#!/bin/sh

version="v1.7.9"
configsystem="/etc/burrow/config"
if [ -n "$XDG_CONFIG_HOME" ]; then
  configfiles="${XDG_CONFIG_HOME}/burrow/config"
else
  configfiles="$HOME/.config/burrow/config $HOME/.config/burrow $HOME/.burrow"
fi

# vars from config
config_dir_gopher="$HOME/public_gopher/"
config_dir_phlog="phlog"
config_gopher_server="envs.net"
config_gopher_port="70"
config_gopher_root="/~$USER/"
config_phlog_gophermap=true
config_phlog_usedate=true
config_git_commit=false
config_git_push=false
config_autoindent=true
config_file_rss="rss.xml"
config_gopher_name="$USER's gopherhole"
config_gopher_desc="this is my gopherhole"
config_rss_num_entries="10"
config_phlog_autorss=false
config_gophermap_omitserver=false
config_gophernicus=true

# coreutils function wrappers
stat_func () {
  return 0
}

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

# vars from args
arg_options="hvd"
arg_shortlist=0
arg_gopherdir=0
arg_phlog=0
arg_quickstart=0
arg_edit_config=0
arg_update_git=0
arg_rss=0
arg_gophermap=""

# silence directory movements
push_d () {
  cd "$@" > /dev/null 2> /dev/null || exit
}

pop_d () {
  cd - > /dev/null 2> /dev/null || exit
}

show_help () {
  cat << END
burrow [options] [commands]

COMMANDS:
      phlog                   Create new phlog entry
      gophermap               Edit a gophermap
      rss                     Generate an rss feed of recent phlog entries
      quickstart              Create a new configuration file from prompts
      edit-config             Edit your configuration file
      update-git              Silently pulls gopher git repo if it exists

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

END
}

check_coreutils () {
  if stat -c"%U" /dev/null >/dev/null 2>/dev/null ; then
    # GNU environment
    stat_func () {
      stat -c %Y "$1"
    }
    date_func () {
      date -d "$1" +"%a, %d %b %Y %T %z" 2>/dev/null
    }
  else
    # BSD environment
    stat_func () {
      stat -Lnqr "$1" | awk '{print $10}'
    }
    date_func () {
      # $1 will be in YYYYMMDD format
      printf "%s" "$1" | awk 'BEGIN {n = split("Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec",month)} { y=substr($0, 0, 4); m=substr($0,5,2); gsub ("^0*", "", m); d=substr($0,7,2); print d, month[m], y, "00:00:00 +0000"}' 2>/dev/null
    }
  fi
}

parse_input () {
  if ! parsed=$(getopt $arg_options "$@"); then
    die "Invalid input" 2
  fi

  eval set -- "$parsed"

  while true; do
    case "$1" in
      -h)
        flag_help=1
        shift
        ;;
      -v)
        flag_version=1
        shift
        ;;
      -d)
        flag_debug=1
        shift
        ;;
      --)
        shift
        break
        ;;
      *)
        die "Internal error: $1" 3
        ;;
    esac
  done

  while test $# -gt 0
  do
    argc=$(printf "%s" "$1" | tr '[:upper:]' '[:lower:]')
    case $argc in
      "quickstart")
        arg_quickstart=1
        ;;
      "shortlist")
        arg_shortlist=1
        ;;
      "gophermap")
        if [ $# -gt 1 ]; then
          shift
          arg_gophermap="${1%/}/"
        else
          arg_gophermap="/"
        fi
        ;;
      "phlog")
        arg_phlog=1
        ;;
      "gopherdir")
        arg_gopherdir=1
        ;;
      "edit-config")
        arg_edit_config=1
        ;;
      "update-git")
        arg_update_git=1
        ;;
      "rss")
        arg_rss=1
        ;;
      *) printf "Unknown command: %s\\n" "$argc";;
    esac
    shift
  done
}

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

update_gopher_root () {
  touch "${config_dir_gopher}gophermap"
  newdate=$(date +"%B %d$(day_suffix), %Y")
  newString=$(printf "i     ==== Last Updated: %s ====\\t\\t%s\\t%s" \
    "$newdate" \
    "$config_gopher_server" \
    "$config_gopher_port")
  if [ "$(uname)" = "Darwin" ]; then
    sed -i '' "s|.*Last\\ Updated:.*|${newString}|" "${config_dir_gopher}gophermap"
  else
    sed -i'' "s|.*Last\\ Updated:.*|${newString}|" "${config_dir_gopher}gophermap"
  fi
}

