# ------------------------------------------------------------------------------
# 1. Builder Stage (Uses modern Rust 1.x stable with 2024 Edition support)
# ------------------------------------------------------------------------------
FROM rust:1-slim-bookworm AS builder

WORKDIR /app

RUN apt-get update && apt-get install -y --no-install-recommends \
    pkg-config \
    libssl-dev \
    ca-certificates \
    && rm -rf /var/lib/apt/lists/*

# Cache dependency builds using skeleton manifests
COPY Cargo.toml ./
RUN mkdir src && echo "fn main() {}" > src/main.rs
RUN cargo build --release
RUN rm -rf src

# Copy real application source code and compile final binary
COPY src ./src
RUN touch src/main.rs && cargo build --release

# ------------------------------------------------------------------------------
# 2. Runtime Stage
# ------------------------------------------------------------------------------
FROM debian:bookworm-slim AS runtime

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

# Non-root user setup (UID 1000 strictly required by Hugging Face Spaces)
RUN useradd -m -u 1000 appuser

# Prepare writable storage directory for Tantivy indices
RUN mkdir -p /data/index && chown -R appuser:appuser /data

WORKDIR /app

# Copy compiled binary from builder
COPY --from=builder /app/target/release/rust-mcp-search /usr/local/bin/rust-mcp-search

ENV PORT=7860 \
    HOST=0.0.0.0 \
    MCP_TRANSPORT=http \
    DATA_DIR=/data/index \
    RUST_LOG=info

# Switch to non-root user
USER 1000

EXPOSE 7860

HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
  CMD curl -f http://localhost:${PORT}/health || exit 1

ENTRYPOINT ["/usr/local/bin/rust-mcp-search"]