#!/bin/bash

# print colored text
print_style() {

  if [ "$2" == "info" ]; then
    COLOR="96m"
  elif [ "$2" == "succ" ]; then
    COLOR="92m"
  elif [ "$2" == "warn" ]; then
    COLOR="95m"
  elif [ "$2" == "error" ]; then
    COLOR="91m"
  else
    COLOR="0m" #default color
  fi

  STARTCOLOR="\e[$COLOR"
  ENDCOLOR="\e[0m"

  printf "$STARTCOLOR%b$ENDCOLOR" "$1"
}

info() {
  print_style "$1" "info"
}

succ() {
  print_style "$1" "succ"
}

warn() {
  print_style "$1" "warn"
}

error() {
  print_style "$1" "error"
}

normal() {
  print_style "$1" "-"
}

die() {
  error "$1"
  exit 1
}

logo() {
  warn '======================================\n'
  warn '  _____ _   _             _           \n'
  warn ' |___  | |_| |__   __   _(_)_ __ ___  \n'
  warn '    / /| __| `_ \  \ \ / / | `_ ` _ \ \n'
  warn '   / / | |_| | | |  \ V /| | | | | | |\n'
  warn '  /_/   \__|_| |_|   \_/ |_|_| |_| |_|\n'
  warn '======================================\n'
}

help() {
  logo
  echo
  echo 'Usage: install.sh <Options>'
  echo
  echo 'Options:'
  echo '  -i -- install'
  echo '  -u -- update'
  echo '  -b -- remove config files and backup'
  echo '  -c -- check dependencies'
  echo '  -l -- show the list of supported languages'
  echo '  -h -- show help'
  echo
  exit 0
}

language_support_info() {
  info '-------------------------------------------------------------------\n'
  info 'Edit '
  succ '~/.vimrc.language'
  info ' to enable/disable language support you need.\n'
  info 'Supported languages:\n'
  normal '  - markdown\n'
  normal '  - html\n'
  normal '  - css\n'
  normal '  - js\n'
  normal '  - json\n'
  normal '  - php\n'
  normal '  - python\n'
  #normal '  - c/c++\n'
  normal '  - go\n'
  info '-------------------------------------------------------------------\n'
}

# check dependent
check() {
  E=0
  info '>> Checking Git ...'
  if which git >/dev/null; then
    succ '\t OK!\n'
  else
    E=1
    error '\t NO!\n'
    how_to git
  fi

  info '>> Checking Python ...'
  if which python3 >/dev/null; then
    succ '\t OK!\n'
  else
    E=1
    error '\t NO!\n'
    how_to python
  fi

  if [ $E -ne 0 ]; then
    warn '>>> The 7th-Vim '
    die 'install failed!\n'
  fi
}

how_to() {
  if [ $1 == git ]; then
    warn 'How to install Git:\n'
    info '- for macOS, refer to the following url:\n'
    normal 'https://git-scm.com/book/en/v2/Getting-Started-Installing-Git\n'
    info '- for Ubuntu\n'
    info '$ '
    normal 'sudo apt-get install -y git-all\n'
    info '- for CentOS\n'
    info '$ '
    normal 'sudo yum install -y git-all\n'
  elif [ $1 == python ]; then
    warn 'How to install Python:\n'
    info '- for macOS\n'
    info '$ '
    normal 'brew install python\n'
    info '- for Ubuntu\n'
    info '$ '
    normal 'sudo apt-get install -y python-dev python3-dev\n'
    info '- for CentOS\n'
    info '$ '
    normal 'sudo yum install -y python-devel python3-devel\n'
  fi
}

create_undo_dir() {
  mkdir -p ~/.vim/.undodir
}

install_backup() {
  # remove and backup old files
  info '>>> Remove and backup old files ...\n'
  mkdir -p ~/7th-vim-bak
  mv ~/.vimrc ~/7th-vim-bak
  mv ~/.vimrc.local ~/7th-vim-bak
  mv ~/.vimrc.plugins ~/7th-vim-bak
  mv ~/.vimrc.language ~/7th-vim-bak
}

update_backup() {
  # remove and backup old files
  info '>>> Remove and backup old files ...\n'
  mkdir -p ~/7th-vim-bak
  mv ~/.vimrc ~/7th-vim-bak
}

load_vimrc() {
  # download .vimrc file
  info '>>> Download .vimrc file ...\n'
  curl -fLo ~/.vimrc \
    https://raw.githubusercontent.com/dofy/7th-vim/master/vimrc

  # download .vimrc.language file
  if [ ! -f ~/.vimrc.language ]; then
    info '>>> Download .vimrc.language file ...\n'
    curl -fLo ~/.vimrc.language \
      https://raw.githubusercontent.com/dofy/7th-vim/master/vimrc.language
  fi

  # download .vimrc.plugins file
  if [ ! -f ~/.vimrc.plugins ]; then
    info '>>> Download .vimrc.plugins file ...\n'
    curl -fLo ~/.vimrc.plugins \
      https://raw.githubusercontent.com/dofy/7th-vim/master/vimrc.plugins
  fi

  # download .vimrc.local file
  if [ ! -f ~/.vimrc.local ]; then
    info '>>> Download .vimrc.local file ...\n'
    curl -fLo ~/.vimrc.local \
      https://raw.githubusercontent.com/dofy/7th-vim/master/vimrc.local
  fi
}

append_settings() {
  # append settings
  curl -f \
    https://raw.githubusercontent.com/dofy/7th-vim/master/vimrc.append \
    >>~/.vimrc
}

install_plugin() {
  # download vim-plug
  info '>>> Download vim-plug ...\n'
  curl -fLo ~/.vim/autoload/plug.vim --create-dirs \
    https://raw.githubusercontent.com/junegunn/vim-plug/master/plug.vim

  # install plugins
  info '>>> Install plugins ...\n'
  vim +PlugClean! +PlugUpdate +qal
}

update_plugin() {
  # update plugins
  info '>>> Update plugins ...\n'
  vim +PlugClean! +PlugUpdate +qal
}

run_install() {
  logo
  succ '>>> Thanks for Installing The 7th-Vim\n'
  check
  create_undo_dir
  install_backup
  load_vimrc
  install_plugin
  append_settings
  language_support_info
  succ '>>> DONE!\n\n'
}

run_update() {
  logo
  succ '>>> Thanks for Updating The 7th-Vim\n'
  create_undo_dir
  update_backup
  load_vimrc
  append_settings
  update_plugin
  language_support_info
  succ '>>> DONE!\n\n'
}

run_backup() {
  install_backup
  succ '>>> DONE!\n\n'
}

if [ $# -ne 1 ]; then
  help
fi

while getopts ":iubclh" opts; do
  case $opts in
  i)
    run_install
    ;;
  u)
    run_update
    ;;
  b)
    logo
    run_backup
    ;;
  c)
    logo
    check
    ;;
  l)
    logo
    language_support_info
    ;;
  h)
    help
    ;;
  :)
    help
    ;;
  ?)
    help
    ;;
  esac
done