CREATE TABLE users (
  id uuid PRIMARY KEY DEFAULT uuid_generate_v4(),

  created_at timestamptz NOT NULL DEFAULT clock_timestamp(),
  modified_at timestamptz NOT NULL DEFAULT clock_timestamp(),
  deleted_at timestamptz NULL,

  fullname text NOT NULL DEFAULT '',
  email text NOT NULL,
  photo text NOT NULL,
  password text NOT NULL,

  lang text NULL,
  is_demo boolean NOT NULL DEFAULT false
);

CREATE UNIQUE INDEX users__email__idx
    ON users (email)
 WHERE deleted_at IS null;

CREATE INDEX users__is_demo
    ON users (is_demo)
 WHERE deleted_at IS null
   AND is_demo IS true;

--- Table used for register all used emails by the user
CREATE TABLE user_emails (
  user_id uuid NOT NULL REFERENCES users(id) ON DELETE CASCADE,

  created_at timestamptz NOT NULL DEFAULT clock_timestamp(),
  verified_at timestamptz NULL DEFAULT NULL,

  email text NOT NULL,

  is_main boolean NOT NULL DEFAULT false,
  is_verified boolean NOT NULL DEFAULT false
);

CREATE INDEX user_emails__user_id__idx
    ON user_emails (user_id);

--- Table for user key value attributes

CREATE TABLE user_attrs (
  user_id uuid NOT NULL REFERENCES users(id) ON DELETE CASCADE,

  created_at timestamptz NOT NULL DEFAULT clock_timestamp(),
  modified_at timestamptz NOT NULL DEFAULT clock_timestamp(),

  key text NOT NULL,
  val bytea NOT NULL,

  PRIMARY KEY (key, user_id)
);

--- Table for store verification tokens

CREATE TABLE tokens (
  user_id uuid NOT NULL REFERENCES users(id) ON DELETE CASCADE,
  token text NOT NULL,

  created_at timestamptz NOT NULL DEFAULT clock_timestamp(),
  used_at timestamptz NULL,

  PRIMARY KEY (token, user_id)
);

--- Table for store user sessions.

CREATE TABLE sessions (
  id uuid PRIMARY KEY DEFAULT uuid_generate_v4(),

  created_at timestamptz NOT NULL DEFAULT clock_timestamp(),
  modified_at timestamptz NOT NULL DEFAULT clock_timestamp(),

  user_id uuid REFERENCES users(id) ON DELETE CASCADE,
  user_agent text NULL
);

CREATE INDEX sessions__user_id__idx
    ON sessions (user_id);

-- Insert a placeholder system user.

INSERT INTO users (id, fullname, email, photo, password)
VALUES ('00000000-0000-0000-0000-000000000000'::uuid,
        'System User',
        'system@uxbox.io',
        '',
        '!');

--- Triggers

CREATE TRIGGER users__modified_at__tgr
BEFORE UPDATE ON users
   FOR EACH ROW EXECUTE PROCEDURE update_modified_at();

CREATE TRIGGER user_attrs__modified_at__tgr
BEFORE UPDATE ON user_attrs
   FOR EACH ROW EXECUTE PROCEDURE update_modified_at();