#!/usr/bin/env bash

# set -o errexit


## Colors
readonly COLOR_RED='\033[0;31m'
readonly COLOR_GREEN='\033[0;32m'
readonly COLOR_YELLOW='\033[0;33m'
readonly COLOR_BLUE='\033[0;34m'
readonly COLOR_PURPLE='\033[1;35m'
readonly COLOR_RESET='\033[0m'


RETURNCODE_SUCCESS=0
RETURNCODE_ERROR=1

DEFAULT_PYTHON_PATH='/usr/bin/python3'
PYTHON_PATH=''
readonly LOG_LEVEL_ERROR=0
readonly LOG_LEVEL_WARNING=1
readonly LOG_LEVEL_INFO=2
readonly LOG_LEVEL_DEBUG=3
LOG_LEVEL=$LOG_LEVEL_DEBUG

log()
{
	local log_type="$1"  # 'debug', 'info', 'warning' or 'error'
	local message="$2"
	local message_color=''
	local message_level=''
	case "$log_type" in
		'error')
			message_color="$COLOR_RED"
			message_level="$LOG_LEVEL_ERROR"
			;;
		'warning')
			message_color="$COLOR_YELLOW"
			message_level="$LOG_LEVEL_WARNING"
			;;
		'info')
			message_color="$COLOR_BLUE"
			message_level="$LOG_LEVEL_INFO"
			;;
		'debug')
			message_color="$COLOR_PURPLE"
			message_level="$LOG_LEVEL_DEBUG"
			;;
		*)
			echo "unexpected log type $log_type"
			exit "$RETURNCODE_ERROR"
	esac

	if [ "$message_level" -le "$LOG_LEVEL" ]
	then
		printf "%b : %s\n" "${message_color}${log_type}${COLOR_RESET}" "$message"
	fi
}

replace_in_file()
{
	local file_path="$1"
	local searched_string="$2"
	local replacement_string="$3"

	log 'debug' "replacing ${searched_string} with ${replacement_string} in $file_path"


	local safe_searched_string=$(echo "$searched_string" | tr '"' '\"' | tr '$' '\$')
	local safe_replacement_string=$(echo "$replacement_string" | tr '"' '\"' | tr '$' '\$')
	# log 'debug' "safe_searched_string : $safe_searched_string"

	printf 'safe_searched_string: %b\n' "$safe_searched_string" 

	grep -q "$safe_searched_string" "$file_path"
	if [ $? != "$RETURNCODE_SUCCESS" ]
	then
		log 'error' "failed to find $safe_searched_string in $file_path"
		return $RETURNCODE_ERROR
	fi

	# log 'debug' "searching a separator"

	local sep=''
	for sep in '/' '|' '@'
	do
		if $(echo "$safe_searched_string" | grep -q "$sep") || $(echo "$safe_replacement_string" | grep -q "$sep")
		then
			sep=''
		else
			# found a suitable separator for use in sed
			log 'debug' "found separator: $sep"
			break
		fi
	done


	if [ "$sep" = '' ]
	then
		log 'error' "failed to find a sed separator suitable for $safe_searched_string and $safe_replacement_string"
	fi
	sed -i "s${sep}${safe_searched_string}${sep}${safe_replacement_string}${sep}" "$file_path"

	grep -q "$safe_replacement_string" "$file_path"
	if [ $? != "$RETURNCODE_SUCCESS" ]
	then
		log 'error' "failed to find $safe_replacement_string in $file_path"
		return $RETURNCODE_ERROR
	fi
}

is_version_greater_than()
{
	
	first_value="${1}"
	value_to_compare="${2}"

	## Return False by default
	return_is_version_greater_than="1"
	
	log 'debug' "is_version_greater_than - Is first value (${first_value}) greater than the second value (${value_to_compare})."
	
