# 如果你对改模块任何功能不清楚，请不要随便改
# @Hjqreturn
class PullRequestsController < ApplicationController
  before_filter :authorize_logged
  before_filter :find_project_and_repository
  before_filter :connect_gitlab, :only => [:index, :show, :create, :accept_pull_request, :pull_request_commits, :pull_request_changes, :new,
                                              :update_pull_request, :pull_request_comments, :create_pull_request_comment, :compare_pull_request]

  layout "base_projects"
  include PullRequestsHelper
  include ApplicationHelper

  # 返回json格式
  def index
    # project_menu_type 为了控制base顶部导航
    @project_menu_type = 6
    # 不符合pullrequest条件的给出提示
    @allow_to_pull_request = allow_pull_request(@project) > 0

    type = params[:type]
    merge_requests = @g.merge_requests(@project.gpid)
    merge_requests_count = merge_requests.count
    case type
      when nil, "1"
        @requests = merge_requests.select{|request| request.state == "opened" || request.state == "reopened"}
        # 更新统计数字
        project_score = @project.project_score.update_column(:pull_request_num, merge_requests_count)
      when "2"
        @requests = merge_requests.select{|request| request.state == "merged"}
      when "3"
        @requests = merge_requests.select{|request| request.state == "closed"}
    end
    @requests_opened_count = @requests.count
    @requests_merged_count = merge_requests.select{|request| request.state == "merged"}.count
    @requests_closed_count = merge_requests.select{|request| request.state == "closed"}.count

    @limit = 10
    @is_remote = true
    @count = type_count(type, @requests_opened_count, @requests_merged_count, @requests_closed_count)
    @pages = Paginator.new @count, @limit, params['page'] || 1
    @offset ||= @pages.offset
    @requests = paginateHelper @requests, 10
    respond_to do |format|
      format.html
      format.js
    end
  end

  # 主要取源项目和目标项目分支及标识（用户名/版本库名）
  # @tip 为空的时候表明发送的pr请求有改动，为1的时候源分支和目标分支没有改动，则不能成功创建
  def new
    # project_menu_type 为了控制base顶部导航
    @project_menu_type = 6
    @tip = params[:show_tip]
    identifier = get_rep_identifier_by_project @project
    @source_project_name = "#{get_user_name(@project.user_id)}/#{identifier}"
    @source_rev = @g.branches(@project.gpid).map{|b| b.name}

    # 获取forked源项目信息
    if @project.forked_from_project_id
      @forked_project = Project.find(@project.forked_from_project_id)
      identifier = get_rep_identifier_by_project @forked_project
      @forked_project_name = "#{get_user_name(@forked_project.user_id)}/#{identifier}"
      @forked_rev = @g.branches(@forked_project.gpid).map{|b| b.name}
    end
  end

  # Creates a merge request.
  # If the operation is successful, 200 and the newly created merge request is returned. If an error occurs, an error number and a message explaining the reason is returned.
  #
  # @example
  #   Gitlab.create_merge_request(5, 'New merge request',
  #     :source_branch => 'source_branch', :target_branch => 'target_branch')
  #   Gitlab.create_merge_request(5, 'New merge request',
  #     :source_branch => 'source_branch', :target_branch => 'target_branch', :assignee_id => 42)
  #
  # @param  [Integer] project The ID of a project.
  # @param  [String] title The title of a merge request.
  # @param  [Hash] options A customizable set of options.
  # @option options [String] :source_branch (required) The source branch name.
  # @option options [String] :target_branch (required) The target branch name.
  # @option options [Integer] :assignee_id (optional) The ID of a user to assign merge request.
  # @return [Gitlab::ObjectifiedHash] Information about created merge request.
  def create
    title = params[:title]
    description = params[:description]
    source_branch = params[:source_branch]
    target_branch = params[:target_branch]
    target_project_id = params[:target_project_id]
    begin
      # 如果分支有改动
      if compare_pull_request(source_branch, target_project_id, target_branch)
        # 如果传送了目标项目ID即向fork源项目发送请求
        # if params[:forked_project_id] && params[:source_project] == "forked_project_name"
        if params[:target_project_id].to_i != @project.id
          target_project_id = params[:forked_project_id].to_i
          request = @g.create_merge_request(@project.gpid, title, User.current.gid, :description => description, :source_branch => source_branch, :target_branch => target_branch, :target_project_id => target_project_id)
          @fork_project_name = Project.find(params[:target_project_id]).try(:name)
          @fork_pr_message = true if @fork_project_name
        else
          request = @g.create_merge_request(@project.gpid, title, User.current.gid, :description => description, :source_branch => source_branch, :target_branch => target_branch)
          respond_to do |format|
            format.js{redirect_to project_pull_request_path(request.id, :project_id => @project.id)}
          end
        end
      else
        tip = 1
        respond_to do |format|
          format.js{redirect_to new_project_pull_request_path(:show_tip => tip)}
        end
      end
    rescue Gitlab::Error::Conflict => e
      @message = e.message
    end
  end

