# Redmine - project management software
# Copyright (C) 2006-2013  Jean-Philippe Lang
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

require 'SVG/Graph/Bar'
require 'SVG/Graph/BarHorizontal'
require 'digest/sha1'
require 'redmine/scm/adapters/abstract_adapter'
require 'tempfile'
require 'json'
require 'open-uri'

class ChangesetNotFound < Exception; end
class InvalidRevisionParam < Exception; end

class RepositoriesController < ApplicationController
  include ApplicationHelper
  menu_item :repository
  menu_item :settings, :only => [:new, :create, :edit, :update, :destroy, :committers]
  default_search_scope :changesets

  before_filter :find_project_by_project_id, :only => [:new, :create, :newrepo, :stats, :quality_analysis]
  before_filter :find_repository, :only => [:edit, :update, :destroy, :committers]

  before_filter :find_project_repository, :except => [:new, :create, :newcreate, :edit, :update, :destroy, :committers, :newrepo, :to_gitlab, :forked, :project_archive, :export_rep_static]
  # 连接gitlab
  # before_filter :connect_gitlab, :only => [:quality_analysis, :commit_diff]

  before_filter :find_changeset, :only => [:revision, :add_related_issue, :remove_related_issue]
  before_filter :authorize , :except => [:newrepo,:newcreate,:fork, :to_gitlab, :forked, :project_archive, :quality_analysis, :commit_diff]
  # 版本库新增权限
  # before_filter :show_rep, :only => [:show, :stats, :revisions, :revision, :diff, :commit_diff ]
  accept_rss_auth :revisions
  # hidden repositories filter // 隐藏代码过滤器
  # before_filter :check_hidden_repo, :only => [:stats, :revisions, :revision, :diff ]
  helper :repositories
  include RepositoriesHelper
  helper :project_score
  require 'ostruct'
  #@root_path = RepositoriesHelper::ROOT_PATH
  # require 'net/ssh'

  rescue_from Redmine::Scm::Adapters::CommandFailed, :with => :show_error_command_failed
  def new
    if @project.repositories.count == 0
      scm = params[:repository_scm] || (Redmine::Scm::Base.all & Setting.enabled_scm).first
      @repository = Repository.factory(scm)
      @repository.is_default = @project.repository.nil?
      @repository.project = @project
      @course_tag = params[:course]
      if @course_tag == 1
        render :layout => 'base_courses'
      else
        render :layout => 'base_projects'
      end
    else
      render_403
    end

  end

  def export_rep_static
    # 管理员界面导出所有项目
    @project = Project.find(params[:id])
    gpid = @project.gpid
    rev = params[:rev]
    cycle = params[:cycle]
    respond_to do |format|
      format.html
      format.xls{
        filename = "#{@project.name.to_s}_#{l(:label_rep_xls)}.xls"
        send_data(export_rep_xls(gpid, :rev => rev, :cycle => cycle), :type => 'application/octet-stream', :filename => filename_for_content_disposition(filename))
      }
    end
  end

  def forked
        @project = Project.find(params[:id])
        @repository = Repository.where("project_id =? and type =?", @project.id, "Repository::Gitlab")
        # 如果当前用户已经fork过该项目，不会新fork项目，则跳至已fork的项
        unless has_forked?(@project, User.current)
          project = project_from_current_project(@project.id, User.current.id)
          redirect_to project_path(project)
        else
          # 自己不能fork自己的项目
          if User.current.id == @project.user_id
            flash[:notice] = l(:project_gitlab_fork_own)
            redirect_to repository_url(@repository)
          else
            g = Gitlab.client
            if User.current.gid.nil?
              begin
                s = Trustie::Gitlab::Sync.new
                s.sync_user(User.current)
              ensure
                logger.error "Synv user failed ==>#{User.current.id}"
              end
            end
            gproject = g.fork(@project.gpid, User.current.gid)
            if gproject
              copy_project(@project, gproject)
              forked_count = @project.forked_count.to_i + 1
              @project.update_attributes(:forked_count => forked_count)
            end
          end
        end
  end

  # 一键ZIP下载
  def project_archive
    g = Gitlab.client
    g.get()
    # g.project_archive(params[:gpid].to_i, params[:rev])
  end

