# Codebase Discovery

## Directory Tree

```
satellite-provider/
├── SatelliteProvider.sln
├── global.json
├── docker-compose.yml
├── docker-compose.tests.yml
├── goal.md
├── README.md
├── AGENTS.md
├── .woodpecker/
│   ├── 01-test.yml
│   └── 02-build-push.yml
├── SatelliteProvider.Api/
│   ├── Dockerfile
│   ├── Program.cs
│   ├── SatelliteProvider.Api.csproj
│   ├── Properties/launchSettings.json
│   ├── appsettings.json
│   └── appsettings.Development.json
├── SatelliteProvider.Common/
│   ├── SatelliteProvider.Common.csproj
│   ├── Configs/
│   │   ├── DatabaseConfig.cs
│   │   ├── MapConfig.cs
│   │   ├── ProcessingConfig.cs
│   │   └── StorageConfig.cs
│   ├── DTO/
│   │   ├── CreateRouteRequest.cs
│   │   ├── Direction.cs
│   │   ├── GeoPoint.cs
│   │   ├── GeofencePolygon.cs
│   │   ├── RegionRequest.cs
│   │   ├── RegionStatusResponse.cs
│   │   ├── RoutePoint.cs
│   │   ├── RoutePointDto.cs
│   │   ├── RouteResponse.cs
│   │   ├── SatTile.cs
│   │   └── TileMetadata.cs
│   ├── Interfaces/
│   │   ├── IRegionRequestQueue.cs
│   │   ├── IRegionService.cs
│   │   ├── IRouteService.cs
│   │   ├── ISatelliteDownloader.cs
│   │   └── ITileService.cs
│   └── Utils/
│       └── GeoUtils.cs
├── SatelliteProvider.DataAccess/
│   ├── SatelliteProvider.DataAccess.csproj
│   ├── DatabaseMigrator.cs
│   ├── Migrations/
│   │   ├── 001_CreateTilesTable.sql
│   │   ├── 002_CreateRegionsTable.sql
│   │   ├── 003_CreateIndexes.sql
│   │   ├── 004_AddVersionColumn.sql
│   │   ├── 005_CreateRoutesTables.sql
│   │   ├── 006_AddStitchTilesToRegions.sql
│   │   ├── 007_AddRouteMapFields.sql
│   │   ├── 008_AddGeofenceFlagToRouteRegions.sql
│   │   ├── 009_AddGeofencePolygonIndex.sql
│   │   ├── 010_AddTilesZipToRoutes.sql
│   │   └── 011_AddTileCoordinates.sql
│   ├── Models/
│   │   ├── RegionEntity.cs
│   │   ├── RouteEntity.cs
│   │   ├── RoutePointEntity.cs
│   │   └── TileEntity.cs
│   └── Repositories/
│       ├── IRegionRepository.cs
│       ├── IRouteRepository.cs
│       ├── ITileRepository.cs
│       ├── RegionRepository.cs
│       ├── RouteRepository.cs
│       └── TileRepository.cs
├── SatelliteProvider.Services/
│   ├── SatelliteProvider.Services.csproj
│   ├── GoogleMapsDownloaderV2.cs
│   ├── RegionProcessingService.cs
│   ├── RegionRequestQueue.cs
│   ├── RegionService.cs
│   ├── RouteProcessingService.cs
│   ├── RouteService.cs
│   └── TileService.cs
├── SatelliteProvider.Tests/
│   ├── SatelliteProvider.Tests.csproj
│   ├── GoogleMapsDownloaderTests.cs
│   └── appsettings.json
└── SatelliteProvider.IntegrationTests/
    ├── SatelliteProvider.IntegrationTests.csproj
    ├── Dockerfile
    ├── Program.cs
    ├── Models.cs
    ├── BasicRouteTests.cs
    ├── ComplexRouteTests.cs
    ├── ExtendedRouteTests.cs
    ├── RegionTests.cs
    ├── TileTests.cs
    └── RouteTestHelpers.cs
```

## Tech Stack

| Category | Technology | Version |
|----------|-----------|---------|
| Language | C# | 14 (.NET 10) — was C# 12 / .NET 8.0 through cycle 3 (AZ-500) |
| Framework | ASP.NET Core (Minimal API) | 10.0 — was 8.0 through cycle 3 (AZ-500) |
| Database | PostgreSQL | 16 (Docker image) |
| ORM/Data Access | Dapper | 2.1.35 |
| DB Migrations | DbUp (PostgreSQL) | 6.0.3 |
| Logging | Serilog (Console + File) | 8.0.3 (Serilog.AspNetCore — fallback retained on .NET 10 per AZ-500 Risk #4: no 10.x line published; restores cleanly via netstandard 2.0) |
| Image Processing | SixLabors.ImageSharp | 3.1.11 |
| JSON Serialization | Newtonsoft.Json + System.Text.Json | 13.0.4 |
| API Docs | Swagger / Swashbuckle | 10.1.7 (was 6.6.2; bumped by AZ-500 to land Microsoft.OpenApi 2.x compat — required by ASP.NET Core 10) |
| HTTP Client | IHttpClientFactory | built-in |
| Containerization | Docker (multi-stage) | - |
| Orchestration | Docker Compose | - |
| CI/CD | Woodpecker CI | - |
| Unit Testing | xUnit + Moq + FluentAssertions | 2.5.3 / 4.20.72 / 8.8.0 |
| Integration Testing | Console app (custom harness) | - |
| SDK | .NET 10 (latestMinor rollForward) | 10.0.0+ — was .NET 8.0 / 8.0.0+ through cycle 3 (AZ-500) |

