#! /bin/sh
#
# Necessary preparations/configurations for the reproduction pipeline.
#
# Original author:
#     Mohammad Akhlaghi <mohammad@akhlaghi.org>
# Contributing author(s):
#     Your name <your@email.address>
# Copyright (C) 2018, Your Name.
#
# This script 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 script 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.
#
# A copy of the GNU General Public License is available at
# <http://www.gnu.org/licenses/>.





# Script settings
# ---------------
# Stop the script if there are any errors.
set -e





# Important internal locations
# ----------------------------
#
# These are defined to help make this script more readable.
topdir=$(pwd)
installedlink=.local
cdir=reproduce/config

pdir=$cdir/pipeline
pconf=$pdir/LOCAL.mk
ptconf=$pdir/LOCAL_tmp.mk
poconf=$pdir/LOCAL_old.mk
glconf=$cdir/gnuastro/gnuastro-local.conf





# Inform the user
# ---------------
#
# Print some basic information so the user gets a feeling of what is going
# on and is prepared on what will happen next.
echo
echo "-----------------------------------------"
echo "Reproduction pipeline local configuration"
echo "-----------------------------------------"
echo
echo "Local configuration includes things like top-level directories,"
echo "or processing steps."
echo
echo "It is STRONGLY recommended to read the comments, and set the best "
echo "values for your system (where necessary)."
echo





# Identify the downloader tool
# ----------------------------
#
# We use Wget for the downloading. As of November 12th, cURL couldn't
# download Ghostscript's source from its standard address, but Wget
# could. Until November 12th, we would check for cURL or Wget, so we
# defined this check system here (explained in the next paragraph of this
# comment). For now its redundant, but if the fix for cURL is found later,
# we can add it back (or add other downloaders). So we'll keep it.
#
# Since the options specifying the output filename are different between
# the two, we'll also specify the output option within the `downloader'
# variable. So it is important to first give the output filename after
# calling `DOWNLOADER' within the Makefiles, and finish the command with
# the web address.
print_downloader_notice=1
if type wget > /dev/null; then
    downloader="wget -O";
else
    echo "======="
    echo "Warning"
    echo "======="
    echo "Couldn't find GNU Wget. It is used for downloading necessary "
    echo "programs and data if they aren't already present in the specified "
    echo "directories. Therefore the pipeline will crash if the necessary "
    echo "files are not already present on the system."
    echo "======="
    echo
    downloader="no-downloader-found"
fi;





# Write values obtained so far
# ----------------------------
#
# We'll start writing of the local configuration file with the values that
# have been found so far.
sed -e 's|@downloader[@]|'"$downloader"'|g' $pconf.in > $ptconf





# Remove possibly existing configuration file?
# --------------------------------------------
#
# `LOCAL.mk' is the top-most local configuration for the pipeline. If it
# already exists when this script is run, we'll make a copy of it as backup
# (for example the user might have ran `./configure' by mistake).
if [ -f $pconf ]; then

    # If it already exits, see what the user wants to do.
    while [ "$userread" != "y" -a "$userread" != "n" ]
    do
        read -p"A configuration already exists, re-configure (y/n)? " userread
    done

    # Move the configuration if requested.
    if [ $userread = "y" ]; then
        if mv $pconf $poconf; then
            echo "-- Existing configuration moved to '$poconf'."
        fi
    else
        echo "-- Using existing configuration file."
    fi
    echo
fi





# Let user edit local settings
# ----------------------------
#
# If the configuration file exists at this stage, the user didn't want to
# change it. So, we'll open a text editor for the user to read the comments
# of the necessary local settings and set the top directories manually.
if ! [ -f $pconf ]; then

    if [ x"$EDITOR" = "x" ]; then
        userread=$EDITOR
    else
        userread=not-an-editor
    fi

    while ! $userread $ptconf > /dev/null 2>&1
    do
        read -p"Your favorite text editor: " userread
    done
    echo
fi





