#!/usr/bin/env bash
# This script is intended to be run via cron. But you can run it manually as
# well

# It creates a folder structure in home for the current date in the following format:
# <Dir>/<Tag>/<Year>/<Month>/<Day>

# It also sets up a symlink for the tagged folder.
# This symlink will always point to the folder for the current date.

# Finally, it removes any folders without data, to prevent clutter.

set -e

function errorFn
{
  error=$?
  if [[ $error -gt 0 ]];
  then
    echo "$LD_BIN error ($error): "
    perl -E 'say $!=shift' $error
  fi
  exit $error
}

# Error handling
trap errorFn ERR

# Source LD
LD_INTERNAL=1
. $(dirname $(realpath $0))/ld.source

if [[ $1 == '' ]]; then
  echo "Usage: $LD_BIN <folder>"
  echo "Creates a folder within '.daisy' in the current directory containing"
  echo "a tree of dates associated with the folder name given by argument."
  echo "A symlink is (re-)created at the same time with the same folder name."
  echo "For example, if given the folder 'notes', this utility will:"
  echo "- Create a folder '/.daisy/notes/<year>/<month>/<day>'."
  echo "- Create a symlink named 'notes' that points to it."
  echo "It is recommended to run this via cron."
  exit 1
fi

view=0
view_date=0

if [[ "$1" == "--view" ]]; then
  # We are only going to view the agenda
  view_date=$2
  view=1
  shift 2
fi

dir=$(realpath -s "$1")
parent_dir=$(dirname "$dir")
name=$(basename "$dir")
root_dir="$parent_dir/.daisy/$name"
today_sym="$dir"

# Present day
read year month day < <(date "+%Y %m %d")
today="$root_dir/$year/$month/$day"

# First we clear out empty folders, and remove the symlink if it exists
if test -e "$root_dir"; then
  find "$root_dir" -name "More..." -delete
  find "$root_dir" -depth -maxdepth 3 -type d \
    -not -path "$today" \
    -exec sh -c '
    if [ $(ls -A "$1" | wc -l) -eq 0 ]; then
      rm -rf "$1"
    fi
    ' _ {} \;
fi

if [[ $view == 1 ]]; then
  # View mode
  [[ ! -d "$root_dir/$view_date" ]] && echo "This date entry does not exist." && exit 1
  view_date="$root_dir/$view_date"

  # 1. -name "*.squashfs" -prune: If a folder ends in .squashfs, don't descend into it.
  # 2. ! -name "*.squashfs": Inside the directory check, ignore squashfs files.
  # 3. --ignore="*.squashfs": Tells ls to hide those entries from the final list.
  find "$(realpath "$view_date")" -name "*.squashfs" -prune -o -type d -exec sh -c '
    find "$1" -maxdepth 1 -type f ! -name "*.squashfs" | read -r
  ' _ {} \; -exec ls --color=always -lah --ignore="*.squashfs" {} + 2>/dev/null
  exit 0
fi

# Now we can set up today's directory
mkdir -p "$today"
ln -snf "$today" "$today_sym"
ln -snf "$root_dir" "$dir/More..."
exitcode=$?