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

die () {
  msg="$1"
  code="$2"

  # exit code defaults to 1
  if printf "%s" "$code" | grep -q '^[0-9]+$'; then
    code=1
  fi

  # output message to stdout or stderr based on code
  if [ -n "$msg" ]; then
    if [ "$code" -eq 0 ]; then
      printf "%s\\n" "$msg"
    else
      printf "%s\\n" "$msg" >&2
    fi
  fi
  exit "$code"
}

finish () {
  if [ -f "$temp_gophermap" ]; then
    rm "$temp_gophermap"
  fi
  if [ -f "$temp_post" ]; then
    rm "$temp_post"
  fi
}
trap finish EXIT

make_post_git () {
  if $config_git_commit; then
    push_d "$config_dir_gopher"
    git add "${post_dir}/gophermap" "${post_file}" "$type_gophermap"
    if $update_root; then
      git add "${config_dir_gopher}/gophermap"
    fi
    if $config_phlog_autorss; then
      git add "${config_dir_gopher}${config_file_rss}"
    fi
    git commit -m "$post_type: $title"
    if $config_git_push; then
      git pull
      git push
    fi
    pop_d
  fi
}

make_post_process_formatting () {
  # If using gophermap, prefix all post lines with "i" except links
  if $use_gophermap; then
    if $config_autoindent; then
      temp_post=$(mktemp -t "$(basename "$0").post.XXXXXXX") || \
        die "Failed to create temporary file" 1
      if $config_gophernicus; then
        awk -v server="${config_gopher_server}" -v port="${config_gopher_port}" '/(^[0-9cdghisGIT;\+].*\t|^[=\*\%\#\!\:\~\.].*)/ {print $0; next} {print "i" $0 "\t\t" server "\t" port}' "$post_file" > "${temp_post}"
      else
        awk -v server="${config_gopher_server}" -v port="${config_gopher_port}" '/^[0-9cdghisGIT;\+].*\t/ {print $0; next} {print "i" $0 "\t\t" server "\t" port}' "$post_file" > "${temp_post}"
      fi
      # create post file normally to respect umask
      touch "${post_file}"
      cat "${temp_post}" > "${post_file}"
      rm "${temp_post}"
    fi
  fi
}

make_post_gophermap () {
  # Create temporary gophermap for new post
  temp_gophermap=$(mktemp -t "$(basename "$0").gophermap.XXXXXXX") || \
    die "Failed to create temporary file" 1

  # Add appropriate link into temp gophermap
  if $use_gophermap; then
    if $use_date; then
      if $config_gophermap_omitserver; then
        # if using gophermap and date, no server
        printf "1%s - %s\\t%s\\n" \
          "$(date +%Y-%m-%d)" \
          "$title" \
          "$post_file_path" > "$temp_gophermap"
      else
        # if using gophermap and date
        printf "1%s - %s\\t%s\\t%s\\t%s\\n" \
          "$(date +%Y-%m-%d)" \
          "$title" \
          "$post_file_path" \
          "$config_gopher_server" \
          "$config_gopher_port" > "$temp_gophermap"
      fi
    else
      if $config_gophermap_omitserver; then
        # if using gophermap but not date, no server
        printf "1%s\\t%s\\n" \
          "$title" \
          "$post_file_path" > "$temp_gophermap"
      else
        # if using gophermap but not date
        printf "1%s\\t%s\\t%s\\t%s\\n" \
          "$title" \
          "$post_file_path" \
          "$config_gopher_server" \
          "$config_gopher_port" > "$temp_gophermap"
      fi
    fi
  else
    if $use_date; then
      if $config_gophermap_omitserver; then
        # if not using gophermap but using date, no server
        printf "0%s - %s\\t%s\\n" \
          "$(date +%Y-%m-%d)" \
          "$title" \
          "$post_file_path" > "$temp_gophermap"
      else
        # if not using gophermap but using date
        printf "0%s - %s\\t%s\\t%s\\t%s\\n" \
          "$(date +%Y-%m-%d)" \
          "$title" \
          "$post_file_path" \
          "$config_gopher_server" \
          "$config_gopher_port" > "$temp_gophermap"
      fi
    else
      if $config_gophermap_omitserver; then
        # if not using gophermap or date, no server
        printf "0%s\\t%s\\n" \
          "$title" \
          "$post_file_path" > "$temp_gophermap"
      else
        # if not using gophermap or date
        printf "0%s\\t%s\\t%s\\t%s\\n" \
          "$title" \
          "$post_file_path" \
          "$config_gopher_server" \
          "$config_gopher_port" > "$temp_gophermap"
      fi
    fi
  fi

  if [ -f "$type_gophermap" ]; then
    cat "$type_gophermap" >> "$temp_gophermap"
  fi

  if ! $use_date; then
    sort -fk 1.2 "$temp_gophermap" -o "$temp_gophermap"
  fi
  touch "$type_gophermap"
  cat "$temp_gophermap" > "$type_gophermap"
  rm "$temp_gophermap"

