#!/usr/bin/env bash

version="v1.2.0"

shopt -s extglob
configfiles="$HOME/.config/burrow/config $HOME/.config/burrow $HOME/.burrow"
editor=${EDITOR:-vi}

# vars from config
config_dir_gopher="$HOME/gopher/"
config_dir_recipebox="recipebox"
config_dir_phlog="phlog"
config_dir_topics="topics"
config_gopher_server="sdf.org"
config_gopher_port="70"
config_gopher_root="/users/username/"
config_git_commit=false
config_git_push=false
config_autoindent=true

# vars from flags
flag_debug=0
flag_version=0
flag_help=0
flag_noautoindent=0

# vars from args
arg_options=hvd
arg_longoptions=help,version,debug,noautoindent
arg_shortlist=0
arg_recipe=0
arg_phlog=0
arg_topic=0
arg_create_config=0
arg_update_git=0

# silence directory movements
pushd () {
  command pushd "$@" 2>/dev/null 1>&2
}

popd () {
  command popd 2>/dev/null 1>&2
}

function show_help() {
  cat > /dev/stdout << END
burrow [options] [commands]

COMMANDS:
      phlog                   Create new phlog entry
      recipe                  Add new recipe to box
      topic                   Add or update a topic
      create-config           Create a default configuration file
      update-git              Silently pulls gopher git repo if it exists

OPTIONAL FLAGS:
  -h, --help                  Show this help
  -v, --version               Show current version info
  -d, --debug                 Debug mode

END
}

function parse_input() {
  parsed=$(getopt --options=$arg_options --longoptions=$arg_longoptions --name "$0" -- "$@")
  if [[ $? -ne 0 ]]; then
    exit 2
  fi

  eval set -- "$parsed"

  while true; do
    case "$1" in
      -h|--help)
        flag_help=1
        shift
        ;;
      -v|--version)
        flag_version=1
        shift
        ;;
      -d|--debug)
        flag_debug=1
        shift
        ;;
      --noautoindent)
        flag_noautoindent=1
        shift
        ;;
      --)
        shift
        break
        ;;
      *)
        echo "Internal error: $1"
        exit 3
        ;;
    esac
  done

  for arg in "$@"
  do
    argc=${arg,,}
    case $argc in
      "shortlist") arg_shortlist=1 ;;
      "phlog") arg_phlog=1 ;;
      "recipe") arg_recipe=1 ;;
      "topic") arg_topic=1 ;;
      "create-config") arg_create_config=1 ;;
      "update-git") arg_update_git=1 ;;
      *) echo "Unknown command: $arg";;
    esac
  done
}

function day_suffix() {
  case $(date +%d) in
    01|1|21|31) echo "st";;
    02|2|22)    echo "nd";;
    03|3|23)    echo "rd";;
    *)          echo "th";;
  esac
}

function update_gopher_date() {
  echo "Updating gopher last modified date"
  sed -i "s/.*Last\ Updated:.*/        ==== Last Updated: $(date +"%B %d$(day_suffix), %Y") ====/" "${config_dir_gopher}/gophermap"
}

function check_directory() {
  if [[ ! -d "$1" ]]
  then
    echo "Missing directory: $1 aborting."
    exit 1
  fi
}

function finish {
  if [[ -f "$temp_gophermap" ]]; then
    rm "$temp_gophermap"
  fi
  if [[ -f "$temp_links" ]]; then
    rm "$temp_links"
  fi
}
trap finish EXIT

function make_post() {
  query="$1"
  type="$2"
  use_gophermap="$3"
  use_date="$4"
  update_root="$5"

  read -r -e -p "$query" title
  if [[ $title == "" ]]
  then
    echo "Cancelled."
    exit 0
  fi

  type_gophermap="${config_dir_gopher}${type}/gophermap"

  if $use_gophermap; then
    title_slug=$(echo "${title}" | sed -E -e 's/[^[:alnum:]]/-/g' -e 's/^-+|-+$//g' | tr -s '-' | tr '[:upper:]' '[:lower:]')
    if $use_date; then
      post_dir="${config_dir_gopher}${type}/$(date +%Y%m%d)-$title_slug"
      post_path="${config_gopher_root}${type}/$(date +%Y%m%d)-$title_slug"
    else
      post_dir="${config_dir_gopher}${type}/$title_slug"
      post_path="${config_gopher_root}${type}/$title_slug"
    fi
    post_file="${post_dir}/gophermap"
    post_file_path="${post_path}"
  else
    post_dir="${config_dir_gopher}${type}"
    post_path="${config_gopher_root}${type}"
    title_slug=$(echo "${title}" | sed -E -e 's/[^[:alnum:]]/-/g' -e 's/^-+|-+$//g' | tr -s '-' | tr '[:upper:]' '[:lower:]')
    if $use_date; then
      title_slug="$(date +%Y%m%d)-${title_slug}"
    fi
    post_file="${post_dir}/${title_slug}.txt"
    post_file_path="${post_path}/${title_slug}.txt"
  fi

  if [[ -f $post_file ]]
  then
    $editor "$post_file"
  else
    mkdir -p "${post_dir}"
    if [[ -f "${post_dir}/.template" ]]
    then
      cat "${post_dir}/.template" > "$post_file"
    else
      echo "Creating $post_file"
      {
        echo "----------------------------------------"
        echo "$title"
        if $use_date; then
          date +"%B %d$(day_suffix), %Y"
        fi
        echo "----------------------------------------"
        echo ""
        echo ""
        if $use_gophermap; then
          echo "Links:"
          echo ""
        fi
      } >> "$post_file"
    fi

