# --- Builder Stage ---
FROM golang:1.25-alpine AS builder

# Arbeitsverzeichnis
WORKDIR /app

# Go-Module laden
COPY go.mod ./
RUN go mod download

# Quellcode
COPY . .

# Binary bauen (statisch, kleiner)
RUN CGO_ENABLED=0 GOOS=linux go build -o subnetcalc .

# --- Runtime Stage ---
FROM alpine:3.22

WORKDIR /app

# Binary vom Builder kopieren
COPY --from=builder /app/subnetcalc .

# Exponiere Port für Webinterface
EXPOSE 8080

# Standardkommando: immer Web-Modus starten
ENTRYPOINT ["./subnetcalc", "-web", ":8080"]