  # Sort gophermap alphabetically if not using date
  if [ "$use_gophermap" ] && [ ! "$use_date" ]; then
    sort -fo "$type_gophermap" "$type_gophermap"
  fi
}

make_post_unprocess () {
  if [ $config_autoindent ]; then
    temp_post=$(mktemp -t "$(basename "$0").post.XXXXXXX") || \
      die "Failed to create temporary file" 1

    # If using gophermaps, unformat it for editing
    if $use_gophermap; then
      awk -F"\\t" '/^[0-9h\+GIThs].*\t/ {print $0; next} {sub(/^i/, "", $1);print $1}' "$post_file" > "${temp_post}"
    else
      # copy existing post to tempfile
      cp "$post_file" "${temp_post}"
    fi

  fi

  # Get timestamp of tempfile
  temp_post_time=$(stat_func "$temp_post")

  # Edit tempfile
  ${EDITOR:-vim} "$temp_post"

  # Verify that timestamp changed after editing, or abort
  temp_post_time_check=$(stat_func "$temp_post")
  if [ "$temp_post_time" -ne "$temp_post_time_check" ] ; then
    touch "${post_file}"
    cat "${temp_post}" > "${post_file}"
    rm "${temp_post}"
  else
    rm "${temp_post}"
    return 1
  fi
}

make_post_temp () {
  # Create a tempfile to do our work
  temp_post=$(mktemp -t "$(basename "$0").post.XXXXXXX") || \
    die "Failed to create temporary file" 1

  if [ -n "$title" ]; then
    { printf "%s\\n%s\\n" "----------------------------------------" "$title"
      if $use_date; then
        date +"%B %d$(day_suffix), %Y"
      fi
      printf "%s\\n\\n\\n" "----------------------------------------"
    } > "$temp_post"
  else
    { printf "%s\\n%s\\n" "----------------------------------------" "$post_type"
      printf "%s\\n\\n\\n" "----------------------------------------"
    } > "$temp_post"
  fi

  # Check timestamp before editing file
  temp_post_time=$(stat_func "$temp_post")
  ${EDITOR:-vim} "$temp_post"

  # Verify that timestamp changed after editing, or abort
  temp_post_time_check=$(stat_func "$temp_post")

  # If we saved a change, create the new file
  if [ "$temp_post_time" -ne "$temp_post_time_check" ] ; then
    mkdir -p "${post_dir}"
    touch "${post_file}"
    cat "${temp_post}" > "${post_file}"
    rm "${temp_post}"
  else
    rm "${temp_post}"
    return 1
  fi
}

make_post_paths () {
  type_gophermap="${config_dir_gopher}${post_type}/gophermap"

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

make_post () {
  query="$1"
  post_type="$2"
  use_gophermap="$3"
  use_date="$4"
  update_root="$5"
  create_rss="$6"
  create_gophermap="$7"

  check_directory "$config_dir_gopher"

  if [ ! -d "${config_dir_gopher}${post_type}" ]; then
    mkdir -p "${config_dir_gopher}${post_type}"
  fi

  if [ -n "$query" ]; then
    printf "%s" "$query"
    read -r title
    if [ -z "$title" ]; then
      die "Cancelled." 0
    fi
  else
    title=""
  fi

  make_post_paths

  if [ -f "$post_file" ]; then
    make_post_unprocess
    if [ "$?" -eq 1 ]; then
      die "Aborted edit" 0
    fi
    make_post_process_formatting
  else
    make_post_temp
    if [ "$?" -eq 1 ]; then
      die "Aborted post" 0
    fi
    make_post_process_formatting
    if $create_gophermap; then
      make_post_gophermap
    fi
  fi

  if $update_root; then
    update_gopher_root
  fi

  if $create_rss; then
    make_rss
  fi

  make_post_git
}

make_rss () {
  push_d "${config_dir_gopher}${config_dir_phlog}"
  search_list=$(find . \
    -mindepth 1 \
    -type f \
    -print | \
      grep -v "^\\./gophermap$" |
      sort -r | \
      head -n "${config_rss_num_entries}")

