#!/bin/bash
set -euo pipefail

echo "============================================"
echo "SDKMAN (Java Development) Installation Script"
echo "============================================"
echo ""
echo "This script will run the following commands with sudo:"
echo "  - apt-get update"
echo "  - apt-get install -y zip unzip curl"
echo ""
read -p "Continue with installation? (y/N) " -n 1 -r
echo
if [[ ! $REPLY =~ ^[Yy]$ ]]; then
    echo "Installation cancelled."
    exit 0
fi

echo ""
echo "Starting installation (commands will be shown as they run)..."
echo ""

# Enable command tracing
set -x

# Install prerequisites
sudo apt-get update
sudo apt-get install -y zip unzip curl

set +x

# Check if SDKMAN is already installed
if [ -d "$HOME/.sdkman" ]; then
    echo ""
    echo "============================================"
    echo "SDKMAN is already installed at ~/.sdkman"
    echo "To update SDKMAN, run: sdk selfupdate"
    echo "============================================"
    exit 0
fi

# Install SDKMAN
echo "Installing SDKMAN..."
set -x

if ! curl -s "https://get.sdkman.io" | bash; then
    set +x
    echo "Error: SDKMAN installation failed" >&2
    exit 1
fi

set +x

# Source SDKMAN to make it available in current session
export SDKMAN_DIR="$HOME/.sdkman"
[[ -s "$HOME/.sdkman/bin/sdkman-init.sh" ]] && source "$HOME/.sdkman/bin/sdkman-init.sh"

echo ""
echo "============================================"
# Verify installation
if [ -d "$HOME/.sdkman" ] && [ -f "$HOME/.sdkman/bin/sdkman-init.sh" ]; then
    echo "SDKMAN installed successfully!"
    echo ""
    echo "To start using SDKMAN, either:"
    echo "  1. Restart your shell, or"
    echo "  2. Run: source ~/.bashrc"
    echo ""
    echo "Then you can install Java with:"
    echo "  sdk list java              # List available Java versions"
    echo "  sdk install java           # Install latest Java"
    echo "  sdk install java 21.0.1-tem  # Install specific version"
    echo ""
    echo "Other useful SDKMAN commands:"
    echo "  sdk install gradle         # Install Gradle"
    echo "  sdk install maven          # Install Maven"
    echo "  sdk list                   # List all available SDKs"
else
    echo "Error: SDKMAN installation verification failed" >&2
    exit 1
fi
echo "============================================"