# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at https://mozilla.org/MPL/2.0/.

# frozen_string_literal: true

require_relative '../config/config'
require_relative 'package'
require 'net/http'
require 'pathname'
require 'progressbar'
require 'term/ansicolor'

module SlackBuilder
  extend Rake::FileUtilsExt

  def self.clone(repo, tarball, tag_prefix = 'v')
    name_version = File.basename tarball, '.tar.xz'
    remote_path = tarball[tarball.index('/')..]

    if remote_file_exists?(remote_path)
      uri = URI hosted_sources(remote_path)

      return download(uri, "slackbuilds/#{tarball}").hexdigest
    end

    clone_and_archive repo, name_version, tarball, tag_prefix

    sh(*upload_command(tarball, remote_path))

    Digest::MD5.hexdigest File.read("slackbuilds/#{tarball}")
  end

  def self.download(uri, target)
    print Term::ANSIColor.green "Downloading #{uri} "
    checksum = nil

    Net::HTTP.start(uri.host, uri.port, use_ssl: uri.scheme == 'https') do |http|
      checksum = start_download uri, target, http
    end

    puts
    checksum
  end

  def self.hosted_sources(absolute_url)
    CONFIG[:download_url] + absolute_url
  end

  def self.remote_file_exists?(url)
    uri = URI hosted_sources(url)

    request = Net::HTTP.new uri.host, uri.port
    request.use_ssl = true
    response = request.request_head uri.path

    response.code.to_i == 200
  end

  def self.download_and_deploy(uri, tarball)
    remote_path = tarball[tarball.index('/')..]

    if remote_file_exists?(remote_path)
      uri = URI hosted_sources(remote_path)
      return download(uri, "slackbuilds/#{tarball}").hexdigest
    end

    checksum = download uri, "slackbuilds/#{tarball}"
    sh(*upload_command(tarball, remote_path))
    checksum.hexdigest
  end

  private_class_method def self.redirect_download(location, target)
    puts 'redirecting...'
    new_location = URI location

    download new_location, target
  end

  private_class_method def self.write_chunk(response, checksum, progressbar, io)
    response.read_body do |chunk|
      progressbar.progress += chunk.length
      io << chunk
      checksum << chunk
    end
  end

  private_class_method def self.write_download(target, response)
    checksum = Digest::MD5.new
    progressbar = ProgressBar.create title: target, total: response.header.content_length

    File.open target, 'w' do |io|
      write_chunk response, checksum, progressbar, io
    end
    progressbar.finish

    checksum
  end

  private_class_method def self.start_download(uri, target, http)
    request = Net::HTTP::Get.new uri

    http.request request do |response|
      case response
      when Net::HTTPRedirection
        return redirect_download response['location'], target
      else
        return write_download target, response
      end
    end
  end

  private_class_method def self.upload_command(local_path, remote_path)
    ['scp', "slackbuilds/#{local_path}", CONFIG[:remote_path] + remote_path]
  end

  private_class_method def self.clone_and_archive(repo, name_version, tarball, tag_prefix = 'v')
    _, _, version = name_version.rpartition '-'

    rm_rf name_version

    sh 'git', 'clone', repo, name_version
    sh 'git', '-C', name_version, 'checkout', "#{tag_prefix}#{version}"
    sh 'git', '-C', name_version, 'submodule', 'update', '--init', '--recursive'

    sh 'tar', 'Jcvf', "slackbuilds/#{tarball}", name_version
    rm_rf name_version
  end
end

def write_info(package, downloads:)
  File.write "slackbuilds/#{package.path}/#{package.name}.info",
    info_template(package, downloads)
end

def update_slackbuild_version(package_path, version)
  raise TypeError, %(expected a version string, got "#{version}") unless version.is_a?(String)

  name = package_path.split('/').last
  slackbuild_filename = "slackbuilds/#{package_path}/#{name}.SlackBuild"
  slackbuild_contents = File.read(slackbuild_filename)
    .gsub(/^VERSION=\${VERSION:-.+/, "VERSION=${VERSION:-#{version}}")

  File.open(slackbuild_filename, 'w') { |file| file.puts slackbuild_contents }
end

def commit(package_path, version)
  message = "#{package_path}: Updated for version #{version}"

  unless system('git', '-C', 'slackbuilds', 'checkout', CONFIG[:branch],
    err: '/dev/null')
    sh 'git', '-C', 'slackbuilds', 'checkout', '-b', CONFIG[:branch], 'master'
  end
  sh 'git', '-C', 'slackbuilds', 'add', package_path
  sh 'git', '-C', 'slackbuilds', 'commit', '-S', '-m', message
  # sh 'git', '-C', 'slackbuilds', 'push', 'origin', CONFIG[:branch]
end