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

APP_ROOT="${APP_ROOT:-/opt/desineuron-velocity-site}"
REPO_URL="${REPO_URL:-https://git.desineuron.in/sagnik/Project_Velocity.git}"
BRANCH="${BRANCH:-main}"
REPO_DIR="${REPO_DIR:-$APP_ROOT/repo}"
APP_DIR="${APP_DIR:-$REPO_DIR/app}"
BUILD_DIR="${BUILD_DIR:-$APP_DIR/dist}"
SERVE_ROOT="${SERVE_ROOT:-/var/www/velocity.desineuron.in}"
CURRENT_DIR="${CURRENT_DIR:-$SERVE_ROOT/current}"
STATE_DIR="${STATE_DIR:-$APP_ROOT/state}"
REVISION_FILE="${REVISION_FILE:-$STATE_DIR/current_revision.txt}"
PERSISTENT_VIDEO_DIR="${PERSISTENT_VIDEO_DIR:-$APP_ROOT/shared/videos}"

mkdir -p "$APP_ROOT" "$STATE_DIR" "$SERVE_ROOT" "$PERSISTENT_VIDEO_DIR"

if ! command -v git >/dev/null 2>&1; then
  echo "git is required" >&2
  exit 1
fi

if ! command -v npm >/dev/null 2>&1; then
  echo "npm is required" >&2
  exit 1
fi

if [ ! -d "$REPO_DIR/.git" ]; then
  git clone "$REPO_URL" "$REPO_DIR"
fi

git -C "$REPO_DIR" fetch --all --prune
git -C "$REPO_DIR" checkout "$BRANCH"
git -C "$REPO_DIR" reset --hard "origin/$BRANCH"

pushd "$APP_DIR" >/dev/null
if [ -f package-lock.json ]; then
  npm ci
else
  npm install
fi
npm run build
popd >/dev/null

rm -rf "$CURRENT_DIR"
mkdir -p "$CURRENT_DIR"
cp -a "$BUILD_DIR"/. "$CURRENT_DIR"/

if [ -d "$PERSISTENT_VIDEO_DIR" ] && [ "$(find "$PERSISTENT_VIDEO_DIR" -maxdepth 1 -type f | wc -l)" -gt 0 ]; then
  mkdir -p "$CURRENT_DIR/videos"
  cp -a "$PERSISTENT_VIDEO_DIR"/. "$CURRENT_DIR/videos"/
fi

git -C "$REPO_DIR" rev-parse HEAD > "$REVISION_FILE"
date -u +"%Y-%m-%dT%H:%M:%SZ" > "$STATE_DIR/last_deploy_utc.txt"

echo "Deployed revision $(cat "$REVISION_FILE") to $CURRENT_DIR"