#!/bin/sh

# Copyright 2022 - 2023 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/tools.sh"
. "$_EXEC/acl.sh"

_(){ printf %s\\n "$*"; }
[ "${LANGUAGE}" -a -r "${_EXEC}/l10n/${LANGUAGE}.sh" ] && . "${_EXEC}/l10n/${LANGUAGE}.sh"

LIST=true DIFF=
while [ $# -gt 0 ]; do case $1 in
  --list)
    LIST=true
    shift 1
    ;;
  --no-list)
    LIST=
    shift 1
    ;;
  --diff)
    DIFF=true
    shift 1
    ;;
  --no-diff)
    DIFF=
    shift 1
    ;;
  *)page="$1"
    shift 1
    ;;
esac; done

page_abs="$(page_abs "$page")"
page_default="${page_abs%:*/}" 

if ! acl_read "$page_abs"; then
  return 0
fi

printf '<div class="macro revisions">\n'

if [ "$REV_PAGES" != true ]; then
  printf '<div class="error">%s</div>' "$(_ GIT is not available to handle revisioning.)"
  exit 1
fi

if [ "$LIST" = true ]; then
  printf '<ul>\n'
  IFS="	"
  { git -C "$_DATA" log --date=format:"%a, %x %H:%M" \
                      --pretty=format:"%h	%cd	%s" \
                      -- "pages${page_abs}#page.md"
    printf '\n'
  } | while read -r hash date message; do
    user="${message% @*}"; user="${user##*@ }"
    printf '<li><span class="hash"><a href="%s">%s</a></span><span class="date">%s</span><span class="user">%s</span></li>\n' \
      "$(HTML "${page%/}/[revision]/$hash")" "$(HTML "$hash")" "$(HTML "$date")" "$(HTML "$user")"
  done
  printf '</ul>\n'
fi

if [ "$DIFF" = true -a "$LANGUAGE_DEFAULT" -a "$page_default" != "$page_abs" ]; then
  commit="$(git -C "$_DATA" log --pretty=format:%H -- "pages${page_abs}#page.md" |head -n1)"
  printf '<section class="diff"><h2>%s</h2>' "$(_ 'Latest changes to the original language page')"
  git -C "$_DATA" diff -U3 "$commit" -- "pages${page_default}#page.md" |tail -n+5 \
  | while read -r diff; do case $diff in
    @@\ *\ @@*)
        line="${diff#@@ * @@}"
        num="${diff%"${line}"}"
        printf '<span class="linenum">%s</span>\n' "$(HTML "$num")"
        printf '<span class="line">%s</span>\n' "$(HTML "$line")"
        ;;
    -*) printf '<span class="linedel">%s</span>\n' "$(HTML "$diff")";;
    +*) printf '<span class="lineadd">%s</span>\n' "$(HTML "$diff")";;
    \ *) printf '<span class="line">%s</span>\n' "$(HTML "$diff")";;
    \\\ *) printf '<span class="linenote">%s</span>\n' "$(HTML "$diff")";;
  esac; done
  printf '</section>'
fi

printf '</div>\n'