FROM rust:1.87-slim AS builder

WORKDIR /build

RUN apt-get update && apt-get install -y pkg-config libssl-dev && rm -rf /var/lib/apt/lists/*

# Copy workspace manifests
COPY Cargo.toml Cargo.lock ./

# Copy only the crates needed for klog-backend
COPY crates/ktracing/Cargo.toml crates/ktracing/Cargo.toml
COPY crates/ktracing-subscriber/Cargo.toml crates/ktracing-subscriber/Cargo.toml
COPY klog/backend/Cargo.toml klog/backend/Cargo.toml
COPY klog/klog-cli/Cargo.toml klog/klog-cli/Cargo.toml
COPY klog/types/Cargo.toml klog/types/Cargo.toml

# Stub out every workspace member so Cargo can resolve the graph without full source
RUN find . -name "Cargo.toml" -not -path "./Cargo.toml" | while read f; do \
      dir=$(dirname "$f"); \
      mkdir -p "$dir/src"; \
      echo 'fn main() {}' > "$dir/src/main.rs"; \
      touch "$dir/src/lib.rs"; \
    done

# Build deps only (cache layer)
RUN cargo build --release -p klog-backend 2>/dev/null || true

# Now copy real source
COPY crates/ktracing/src crates/ktracing/src
COPY crates/ktracing-subscriber/src crates/ktracing-subscriber/src
COPY klog/backend/src klog/backend/src
COPY klog/types/src klog/types/src

# Touch to invalidate cached stubs
RUN find klog/backend/src klog/types/src crates/ktracing/src crates/ktracing-subscriber/src \
      -name "*.rs" -exec touch {} +

RUN cargo build --release -p klog-backend

# ── Runtime image ─────────────────────────────────────────────────────────────
FROM debian:bookworm-slim

RUN apt-get update && apt-get install -y ca-certificates && rm -rf /var/lib/apt/lists/*

COPY --from=builder /build/target/release/klog-backend /usr/local/bin/klog-backend

ENV PORT=3000
EXPOSE 3000

CMD ["/usr/local/bin/klog-backend"]