## Dependency Graph

### Project References

```
SatelliteProvider.Common          (leaf — no project references)
SatelliteProvider.DataAccess      (leaf — no project references; NuGet: Dapper, Npgsql, DbUp)
SatelliteProvider.Services        → Common, DataAccess
SatelliteProvider.Api             → Common, DataAccess, Services
SatelliteProvider.Tests           → Services, Common
SatelliteProvider.IntegrationTests (standalone console app, no project references)
```

### Mermaid Dependency Diagram

```mermaid
graph TD
    Api[SatelliteProvider.Api] --> Services[SatelliteProvider.Services]
    Api --> DataAccess[SatelliteProvider.DataAccess]
    Api --> Common[SatelliteProvider.Common]
    Services --> DataAccess
    Services --> Common
    Tests[SatelliteProvider.Tests] --> Services
    Tests --> Common
    IntTests[SatelliteProvider.IntegrationTests] -.->|HTTP calls| Api
```

## Topological Processing Order

Leaf modules first, then dependent modules:

1. **SatelliteProvider.Common** — DTOs, interfaces, configs, geo utilities (no internal dependencies)
2. **SatelliteProvider.DataAccess** — entities, repositories, migrations (no project dependencies)
3. **SatelliteProvider.Services** — business logic (depends on Common + DataAccess)
4. **SatelliteProvider.Api** — web layer, DI, endpoints (depends on all above)
5. **SatelliteProvider.Tests** — unit tests (depends on Services + Common)
6. **SatelliteProvider.IntegrationTests** — integration tests via HTTP (standalone)

## Entry Points

- **Application entry**: `SatelliteProvider.Api/Program.cs` — minimal API startup, DI registration, DB migration, endpoint mapping
- **Background services**: `RegionProcessingService` (queue consumer), `RouteProcessingService` (polling loop)
- **Integration test entry**: `SatelliteProvider.IntegrationTests/Program.cs`

## Leaf Modules

- `SatelliteProvider.Common/Configs/*` — configuration POCOs
- `SatelliteProvider.Common/DTO/*` — data transfer objects
- `SatelliteProvider.Common/Interfaces/*` — service contracts
- `SatelliteProvider.Common/Utils/GeoUtils.cs` — static geo math utilities
- `SatelliteProvider.DataAccess/Models/*` — database entity classes
- `SatelliteProvider.DataAccess/Migrations/*` — SQL migration scripts

## Cycles

No dependency cycles detected. The dependency graph is a clean DAG.

## External Integrations

| Integration | Module | Protocol |
|-------------|--------|----------|
| Google Maps Tile API | GoogleMapsDownloaderV2 | HTTPS (tile.googleapis.com, mt*.google.com) |
| PostgreSQL | All repositories | TCP (Npgsql, port 5432) |
| File system (tiles) | StorageConfig, TileService, GoogleMapsDownloaderV2 | Local FS (./tiles/) |
| File system (output) | RegionService, RouteProcessingService | Local FS (./ready/) |
| File system (logs) | Serilog | Local FS (./logs/) |

## Existing Documentation

- `README.md` — comprehensive API docs, architecture overview, configuration guide
- `AGENTS.md` — agent-oriented documentation with architecture details and conventions
- `goal.md` — original requirements and TODO items
- Swagger/OpenAPI — auto-generated at runtime (`/swagger`)

## Test Structure

- **Unit tests**: `SatelliteProvider.Tests/` — xUnit, currently contains only a dummy test (`DummyTests.Dummy_ShouldWork`)
- **Integration tests**: `SatelliteProvider.IntegrationTests/` — console app that runs against a live API+DB instance in Docker. Tests cover tile downloads, region requests, route creation with intermediate points, geofencing, extended routes with map requests.

