#!/usr/bin/env bash
# Meant to run via the HOST's system crontab on each environment's box (not
# inside a container) — Gitea lives on a separate machine, so rather than
# exposing an inbound webhook receiver on staging/production, each box just
# polls its branch and redeploys when it moves. Silent when there's nothing
# new, so it's safe to run every couple of minutes from cron.
#
# Example crontab line (staging box):
#   */2 * * * * /srv/bookstore/deploy/poll-deploy.sh staging >> /var/log/bookstore-deploy.log 2>&1
set -euo pipefail

ENVIRONMENT="${1:?Usage: poll-deploy.sh <staging|production>}"
REPO_ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
cd "$REPO_ROOT"

case "$ENVIRONMENT" in
  staging)    BRANCH=staging ;;
  production) BRANCH=main ;;
  *) echo "environment must be 'staging' or 'production'" >&2; exit 1 ;;
esac

BEFORE="$(git rev-parse HEAD)"
git fetch origin "$BRANCH" --quiet
AFTER="$(git rev-parse "origin/${BRANCH}")"

if [[ "$BEFORE" == "$AFTER" ]]; then
  exit 0
fi

echo "$(date -Is) deploying ${ENVIRONMENT} (${BRANCH}): ${BEFORE:0:7} -> ${AFTER:0:7}"
git checkout -f "$BRANCH"
git reset --hard "origin/${BRANCH}"
"$REPO_ROOT/deploy/deploy.sh" "$ENVIRONMENT"