#! /usr/bin/env sh

if [ -n "${SMTP_HOST_FILE}" ]; then
    SMTP_HOST=$(cat ${SMTP_HOST_FILE});
fi

if [ -n "${SMTP_PORT_FILE}" ]; then
    SMTP_PORT=$(cat ${SMTP_PORT_FILE});
fi

if [ -n "${SMTP_FROM_FILE}" ]; then
    SMTP_FROM=$(cat ${SMTP_FROM_FILE});
fi

if [ -n "${SMTP_USER_FILE}" ]; then
    SMTP_USER=$(cat ${SMTP_USER_FILE});
fi

if [ -n "${SMTP_PASSWORD_FILE}" ]; then
    SMTP_PASSWORD=$(cat ${SMTP_PASSWORD_FILE});
fi

IFS=

if [ -n "${EMAIL_FILE}" ]; then
    EMAIL=$(cat ${EMAIL_FILE});
else
    if [ -z "${EMAIL}" ]; then
        EMAIL="To: ${TO_ADDRESSES}\nSubject: ${SUBJECT}\n\n${MESSAGE}";
    fi
fi

if [ -z "${MSMTP_CONFIG_FILE}" ]; then
    MSMTP_CONFIG_FILE=~/.msmtprc
    touch ${MSMTP_CONFIG_FILE}
    chmod 600 ${MSMTP_CONFIG_FILE}
    echo "defaults
    auth ${SMTP_AUTH:-on}
    tls ${SMTP_TLS:-on}

    account default
    host ${SMTP_HOST}
    port ${SMTP_PORT:-587}
    tls_starttls ${SMTP_STARTTLS:-on}
    from ${SMTP_FROM}
    user ${SMTP_USER}
    password ${SMTP_PASSWORD}" > ${MSMTP_CONFIG_FILE}
fi

echo -e "${EMAIL}" | msmtp --read-recipients -C ${MSMTP_CONFIG_FILE}