# =============================================================================
# Multi-stage build: compiles pg_trickle from source, then produces a
# scratch-based extension image for CNPG Image Volume Extensions.
#
# The final image contains ONLY the .so, .control, and .sql files — no
# PostgreSQL server, no OS, no shell.
#
# Usage (from project root):
#   docker build -t pg_trickle-ext:latest -f cnpg/Dockerfile.ext-build .
#
# See: https://cloudnative-pg.io/docs/1.28/imagevolume_extensions/
# =============================================================================

# ── Stage 1: Build the extension ────────────────────────────────────────────
FROM postgres:18.3 AS builder

# Install build dependencies
RUN apt-get update && apt-get install -y --no-install-recommends \
        curl \
        build-essential \
        libreadline-dev \
        zlib1g-dev \
        pkg-config \
        libssl-dev \
        libclang-dev \
        clang \
        postgresql-server-dev-18 \
        ca-certificates \
        git \
    && rm -rf /var/lib/apt/lists/*

# Install Rust toolchain (stable)
RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs \
    | sh -s -- -y --default-toolchain stable
ENV PATH="/root/.cargo/bin:${PATH}"

# Install cargo-pgrx (must match the version in Cargo.toml)
RUN cargo install --locked cargo-pgrx --version 0.17.0

# Initialize pgrx for PG 18 using the system pg_config
RUN cargo pgrx init --pg18 /usr/bin/pg_config

# ── Dependency caching layer ────────────────────────────────────────────────
WORKDIR /build
COPY Cargo.toml ./

RUN mkdir -p src/bin src/dvm/operators benches && \
    echo '#![allow(warnings)] fn main() {}' > src/bin/pgrx_embed.rs && \
    echo '#![allow(warnings)]' > src/lib.rs && \
    echo '' > src/dvm/mod.rs && \
    echo '' > src/dvm/operators/mod.rs && \
    echo '' > src/ivm.rs && \
    echo 'fn main() {}' > benches/refresh_bench.rs && \
    echo 'fn main() {}' > benches/diff_operators.rs && \
    cargo generate-lockfile && \
    cargo fetch

# ── Build the real extension ────────────────────────────────────────────────
COPY src/ src/
COPY pg_trickle.control ./

RUN cargo pgrx package --pg-config /usr/bin/pg_config

# Verify artifacts
RUN echo "=== Package artifacts ===" && \
    find target/release/pg_trickle-pg18 -type f && \
    echo "========================="

# ── Stage 2: Scratch extension image ───────────────────────────────────────
FROM scratch

# Copy extension shared library
COPY --from=builder \
    /build/target/release/pg_trickle-pg18/usr/lib/postgresql/18/lib/ \
    /lib/

# Copy extension control + SQL migration files
COPY --from=builder \
    /build/target/release/pg_trickle-pg18/usr/share/postgresql/18/extension/ \
    /share/extension/

# OCI image labels
LABEL org.opencontainers.image.title="pg_trickle-ext" \
      org.opencontainers.image.description="pg_trickle extension for CloudNativePG Image Volume Extensions" \
      org.opencontainers.image.licenses="Apache-2.0"