# syntax=docker/dockerfile:1
# ── Build stage ───────────────────────────────────────────────────────────────
# Always run the compiler on the *build* host for speed; cross-compile to target.
FROM --platform=$BUILDPLATFORM rust:1.86-slim-bookworm AS builder

ARG TARGETARCH
ARG TARGETVARIANT

# Cross-compilation toolchains for every supported target.
RUN apt-get update && apt-get install -y \
    pkg-config \
    gcc-aarch64-linux-gnu \
    gcc-arm-linux-gnueabihf \
    gcc-arm-linux-gnueabi \
    && rm -rf /var/lib/apt/lists/*

# Map TARGETARCH + TARGETVARIANT → Rust target triple, then install it.
RUN case "${TARGETARCH}:${TARGETVARIANT}" in \
      "amd64:")  echo x86_64-unknown-linux-gnu         ;; \
      "arm64:")  echo aarch64-unknown-linux-gnu         ;; \
      "arm:v7")  echo armv7-unknown-linux-gnueabihf     ;; \
      "arm:v6")  echo arm-unknown-linux-gnueabi         ;; \
      *)         echo x86_64-unknown-linux-gnu          ;; \
    esac > /rust_target && \
    rustup target add "$(cat /rust_target)"

# Tell Cargo which cross-linker to use for each foreign target.
RUN mkdir -p /root/.cargo && cat >> /root/.cargo/config.toml <<'EOF'
[target.aarch64-unknown-linux-gnu]
linker = "aarch64-linux-gnu-gcc"

[target.armv7-unknown-linux-gnueabihf]
linker = "arm-linux-gnueabihf-gcc"

[target.arm-unknown-linux-gnueabi]
linker = "arm-linux-gnueabi-gcc"
EOF

WORKDIR /build

# Cache dependencies separately from source.
COPY Cargo.toml Cargo.lock* ./
COPY server/Cargo.toml ./server/
RUN mkdir -p server/src && echo 'fn main(){}' > server/src/main.rs
RUN TARGET=$(cat /rust_target) && \
    cargo build --release --target "$TARGET" -p hiy-server 2>/dev/null || true
RUN rm -f server/src/main.rs

# Build actual source.
COPY server/src ./server/src
RUN TARGET=$(cat /rust_target) && \
    touch server/src/main.rs && \
    cargo build --release --target "$TARGET" -p hiy-server

# Normalise binary location so the runtime stage doesn't need to know the target.
RUN cp /build/target/"$(cat /rust_target)"/release/hiy-server /usr/local/bin/hiy-server

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

RUN apt-get update && apt-get install -y \
    ca-certificates \
    git \
    curl \
    bash \
    python3 \
    docker.io \
    && rm -rf /var/lib/apt/lists/*

COPY --from=builder /usr/local/bin/hiy-server /usr/local/bin/hiy-server

WORKDIR /app

CMD ["hiy-server"]