FROM rust:latest AS deps
WORKDIR /build

# protobuf compiler for tonic-build
RUN apt-get update && apt-get install -y protobuf-compiler && rm -rf /var/lib/apt/lists/*

# Copy dependency manifests, vendored crates, and proto files first (cached layer)
COPY Cargo.toml Cargo.lock build.rs ./
COPY proto/ proto/
COPY vendor/ vendor/

# Set up vendored dependency resolution
RUN mkdir -p .cargo && \
    printf '[registries.sunbeam]\nindex = "sparse+https://src.sunbeam.pt/api/packages/studio/cargo/"\n\n[source.crates-io]\nreplace-with = "vendored-sources"\n\n[source."sparse+https://src.sunbeam.pt/api/packages/studio/cargo/"]\nregistry = "sparse+https://src.sunbeam.pt/api/packages/studio/cargo/"\nreplace-with = "vendored-sources"\n\n[source.vendored-sources]\ndirectory = "vendor/"\n' \
    > .cargo/config.toml

# Build deps only with a dummy main.rs — this layer is cached until Cargo.toml/vendor change
RUN mkdir -p src && echo "fn main(){}" > src/main.rs && \
    cargo build --release --target x86_64-unknown-linux-gnu && \
    rm src/main.rs && rm target/x86_64-unknown-linux-gnu/release/sol

FROM deps AS builder

# Copy actual source — only Sol code recompiles, deps are cached
COPY src/ src/

# Touch source to ensure cargo detects changes (COPY preserves host mtimes)
RUN find src/ -name '*.rs' -exec touch {} + && \
    cargo build --release --target x86_64-unknown-linux-gnu

FROM gcr.io/distroless/cc-debian12:nonroot
COPY --from=builder /build/target/x86_64-unknown-linux-gnu/release/sol /
ENTRYPOINT ["/sol"]