#!/bin/bash

# Copyright (c) 2006, 2009 Peter Palfrader <peter@palfrader.org>
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

set -e

TODAY="$(date '+%F')"
BASE="$HOME/.temp"
TARGET="$HOME/tmp"


rmdir "$BASE/"*"/downloads" 2> /dev/null || true
rmdir "$BASE/"* 2> /dev/null || true

mkdir -p "$BASE/$TODAY"
[ -d "$BASE/$TODAY/downloads" ] || install -d -m 2770 -g ww-download "$BASE/$TODAY/downloads"
if ! [ -L "$TARGET" ] && [ -e "$TARGET" ]; then
	echo "$0: '$TARGET' already exists and is not a symlink." >&2
	exit 1;
fi

target_dir="$(dirname "$TARGET")"
if [ "${BASE##$target_dir/}" != "$BASE" ]; then
	BASE="${BASE##$target_dir/}"
fi
OLD="$(readlink -f "$TARGET")"

rm -f "$TARGET"
ln -s "$BASE/$TODAY" "$TARGET"

if [ -e "$OLD" ]; then
	bn="$(basename "$OLD")"
	if [ "$BASE/$bn" = "$OLD" ]; then
		OLD="$bn"
	fi
	ln -s -T -f "$OLD" "$BASE/yesterday"
fi