# syntax=docker/dockerfile:1
# Multi-stage build for the tavolo stack (Rust/Axum backend +
# Sycamore/WASM frontend). The Docker build context is the REPOSITORY ROOT
# (see docker-compose.yml) so this single image assembles both parts:
#
#   web-builder   rust + trunk  -> compiles web/ into web/dist
#   rust-builder  rust (alpine) -> compiles server/ into a static musl binary
#   runtime       scratch       -> static binary + compiled frontend
#
# The runtime is a scratch image: the backend is a fully static musl binary,
# embeds its sqlx migrations and serves /static, /assets and the SPA shell
# itself, so no shell, package manager or libc is needed.
#
# TLS trust model: the OIDC client (reqwest 0.12) and Postgres (sqlx) validate
# against Mozilla's roots embedded in the binary by the webpki-roots crate, so
# no certificate files exist in the image. The OTLP exporter is built without
# a TLS backend, so OTEL_EXPORTER_OTLP_ENDPOINT must be http:// (terminate TLS
# in front of the collector if needed).
#
# There is deliberately no HEALTHCHECK (no curl in scratch): Kubernetes
# probes /api/health over HTTP, and Compose gates on its dependency checks.
#
# Build and run it with (from the repository root):
#   docker compose up --build

# --- Web builder -------------------------------------------------------------
FROM rust:1-slim-bookworm AS web-builder

ARG TRUNK_VERSION=0.21.14
# The build environment blocks plain HTTP: force the apt mirrors to HTTPS.
RUN --mount=type=cache,target=/var/cache/apt,sharing=locked \
    --mount=type=cache,target=/var/lib/apt,sharing=locked \
    { sed -i 's|http://deb.debian.org|https://deb.debian.org|g' /etc/apt/sources.list 2>/dev/null || true; } \
 && { sed -i 's|http://deb.debian.org|https://deb.debian.org|g' /etc/apt/sources.list.d/debian.sources 2>/dev/null || true; } \
 && apt-get update \
 && apt-get install -y --no-install-recommends curl ca-certificates \
 && curl -fsSL "https://github.com/trunk-rs/trunk/releases/download/v${TRUNK_VERSION}/trunk-x86_64-unknown-linux-gnu.tar.gz" \
      | tar -xz -C /usr/local/bin \
 && rustup target add wasm32-unknown-unknown

WORKDIR /web

# Card images are committed in the repository (CC0 woodcut napoletane deck);
# web/fetch-cards.sh can regenerate them.
COPY web/Cargo.toml web/Cargo.lock web/index.html web/style.css web/theme.css web/Trunk.toml ./
COPY web/assets ./assets
# Vendored Bootstrap (MIT) loaded by index.html; kept out of the CDN so the
# image builds and runs without network access.
COPY web/vendor ./vendor
COPY web/src ./src

# --public-url makes trunk emit asset URLs under /static, the prefix the
# server mounts in the runtime image. Dev builds (trunk serve) keep the
# default "/" public URL.
RUN --mount=type=cache,target=/usr/local/cargo/registry \
    --mount=type=cache,target=/web/target \
    trunk build --release --public-url /static/

# --- Rust builder (static musl) ----------------------------------------------
FROM rust:1-alpine AS rust-builder

# ring (the only C dependency) compiles with the musl toolchain from build-base.
RUN apk add --no-cache build-base

WORKDIR /build

COPY server/Cargo.toml server/Cargo.lock ./
COPY server/crates ./crates

# The target directory lives in a cache mount (so repeated builds reuse it)
# and the binary is copied out of the mount into the image layer.
RUN --mount=type=cache,target=/usr/local/cargo/registry \
    --mount=type=cache,target=/build/target \
    cargo build --release --locked --target x86_64-unknown-linux-musl \
 && cp target/x86_64-unknown-linux-musl/release/tavolo /tavolo

# --- Runtime (scratch) --------------------------------------------------------
FROM scratch

# Fully static musl binary; no libc, shell or package manager in the image.
# Installed on PATH so `tavolo migrate` / `tavolo serve` work as commands.
COPY --from=rust-builder --chmod=755 /tavolo /usr/local/bin/tavolo
# The compiled single-page application: hashed js/wasm/css under /static and
# the card images under /assets (mounted by the server from STATIC_DIR).
COPY --from=web-builder /web/dist /app/web/dist

ENV STATIC_DIR=/app/web/dist

# Numeric user: scratch has no /etc/passwd and Kubernetes verifies runAsNonRoot.
USER 10001:10001

EXPOSE 8080

CMD ["tavolo", "serve"]