#!/usr/bin/env bash
#
# The following build specific variables are set and used in libpbuild.bash:
#       ARGS
#       BUILD_SCRIPT
#       BUILDBLOCK_DIR
#
#.............................................................................

declare VERSION='@PMODULES_VERSION@'

# get absolute path of script
declare	    mydir=$(dirname "$0")
declare -r  mydir=$(cd ${mydir} && pwd -P)

# initialize PATH,
# add library installation directories to the PATH,
# so 'source' is able find them

if [[ $(uname -s) == 'Darwin' ]]; then
        PATH='/usr/local/bin:'
else
        PATH=''
fi
PATH+='/usr/bin:/bin:/usr/sbin:/sbin'
PATH+=":${mydir}"
PATH+=":${mydir}/../lib:${mydir}/../config"

source libstd.bash    || {
        echo "Oops: cannot source library -- '$_'" 1>&2; exit 3;
}

source libpbuild.bash    || \
        std::die 3 "Oops: cannot source library -- '$_'"

# save arguments, (still) required for building dependencies
declare -r ARGS="$@"

##############################################################################
#
usage() {
	std::error "
USAGE:
        $0 [options..] [build_script] version

MANDATORY ARGUMENTS:

version
        Variant of module to build.

SELECT VARIANT TO BUILD:

--system
        Specify the system for selecting a variants. Defaults to the
	output of 'uname -s'.

--with=P/V
        Select variant to compile. Use multiple '--with' arguments
	to make the selected variant unique.

BUILD-STEPS OPTIONS:

--prep
	Prepare sources: unpack sources and apply patches only.

--configure
	Prepare and configure sources.

--compile
	Prepare, configure and compile everything.

--install
	Prepare, configure and compile everything. Finally run install
	step. Do not cleanup build and source directory.

--all
	Run throu all steps including cleanup.

--update-modulefiles
	Only install the modulefile and set the release.

MISCELLANEOUS OPTIONS:

-? | -h | --help
        Print usage.

-V | --version )
        Print version.

-v | --verbose )
        Verbose output.

-j N | --jobs=N
        Run N parallel make jobs.

-f | --force-rebuild
        Force rebuild of module.

--dry-run
	Dry run.

--disable-cleanup-build
--enable-cleanup-build
	Cleanup files in the build directory. Default is to remove.
      	all files in the build-directory.

--disable-cleanup-src
--enable-cleanup-src
	Cleanup files in the source directory. Default is to
	remove all files in the source directory.

--disable-cleanup
--enable-cleanup
	Cleanup all files in temporary directory. Default is to
	remove all files created during building.

--distdir
	Directory wwhere to store and lookup downloaded files.

--tmpdir
        Directory used for building a module.

"
	exit 1
}

##############################################################################
#
# parse options and arguments
#

# multiple version can be passed via comand line
declare -a      versions=()
declare         opt_all_variants='no'
declare         opt_bootstrap='no'
declare 	opt_build_config='modbuild.conf'
declare         opt_build_target='all'
declare         opt_distfiles_dir="${PMODULES_ROOT}/var/distfiles"
declare         opt_dry_run='no'
declare         opt_enable_cleanup_build='yes'
declare         opt_enable_cleanup_src='yes'
declare         opt_force_rebuild='no'
declare -i      opt_jobs=3
declare         opt_update_modulefiles='no'
declare         opt_system=''
declare         opt_temp_dir="${PMODULES_TMPDIR:-/var/tmp/${USER}}"
declare         opt_verbose='no'
# array collecting all modules specified on the command line via '--with=module'
declare -a      opt_with_modules=()

