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

APP_NAME="chat-one-service"
APP_ROOT="${APP_ROOT:-/srv/chat-one-service}"
REPO_URL="${REPO_URL:-}"
BRANCH="${BRANCH:-main}"
KEEP_RELEASES="${KEEP_RELEASES:-5}"

if [[ -z "$REPO_URL" ]]; then
  echo "REPO_URL is required. Example:"
  echo "  REPO_URL=git@github.com:org/chat-one-service.git scripts/deploy.sh"
  exit 1
fi

command -v yarn >/dev/null 2>&1 || {
  echo "yarn is required"
  exit 1
}
command -v pm2 >/dev/null 2>&1 || {
  echo "pm2 is required"
  exit 1
}
command -v git >/dev/null 2>&1 || {
  echo "git is required"
  exit 1
}

RELEASES_DIR="$APP_ROOT/releases"
SHARED_DIR="$APP_ROOT/shared"
CURRENT_LINK="$APP_ROOT/current"
RELEASE_NAME="$(date +%Y%m%d_%H%M%S)"
RELEASE_DIR="$RELEASES_DIR/$RELEASE_NAME"

mkdir -p "$RELEASES_DIR" "$SHARED_DIR/logs"

echo "==> Cloning repository"
git clone --branch "$BRANCH" --depth 1 "$REPO_URL" "$RELEASE_DIR"

if [[ ! -f "$SHARED_DIR/.env" ]]; then
  echo "Missing $SHARED_DIR/.env"
  exit 1
fi

ln -sfn "$SHARED_DIR/.env" "$RELEASE_DIR/.env"

cd "$RELEASE_DIR"

echo "==> Installing dependencies"
yarn install --frozen-lockfile

echo "==> Building project"
yarn build

echo "==> Running database migrations"
npx prisma migrate deploy

echo "==> Switching current symlink"
ln -sfn "$RELEASE_DIR" "$CURRENT_LINK"

if pm2 describe "$APP_NAME" >/dev/null 2>&1; then
  echo "==> Reloading PM2 process"
  pm2 reload "$APP_NAME" --update-env
else
  echo "==> Starting PM2 process"
  pm2 start "$CURRENT_LINK/ecosystem.config.js" --env production
fi

echo "==> Smoke check"
curl -fsS "http://127.0.0.1:${PORT:-3000}/api/docs" >/dev/null

echo "==> Cleaning old releases (keep $KEEP_RELEASES)"
ls -1dt "$RELEASES_DIR"/* 2>/dev/null | tail -n +"$((KEEP_RELEASES + 1))" | xargs -r rm -rf

echo "Deploy success. Current release: $RELEASE_DIR"