#!/bin/bash
set -e

# -----------------------------
# INPUTS
# -----------------------------
CONTAINER_NAME="54e"
DB_PORT="5432"
DB_NAME="mytestdb"

# -----------------------------
# VALIDATION
# -----------------------------
if [ -z "$CONTAINER_NAME" ] || [ -z "$DB_PORT" ] || [ -z "$DB_NAME" ]; then
  echo "Usage: $0 <container_name> <port> <db_name>"
  exit 1
fi

# -----------------------------
# CONFIG
# -----------------------------
PG_USER="postgres"
BACKUP_DIR="./backups"
DATE_STR=$(date +"%d_%m_%Y")
BACKUP_FILE="${DB_NAME}_${DATE_STR}.dump"

mkdir -p "$BACKUP_DIR"

# -----------------------------
# BACKUP
# -----------------------------
echo "Taking custom-format backup (.dump) of '$DB_NAME' from container '$CONTAINER_NAME'..."

docker exec "$CONTAINER_NAME" \
  pg_dump \
    -U "$PG_USER" \
    -p "$DB_PORT" \
    -Fc \
    -Z 6 \
    "$DB_NAME" > "$BACKUP_DIR/$BACKUP_FILE"

echo "Backup completed successfully:"
echo "$BACKUP_DIR/$BACKUP_FILE"