# kavinrajmani/countries_app architecture

> Architecture diagram of the GitHub repository kavinrajmani/countries_app, generated by GitDiagram from its file tree, README and a sample of source files (last updated 2026-11-11). It is an AI-made overview: check details against the source.

- Interactive diagram: https://gitdiagram.com/kavinrajmani/countries_app
- Repository: https://github.com/kavinrajmani/countries_app

## Overview

Countries App is a Flutter app for browsing country information, with search, region filtering, detail views, favorites, and light/dark themes documented in the README. The likely user workflow begins at the app entry point, moves through the country list and optional detail or favorites views, and uses country data and preferences services. Dart implementation excerpts were not provided, so app-level wiring is shown as unverified dashed relationships; native runner files are platform launch scaffolding, not the product workflow.

Main entry points: [`lib/screens/home_screen.dart`](https://github.com/kavinrajmani/countries_app/blob/main/lib/screens/home_screen.dart) (Country list), [`lib/screens/main_screen.dart`](https://github.com/kavinrajmani/countries_app/blob/main/lib/screens/main_screen.dart) (Main screen), [`lib/services/api_service.dart`](https://github.com/kavinrajmani/countries_app/blob/main/lib/services/api_service.dart) (Country API service), [`lib/main.dart`](https://github.com/kavinrajmani/countries_app/blob/main/lib/main.dart) (App entry)

## Diagram (Mermaid)

```mermaid
flowchart TD

subgraph group_ui["Country browsing"]
  node_entry["App entry<br/>[main.dart]"]
  node_main["Main screen<br/>[main_screen.dart]"]
  node_home["Country list<br/>[home_screen.dart]"]
  node_details["Country details"]
  node_favorites["Favorites"]
  node_card["Country card<br/>[country_card.dart]"]
  node_navigation["Navigation helper"]
end

subgraph group_data["Country data"]
  node_api["Country API service<br/>[api_service.dart]"]
  node_country["Country model<br/>[country.dart]"]
  node_storage["Local storage"]
end

subgraph group_prefs["Preferences and theme"]
  node_theme_provider["Theme provider"]
  node_theme["Theme definitions<br/>[app_theme.dart]"]
end

node_user(("User"))
node_country_api{{"Country data source"}}

node_user -.->|"opens app"| node_entry
node_entry -.->|"starts"| node_main
node_main -.->|"shows list"| node_home
node_home -.->|"loads countries"| node_api
node_api -.->|"requests data"| node_country_api
node_api -.->|"maps results"| node_country
node_home -.->|"renders countries"| node_card
node_user -.->|"searches or filters"| node_home
node_home -.->|"opens details"| node_navigation
node_navigation -.->|"routes to"| node_details
node_main -.->|"shows favorites"| node_favorites
node_favorites -.->|"loads favorites"| node_storage
node_details -.->|"displays information"| node_country
node_user -.->|"changes theme"| node_theme_provider
node_theme_provider -.->|"selects theme"| node_theme

click node_entry "https://github.com/kavinrajmani/countries_app/blob/main/lib/main.dart"
click node_main "https://github.com/kavinrajmani/countries_app/blob/main/lib/screens/main_screen.dart"
click node_home "https://github.com/kavinrajmani/countries_app/blob/main/lib/screens/home_screen.dart"
click node_details "https://github.com/kavinrajmani/countries_app/blob/main/lib/screens/country_details_screen.dart"
click node_favorites "https://github.com/kavinrajmani/countries_app/blob/main/lib/screens/favorites_screen.dart"
click node_card "https://github.com/kavinrajmani/countries_app/blob/main/lib/widgets/country_card.dart"
click node_navigation "https://github.com/kavinrajmani/countries_app/blob/main/lib/utils/navigation_helper.dart"
click node_api "https://github.com/kavinrajmani/countries_app/blob/main/lib/services/api_service.dart"
click node_country "https://github.com/kavinrajmani/countries_app/blob/main/lib/models/country.dart"
click node_storage "https://github.com/kavinrajmani/countries_app/blob/main/lib/services/storage_service.dart"
click node_theme_provider "https://github.com/kavinrajmani/countries_app/blob/main/lib/providers/theme_provider.dart"
click node_theme "https://github.com/kavinrajmani/countries_app/blob/main/lib/theme/app_theme.dart"

classDef toneNeutral fill:#f8fafc,stroke:#334155,stroke-width:1.5px,color:#0f172a
classDef toneBlue fill:#dbeafe,stroke:#2563eb,stroke-width:1.5px,color:#172554
classDef toneAmber fill:#fef3c7,stroke:#d97706,stroke-width:1.5px,color:#78350f
classDef toneMint fill:#dcfce7,stroke:#16a34a,stroke-width:1.5px,color:#14532d
classDef toneRose fill:#ffe4e6,stroke:#e11d48,stroke-width:1.5px,color:#881337
classDef toneIndigo fill:#e0e7ff,stroke:#4f46e5,stroke-width:1.5px,color:#312e81
classDef toneTeal fill:#ccfbf1,stroke:#0f766e,stroke-width:1.5px,color:#134e4a
class node_entry,node_main,node_home,node_details,node_favorites,node_card,node_navigation,node_user toneBlue
class node_api,node_country,node_storage toneAmber
class node_theme_provider,node_theme toneMint
class node_country_api toneIndigo
```

