module Watchable
  extend ActiveSupport::Concern

  included do
    has_many :watchers, as: :watchable, dependent: :destroy
    has_many :watcher_users, through: :watchers, source: :user, validate: false

    scope :watched_by, -> (user_id) { includes(:watchers).where(watchers: { user_id: user_id }) }
    scope :following, -> (user_id) { watched_by(user_id) }
  end

  def watched?(watchable)
    watchable.watchers.exists?(user: self)
  end

  def watch!(watchable)
    watchable.watchers.create!(user: self, created_at: Time.current)
  end

  def unwatch!(watchable)
    obj = watchable.watchers.find_by(user: self)
    obj.destroy! if obj.present?
  end

  # 我正在关注的、我追随的
  def following
    User.following(self.id)
  end

  def following_count
    following.size
  end

  def simple_contribution_perc(project, perc=nil)
    @project = project
    @user = self

    def cal_perc(count_user, count_all)
      (count_user * 1.0 / (count_all + 0.000000001)).round(5)
    end

    if Site.has_blockchain? && (@project['use_blockchain'] == true or @project['use_blockchain'] == 1) && @user.id.present?
      balance_user = Blockchain::BalanceQueryOneProject.call({"user_id": @user.id, "project_id": @project.id})
      balance_all = Blockchain::RepoBasicInfo.call({"project_id": @project.id})["cur_supply"]
      score = cal_perc(balance_user, balance_all)
      score = (score * 100).round(1).to_s + "%"
    else
      score = perc
    end

    score
  end

  def contribution_perc(project)
    @project = project
    @user = self

    def cal_perc(count_user, count_all)
      (count_user * 1.0 / (count_all + 0.000000001)).round(5)
    end

    if @project['use_blockchain'] == true or @project['use_blockchain'] == 1
      balance_user = Blockchain::BalanceQueryOneProject.call({"user_id": @user.id, "project_id": @project.id})
      balance_all = Blockchain::RepoBasicInfo.call({"project_id": @project.id})["cur_supply"]
      score = cal_perc(balance_user, balance_all)
    else
      # 获取所有行为对应的项目内记录总数和个人记录数
      features = {
        "requirement" => {},
        "development" => {},
        "review" => {}
      }

      # 1. issue创建
      issues = Issue.where(project_id: @project.id, issue_classify: 'issue')
      issue_all = issues.count
      issue_user = issues.where(author_id: @user.id).count
      features["requirement"] = features["requirement"].merge({"issue" => {"all" => issue_all, "perc" => cal_perc(issue_user, issue_all)}})
      # 2. 里程碑创建
      milestones = Version.where(project_id: @project.id)
      milestone_all = milestones.count
      milestone_user = milestones.where(user_id: @user.id).count
      features["requirement"] = features["requirement"].merge({"milestone" => {"all" => milestone_all, "perc" => cal_perc(milestone_user, milestone_all)}})
      # 3. issue评论
      issue_comments = Journal.joins("INNER JOIN issues on journals.journalized_id=issues.id").where("issues.project_id=#{@project.id} and journalized_type='Issue' and issues.issue_classify='issue'")
      issue_comment_all = issue_comments.count
      issue_comment_user = issue_comments.where("journals.user_id=#{@user.id}").count
      features["requirement"] = features["requirement"].merge({"issue_comment" => {"all" => issue_comment_all, "perc" => cal_perc(issue_comment_user, issue_comment_all)}})
      # 4. 合并请求
      prs = PullRequest.where(project_id: @project.id)
      pr_all = prs.count
      pr_user = prs.where(user_id: @user.id).count
      features["development"] = features["development"].merge({"pr" => {"all" => pr_all, "perc" => cal_perc(pr_user, pr_all)}})
      # 5. pr评论
      pr_comments = Journal.joins("INNER JOIN issues on journals.journalized_id=issues.id").where("issues.project_id=#{@project.id} and journalized_type='Issue' and issues.issue_classify='pull_request'")
      pr_comment_all = pr_comments.count
      pr_comment_user = pr_comments.where("journals.user_id=#{@user.id}").count
      features["review"] = features["review"].merge({"pr_comment" => {"all" => pr_comment_all, "perc" => cal_perc(pr_comment_user, pr_comment_all)}})
      # 6. 代码行评论
      line_comments = Journal.joins("INNER JOIN pull_requests on journals.journalized_id=pull_requests.id").where("pull_requests.project_id=#{@project.id} and journalized_type='PullRequest'")
      line_comment_all = line_comments.count
      line_comment_user = line_comments.where("journals.user_id=#{@user.id}").count
      features["review"] = features["review"].merge({"line_comment" => {"all" => line_comment_all, "perc" => cal_perc(line_comment_user, line_comment_all)}})
      # 7. 代码行、commit贡献统计
      code_contributions = Api::V1::Projects::CodeStats::ListService.call(@project, {ref: nil})
      commit_all = code_contributions["commit_count"]
      addition_all = code_contributions["additions"]
      deletion_all = code_contributions["deletions"]

      commit_user = 0
      addition_user = 0
      deletion_user = 0
      code_contributions["authors"].each do |author|
        if author["name"] == @user.login
          commit_user = author["commits"]
          addition_user = author["additions"]
          deletion_user = author["deletions"]
        end
      end

      features["development"] = features["development"].merge({"commit" => {"all" => commit_all, "perc" => cal_perc(commit_user, commit_all)}})
      features["development"] = features["development"].merge({"addition" => {"all" => addition_all, "perc" => cal_perc(addition_user, addition_all)}})
      features["development"] = features["development"].merge({"deletion" => {"all" => deletion_all, "perc" => cal_perc(deletion_user, deletion_all)}})

      def cal_weight(features)
        weights = {} # 计算每一项的权重
        categories = []
        features.each do |key, _|
          categories << key
          weights[key] = Hash.new
        end
        count_all = 0
        counts = {}
        categories.each do |category|
          count_1 = 0
          features[category].each do |_, value|
            count_1 += value["all"]
          end
          count_all += count_1
          counts[category] = count_1
          features[category].each do |key, value|
            weight = cal_perc(value["all"], count_1)
            weights[category] = weights[category].merge({key => weight})
          end
        end
        categories.each do |category|
          weight = cal_perc(counts[category], count_all)
          weights[category] = weights[category].merge({"category_weight" => weight})
        end
        return weights
      end

      weights_categories = cal_weight(features)
      score = 0.0
      features.each do |category, value_1|
        category_score = 0.0
        value_1.each do |action, value_2|
          category_score += weights_categories[category][action] * value_2["perc"]
        end
        score += weights_categories[category]["category_weight"] * category_score.round(4)
      end
    end
    score
    (score * 100).round(1).to_s + "%"
  end

  # 关注我的、我的粉丝、我的追随者
  def followers
    watcher_users
  end

  def followers_count
    followers.size
  end

  module ClassMethods
  end
end