# -*- mode: shell-script -*-

include pretty

export DB_NAME="postgres"
export DB_DATADIR=/var/lib/postgresql/data
export DB_PASSFILE=/root/.pgpass


is_db_locked() {
    is_volume_used "$DATASTORE/${SERVICE_NAME}"
}


_set_db_params() {
    local docker_ip="$1" docker_network="$2"

    export db_docker_opts="--network $docker_network -e PGHOST=$docker_ip -e PGUSER=postgres"
    export db_cmd_opts=
}

ddb () { dcmd psql -qAt "$@"; }


##
## Entrypoints
##


db_drop () {
    local dbname="$1"
    dcmd dropdb --if-exists "$1"
}

db_create () {
    local dbname="$1"
    dcmd createdb "$dbname" || return 1
    info "Database '$dbname' created."
    if [ "$POSTGIS" ]; then
        ddb -d "$dbname" < <(echo "CREATE EXTENSION postgis; CREATE EXTENSION postgis_topology;") || return 1
        dcmd /bin/bash -c "psql -d '$dbname' -f /usr/share/postgresql/*/contrib/postgis-2.1/legacy.sql" || return 1
        info "Installed postgis extensions on database '$dbname'."
    fi
    if [ "$UNACCENT" ]; then
        ddb -d "$dbname" < <(echo "CREATE EXTENSION IF NOT EXISTS unaccent;") || return 1
        info "Installed unaccent extension on database '$dbname'."
    fi
}


## XXXvlab: if launched first, it'll fail handling correctly the open/close of docker
db_has_database() {
    local dbname="$1"
    if [ "$(ddb < <(echo "SELECT 1 FROM pg_database WHERE datname = '$dbname'"))" ]; then
        debug "Database $dbname exists."
        return 0
    else
        debug "Database $dbname exists."
        return 1
    fi
}

## XXXvlab: if launched first, it'll fail handling correctly the open/close of docker
db_has_user() {
    local user="$1" users
    users=$(ddb < <(echo "select u.usename from pg_catalog.pg_user u")) || {
        err "Failed to get user list"
        return 1
    }
    echo "$users" | grep "^${user}$" >/dev/null 2>&1
}

db_create_user() {
    local user="$1" password="$2"
    ## Using this instead of pipes is important so that trap works
    ddb < <(echo "CREATE USER $user WITH PASSWORD '$password' CREATEDB NOCREATEROLE;")
}

db_change_password() {
    local user="$1" password="$2"
    ## Using this instead of pipes is important so that trap works
    ddb < <(echo "ALTER USER $user WITH PASSWORD '$password';")
}


PGM() {
    ensure_db_docker_running </dev/null || return 1

    ## XXXvlab: Here we should have been able to use this, but
    ## pgm requires the ``prefix_pg_local_command=' '`` hack. As
    ## soon this is fixed, we can re
    #dcmd /bin/sh pgm "$@"
    echo docker run -i --rm \
           $db_docker_opts -e prefix_pg_local_command=' ' \
           --entrypoint pgm "$DOCKER_BASE_IMAGE" $db_cmd_opts "$@" >&2

    docker run -i --rm \
           $db_docker_opts -e prefix_pg_local_command=' ' \
           --entrypoint pgm "$DOCKER_BASE_IMAGE" $db_cmd_opts "$@"

}

db_grant_rights () {
    local dbname="$1" user="$2"
    PGM chown "$user" "$dbname"
}