#!/usr/bin/env bash
set -euo pipefail

SLUG="${1:-}"
if [[ -z "$SLUG" ]]; then
  echo "usage: deploy.sh <slug>" >&2
  exit 1
fi

ROOT="/var/www/sites/$SLUG"
LOG="/var/log/websites/deploy-$SLUG.log"
STATUS="/var/log/websites/deploy-$SLUG.status.json"
exec >>"$LOG" 2>&1

write_status() {
  local status="$1"
  local detail="${2:-}"
  detail="${detail//\\/\\\\}"
  detail="${detail//\"/\\\"}"
  detail="${detail//$'\n'/ }"
  detail="${detail:0:500}"
  printf '{"slug":"%s","status":"%s","detail":"%s","at":"%s"}\n' \
    "$SLUG" \
    "$status" \
    "$detail" \
    "$(date -u +%Y-%m-%dT%H:%M:%SZ)" \
    >"$STATUS"
}

echo "==== $(date -u +%Y-%m-%dT%H:%M:%SZ) deploy start: $SLUG ===="
write_status "started" "Deploy running"

cleanup_fail() {
  local code=$?
  write_status "failed" "deploy.sh exited with code $code"
  exit "$code"
}
trap cleanup_fail ERR

if [[ ! -d "$ROOT/.git" ]]; then
  echo "missing site: $ROOT"
  write_status "failed" "missing site directory"
  exit 1
fi

cd "$ROOT"
export GIT_SSH_COMMAND="${GIT_SSH_COMMAND:-ssh -i /root/.ssh/websites_deploy -o IdentitiesOnly=yes -o StrictHostKeyChecking=accept-new}"

git fetch origin

# Prefer origin/HEAD, then main, then master (repos may use either).
BRANCH=""
if git rev-parse --verify --quiet origin/HEAD >/dev/null; then
  BRANCH="$(git rev-parse --abbrev-ref origin/HEAD 2>/dev/null || true)"
  BRANCH="${BRANCH#origin/}"
fi
if [[ -z "$BRANCH" || "$BRANCH" == "HEAD" ]]; then
  if git rev-parse --verify --quiet origin/main >/dev/null; then
    BRANCH="main"
  elif git rev-parse --verify --quiet origin/master >/dev/null; then
    BRANCH="master"
  else
    echo "could not determine default branch (tried origin/HEAD, main, master)"
    write_status "failed" "no origin/main or origin/master"
    exit 1
  fi
fi

echo "resetting to origin/$BRANCH"
git checkout -B "$BRANCH" "origin/$BRANCH"
git reset --hard "origin/$BRANCH"

if [[ ! -f package.json ]]; then
  echo "package.json missing after checkout"
  write_status "failed" "package.json missing — empty or wrong branch?"
  exit 1
fi

npm ci
npm run build
pm2 restart "$SLUG" --update-env || pm2 start /var/www/sites/ecosystem.config.cjs --only "$SLUG"
pm2 save || true

echo "==== $(date -u +%Y-%m-%dT%H:%M:%SZ) deploy ok: $SLUG ===="
write_status "success" "Deployed origin/$BRANCH"
trap - ERR