	if printf '%s\n' "${first_value}" "${value_to_compare}" | sort --check=quiet --version-sort; then
		log 'debug' "${debug_prefix}is_version_greater_than - ${first_value} <= ${value_to_compare} ."
		return_is_version_greater_than="1"
	else
		log 'debug' "${debug_prefix}is_version_greater_than - ${first_value} > ${value_to_compare} ."
		return_is_version_greater_than="0"
	fi

	unset first_value
	unset value_to_compare

	return "${return_is_version_greater_than}"
}


controller__get_local_repos_path()
{
	local debops_controller_path="$1"
	echo "${debops_controller_path}/ansible.debops.git"
}

controller__get_reports_path()
{
	local debops_controller_path="$1"
	echo "${debops_controller_path}/reports"
}

controller__get_virtualenv_path()
{
	local debops_controller_path="$1"
	echo "${debops_controller_path}/debops.venv"
}


controller__get_debops_env_path()
{
	local debops_controller_path="$1"
	echo "${debops_controller_path}/debops-environment"
}

deboco__init()
{
	local debops_controller_path="$1"
	log 'info' "creating debobs controller in $debops_controller_path"
	if [ "$debops_controller_path" = '' ]
	then
		log 'error' "wrong debops controller path: $debops_controller_path"
		return "$RETURNCODE_ERROR"
	fi
	if [ -d "$debops_controller_path" ]
	then
		log 'error' "$debops_controller_path already exists"
		return "$RETURNCODE_ERROR"
	fi
	local local_repos_path=$(controller__get_local_repos_path "$debops_controller_path")
	local ipr_debops_url='https://git.ipr.univ-rennes.fr/cellinfo/ansible.debops'
	log 'info' "cloning $ipr_debops_url into $local_repos_path"
	git clone https://git.ipr.univ-rennes.fr/cellinfo/ansible.debops "$local_repos_path"

	local debops_env_path=$(controller__get_debops_env_path "$debops_controller_path")

	local debops_update_script_path="$local_repos_path/bin/update-debops.sh"

	local from_line='readonly DEBOPS_ENVIRONMENT_FILE="${HOME}/.config/debops/environment"'
	# local from_line='readonly DEBOPS_ENVIRONMENT_FILE'
	local to_line="readonly DEBOPS_ENVIRONMENT_FILE=${debops_env_path}"
	log 'info' "replacing  $from_line with $to_line in $debops_update_script_path so that the script uses a debops environment specific to this controller"
	replace_in_file "$debops_update_script_path" "$from_line" "$to_line"
	if [ $? != "$RETURNCODE_SUCCESS" ]
	then
		return $RETURNCODE_ERROR
	fi

	local bug_3678_is_fixed='false'
	if [ "$bug_3678_is_fixed" = 'false' ]
	then
		log 'warning' "disabling pip update in $debops_update_script_path because of https://bugzilla.ipr.univ-rennes.fr/show_bug.cgi?id=3678"
		replace_in_file "$debops_update_script_path" \
			'python -m pip install --quiet --requirement "${PIP_PKG_LIST}" --upgrade' \
			'# python -m pip install --quiet --requirement "${PIP_PKG_LIST}" --upgrade'
		if [ $? != "$RETURNCODE_SUCCESS" ]
		then
			return $RETURNCODE_ERROR
		fi

		replace_in_file "$debops_update_script_path" \
			'|| error_message "Error with pip packages upgrade ' \
			'# || error_message "Error with pip packages upgrade '
		if [ $? != "$RETURNCODE_SUCCESS" ]
		then
			return $RETURNCODE_ERROR
		fi
	fi

	local bug_3715_is_fixed='false'
	if [ "$bug_3715_is_fixed" = 'false' ]
	then
		# make sure that the python version is at least 3.10 so that ansible>=2.15 is installed (as debops 3.1 requires ansible>=2.15)
		local python_version=$(${PYTHON_PATH} --version | cut --delimiter=" " --fields=2 --)
		log 'debug' "python_version=$python_version"