  # 判断用户是否已经fork过该项目
  def has_forked?(project, user)
    projects = Project.where("user_id =?", user)
    projects.map(&:forked_from_project_id).detect{|s| s == @project.id}.nil? ? true : false
  end

  # 获取当前用户fork过的项目
  def project_from_current_project(project, user)
    project = Project.where("user_id =? and forked_from_project_id =?",user, project).first
  end

  # copy a project for fork
  def copy_project(tproject, gproject)
    project = Project.new
    project.name = tproject.name
    project.is_public = tproject.is_public
    project.status = tproject.status
    project.description = tproject.description
    project.hidden_repo = tproject.hidden_repo
    project.user_id = User.current.id
    project.project_type = 0
    project.project_new_type = tproject.project_new_type
    project.gpid = gproject.id
    project.forked_from_project_id = tproject.id
    if project.save
      r = Role.givable.find_by_id(Setting.new_project_user_role_id.to_i) || Role.givable.first
      m = Member.new(:user => User.current, :roles => [r])
      if ProjectScore.where("project_id=?", project.id).first.nil?
        ProjectScore.create(:project_id => project.id, :score => false)
      end
      project_info = ProjectInfo.new(:user_id => User.current.id, :project_id => project.id)
      user_grades =  UserGrade.create(:user_id => User.current.id, :project_id => project.id)
      Rails.logger.debug "UserGrade created: #{user_grades.to_json}"
      project_status = ProjectStatus.create(:project_id => @project.id, :watchers_count => 0, :changesets_count => 0, :project_type => @project.project_type,:grade => 0)
      Rails.logger.debug "ProjectStatus created: #{project_status.to_json}"
      project.members << m
      project.project_infos << project_info
      copy_repository(project, gproject)
      respond_to do |format|
        format.html {
          flash[:notice] = l(:notice_successful_create)
          if params[:continue]
            attrs = {:parent_id => project.parent_id}.reject {|k,v| v.nil?}
            redirect_to new_project_url(attrs, :course => '0')
          else
            redirect_to project_path(project)
          end
        }
        format.api  { render :action => 'show', :status => :created, :location => url_for(:controller => 'projects', :action => 'show', :id => project.id) }
        format.js
      end
    else
      respond_to do |format|
        format.html { render :action => 'forked', :layout => 'base_projects'}
        format.api  { render_validation_errors(@project) }
      end
    end
  end

  def copy_repository(project, gproject)
    # 避免
    # if is_sigle_identifier?(project.user_id, gproject.name)
      repository = Repository.factory('Git')
      repository.project_id = project.id
      repository.type = 'Repository::Gitlab'
      repository.url = gproject.name
      repository.identifier = gproject.name
      repository = repository.save
    # else
    #   flash[:notice] = l(:project_gitlab_create_double_message)
    # end
  end

  def newrepo
    scm = params[:repository_scm] || (Redmine::Scm::Base.all & Setting.enabled_scm).first
    @repository = Repository.factory(scm)
    @repository.is_default = @project.repository.nil?
    @repository.project = @project
    @course_tag = params[:course]
    if @course_tag == 1
      render :layout => 'base_courses'
    else
      render :layout => 'base_projects'
    end
  end

  def fork
    @repository_url = params[:repository_url]

    # @repository.url
    # system "htpasswd -mb "+@root_path+"user.passwd "+params[:repository][:identifier]+" "+@upasswd
    # system "echo -e '"+params[:project_id]+"-"+params[:repository][:identifier]+"-write:"+
    # " "+params[:repository][:identifier]+"'  >> "+@root_path+"group.passwd"
    system "git clone --bare "+@repository_url
    # system "mv "+@project_path+"/hooks/post-update{.sample,}"
    # system "chmod a+x "+@project_path+"/hooks/post-update"
    # system "."+@project_path+"/hooks/post-update"
    # system "echo -e 'Allow from all \n Order Deny,Allow \n "+
    # "<Limit PUT POST DELETE PROPPATCH MKCOL COPY MOVE LOCK UNLOCK> \n"+
    # "Require group "+params[:project_id]+"-"+params[:repository][:identifier]+"-write  \n "+
    # "</Limit> \n ' >>"+
    # @project_path+"/.htaccess"
    flash[:notice] = l(:label_notice_fork_successed)
    @repositories = @project.repositories
    render :action => 'show', :layout => 'base_projects'
  end


