/**_____________________________________________________________________________
 *
 *                                 OATS - INAF
 *  Osservatorio Astronomico di Tireste - Istituto Nazionale di Astrofisica
 *  Astronomical Observatory of Trieste - National Institute for Astrophysics
 * ____________________________________________________________________________
 *
 * Copyright (C) 2020  Istituto Nazionale di Astrofisica
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation, Inc., 
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 * _____________________________________________________________________________
 **/

/*
    VOSpace front-end
*/

CREATE EXTENSION IF NOT EXISTS ltree;

CREATE TYPE NodeType AS ENUM ('container', 'data', 'link', 'structured');
CREATE TYPE LocationType AS ENUM ('async', 'portal', 'user');
CREATE TYPE StorageType AS ENUM ('cold', 'hot', 'local', 'portal');


CREATE TABLE storage (
    storage_id        SMALLSERIAL   NOT NULL,
    storage_type      StorageType   NOT NULL,
    base_path         VARCHAR       NOT NULL,
    hostname          VARCHAR       NOT NULL,
    PRIMARY KEY (storage_id)
);


CREATE TABLE location (
    location_id       SMALLSERIAL   NOT NULL,
    location_type     LocationType  NOT NULL,
    storage_src_id    SMALLINT      default NULL,
    storage_dest_id   SMALLINT      default NULL,
    PRIMARY KEY (location_id),
    FOREIGN KEY (storage_src_id) REFERENCES storage (storage_id) ON DELETE CASCADE,
    FOREIGN KEY (storage_dest_id) REFERENCES storage (storage_id)
);


CREATE TABLE node (
    node_id                BIGSERIAL     NOT NULL,
    parent_path            LTREE         default NULL,
    parent_relative_path   LTREE         default NULL,
    name                   VARCHAR       NOT NULL,
    os_name                VARCHAR       default NULL,
    tstamp_wrapper_dir     VARCHAR       default NULL,
    type                   NodeType      NOT NULL,
    location_id            SMALLINT      default NULL,
    format                 VARCHAR       default NULL,
    -- format is used to distinguish between unstuctured (format=NULL) and structured nodes having a well defined format
    async_trans            BOOLEAN       default false,
    -- async_trans tells us whether a node is hosted on a cold storage and has to be transferred asynchronously
    sticky                 BOOLEAN       default false,
    busy_state             BOOLEAN       default NULL,
    owner_id               VARCHAR       default NULL,
    creator_id             VARCHAR       default NULL,
    group_read             VARCHAR[]     default NULL,
    group_write            VARCHAR[]     default NULL,
    is_public              BOOLEAN       default NULL,
    delta                  BIGINT        default NULL,
    /* it may be a delta of data which is transferred through an asynchronous transfer.
       It should stay on the transfer service (e.g. Redis) */
    content_type           VARCHAR       default NULL,
    content_encoding       VARCHAR       default NULL,
    content_length         BIGINT        default NULL,
    content_md5            TEXT          default NULL,
    created_on             TIMESTAMP     default CURRENT_TIMESTAMP,
    last_modified          TIMESTAMP     default NULL,
    -- link                  TEXT          default NULL,
    accept_views           TEXT[]        default NULL,
    provide_views          TEXT[]        default NULL,
    -- storage service mapping used to access the content of this node 
    -- storage_id            VARCHAR,    
    protocols              TEXT[]        default NULL,
    PRIMARY KEY (node_id),
    FOREIGN KEY (location_id) REFERENCES location (location_id)
);


CREATE TABLE deleted_node (
    node_id                BIGSERIAL     NOT NULL,
    parent_path            LTREE         default NULL,
    parent_relative_path   LTREE         default NULL,
    name                   VARCHAR       NOT NULL,
    os_name                VARCHAR       default NULL,
    tstamp_wrapper_dir     VARCHAR       default NULL,
    type                   NodeType      NOT NULL,
    location_id            SMALLINT      default NULL,
    format                 VARCHAR       default NULL,
    -- format is used to distinguish between unstuctured (format=NULL) and structured nodes having a well defined format
    async_trans            BOOLEAN       default NULL,
    -- async_trans tells us whether a node is hosted on a cold storage and has to be transferred asynchronously
    sticky                 BOOLEAN       default false,
    busy_state             BOOLEAN       default NULL,
    owner_id               VARCHAR       default NULL,
    creator_id             VARCHAR       default NULL,
    group_read             VARCHAR[]     default NULL,
    group_write            VARCHAR[]     default NULL,
    is_public              BOOLEAN       default NULL,
    delta                  BIGINT        default NULL,
    /* it may be a delta of data which is transferred through an asynchronous transfer.
       It should stay on the transfer service (e.g. Redis) */
    content_type           VARCHAR       default NULL,
    content_encoding       VARCHAR       default NULL,
    content_length         BIGINT        default NULL,
    content_md5            TEXT          default NULL,
    created_on             TIMESTAMP     default NULL,
    last_modified          TIMESTAMP     default NULL,
    -- link                  TEXT          default NULL,
    accept_views           TEXT[]        default NULL,
    provide_views          TEXT[]        default NULL,
    -- storage service mapping used to access the content of this node 
    -- storage_id            VARCHAR,    
    protocols              TEXT[]        default NULL,
    -- add a deleted_on timestamp to keep track
    deleted_on             TIMESTAMP     default CURRENT_TIMESTAMP,
    PRIMARY KEY (node_id),
    FOREIGN KEY (location_id) REFERENCES location (location_id)
);


CREATE TABLE users (
    rap_id            VARCHAR       NOT NULL,
    user_name         VARCHAR       NOT NULL,
    e_mail            VARCHAR       NOT NULL,
    PRIMARY KEY (rap_id)
);