# Notice for top of files
# -----------------------
#
# In case someone opens the files output from the configuration scripts in
# a text editor and wants to edit them, it is important to let them know
# that their changes are not going to be permenant.
function create_file_with_notice() {
    if echo "# IMPORTANT: file will be RE-WRITTEN after './configure'" > $1
    then
        echo "#"                                                      >> $1
        echo "# This file was created during the reproduction"        >> $1
        echo "# pipeline's configuration ('./configure'). Therefore," >> $1
        echo "# it is not under version control and any manual "      >> $1
        echo "# changes to it will be over-written if the pipeline "  >> $1
        echo "# is re-configured."                                    >> $1
        echo "#"                                                      >> $1
    else
        exit 1
    fi
}





# --------- Delete for no Gnuastro ---------
# Gnuastro's local configuration settings
#
# The `minmapsize' parameter has been set by the user, so we can read it
# and add it to Gnuastro's local configuration file.
create_file_with_notice $glconf
mm=$(awk '$1=="MINMAPSIZE"{print $3}' $ptconf)
echo "# Minimum number of bytes to use HDD/SSD instead of RAM." >> $glconf
echo " minmapsize $mm"                                          >> $glconf
# ------------------------------------------





# Final pipeline local settings
# -----------------------------
#
# Make the final file that will be used and delete the temporary file along
# with a possible file ending with `~' that is put there by some editors.
if ! [ -f $pconf ]; then
    create_file_with_notice $pconf
    cat $ptconf >> $pconf
fi
rm -f $ptconf $ptconf"~"




# Read the necessary directories and build the top build directory as well
# as the symbolic link to it.
lbdir=reproduce/build
rm -f $lbdir

bdir=$(awk '/BDIR =/             {print $3}' $pconf)
ddir=$(awk '/DEPENDENCIES-DIR =/ {print $3}' $pconf)
if ! [ -d $bdir ]; then mkdir $bdir; fi
absolutebdir=$(readlink -f $bdir)
ln -s $absolutebdir $lbdir

depdir=$absolutebdir/dependencies
if ! [ -d $depdir ];  then mkdir $depdir; fi

tardir=$depdir/tarballs
if ! [ -d $tardir ];  then mkdir $tardir; fi

instdir=$depdir/installed
if ! [ -d $instdir ]; then mkdir $instdir; fi

rm -f $installedlink
ln -s $instdir $installedlink

echo "Build directory ready: $absolutebdir";
echo "... 'reproduce/build' is a symbolic link to it (for easy access).";
echo





# Notice on build Make and Bash, build top directories
# ----------------------------------------------------
tsec=0
echo;
echo;
echo "----------------";
echo "Necessary reproduction pipeline dependencies will be built in $tsec sec."
echo
echo "NOTE: the built software will NOT BE INSTALLED on your system, they"
echo "are only for local usage by this reproduction pipeline."
echo
sleep $tsec
export USE_LOCAL_BASH=no
bindir=$bdir/dependencies/installed/bin
make -f reproduce/src/make/dependencies.mk $bindir/bash $bindir/make -j2





# Build the final symbolic links
cd $topdir
rm -f Makefile
ln -s $(pwd)/reproduce/src/make/Top-Makefile Makefile
# --------- Delete for no Gnuastro ---------
rm -f .gnuastro
ln -s $(pwd)/reproduce/config/gnuastro .gnuastro
# ------------------------------------------





# Build all the necsesary dependencies
# ------------------------------------
#
# We will be making all the dependencies before running the top-level
# Makefile. To make the job easier, we'll do it in a Makefile, not a
# script. Bash and Make were the tools we need to run Makefiles, so we had
# to build them in this script. But after this, we can rely on Makefiles.
export USE_LOCAL_BASH=yes
.local/bin/make -f reproduce/src/make/dependencies.mk -j8





# Print a final notice
# --------------------
#
# The configuration is now complete, we can inform the user on the next
# step(s) to take.
echo
echo "------"
echo "The reproduction pipeline and its environment are SUCCESSFULLY configured."
echo "Please run the following command to start."
echo
echo "(Replace '8' with the number of CPU threads)"
echo
echo "    .local/bin/make -j8"
echo
echo "To change the configuration later, please re-run './configure',"
echo "DO NOT manually edit the relevant files."
echo