#!/usr/bin/env bash
# -*- indent-tabs-mode: nil; sh-basic-offset: 2; sh-indentation: 2 -*-
# vi: set et sw=2:

# The sh-indentation in the emacs mode-line is needed for emacs <26, see
# https://debbugs.gnu.org/21751

#
# TODO:
#
# * Check module names entered as dependencies.

set -e

canonicalname(){
  if test $# -ne 1; then
    echo Usage: canonicalname path >&2
    return 1
  fi
  file="`eval echo $1`" # expand ~
  if test ! -e "$file"; then
    echo $file: file not found >&2
    return 1
  fi
  # if this is a symlink, then follow the symlink
  if test -L "$file"; then
    fdir="`dirname \"$file\"`"
    flink="`readlink \"$file\"`"
    if test -e "$flink"; then
      # these are absolute links, or links in the CWD
      canonicalname "$flink"
    else
      canonicalname "$fdir/$flink"
    fi
  else
    # if this is a file, then remember the filename and
    # canonicalize the directory name
    if test -f "$file"; then
      fdir="`dirname \"$file\"`"
      fname="`basename \"$file\"`"
      fdir="`canonicalname \"$fdir\"`"
      echo "$fdir/$fname"
    fi
    # if this is a directory, then create an absolute
    # directory name and we are done
    if test -d "$file"; then
      (cd "$file"; pwd)
    fi
  fi
}

canonicalpath(){
  if test $# -ne 1; then
    echo Usage: canonicalpath path >&2
    return 1
  fi
  dirname "$(canonicalname "$1")"
}

pkg_config_dependencies(){
  if test $# -ne 1; then
    echo Usage: pkg_config_dependencies name >&2
    return 1
  fi
  name="$1"
  depends="`pkg-config --variable=DEPENDENCIES $name| sed -e 's/,/ /g'`"
  for pkg in $depends; do
    depends="$depends `pkg_config_dependencies $pkg`"
  done
  echo $depends
}

# modulesexist DEPS MODULES
#
# DEPS is a space seperated list of modules the new module should depend on
# MODULES is a space seperated list of modules that are known to be present
#
# Each name in DEPS is checked to see wether it is present in MODULES.  If
# not, is is checked whether it can be found with pkg-config.  If still no, an
# error message is issued and modulesexist will return with an exit status
# indicating failure.
modulesexist(){
  local status dep found
  status=0

  for dep in $1; do
    found=false
    if [[ " $2 " == *" $dep "* ]]; then
      found=true
    fi
    # If module not found in list, try pkg-config
    if ! $found && pkg-config $dep &> /dev/null; then
       found=true
    fi
    if ! $found; then
      echo "ERROR:">&2
      echo "Module with name $dep was not found" >&2
      echo "Did you forget to specify its location" >&2
      echo "in the DUNE_CONTROL_PATH variable?">&2
      echo >&2
      status=1
    fi
  done

  return $status
}

make_unique(){
  if [ "$#" = "1" ]; then
    # take first word
    for exclude_word in $1; do
      break;
    done
    make_unique $exclude_word "$1" 0
  else
    local exclude_word="$1"
    local words="$2"
    local pos="$3"
    local length=0
    local i=0
    local new_words=""
    local cur=0
    for word in $words; do
      if [ $i -le $pos ]; then
	i=$((i+1))
	length=$((length+1))
	new_words="$new_words $word"
	continue
      fi
      if [ "$word" != "$exclude_word" ]; then
	new_words="$new_words $word"
	if [ "$((length-1))" = "$pos" ]; then
	  next_word="$word"
	fi
	length=$((length+1))
      fi
    done
    if [ "$pos" -lt "$length" ]; then
      # process next word
      make_unique "$next_word" "$new_words" $((pos+1))
    else
      export UNIQUE_WORDS="$new_words"
    fi
  fi
}

echo
echo == Dune project/module generator ==
echo
echo duneproject will assist you in the creation of a new Dune application.
echo During this process a new directory with the name of your project will be
echo created. This directory will hold all configuration and Makefiles and a
echo simple example application.
echo

################## FIND AVAILABLE MODULES ##################

. "$(canonicalpath $0)/../lib/dunemodules.lib"

export PREFIX_DIR="`canonicalpath "$0"`/.."

