#!/usr/bin/env bash

set -e
set -u
set -o pipefail


############################################################
# Functions
############################################################

###
### Setup Postfix for catch-all
###
set_postfix() {
	local env_varname="${1}"
	local username="${2}"
	local groupname="${3}"
	local php_ini_dir="${4}"
	local php_mail_log="${5}"
	local docker_logs="${6}"
	local debug="${7}"

	local php_ini_file="${php_ini_dir}/devilbox-runtime-sendmail.ini"
	local enable_mail=

	# Verify env value
	if ! env_set "${env_varname}"; then
		log "info" "\$${env_varname} not set." "${debug}"
		log "info" "Postfix will not be started." "${debug}"
		echo "" > "${php_ini_file}"
		return
	fi

	# Retrieve env value
	enable_mail="$( env_get "${env_varname}" )"

	# Enable postfix
	if [ "${enable_mail}" = "1" ] || [ "${enable_mail}" = "2" ]; then

		if [ "${enable_mail}" = "1" ]; then
			log "info" "\$${env_varname} set to 1. Enabling postfix" "${debug}"
		else
			log "info" "\$${env_varname} set to 2. Enabling postfix catch-all" "${debug}"
		fi

		# Configure PHP
		{
			echo "[mail function]";
			echo "sendmail_path = $( command -v sendmail ) -t -i";
			echo ";mail.force_extra_parameters =";
			echo "mail.add_x_header = On";
			echo "mail.log = ${php_mail_log}";
		} > "${php_ini_file}"

		# PHP mail function logs to file
		if [ "${docker_logs}" != "1" ]; then
			# Fix PHP mail log file dir/file and permissions
			if [ ! -d "$( dirname "${php_mail_log}" )" ]; then
				run "mkdir -p $( dirname "${php_mail_log}" )" "${debug}"
			fi
			if [ ! -f "${php_mail_log}" ]; then
				run "touch ${php_mail_log}" "${debug}"
			fi
			run "chown ${username}:${groupname} $( dirname "${php_mail_log}" )" "${debug}"
			run "chown ${username}:${groupname} ${php_mail_log}" "${debug}"
			run "chmod 0644 ${php_mail_log}" "${debug}"
		fi

		# Add Mail dir/file if it does not exist
		if [ ! -d "/var/mail" ]; then
			run "mkdir /var/mail" "${debug}"
		fi
		if [ ! -f "/var/mail/${username}" ]; then
			run "touch /var/mail/${username}" "${debug}"
		fi

		# Fix mail dir/file permissions after mount
		run "chmod 0644 /var/mail/${username}" "${debug}"
		run "chown ${username}:${groupname} /var/mail" "${debug}"
		run "chown ${username}:${groupname} /var/mail/${username}" "${debug}"

		# warning: specify "strict_mailbox_ownership = no" to ignore mailbox ownership mismatch
		run "postconf -e 'strict_mailbox_ownership=no'" "${debug}"

		# Postfix configuration
		run "postconf -e 'inet_protocols=ipv4'" "${debug}"

		# Postfix catch-all
		if [ "${enable_mail}" = "2" ]; then
			run "postconf -e 'virtual_alias_maps=pcre:/etc/postfix/virtual'" "${debug}"
			run "echo '/.*@.*/ ${username}' >> /etc/postfix/virtual" "${debug}"
			run "newaliases" "${debug}"
		fi

	elif [ "${enable_mail}" = "0" ]; then
		log "info" "\$${env_varname} set to 0. Disabling postfix" "${debug}"

	else
		log "err" "Invalid value for \$${env_varname}. Can only be 0, 1 or 2. Prodived: ${enable_mail}" "${debug}"
		exit 1
	fi
}


############################################################
# Sanity Checks
############################################################

if ! command -v sendmail >/dev/null 2>&1; then
	log "err" "sendmail not found, but required." "1"
	exit 1
fi
if ! command -v postconf >/dev/null 2>&1; then
	log "err" "postconf not found, but required." "1"
	exit 1
fi
if ! command -v newaliases >/dev/null 2>&1; then
	log "err" "newaliases not found, but required." "1"
	exit 1
fi