#!/bin/sh
# mac.sh - fresh-Mac bootstrap for 759705.cc
#
# Purpose   : Get a new Mac to a usable baseline - Xcode Command Line Tools,
#             Homebrew, and a short list of everyday CLI tools.
# Usage     : curl -fsSL https://759705.cc/mac.sh | sh
# Idempotent: yes. Every step checks whether it is already done and skips it,
#             so running this on an existing machine changes nothing.
# Dry run   : HUB_DRY_RUN=1 prints each command instead of running it.
#               HUB_DRY_RUN=1 sh mac.sh
# Local test: HUB_BASE overrides the base URL used in printed links.
#
# Installs only; never uninstalls, never deletes, never edits dotfiles.
# Contains no secrets and no internal hostnames; safe to serve publicly.

set -eu

# ---------------------------------------------------------------------------
# Edit this ONE line to change which Homebrew formulae get installed.
HUB_BREW_FORMULAE="git jq ripgrep fd tree"
# ---------------------------------------------------------------------------

HUB_BASE="${HUB_BASE:-https://759705.cc}"
HUB_DRY_RUN="${HUB_DRY_RUN:-0}"

log()  { printf '==>  %s\n' "$*"; }
ok()   { printf 'ok   %s\n' "$*"; }
note() { printf '     %s\n' "$*"; }
warn() { printf '!!   %s\n' "$*" >&2; }

# run <command string> - execute it, or print it when HUB_DRY_RUN=1.
run() {
  if [ "$HUB_DRY_RUN" = "1" ]; then
    printf 'DRY  %s\n' "$*"
  else
    log "$*"
    sh -c "$*"
  fi
}

# Summary counters, printed at the end.
HUB_CHANGED=0
HUB_PENDING=""

step_xcode_clt() {
  log "Step 1/3 - Xcode Command Line Tools"
  if xcode-select -p >/dev/null 2>&1; then
    ok "already installed at $(xcode-select -p)"
    return 0
  fi

  run "xcode-select --install"
  HUB_CHANGED=$((HUB_CHANGED + 1))
  if [ "$HUB_DRY_RUN" = "1" ]; then
    note "(dry run) the installer window would open here"
    return 0
  fi

  note "A macOS installer window has opened."
  note "Wait for it to finish, then re-run this script to continue:"
  note "  curl -fsSL ${HUB_BASE}/mac.sh | sh"
  HUB_PENDING="xcode-clt"
  return 0
}

step_homebrew() {
  log "Step 2/3 - Homebrew"
  if command -v brew >/dev/null 2>&1; then
    ok "already installed - $(brew --version 2>/dev/null | head -n 1)"
    return 0
  fi

  brew_cmd='/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"'
  if [ ! -t 0 ]; then
    # This script was piped into `sh`, so stdin is not a terminal and the
    # Homebrew installer cannot prompt for confirmation. Tell it not to.
    brew_cmd="NONINTERACTIVE=1 ${brew_cmd}"
  fi
  run "$brew_cmd"
  HUB_CHANGED=$((HUB_CHANGED + 1))

  if [ "$HUB_DRY_RUN" = "1" ]; then
    printf 'DRY  eval "$(/opt/homebrew/bin/brew shellenv)"   # Apple Silicon\n'
    return 0
  fi

  # Put brew on PATH for the rest of THIS run.
  for candidate in /opt/homebrew/bin/brew /usr/local/bin/brew; do
    if [ -x "$candidate" ]; then
      eval "$("$candidate" shellenv)"
      note "Add this to ~/.zprofile so brew stays on PATH in new shells:"
      note "  echo 'eval \"\$(${candidate} shellenv)\"' >> ~/.zprofile"
      break
    fi
  done

  if ! command -v brew >/dev/null 2>&1; then
    warn "Homebrew installed but 'brew' is still not on PATH. Open a new shell and re-run."
    HUB_PENDING="homebrew-path"
  fi
  return 0
}

step_formulae() {
  log "Step 3/3 - default formulae: ${HUB_BREW_FORMULAE}"

  if ! command -v brew >/dev/null 2>&1; then
    if [ "$HUB_DRY_RUN" = "1" ]; then
      printf 'DRY  brew install %s\n' "$HUB_BREW_FORMULAE"
      note "(dry run) brew is not on PATH here, so nothing could be compared"
      return 0
    fi
    warn "Skipping: brew is not available yet. Re-run after step 2 completes."
    HUB_PENDING="formulae"
    return 0
  fi

  installed="$(brew list --formula 2>/dev/null || true)"
  missing=""
  for formula in $HUB_BREW_FORMULAE; do
    if printf '%s\n' "$installed" | grep -qx "$formula"; then
      ok "${formula} already installed"
    else
      missing="${missing} ${formula}"
    fi
  done

  if [ -z "$missing" ]; then
    ok "nothing to install"
    return 0
  fi

  run "brew install${missing}"
  HUB_CHANGED=$((HUB_CHANGED + 1))
  return 0
}

summary() {
  printf '\n'
  log "Summary"
  if [ "$HUB_DRY_RUN" = "1" ]; then
    note "Dry run - nothing was installed or modified."
  elif [ "$HUB_CHANGED" -eq 0 ]; then
    note "Everything was already in place. No changes made."
  else
    note "${HUB_CHANGED} step(s) made changes."
  fi

  if [ -n "$HUB_PENDING" ]; then
    note "Unfinished: ${HUB_PENDING}. Re-run this script once it is resolved."
  fi
  note "Cheatsheet: ${HUB_BASE}/commands/mac/"
}

main() {
  log "hub mac bootstrap - $(sw_vers -productVersion 2>/dev/null || echo 'macOS')"
  if [ "$HUB_DRY_RUN" = "1" ]; then
    note "DRY RUN: commands are printed, not executed."
  fi
  printf '\n'
  step_xcode_clt
  printf '\n'
  step_homebrew
  printf '\n'
  step_formulae
  summary
}

main "$@"