  HOOK_TEMPLATE = %Q{#!/bin/sh
exec sh -c '
function update()
{
        CMD_PATH=`dirname $0`;
        cd $CMD_PATH;
        PY_PATH=$PWD/../../git_refresh_changes.py;
        [[ -s "$PY_PATH"   ]] && $(which python) $PY_PATH $PWD;
        cd -;
}
git update-server-info
update
'
  }

  def create
    # 判断版本库创建者是否有同名版本库，避免版本库路径一致问题
    unless is_sigle_identifier?(@project.user_id, params[:repository].first[1])
      flash[:notice] = l(:project_gitlab_create_double_message)
      redirect_to settings_project_url(@project, :tab => 'repositories')
    else
      attrs = pickup_extra_info
      @repository = Repository.factory('Git')
      @repository.safe_attributes = params[:repository]
      if attrs[:attrs_extra].keys.any?
        @repository.merge_extra_info(attrs[:attrs_extra])
      end
      @repository.project = @project
      @repository.type = 'Repository::Gitlab'
      @repository.identifier = @repository.identifier.downcase
      @repository.url = @repository.identifier
      if request.post? && @repository.save
        s = Trustie::Gitlab::Sync.new
        s.create_project(@project, @repository)
        redirect_to(:controller => 'repositories', :action => 'show', :id => @project, :repository_id => gitlab_repository(@project).try(:identifier))
      else
        redirect_to settings_project_url(@project, :tab => 'repositories',:repository_error_message=>@repository.errors.full_messages)
      end
    end
  end

  def edit
  end

  def update
    attrs = pickup_extra_info
    @repository.safe_attributes = attrs[:attrs]
    if attrs[:attrs_extra].keys.any?
      @repository.merge_extra_info(attrs[:attrs_extra])
    end
    @repository.project = @project
    if request.put? && @repository.save
      redirect_to settings_project_url(@project, :tab => 'repositories')
    else
      render :action => 'edit'
    end
  end

  def pickup_extra_info
    p       = {}
    p_extra = {}
    params[:repository].each do |k, v|
      if k =~ /^extra_/
        p_extra[k] = v
      else
        p[k] = v
      end
    end
    {:attrs => p, :attrs_extra => p_extra}
  end
  private :pickup_extra_info

  def committers
    @committers = @repository.committers
    @users = @project.users
    additional_user_ids = @committers.collect(&:last).collect(&:to_i) - @users.collect(&:id)
    @users += User.find_all_by_id(additional_user_ids) unless additional_user_ids.empty?
    @users.compact!
    @users.sort!
    if request.post? && params[:committers].is_a?(Hash)
      # Build a hash with repository usernames as keys and corresponding user ids as values
      @repository.committer_ids = params[:committers].values.inject({}) {|h, c| h[c.first] = c.last; h}
      flash[:notice] = l(:notice_successful_update)
      respond_to do |format|
        format.html{
          render :layout => "base_projects"
        }
      end
    elsif request.get?
      respond_to do |format|
        format.html{
          render :layout => "base_projects"
        }
      end
    end
  end

  def quality_analysis
    gitlab_branches = @g.branches(@project.gpid)
    @branch_names = gitlab_branches.map{|b| b.name}
    @gitlab_default_branch = @g_project.default_branch
    # language = params[:language]
    # branch = params[:branch]
    # path = params[:path]
    # user_name = User.find(@project.user_id).try(:login)
    # rep_name = params[:repository_id]
    # host = "192.168.0.200"
    # port = "1125"
    # username = "git"
    # password = "123123"
    # server_cmd1 = "sh gitclone.sh" + " " + user_name + " " + rep_name
    # # 连接到远程主机 foobar
    # ssh = Net::SSH.start(host, username, :port => port, :password => password) do |ssh|
    #   result = ssh.exec!(server_cmd1)
    #   path = "/home/git/repo/" + user_name + "/" + rep_name
    #   # sonar 分析
    #   # server_cmd2
    #   # 删除clone的版本库
    #   # server_cmd3
    # end
    respond_to do |format|
      format.js
      format.html{
        render :layout => "base_projects"
      }
    end
  end