    $editor "$post_file"

    if $use_gophermap; then
      if [[ $config_autoindent == true ]] && [[ $flag_noautoindent == 0 ]]
      then
        echo "Processing for links and autoindenting"
        temp_links=$(mktemp -t "$(basename "$0").links.XXXXXXX") || exit 1
        sed -n '/^Links:$/,$p' "$post_file" | tail -n +2 > "$temp_links"
        sed -i '/^Links:$/,$d' "$post_file"
        sed -i 's/^/ /' "$post_file"
        cat "$temp_links" >> "$post_file"
        rm "$temp_links"
      fi
    fi

    echo "Updating $type"
    temp_gophermap=$(mktemp -t "$(basename "$0").gophermap.XXXXXXX") || exit 1

    if $use_gophermap; then
      if $use_date; then
        # if using gophermap and date
        echo -e "1$(date +%Y-%m-%d) - $title\t${post_file_path}\t${config_gopher_server}\t${config_gopher_port}" > "$temp_gophermap"
      else
        # if using gophermap but not date
        echo -e "1$title\t${post_file_path}\t${config_gopher_server}\t${config_gopher_port}" > "$temp_gophermap"
      fi
    else
      if $use_date; then
        # if not using gophermap but using date
        echo -e "0$(date +%Y-%m-%d) - $title\t${post_file_path}\t${config_gopher_server}\t${config_gopher_port}" > "$temp_gophermap"
      else
        # if not using gophermap or date
        echo -e "0$title\t${post_file_path}\t${config_gopher_server}\t${config_gopher_port}" > "$temp_gophermap"
      fi
    fi

    cat "$type_gophermap" >> "$temp_gophermap"
    cat "$temp_gophermap" > "$type_gophermap"
    rm "$temp_gophermap"

    # sort gophermap if not using date
    if ! $use_date; then
      sort -fo "${post_dir}/gophermap" "${post_dir}/gophermap"
    fi

    if $update_root; then
      update_gopher_date
    fi

    if [[ $config_git_commit != false ]]
    then
      echo "Committing to git repository"
      pushd "$config_dir_gopher"
      git add "${post_dir}/gophermap" "${post_file}"
      if $update_root; then
        git add "${config_dir_gopher}/gophermap"
      fi
      git commit -m "$type: $title"
      if [[ $config_git_push != false ]]
      then
        echo "Pushing to git remote"
        git pull
        git push
      fi
      popd
    fi
  fi
}

function topic_new() {
  make_post "What topic? " "$config_dir_topics" true false true
}

function recipe_new() {
  make_post "What is the name of your recipe? " "$config_dir_recipebox" false false true
}

function phlog_new() {
  make_post "Enter a title for your post: " "$config_dir_phlog" true true true
}

function create_config() {
  if [[ ! -f "$HOME/.config/burrow/config" ]] &&
    [[ ! -f "$HOME/.config/burrow" ]] &&
    [[ ! -f "$HOME/.burrow" ]]
  then
    config="$HOME/.config/burrow/config"
    mkdir -p "$(dirname "$config")"
    {
      echo "config_dir_gopher=\"$HOME/gopher/\""
      echo "config_dir_phlog=\"phlog\""
      echo "config_dir_recipebox=\"recipebox\""
      echo "config_dir_topics=\"topics\""
      echo "config_gopher_server=\"sdf.org\""
      echo "config_gopher_port=\"70\""
      echo "config_gopher_root=\"/users/username/\""
      echo "config_git_commit=false"
      echo "config_git_push=false"
      echo "config_autoindent=true"
    } >> "$config"
  else
    echo "Configuration already exists. Abort."
  fi
}

function update_git() {
  pushd "$config_dir_gopher"
  if [[ $? -eq 0 ]] 
  then
    if [[ $(git rev-parse --is-inside-work-tree 2> /dev/null) ]]
    then
      git pull -q
    fi
    popd
  fi
}

function main() {
  parse_input "$@"

  if [[ $arg_shortlist -gt 0 ]]
  then
    echo "phlog topic recipe create-config update-git -v -h -d --version --help --debug --noautoindent"
    exit 0
  fi

  if [[ $flag_version -gt 0 ]]
  then
    echo "$version"
  fi

  if [[ $flag_help -gt 0 ]]
  then
    show_help
  fi

  if [[ $flag_debug -gt 0 ]]
  then
    set -x
  fi

  if [[ $arg_create_config -gt 0 ]]
  then
    create_config
  fi

  for configfile in $configfiles
  do
    if [[ -f $configfile ]]
    then
      source "$configfile"
    fi
  done

  if [[ ${arg_update_git} -gt 0 ]]
  then
    update_git
  fi

  if [[ ${arg_recipe} -gt 0 ]]
  then
    check_directory "$config_dir_gopher"
    check_directory "${config_dir_gopher}${config_dir_recipebox}"
    recipe_new
  fi

  if [[ ${arg_topic} -gt 0 ]]
  then
    check_directory "$config_dir_gopher"
    check_directory "${config_dir_gopher}${config_dir_topics}"
    topic_new
  fi

  if [[ ${arg_phlog} -gt 0 ]]
  then
    check_directory "$config_dir_gopher"
    check_directory "${config_dir_gopher}${config_dir_phlog}"
    phlog_new
  fi
}

main "$@"