#!/bin/bash
set -e

# This is a library file. 
# It should be 'source'd only, if it is not we bail out here. 
if [[ "$0" = "$BASH_SOURCE" ]]; then
   echo "This file should not be executed directly, it should be 'source'd only. "
   exit 1;
fi

# This file reads a single slug command line option. 
# This is validated when 'require_slug_argument' is called. 

function require_slug_argument() {
    # The 'SLUG' argument must be a valid slug. 
    if ! is_valid_slug "$SLUG"; then
        log_error "Argument 'SLUG' is missing or not a valid slug. ";
        log_info "Please provide it via the command line. ";
        exit 1;
    fi

    log_info " => Deriving configuration for '$SLUG'. "
    if [ ! -n "DISABLE_LOG" ]; then
        echo "Domain Name:          $INSTANCE_DOMAIN"
        echo "Base Directory:       $INSTANCE_BASE_DIR"
        echo "MySQL User:           $MYSQL_USER"
        echo "MySQL Database:       $MYSQL_DATABASE"
        echo "GraphDB User:         $GRAPHDB_USER"
        echo "GraphDB Repository:   $GRAPHDB_REPO"
    fi
}

# Read the slug argument. 
# We also read it in for scripts where it is not required, and will only use it if that is the case. 
SLUG="$1"

# Compute the domain name for this instance.
# Also lowercase the domain name for consistency. 
INSTANCE_DOMAIN="$SLUG.$DEFAULT_DOMAIN"
INSTANCE_DOMAIN="$(echo "$INSTANCE_DOMAIN" | tr '[:upper:]' '[:lower:]')"

# Next we need a username base. 
# This will be used as a username across the system (linux), MySQL and GraphDB. 
# For this we can only allow [0-9a-zA-Z-], hence we have to escape. 
# In most cases, the only characters that require escaping are '.'s. 
# Hence we replace '.' with '-'s.
# We replace the other two characters that require escaping (_ and -)s with --u and --s respectively. 
# Because no two dots can ever follow each other in the INSTANCE_DOMAIN, this is guaranteed collision free. 
# We also have to do the '-' replacement first, to prevent escaped other characters from being escaped twice. 
USERNAME_BASE="$SLUG"
USERNAME_BASE="${USERNAME_BASE//-/--d}"
USERNAME_BASE="${USERNAME_BASE//_/--u}"
USERNAME_BASE="${USERNAME_BASE//./-}"

# Generate the user and database names for the various systems
MYSQL_USER="${MYSQL_USER_PREFIX}${USERNAME_BASE}"
MYSQL_DATABASE="${MYSQL_DATABASE_PREFIX}${USERNAME_BASE}"
GRAPHDB_USER="${GRAPHDB_USER_PREFIX}${USERNAME_BASE}"
GRAPHDB_REPO="${GRAPHDB_REPO_PREFIX}${USERNAME_BASE}"

# Compute the base directory for the files that will live on disk. 
INSTANCE_BASE_DIR="$DEPLOY_INSTANCES_DIR/$INSTANCE_DOMAIN"
INSTANCE_DATA_DIR="$INSTANCE_BASE_DIR/data/"

if [ -n "$CERTBOT_EMAIL" ]; then
    LETSENCRYPT_HOST="$INSTANCE_DOMAIN"
    LETSENCRYPT_EMAIL="$CERTBOT_EMAIL"
fi;