extract_multiarch_pkg_config_path

# search for modules, both installed and src modules
find_modules_in_path

# sort modules to remove duplicates
sort_modules $FOUND_MODULES
FOUND_MODULES=$MODULES

# get the real module names
MODULES=""
for i in $FOUND_MODULES; do
  mod=$(eval echo \$NAME_$i)
  MODULES="$MODULES$mod "
done

if [ "$MODULES" = "" ]; then
  echo "ERROR:">&2
  echo "  No dune modules were found!">&2
  echo "  Did you forget to specify the places where ">&2
  echo "  you installed your modules in the ">&2
  echo "  DUNE_CONTROL_PATH environment variable">&2
  echo "  and adjusted the PKG_CONFIG_PATH environment">&2
  echo "  accordingly?" >&2
  exit 1;
fi

################## READ CMDLINE OPTIONS ##########
PROJECT="$1"
DEPENDENCIES="$2"
VERSION="$3"
MAINTAINER="$4"

################## READ OPTIONS ##################

while [ "$DATACORRECT" != "y" -a "$DATACORRECT" != "Y" ]; do

  while [ -z $PROJECT ]; do
    read -p "1) Name of your new Project? (e.g.: dune-grid): " PROJECT
    if echo "$MODULES" | grep -q ^$PROJECT$; then
      read -p "   A module named $PROJECT already exists. Continue anyway? [y/N] " CONT
      if test x$DELETE = xy -o x$DELETE = xY; then
        PROJECT=""
      fi
    elif echo "$PROJECT" | grep -q "\."; then
      echo "The Name contains a dot (.) which is not allowed."
      PROJECT=""
    fi
  done
  MODULE="$PROJECT"

  DEPOK=1

  while [ "$DEPOK" != 0 ]; do
    echo "2) Which modules should this module depend on?"
    echo "   The following modules have been found:"
    echo "   $MODULES"
    #  for i in $MODULES; do echo -n " $i"; done
    #  echo ""
    while [ -z "$DEPENDENCIES" ]; do
      read -p "   Enter space-separated list: " DEPENDENCIES
    done
    set +e
    modulesexist "$DEPENDENCIES" "$MODULES"
    DEPOK=$?
    set -e
    if [ "$DEPOK" != 0 ]; then
      DEPENDENCIES=""
    fi
  done

  while [ -z $VERSION ]; do
    read -p "3) Project/Module version? " VERSION
  done
  while [ -z "$MAINTAINER" ]; do
    read -p "4) Maintainer's email address? " MAINTAINER
  done

  echo
  echo "creating Project \"$PROJECT\", version $VERSION "
  echo "which depends on \"$DEPENDENCIES\""
  echo "with maintainer \"$MAINTAINER\""
  read -p "Are these informations correct? [y/N] " DATACORRECT

  # reset data if necessary
  if [ "$DATACORRECT" != "y" -a "$DATACORRECT" != "Y" ]; then
    PROJECT=""
    DEPENDENCIES=""
    VERSION=""
    MAINTAINER=""
  fi

done



echo
echo "A sample code $MODULE.cc is generated in the \"$PROJECT\" directory."
echo "Look at the README and dune.module files there."
echo "Now you can run the dunecontrol script which will setup the new module."
echo "Sometimes you may have to tweak CMakeLists.txt a bit."

if test -d $PROJECT; then
  echo WARNING:
  echo "A directory with the name $PROJECT already exists."
  echo "Do you want to continue anyway?"
  read -p "Type Y to overwrite the old directory, N to abort. [y/N] " DELETE
  if test x$DELETE != xy -a x$DELETE != xY; then
    echo Abort...
    exit 1
  fi
  rm -rf "$PROJECT"
fi
mkdir "$PROJECT"

################## dune.module ##################
cat > "$PROJECT/dune.module" <<C_DELIM
################################
# Dune module information file #
################################

# Name of the module
Module: $MODULE
Version: $VERSION
Maintainer: $MAINTAINER
# Required build dependencies
Depends: $DEPENDENCIES
# Optional build dependencies
#Suggests:
C_DELIM