  def destroy
    DestroyRepositoryTask.new.destroy(User.current.id, @repository.id)
    @repository.hidden = true
    @repository.save
    redirect_to settings_project_url(@project, :tab => 'repositories')
  end

  def to_gitlab
    @project = Project.find(params[:project_id])
    @repository = Repository.find(params[:id])
    s = Trustie::Gitlab::Sync.new
    s.sync_project(@project, path: params[:repo_name], import_url: @repository.url)
    @repository.type = 'Repository::Gitlab'
    @repository.save
    redirect_to :controller => 'repositories', :action => 'show', :id => @project.id, to: 'gitlab'
  end

  def show
    # 顶部导航
    @project_menu_type = 5

    # TODO: the below will move to filter, done.
    # 获取版本库目录结构
    @entries = @repository.entries(@path, @rev)
    if request.xhr?
      @entries ? render(:partial => 'dir_list_content') : render(:nothing => true)
    else
      unless @entries.blank?
        @changesets_latest_coimmit = @g.commit(@project.gpid, @entries.first.try(:lastrev))
        # 总的提交数
        @changesets_all_count = @g.user_static(@project.gpid, :rev => @rev).count
        # 获取默认分支
        @g_default_branch = @g_project.default_branch.nil? ?  "master" : @g_project.default_branch

        @creator = @project.owner.to_s
        gitlab_address = Redmine::Configuration['gitlab_address']
        # REDO:需优化，仅测试用
        @zip_path = Gitlab.endpoint.to_s + "/projects/" + @project.gpid.to_s + "/repository/archive?&private_token=" + Gitlab.private_token
      end

      @creator = @project.owner.to_s
      gitlab_address = Redmine::Configuration['gitlab_address']
      @repos_url = gitlab_address.to_s+"/" + @creator + "/" + @repository.identifier+"."+"git"

      # 一些数据的异步同步更新
      # 访问版本庫后更新project_score表数据；changeset_num为提交总数
      project_score = @project.project_score
      if project_score.nil?
        ProjectScore.create(:project_id => @project.id, :score => false)
      else
        project_score.update_column(:changeset_num, @changesets_all_count)
      end
      # 更新提交时间，用于课程
      unless @changesets_latest_coimmit.blank?
        update_commits_date(@project, @changesets_latest_coimmit)
      end

      render :layout => 'base_projects'
    end
  end

  alias_method :browse, :show

  # 获取版本文件目录的
  def tree_head_message

  end

  # 注：由于考虑到性能所以commits api每次返回20条记录
  def changes
    # 顶部导航
    @project_menu_type = 5
    @entry = @repository.entry(@path, @rev)
    (show_error_not_found; return) unless @entry
    g = Gitlab.client
    limit = 10
    # 每次页面的换回值从1开始,但是gitlab的页面查询是从0开始,所以先改变page的类型减一在改回来
    @commits = g.commits(@project.gpid, page:(params[:page].to_i - 1).to_s, ref_name:@rev)
    @commits_count =  params[:commit_count].nil? ? @g.user_static(@project.gpid, :rev => @rev).count : params[:commit_count].to_i
    @commits_pages = Paginator.new @commits_count, limit, params[:page]
    # @offset ||= @commits_pages.offset
    # @commits = paginateHelper @commits, limit

    render :layout => 'base_projects'
  end


  def revisions
    @changeset_count = @repository.changesets.count
    @changeset_pages = Paginator.new @changeset_count,
                                     per_page_option,
                                     params['page']
    @changesets = @repository.changesets.
        limit(@changeset_pages.per_page).
        offset(@changeset_pages.offset).
        includes(:user, :repository, :parents).
        all

    respond_to do |format|
      format.html { render :layout => 'base_projects' }
      format.atom { render_feed(@changesets, :title => "#{@project.name}: #{l(:label_revision_plural)}") }
    end
  end

  def raw
    entry_and_raw(true)
  end

  def entry
    # 顶部导航
    @project_menu_type = 5

    entry_and_raw(false)
    @content = @repository.cat(@path, @rev)
    @changesets_latest_coimmit = @g.commit(@project.gpid, @entry.try(:lastrev))
    # 总的提交数
    @changesets_all_count = @g.user_static(@project.gpid, :rev => @rev).count
    if is_entry_text_data?(@content, @path)
      render :layout => 'base_projects'
    end
  end

  def entry_and_raw(is_raw)
    @entry = @repository.entry(@path, @rev)
    (show_error_not_found; return) unless @entry

