# Feature Specifications

This document outlines the features and requirements for the Drinks Inventory System.

## Core Features

### 1. Drink Type Management

#### Description
Allow users to manage different types of drinks in the inventory system.

#### User Stories
- As a user, I want to add a new type of drink to the system
- As a user, I want to edit existing drink types
- As a user, I want to view a list of all drink types
- As a user, I want to specify the desired amount of crates for each drink type

#### Acceptance Criteria
- Users can create new drink types with the following information:
  - Name
  - Description (optional)
  - Desired stock level (in crates)
- Users can edit existing drink types
- Users can view a list of all drink types with their current and desired stock levels
- The system validates that drink names are unique

### 2. Inventory Management

#### Description
Allow users to manage the current inventory of drinks.

#### User Stories
- As a user, I want to update the current stock level of a drink
- As a user, I want to view the current stock levels of all drinks
- As a user, I want to see the history of stock changes for each drink

#### Acceptance Criteria
- Users can update the current stock level of a drink
- The system records each stock update with a timestamp
- Users can view a history of stock changes for each drink
- The system displays the difference between current and desired stock levels

### 3. Order Management

#### Description
Allow users to create and manage orders for drinks.

#### User Stories
- As a user, I want the system to automatically calculate how much of each drink to order
- As a user, I want to create a new order
- As a user, I want to update the status of an order
- As a user, I want to view all orders and their statuses

#### Acceptance Criteria
- The system automatically calculates order quantities based on:
  - Current stock levels
  - Desired stock levels
- Users can create new orders with the following states:
  - New
  - In Work
  - Ordered
  - Fulfilled
- Users can update the status of an order
- Users can view all orders with their details and current status

### 4. Adaptive Stock Level Adjustment

#### Description
The system should automatically adjust desired stock levels based on consumption patterns.

#### User Stories
- As a user, I want the system to automatically adjust desired stock levels based on consumption patterns
- As a user, I want to configure the parameters for automatic stock level adjustments

#### Acceptance Criteria
- The system analyzes consumption patterns when a new order is created
- If a drink is consistently overstocked at order time, the system decreases its desired stock level
- If a drink is consistently understocked at order time, the system increases its desired stock level
- Users can configure the parameters for these adjustments, including:
  - Adjustment frequency
  - Adjustment magnitude
  - Threshold for triggering adjustments

## User Interface Requirements

### General UI Requirements
- Simple, intuitive interface
- Mobile-friendly design
- Clear visual indicators for stock levels (e.g., color coding for low stock)
- Responsive design for use on different devices

### Main Views
1. **Dashboard**
   - Overview of current stock levels
   - Alerts for low stock items
   - Quick update form to update current stock levels
   - Quick access to create new orders

2. **Drink Types Management**
   - List of all drink types
   - Form for adding/editing drink types
   - Display of current and desired stock levels

3. **Inventory Management**
   - Interface for updating current stock levels
   - History of stock changes
   - Stock level trends over time

4. **Order Management**
   - List of all orders with their statuses
   - Interface for creating new orders
   - Interface for updating order statuses

5. **Settings**
   - Configuration for automatic stock level adjustments
   - System preferences

## Non-Functional Requirements

### Performance
- Page load times should be under 2 seconds
- Database queries should be optimized for performance

### Usability
- The system should be usable without training
- Forms should include validation and helpful error messages
- The interface should be accessible

### Security
- The system will be used internally without login
- Input validation to prevent SQL injection and other attacks

### Reliability
- The system should handle concurrent users
- Data should be backed up regularly