#!/usr/bin/env ruby

$LOAD_PATH.unshift(File.expand_path("../../vendor/deps/cli-ui/lib", __FILE__))
require 'open3'
require 'fileutils'

def fmt(tag, msg)
  # Not really CLI::UI.fmt compatible: no nesting support, for example.
  # While we could pull in CLI::UI here, it makes it more difficult to
  # bootstrap a new project and to fix a broken vendor.
  fmt_msg = msg
    .gsub(/{{yellow:(.*?)}}/,     "\x1b[33m\\1\x1b[31m")
    .gsub(/{{green:(.*?)}}/,      "\x1b[32m\\1\x1b[31m")
    .gsub(/{{blue:(.*?)}}/,       "\x1b[34m\\1\x1b[31m")
    .gsub(/{{bold_blue:(.*?)}}/,  "\x1b[1;34m\\1\x1b[0;31m")
    .gsub(/{{bold_green:(.*?)}}/, "\x1b[1;32m\\1\x1b[0;31m")
  "\x1b[1;31m[#{tag}] \x1b[0;31m#{fmt_msg}\x1b[0m"
end

def bail(msg)
  STDERR.puts(fmt("ERROR", msg))
  exit(1)
end

def warn(msg)
  STDERR.puts(fmt("WARNING", msg))
end

def source_path
  File.expand_path(ENV.fetch('SOURCE_ROOT', File.expand_path('../../..', __FILE__)))
end

deps = %w(cli-ui cli-kit)

deps.each do |dep|
  path = File.expand_path(dep, source_path)

  unless Dir.exist?(path)
    bail(
      "dependency is not checked out: {{yellow:#{dep}}}.\n" \
      "  This repo {{bold_blue:(github.com/shopify/#{dep})}} must be cloned at" \
      " {{bold_blue:#{path}}} for this script to succeed.\n" \
      "  Currently, SOURCE_ROOT is set to {{bold_blue:#{source_path}}}.\n" \
      "  Alternatively, you can set {{bold_blue:SOURCE_ROOT}} to a directory containing {{yellow:#{dep}}}.\n" \
      "  {{bold_blue:SOURCE_ROOT}} defaults to {{bold_blue:../}}."
    )
  end

  head_sha = nil
  dirty = false

  Dir.chdir(path) do
    _, _, stat = Open3.capture3('git fetch origin master')
    bail("couldn't git fetch in dependency: {{yellow:#{dep}}}") unless stat.success?

    head_sha, stat = Open3.capture2('git rev-parse HEAD')
    bail("couldn't determine HEAD: {{yellow:#{dep}}}") unless stat.success?
    head_sha.chomp!

    fetch_head_sha, stat = Open3.capture2('git rev-parse FETCH_HEAD')
    bail("couldn't determine FETCH_HEAD: {{yellow:#{dep}}}") unless stat.success?
    fetch_head_sha.chomp!

    git_status, stat = Open3.capture2('git status --porcelain')
    bail("couldn't determine git status: {{yellow:#{dep}}}") unless stat.success?

    if head_sha != fetch_head_sha
      warn(
        "Copying files from {{yellow:#{path}}} to satisfy dependency {{yellow:#{dep}}}.\n" \
        "  However, the repo at {{yellow:#{path}}} isn't up to date.\n" \
        "  The checked-out revision is {{yellow:#{head_sha[0..8]}}}, and "\
        "{{yellow:origin/master}} is {{yellow:#{fetch_head_sha[0..8]}}}.\n" \
        "  Unless you know what you're doing, you should {{green:cd}} to that" \
        " repo and {{green:git pull}}, then run this again."
      )
    end

    unless git_status.chomp.empty?
      dirty = true
      warn("importing uncommitted changes from dependency: {{yellow:#{dep}}}")
    end
  end

  depdir = File.expand_path("../../vendor/deps/#{dep}", __FILE__)
  FileUtils.rm_rf(depdir)
  FileUtils.mkdir_p(depdir)
  dstlib = File.expand_path('lib', depdir)
  srclib = File.expand_path('lib', path)

  FileUtils.cp_r(srclib, dstlib)

  rev = head_sha
  rev << " (dirty)" if dirty
  rev << "\n"

  File.write("#{depdir}/REVISION", rev)
end
