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DESIGN.md

Overview

This document outlines the design for a cross-platform (iOS & Android) mobile e-commerce application named "ecommerce_flutter". The application will be developed using the Flutter framework and will feature a clean, minimalist, and intuitive user interface. The core functionality will include product discovery, browsing, a secure checkout process, user account management, and an innovative "Virtual Try-On" feature powered by the Gemini API.

Detailed Analysis of the Goal or Problem

The primary goal is to create a seamless and engaging shopping experience. The application will address the entire customer journey:

  • Product Discovery: Users will be able to discover products through a curated home screen, category browsing, and search functionality.
  • Product Evaluation: A detailed product screen will provide comprehensive information, including images, descriptions, pricing, and user reviews.
  • Virtual Try-On: A key feature will allow users to upload a photo of themselves and "try on" clothing items virtually. This will be achieved by sending the user's photo and the product image to a Gemini API endpoint, which will return a new image of the user wearing the selected apparel.
  • Shopping Cart: A persistent shopping cart will allow users to add and manage items they intend to purchase.
  • Checkout: A secure and streamlined multi-step checkout process will guide the user through shipping, payment, and order confirmation.
  • User Accounts: Users will be able to create accounts, manage their profiles, view order history, and save their favorite items.

Alternatives Considered

We considered three main navigation models:

  1. Simple & Direct: A single product list, best for very small catalogs.
  2. Standard Tab-Based: A common and intuitive approach with a bottom navigation bar for Home, Shop, Cart, and Profile.
  3. Discovery-Focused: A personalized feed-style interface, ideal for very large and dynamic product catalogs.

We have chosen Option 2, the Standard Tab-Based model, as it provides a robust and familiar structure that can accommodate the planned features and scale for future growth.

Detailed Design

Architecture

We will follow a feature-based architecture with a clear separation of concerns into three main layers: Data, Domain, and Presentation.

  • Data Layer: Responsible for data retrieval and storage. It will include repositories that abstract data sources (REST API, local database).
  • Domain Layer: Contains the core business logic, use cases (e.g., AddToCart, ProcessPayment), and domain models (e.g., Product, User). This layer will be independent of the UI and data sources.
  • Presentation Layer: The UI of the application, built with Flutter widgets. We will use the BLoC (Business Logic Component) pattern for state management, ensuring a reactive and predictable UI.

Folder Structure

ecommerce_flutter/
├── lib/
│   ├── main.dart
│   ├── core/
│   │   ├── config/           # App configuration, constants
│   │   ├── di/               # Dependency injection setup
│   │   ├── navigation/       # Routing logic (GoRouter)
│   │   └── theme/            # App theme data
│   ├── data/
│   │   ├── models/           # Data Transfer Objects (DTOs)
│   │   ├── repositories/     # Repository implementations
│   │   └── sources/          # API clients, local database
│   ├── domain/
│   │   ├── entities/         # Core business objects
│   │   ├── repositories/     # Abstract repository interfaces
│   │   └── usecases/         # Business logic
│   └── presentation/
│       ├── blocs/            # BLoC classes for state management
│       ├── screens/          # UI screens (Home, Product, Cart, etc.)
│       └── widgets/          # Reusable UI components
└── test/

State Management

We will use the flutter_bloc package for state management. BLoC is a robust and scalable solution that helps to separate business logic from the UI. Each feature will have its own BLoC to manage its state.

Navigation

Navigation will be handled by the go_router package. This will provide a declarative routing solution that is easy to manage and supports deep linking.

The main routes will be:

  • / (Home)
  • /shop (Shop/Categories)
  • /product/:id (Product Details)
  • /cart (Shopping Cart)
  • /checkout (Checkout Flow)
  • /profile (User Profile)
  • /try-on (Virtual Try-On)

Virtual Try-On Feature

The Virtual Try-On feature will be implemented as follows:

  1. The user navigates to the Virtual Try-On screen from a product detail page.
  2. The user is prompted to either take a photo or select one from their gallery.
  3. The user's photo and the product image are sent to a dedicated service that interacts with the "nano banana gemini api".
  4. The service will handle the API call and receive the generated image.
  5. The generated image will be displayed to the user.

Diagrams

App Architecture

graph TD
    A[Presentation Layer (UI)] -- Interacts with --> B[Domain Layer (Business Logic)];
    B -- Uses --> C[Data Layer (Data Sources)];

    subgraph Presentation Layer
        direction LR
        A1[Widgets] --> A2[BLoCs];
    end

    subgraph Domain Layer
        direction LR
        B1[Use Cases] --> B2[Repositories (Interfaces)];
        B2 --> B3[Entities];
    end

    subgraph Data Layer
        direction LR
        C1[Repositories (Implementations)] --> C2[API Client];
        C1 --> C3[Local Storage];
    end
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Summary of the Design

The proposed design provides a solid foundation for building a scalable and maintainable e-commerce application. The feature-based architecture, combined with the BLoC pattern for state management and go_router for navigation, will enable a clean and organized codebase. The Virtual Try-On feature, powered by the Gemini API, will be a key differentiator and a major focus of the development effort.

References