#!/bin/bash

#=================================================
# PACKAGE_CHECK HELPERS
#=================================================

# Start an LXC and execute a command in it
#
# usage: ynh_lxc_pc_exec --name=name --command=command
# | arg: -n, --name=		- name of the LXC
# | arg: -c, --command=		- command to execute
#
# Requires YunoHost version *.*.* or higher.
ynh_lxc_pc_exec () {
	# Declare an array to define the options of this helper.
	local legacy_args=nc
	local -A args_array=([n]=name= [c]=command=)
	local name
	local command
	# Manage arguments with getopts
	ynh_handle_getopts_args "$@"

	_ynh_lxc_start_and_wait $name

	start_timer

	# Execute the command given in argument in the container and log its results.
	lxc exec $name --env PACKAGE_CHECK_EXEC=1 -t -- /bin/bash -c "$command" | tee -a "$complete_log" $current_test_log

	# Store the return code of the command
	local returncode=${PIPESTATUS[0]}

	log_debug "Return code: $returncode"

	stop_timer 1
	# Return the exit code of the ssh command
	return $returncode
}

# Create a witness in an LXC container
#
# usage: ynh_lxc_pc_witness_file_create --name=name --witness=witness --type=type
# | arg: -n, --name=		- name of the LXC
# | arg: -w, --witness=		- witness to create
# | arg: -t, --type=		- type of witness, can be file or directory
#
# Requires YunoHost version *.*.* or higher.
ynh_lxc_pc_witness_file_create () {
	# Declare an array to define the options of this helper.
	local legacy_args=nwt
	local -A args_array=([n]=name= [w]=witness= [t]=type=)
	local name
	local witness
	local type
	# Manage arguments with getopts
	ynh_handle_getopts_args "$@"

	[ "$type" = "file" ] && local action="touch" || local action="mkdir -p"
	ynh_lxc_run_inside --name=$name --command="$action $witness"
}

ynh_lxc_pc_witness_files_set () {
	# Create files to check if the remove script does not remove them accidentally
	log_debug "Create witness files..."

	# Nginx conf
	ynh_lxc_pc_witness_file_create --name=$LXC_NAME --witness="/etc/nginx/conf.d/$DOMAIN.d/witnessfile.conf" --type=file
	ynh_lxc_pc_witness_file_create --name=$LXC_NAME --witness="/etc/nginx/conf.d/$SUBDOMAIN.d/witnessfile.conf" --type=file

	# /etc
	ynh_lxc_pc_witness_file_create --name=$LXC_NAME --witness="/etc/witnessfile" --type=file

	# /opt directory
	ynh_lxc_pc_witness_file_create --name=$LXC_NAME --witness="/opt/witnessdir" --type=directory

	# /var/www directory
	ynh_lxc_pc_witness_file_create --name=$LXC_NAME --witness="/var/www/witnessdir" --type=directory

	# /home/yunohost.app/
	ynh_lxc_pc_witness_file_create --name=$LXC_NAME --witness="/home/yunohost.app/witnessdir" --type=directory

	# /var/log
	ynh_lxc_pc_witness_file_create --name=$LXC_NAME --witness="/var/log/witnessfile" --type=file

	# Config fpm
	ynh_lxc_pc_witness_file_create --name=$LXC_NAME --witness="/etc/php/$DEFAULT_PHP_VERSION/fpm/pool.d/witnessfile.conf" --type=file

	# Config logrotate
	ynh_lxc_pc_witness_file_create --name=$LXC_NAME --witness="/etc/logrotate.d/witnessfile" --type=file

	# Config systemd
	ynh_lxc_pc_witness_file_create --name=$LXC_NAME --witness="/etc/systemd/system/witnessfile.service" --type=file

	# Database
	ynh_lxc_run_inside --name=$LXC_NAME --command="mysqladmin --wait status > /dev/null 2>&1"
	echo "CREATE DATABASE witnessdb" | ynh_lxc_run_inside --name=$LXC_NAME --command="mysql --wait > /dev/null 2>&1"
}

ynh_lxc_pc_witness_file_check () {
	if ynh_lxc_run_inside --name=$LXC_NAME --command="test ! -e \"$1\""
	then
		log_error "The file $1 is missing ! Something gone wrong !"
		SET_RESULT "failure" witness
	fi
}

ynh_lxc_pc_witness_files_check () {
	# Check all the witness files, to verify if them still here

