# Dockerfile
FROM rust:1.94.1 AS builder
WORKDIR /app

# Install build dependencies (OpenSSL + pkg-config)
RUN apt-get update && apt-get install -y \
    pkg-config \
    libssl-dev \
    && rm -rf /var/lib/apt/lists/*

# Copy dependency files first for better layer caching
COPY Cargo.toml Cargo.lock ./

# Pre-build dependencies (this layer caches well)
RUN mkdir src && echo "fn main() {}" > src/main.rs
RUN cargo build --release
RUN rm -rf src

# Now copy real source
COPY . .

# Build the real binary
RUN cargo build --release

# Final minimal runtime image
FROM debian:trixie-slim
RUN apt-get update && apt-get install -y ca-certificates curl && rm -rf /var/lib/apt/lists/*

# Copy the binary from builder
COPY --from=builder /app/target/release/data_backend /usr/local/bin/data_backend

EXPOSE 3001
CMD ["data_backend"]