#!/usr/bin/env bash

trap 'leave_context' INT EXIT

DEFAULT_CONFIGURATION_DIRECTORY="$HOME/src"
DEFAULT_SETUP_DIRECTORY="${DEFAULT_CONFIGURATION_DIRECTORY}/setup"
FORCE="${FORCE:-false}"

clone_dotfiles() {
  if test -d "$DEFAULT_SETUP_DIRECTORY" && test "$FORCE" != "true"
  then
    if $(dirname "$0" | grep -qi -- 'src/setup')
    then
      return 0
    fi
    >&2 echo "ERROR: Setup directory already exists at $DEFAULT_SETUP_DIRECTORY. Delete the \
directory and try again."
    return 1
  fi
  if ! test -d "$DEFAULT_SETUP_DIRECTORY"
  then
    git clone https://github.com/carlosonunez/bash-dotfiles $DEFAULT_SETUP_DIRECTORY
  fi
}

set_context() {
  pushd $DEFAULT_SETUP_DIRECTORY
}

leave_context() {
  if test "${#DIRSTACK[@]}" -gt 1
  then
    popd &>/dev/null
  fi
}

install_homebrew() {
  if ! which brew &>/dev/null
  then
    "$(dirname $0)/install_homebrew.sh"
  fi
}

check_for_required_directories() {
for required_directory in "$DEFAULT_CONFIGURATION_DIRECTORY" "$DEFAULT_SETUP_DIRECTORY"
do
  if [ ! -d "$required_directory" ]
  then
    >&2 echo "ERROR: Configuration directory not present: $required_directory"
    return 1
  fi
done
}

create_symlinks_for_config_files() {
  all_bash_files=$(find $(dirname $0) -maxdepth 1 -type f -name ".bash_*" -exec basename {} \;)
  for managed_file in $all_bash_files '.vim' '.tmux.conf' '.vimrc'
  do
    symlink_path="${HOME}/$managed_file"
    target_path="${DEFAULT_SETUP_DIRECTORY}/$managed_file"
    if test -L "$symlink_path"
    then
      >&2 echo "INFO: Symlink exists: $symlink_path"
    else
      /usr/bin/env ln -sf "$target_path" "$symlink_path" || true
    fi
  done
}

tell_user_what_to_do_next() {
  if [ "$?" == "0" ]
  then
    echo 'Setup complete! Run this to get started: source $HOME/.bash_profile'
  fi
}

create_vim_directories() {
  for vim_directory in 'swap' 'backup'
  do
    mkdir -pv "${DEFAULT_SETUP_DIRECTORY}/.vim/$vim_directory"
  done
}

create_symlinks_for_tuir() {
  mkdir -p ~/.config/tuir &&
    ln -sf "${DEFAULT_SETUP_DIRECTORY}/tuir_configs/tuir.cfg" ~/.config/tuir/tuir.cfg || true &&
    ln -sf "${DEFAULT_SETUP_DIRECTORY}/tuir_configs/.mailcap" ~/.mailcap || true &&
    ln -sf "${DEFAULT_SETUP_DIRECTORY}/.x11run" ~/.x11run || true
}

create_symlinks_for_w3m() {
  mkdir -p ~/.w3m &&
    ln -sf "${DEFAULT_SETUP_DIRECTORY}/w3m.config" ~/.w3m/config || true
}

create_symlinks_for_rvm() {
  ln -sf "${DEFAULT_SETUP_DIRECTORY}/.rvmrc" "$HOME/.rvmrc" || true
}

create_gpg_symlinks() {
  test -d "$HOME/.config/gnupg" || mkdir -p "$HOME/.config/gnupg"
  ln -sf "${DEFAULT_SETUP_DIRECTORY}/gpg-agent.conf" "$HOME/.config/gnupg/gpg-agent.conf"
}

create_asdf_symlinks() {
  ln -sf "${DEFAULT_SETUP_DIRECTORY}/.tool-versions" "$HOME/.tool-versions"
  for file in "${DEFAULT_SETUP_DIRECTORY}"/.default-*
  do
    fname=$(basename "$file")
    ln -sf "$file" "${HOME}/$fname"
  done
}

create_container_engine_symlinks() {
  for file in "${DEFAULT_SETUP_DIRECTORY}"/.bash_container_engine*
  do
    fname=$(basename "$file")
    ln -sf "$file" "${HOME}/$fname"
  done
}

if {
  clone_dotfiles &&
  set_context &&
  install_homebrew &&
  check_for_required_directories &&
  create_symlinks_for_config_files &&
  create_vim_directories &&
  create_gpg_symlinks &&
  create_asdf_symlinks &&
  create_container_engine_symlinks &&
  leave_context
}
then
  tell_user_what_to_do_next
else
  >&2 echo "ERROR: Something went wrong. Fix that thing, then try again."
  exit 1
fi