# ---- Build Stage ----
FROM golang:1.26 AS builder

WORKDIR /app

# ---- Step 1: Copy go.mod/go.sum for caching ----
# Copy only the minimal files first for layer caching
COPY libshared/go.mod libshared/go.sum ./libshared/
COPY identity-manager/go.mod identity-manager/go.sum ./identity-manager/

# ---- Step 2: Download dependencies ----
RUN go -C libshared mod download
RUN go -C identity-manager mod download

# ---- Step 3: Copy full source code ----
COPY libshared ./libshared
COPY identity-manager ./identity-manager

# ---- Step 4: Create Go workspace inside container ----
RUN go work init ./identity-manager ./libshared

## Optional: verify workspace
#RUN go work list

# ---- Step 5: Build binary ----
WORKDIR /app/identity-manager
RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -o server

# ---- Runtime Stage ----
FROM gcr.io/distroless/base-debian12

WORKDIR /app
COPY --from=builder /app/identity-manager/server .

EXPOSE 8080
USER nonroot:nonroot
ENTRYPOINT ["/app/server"]