#!/usr/bin/env ruby

DEFAULT_ORG = "buildkite"
REPO_BASE   = "#{ENV['HOME']}/repos"

def clone(repo_url, destination)
  spinner_command = %Q[gum spin --show-output --spinner dot]
  git_command = ['git', 'clone', repo_url, destination].join(' ')
  system("#{spinner_command} -- #{git_command}")
end

def print_error(message)
  system(%Q[gum style --bold --border=double --padding='0 1' --foreground 212 "#{message}"])
end

def repo_url(repo_str)
  ## GitHub HTTPS. We like these, use it as-is.
  if repo_str =~ /^(git|https)\:\/\/github\.com\//
    repo_str
  ## GitHub SSH. Let's convert this to HTTPS.
  elsif repo_str =~ /^git@github\.com\:.+\.git$/
    repo_str.sub(/^git@github\.com:/, 'https://github.com/')
  # Host, user/org and repo. Assume it's HTTPS.
  elsif repo_str =~ /^[^\/\s]+\/[^\/\s]+\/[^\/\s]+/
    "https://#{repo_str}#{repo_str.end_with?('.git') ? '' : '.git'}"
  # Just a user/org name and repo name. Assume it's on GitHub and make an HTTPS URL.
  elsif repo_str =~ /^[\w\-_]+\/[\w\-_\.]+$/
    "https://github.com/#{repo_str}.git"
  # Just a repo name. Assume it's a DEFAULT_ORG repo on GitHub and make an HTTPS URL.
  elsif repo_str =~ /^[\w\-_\.]+$/
    "https://github.com/#{DEFAULT_ORG}/#{repo_str}.git"
  else
    raise "I can't make a repo URL out of '#{repo_str}'."
  end
end

def destination_path(repo_str)
  repo_elms = repo_str.split('/')

  repo  = repo_elms.pop.sub(/\.git$/, '')
  org   = repo_elms.pop || DEFAULT_ORG
  forge = repo_elms.pop || 'github.com'

  File.join(forge, org, repo)
end

destination = ARGV[1] || destination_path(ARGV[0])
full_dest = File.join(REPO_BASE, destination)

clone_url = repo_url(ARGV[0])

if Dir.exist?(full_dest)
  log_error "#{destination} already exists. Doing nothing."
else
  clone(clone_url, full_dest)
end