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

### CONFIG ###
DATE=$(date +%F)
BASE_BACKUP_DIR="$HOME/backups/synapse"
BACKUP_DIR="$BASE_BACKUP_DIR/$DATE"

SYNAPSE_DIR="/opt/synapse"
SYNAPSE_DATA_DIR="/opt/synapse/synapse-data/_data"

POSTGRES_SERVICE="pg"
POSTGRES_DB="synapse"
POSTGRES_USER="matrix"

NGINX_DIR="/etc/nginx"
LETSENCRYPT_DIR="/etc/letsencrypt"

### PREP ###
mkdir -p "$BACKUP_DIR"

echo "📦 Synapse backup started"
echo "📅 Date: $DATE"
echo "📁 Backup dir: $BACKUP_DIR"
echo

cd "$SYNAPSE_DIR"

### 1️⃣ Stop ONLY Synapse
echo "⏸ Stopping ONLY Synapse service (Postgres stays running)..."
docker compose stop synapse
echo

### 2️⃣ PostgreSQL backup
echo "🗄 Backing up PostgreSQL database..."
docker compose exec -T "$POSTGRES_SERVICE" \
  pg_dump -U "$POSTGRES_USER" -Fc "$POSTGRES_DB" \
  > "$BACKUP_DIR/synapse-postgres.dump"
echo "✅ PostgreSQL backup done"
echo

### 3️⃣ Synapse data backup
echo "📁 Backing up Synapse data directory..."
tar -cJvf "$BACKUP_DIR/synapse-data.tar.xz" \
  -C "$SYNAPSE_DATA_DIR" .
echo "✅ Synapse data backup done"
echo

### 4️⃣ Docker Compose config (ONLY docker-compose.yml)
echo "🐳 Backing up docker-compose.yml..."
cp "$SYNAPSE_DIR/docker-compose.yml" \
   "$BACKUP_DIR/docker-compose.yml"
echo "✅ Docker Compose config backed up"
echo

### 5️⃣ Nginx backup
echo "🌐 Backing up Nginx config..."
tar -czvf "$BACKUP_DIR/nginx.tar.gz" \
  "$NGINX_DIR"
echo "✅ Nginx backup done"
echo

### 6️⃣ Let's Encrypt backup
#echo "🔐 Backing up Let's Encrypt certificates..."
#tar -czvf "$BACKUP_DIR/letsencrypt.tar.gz" \
#  "$LETSENCRYPT_DIR"
#echo "✅ Let's Encrypt backup done"
#echo

### 7️⃣ Start Synapse again
echo "▶ Starting Synapse service..."
docker compose up -d synapse
echo

### 8️⃣ Optional: Full combined archiveve (run with sudo)
echo "📦 Creating full backup archive..."
sudo tar -czvf "$BASE_BACKUP_DIR/full-backup-$DATE.tar.gz" \
  -C "$BASE_BACKUP_DIR" "$DATE"
echo "✅ Full archive created"
echo

echo "✅✅ Backup completed successfully"