#!/bin/bash
# Git + SSH onboarding script for developer environments.
# Prompts for missing git config, sets recommended options, and helps create and test SSH keys.
# Author: [ilia] | Created: [Aug 28, 2025]

set -euo pipefail  # Exit on error, unset vars, and in pipe failures

## FUNCTIONS

# Prompt for and set global git config if missing
set_git_config() {
  local key="$1"
  local prompt="$2"
  if ! git config --get "user.${key}" &>/dev/null; then
    read -rp "$prompt" value
    git config --global "user.${key}" "$value"
  fi
}

# Create ed25519 SSH key if missing
setup_ssh_key() {
  if [ ! -f ~/.ssh/id_ed25519 ]; then
    read -rp "No ed25519 SSH key found! Create one for Git usage? (y/n): " sshyn
    if [[ "$sshyn" =~ ^[Yy]$ ]]; then
      ssh-keygen -t ed25519 -C "$(git config --get user.email)"
    fi
  fi
}

# Show public SSH key and copy to clipboard
show_and_copy_ssh_key() {
  if [ -f ~/.ssh/id_ed25519.pub ]; then
    echo "Your public ed25519 SSH key:"
    cat ~/.ssh/id_ed25519.pub
    if command -v xclip &>/dev/null; then
      xclip -sel clip < ~/.ssh/id_ed25519.pub
      echo "Public key copied to clipboard."
    fi
    echo "Add this key to Gitea: http://10.0.30.169:3000/user/settings/keys"
  else
    echo "No public ed25519 SSH key found. You might need to generate it."
  fi
}

# SSH connection test
test_ssh_connection() {
  read -rp "Test SSH connection to Gitea server? (y/n): " testssh
  if [[ "$testssh" =~ ^[Yy]$ ]]; then
    ssh -T gitvm@10.0.30.169
  fi
}

## MAIN LOGIC

echo "Checking Git global config..."
set_git_config "name" "Enter your Git user name: "
set_git_config "email" "Enter your Git email: "

# Set best-practice Git global defaults
git config --global credential.helper cache
git config --global color.ui auto

echo
echo "Current global Git configuration:"
git config --global --list

setup_ssh_key
show_and_copy_ssh_key
test_ssh_connection

echo
echo "Setup complete!"