#!/usr/bin/env bash
# entrypoint.sh — news-digest worker startup.
#
# Strategy:
#   1. If /output is empty, run digest.py once at start so the page
#      isn't blank while waiting for the next cron tick.
#   2. Start busybox crond in foreground so the container stays up.
#
# All env vars are inherited from compose, including TZ which busybox
# crond honors when computing fire times.

set -e

mkdir -p /output

# Sync static frontend assets from /app/templates → /output. The web
# container serves /output as static; the assets are baked into the
# image but the bind-mounted /output otherwise wouldn't pick up
# CSS/JS updates on rebuild without a manual copy.
for asset in style.css app.js favicon.svg; do
    if [ -f "/app/templates/$asset" ]; then
        cp -f "/app/templates/$asset" "/output/$asset"
    fi
done

if [ ! -f /output/index.html ]; then
    echo "[entrypoint] no /output/index.html yet — running first digest"
    /usr/local/bin/run-digest.sh || \
        echo "[entrypoint] first run failed; cron will retry on schedule"
fi

# Render the crontab from env so each per-user instance can fire on
# its own schedule. Defaults match the original singleton (0800 / 2000
# local). Two separate vars (AM / PM) instead of one combined string
# so users can tweak one fire without re-deriving the other.
CRON_AM="${DIGEST_CRON_AM:-0 8 * * *}"
CRON_PM="${DIGEST_CRON_PM:-0 20 * * *}"
mkdir -p /etc/crontabs
{
    echo "# news-digest cron — generated at container start from env."
    echo "$CRON_AM /usr/local/bin/run-digest.sh"
    echo "$CRON_PM /usr/local/bin/run-digest.sh"
} > /etc/crontabs/root
echo "[entrypoint] crontab:"
sed 's/^/  /' /etc/crontabs/root

# Foreground crond. -L /dev/stdout sends cron stdout/stderr to docker logs.
echo "[entrypoint] starting crond"
exec crond -f -L /dev/stdout -l 8