FROM node:20-bookworm-slim

WORKDIR /metrics

# Install Google Chrome stable and runtime deps + fonts
RUN set -eux; \
  apt-get update; \
  apt-get install -y --no-install-recommends \
    wget gnupg ca-certificates curl unzip \
    # Chrome runtime deps
    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; \
  wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | gpg --dearmor -o /usr/share/keyrings/google-linux.gpg; \
  echo "deb [arch=amd64 signed-by=/usr/share/keyrings/google-linux.gpg] http://dl.google.com/linux/chrome/deb/ stable main" > /etc/apt/sources.list.d/google-chrome.list; \
  apt-get update; \
  apt-get install -y --no-install-recommends google-chrome-stable; \
  rm -rf /var/lib/apt/lists/*

# Prevent Puppeteer from downloading Chromium, point to system Chrome
ENV PUPPETEER_SKIP_CHROMIUM_DOWNLOAD=true
ENV PUPPETEER_EXECUTABLE_PATH=/usr/bin/google-chrome-stable

# Default Chrome args suitable for containers (headless + no sandbox)
ENV CHROME_DEFAULT_ARGS="--no-sandbox --disable-setuid-sandbox --headless=new --disable-gpu --disable-dev-shm-usage --no-zygote --no-first-run --ozone-platform=none --disable-features=UseOzonePlatform --enable-features=NetworkService,NetworkServiceInProcess"

# Env consumed by lowlighter/metrics to pass browser flags
ENV METRICS_BROWSER=chromium
ENV METRICS_BROWSER_HEADLESS=true
ENV METRICS_BROWSER_ARGS=""

# Optional: trust reverse proxy for express-rate-limit
ENV METRICS_TRUST_PROXY=1

# Copy sources and install JS deps
COPY package.json package-lock.json* ./
RUN npm ci

COPY . .

# Build the project
RUN npm run build

# Wrapper entrypoint to ensure args are always set
RUN printf '%s\n' \
'#!/usr/bin/env bash' \
'set -euo pipefail' \
'export PUPPETEER_EXECUTABLE_PATH="${PUPPETEER_EXECUTABLE_PATH:-/usr/bin/google-chrome-stable}"' \
'export METRICS_BROWSER="${METRICS_BROWSER:-chromium}"' \
'export METRICS_BROWSER_HEADLESS="${METRICS_BROWSER_HEADLESS:-true}"' \
'if [ -z "${METRICS_BROWSER_ARGS:-}" ]; then' \
'  export METRICS_BROWSER_ARGS="${CHROME_DEFAULT_ARGS}"' \
'fi' \
'exec npm start' \
> /usr/local/bin/metrics-entrypoint && chmod +x /usr/local/bin/metrics-entrypoint

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