#!/bin/bash
set -e

# =============================================================
# PasteVault - backup.sh
# Dumps the PostgreSQL database and uploads to Azure Blob Storage.
#
# Prerequisites:
#   - postgresql-client installed (sudo apt install postgresql-client)
#   - Azure CLI installed and logged in
#   - .env file present with DB_PASS set
#
# Usage:
#   cd sk1/
#   bash scripts/backup.sh
# =============================================================

source .env

DB_HOST="pastevault-db.postgres.database.azure.com"
DB_USER="pvadmin"
DB_NAME="pastevault"
STORAGE_ACCOUNT="pastevaultstorage"
CONTAINER="backups"
TIMESTAMP=$(date +%Y%m%d_%H%M%S)
BACKUP_FILE="pastevault_backup_${TIMESTAMP}.sql"
TMP_PATH="/tmp/$BACKUP_FILE"

echo "🔄 PasteVault Backup — $TIMESTAMP"
echo ""

# Check pg_dump is available
if ! command -v pg_dump &> /dev/null; then
  echo "Installing postgresql-client..."
  sudo apt-get install -y postgresql-client -qq
fi

# Dump the database
echo "1/2 — Dumping PostgreSQL database..."
PGPASSWORD="$DB_PASS" pg_dump \
  --host=$DB_HOST \
  --username=$DB_USER \
  --dbname=$DB_NAME \
  --no-password \
  --clean \
  --if-exists \
  --file=$TMP_PATH \
  --sslmode=require

echo "     ✅ Dump complete: $BACKUP_FILE ($(du -sh $TMP_PATH | cut -f1))"

# Upload to Azure Blob Storage
echo ""
echo "2/2 — Uploading to Azure Blob Storage..."
az storage blob upload \
  --account-name $STORAGE_ACCOUNT \
  --container-name $CONTAINER \
  --name $BACKUP_FILE \
  --file $TMP_PATH \
  --overwrite \
  --output none

rm $TMP_PATH

echo "     ✅ Upload complete"
echo ""
echo "✅ Backup saved: $BACKUP_FILE"
echo ""
echo "   List all backups:"
echo "   az storage blob list --account-name $STORAGE_ACCOUNT --container-name $CONTAINER -o table"
echo ""
echo "   Download a backup:"
echo "   az storage blob download --account-name $STORAGE_ACCOUNT --container-name $CONTAINER --name $BACKUP_FILE --file ./restore.sql"