#!/bin/bash
########################################################################
#  Copyright (C) 2016 Max Mehl <max.mehl@fsfe.org>
########################################################################
#  
#  This program is free software: you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation, either version 3 of the License, or
#  (at your option) any later version.
#  
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#  
#  You should have received a copy of the GNU General Public License
#  along with this program.  If not, see <http://www.gnu.org/licenses/>.
#  
########################################################################
#  
#  A script to preview XHTML files locally, best to use with FSFE's 
#  website setup.
#  
#  Instructions: https://blog.mehl.mx/2016/build-fsfe-websites-locally/
#  
#######################################################################

ROOT=$(dirname "$(readlink -f "$0")")
if [ ! -e "$ROOT"/config.cfg ]; then echo "Missing config.cfg file. Edit and rename config.cfg.sample"; exit 1; fi
source "$ROOT"/config.cfg

# Help listing
if [ "$1" = "" ]; then
  self=$(basename $0) 
  echo "No parameters or variables given!"
  echo
  echo "Usage: "
  echo
  echo "$self file.en.xhtml"
  echo "   -- build single XHTML file from your source to the local web directory"
  echo "      the destination will be on the same relative level of the selected XHTML file"
  echo "      If not a XHTML file, it will be copied to the web directory"
  echo
  echo "$self --copy picture.png look/style.css"
  echo "   -- Just copies several files to the local web directory without even trying to build them"
  exit 0
fi

# Remove trailing slashes
LOC_trunk=$(echo $LOC_trunk | sed 's|/$||')
LOC_out=$(echo $LOC_out | sed 's|/$||')
LOC_trunk_dev=$(echo $LOC_trunk_dev | sed 's|/$||')

# Pure copy
if [ "$1" = "--copy" ]; then
  numargs=$(($# - 1))
  echo "[INFO] Starting a plain mass copy with $numargs files..."
  for ((i=1; i <= $numargs; i++)); do
    SRC_full=$(realpath $2)
    DST_full=$(echo $SRC_full | sed -E "s|$LOC_trunk|$LOC_out|")
    echo "[INFO] Copying $SRC_full to $DST_full..."
    cp -R $SRC_full $DST_full
    shift
  done
  echo "[SUCCESS] Copying finished. Files should be visible via the local webserver now."
  exit 0
fi

SRC_rel=$1  # e.g. index.en.xhtml
SRC_full=$(realpath $SRC_rel) # Full path to source file

# CHECK whether the source file is located in LOC_trunk
if [ ! $(echo $SRC_full | grep "$LOC_trunk") ]; then
  echo "[ERROR] Given source file is not part of \$LOC_trunk (currently set to \"$LOC_trunk\"). Please only build files which reside in or below this directory. Aborting now."
  exit 1
fi

# TEST if a DEV SVN directory is used. If yes, copy clean file to this Dir
if [ "$LOC_trunk_dev" != "" ]; then
  SRC_full_dev=$(echo $SRC_full | sed -E "s|$LOC_trunk|$LOC_trunk_dev|")
  echo "[INFO] A \"dirty\" Development SVN directory ($LOC_trunk_dev) is being used. Copy file from clean SVN directory ($LOC_trunk) to Development directory..."
  cp $SRC_full $SRC_full_dev  # copy file from clean SVN to dev/dirty SVN
  SRC_full=$SRC_full_dev
  LOC_trunk=$LOC_trunk_dev
fi

echo "[INFO] Using file $SRC_full as source..."

### TRANSFORM XHTML file path
DST_full=$(echo $SRC_full | sed -E "s|$LOC_trunk|$LOC_out|")  # replace SVN directory by build/HTTP destination

### BUILD/COPY FILE depending on file extension
ftype=${SRC_full##*.} # get extension of file
ftype=$(echo "$ftype" | tr '[:upper:]' '[:lower:]')
ftype_build="xhtml" # file types which have to be built

if [[ "$ftype" == @($ftype_build) ]]; then  # XHTML file
  DST_full=$(echo $DST_full | sed -E "s/$ftype_build/html/")  # Replace xhtml by html
  echo "[INFO] XHTML file detected. Going to build into $DST_full ..."
  
  xmllint --noout "$SRC_full" || (echo; echo "[ERROR] Syntax error in $SRC_full. Error message above. Please fix!"; exit 1)
  if [[ "$?" != "0" ]]; then exit 1; fi
  
  $LOC_trunk/build/build_main.sh process_file $SRC_full > $DST_full

else # just copy file
  echo "[INFO] File type ($ftype) is detected as not to be built. Just copying it to $DST_full ..."
  cp $SRC_full $DST_full
fi


### START WEBSERVER if necessary
if [ "$HTTPD" == "python" ]; then   # python
  if [ ! $(pgrep -f "pywebserver-fsfe.py $LOC_out") ]; then
    echo "[INFO] Starting $HTTPD webserver"
    nohup "$ROOT/pywebserver-fsfe.py" "$LOC_out" "$HTTPD_port" > "$ROOT"/pywebserver-fsfe.log 2>&1 &
  else
    echo "[INFO] $HTTPD webserver already seems to be running."
  fi
elif [ "$HTTPD" == "lighttpd" ]; then
  if [ ! $(pgrep lighttpd) ]; then   # lighttpd
    echo "[INFO] Starting $HTTPD webserver"
    /usr/sbin/lighttpd -f "$HTTPD_conf"
  else
    echo "[INFO] $HTTPD webserver already seems to be running."
  fi
elif [ "$HTTPD" == "" ]; then   # empty variable
  echo "[ERROR] No webserver specified. Please define variable HTTPD in config.cfg. Aborting now."
  exit 1
else    # something custom
  echo "[WARNING] Unknown webserver defined. Please check variable HTTPD in config.cfg." 
fi

### SHOW RESULTS
echo
DST_rel=$(echo $DST_full | sed "s|$LOC_out||") # relative path
echo "[SUCCESS] Finished. File can be viewed at http://localhost:5080$DST_rel"