parse_args() {
	while (( $# > 0 )); do
		case $1 in
		-j )
                        opt_jobs="$2"
			shift
			;;
		--jobs=[0-9]* )
			opt_jobs="${1/--jobs=}"
			;;
		-v | --verbose )
			trap 'echo "$BASH_COMMAND"' DEBUG
                        opt_verbose='yes'
			;;
		--debug )
			set -x
			;;
		-f | --force-rebuild )
                        opt_force_rebuild='yes'
			;;
		-\? | -h | --help )
			usage
			;;
                -V | --version )
                        std::die 0  "\nPmodules version ${VERSION}\nCopyright GNU GPL v2\n"
                        ;;
		--dry-run )
			opt_dry_run='yes'
			;;
		--config )
			opt_build_config="$2"
			shift 1
			;;
		--config=* )
			opt_build_config="${1#*=}"
			;;
		--enable-cleanup )
			opt_enable_cleanup_build='yes'
			opt_enable_cleanup_src='yes'
			;;
		--disable-cleanup )
			opt_enable_cleanup_build='no'
			opt_enable_cleanup_src='no'
			;;
		--enable-cleanup-build )
			opt_enable_cleanup_build='yes'
			;;
		--disable-cleanup-build )
			opt_enable_cleanup_build='no'
			;;
		--enable-cleanup-src )
			opt_enable_cleanup_src='yes'
			;;
		--disable-cleanup-src )
			opt_enable_cleanup_src='no'
			;;
		--distdir )
			opt_distfiles_dir="$2"
			shift
			;;
		--distdir=* )
			opt_distfiles_dir="${1/--distdir=}"
			;;
		--tmpdir )
                        opt_temp_dir="$2"
			shift
			;;
		--tmpdir=* )
			opt_temp_dir="${1/--tmpdir=}"
			;;
		--system )
			opt_system="$2"
			shift
			;;
		--system=* )
			opt_system="${1/*=}"
			;;
		--with )
			opt_with_modules+=( "$2" )
			shift
			;;
		--with=*/* )
			m="${1/--with=}"
			opt_with_modules+=( ${m} )
			;;
		--prep | --configure | --compile | --install | --all )
			opt_build_target=${1:2}
			;;
		--bootstrap )
			opt_bootstrap='yes'
			;;
		--update-modulefiles )
			opt_update_modulefiles='yes'
			;;
                -- )
                        :
                        ;;
		-* )
			std::die 1 "Invalid option -- '$1'"
			;;
		[=0-9]* )
			versions+=( "$1" )
			;;
		'')	
			:
			;;
		* )
			[[ -z "${BUILD_SCRIPT}" ]] || \
				std::die 1 "%s "\
					 "Build script already set to" \
					 "'${BUILD_SCRIPT}' -- '$1'"
		        BUILD_SCRIPT=$(std::get_abspath "$1")
			test -r ${BUILD_SCRIPT} || \
				std::die 1 "%s " \
					 "Build script does not exist" \
					 "or is not readable -- '$_'"
			BUILDBLOCK_DIR=$(dirname "${BUILD_SCRIPT}")
			;;
		esac
		shift
	done	
	[[ -n ${BUILD_SCRIPT} ]] || std::die 1 "No build-block specified!"
	(( ${#versions[@]} > 0)) || std::die 1 "Module version not specified!"
}

find_variants_files(){
        shopt -q nullglob || :
        local -i nullglob_set=$?
        shopt -s nullglob
        local files=( "${BUILDBLOCK_DIR}"/*/variants.${opt_system} )
        files+=( "${BUILDBLOCK_DIR}"/*/variants.$(uname -s) )
        local f
	for f in "${BUILDBLOCK_DIR}"/*/variants; do
		[[ -e "${f}.${opt_system}" ]] \
                        || [[ -e "${f}.$(uname -s)" ]] \
                        || files+=( "$f" )
	done
        (( nullglob_set == 1 )) && shopt -u nullglob
	std::upvar "$1" "${files[@]}"
}

shopt -s extglob
expand_variants_file(){
	expand_deps(){
		local text="$1"
                shift
		local deps=( "${@}" )
                echo "${deps[@]}"
                if (( ${#deps[@]} == 0 )); then
                        echo ${text}
		else
                        local list
		        eval list=( ${deps[0]} )
			for dep in ${list[*]}; do
				expand_deps "${text} ${dep}" "${deps[@]:1}"
			done
		fi
	}

	local -r input="$1"
	while read -a toks; do
		# skip empty and comment lines
		[[ -z ${toks} ]] && continue
		[[ ${toke:0:1} == '#' ]] && continue

		deps=( ${toks[*]:2} )
		expand_deps "${toks[0]} ${toks[1]}" "${deps[@]}"
	done < "${input}"
}

build_modules() {
        local name="$1"
        local version="$2"
        local exact_match='no'
        if [[ "${version:0:1}" == "=" ]]; then
                exact_match='yes'
                version="${version:1}"
        fi
        shift 2
        local with_modules=( $* )
        local files
        find_variants_files files

