "  -d | --delete : Delete note"
    printf "\n%s" "  -e | --edit   : Open note for editing"
    printf "\n%s" "  -h | --help   : Display this message"
    printf "\n%s" "  -i | --init   : Write default config and initalize SNS store"
    printf "\n%s" "  -l | --list   : List all notes in NOTEBOOK"
    printf "\n%s" "  -p | --print  : Print note to console"
    printf "\n\n"
}
function list(){
    # This function, given a folder, $NOTE, will list the contents of $NOTE.
    # If not given a folder, it will list all notes in the store.

    if [ ! "$NOTEBOOK" ]; then NOTEBOOK="."; fi
    cd "$NOTES_DIR" 2>/dev/null || exit 0
    find "$NOTEBOOK" -type f -name "*$EXT" 2>/dev/null || exit 0 | while read file; do
        printf "%s\n" "${file%.*}"
    done


}
function p_header(){
    printf "# %s\n## %s\n" "$(basename "${NOTE%.*}")" "$(date "$DATE_FMT")"
}
function print(){
# Given an existing file, $NOTE, print prints the contents of $NOTE to stdout.

if [ -r "$NOTE" ]; then
    if [ "$ENCRYPTION" == "TRUE" ]; then decrypt #to stdout
    else cat "$NOTE"; fi
else
    >&2 printf "$RED_COLOR!$RESET_COLOR %s\n\t%s\n"\
     "Note cannot be found."
    exit 205 #ERR_NOTE_NO_READ
fi
}