#!/bin/bash

function check_service_running() {
    lxc exec "$container" -- bash -c "docker ps --format '{{.Names}},{{.Ports}}' | grep $1 | grep $2"
}

function _read() {
    disable_trace
    check_db_postgres_exists "$longname"
    check_container "$container"
    check_service_running "$longname" "$port"
    enable_trace
    return 0
}

function _create() {
    echo "creating discourse instance for <$shortname> ... "
    echo "initialize discourse $shortname $longname ... OK"

    admin_username=$(load_yaml_from_expanded services[\""$domain"\"][\""$subdomain"\"].data.discourse.admin.username)
    admin_email=$(load_yaml_from_expanded services[\""$domain"\"][\""$subdomain"\"].data.discourse.admin.email)
    admin_password=$(load_yaml_from_expanded services[\""$domain"\"][\""$subdomain"\"].data.discourse.admin.password)
    redis_password=$(load_yaml_from_expanded credential.redis)

    mkdir -p "$MIAOU_CONFIGDIR/apps/discourse"
    APP_REDIS_PASSWORD=$redis_password APP_DOMAIN=$domain APP_SUBDOMAIN=$subdomain APP_FQDN=$fqdn APP_PORT=$port APP_NAME=$longname tera -e --env-key env -t "$MIAOU_BASEDIR/templates/apps/discourse/forum.yml.j2" -o "$MIAOU_CONFIGDIR/apps/discourse/$longname.yml" "$MIAOU_CONFIGDIR/miaou.expanded.yaml"
    echo "creating templates ... OK"

    echo "copying files to container <$container> ... "
    lxc file push --uid 0 --gid 0 "$MIAOU_CONFIGDIR/apps/discourse/$longname.yml" "$container/var/discourse/containers/$longname.yml"
    echo "copying files over container <$container> ... OK"

    if ! (db-psql list | grep -q "$longname"); then
        echo "create empty database <$longname> ... "
        db-psql create "$longname"
        db-psql use "$longname" "CREATE EXTENSION IF NOT EXISTS hstore"
        db-psql use "$longname" "CREATE EXTENSION IF NOT EXISTS pg_trgm"
        echo "create empty database <$longname> ... OK"
    else
        echo "database already exists!"
    fi

    echo "build docker container $longname ..."
    lxc exec "$container" -- bash <<EOF
        set -Eeuo pipefail
        cd /var/discourse
        ./launcher rebuild $longname
        command='u=User.create_with(email: "$admin_email", password: "$admin_password").find_or_initialize_by(username: "$admin_username"); u.save; u.activate'
        ./launcher run $longname "rails runner '\$command'"
EOF
    echo "initialize discourse $longname ... OK"
}

function _update() {
    echo "update"
}

function _delete() {
    echo "delete"
}

function usage() {
    echo "Usage: $COMMAND_NAME -c|r|u|d --port PORT --container CONTAINER --name NAME"
    exit 2
}

### MAIN

# init_strict
source "$(dirname "$0")/../base/common.sh"
COMMAND_NAME=$(basename "$0")

# read the options

TEMP=$(getopt -n "$COMMAND_NAME" -o crud --long port:,container:,name:,fqdn:,domain:,subdomain:,data: -- "$@")
# shellcheck disable=SC2181
[[ "$?" -eq 0 ]] || usage
eval set -- "$TEMP"

action="unset"
port="unset"
container="unset"
shortname="unset"
longname="unset"
fqdn="unset"
domain="unset"
subdomain="unset"

# extract options and their arguments into variables.
while true; do
    case "$1" in
    --port)
        port=$2
        shift 2
        ;;
    --fqdn)
        fqdn=$2
        shift 2
        ;;
    --container)
        container=$2
        shift 2
        ;;
    --name)
        shortname=$2
        longname="discourse-$shortname"
        shift 2
        ;;
    --domain)
        domain=$2
        shift 2
        ;;
    --subdomain)
        subdomain=$2
        shift 2
        ;;
    --data)
        # don't care
        shift 2
        ;;
    -c)
        [[ "$action" == "unset" ]] || usage
        action="_create"
        shift 1
        ;;
    -r)
        [[ "$action" == "unset" ]] || usage
        action="_read"
        shift 1
        ;;
    -u)
        [[ "$action" == "unset" ]] || usage
        action="_update"
        shift 1
        ;;
    -d)
        [[ "$action" == "unset" ]] || usage
        action="_delete"
        shift 1
        ;;
    --)
        shift
        break
        ;;
    *)
        echoerr "Internal error: unrecognized option: <$1>"
        exit 1
        ;;
    esac
done

[[ 
    "$action" != unset &&
    "$port" != unset &&
    "$container" != unset &&
    "$fqdn" != unset &&
    "$domain" != unset &&
    "$subdomain" != unset &&
    "$shortname" != unset ]] || usage

. "$MIAOU_BASEDIR/lib/init.sh"

$action