# Production image. Built by docker-compose.yml (`build: .`).
FROM rust:latest AS builder

WORKDIR /app

# Build dependencies
RUN apt-get update && apt-get install -y \
    pkg-config \
    libssl-dev \
    && rm -rf /var/lib/apt/lists/*

# Copy Cargo files and cache dependency build via a dummy main.rs
COPY Cargo.toml Cargo.lock ./
RUN mkdir src && echo "fn main() {}" > src/main.rs
RUN cargo build --release && rm -rf src

# Copy actual source and build the application
COPY src ./src
RUN touch src/main.rs && cargo build --release

# --- runtime stage ---
FROM debian:bookworm-slim

# curl is required for the compose HEALTHCHECK to work.
RUN apt-get update && apt-get install -y \
    ca-certificates \
    libssl3 \
    curl \
    && rm -rf /var/lib/apt/lists/*

WORKDIR /app
COPY --from=builder /app/target/release/normogen-backend /app/normogen-backend

# The app listens on NORMOGEN_PORT (default 6500, set in compose/.env).
EXPOSE 6500

CMD ["./normogen-backend"]