== Writer Invites a Collaborator to a Story

=== Actor: **Writter**
A writer invites another writer to collaborate on their story, assigning them a role and permission level within the collaboration.

**1.** The writer navigates to their story management page and selects "Manage Collaborators".

**2.** The system displays the current list of collaborators on the story.

{{{#!sql
SELECT u.username, u.name, u.surname, r.roles, p.permission_level
FROM COLLABORATION c
JOIN USERS u ON c.user_id = u.user_id
JOIN ROLES r ON c.user_id = r.user_id AND c.story_id = r.story_id
JOIN PERMISSION_LEVEL p ON c.user_id = p.user_id AND c.story_id = p.story_id
WHERE c.story_id = 5;
}}}

**3.** The writer searches for another writer by username and selects them.

**4.** The writer assigns a role and permission level to the new collaborator.

**5.**  TThe system inserts the new collaborator into the COLLABORATION table.

{{{#!sql
INSERT INTO COLLABORATION (user_id, story_id, created_at)
VALUES (9, 5, CURRENT_TIMESTAMP);
}}}

**6.** The system assigns the role to the collaborator.

{{{#!sql
INSERT INTO ROLES (user_id, story_id, roles)
VALUES (9, 5, 'co-author');
}}}

**7.** The system assigns the permission level to the collaborator.

{{{#!sql
INSERT INTO PERMISSION_LEVEL (user_id, story_id, permission_level)
VALUES (9, 5, 4);
}}}

**8.**The system sends a notification to the invited writer informing them of the collaboration.
{{{#!sql
INSERT INTO NOTIFICATION (content, is_read, created_at)
VALUES ('You have been invited to collaborate on "Letters from Constantinople"', FALSE, CURRENT_TIMESTAMP);
}}}
**9.** The system confirms the collaborator was successfully added.