# Dockerfile.headless
# This Dockerfile creates a minimal, high-speed container solely intended
# for running JuliaMSI scripts via the pre-compiled headless sysimage.
# It explicitly excludes the Genie UI and graphical routing to optimize size and start speed.

FROM julia:1.11

# System dependencies for core MSI math libraries 
RUN apt-get update && apt-get install -y \
    build-essential \
    zlib1g-dev \
    && rm -rf /var/lib/apt/lists/*

WORKDIR /app

# Only copy essential library files (no UI or app.jl required)
COPY Project.toml Manifest.toml ./
COPY src/ ./src/
COPY build_sysimage.jl precompile_script.jl ./
COPY test/ ./test/

# Instantiate the environment
RUN julia --project=. -e 'import Pkg; Pkg.instantiate(); Pkg.precompile()'

# Build the headless sysimage
# This command strips out Genie and plot libraries, creating a pure data-engine .so
RUN julia --project=. build_sysimage.jl --headless

# The resulting image is heavily optimized for zero-JIT execution.
# Default command simply enters a fast REPL.
CMD ["julia", "--project=.", "--threads", "auto", "-J", "sys_msi_headless.so"]