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# Redmine - project management software

# Copyright (C) 2006-2011  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'

class ChangesetNotFound < Exception; end

class InvalidRevisionParam < Exception; end

class RepositoriesController < ApplicationController

  menu_item :repository

  menu_item :settings, :only => :edit

  default_search_scope :changesets

  before_filter :find_repository, :except => :edit

  before_filter :find_project, :only => :edit

  before_filter :authorize

  accept_rss_auth :revisions

  rescue_from Redmine::Scm::Adapters::CommandFailed, :with => :show_error_command_failed

  def edit

    @repository = @project.repository

    if !@repository

      params[:repository_scm]='Mercurial'

      @repository = Repository.factory(params[:repository_scm])

      @repository.project = @project if @repository

    end

    if request.post? && @repository

      p1 = params[:repository]

      p       = {}

      p_extra = {}

      p1.each do |k, v|

        if k =~ /^extra_/

          p_extra[k] = v

        else

          p[k] = v

        end

      end

      @repository.attributes = p

      @repository.merge_extra_info(p_extra)

      @repository.save

    end

    render(:update) do |page|

      page.replace_html "tab-content-repository",

                        :partial => 'projects/settings/repository'

      if @repository && !@project.repository

        @project.reload # needed to reload association

        page.replace_html "main-menu", render_main_menu(@project)

      end

    end

  end

  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)

      redirect_to :action => 'committers', :id => @project

    end

  end

  def destroy

    @repository.destroy

    redirect_to :controller => 'projects',

                :action     => 'settings',

                :id         => @project,

                :tab        => 'repository'

  end

  def show

    @repository.fetch_changesets if Setting.autofetch_changesets? && @path.empty?

    @entries = @repository.entries(@path, @rev)

    @changeset = @repository.find_changeset_by_name(@rev)

    if request.xhr?

      @entries ? render(:partial => 'dir_list_content') : render(:nothing => true)

    else

      (show_error_not_found; return) unless @entries

      @changesets = @repository.latest_changesets(@path, @rev)

      @properties = @repository.properties(@path, @rev)

      render :action => 'show'

    end

  end

  alias_method :browse, :show

  def changes

    @entry = @repository.entry(@path, @rev)

    (show_error_not_found; return) unless @entry

    @changesets = @repository.latest_changesets(@path, @rev, Setting.repository_log_display_limit.to_i)

    @properties = @repository.properties(@path, @rev)

    @changeset = @repository.find_changeset_by_name(@rev)

  end

  def revisions

    @changeset_count = @repository.changesets.count

    @changeset_pages = Paginator.new self, @changeset_count,

                                     per_page_option,

                                     params['page']

    @changesets = @repository.changesets.find(:all,

                       :limit  =>  @changeset_pages.items_per_page,

                       :offset =>  @changeset_pages.current.offset,

                       :include => [:user, :repository, :parents])

    respond_to do |format|

      format.html { render :layout => false if request.xhr? }

      format.atom { render_feed(@changesets, :title => "#{@project.name}: #{l(:label_revision_plural)}") }

    end

  end

  def entry

    @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 'raw' == params[:format]

      # 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_data @content, send_opt

    else

      @display_raw = ((@content.size && @content.size > Setting.file_max_size_displayed.to_i.kilobyte) || !is_entry_text_data?(@content, @path))

      # 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

  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

    raise ChangesetNotFound if @rev.blank?

    @changeset = @repository.find_changeset_by_name(@rev)

    raise ChangesetNotFound unless @changeset

    respond_to do |format|

      format.html

      format.js {render :layout => false}

    end

  rescue ChangesetNotFound

    show_error_not_found

  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)

        show_error_not_found unless @diff

      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

  end

  def stats

  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)

    end

    if data

      headers["Content-Type"] = "image/svg+xml"

      send_data(data, :type => "image/svg+xml", :disposition => "inline")

    else

      render_404

    end

  end

  private

  REV_PARAM_RE = %r{\A[a-f0-9]*\Z}i

  def find_repository

    @project = Project.find(params[:id])

    @repository = @project.repository

    (render_404; return false) unless @repository

    @path = params[:path].join('/') unless params[:path].nil?

    @path ||= ''

    @rev = params[:rev].blank? ? @repository.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 show_error_not_found

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

  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 = repository.changesets.count(

                          :all, :group => :commit_date,

                          :conditions => ["commit_date BETWEEN ? AND ?", @date_from, @date_to])

    commits_by_month = [0] * 12

    commits_by_day.each {|c| commits_by_month[c.first.to_date.months_ago] += c.last }

    changes_by_day = repository.changes.count(

                          :all, :group => :commit_date,

                          :conditions => ["commit_date BETWEEN ? AND ?", @date_from, @date_to])

    changes_by_month = [0] * 12

    changes_by_day.each {|c| changes_by_month[c.first.to_date.months_ago] += c.last }

    fields = []

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

    graph = SVG::Graph::Bar.new(

      :height => 300,

      :width => 800,

      :fields => fields.reverse,

      :stack => :side,

      :scale_integers => true,

      :step_x_labels => 2,

      :show_data_values => false,

      :graph_title => l(:label_commits_per_month),

      :show_graph_title => true

    )

    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 = repository.changesets.count(:all, :group => :committer)

    commits_by_author.to_a.sort! {|x, y| x.last <=> y.last}

    changes_by_author = repository.changes.count(:all, :group => :committer)

    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 => 800,

      :fields => fields,

      :stack => :side,

      :scale_integers => true,

      :show_data_values => false,

      :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

end

class Date

  def months_ago(date = Date.today)

    (date.year - self.year)*12 + (date.month - self.month)

  end

  def weeks_ago(date = Date.today)

    (date.year - self.year)*52 + (date.cweek - self.cweek)

  end

end

class String

  def with_leading_slash

    starts_with?('/') ? self : "/#{self}"

  end

end