    # If the entry is a dir, show the browser
    (show; return) if @entry.is_dir?

    @content = @repository.cat(@path, @rev)
    (show_error_not_found; return) unless @content
    if is_raw || (@content.size && @content.size > Setting.file_max_size_displayed.to_i.kilobyte) || !is_entry_text_data?(@content, @path)
      # Force the download
      send_opt = { :filename => filename_for_content_disposition(@path.split('/').last) }
      send_type = Redmine::MimeType.of(@path)
      send_opt[:type] = send_type.to_s if send_type
      send_opt[:disposition] = (Redmine::MimeType.is_type?('image', @path) && !is_raw ? 'inline' : 'attachment')
      send_data @content, send_opt
    else
      # Prevent empty lines when displaying a file with Windows style eol
      # TODO: UTF-16
      # Is this needs? AttachmentsController reads file simply.
      @content.gsub!("\r\n", "\n")
      @changeset = @repository.find_changeset_by_name(@rev)
    end
  end
  private :entry_and_raw

  def is_entry_text_data?(ent, path)
    # UTF-16 contains "\x00".
    # It is very strict that file contains less than 30% of ascii symbols
    # in non Western Europe.
    return true if Redmine::MimeType.is_type?('text', path)
    # Ruby 1.8.6 has a bug of integer divisions.
    # http://apidock.com/ruby/v1_8_6_287/String/is_binary_data%3F
    return false if ent.is_binary_data?
    true
  end
  private :is_entry_text_data?

  def annotate
    @entry = @repository.entry(@path, @rev)
    (show_error_not_found; return) unless @entry

    @annotate = @repository.scm.annotate(@path, @rev)
    if @annotate.nil? || @annotate.empty?
      (render_error l(:error_scm_annotate); return)
    end
    ann_buf_size = 0
    @annotate.lines.each do |buf|
      ann_buf_size += buf.size
    end
    if ann_buf_size > Setting.file_max_size_displayed.to_i.kilobyte
      (render_error l(:error_scm_annotate_big_text_file); return)
    end
    @changeset = @repository.find_changeset_by_name(@rev)
  end

  def revision
    respond_to do |format|
      format.html{render :layout => 'base_projects'}
      format.js {render :layout => false}
    end
  end

  # Adds a related issue to a changeset
  # POST /projects/:project_id/repository/(:repository_id/)revisions/:rev/issues
  def add_related_issue
    @issue = @changeset.find_referenced_issue_by_id(params[:issue_id])
    if @issue && (!@issue.visible? || @changeset.issues.include?(@issue))
      @issue = nil
    end

    if @issue
      @changeset.issues << @issue
    end
  end

  # Removes a related issue from a changeset
  # DELETE /projects/:project_id/repository/(:repository_id/)revisions/:rev/issues/:issue_id
  def remove_related_issue
    @issue = Issue.visible.find_by_id(params[:issue_id])
    if @issue
      @changeset.issues.delete(@issue)
    end
  end

  # 每次提交对应的文件差异
  def commit_diff
    # 顶部导航
    @project_menu_type = 5
    @commit_diff = @g.commit_diff(@project.gpid, params[:changeset])
    diff = ActiveSupport::JSON.decode(@commit_diff.to_json).first
    diff = OpenStruct.new(diff)
    @diff_file = Trustie::Gitlab::Diff::File.new(diff)


    @commit_details = @g.commit(@project.gpid, params[:changeset])
    render :layout => 'base_projects'
  end

  def diff
    if params[:format] == 'diff'
      @diff = @repository.diff(@path, @rev, @rev_to)
      (show_error_not_found; return) unless @diff
      filename = "changeset_r#{@rev}"
      filename << "_r#{@rev_to}" if @rev_to
      send_data @diff.join, :filename => "#{filename}.diff",
                :type => 'text/x-patch',
                :disposition => 'attachment'
    else
      @diff_type = params[:type] || User.current.pref[:diff_type] || 'inline'
      @diff_type = 'inline' unless %w(inline sbs).include?(@diff_type)