	# Nginx conf
	ynh_lxc_pc_witness_file_check "/etc/nginx/conf.d/$DOMAIN.d/witnessfile.conf"
	ynh_lxc_pc_witness_file_check "/etc/nginx/conf.d/$SUBDOMAIN.d/witnessfile.conf"

	# /etc
	ynh_lxc_pc_witness_file_check "/etc/witnessfile"

	# /opt directory
	ynh_lxc_pc_witness_file_check "/opt/witnessdir"

	# /var/www directory
	ynh_lxc_pc_witness_file_check "/var/www/witnessdir"

	# /home/yunohost.app/
	ynh_lxc_pc_witness_file_check "/home/yunohost.app/witnessdir"

	# /var/log
	ynh_lxc_pc_witness_file_check "/var/log/witnessfile"

	# Config fpm
	ynh_lxc_pc_witness_file_check "/etc/php/$DEFAULT_PHP_VERSION/fpm/pool.d/witnessfile.conf"

	# Config logrotate
	ynh_lxc_pc_witness_file_check "/etc/logrotate.d/witnessfile"

	# Config systemd
	ynh_lxc_pc_witness_file_check "/etc/systemd/system/witnessfile.service"

	# Database
	if ! ynh_lxc_run_inside --name=$LXC_NAME --command="mysqlshow witnessdb > /dev/null 2>&1"
	then
		log_error "The database witnessdb is missing ! Something gone wrong !"
		SET_RESULT "failure" witness
		return 1
	fi
}

ynh_lxc_pc_create () {
	log_info "Launching new LXC $LXC_NAME ..."
	# Check if we can launch container from YunoHost remote image
	if lxc remote list | grep -q "yunohost" && lxc image list yunohost:$LXC_BASE | grep -q -w $LXC_BASE; then
		lxc launch yunohost:$LXC_BASE $LXC_NAME \
			-c security.nesting=true \
			-c security.privileged=true \
			-c limits.memory=80% \
			-c limits.cpu.allowance=80% \
			>>/proc/self/fd/3
	# Check if we can launch container from a local image
	elif lxc image list $LXC_BASE | grep -q -w $LXC_BASE; then
		lxc launch $LXC_BASE $LXC_NAME \
			-c security.nesting=true \
			-c security.privileged=true \
			-c limits.memory=80% \
			-c limits.cpu.allowance=80% \
			>>/proc/self/fd/3
	else
		log_critical "Can't find base image $LXC_BASE, run ./package_check.sh --rebuild"
	fi
	
	pipestatus="${PIPESTATUS[0]}"
	location=$(lxc list --format json | jq -e --arg LXC_NAME $LXC_NAME '.[] | select(.name==$LXC_NAME) | .location' | tr -d '"')
	[[ "$location" != "none" ]] && log_info "... on $location"

	[[ "$pipestatus" -eq 0 ]] || exit 1

	_ynh_lxc_start_and_wait $LXC_NAME
	ynh_lxc_pc_witness_files_set
	lxc snapshot $LXC_NAME snap0
}

ynh_lxc_pc_snapshot_create () {
	# Create a temporary snapshot

	local snapname=$1

	start_timer

	# Check all the witness files, to verify if them still here
	ynh_lxc_pc_witness_files_check >&2

	# Remove swap files to avoid killing the CI with huge snapshots.
	ynh_lxc_swapfiles_clean
	
	ynh_lxc_stop $LXC_NAME

	# Check if the snapshot already exist
	if ! ynh_lxc_snapshot_exists "$snapname"
	then
		log_info "(Creating snapshot $snapname ...)"
		lxc snapshot $LXC_NAME $snapname
	fi

	_ynh_lxc_start_and_wait $LXC_NAME

	stop_timer 1
}