module Pod
  class Lockfile
    def detect_changes_with_podfile(podfile)
      result = {}
      [:added, :changed, :removed, :unchanged].each { |k| result[k] = [] }

      installed_deps = {}
      dependencies.each do |dep|
        name = dep.root_name
        installed_deps[name] ||= dependencies_to_lock_pod_named(name)
      end

      installed_deps = installed_deps.values.flatten(1).group_by(&:name)

      podfile_dependencies = podfile.dependencies
      podfile_dependencies_by_name = podfile_dependencies.group_by(&:name)

      all_dep_names = (dependencies + podfile_dependencies).map(&:name).uniq
      all_dep_names.each do |name|
        installed_dep   = installed_deps[name]
        installed_dep &&= installed_dep.first

        # 需要将二进制版本的 specific_version 最后一位去掉，否则二进制下依赖解析很慢
        unless installed_dep.nil?
          installed_dep_version = installed_dep.specific_version.to_s
          if installed_dep_version.include?('bin')
            req_arr = installed_dep_version.split('.').delete_if { |r| r.include?('bin') }
            installed_dep_version = req_arr.join('.')
            installed_dep.specific_version = Pod::Version.create(installed_dep_version)
          end
        end

        podfile_dep     = podfile_dependencies_by_name[name]
        podfile_dep   &&= podfile_dep.first

        if installed_dep.nil?  then key = :added
        elsif podfile_dep.nil? then key = :removed
        elsif podfile_dep.compatible?(installed_dep) then key = :unchanged
        else key = :changed
        end
        result[key] << name
      end
      result
    end
  end
end