FROM node:20-bookworm-slim

WORKDIR /metrics

# Install Chromium from Debian and runtime deps + fonts
RUN set -eux; \
  apt-get update; \
  apt-get install -y --no-install-recommends \
    # runtime deps used by chromium headless
    chromium \
    libnss3 libxss1 libx11-xcb1 libxcomposite1 libxdamage1 libxext6 libxfixes3 \
    libxkbcommon0 libxrandr2 libatk1.0-0 libatk-bridge2.0-0 libgtk-3-0 \
    libgbm1 libasound2 fonts-liberation \
    # optional fonts for broader charset support
    fonts-ipafont-gothic fonts-wqy-zenhei fonts-thai-tlwg fonts-kacst fonts-freefont-ttf \
    # helpers
    curl unzip ca-certificates; \
  rm -rf /var/lib/apt/lists/*

# Prevent Puppeteer from downloading Chromium
ENV PUPPETEER_SKIP_CHROMIUM_DOWNLOAD=true

# Force flags via a wrapper so no X/Wayland or sandbox is used
# We call Debian's chromium executable (usually /usr/bin/chromium or chromium-browser)
RUN set -eux; \
  CHROME_BIN="$(command -v chromium || command -v chromium-browser)"; \
  printf '%s\n' \
'#!/usr/bin/env bash' \
"exec ${CHROME_BIN} \\" \
'  --no-sandbox --disable-setuid-sandbox \\' \
'  --headless=new --disable-gpu --disable-dev-shm-usage \\' \
'  --no-zygote --no-first-run \\' \
'  --ozone-platform=none --disable-features=UseOzonePlatform \\' \
'  "$@"' \
> /usr/local/bin/chrome-wrapper; \
  chmod +x /usr/local/bin/chrome-wrapper

# Point puppeteer to the wrapper (guarantees the flags are applied)
ENV PUPPETEER_EXECUTABLE_PATH=/usr/local/bin/chrome-wrapper

# Optional envs the app may read
ENV METRICS_BROWSER=chromium
ENV METRICS_BROWSER_HEADLESS=true
ENV METRICS_BROWSER_ARGS=""
ENV METRICS_TRUST_PROXY=1

# Install JS deps
COPY package.json package-lock.json* ./
RUN npm ci

# Copy source and build
COPY . .
RUN npm run build

# Entrypoint that just runs the app; flags are injected by chrome-wrapper
RUN printf '%s\n' \
'#!/usr/bin/env bash' \
'set -euo pipefail' \
'exec npm start' \
> /usr/local/bin/metrics-entrypoint && chmod +x /usr/local/bin/metrics-entrypoint

ENTRYPOINT ["/usr/local/bin/metrics-entrypoint"]