## Create the parameters passed to DUNE_CHECK_ALL

# save module list of dunemodules.inc
save_MODULES=$MODULES
for name in $DEPENDENCIES; do
  mod="`fix_variable_name $name`"
  if test "x$(eval echo \$HAVE_$mod)" != "x"; then
    # found via dunemodules.inc
    sort_modules "$mod"
    for mod in $MODULES; do
      M_DEPS="$M_DEPS $(eval echo \$NAME_$mod)"
    done
    MODULES=$save_MODULES
  else
    # found via pkg-config
    M_DEPS="`pkg_config_dependencies $name` $name"
  fi
  for dep in $M_DEPS; do
    CHECK="$CHECK [$dep]"
  done
done
set +x
make_unique "$CHECK"

# insert , between modules
j=0
for dep in $UNIQUE_WORDS; do
  if [ "$j" = "0" ]; then
    CHECK="$dep"
    j=1
  else
    CHECK="$CHECK, $dep"
  fi
done

echo "------------------------------------------"
echo "writing initial files:"

# complete module name with _ instead of -
fix_and_assign CMODULE $MODULE
# module name without prefix "dune-"
NAME=`echo $PROJECT | sed -e 's/dune[_-]//'`
# $NAME with _ instead of -
NAME_=`echo $NAME | tr '-' '_'`
# module name in uppercase with _ instead of -
UNAME=`echo $PROJECT | tr '-' '_' | sed 's/\(.*\)/\U\1/'`

################## README ##################
echo "- $PROJECT/README"
cat > "$PROJECT/README" <<R_DELIM
Preparing the Sources
=========================

Additional to the software mentioned in README you'll need the
following programs installed on your system:

  cmake >= 3.1

Getting started
---------------

If these preliminaries are met, you should run

  dunecontrol all

which will find all installed dune modules as well as all dune modules
(not installed) which sources reside in a subdirectory of the current
directory. Note that if dune is not installed properly you will either
have to add the directory where the dunecontrol script resides (probably
./dune-common/bin) to your path or specify the relative path of the script.

Most probably you'll have to provide additional information to dunecontrol
(e. g. compilers, configure options) and/or make options.

The most convenient way is to use options files in this case. The files
define four variables:

CMAKE_FLAGS      flags passed to cmake (during configure)

An example options file might look like this:

#use this options to configure and make if no other options are given
CMAKE_FLAGS=" \\
-DCMAKE_CXX_COMPILER=g++-5 \\
-DCMAKE_CXX_FLAGS='-Wall -pedantic' \\
-DCMAKE_INSTALL_PREFIX=/install/path" #Force g++-5 and set compiler flags

If you save this information into example.opts you can pass the opts file to
dunecontrol via the --opts option, e. g.

  dunecontrol --opts=example.opts all

More info
---------

See

     dunecontrol --help

for further options.


The full build system is described in the dune-common/doc/buildsystem (Git version) or under share/doc/dune-common/buildsystem if you installed DUNE!
R_DELIM

################## CMakeLists.txt ##################
echo "- $PROJECT/CMakeLists.txt"
cat> "$PROJECT/CMakeLists.txt" << M_DELIM
# We require CMake version 3.1 to prevent issues
# with dune_enable_all_packages and older CMake versions.
cmake_minimum_required(VERSION 3.1)
project($PROJECT CXX)

if(NOT (dune-common_DIR OR dune-common_ROOT OR
      "\${CMAKE_PREFIX_PATH}" MATCHES ".*dune-common.*"))
    string(REPLACE  \${CMAKE_PROJECT_NAME} dune-common dune-common_DIR
      \${PROJECT_BINARY_DIR})
endif()

#find dune-common and set the module path
find_package(dune-common REQUIRED)
list(APPEND CMAKE_MODULE_PATH "\${PROJECT_SOURCE_DIR}/cmake/modules"
  \${dune-common_MODULE_PATH})

#include the dune macros
include(DuneMacros)

# start a dune project with information from dune.module
dune_project()

dune_enable_all_packages()

add_subdirectory(src)
add_subdirectory(dune)
add_subdirectory(doc)
add_subdirectory(cmake/modules)

# finalize the dune project, e.g. generating config.h etc.
finalize_dune_project(GENERATE_CONFIG_H_CMAKE)
M_DELIM

################## PROJECT.PC.IN ##################
echo "- $PROJECT/$MODULE.pc.in"
cat> "$PROJECT/$MODULE.pc.in" << CC_DELIM
prefix=@prefix@
exec_prefix=@exec_prefix@
libdir=@libdir@
includedir=@includedir@
CXX=@CXX@
CC=@CC@
DEPENDENCIES=@REQUIRES@

Name: @PACKAGE_NAME@
Version: @VERSION@
Description: $MODULE module
URL: http://dune-project.org/
Requires: ${DEPENDENCIES}
Libs: -L\${libdir}
Cflags: -I\${includedir}
CC_DELIM
echo "    Please remember to update your $PROJECT/$MODULE.pc.in,"
echo "    Description and URL are missing right now."

