#!/usr/bin/env bash
set -euo pipefail

echo "Checking for Docker installation..."

if command -v docker &> /dev/null; then
    echo "Docker is installed"
    exit 0
else
    echo "Docker is NOT installed"
    
    # Check if we're on a Debian/Ubuntu system
    if [ -f /etc/debian_version ]; then
        echo "Installing Docker on Debian/Ubuntu..."
        sudo apt-get update
        sudo apt-get install -y ca-certificates curl gnupg lsb-release
        sudo mkdir -p /etc/apt/keyrings
        curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg
        echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
        sudo apt-get update
        sudo apt-get install -y docker-ce docker-ce-cli containerd.io docker-compose-plugin
        echo "Docker installation completed"
    else
        echo "Unsupported OS for automatic Docker installation"
        exit 1
    fi
fi

echo "Docker check completed"