#!/bin/bash

# Configuration
HOST="localhost"
PORT="5432"
USER="your_postgres_user"
BACKUP_PATH="/path/to/backup/directory"
DUMP_FORMAT="custom" # Set to "custom" for .dump or "sql" for plaintext SQL
EXTENSION="dump" # Default extension

# Adjust file extension based on dump format
if [[ "$DUMP_FORMAT" == "sql" ]]; then
  EXTENSION="sql.gz"
fi

# Create backup directory if it doesn't exist
mkdir -p "$BACKUP_PATH"

# Get a list of all databases, excluding template databases
DATABASES=$(psql -h "$HOST" -p "$PORT" -U "$USER" -d postgres -t -c "SELECT datname FROM pg_database WHERE datistemplate = false;")

# Loop over each database and create a backup
for DB in $DATABASES; do
  BACKUP_FILE="$BACKUP_PATH/$DB.$EXTENSION"
  
  if [[ "$DUMP_FORMAT" == "custom" ]]; then
    # Create a compressed custom-format backup
    pg_dump -h "$HOST" -p "$PORT" -U "$USER" -Fc "$DB" -f "$BACKUP_FILE"
  elif [[ "$DUMP_FORMAT" == "sql" ]]; then
    # Create a plain-text SQL backup and compress it with gzip
    pg_dump -h "$HOST" -p "$PORT" -U "$USER" "$DB" | gzip > "$BACKUP_FILE"
  else
    echo "Invalid DUMP_FORMAT specified: $DUMP_FORMAT"
    exit 1
  fi

  echo "Backup for database '$DB' created at '$BACKUP_FILE'"
done