      # Save diff type as user preference
      if User.current.logged? && @diff_type != User.current.pref[:diff_type]
        User.current.pref[:diff_type] = @diff_type
        User.current.preference.save
      end
      @cache_key = "repositories/diff/#{@repository.id}/" +
          Digest::MD5.hexdigest("#{@path}-#{@rev}-#{@rev_to}-#{@diff_type}-#{current_language}")
      unless read_fragment(@cache_key)
        @diff = @repository.diff(@path, @rev, @rev_to)
        unless @diff
          show_error_not_found
          return
        end
      end

      @changeset = @repository.find_changeset_by_name(@rev)
      @changeset_to = @rev_to ? @repository.find_changeset_by_name(@rev_to) : nil
      @diff_format_revisions = @repository.diff_format_revisions(@changeset, @changeset_to)
    end
    render :layout => 'base_projects'
  end

  def stats
    if @project.gpid.nil?
      render 404
      return
    end
    project_id = @project.gpid
    # @repository_id = @repository.identifier
    # creator = params[:creator]
    rev = params[:rev]
    g = Gitlab.client
    begin
    @static_total_per_user = g.rep_stats(project_id, :rev => rev)
    # 更新rep_statics统计数
    @static_total_per_user.each do |static|
      rep_static = RepStatics.where("project_id =? and email =?", @project.id, static.email.to_s).first
      if rep_static.nil?
        RepStatics.create(:project_id => @project.id, :uname => static.uname, :commits_num => static.commits_num, :email => static.email, :add => static.add, :del => static.del, :changeset => static.changes)
      else
        if @rev == params[:default_branch]
          rep_static.update_attributes(:uname => static.uname, :commits_num => static.commits_num, :email => static.email, :add => static.add, :del => static.del, :changeset => static.changes)
        end
      end
    end
    rescue
      render_404
      return
    end
    render :layout => 'base_projects'
  end

  def graph
    data = nil
    case params[:graph]
      when "commits_per_month"
        data = graph_commits_per_month(@repository)
      when "commits_per_author"
        data = graph_commits_per_author(@repository)
      when "author_commits_per_month"
        data = graph_author_commits_per_month(@repository)
      when "author_commits_six_month"
        data = author_commits_six_month(@repository)
      when "author_code_six_months"
        data = author_code_six_month(@repository)
    end
    if data
      headers["Content-Type"] = "image/svg+xml"
      send_data(data, :type => "image/svg+xml", :disposition => "inline")
    else
      render_404
    end
  end

  private
  # 更新项目统计数
  def update_commits_count project, count
    project.project_score.update_attribute(:changeset_num, count)
  end

  # 更新项目提交次数时间
  def update_commits_date project, date
    project.project_score.update_attribute(:commit_time, date.created_at)
  end

  # 链接gitlab
  def connect_gitlab
    begin
      @g = Gitlab.client
      unless @project.gpid.nil?
        @g_project = @g.project(@project.gpid)
      end
    rescue => e
      logger.error("connect gitlab failed ==> #{e}")
    end
  end

  def show_rep
    visible_repository?(@project)
  end

  def find_repository
    @repository = Repository.find(params[:id])
    @project = @repository.project
    rescue ActiveRecord::RecordNotFound
      render_404
  end

  REV_PARAM_RE = %r{\A[a-f0-9]*\Z}i
  REP_TYPE = "Repository::Gitlab"

  # 获取项目、版本库、路劲、默认分支
  def find_project_repository
    @project = Project.find(params[:id])
    @repository = Repository.where(:type => REP_TYPE, :project_id => @project).first
    (render_404; return false) unless (@repository || @project.gpid)
    @path = params[:path].is_a?(Array) ? params[:path].join('/') : params[:path].to_s
    @g = Gitlab.client
    @g_project = @g.project(@project.gpid)
    @g_default_branch = @g_project.default_branch
    # gitlab端获取默认分支
    @rev = params[:rev].blank? ? @g_default_branch : params[:rev].to_s.strip
    @rev_to = params[:rev_to]
    unless @rev.to_s.match(REV_PARAM_RE) && @rev_to.to_s.match(REV_PARAM_RE)
      if @repository.branches.blank?
        raise InvalidRevisionParam
      end
    end
  rescue ActiveRecord::RecordNotFound
    render_404
  rescue InvalidRevisionParam
    show_error_not_found
  end

