#!/bin/sh

_EXEC="${_EXEC:-${0%/*}/}"
_DATA="${_DATA:-.}"

. "$_EXEC"/cgilite/cgilite.sh
. "$_EXEC"/cgilite/session.sh
. "$_EXEC"/cgilite/file.sh
. "$_EXEC"/session_lock.sh

git init "$_DATA" >/dev/null &

export MD_HTML="false"
markdown() {
  local awkbin=`which awk`
  if [ "$awkbin" ]; then
    "$awkbin" -f "$_EXEC"/cgilite/markdown.awk
  else
    busybox awk -f "$_EXEC"/cgilite/markdown.awk
  fi
}

yield_page(){
  title="${1:-WebTXT}" page="$2"
  printf '%s\r\n' 'Content-Type: text/html; charset=utf-8' \
                  "Content-Security-Policy: script-src 'none'" \
                  ''
  { printf '[html
    [head
      [meta name="viewport" content="width=device-width"]
      [link rel="stylesheet" type="text/css" href="common.css"]
      [link rel="stylesheet" type="text/css" href="webnote.css"]
      [title %s]
    ] [body class="%s"
  ' "$title" "$page"
  cat
  printf '] ]'
  } |"$_EXEC/cgilite/html-sh.sed" -u
}

pagename() {
  local name page="${1##*/}"
  name="$(sed -nE "/[a-zA-Z0-9].[^\r 	]/{s;\r$;;; p; q;};" "$_DATA/$page")"
  [ "$name" ] && printf %s "$name" \
              || printf %s "$page"
}

recent="$(COOKIE pages)"

case ${PATH_INFO##*/} in
  favicon.ico) printf '%s\r\n' 'Content-Length: 0' '';;
  common.css) FILE "$_EXEC/cgilite/common.css";;
  webnote.css) FILE "$_EXEC/webnote.css";;
  '') yield_page <<-EOF
	[form .new action=new [button type=submit New Note]
          $(if [ "$recent" ]; then
	    printf '[h2 Recent Pages][ul .recent'
	    for page in $recent; do
	      [ -f "$_DATA/$(printf %s "$page" |checkid)" ] \
              && printf '[li [a href="./%s" . %s]]' "$page" "$(pagename "$page" |HTML)"
	    done
            printf ']'
	  fi)
	]
	EOF
    return 0
    ;;
  new)
    newid="$(timeid)"
    touch "$_DATA/$newid"
    git -C "$_DATA" add "$newid" >/dev/null
    git -C "$_DATA" commit -m "new note \"${newid}\"" "$newid" >/dev/null
    REDIRECT "./$newid"
    ;;
esac

doc="$_DATA/$(printf %s ${PATH_INFO##*/} |checkid)"

if [ ! -f "$doc" ]; then
  REDIRECT "${PATH_INFO%/*}/"
  return 0
fi

[ $REQUEST_METHOD = POST ] && case $(POST action) in
  edit)
    if temp=$(SLOCK "$doc"); then
      yield_page "$(pagename "$doc" |HTML)" <<-EOF
	[form method=POST
          [input type=hidden name=session_key value="$SESSION_KEY"]
	  [button type=submit name=action value=cancel Cancel]
	  [button type=submit name=action value=update Update]
	  [textarea name=document . $(HTML <"$doc")]
	]
	EOF
    else
      yield_page "$(pagename "$doc" |HTML) - Error" <<-EOF
	[p .error .locked Someone else is already editing this Dokument. Wait a few minutes and try again. [a href="$PATH_INFO" Nothing else I can do.]]
	EOF
    fi
    return 0
    ;;
  cancel)
    RELEASE_SLOCK "$doc"
    REDIRECT "$PATH_INFO"
    ;;
  update)
    if temp=$(CHECK_SLOCK "$doc"); then
      RELEASE_SLOCK "$doc"
      POST document >"${doc}"
      git -C "$_DATA" commit -m "update note ${doc##*/} \"$(pagename "$doc")\"" "${doc##*/}" >/dev/null
      REDIRECT "$PATH_INFO"
    else
      yield_page "$(pagename "$doc" |HTML) - Error" <<-EOF
	[p .error .stolen Your edit took too long and someone else is now editing this file. [a href="$PATH_INFO" Dang, I must be quicker next time!]]
	[p Copy your Content for reference:]
	[div .text . $(POST document |HTML)]
	EOF
    fi
    return 0
    ;;
esac

printf %s "$recent" |grep -qwF "${doc##*/}" \
|| SET_COOKIE +$((90 * 86400)) pages="${recent}${recent+ }${doc##*/}" Path="${PATH_INFO%/*}/"

yield_page "$(pagename "$doc" |HTML)" <<-EOF
	[form method=POST
          [input type=hidden name=session_key value="$SESSION_KEY"]
	  [button type=submit name=action value=edit Edit]
	]
	[div .text . $(markdown <"$doc")]
	EOF