#!/usr/bin/env ruby

require 'json'
require 'erb'
require 'pry'
require 'yaml'

verbose = ARGV.include? "-v"

binaries = YAML.load <<EOB
---
:skaffold:
  :url: https://storage.googleapis.com/skaffold/releases/<%= version %>/skaffold-linux-amd64
  :version: v0.17.0
  :version_argument: version
  :version_match: "<%= version %>"
:kubectl:
  :url: https://storage.googleapis.com/kubernetes-release/release/<%= version %>/bin/linux/amd64/kubectl
  :version: v1.15.1
  :version_argument: version --client
  :version_match: ^Client Version.*GitVersion:\"(?<version><%= version %>)\"
:kustomize:
  :url: https://github.com/kubernetes-sigs/kustomize/releases/download/v<%= version
    %>/kustomize_<%= version %>_linux_amd64
  :version: 2.0.3
  :version_argument: version
  :version_match: "^Version: {KustomizeVersion:(?<version><%= version %>) "
:yq:
  :url: https://github.com/mikefarah/yq/releases/download/<%= version %>/yq_linux_amd64
  :version: 2.1.1
  :version_argument: "--version"
  :version_match: "^yq version <%= version %>"
:lab:
  :url: https://github.com/zaquestion/lab/releases/download/v<%= version %>/lab_<%=
    version %>_linux_amd64.tar.gz
  :version: 0.14.0
  :version_argument: version
  :version_match: "^lab version <%= version %>"
:gopass:
  :url: https://github.com/gopasspw/gopass/releases/download/v<%= version %>/gopass-<%=
    version %>-linux-amd64.tar.gz
  :version: 1.8.6
  :version_argument: version
  :version_match: "^gopass <%= version %> "
:greenclip:
  :url: https://github.com/erebe/greenclip/releases/download/<%= version %>/greenclip
  :version: '3.1'
  :version_argument: version
  :version_match: "^greenclip v<%= version %>"
:packer:
  :url: https://releases.hashicorp.com/packer/<%= version %>/packer_<%= version %>_linux_amd64.zip
  :version: 1.3.5
  :version_argument: version
  :version_match: "^Packer v<%= version %>"
:minikube:
  :url: https://storage.googleapis.com/minikube/releases/v<%= version %>/minikube-linux-amd64
  :version: 0.33.1
  :version_argument: version
  :version_match: "^minikube version: v<%= version %>"
:terraform:
  :url: https://releases.hashicorp.com/terraform/<%= version %>/terraform_<%= version
    %>_linux_amd64.zip
  :version: 0.12.19
  :version_argument: version
  :version_match: "^Terraform v<%= version %>"
:vagrant:
  :url: https://releases.hashicorp.com/vagrant/<%= version %>/vagrant_<%= version
    %>_linux_amd64.zip
  :version: 2.2.5
  :version_argument: version
  :version_match: "^Installed Version: <%= version %>"
:helm:
  :url: https://get.helm.sh/helm-v<%= version %>-linux-amd64.tar.gz
  :version: 3.0.2
  :version_argument: "version --short"
  :version_match: v<%= version %>
:fzf:
  :url: https://github.com/junegunn/fzf-bin/releases/download/<%= version %>/fzf-<%=
    version %>-linux_amd64.tgz
  :version: 0.17.5
  :version_argument: "--version"
  :version_match: "<%= version %>.*"
:bat:
  :url: https://github.com/sharkdp/bat/releases/download/v<%= version %>/bat-v<%=
    version %>-x86_64-unknown-linux-gnu.tar.gz
  :version: 0.12.1
  :version_argument: "--version"
  :version_match: bat <%= version %>
:hcloud:
  :url: https://github.com/hetznercloud/cli/releases/download/v<%= version %>/hcloud-linux-amd64-v<%=
    version %>.tar.gz
  :version: 1.12.0
  :version_argument: version
  :version_match: v<%= version %>
:hugo:
  :url: https://github.com/gohugoio/hugo/releases/download/v<%= version %>/hugo_<%=
    version %>_Linux-64bit.tar.gz
  :version: 0.59.1
  :version_argument: version
  :version_match: Hugo Static Site Generator v<%= version %>
:pandoc:
  :url: https://github.com/jgm/pandoc/releases/download/<%= version %>/pandoc-<%=
    version %>-linux.tar.gz
  :version: 2.7.3
  :version_argument: "--version"
  :version_match: pandoc-citeproc 0.16.2
:hadolint:
  :url: https://github.com/hadolint/hadolint/releases/download/v<%= version %>/hadolint-Linux-x86_64
  :version: 1.17.2
  :version_match: "<%= version %>"
  :version_argument: "--version"
:shellcheck:
  :url: https://storage.googleapis.com/shellcheck/shellcheck-v<%= version %>.linux.x86_64.tar.xz
  :version: 0.7.0
  :version_match: "version: <%= version %>"
  :version_argument: "--version"
:wally-cli:
  :url: https://github.com/zsa/wally/releases/download/<%= version %>-linux/wally-cli
  :version: 1.1.0
  :version_match: "---"
:rancher:
  :url: https://github.com/rancher/cli/releases/download/v<%= version %>/rancher-linux-amd64-v<%= version %>.tar.gz
  :version: 2.3.0
  :version_match: "rancher version v<%= version %>"
  :version_argument: "--version"
:uni:
  :url: https://github.com/arp242/uni/releases/download/v<%= version %>/uni-v<%= version %>-linux-amd64.gz
  :version: 1.0.0
  :version_match: "v<%= version %>"
EOB
tmpdir = Dir.mktmpdir

binaries.each do |binary, download|
  target         = File.expand_path("~/bin/#{binary}")
  version        = download[:version]
  download_url   = ERB.new(download[:url]).result(binding)
  version_match  = Regexp.new(ERB.new(download[:version_match]).result(binding))
  version_string = "#{target} #{download[:version_argument]}"

  puts target

  if not download.has_key? :version_argument
    puts "→ Cannot check for version, no version_argument supplied"
  elsif File.executable? target and `#{version_string}`.match(version_match)
    puts "→ Already at #{version}"
  else
    puts "→ Installing #{binary} #{download[:version]}"
    File.unlink target if File.exists? target

    download_dir = File.join(tmpdir, binary.to_s)
    Dir.mkdir(download_dir)
    Dir.chdir(download_dir) do
      puts "Downloading from #{download_url} to #{download_dir}" if verbose
      system "curl -s -L -O #{download_url}"
      downloaded_file = Dir.glob("*").first
      puts "Downloaded as #{downloaded_file}" if verbose
      extraction_command = case File.basename(downloaded_file)
                           when /.tgz$/, /.tar.gz$/, /.tar.xz$/ then
                             "tar xvf"
                           when /.gz$/ then
                             "gunzip"
                           when /.zip$/ then
                             "unzip"
                           end

      if extraction_command
        puts "Using #{extraction_command} to extract" if verbose
        system("#{extraction_command} #{downloaded_file} > /dev/null")
      else
        puts "Did not find any archive I could extract"
      end

      extracted_executables = Dir.glob("**/**").select do |f| 
        `file #{f}`.match(/LSB executable|ELF 64-bit LSB shared object|ELF 64-bit LSB pie executable/)
      end
      FileUtils.mv(File.realpath(extracted_executables.first), target)
    end
    File.chmod(0755, target)
  end
end