  def find_changeset
    if @rev.present?
      @changeset = @repository.find_changeset_by_name(@rev)
    end
    show_error_not_found unless @changeset
  end

  def show_error_not_found
    render_error :message => l(:error_scm_not_found), :status => 404
  end

  def show_error_forbidden
    render_error :status => 403
  end

  # Handler for Redmine::Scm::Adapters::CommandFailed exception
  def show_error_command_failed(exception)
    render_error l(:error_scm_command_failed, exception.message)
  end

  def graph_commits_per_month(repository)
    @date_to = Date.today
    @date_from = @date_to << 11
    @date_from = Date.civil(@date_from.year, @date_from.month, 1)
    commits_by_day = Changeset.count(
        :all, :group => :commit_date,
        :conditions => ["repository_id = ? AND commit_date BETWEEN ? AND ?", repository.id, @date_from, @date_to])
    commits_by_month = [0] * 12
    commits_by_day.each {|c| commits_by_month[(@date_to.month - c.first.to_date.month) % 12] += c.last }

    changes_by_day = Change.count(
        :all, :group => :commit_date, :include => :changeset,
        :conditions => ["#{Changeset.table_name}.repository_id = ? AND #{Changeset.table_name}.commit_date BETWEEN ? AND ?", repository.id, @date_from, @date_to])
    changes_by_month = [0] * 12
    changes_by_day.each {|c| changes_by_month[(@date_to.month - c.first.to_date.month) % 12] += c.last }

    fields = []
    12.times {|m| fields << month_name(((Date.today.month - 1 - m) % 12) + 1)}

    graph = SVG::Graph::Bar.new(
        :height => 300,
        :width => 600,
        :fields => fields.reverse,
        :stack => :side,
        :scale_integers => true,
        :step_x_labels => 2,
        :show_data_values => true,
        :graph_title => l(:label_commits_per_month),
        :show_graph_title => true
    )

    # 具状图
    graph.add_data(
        :data => commits_by_month[0..11].reverse,
        :title => l(:label_revision_plural)
    )

    graph.add_data(
        :data => changes_by_month[0..11].reverse,
        :title => l(:label_change_plural)
    )

    graph.burn
  end

  def graph_commits_per_author(repository)
    commits_by_author = Changeset.count(:all, :group => :committer, :conditions => ["repository_id = ?", repository.id])
    commits_by_author = commits_by_author.to_a.sort! {|x, y| x.last <=> y.last}.last(25)

    changes_by_author = Change.count(:all, :group => :committer, :include => :changeset, :conditions => ["#{Changeset.table_name}.repository_id = ?", repository.id])
    h = changes_by_author.inject({}) {|o, i| o[i.first] = i.last; o}

    fields = commits_by_author.collect {|r| r.first}
    commits_data = commits_by_author.collect {|r| r.last}
    changes_data = commits_by_author.collect {|r| h[r.first] || 0}

    fields = fields + [""]*(10 - fields.length) if fields.length<10
    commits_data = commits_data + [0]*(10 - commits_data.length) if commits_data.length<10
    changes_data = changes_data + [0]*(10 - changes_data.length) if changes_data.length<10

    # Remove email adress in usernames
    fields = fields.collect {|c| c.gsub(%r{<.+@.+>}, '') }

    graph = SVG::Graph::BarHorizontal.new(
        :height => 400,
        :width => 600,
        :fields => fields,
        :stack => :side,
        :scale_integers => true,
        :show_data_values => true,
        :rotate_y_labels => false,
        :graph_title => l(:label_commits_per_author),
        :show_graph_title => true
    )
    graph.add_data(
        :data => commits_data,
        :title => l(:label_revision_plural)
    )
    graph.add_data(
        :data => changes_data,
        :title => l(:label_change_plural)
    )
    graph.burn
  end

  # 用户最近一年的提交次数
  def graph_author_commits_per_month(repository)
    @date_to = Date.today
    @date_from = @date_to << 12
    @date_from = Date.civil(@date_from.year, @date_from.month,  @date_from.day)
    commits_by_author = Changeset.count(:all, :group => :committer,
                                        :conditions => ["#{Changeset.table_name}.repository_id = ? AND #{Changeset.table_name}.commit_date BETWEEN ? AND ?", repository.id, @date_from, @date_to])
    commits_by_author = commits_by_author.to_a.sort! {|x, y| x.last <=> y.last}.last(25)

    fields = commits_by_author.collect {|r| r.first}
    commits_data = commits_by_author.collect {|r| r.last}

    fields = fields + [""]*(10 - fields.length) if fields.length<10
    commits_data = commits_data + [0]*(10 - commits_data.length) if commits_data.length<10

