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# Redmine - project management software

# Copyright (C) 2006-2012  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 'redmine/scm/adapters/subversion_adapter'

class Repository::Subversion < Repository

  attr_protected :root_url

  validates_presence_of :url

  validates_format_of :url, :with => /^(http|https|svn(\+[^\s:\/\\]+)?|file):\/\/.+/i

  def self.scm_adapter_class

    Redmine::Scm::Adapters::SubversionAdapter

  end

  def self.scm_name

    'Subversion'

  end

  def supports_directory_revisions?

    true

  end

  def repo_log_encoding

    'UTF-8'

  end

  def latest_changesets(path, rev, limit=10)

    revisions = scm.revisions(path, rev, nil, :limit => limit)

    if revisions

      identifiers = revisions.collect(&:identifier).compact

      changesets.where(:revision => identifiers).reorder("committed_on DESC").includes(:repository, :user).all

    else

      []

    end

  end

  # Returns a path relative to the url of the repository

  def relative_path(path)

    path.gsub(Regexp.new("^\/?#{Regexp.escape(relative_url)}"), '')

  end

  def fetch_changesets

    scm_info = scm.info

    if scm_info

      # latest revision found in database

      db_revision = latest_changeset ? latest_changeset.revision.to_i : 0

      # latest revision in the repository

      scm_revision = scm_info.lastrev.identifier.to_i

      if db_revision < scm_revision

        logger.debug "Fetching changesets for repository #{url}" if logger && logger.debug?

        identifier_from = db_revision + 1

        while (identifier_from <= scm_revision)

          # loads changesets by batches of 200

          identifier_to = [identifier_from + 199, scm_revision].min

          revisions = scm.revisions('', identifier_to, identifier_from, :with_paths => true)

          revisions.reverse_each do |revision|

            transaction do

              changeset = Changeset.create(:repository   => self,

                                           :revision     => revision.identifier,

                                           :committer    => revision.author,

                                           :committed_on => revision.time,

                                           :comments     => revision.message)

              revision.paths.each do |change|

                changeset.create_change(change)

              end unless changeset.new_record?

            end

          end unless revisions.nil?

          identifier_from = identifier_to + 1

        end

      end

    end

  end

  protected

  def load_entries_changesets(entries)

    return unless entries

    entries_with_identifier = entries.select {|entry| entry.lastrev && entry.lastrev.identifier.present?}

    identifiers = entries_with_identifier.map {|entry| entry.lastrev.identifier}.compact.uniq

    if identifiers.any?

      changesets_by_identifier = changesets.where(:revision => identifiers).includes(:user, :repository).all.group_by(&:revision)

      entries_with_identifier.each do |entry|

        if m = changesets_by_identifier[entry.lastrev.identifier]

          entry.changeset = m.first

        end

      end

    end

  end

  private

  # Returns the relative url of the repository

  # Eg: root_url = file:///var/svn/foo

  #     url      = file:///var/svn/foo/bar

  #     => returns /bar

  def relative_url

    @relative_url ||= url.gsub(Regexp.new("^#{Regexp.escape(root_url || scm.root_url)}", Regexp::IGNORECASE), '')

  end

end