  # Compare branch for MR
  # 判断源分支和目标分支是否有改动
  # status 为true 表示有改动; false:便是没有改动
  def compare_pull_request source_branch, target_project, target_branch
    user_name_source = @project.owner.try(:login)
    identifier = @repository.identifier.downcase
    git_source_tree = '--git-dir=/home/git/repositories/' + user_name_source + '/' + identifier + '.git'
    if target_project
      forked_source_project = Project.find(target_project)
      user_name_target = forked_source_project.owner.try(:login)
      git_target_tree = '--git-dir=/home/git/repositories/' + user_name_target + '/' + identifier + '.git'
      git_sourse_commit_id = @g.get_branch_commit_id(@project.gpid, git_source_tree, source_branch)
      git_target_commit_id = @g.get_branch_commit_id(forked_source_project.gpid, git_target_tree, target_branch)
    else
      git_sourse_commit_id = @g.get_branch_commit_id(@project.gpid, git_source_tree, source_branch)
      git_target_commit_id = @g.get_branch_commit_id(@project.gpid, git_source_tree, target_branch)
    end
    status = (git_sourse_commit_id.try(:commit_id) ==  git_target_commit_id.try(:commit_id) ? false : true)
  end

  # @project_menu_type 为了控制base顶部导航
  # merge_when_succeeds
  def show
    # compare_pull_request source_project, source_branch, target_project, target_branch
    # compare_pull_request
    @project_menu_type = 6
    @type = params[:type]
    @request = @g.merge_request(@project.gpid, params[:id])
    @commits = @g.merge_request_commits(@project.gpid, params[:id].to_i)
    @commits_count = @commits.count
    # @commits_day = @commits.chunk
    @changes = @g.merge_request_changes(@project.gpid, params[:id]).try(:changes)
    @changes_count = @changes.count
    @comments = @g.merge_request_comments(@project.gpid, params[:id]).reverse
    @comments_count = @comments.count

    @limit = 10
    @is_remote = true
    @count = @comments_count
    @pages = Paginator.new @count, @limit, params['page'] || 1
    @offset ||= @pages.offset
    @comments = paginateHelper @comments, 10
  end

  # Accept a merge request.
  # If merge success you get 200 OK.
  # Accept a merge request.
  #
  # @example
  #   Gitlab.accept_pull_rquest(5, 1)
  #
  # @param  [Integer] project The ID of a project.
  # @param  [Integer] id The ID of a merge request.
  # @return [Gitlab::ObjectifiedHash]
  def accept_pull_request
    begin
      status = @g.accept_merge_rquest(@project.gpid, params[:id], User.current.gid)
      PullRequest.create(:pull_request_id => status.id, :user_id => User.current.id, :gpid => status.project_id)
      respond_to do |format|
        format.js{redirect_to project_pull_request_path(status.id, :project_id => @project.id)}
      end
    rescue Exception => e
      @message = e.message
    end
  end