################# config.h.cmake #####################

echo "- $PROJECT/config.h.cmake"
cat> "$PROJECT/config.h.cmake" <<EOF
/* begin $PROJECT
   put the definitions for config.h specific to
   your project here. Everything above will be
   overwritten
*/

/* begin private */
/* Name of package */
#define PACKAGE "@DUNE_MOD_NAME@"

/* Define to the address where bug reports for this package should be sent. */
#define PACKAGE_BUGREPORT "@DUNE_MAINTAINER@"

/* Define to the full name of this package. */
#define PACKAGE_NAME "@DUNE_MOD_NAME@"

/* Define to the full name and version of this package. */
#define PACKAGE_STRING "@DUNE_MOD_NAME@ @DUNE_MOD_VERSION@"

/* Define to the one symbol short name of this package. */
#define PACKAGE_TARNAME "@DUNE_MOD_NAME@"

/* Define to the home page for this package. */
#define PACKAGE_URL "@DUNE_MOD_URL@"

/* Define to the version of this package. */
#define PACKAGE_VERSION "@DUNE_MOD_VERSION@"

/* end private */

/* Define to the version of $PROJECT */
#define ${UNAME}_VERSION "@${UNAME}_VERSION@"

/* Define to the major version of $PROJECT */
#define ${UNAME}_VERSION_MAJOR @${UNAME}_VERSION_MAJOR@

/* Define to the minor version of $PROJECT */
#define ${UNAME}_VERSION_MINOR @${UNAME}_VERSION_MINOR@

/* Define to the revision of $PROJECT */
#define ${UNAME}_VERSION_REVISION @${UNAME}_VERSION_REVISION@

/* end $PROJECT
   Everything below here will be overwritten
*/
EOF
## done

###############################################################
################## The source subdirectory ####################
###############################################################

mkdir "$PROJECT/src"

################## src/CMakeLists.txt ##################

echo "- $PROJECT/src/CMakeLists.txt"
cat> "$PROJECT/src/CMakeLists.txt" << M_DELIM
add_executable("${MODULE}" ${MODULE}.cc)
target_link_dune_default_libraries("${MODULE}")
M_DELIM

################## PROJECT.CC ##################
echo "- $PROJECT/src/$MODULE.cc"
cat> "$PROJECT/src/$MODULE.cc" << CC_DELIM
// -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
// vi: set et ts=4 sw=2 sts=2:

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <iostream>
#include <dune/common/parallel/mpihelper.hh> // An initializer of MPI
#include <dune/common/exceptions.hh> // We use exceptions

int main(int argc, char** argv)
{
  try{
    // Maybe initialize MPI
    Dune::MPIHelper& helper = Dune::MPIHelper::instance(argc, argv);
    std::cout << "Hello World! This is ${PROJECT}." << std::endl;
    if(Dune::MPIHelper::isFake)
      std::cout<< "This is a sequential program." << std::endl;
    else
      std::cout<<"I am rank "<<helper.rank()<<" of "<<helper.size()
        <<" processes!"<<std::endl;
    return 0;
  }
  catch (Dune::Exception &e){
    std::cerr << "Dune reported error: " << e << std::endl;
  }
  catch (...){
    std::cerr << "Unknown exception thrown!" << std::endl;
  }
}
CC_DELIM

################################################################
################## The headers subdirectory ####################
################################################################

echo "- $PROJECT/dune/$NAME"
mkdir "$PROJECT/dune"
mkdir "$PROJECT/dune/$NAME"

################## dune/CMakeLists.txt #################
echo "- $PROJECT/dune/CMakeLists.txt"
cat> $PROJECT/dune/CMakeLists.txt <<EOF
add_subdirectory($NAME)
EOF

