# Stage 1: Build
FROM rust:1.94-bookworm AS builder

WORKDIR /usr/src/app

# Cache dependency build: only re-runs when Cargo.toml/lock change
COPY Cargo.toml Cargo.lock* ./
RUN mkdir src && echo 'fn main() {}' > src/main.rs && cargo build --release && rm -rf src

# Now copy real source and build (dependencies already compiled)
COPY src/ src/
RUN touch src/main.rs && cargo build --release

# Stage 2: Runtime
FROM debian:bookworm-slim

RUN apt-get update && \
    apt-get install -y --no-install-recommends ca-certificates curl && \
    rm -rf /var/lib/apt/lists/*

COPY --from=builder /usr/src/app/target/release/maps-backend /usr/local/bin/maps-backend

EXPOSE 8080

CMD ["maps-backend"]