#!/bin/bash
set -e


_help() {
    self=$( readlink -f "$0" )
    grep "  # " "$self" | grep -v [\)]
    exit
  # Moves files to subfolders YYYY-MM-DD/
  # Give filenames as arguments e.x.: *
  #
}


function gen_unique() {
    if [[ ! -e "$1" ]]; then
        echo "$1"
        return
    fi
    pathdir=$( dirname "$1" )
    fullname="${1##*/}"
    extension="${fullname##*.}"
    filename="${fullname%.*}"
    aZ=( {a..z} {A..Z} )
    idx=0
    while true; do
        newname="${filename}.${aZ[$idx]}.${extension}"
        idx=$(( idx + 1 ))
        if [[ ! -e "$pathdir/$newname" ]]; then
            echo "$pathdir/$newname"
            return
        fi
        if [[ -z "${aZ[$idx]}" ]]; then
          echo "Cannot find unique filename for: $1" >&2
          exit 1
        fi
    done
}


function move_to_dir() {
    pathdir=$( dirname "$1" )
    fullname="${1##*/}"
    date=$( find "$1" -printf '%TY-%Tm-%Td' )
    #date '+%Y-%m-%d' -d "$( date '+%Y/%m/%d %H:%M:%S' -r "$1" ) + 4" )
    mkdir -p "$pathdir/$date"
    tgt_name=$( gen_unique "$pathdir/$date/$fullname" )
    mv -vi "$1" "$tgt_name"
}


if [[ -z "$1" ]]; then
    _help
fi

for arg in "$@"; do
case "$arg" in
    --debug)
        #  --debug turn on set -x
        set -x
        ;;
    --help)
        #  --help This help message
        _help
        ;;
    -h)  # This help message
        _help
        ;;
esac
done

shopt -s nullglob

for file in "$@"; do
    if [[ "$file" = "-"* ]]; then
        continue
    fi
    if [[ -d "$file" ]]; then
        continue
    fi
    if [[ "$file" = "*" ]]; then
        continue
    fi
    move_to_dir "$file"
done