################## dune/$NAME/CMakeLists.txt ###########
echo "- $PROJECT/dune/$NAME/CMakeLists.txt"
cat> $PROJECT/dune/$NAME/CMakeLists.txt <<EOF
#install headers
install(FILES ${NAME}.hh DESTINATION \${CMAKE_INSTALL_INCLUDEDIR}/dune/$NAME)
EOF

################## dune/$NAME/$NAME.hh #################
echo "- $PROJECT/dune/$NAME/$NAME.hh"
cat> $PROJECT/dune/$NAME/$NAME.hh <<EOF
#ifndef ${UNAME}_HH
#define ${UNAME}_HH

// add your classes here

#endif // ${UNAME}_HH
EOF


###############################################################
################## The doc subdirectory #######################
###############################################################

mkdir "$PROJECT/doc"

################## doc/CMakeLists.txt #################
echo "- $PROJECT/doc/CMakeLists.txt"
cat> "$PROJECT/doc/CMakeLists.txt" << CC_DELIM
add_subdirectory("doxygen")
CC_DELIM

###############################################################
############### The doc/doxygen subdirectory ##################
###############################################################

mkdir "$PROJECT/doc/doxygen"

#################### basic Doxylocal ##########################

echo "- $PROJECT/doc/doxygen/Doxylocal"
if [ "x`which doxygen`" == "x" ]; then
    echo "Doxygen is not installed! Your documentation will not work without it."
fi
# Where to search and which files to use
cat> $PROJECT/doc/doxygen/Doxylocal << CC_DELIM
# This file contains local changes to the doxygen configuration
# please use '+=' to add files/directories to the lists

# The INPUT tag can be used to specify the files and/or directories that contain
# documented source files. You may enter file names like "myfile.cpp" or
# directories like "/usr/src/myproject". Separate the files or directories
# with spaces.

INPUT                 += @top_srcdir@/dune/
# see e.g. dune-grid for the examples of mainpage and modules
# INPUT                 += @srcdir@/mainpage \\
#                          @srcdir@/modules

# The EXCLUDE tag can be used to specify files and/or directories that should
# be excluded from the INPUT source files. This way you can easily exclude a
# subdirectory from a directory tree whose root is specified with the INPUT tag.

# EXCLUDE               += @top_srcdir@/dune/$NAME/test

# The EXAMPLE_PATH tag can be used to specify one or more files or
# directories that contain example code fragments that are included (see
# the \include command).

# EXAMPLE_PATH          += @top_srcdir@/src

# The IMAGE_PATH tag can be used to specify one or more files or
# directories that contain image that are included in the documentation (see
# the \image command).

# IMAGE_PATH            += @top_srcdir@/dune/$NAME/pics
CC_DELIM

################# doc/doxygen/CMakeLists.txt #####################

echo "- $PROJECT/doc/doxygen/CMakeLists.txt"
cat> "$PROJECT/doc/doxygen/CMakeLists.txt" << CC_DELIM
# shortcut for creating the Doxyfile.in and Doxyfile
add_doxygen_target()
CC_DELIM

#########################################################
############### The cmake subdirectory ##################
#########################################################

mkdir "$PROJECT/cmake"

#########################################################
############### The cmake/modules subdirectory ##########
#########################################################

mkdir "$PROJECT/cmake/modules"

macroname=""
for i in $(echo $PROJECT| sed 's/-/ /g'); do
  firstchar=$(echo $i | sed 's/\(.\).*/\1/')
  macroname=$macroname$(echo $firstchar | tr '[a-z]' '[A-Z]')$(echo $i | sed 's/.\(.*\)/\1/')
done
macroname="$macroname""Macros.cmake"

################# cmake/modules/CMakeLists.txt #####################

echo "- $PROJECT/cmake/modules/CMakeLists.txt"
cat> "$PROJECT/cmake/modules/CMakeLists.txt" <<EOF
set(modules "$macroname")

install(FILES \${modules} DESTINATION \${DUNE_INSTALL_MODULEDIR})
EOF

################# cmake/modules/$macroname #####################

echo "- $PROJECT/cmake/modules/$macroname"
cat> "$PROJECT/cmake/modules/$macroname" <<EOF
# File for module specific CMake tests.
EOF


#################           done           #####################

echo
echo "done."
echo "------------------------------------------"
echo "For further details read the Dune build system documentation at"
echo "https://www.dune-project.org/buildsystem/"
