/* SCROTT - Core System Data Structures
 * ------------------------------------
 *   SQL Database Schema for backend
 */

CREATE DATABASE IF NOT EXISTS `db_scrott`;
USE `db_scrott`;

/* Description of SCROTT object permissions system
 * -----------------------------------------------
 * Every object has an owner, zero or more additional members, and then there is the general
 * public.
 *
 * OWNER  = user OR group
 * MEMBER = user
 *                                                 OWNER        MEMBERS           OTHERS
 * Permissions are:                            ------------------------------------------------
 *  1.  Access object                             GRANTED       GRANTED           MB #6
 *  2.  Modify object                             GRANTED        MB #0           DENIED
 *  3.  Modify members                            GRANTED        MB #1           DENIED
 *  4.  Modify permissions                        GRANTED       DENIED           DENIED
 *  5.  Access sub-objects                        GRANTED        MB #2            MB #7
 *  6.  Create sub-objects                        GRANTED        MB #3            MB #8
 *  7.  Modify sub-objects                        GRANTED        MB #4           DENIED
 *  8.  Modify sub-objects' members               GRANTED        MB #5           DENIED
 *  9.  Modify sub-objects' permissions           GRANTED       DENIED           DENIED
 *
 *                                012345678
 *                            EG: 001111000 = 120 --implies--> that members may access,create,and
 *                                                             fully modify sub-objects. All other
 *                                                             options are DENIED.  This mask value
 *                                                             of 120 is a recommended starting point.
 *
 * Permissions can be overridden down-stream, but permissions will cascade otherwise.
 */

/* Common object structure attributes */
DROP TABLE IF EXISTS `object`;
CREATE TABLE `object` (
    `guid`   varchar(10)          NOT NULL,
    `perms`  int(10)     unsigned NOT NULL DEFAULT 0,
    `owner`  varchar(10)          NOT NULL,
    `parent` varchar(10)      DEFAULT NULL,
    `name`   varchar(50)          NOT NULL,
    `timeCreated` datetime        NOT NULL,
    `timeUpdated` datetime        NOT NULL,
    `type`   enum(
        'user',
        'extern-user',
        'group',
        'pad',
        'stage',
        'issue',
        'message'
    )                             NOT NULL,
    PRIMARY KEY (`guid`)
);

/* Scheme for associating objects with members */
DROP TABLE IF EXISTS `obj_member`;
CREATE TABLE `obj_member` (
    `guid`   varchar(10)          NOT NULL,
    `member` varchar(10)          NOT NULL,
    PRIMARY KEY (`guid`,`member`)
);

/* User objects - special attributes */
/* Notice: 'timeUpdated' field should be used to store the time of the start of the user's current session */
/* Notice: 'key' field is the user's hashed and salted password -- SHA256 */
/* Notice: 'salt' is a random SHA256 output, used as salt for user's password */
DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
    `guid`   varchar(10)          NOT NULL,
    `key`    varchar(64)          NOT NULL,
    `salt`   varchar(64)          NOT NULL,
    `alias`  varchar(50)      DEFAULT NULL,
    `email`  varchar(50)      DEFAULT NULL,
    `emailConf` int(10) unsigned  NOT NULL DEFAULT 0,
    `emailConfKey` varchar(64)    NOT NULL,
    PRIMARY KEY (`guid`)
);

/* Extern-user objects - special attributes */
/* Notice: these objects are contructred on portal pages or if a scrott user gives ownership of an object to an external user. */
/* Notice: This table should be searched for addresses while creating a new normal user object.  If in the event the users email address exists here, it should be promoted to a full user account */
DROP TABLE IF EXISTS `extern-user`;
CREATE TABLE `extern-user` (
    `guid`   varchar(10)          NOT NULL,
    `email`  varchar(50)          NOT NULL,
    `emailConfKey` varchar(64)    NOT NULL,
    PRIMARY KEY (`guid`)
);

/* object type 'group' has no unique attributes */

/* Pad objects - special attributes */
DROP TABLE IF EXISTS `pad`;
CREATE TABLE `pad` (
    `guid`   varchar(10)          NOT NULL,
    `stage`  varchar(10)      DEFAULT NULL,
    `nextIssueNumber` int(10)     NOT NULL DEFAULT 0,
    PRIMARY KEY (`guid`)
);

/* Stage objects - special attributes */
DROP TABLE IF EXISTS `stage`;
CREATE TABLE `stage` (
    `guid`   varchar(10)          NOT NULL,
    `stage`  varchar(10)      DEFAULT NULL,
    PRIMARY KEY (`guid`)
);

/* Issue objects - special attributes */
/* Notice: 'closed' issues should be denoted by being a child of the pad directly, and not the child of a pad's stages */
/* Notice: an issue is 'unread' if the assignee has yet to review the issue.  Self assigned issues, by definition, cannot be in unread state. */
DROP TABLE IF EXISTS `issue`;
CREATE TABLE `issue` (
    `guid`     varchar(10)        NOT NULL,
    `number`   int(10) unsigned   NOT NULL,
    `assignee` varchar(10)    DEFAULT NULL,
    `unread`   int(10) unsigned   NOT NULL DEFAULT 1,
    `desc`     text           DEFAULT NULL,
    PRIMARY KEY (`guid`)
);

/* Message objects - special attributes */
/* Notice: These are discussion messages, comments on issues, and also private messages sent directly to users */
DROP TABLE IF EXISTS `message`;
CREATE TABLE `message` (
    `guid`   varchar(10)          NOT NULL,
    `author` varchar(10)          NOT NULL,
    `unread` int(10) unsigned     NOT NULL DEFAULT 1,
    `message` text            DEFAULT NULL,
    PRIMARY KEY (`guid`)
);