# Base stage
FROM ocaml/opam:debian-12-ocaml-5.2 as base
WORKDIR /home/opam/website_monitor

# Install system dependencies
RUN sudo apt-get update && sudo apt-get install -y \
    pkg-config \
    libssl-dev \
    libgmp-dev \
    libev-dev \
    libpq-dev \
    ca-certificates \
    m4 \
    postgresql-client \
    wget \
    && sudo rm -rf /var/lib/apt/lists/*

# Copy project files
COPY --chown=opam:opam dune-project ./
COPY --chown=opam:opam website_monitor.opam ./

# Install dependencies
RUN opam install . --deps-only --with-test

# Build stage (CPU constrained)
FROM base as build
ENV OPAMJOBS=1
ENV OCAMLPARAM=_,_threadsafe

# Copy source code
COPY --chown=opam:opam . .

# Build with CPU constraint
RUN opam exec -- dune build --root . --profile release

# Runtime stage
FROM debian:12-slim as runtime
WORKDIR /app

# Install runtime dependencies
RUN apt-get update && apt-get install -y \
    libssl3 \
    ca-certificates \
    tzdata \
    wget \
    && rm -rf /var/lib/apt/lists/*

# Copy binaries from build stage
COPY --from=build /home/opam/website_monitor/_build/default/bin/main.exe /app/website_monitor
COPY --from=build /home/opam/website_monitor/_build/default/bin/init_db.exe /app/website_monitor_init_db

# Copy entrypoint script
COPY --chown=monitor:monitor docker-entrypoint.sh /app/docker-entrypoint.sh
RUN chmod +x /app/docker-entrypoint.sh

# Create non-root user
RUN useradd -m -u 1000 monitor && chown -R monitor:monitor /app
USER monitor

# Expose port
EXPOSE 8080

# Health check
HEALTHCHECK --interval=30s --timeout=10s --start-period=40s --retries=3 \
    CMD wget --no-verbose --tries=1 --spider http://localhost:8080/health || exit 1

# Run application
ENTRYPOINT ["/app/docker-entrypoint.sh"]
CMD []