#!/bin/bash
# Linux startup script for turtlesim GUI

set -e

echo "Starting Turtlesim on Linux with GUI"
echo "========================================"

# Step 1: Check if X11 is available
if [[ -z "$DISPLAY" ]]; then
    echo "ERROR: DISPLAY variable not set"
    echo "X11 forwarding is required. Are you running in a GUI environment?"
    exit 1
fi

echo "Using DISPLAY: $DISPLAY"

# Step 2: Allow Docker to access X11
if command -v xhost >/dev/null 2>&1; then
    echo "Allowing Docker X11 access..."
    xhost +local:docker >/dev/null 2>&1 || {
        echo "WARNING: xhost command failed, trying without sudo..."
        xhost + >/dev/null 2>&1 || echo "WARNING: Could not run xhost, X11 forwarding may not work"
    }
else
    echo "WARNING: xhost not found. Install with: sudo apt-get install x11-xserver-utils"
    exit 1
fi

# Step 3: Export DISPLAY for Docker
echo "Docker will use DISPLAY=$DISPLAY"

# Step 4: Start the container
echo ""
echo "Starting Turtlesim container..."
echo "If successful, you should see a window with a turtle!"
echo ""

docker compose up turtlesim

echo ""
echo "Done! The turtle window should be visible on your screen."