    # Remove email adress in usernames
    fields = fields.collect {|c| c.gsub(%r{<.+@.+>}, '') }

    graph = SVG::Graph::BarHorizontal.new(
        :height => 400,
        :width => 600,
        :fields => fields,
        :stack => :side,
        :scale_integers => true,
        :show_data_values => true,
        :rotate_y_labels => false,
        :graph_title => l(:label_author_commits_year),
        :show_graph_title => true,
        :no_css => true
    )
    graph.add_data(
        :data => commits_data,
        :title => l(:label_revision_commit_count)
    )
    graph.burn
  end

  # 用户最近六个月的提交次数
  def author_commits_six_month(repository)
    @date_to = Date.today
    @date_from = @date_to << 6
    @date_from = Date.civil(@date_from.year, @date_from.month, @date_from.day)
    commits_by_author = Changeset.count(:all, :group => :committer,
                                        :conditions => ["#{Changeset.table_name}.repository_id = ? AND #{Changeset.table_name}.commit_date BETWEEN ? AND ?", repository.id, @date_from, @date_to])
    commits_by_author = commits_by_author.to_a.sort! {|x, y| x.last <=> y.last}.last(25)

    fields = commits_by_author.collect {|r| r.first}
    commits_data = commits_by_author.collect {|r| r.last}

    fields = fields + [""]*(10 - fields.length) if fields.length<10
    commits_data = commits_data + [0]*(10 - commits_data.length) if commits_data.length<10

    # Remove email adress in usernames
    fields = fields.collect {|c| c.gsub(%r{<.+@.+>}, '') }

    graph = SVG::Graph::BarHorizontal.new(
        :height => 400,
        :width => 600,
        :fields => fields,
        :stack => :side,
        :scale_integers => true,
        :show_data_values => true,
        :rotate_y_labels => false,
        :graph_title => l(:label_author_commits_six_month),
        :show_graph_title => true
    )
    graph.add_data(
        :data => commits_data,
        :title => l(:label_revision_commit_count)
    )
    graph.burn
  end

  # 最近六个月代码量统计
  def author_code_six_month(repository)
    @date_to = Date.today
    @date_from = @date_to << 6
    @date_from = Date.civil(@date_from.year, @date_from.month, @date_from.day)
    commits_by_author = Changeset.count(:group => :committer, :conditions => ["#{Changeset.table_name}.repository_id = ? AND #{Changeset.table_name}.commit_date BETWEEN ? AND ?", repository.id, @date_from, @date_to])
    commits_by_author = commits_by_author.to_a.sort! {|x, y| x.last <=> y.last}.last(40)
    all_author = []
    commits_by_author.each do |cba|
      all_author << cba.first
    end
    # all_author = all_author.collect {|c| c.gsub(%r{/ /<.+@.+>}, '') }
    all_author = all_author.collect {|c| c.split.first }
    commits_by_author = repository.commits(all_author, "#{@date_from}", "#{@date_to}", repository.id == 150 ? "szzh" : 'master')

    fields = commits_by_author.collect {|r| r.first}
    commits_data = commits_by_author.collect {|r| r.last}

    fields = fields + [""]*(10 - fields.length) if fields.length<10
    commits_data = commits_data + [0]*(10 - commits_data.length) if commits_data.length<10

    # Remove email adress in usernames
    fields = fields.collect {|c| c.gsub(%r{<.+@.+>}, '') }

    graph = SVG::Graph::BarHorizontal.new(
        :height => 400,
        :width => 600,
        :fields => fields,
        :stack => :side,
        :scale_integers => true,
        :show_data_values => true,
        :rotate_y_labels => false,
        :graph_title => l(:label_author_code_six_month),
        :show_graph_title => true
    )
    graph.add_data(
        :data => commits_data,
        :title => l(:lable_revision_code_count)
    )
    graph.burn
  end

end