#!/bin/bash
# install_docker_wsl.sh
# Script to install Docker Engine on WSL2 Ubuntu (24.04 Noble)

set -e

echo "=== Starting Docker Engine Installation on WSL2 Ubuntu ==="

# 1. Update package index
echo "Updating package index..."
sudo apt-get update -y

# 2. Install prerequisites
echo "Installing prerequisites..."
sudo apt-get install -y ca-certificates curl gnupg

# 3. Add Docker GPG Key
echo "Adding Docker's official GPG key..."
sudo install -m 0755 -d /etc/apt/keyrings
sudo curl -fsSL https://download.docker.com/linux/ubuntu/gpg -o /etc/apt/keyrings/docker.asc
sudo chmod a+r /etc/apt/keyrings/docker.asc

# 4. Add Docker repository to Apt sources
echo "Adding Docker repository to Apt sources..."
echo \
  "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.download.com/linux/ubuntu \
  $(. /etc/os-release && echo "$VERSION_CODENAME") stable" | \
  sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

# Fix the domain to official docker
sudo sed -i 's/download.download.com/download.docker.com/g' /etc/apt/sources.list.d/docker.list

# 5. Update package index again
echo "Updating package index with Docker repository..."
sudo apt-get update -y

# 6. Install Docker packages
echo "Installing Docker Engine, CLI, Containerd, and Compose..."
sudo apt-get install -y docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin

# 7. Start and enable Docker service (via systemd)
echo "Starting and enabling Docker service..."
sudo systemctl enable docker
sudo systemctl start docker

# 8. Verification
echo "Verifying installation..."
docker --version
docker compose version

# 9. Test run
echo "Running hello-world container..."
sudo docker run --rm hello-world

echo "=== Docker Engine Installation Completed Successfully ==="