  {
    printf '<?xml version="1.0"?><rss version="2.0"><channel>'
    printf "\\n<title>%s</title>\\n" "$config_gopher_name"
    printf "<link>gopher://%s%s</link>\\n" "$config_gopher_server" "$config_gopher_root"
    printf "<description>%s</description>\\n" "$config_gopher_desc"
  }  > "${config_dir_gopher}${config_file_rss}"

  for f in $search_list; do
    filename="$(printf "%s" "$f" | sed "s|${config_dir_gopher}${config_dir_phlog}/||" | sed "s|^\\./||")"
    if printf "%s" "$filename" | grep -q "/gophermap"; then
      item_type=1
      filename="$( printf "%s" "$filename" | sed "s|gophermap$||")"
    else
      item_type=0
    fi
    date="$(printf "%s" "$filename" | sed 's|^\./||' | awk 'BEGIN { FS="-" } { print $1; }')"
    title="$(printf "%s" "$filename" | awk 'BEGIN { FS="-" } { $1=""; print $0; }' | sed "s|/gophermap||" | sed 's/^\ //' | sed 's|/$||' | awk '{for(i=1;i<=NF;i++){ $i=toupper(substr($i,1,1)) substr($i,2) }}1')"
    dateval=$(date_func "$date")
    if [ -n "$dateval" ]; then
      {
        printf "<item>\\n"
        printf "  <title>%s</title>\\n" "$title"
        printf "  <link>gopher://%s/%s%s%s/%s</link>\\n" "$config_gopher_server" "$item_type" "$config_gopher_root" "$config_dir_phlog" "$filename"
        printf "  <pubdate>%s</pubdate>\\n" "$dateval"
        printf "  <description><![CDATA[<pre>\\n"
        if [ "$item_type" -eq 1 ]
        then
          awk -v server="${config_gopher_server}" -v port="${config_gopher_port}" -F"\\t" '/^[2-9\+GITs].*\t/ {print $0; next} /^h.*\t/ { l=substr($1, 2, length($1)); print l "\n    " substr($2, 5, length($2)); next } /^[0-1].*\t/ { l=substr($1, 2, length($1)); t=substr($1,1,1); (!$3) ? s=server : s=$3; print l "\n    gopher://" s  "/" t $2; next } {sub(/^i/, "", $1);print $1}' "$f"
        else
          cat "$f"
        fi
        printf "</pre>]]></description>\\n"
        printf "</item>\\n"
      } >> "${config_dir_gopher}${config_file_rss}"
    fi
  done
  pop_d
  printf "</channel>\\n" >> "${config_dir_gopher}${config_file_rss}"
  printf "</rss>\\n" >> "${config_dir_gopher}${config_file_rss}"
}

edit_config () {
  for configfile in $configfiles; do
    if [ -f "$configfile" ] && [ -w "$configfile" ]; then
      ${EDITOR:-vim} "$configfile"
    fi
  done
}

yesno () {
  printf "%s " "$1"
  read -r yn
  case $yn in
    [Yy]* ) result=0 ;;
    * ) result=1 ;;
  esac
  return $result
}

quickstart () {
  printf "Location of your local gopher directory? "
  read -r config_dir_gopher
  # add trailing slash if missing
  config_dir_gopher="${config_dir_gopher%/}/"
  printf "Hostname of your gopher server? "
  read -r config_gopher_server
  printf "Port of your gopher server? "
  read -r config_gopher_port
  printf "Root directory of your gopher site? "
  read -r config_gopher_root
  if yesno "Is your gopher server 'gophernicus'? "; then
    config_gophernicus=true
  else
    config_gophernicus=false
  fi
  # add trailing slash if missing
  config_gopher_root="${config_gopher_root%/}/"
  if yesno "Create a phlog? "; then
    printf "Phlog directory? (relative to root of gopher site) "
    read -r config_dir_phlog
    # remove leading slash if present
    config_dir_phlog="${config_dir_phlog#/}"
    if yesno "Include gophermap? "; then
      config_phlog_gophermap=true
    else
      config_phlog_gophermap=false
    fi
    if yesno "Include the date in your phlog posts? "; then
      config_phlog_usedate=true
    else
      config_phlog_usedate=false
    fi
    if yesno "Auto-commit to git repo? "; then
      config_git_commit=true
    else
      config_git_commit=false
    fi
    if yesno "Auto-push to git remote? "; then
      config_git_push=true
    else
      config_git_push=false
    fi
    if yesno "Auto-indent posts? "; then
      config_autoindent=true
    else
      config_autoindent=false
    fi
    if yesno "Auto-generate phlog RSS? "; then
      config_phlog_autorss=true
      printf "Name of gopher hole? "
      read -r config_gopher_name
      printf "Description of gopher hole? "
      read -r config_gopher_desc
      printf "RSS filename? "
      read -r config_file_rss
      printf "Number of RSS entries? "
      read -r config_rss_num_entries
    else
      config_phlog_autorss=false
    fi
  fi
}

