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

# Fresh Mac setup. Safe to run via: curl -fsSL <url> | bash
# Installs iTerm2, Oh My Zsh, Node.js, and Fira Code if they are missing.
# Homebrew is installed first when needed.

if [[ "$(uname -s)" != "Darwin" ]]; then
  echo "new-setup.sh is meant for macOS." >&2
  exit 1
fi

log() {
  printf '%s\n' "$*"
}

already() {
  log "Already installed: $1"
}

ensure_brew() {
  if command -v brew >/dev/null 2>&1; then
    return
  fi

  if [[ -x /opt/homebrew/bin/brew ]]; then
    eval "$(/opt/homebrew/bin/brew shellenv)"
    return
  fi

  if [[ -x /usr/local/bin/brew ]]; then
    eval "$(/usr/local/bin/brew shellenv)"
    return
  fi

  log "Installing Homebrew..."
  NONINTERACTIVE=1 /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"

  if [[ -x /opt/homebrew/bin/brew ]]; then
    eval "$(/opt/homebrew/bin/brew shellenv)"
  elif [[ -x /usr/local/bin/brew ]]; then
    eval "$(/usr/local/bin/brew shellenv)"
  fi

  if ! command -v brew >/dev/null 2>&1; then
    echo "Homebrew installed, but brew is not on PATH. Open a new terminal and re-run." >&2
    exit 1
  fi
}

has_iterm() {
  [[ -d /Applications/iTerm.app ]] || [[ -d "${HOME}/Applications/iTerm.app" ]]
}

has_ohmyzsh() {
  [[ -d "${ZSH:-${HOME}/.oh-my-zsh}" ]]
}

has_node() {
  command -v node >/dev/null 2>&1
}

has_fira_code() {
  local found
  found="$(find "${HOME}/Library/Fonts" /Library/Fonts /opt/homebrew/share/fonts \
    -iname '*Fira*Code*' 2>/dev/null | head -n 1 || true)"
  [[ -n "$found" ]]
}

install_iterm() {
  if has_iterm; then
    already "iTerm2"
    return
  fi
  log "Installing iTerm2..."
  brew install --cask iterm2
}

install_ohmyzsh() {
  if has_ohmyzsh; then
    already "Oh My Zsh"
    return
  fi

  if ! command -v zsh >/dev/null 2>&1; then
    log "Installing zsh..."
    brew install zsh
  fi

  log "Installing Oh My Zsh..."
  RUNZSH=no CHSH=no KEEP_ZSHRC=yes \
    sh -c "$(curl -fsSL https://raw.githubusercontent.com/ohmyzsh/ohmyzsh/master/tools/install.sh)"
}

install_node() {
  if has_node; then
    already "Node.js ($(node -v))"
    return
  fi
  log "Installing Node.js..."
  brew install node
}

install_fira_code() {
  if has_fira_code; then
    already "Fira Code"
    return
  fi
  log "Installing Fira Code..."
  brew install --cask font-fira-code
}

log "Checking prerequisites..."
ensure_brew
brew update

install_iterm
install_ohmyzsh
install_node
install_fira_code

log "Done. New software is on this Mac if it was missing."