## CI/CD

- **Woodpecker CI** pipelines in `.woodpecker/`:
  - `01-test.yml`: runs `dotnet restore` + `dotnet test` on push/PR to dev/stage/main (ARM64)
  - `02-build-push.yml`: builds Docker image and pushes to private registry (depends on 01-test, ARM64 matrix with AMD64 slot commented out)

## Updates Since Baseline

Treat the directory tree, dependency listing, and test-structure section above as a 2026-05-10 snapshot. Refer to `module-layout.md` for the current authoritative layout. Material changes since baseline:

**2026-05-10 — AZ-309 (02-coupling-refactoring)**
- `SatelliteProvider.Services/` was split into three csprojs: `SatelliteProvider.Services.TileDownloader`, `SatelliteProvider.Services.RegionProcessing`, `SatelliteProvider.Services.RouteManagement`. Cross-sibling calls now flow only through interfaces in `SatelliteProvider.Common.Interfaces`.
- `RateLimitException` moved from Services into `SatelliteProvider.Common.Exceptions`.
- Per-component DI extension methods (`AddTileDownloader`, `AddRegionProcessing`, `AddRouteManagement`) now own their registrations; `Program.cs` calls them.

**2026-05-11 — AZ-350 (03-code-quality-refactoring), 27 changes C01..C27**
- Format / static-analysis tooling added (AZ-372 / C19):
  - `.editorconfig` at repo root: `indent_style=space`, `indent_size=4`, `end_of_line=lf`, `charset=utf-8` (no BOM), `trim_trailing_whitespace=true`, `insert_final_newline=true`, file-scoped namespaces.
  - `Directory.Build.props` enables `Microsoft.CodeAnalysis.NetAnalyzers` repository-wide; CA1001, CA1051, CA1816, CA2227 elevated to warning.
  - Coverlet (`coverlet.collector`) wired into `SatelliteProvider.Tests`; `dotnet test --collect:"XPlat Code Coverage"` writes `cobertura.xml` to `TestResults/`.
  - `scripts/run-tests.sh` runs `dotnet format whitespace --verify-no-changes` as Step 0 (gating); `--unit-only`, `--smoke`, `--full` modes documented.
- HTTP / DI hardening:
  - `IExceptionHandler`-based `GlobalExceptionHandler` sanitizes 5xx ProblemDetails (AZ-353 / C03).
  - Permissive CORS replaced with strict-by-default policy (AZ-354 / C04); permissive policy is opt-in per `CorsConfig.AllowAnyOrigin` and warns in production.
  - Stub endpoints `/api/satellite/tiles/mgrs` and `/api/satellite/upload` now return HTTP 501 instead of 500 (AZ-356 / C05).
  - Idempotent POST contract for `/api/satellite/request` and `/api/satellite/route` returns the existing resource on duplicate id without re-enqueueing (AZ-362 / C09).
  - Typed HttpClient `GoogleMapsTiles` registered in DI (AZ-374 / C21).
- Domain model cleanup:
  - `RegionStatus` and `RoutePointType` enums replace string status fields end-to-end with case-insensitive parse + lowercase write (AZ-370 / C17).
  - Tile `Version` and `MapsVersion` deprecated (AZ-357 / C06, AZ-373 / C20); migration 012 dedupes existing rows and reshapes the unique index to `(latitude, longitude, tile_zoom, tile_size_meters)`.
- Algorithmic / structural cleanup:
  - `RouteProcessingService` god-class decomposed (AZ-364 / C11); `RouteService.CreateRouteAsync` decomposed (AZ-365 / C12); `IServiceProvider` lookups replaced with explicit dependencies (AZ-360 / C08); `RegionService` catch ladder consolidated (AZ-359 / C07).
  - Shared helpers extracted: `TileCsvWriter` (AZ-368 / C15), `TileGridStitcher` (AZ-367 / C14), Haversine + filename parser (AZ-366 / C13).
  - Inline DTOs moved out of `Program.cs` into `Common.DTO` (AZ-369 / C16).
  - Repository `ColumnList` constants extracted (AZ-379 / C26); per-cell `FirstOrDefault` tile lookup replaced with `HashSet` membership (AZ-375 / C22); Earth + tile-pixel constants consolidated to `GeoUtils` and `MapConfig.DefaultTileSizePixels` (AZ-377 / C24).
  - Dead code removed: `FindExistingTileAsync` (AZ-376 / C23), `CalculatePolygonDiagonalDistance` (AZ-380 / C27), unused write-only counters in `RegionRequestQueue` (AZ-363 / C10).
  - Empty catch in `ExtractTileCoordinatesFromFilename` replaced with logging + sentinel return (AZ-352 / C02); null logger in `DatabaseMigrator` fixed (AZ-351 / C01).
  - Magic numbers promoted to `ProcessingConfig` / `MapConfig` (AZ-371 / C18).
  - Unused repo logger fields removed from `RegionRepository` and `RouteRepository`; `TileRepository` keeps its logger and emits slow-query warnings ≥ 500ms (AZ-378 / C25).
- Test growth: 37 unit tests → 200 unit tests (per AZ-37x batch test sweeps); smoke run extended with AZ-353/AZ-356/AZ-357/AZ-362/SEC-01..04/CORS scenarios.

For the authoritative current layout see `_docs/02_document/module-layout.md`. For the per-batch detail see `_docs/03_implementation/batch_*_report.md` and `_docs/03_implementation/reviews/`.