# Multi-stage build for optimized production image
FROM rust:1.83 as builder

WORKDIR /app

# Copy manifests for dependency caching
COPY Cargo.toml Cargo.lock* ./

# Create dummy source for dependency caching
RUN mkdir -p src && \
    echo "fn main() {}" > src/main.rs && \
    cargo build --release && \
    rm -rf src

# Copy the actual source code
COPY src/ src/

# Force rebuild with actual source
RUN touch src/main.rs && rm -f target/release/calendar-microservice && cargo build --release

# Runtime stage
FROM debian:bookworm-slim

WORKDIR /app

# Install runtime dependencies
RUN apt-get update && \
    apt-get install -y --no-install-recommends ca-certificates libssl3 curl && \
    rm -rf /var/lib/apt/lists/*

# Create non-root user
RUN useradd -r -s /bin/false appuser

# Copy the built binary
COPY --from=builder /app/target/release/calendar-microservice /app/calendar-microservice

# Set ownership
RUN chown appuser:appuser /app/calendar-microservice

# Switch to non-root user
USER appuser

# Environment defaults
ENV HOST=0.0.0.0
ENV PORT=4000
ENV RUST_LOG=info

EXPOSE 4000

# Health check
HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
    CMD curl -f http://localhost:4000/api/v1/health || exit 1

CMD ["/app/calendar-microservice"]