#!/bin/sh
set -e

# Generate main.cf from template with environment variables
envsubst < /etc/postfix/main.cf.template > /etc/postfix/main.cf

# Generate MySQL virtual alias config from template
envsubst < /etc/postfix/mysql_virtual_alias_maps.cf.template > /etc/postfix/mysql_virtual_alias_maps.cf

# Generate SASL password file from environment variables
envsubst < /etc/postfix/sasl_passwd.template > /etc/postfix/sasl_passwd

# Wait for MySQL to be ready
echo "Waiting for MySQL to be ready..."
for i in $(seq 1 30); do
    if nc -z ${MYSQL_HOST} ${MYSQL_PORT} 2>/dev/null; then
        echo "MySQL is ready!"
        break
    fi
    echo "Waiting for MySQL... ($i/30)"
    sleep 2
done

# Generate Postfix hash databases
postmap /etc/postfix/sasl_passwd
chmod 600 /etc/postfix/sasl_passwd /etc/postfix/sasl_passwd.db

# Regenerate sender_access database
postmap /etc/postfix/sender_access
chmod 644 /etc/postfix/sender_access /etc/postfix/sender_access.db

# Set permissions on MySQL config
chmod 644 /etc/postfix/mysql_virtual_alias_maps.cf

# Configure bounce processing based on environment variable
if [ "${ENABLE_EMAIL_BOUNCE_PROCESSING:-false}" = "true" ]; then
    echo "Email-based bounce processing enabled"
    # Regenerate aliases database to enable bounce processing
    newaliases
    chmod 644 /etc/aliases /etc/aliases.db
    
    # Generate smtp generic maps to ensure bounces come to our bounce address
    postmap /etc/postfix/smtp_generic
    chmod 644 /etc/postfix/smtp_generic /etc/postfix/smtp_generic.db
    echo "Configured return path rewriting to bounces@lists.sasalliance.org"
else
    echo "Email-based bounce processing disabled"
    # Create minimal aliases without bounce processing
    echo "postmaster: root" > /etc/aliases
    echo "root: postmaster" >> /etc/aliases
    newaliases
    
    # Disable smtp generic maps
    echo "# Email bounce processing disabled" > /etc/postfix/smtp_generic
    postmap /etc/postfix/smtp_generic
fi

# Start Postfix in foreground
exec postfix start-fg