@startuml
!include <C4/C4_Container>

title Container Diagram: Familienarchiv

Person(user, "User", "Admin or family member")
System_Ext(mail, "Email Service", "SMTP server. Delivers notification and password-reset emails.")

Container(caddy, "Reverse Proxy", "Caddy 2 (host-installed)", "TLS termination (auto Let's Encrypt). Routes /api/* to backend:8080, everything else to frontend:3000. Responds 404 on /actuator/* and adds HSTS, X-Content-Type-Options, Referrer-Policy headers.")

System_Boundary(archiv, "Familienarchiv (Docker Compose)") {
    Container(frontend, "Web Frontend", "SvelteKit / Node adapter / port 3000", "Server-side rendered UI. Handles auth session cookies, document search and viewer, transcription editor, annotation layer, family tree (Stammbaum), stories (Geschichten), activity feed (Chronik), enrichment workflow, and admin panel.")
    Container(backend, "API Backend", "Spring Boot 4 / Java 21 / Jetty / port 8080", "REST API. Implements document management, search, user auth, file upload/download, transcription, OCR orchestration, and SSE notifications. Trusts X-Forwarded-* headers from Caddy.")
    Container(ocr, "OCR Service", "Python FastAPI / port 8000", "Handwritten text recognition (HTR) and OCR microservice. Single-node by design — see ADR-001. Reachable only on the internal Docker network; no external port exposed.")
    ContainerDb(db, "Relational Database", "PostgreSQL 16", "Stores document metadata, persons, users, permission groups, tags, transcription blocks, audit log, and Spring Session data.")
    ContainerDb(storage, "Object Storage", "MinIO (S3-compatible)", "Stores the actual document files (PDFs, scans). Backend uses a bucket-scoped service account (archiv-app), not MinIO root.")
    Container(mc, "Bucket / Service-Account Init", "MinIO Client (mc)", "One-shot container on startup. Idempotent: creates the archive bucket, the archiv-app service account, and attaches the readwrite policy.")
}

Rel(user, caddy, "HTTPS", "TLS 1.2/1.3")
Rel(caddy, frontend, "Reverse proxies non-/api requests", "HTTP / loopback:3000")
Rel(caddy, backend, "Reverse proxies /api/*", "HTTP / loopback:8080")
Rel(frontend, backend, "API requests with Basic Auth token", "HTTP / REST / JSON")
Rel(backend, user, "SSE notifications (server-sent events)", "HTTP / SSE — fronted by Caddy")
Rel(backend, db, "Reads and writes metadata and sessions", "JDBC / SQL")
Rel(backend, storage, "Uploads and streams document files using archiv-app service account", "HTTP / S3 API (AWS SDK v2)")
Rel(backend, ocr, "OCR job requests with presigned MinIO URL", "HTTP / REST / JSON")
Rel(backend, mail, "Sends notification and password-reset emails (optional)", "SMTP")
Rel(ocr, storage, "Fetches PDF via presigned URL", "HTTP / S3 presigned")
Rel(mc, storage, "Bootstraps bucket + service account on startup", "MinIO Client CLI")

@enduml