create_config () {
  match=0
  for configfile in $configfiles; do
    if [ -f "$configfile" ]; then
      match=1
    fi
  done
  if [ $match -eq 0 ]; then
    if [ -n "$XDG_CONFIG_HOME" ]; then
      config="$XDC_CONFIG_HOME/burrow/config"
    else
      config="$HOME/.config/burrow/config"
    fi
    mkdir -p "$(dirname "$config")"
    {
      printf "config_dir_gopher=\"%s\"\\n" "$config_dir_gopher"
      printf "\\n"
      printf "config_gopher_server=\"%s\"\\n" "$config_gopher_server"
      printf "config_gopher_port=\"%s\"\\n" "$config_gopher_port"
      printf "config_gopher_root=\"%s\"\\n" "$config_gopher_root"
      printf "\\n"
      printf "config_dir_phlog=\"%s\"\\n" "$config_dir_phlog"
      printf "config_phlog_gophermap=%s\\n" "$config_phlog_gophermap"
      printf "config_phlog_usedate=%s\\n" "$config_phlog_usedate"
      printf "config_phlog_autorss=%s\\n" "$config_phlog_autorss"
      printf "\\n"
      printf "config_git_commit=%s\\n" "$config_git_commit"
      printf "config_git_push=%s\\n" "$config_git_push"
      printf "\\n"
      printf "config_autoindent=%s\\n" "$config_autoindent"
      printf "config_gophernicus=%s\\n" "$config_gophernicus"
      printf "\\n"
      printf "config_file_rss=\"%s\"\\n" "$config_file_rss"
      printf "config_gopher_name=\"%s\"\\n" "$config_gopher_name"
      printf "config_gopher_desc=\"%s\"\\n" "$config_gopher_desc"
      printf "config_rss_num_entries=\"%s\"\\n" "$config_rss_num_entries"
    } >> "$config"
  fi
}

update_git () {
  push_d "$config_dir_gopher"
  if [ "$(git rev-parse --is-inside-work-tree 2> /dev/null)" ]; then
    git pull -q > /dev/null 2> /dev/null
  fi
  pop_d
}

main () {
  check_coreutils "$@"
  parse_input "$@"

  if [ $arg_shortlist -gt 0 ]; then
    out="phlog gophermap rss edit-config update-git"
    die "${out}" 0
  fi

  if [ $flag_version -gt 0 ]; then
    printf "%s\\n" "$version"
  fi

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

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

  if [ $arg_quickstart -gt 0 ]; then
    quickstart
    create_config
  fi

  if [ $arg_edit_config -gt 0 ]; then
    create_config
    edit_config
  fi

  # load system config first
  if [ -f "$configsystem" ]; then
    # shellcheck disable=SC1090
    . "$configsystem"
  fi

  # load any user configuration files in order
  for configfile in $configfiles; do
    if [ -f "$configfile" ]; then
      # shellcheck disable=SC1090
      . "$configfile"
    fi
  done

  if [ $arg_gopherdir -gt 0 ]; then
    die "${config_dir_gopher}" 0
  fi

  if [ $arg_update_git -gt 0 ]; then
    update_git
  fi

  if [ "$arg_gophermap" != "" ]; then
    make_post "" \
       "${arg_gophermap}" \
       true \
       false \
       true \
       false \
       false
  fi

  if [ $arg_phlog -gt 0 ]; then
    make_post "Enter a title for your post: " \
      "$config_dir_phlog" \
      "$config_phlog_gophermap" \
      "$config_phlog_usedate" \
      true \
      ${config_phlog_autorss} \
      true
  fi

  if [ $arg_rss -gt 0 ]; then
    make_rss
  fi
}

main "$@"