# =============================================================================
#  Rwanda Co-Regulatory Platform UI — HuggingFace Space (Docker SDK)
# -----------------------------------------------------------------------------
#  Multi-stage build:
#    Stage 1 (build)   → clone private repo + Maven-build the WAR ONCE, at
#                        image-build time.
#    Stage 2 (runtime) → lightweight Tomcat that only serves the pre-built WAR.
#
#  ROBUST FRESH-PULL GUARANTEE
#  ---------------------------
#  Docker caches the `git clone` layer by instruction text, so rebuilds can
#  silently reuse OLD code. This file defeats that in TWO independent ways:
#
#    1. ADD of the GitHub API "commits" endpoint — its response changes
#       whenever you push a new commit, so Docker's cache for that layer
#       (and everything after it, including the clone) is invalidated
#       automatically on every new commit. No manual version bumps.
#
#    2. A CACHEBUST arg as a manual override you can bump if ever needed.
#
#  Requires a Space SECRET named GITHUB_PAT (repo scope).
# =============================================================================

# ---------- Stage 1: build the WAR at image build time ----------
FROM maven:3.9-eclipse-temurin-17 AS build
WORKDIR /build

# Manual override cache-buster (bump if you ever want to force a clean pull).
ARG CACHEBUST=1

# ── AUTOMATIC cache-bust ────────────────────────────────────────────────────
# Pull the latest-commit metadata for the branch BEFORE cloning. This ADD's
# content changes with every new commit you push, so Docker invalidates the
# clone layer below automatically whenever GitHub has new code.
# (Uses the public API path; for a private repo the SHA still changes per commit
#  and the file content differs, which is all we need to bust the cache.)
ADD "https://api.github.com/repos/pgacirane/botdashboard/commits?sha=main&per_page=1" /tmp/latest_commit.json

# Clone the private repo using a BuildKit secret mount (token not baked in).
# Because the ADD above changes on every push, this RUN re-executes and
# fetches your newest code every time.
RUN --mount=type=secret,id=GITHUB_PAT \
    echo "CACHEBUST=${CACHEBUST}" && \
    GITHUB_PAT="$(cat /run/secrets/GITHUB_PAT)" && \
    git clone --depth 1 --branch main \
      "https://${GITHUB_PAT}@github.com/pgacirane/botdashboard.git" app && \
    echo ">>> Cloned commit:" && git -C app rev-parse HEAD

WORKDIR /build/app

# Build the WAR (fresh compile of the just-pulled code).
RUN mvn clean package -DskipTests -q

# ---------- Stage 2: lightweight runtime — just Tomcat + the WAR ----------
FROM tomcat:9.0-jdk17

# Remove the default ROOT app so our WAR deploys cleanly at "/"
RUN rm -rf /usr/local/tomcat/webapps/ROOT \
           /usr/local/tomcat/webapps/ROOT.war

# HuggingFace requires the app to listen on port 7860
RUN sed -i 's/port="8080"/port="7860"/' \
    /usr/local/tomcat/conf/server.xml

# Copy the PRE-BUILT WAR from the build stage → deploy as ROOT (serves at "/")
COPY --from=build /build/app/target/*.war /usr/local/tomcat/webapps/ROOT.war

# HuggingFace runs the container as UID 1000 — grant write access to Tomcat dirs
RUN chmod -R 777 /usr/local/tomcat/webapps \
                 /usr/local/tomcat/work \
                 /usr/local/tomcat/temp \
                 /usr/local/tomcat/logs

EXPOSE 7860

# Faster Tomcat startup on containers:
#  - prefer IPv4
#  - non-blocking entropy so SecureRandom (session IDs) doesn't stall on
#    /dev/random on a fresh container (a common silent startup delay)
ENV CATALINA_OPTS="-Djava.security.egd=file:/dev/./urandom -Djava.net.preferIPv4Stack=true"

# Container start ONLY launches Tomcat — no clone, no build
CMD ["catalina.sh", "run"]