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

include pretty

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


is_db_locked() {
    require lsof || apt-get install -y lsof </dev/null || {
            err "Couldn't install command 'lsof'."
            return 1
        }

    # "$lsof" +D "$host_db_working_dir" || true

    ## We need:
    ##  1- to protect against set -e
    ##  2- to detect if errorlevel 1 because lsof failed for good reason: permissions error, directory not found
    ##  3- to detect if errorlevel 1 because no process found

    [ -d "$host_db_working_dir" ] || {
        err "Directory '$host_db_working_dir' not found. Might be normal at this stage."
        return 1
    }

    ## We choose to ignore (2), and use stdout emptyness to ensure (3)
    open_files=$(lsof +D "$host_db_working_dir") || true

    [ "$open_files" ]
}


_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=

    PGHOST="$docker_ip"
    PGUSER="postgres"
    export PGHOST PGUSER
}


## Must setup a direct connection
_set_up_connection() {

    if [ -e "$DB_PASSFILE" ]; then
        POSTGRES_ROOT_PASSWORD=$(cat "$DB_PASSFILE" | cut -f 5 -d :)
    else
        POSTGRES_ROOT_PASSWORD="$(gen_password)"
    fi

    ##
    ## Setting up access from host
    ##

    debug docker exec -i "$container_id" psql -U postgres -qAt
    docker exec -i "$container_id" psql -U postgres -qAt \
           < <(echo "ALTER USER postgres WITH ENCRYPTED password '$POSTGRES_ROOT_PASSWORD'") || {
        die "direct PSQL injection failed."
    }

    sed -ri 's%^host all all 0\.0\.0\.0/0 trust$%host all all 0.0.0.0/0 md5%g' \
        "$SERVICE_DATASTORE/var/lib/postgresql/data/pg_hba.conf" || return 1

    docker restart "$container_id" || return 1

    ## XXXvlab: this won't help support multiple project running on the
    ## same host
    cat <<EOF > "$DB_PASSFILE"
*:*:*:postgres:$POSTGRES_ROOT_PASSWORD
EOF
    chmod 600 "$DB_PASSFILE" || return 1

}

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';")
}

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

PGM() {
    local src="$1" dst="$2"
    require psql || apt-get install -y postgresql-client </dev/null
    require pgm || {
        (
            cd /opt/apps
            git clone https://github.com/0k/pgm.git
            ln -sf /opt/apps/pgm/bin/* /usr/local/bin/
            apt-get install -y --force-yes pv buffer < /dev/null
            # cd /opt/apps/0k-docker
            # git checkout master
        )
    }

    ensure_db_docker_running </dev/null || return 1

    debug pgm "$@"
    pgm "$@"
}