#!/bin/sh
set -eu

PROJECT_DIR=$(CDPATH= cd -- "$(dirname -- "$0")/.." && pwd)
cd "$PROJECT_DIR"

CONTAINER_ID=$(docker compose ps -q db)
if [ -z "$CONTAINER_ID" ]; then
    echo "Error: The MineSeeker PostgreSQL service is not running."
    exit 1
fi

DB_USER=$(docker inspect "$CONTAINER_ID" --format '{{range .Config.Env}}{{println .}}{{end}}' | sed -n 's/^POSTGRES_USER=//p')
DB_NAME=$(docker inspect "$CONTAINER_ID" --format '{{range .Config.Env}}{{println .}}{{end}}' | sed -n 's/^POSTGRES_DB=//p')

if [ -z "$DB_USER" ] || [ -z "$DB_NAME" ]; then
    echo "Error: Could not read PostgreSQL credentials from the db service."
    exit 1
fi

BACKUP_DIR=${1:-"$PROJECT_DIR/backups"}
mkdir -p "$BACKUP_DIR"
BACKUP_DIR=$(CDPATH= cd -- "$BACKUP_DIR" && pwd)
TIMESTAMP=$(date +%Y-%m-%d.%H%M%S)
BACKUP_FILE="mineseeker-postgres.${TIMESTAMP}.dump"
BACKUP_PATH="$BACKUP_DIR/$BACKUP_FILE"
TEMP_PATH="$BACKUP_PATH.tmp"

umask 077
trap 'rm -f "$TEMP_PATH"' EXIT

echo "Creating PostgreSQL backup: $BACKUP_PATH"
docker exec "$CONTAINER_ID" pg_dump \
    --username="$DB_USER" \
    --format=custom \
    --create \
    "$DB_NAME" > "$TEMP_PATH"

mv "$TEMP_PATH" "$BACKUP_PATH"
trap - EXIT
echo "Backup complete: $BACKUP_PATH"