Firestore Collection Structure

1. Users Collection

Collection Name	Document ID	Fields
users	user_id	- username: string - email: string - profile_image: string (URL) - created_at: timestamp

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2. Chats Collection

Collection Name	Document ID	Fields
chats	chat_id	- chat_type: string ('1v1' or 'group') - chat_name: string (for group chats only) - created_by: user_id - created_at: timestamp - participants: array

Participants Array:

Field	Description
user_id	ID of the participant
joined_at	Timestamp of when the user joined

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3. Messages Sub-collection

Collection Name	Document ID	Fields
chats/{chat_id}/messages	message_id	- sender_id: string - content: string - message_type: string ('text', 'image', 'file') - sent_at: timestamp - status: object (per user) - reactions: object (user reactions)

Status Object:

Field	Description
user_id	ID of the participant
status	Message status ('sent', 'delivered', 'read')

Reactions Object:

Field	Description
user_id	ID of the user reacting to the message
emoji_code	Reaction emoji (e.g., 👍, ❤️, 😂)

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4. User Status Collection (Optional for typing/online indicators)

Collection Name	Document ID	Fields
user_status	user_id	- online: boolean - typing_in_chat_id: string - last_active: timestamp