		if is_version_greater_than "3.10" "${python_version}"
		then
			log 'error' "debops only works with python version 3.10 or more, and your version of python is $python_version"
			return $RETURNCODE_ERROR
		fi

		replace_in_file "$debops_update_script_path" \
			'virtualenv --quiet -- ' \
			"${PYTHON_PATH} -m venv "
		if [ $? != "$RETURNCODE_SUCCESS" ]
		then
			return $RETURNCODE_ERROR
		fi
	fi


	local virtual_env_path=$(controller__get_virtualenv_path "$debops_controller_path")
	# no need to call update-debops.sh since update-dev.sh does it
	DEBOPS_VENV="$virtual_env_path" "$local_repos_path/bin/update-dev.sh"
}

deboco__update()
{
	local debops_controller_path="$1"
	log 'info' "updating debobs controller in $debops_controller_path"

	reports_path="$(controller__get_reports_path "$debops_controller_path")"
	mkdir -p "${reports_path}"
	report_file_path=${reports_path}/$(date --iso=seconds)-init-${target_host_fqdn}

	local local_repos_path=$(controller__get_local_repos_path "$debops_controller_path")
	local virtual_env_path=$(controller__get_virtualenv_path "$debops_controller_path")

	log info "updating repository $local_repos_path"
	pushd "$local_repos_path"
		git pull | tee --append ${report_file_path}
	popd

	log info "updating debops itself in $virtual_env_path"
	DEBOPS_VENV="$virtual_env_path" "$local_repos_path/bin/update-dev.sh" | tee --append ${report_file_path}
}

deboco__configure_machine()
{
	local debops_controller_path="$1"
	local target_host_fqdn="$2"  # the machine on which we want to install debops bootstrap, eg alambix-108.ipr.univ-rennes.fr
	log 'info' "configuring $target_host_fqdn using debobs controller $debops_controller_path"

	local error_code=$RETURNCODE_SUCCESS

	deboco__init_machine "$debops_controller_path" "$target_host_fqdn"
	if [ $? = 0 ]
	then
		deboco__update_machine "$debops_controller_path" "$target_host_fqdn"
		if [ $? != 0 ]
		then
			log 'error' "update_machine failed"
			error_code=$RETURNCODE_ERROR
		fi
	else
		log 'error' "init_machine failed"
		error_code=$RETURNCODE_ERROR
	fi

	return "$error_code"
}


deboco__init_machine()
{
	local debops_controller_path="$1"
	local target_host_fqdn="$2"  # the machine on which we want to install debops bootstrap, eg alambix-108.ipr.univ-rennes.fr
	log 'info' "installing debops bootstrap on $target_host_fqdn using debobs controller $debops_controller_path"

	local error_code=$RETURNCODE_SUCCESS

	reports_path="$(controller__get_reports_path "$debops_controller_path")"
	mkdir -p "${reports_path}"
	report_file_path=${reports_path}/$(date --iso=seconds)-init-${target_host_fqdn}
	echo "installing debops bootstrap on ${target_host_fqdn} (report stored in ${report_file_path})"

	local local_repos_path=$(controller__get_local_repos_path "$debops_controller_path")
	local virtual_env_path=$(controller__get_virtualenv_path "$debops_controller_path")
	local debops_exit_code=''
	pushd "$local_repos_path"
		source "$virtual_env_path/bin/activate"
		ANS_HOST=$(echo ${target_host_fqdn} | sed -E 's/\.univ-rennes[1]?\.fr$//')
		log 'debug' "ANS_HOST=${ANS_HOST}"
		debops run bootstrap-ldap -l "${ANS_HOST:-/dev/null}" | tee --append ${report_file_path}
		debops_exit_code=$?
		echo "return code for debops run bootstrap-ldap -l ${ANS_HOST:-/dev/null} : $debops_exit_code" >> "${report_file_path}"
		log 'debug' "debops_exit_code=$debops_exit_code"
		if [ "$debops_exit_code" != "$RETURNCODE_SUCCESS" ]
		then
			log 'error' 'debops run bootstrap-ldap failed'
			error_code="$RETURNCODE_ERROR"
		fi
		deactivate
	popd
	return "$error_code"
}