## Components

### Country browsing

- [App entry](https://github.com/kavinrajmani/countries_app/blob/main/lib/main.dart): `lib/main.dart`
- [Main screen](https://github.com/kavinrajmani/countries_app/blob/main/lib/screens/main_screen.dart): `lib/screens/main_screen.dart`
- [Country list](https://github.com/kavinrajmani/countries_app/blob/main/lib/screens/home_screen.dart): `lib/screens/home_screen.dart`
- [Country details](https://github.com/kavinrajmani/countries_app/blob/main/lib/screens/country_details_screen.dart): `lib/screens/country_details_screen.dart`
- [Favorites](https://github.com/kavinrajmani/countries_app/blob/main/lib/screens/favorites_screen.dart): `lib/screens/favorites_screen.dart`
- [Country card](https://github.com/kavinrajmani/countries_app/blob/main/lib/widgets/country_card.dart): `lib/widgets/country_card.dart`
- [Navigation helper](https://github.com/kavinrajmani/countries_app/blob/main/lib/utils/navigation_helper.dart): `lib/utils/navigation_helper.dart`

### Country data

- [Country API service](https://github.com/kavinrajmani/countries_app/blob/main/lib/services/api_service.dart): `lib/services/api_service.dart`
- [Country model](https://github.com/kavinrajmani/countries_app/blob/main/lib/models/country.dart): `lib/models/country.dart`
- [Local storage](https://github.com/kavinrajmani/countries_app/blob/main/lib/services/storage_service.dart): `lib/services/storage_service.dart`

### Preferences and theme

- [Theme provider](https://github.com/kavinrajmani/countries_app/blob/main/lib/providers/theme_provider.dart): `lib/providers/theme_provider.dart`
- [Theme definitions](https://github.com/kavinrajmani/countries_app/blob/main/lib/theme/app_theme.dart): `lib/theme/app_theme.dart`

### Other components

- **User**
- **Country data source**

## Connections

- User → App entry: opens app
- App entry → Main screen: starts
- Main screen → Country list: shows list
- Country list → Country API service: loads countries
- Country API service → Country data source: requests data
- Country API service → Country model: maps results
- Country list → Country card: renders countries
- User → Country list: searches or filters
- Country list → Navigation helper: opens details
- Navigation helper → Country details: routes to
- Main screen → Favorites: shows favorites
- Favorites → Local storage: loads favorites
- Country details → Country model: displays information
- User → Theme provider: changes theme
- Theme provider → Theme definitions: selects theme