#!/bin/bash
# Push LMS images to GitHub Container Registry (GHCR)
# Usage: ./push-ghcr.sh [tag]
# Reads GITHUB_USER and GITHUB_TOKEN from .env

set -e

cd "$(dirname "$0")"

# Load .env
if [ -f .env ]; then
  export $(grep -v '^#' .env | grep -E 'GITHUB_USER|GITHUB_TOKEN' | xargs)
fi

TAG="${1:-latest}"

GITHUB_USER="${GITHUB_USER:?GITHUB_USER not set in .env}"
GITHUB_TOKEN="${GITHUB_TOKEN:?GITHUB_TOKEN not set in .env}"

BACKEND_IMAGE="ghcr.io/${GITHUB_USER}/lms-backend:${TAG}"
FRONTEND_IMAGE="ghcr.io/${GITHUB_USER}/lms-frontend:${TAG}"

echo "========================================"
echo "  LMS → GHCR Push"
echo "  Backend : $BACKEND_IMAGE"
echo "  Frontend: $FRONTEND_IMAGE"
echo "========================================"
echo ""

# ── 1. Login to GHCR ──────────────────────────────────────────────────────────
echo "🔐 Logging in to ghcr.io ..."
echo "$GITHUB_TOKEN" | docker login ghcr.io -u "$GITHUB_USER" --password-stdin

# ── 2. Build images ───────────────────────────────────────────────────────────
echo ""
echo "🔨 Building images..."
cd "$(dirname "$0")"
docker compose build

# ── 3. Tag for GHCR ───────────────────────────────────────────────────────────
echo ""
echo "🏷  Tagging images..."
docker tag lms-backend:latest  "$BACKEND_IMAGE"
docker tag lms-frontend:latest "$FRONTEND_IMAGE"

# ── 4. Push ───────────────────────────────────────────────────────────────────
echo ""
echo "⬆  Pushing to GHCR..."
docker push "$BACKEND_IMAGE"
docker push "$FRONTEND_IMAGE"

echo ""
echo "✅ Done! Images pushed:"
echo "   $BACKEND_IMAGE"
echo "   $FRONTEND_IMAGE"
echo ""
echo "📋 Add these to .env on the target machine:"
echo "   BACKEND_IMAGE=$BACKEND_IMAGE"
echo "   FRONTEND_IMAGE=$FRONTEND_IMAGE"
echo ""
echo "🚀 On the target machine:"
echo "   docker compose pull && docker compose up -d"