deboco__update_machine()
{
	local debops_controller_path="$1"
	local target_host_fqdn="$2"  # eg alambix-108.ipr.univ-rennes.fr
	log 'info' "updating $target_host_fqdn using debobs controller $debops_controller_path"

	local error_code=$RETURNCODE_SUCCESS

	reports_path="$(controller__get_reports_path "$debops_controller_path")"
	mkdir -p "${reports_path}"
	report_file_path=${reports_path}/$(date --iso=seconds)-update-${target_host_fqdn}
	echo "applying debops configuration on ${target_host_fqdn} (report stored in ${report_file_path})"

	local local_repos_path=$(controller__get_local_repos_path "$debops_controller_path")
	local virtual_env_path=$(controller__get_virtualenv_path "$debops_controller_path")
	local debops_exit_code=''
	log 'debug' "local_repos_path=$local_repos_path"

	pushd "$local_repos_path"
		source "$virtual_env_path/bin/activate"
		ANS_HOST=$(echo ${target_host_fqdn} | sed -E 's/\.univ-rennes[1]?\.fr$//')
		log 'debug' "ANS_HOST=${ANS_HOST}"
		debops run site --limit "${ANS_HOST:-/dev/null}" | tee --append ${report_file_path}
		debops_exit_code=$?
		echo "return code for debops run site --limit ${ANS_HOST:-/dev/null} : $debops_exit_code" >> "${report_file_path}"
		if [ "$debops_exit_code" != "$RETURNCODE_SUCCESS" ]
		then
			log 'error' 'debops run site failed'
			error_code="$RETURNCODE_ERROR"
		fi
		deactivate
	popd
	return "$error_code"
}

deboco_print_usage()
{
	echo "$0 performs a debops controller operation"
	echo 
	echo "usage:"
	echo " $0 [options] <command>"
	echo 
	echo "where:"
	echo "  [options] is a set of:"
	echo "     --python-path <python-path>"
	echo "        specifies the python executable to use (must be python 3.10 or above). Default is $DEFAULT_PYTHON_PATH"
	echo 
	echo "  <command> is one of:"
	echo "     init <debobs-controller-path>"
	echo "        creates a debops controller in <debobs-controller-path>"
	echo 
	echo "     update <debobs-controller-path>"
	echo "        updates the debops controller in <debobs-controller-path>"
	echo 
	echo "     init_machine <debobs-controller-path> <machine-fqdn>"
	echo "        installs debops bootstrap on the machine <machine-fqdn> using the debops controller in <debobs-controller-path>"
	echo 
	echo "     update_machine <debobs-controller-path> <machine-fqdn>"
	echo "        updates the machine <machine-fqdn> using the debops controller in <debobs-controller-path>"
	echo 
	echo "     configure_machine <debobs-controller-path> <machine-fqdn>"
	echo "        configures the machine <machine-fqdn> using the debops controller in <debobs-controller-path>". Equivivalent to a init_machine followed by update_machine
	echo 
	echo "example:"
	echo "     deboco --python-path /usr/bin/python3.10 init ~/work/debops/constrollers/alambix"
}

deboco()
{
	PYTHON_PATH="$DEFAULT_PYTHON_PATH"
	while true
	do
		local arg="$1"
		shift
		if [ "$arg" = '--python-path' ]
		then
			PYTHON_PATH="$1"
			shift
		elif type "deboco__${arg}" >/dev/null 2>&1
		then
			"deboco__${arg}" "$@"
			return $?
		else
			log 'error' "unhandled argument: ${arg}"
			deboco_print_usage
			return "$RETURNCODE_ERROR"
		fi
	done
}


deboco $@