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

fail() { printf '\nMacish failed: %s\n' "$*" >&2; exit 1; }
step() { printf '\n==> %s\n' "$*"; }
run() { printf '    %s\n' "$*"; "$@"; }
append_once() {
  local file="$1" line="$2"
  touch "$file"
  if ! grep -Fqx "$line" "$file"; then printf '\n%s\n' "$line" >>"$file"; fi
}

require_ready() {
  [[ "$(uname -s)" == "Darwin" ]] || fail "macOS is required."
  [[ "$EUID" -ne 0 ]] || fail "Run as your normal user, not with sudo."
  if [[ "${MACISH_YES:-${MACI_YES:-}}" != "1" && "${CI:-}" != "true" ]]; then
    if { exec 3<>/dev/tty; } 2>/dev/null; then
      printf '\nPress return to install, or Ctrl-C to stop. ' >&3
      read -r _ <&3 || fail "Confirmation cancelled."
      exec 3>&-
    else
      fail "No terminal for confirmation. Review the script, then set MACISH_YES=1 to run unattended."
    fi
  fi
  if ! xcode-select -p >/dev/null 2>&1; then
    xcode-select --install || true
    fail "Finish installing Xcode Command Line Tools, then run this script again."
  fi
}

ensure_homebrew() {
  local brew_bin brew_env installer line
  brew_bin="$(command -v brew || true)"
  if [[ -z "$brew_bin" ]]; then
    if [[ -x /opt/homebrew/bin/brew ]]; then
      brew_bin=/opt/homebrew/bin/brew
    elif [[ -x /usr/local/bin/brew ]]; then
      brew_bin=/usr/local/bin/brew
    else
      installer="$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)" || fail "Could not download Homebrew."
      if [[ -t 1 ]] && { true </dev/tty; } 2>/dev/null; then
        /bin/bash -c "$installer" </dev/tty || fail "Homebrew installation failed."
      else
        NONINTERACTIVE=1 /bin/bash -c "$installer" </dev/null || fail "Homebrew needs administrator access. Install it interactively, then rerun."
      fi
      if [[ -x /opt/homebrew/bin/brew ]]; then
        brew_bin=/opt/homebrew/bin/brew
      elif [[ -x /usr/local/bin/brew ]]; then
        brew_bin=/usr/local/bin/brew
      else
        fail "Homebrew was not found after installation."
      fi
    fi
  fi
  brew_env="$("$brew_bin" shellenv)" || fail "Could not load Homebrew's environment."
  eval "$brew_env"
  printf -v line 'eval "$(%q shellenv)"' "$brew_bin"
  append_once "$HOME/.zprofile" "$line"
}

ensure_formula() {
  if ! brew list --formula "$1" >/dev/null 2>&1; then run brew install "$1"; fi
}

printf '\nMacish / Ruby\nRuby 3.3, Bundler, Git, and mise. No database services.\n'
require_ready
step "Preparing Homebrew"
ensure_homebrew
step "Installing Git and mise"
ensure_formula git
ensure_formula mise
step "Installing Ruby"
run mise use --global ruby@3.3
append_once "$HOME/.zshrc" 'eval "$(mise activate zsh)"'
if ! mise exec ruby@3.3 -- bundle --version >/dev/null 2>&1; then
  run mise exec ruby@3.3 -- gem install bundler --no-document
fi
step "Verifying tools"
run mise exec ruby@3.3 -- ruby --version
run mise exec ruby@3.3 -- bundle --version
printf '\nDone. Open a new terminal to use Ruby.\n'