        # if we have to build a dependency, we might have less dependencies
        # on it. Or in other words: the list of "with modules" might be
        # overdetermined. In the loop below we check, which dependencies
        # specified with '--with' are required.
        local m
	local pattern="/^${name}\/${version}[[:blank:]]/"
	for m in "${with_modules[@]}"; do
                if [[ -n $(awk "/${m%/*}[\/ ]/" "${files[@]}") ]]; then
		        pattern+=" && /${m//\//\\/}/"
                fi
	done

        
        local variants=()
        local variants_files=()
        for f in "${files[@]}"; do
                local line=''
                while read line; do
                        variants+=( "${line}" )
                        variants_files+=( "$f" )
                done < <(expand_variants_file "${f}" | awk "${pattern}")
                # here we should add a check, whether the version of the
                # found variants are in the right variants files. Example:
                # a variant for hdf5/1.10.4 is not allowed in a variants file
                # for version 1.8. For this we need the mapping of a variant
                # to the variants file in array 'variants_files'
        done
        if (( ${#variants[@]} == 0 )); then
		std::info "%s " \
			 "${name}/${version}:" \
			 "no suitable variant found!"
                std::die 10 "Aborting..."
        elif (( ${#variants[@]} > 1 )) && [[ ${exact_match} == 'yes' ]]; then
		std::info "%s " \
			 "Multiple variants found:"
                for variant in "${variants[@]}"; do
                        std::info "${variant}"
                done
                std::die 10 "Aborting..."
        fi
        local -i i=0
        local -i num_variants=${#variants[@]}
        for ((i = 0; i < num_variants; i++)); do
                local tokens=( ${variants[i]} )
                local name="${tokens[0]%/*}"
                version="${tokens[0]#*/}"
                release="${tokens[1]}"
                with_modules=( "${tokens[@]:2}" )
                pbuild.build_module \
                        "${name}" "${version}" \
                        "${release}" "${with_modules[@]}"
        done
}

#.............................................................................
# main

parse_args "$@"

if [[ -z "${opt_system}" ]]; then
        opt_system=$(std::get_os_release)
fi

pbuild.jobs "${opt_jobs}"
pbuild.force_rebuild "${opt_force_rebuild}"
pbuild.build_target "${opt_build_target}"
pbuild.dry_run "${opt_dry_run}"
pbuild.enable_cleanup_build "${opt_enable_cleanup_build}"
pbuild.enable_cleanup_src "${opt_enable_cleanup_src}"
pbuild.pmodules_distfilesdir "${opt_distfiles_dir}"
pbuild.update_modulefiles "${opt_update_modulefiles}"
pbuild.temp_dir "${opt_temp_dir}"
pbuild.system "${opt_system}"
pbuild.verbose "${opt_verbose}"

source libpbuild_dyn.bash    || \
        std::die 3 "Oops: cannot source library -- '$_'"

# source build configuration,
# must be done before sourcing libpbuild!
if [[ "${opt_bootstrap}" == 'yes' ]]; then
        test -d "${BUILDBLOCK_DIR}/../../${PMODULES_CONFIG_DIR}" && PATH+=":$_"
else
        # Please note: if we trap DEBUG a statement like
        #              test -d ... && PATH+=$_
        #              does not work (at least on macOS with bash 4 and 5)
        if [[ -d "${PMODULES_ROOT}/${PMODULES_CONFIG_DIR}" ]]; then
                PATH+=":${PMODULES_ROOT}/${PMODULES_CONFIG_DIR}"
        fi
fi
source "${opt_build_config}" || \
        std::die 3 "Oops: Cannot source configuration file -- '$_'"

declare -r BUILD_SCRIPT
declare -r BUILDBLOCK_DIR

# the module name is defined by the directory the build script is in
IFS=/ read -r -a fname <<< "${BUILD_SCRIPT:1}"
module_name=${fname[${#fname[@]}-2]}

#
# are we bootstrapping? If yes, go for it...
#
if [[ "${opt_bootstrap}" == 'yes' ]]; then
	pbuild.bootstrap "${module_name}"  "${versions[0]}" 'stable'
        exit $?
fi

#
# else
#
for version in "${versions[@]}"; do
        build_modules "${module_name}" "${version}" "${opt_with_modules[@]}"
done

# Local Variables:
# mode: sh
# sh-basic-offset: 8
# tab-width: 8
# End: