# Brain AI - Hugging Face Deployment Dockerfile
# Built on August 07, 2025 - Using Rust nightly for edition2024 support

FROM rustlang/rust:nightly-slim as builder

# Set Rust build optimizations for faster compilation
ENV CARGO_NET_GIT_FETCH_WITH_CLI=true
ENV CARGO_REGISTRIES_CRATES_IO_PROTOCOL=sparse
ENV CARGO_PROFILE_RELEASE_BUILD_OVERRIDE_DEBUG=false

# Install system dependencies
RUN apt-get update && apt-get install -y \
    pkg-config \
    libssl-dev \
    libsqlite3-dev \
    build-essential \
    curl \
    python3 \
    python3-pip \
    python3-dev \
    && rm -rf /var/lib/apt/lists/*

# Set working directory
WORKDIR /app

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

# Create empty src directories to allow dependency build
RUN find crates -name Cargo.toml -execdir mkdir -p src \; -execdir touch src/lib.rs \;
RUN mkdir -p src && echo "fn main() {}" > src/main.rs

# Build dependencies first (this layer will be cached)
RUN cargo build --release --bin brain; exit 0

# Copy the actual source code
COPY . .

# Build Brain AI with optimizations for faster compilation
RUN CARGO_PROFILE_RELEASE_LTO=off \
    CARGO_PROFILE_RELEASE_CODEGEN_UNITS=16 \
    CARGO_PROFILE_RELEASE_INCREMENTAL=true \
    cargo build --release --bin brain

# Runtime stage
FROM debian:bookworm-slim

# Install runtime dependencies
RUN apt-get update && apt-get install -y \
    libssl3 \
    libsqlite3-0 \
    python3 \
    python3-pip \
    ca-certificates \
    curl \
    && rm -rf /var/lib/apt/lists/*

# Create app user
RUN useradd -m -s /bin/bash appuser

# Set working directory
WORKDIR /app

# Copy built binary and essential files
COPY --from=builder /app/target/release/brain /usr/local/bin/brain
COPY --from=builder /app/web/ ./web/
COPY --from=builder /app/data/ ./data/
COPY --from=builder /app/examples/ ./examples/

# Copy configuration files
COPY --from=builder /app/Cargo.toml ./
COPY --from=builder /app/README.md ./

# Create necessary directories
RUN mkdir -p /app/logs /app/temp /app/sessions

# Set permissions
RUN chown -R appuser:appuser /app
RUN chmod +x /usr/local/bin/brain

# Switch to app user
USER appuser

# Set environment variables for Hugging Face deployment
ENV RUST_LOG=info
ENV BRAIN_PORT=7860
ENV BRAIN_HOST=0.0.0.0
ENV BRAIN_ENV=production
ENV BRAIN_DATA_DIR=/app/data
ENV BRAIN_LOG_DIR=/app/logs
ENV BRAIN_WEB_DIR=/app/web

# Health check
HEALTHCHECK --interval=30s --timeout=10s --start-period=60s --retries=3 \
    CMD curl -f http://localhost:7860/health || exit 1

# Expose port 7860 (Hugging Face Spaces standard)
EXPOSE 7860

# Start Brain AI
CMD ["brain", "--port", "7860", "--host", "0.0.0.0", "--mode", "web"]