  # Updates a merge request.
  #
  # @example
  #   Gitlab.update_merge_request(5, 42, :title => 'New title')
  #
  # @param  [Integer] project The ID of a project.
  # @param  [Integer] id The ID of a merge request.
  # @param  [Hash] options A customizable set of options.
  # @option options [String] :title The title of a merge request.
  # @option options [String] :source_branch The source branch name.
  # @option options [String] :target_branch The target branch name.
  # @option options [Integer] :assignee_id The ID of a user to assign merge request.
  # @option options [String] :state_event New state (close|reopen|merge).
  # @return [Gitlab::ObjectifiedHash] Information about updated merge request.
  def update_pull_request
    begin
      @g.update_merge_request(@project.gpid, params[:id], User.current.gid, :state_event => params[:state])
      respond_to do |format|
        format.html{redirect_to project_pull_request_path(params[:id], :project_id => @project.id)}
      end
    rescue Exception => e
      @message = e.message
    end
  end

  # Creates a merge request.
  #
  # @example
  #   Gitlab.create_merge_request(5, 'New merge request',
  #     :source_branch => 'source_branch', :target_branch => 'target_branch')
  #   Gitlab.create_merge_request(5, 'New merge request',
  #     :source_branch => 'source_branch', :target_branch => 'target_branch', :assignee_id => 42)
  def create_pull_request_comment
    content = params[:pull_request_comment]
    begin
      @comments = @g.create_merge_request_comment(@project.gpid, params[:id], content, User.current.gid)
      respond_to do |format|
        format.js{redirect_to project_pull_request_path(params[:id], :project_id => @project.id)}
      end
    rescue Exception => e
      @message = e.message
    end
  end

  # Gets the comments on a merge request.
  #
  # @example
  #   Gitlab.merge_request_comments(5, 1)
  def pull_request_comments
    begin
      @comments = @g.merge_request_comments(@project.gpid, params[:id]).reverse
      @comments_count = @comments.count

      @limit = 10
      @is_remote = true
      @count = @comments_count
      @pages = Paginator.new @count, @limit, params['page'] || 1
      @offset ||= @pages.offset
      @comments = paginateHelper @comments, 10
    rescue Exception => e
      @message = e.message
    end
  end

  # Get a list of merge request commits.
  # Parameters:
  # id (required) - The ID of a project
  # merge_request_id (required) - The ID of MR
  def pull_request_commits
    begin
      @type = params[:type]
      @commits = @g.merge_request_commits(@project.gpid, params[:id])
      @commits_count = @commits.count

      @limit = 10
      @is_remote = true
      @count = @commits_count
      @pages = Paginator.new @count, @limit, params['page'] || 1
      @offset ||= @pages.offset
      @commits = paginateHelper @commits, 10
    rescue Exception => e
      @message = e.message
    end
  end

  # Shows information about the merge request including its files and changes. With GitLab 8.2 the return fields upvotes and downvotes are deprecated and always return 0.
  # Parameters:
  # id (required) - The ID of a project
  # merge_request_id (required) - The ID of MR
  def pull_request_changes
    begin
      @type = params[:type]
      @changes = @g.merge_request_changes(@project.gpid, params[:id]).try(:changes)
      @changes_count = @changes.count

      @limit = 10
      @is_remote = true
      @count = @changes_count
      @pages = Paginator.new @count, @limit, params['page'] || 1
      @offset ||= @pages.offset
      @changes = paginateHelper @changes, 10
    rescue Exception => e
      @message = e.message
    end
  end

  private
  def authorize_logged
    if !User.current.logged?
      redirect_to signin_path
      return
    end
  end

  def connect_gitlab
    @g = Gitlab.client
  end

  def find_project_and_repository
    @project = Project.find(params[:project_id])
    render_404 if @project.gpid.blank?
    @repository = Repository.where(:project_id => @project.id, :type => "Repository::Gitlab").first
  rescue ActiveRecord::RecordNotFound
    render_404
  end

end