#!/bin/bash
# Bootstrap for: bash -c "$(curl -fsSL dot.djmonta.me)"

trap 'e_error "Abort the command that is in progress"; exit 1' INT
trap 'e_error "Some error has occurred"; exit 1' ERR
set -e
set -u

cat <<-'EOT'

       __        __   ____ _  __
  ____/ /____   / /_ / __/(_)/ /___   _____
 / __  // __ \ / __// /_ / // // _ \ / ___/
/ /_/ // /_/ // /_ / __// // //  __/(__  )
\__,_/ \____/ \__//_/  /_//_/ \___//____/

*** WHAT'S INSIDE? ***
  1. Clone or update https://github.com/djmonta/dotfiles.git
  2. Install Determinate Nix if missing (optional)
  3. Apply nix-darwin + home-manager (macOS), or home-manager only
  4. Run etc/init/* (optional: bash -c "$(curl ...)" init)

See the README for documentation.
https://github.com/djmonta/dotfiles
Copyright (c) 2015 "Sachiko Miyamoto" aka @djmonta
Licensed under the MIT license.

EOT

e_newline() { printf "\n"; }
e_header()  { printf "\n\033[1m%s\033[0m\n" "$*"; }
e_success() { printf " \033[1;32m✔\033[0m  %s\n" "$*"; }
e_error()   { printf " \033[1;31m✖\033[0m  %s\n" "$*" 1>&2; }
e_arrow()   { printf " \033[1;34m➜\033[0m  %s\n" "$*"; }
is_exist()  { command -v "$1" >/dev/null 2>&1; }

DOTFILES=$HOME/dotfiles
export DOTFILES
REPO_URL='https://github.com/djmonta/dotfiles.git'

load_nix() {
  if [[ -e /nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh ]]; then
    # shellcheck disable=SC1091
    . /nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh
  fi
}

clone_or_update() {
  e_header 'Downloading dotfiles...'

  if [[ -d "$DOTFILES/.git" ]]; then
    e_arrow "$DOTFILES already exists, pulling..."
    git -C "$DOTFILES" pull --ff-only
  elif [[ -d "$DOTFILES" ]]; then
    e_error "$DOTFILES exists and is not a git repository"
    return 1
  elif is_exist git; then
    git clone --recursive "$REPO_URL" "$DOTFILES"
  else
    zip_url='https://github.com/djmonta/dotfiles/archive/master.zip'
    mkdir -p /tmp/$$ && cd /tmp/$$

    if is_exist curl; then
      curl -L -o dotfiles.zip "$zip_url"
    elif is_exist wget; then
      wget -O dotfiles.zip "$zip_url"
    else
      e_error 'not found downloader'
      return 1
    fi

    unzip dotfiles.zip
    mv dotfiles-master "$DOTFILES"
  fi

  e_success 'done'
}

ensure_nix() {
  load_nix
  if is_exist nix; then
    return 0
  fi

  e_header 'Installing Nix...'
  bash "$DOTFILES/etc/init/install_nix.sh"
  load_nix
}

deploy() {
  cd "$DOTFILES"
  e_header 'Deploying dotfiles...'

  if ! is_exist nix; then
    e_error 'nix not found; falling back to symlinks'
    if make deploy; then
      e_success 'done (symlinks)'
    fi
    return
  fi

  if [[ "$(uname)" == Darwin ]]; then
    if make darwin; then
      e_success 'done (nix-darwin + home-manager)'
      return 0
    fi
    e_error 'nix-darwin failed; falling back to home-manager'
  fi

  if make hm; then
    e_success 'done (home-manager)'
    return 0
  fi

  e_error 'home-manager failed; falling back to symlinks'
  if make deploy; then
    e_success 'done (symlinks)'
  fi
}

maybe_init() {
  if [[ "${1:-}" != 'init' ]]; then
    return 0
  fi

  e_header 'Initializing...'
  if make init; then
    e_success 'done'
  fi
}

installing_dotfiles() {
  clone_or_update
  ensure_nix
  deploy
  maybe_init "${1:-}"

  e_newline
  e_arrow 'Restarting your shell...'
  exec "${SHELL:-/bin/zsh}"
}

# Refuse a raw `./etc/install` unless called as `./etc/install directly`.
# The README one-liner (`bash -c "$(curl ...)"`) does not hit this.
if [[ "${0}" = "${BASH_SOURCE:-}" ]]; then
  e_error 'WARNING!!'
  e_error 'You should NOT run directly from the command line'
  e_error 'For more info, see https://github.com/djmonta/dotfiles'
  e_newline

  if [[ "${1:-}" != 'directly' ]]; then
    exit 1
  fi
  shift
fi

installing_dotfiles "${1:-}"
e_success 'All done'