#!/usr/bin/env ruby

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

binaries = {
  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 %> ',
    extractor: lambda() do
      Dir.glob("gopass*/gopass")
    end
  },
  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: "0.12.2",
    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: "^Vagrant <%= version %>"
  },
  helm: {
    url: "https://storage.googleapis.com/kubernetes-helm/helm-v<%= version %>-linux-amd64.tar.gz",
    version: "2.13.0",
    version_argument: "--version",
    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: "0.10.0",
    version_argument: "--version",
    version_match: "v<%= 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: "0.55.6",
    version_argument: "version",
    version_match: "Hugo Static Site Generator v<%= version %>"
  },
}

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 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
      system "curl -s -L -O #{download_url}"
      downloaded_file = Dir.glob("*").first

      extraction_command = case File.extname(downloaded_file)
                           when ".tgz", ".tar.gz", ".gz" then
                             "tar xvf"
                           when ".zip" then
                             "unzip"
                           end
      system("#{extraction_command} #{downloaded_file} > /dev/null")
      extracted_executables = Dir.glob("**/**").select do |f| 
        `file #{f}`.match(/LSB executable|ELF 64-bit LSB shared object/)
      end
      FileUtils.mv(File.realpath(extracted_executables.first), target)
    end
    File.chmod(0755, target)
  end
end