#!/bin/sh

# Copyright 2022 - 2024 Paul Hänsch
# 
# Permission to use, copy, modify, and/or distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
# 
# THE SOFTWARE IS PROVIDED “AS IS” AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
# SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
# IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

. "$_EXEC/cgilite/cgilite.sh"
. "$_EXEC/acl.sh"
. "$_EXEC/tools.sh"
. "$_EXEC/db23.sh"

tags='' ntags='' dir='' depth='' glob_system_pages=false
label='' labeltype='' altlabel='' titles='' db3_data=''
DB3 new  # Use DB3 for in-memory cache

set -- "$@" --
while [ $# -gt 0 ]; do case $1 in
  --system) glob_system_pages=true; shift 1;;
  --depth)  depth="$2"; shift 2;;
  --title|--titles) titles=true; shift 1;;
  \#*) tags="${tags}${tags:+ }${1###}"; shift 1;;
  \!*) ntags="${ntags}${ntags:+ }${1##!}"; shift 1;;
  --h1|--h2|--h3|--h4|--h5|--h6|--label)
    labeltype="${1#--}" label="$2"; shift 2;;
  --alt-label|--altlabel)
    altlabel="$2"; shift 2;;
  --) shift 1; break;;
  *) if [ ! "$dir" ]; then
      dir="$1"
      set -- "$@" "$1"; shift 1;
    elif [ ! "$depth" ]; then
      depth="$1"; shift 1;
    else
      set -- "$@" "$1"; shift 1;
    fi;;
esac; done

[ "$*" ] || set -- "*"
[ "$depth" -ge 0 -o "$depth" -le 0 ] 2>&- || depth=0

print_page() {
  # print page URL and resolve page title (for use with --title flag)
  # avoid calling this function via a subshell (i.e. $(print_page *))
  # because it should be able to write its cache variable
  local page="${1%/}/" title='' pfrag=''
  pfrag="${page}"

  # resolve name of each path element
  while [ "${pfrag%/*}" -a "${pfrag%/*}" != "${pfrag}" ]; do
    pfrag="${pfrag%/*}"
    title="$(DB3 get "${pfrag}" || ! page_title "$(page_abs "${pfrag}")")/${title}" && break
  done
  # keep resolved names in cache
  DB3 set "${page%/*}" "${title%/}"

  [ "${page#/}" != "${page}" ] && title="/$title"
  printf '%s	%s\n' "$(URL "$page")" "$(HTML "${title}")"
}

pagelist="$(
  for dir in "$@"; do
    page_glob "$dir" "$depth"
  done \
  | sort -u \
  | while read -r page; do
    pagedir="$(page_abs "$page")"
    if [ -f "$_DATA/pages/${pagedir}/#page.md" -o \
         -f "$_EXEC/pages/${pagedir}/#page.md" ] \
       && acl_read "$pagedir" \
       && has_tags "$pagedir" $tags \
       && ! has_tag "$pagedir" $ntags
    then
      # Be careful, not to fork the print_page function into a subshell
      # as it must be able to write its cache to the current context
      [ "$titles" ] \
      && print_page "$page" \
      || printf '%s	%s\n' "$(URL "$page")" "$(HTML "$page")"
    fi
  done
)"

if [ "$pagelist" ]; then
  [ "$label" ] \
  && printf '<%s class="macro pagelist label">%s</%s>' "$labeltype" "$(HTML "$label")" "$labeltype"

  printf '<ul class="macro pagelist">\n'
  printf %s\\n "$pagelist" \
  | sort -k2 \
  | while read -r url title; do
    printf '<li><a href="%s">%s</a></li>\n' "${url}" "${title}"
  done
  printf '</ul>\n'

elif [ "$altlabel" ]; then
  printf '<label class="macro pagelist altlabel">%s</label>' "$(HTML "$altlabel")"
fi