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# redMine - project management software

# Copyright (C) 2006-2007  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.

class Repository < ActiveRecord::Base

  belongs_to :project

  has_many :changesets, :order => "#{Changeset.table_name}.id DESC"

  has_many :changes, :through => :changesets

  # Raw SQL to delete changesets and changes in the database

  # has_many :changesets, :dependent => :destroy is too slow for big repositories

  before_destroy :clear_changesets

  # Checks if the SCM is enabled when creating a repository

  validate_on_create { |r| r.errors.add(:type, :invalid) unless Setting.enabled_scm.include?(r.class.name.demodulize) }

  # Removes leading and trailing whitespace

  def url=(arg)

    write_attribute(:url, arg ? arg.to_s.strip : nil)

  end

  # Removes leading and trailing whitespace

  def root_url=(arg)

    write_attribute(:root_url, arg ? arg.to_s.strip : nil)

  end

  def scm

    @scm ||= self.scm_adapter.new url, root_url, login, password

    update_attribute(:root_url, @scm.root_url) if root_url.blank?

    @scm

  end

  def scm_name

    self.class.scm_name

  end

  def supports_cat?

    scm.supports_cat?

  end

  def supports_annotate?

    scm.supports_annotate?

  end

  def entry(path=nil, identifier=nil)

    scm.entry(path, identifier)

  end

  def entries(path=nil, identifier=nil)

    scm.entries(path, identifier)

  end

  def branches

    scm.branches

  end

  def tags

    scm.tags

  end

  def default_branch

    scm.default_branch

  end

  def properties(path, identifier=nil)

    scm.properties(path, identifier)

  end

  def cat(path, identifier=nil)

    scm.cat(path, identifier)

  end

  def diff(path, rev, rev_to)

    scm.diff(path, rev, rev_to)

  end

  # Returns a path relative to the url of the repository

  def relative_path(path)

    path

  end

  # Finds and returns a revision with a number or the beginning of a hash

  def find_changeset_by_name(name)

    # TODO: is this query efficient enough? can we write as single query?

    e = changesets.find(:first, :conditions => ['revision = ? OR scmid = ?', name.to_s, name.to_s])

    return e if e

    changesets.find(:first, :conditions => ['scmid LIKE ?', "#{name}%"])

  end

  def latest_changeset

    @latest_changeset ||= changesets.find(:first)

  end

  # Returns the latest changesets for +path+

  # Default behaviour is to search in cached changesets

  def latest_changesets(path, rev, limit=10)

    if path.blank?

      changesets.find(:all, :include => :user,

                            :limit => limit)

    else

      changes.find(:all, :include => {:changeset => :user},

                         :conditions => ["path = ?", path.with_leading_slash],

                         :order => "#{Changeset.table_name}.id DESC",

                         :limit => limit).collect(&:changeset)

    end

  end

  def scan_changesets_for_issue_ids

    self.changesets.each(&:scan_comment_for_issue_ids)

  end

  # Returns an array of committers usernames and associated user_id

  def committers

    @committers ||= Changeset.connection.select_rows("SELECT DISTINCT committer, user_id FROM #{Changeset.table_name} WHERE repository_id = #{id}")

  end

  # Maps committers username to a user ids

  def committer_ids=(h)

    if h.is_a?(Hash)

      committers.each do |committer, user_id|

        new_user_id = h[committer]

        if new_user_id && (new_user_id.to_i != user_id.to_i)

          new_user_id = (new_user_id.to_i > 0 ? new_user_id.to_i : nil)

          Changeset.update_all("user_id = #{ new_user_id.nil? ? 'NULL' : new_user_id }", ["repository_id = ? AND committer = ?", id, committer])

        end

      end

      @committers = nil

      @found_committer_users = nil

      true

    else

      false

    end

  end

  # Returns the Redmine User corresponding to the given +committer+

  # It will return nil if the committer is not yet mapped and if no User

  # with the same username or email was found

  def find_committer_user(committer)

    unless committer.blank?

      @found_committer_users ||= {}

      return @found_committer_users[committer] if @found_committer_users.has_key?(committer)

      user = nil

      c = changesets.find(:first, :conditions => {:committer => committer}, :include => :user)

      if c && c.user

        user = c.user

      elsif committer.strip =~ /^([^<]+)(<(.*)>)?$/

        username, email = $1.strip, $3

        u = User.find_by_login(username)

        u ||= User.find_by_mail(email) unless email.blank?

        user = u

      end

      @found_committer_users[committer] = user

      user

    end

  end

  # Fetches new changesets for all repositories of active projects

  # Can be called periodically by an external script

  # eg. ruby script/runner "Repository.fetch_changesets"

  def self.fetch_changesets

    Project.active.has_module(:repository).find(:all, :include => :repository).each do |project|

      if project.repository

        begin

          project.repository.fetch_changesets

        rescue Redmine::Scm::Adapters::CommandFailed => e

          logger.error "Repository: error during fetching changesets: #{e.message}"

        end

      end

    end

  end

  # scan changeset comments to find related and fixed issues for all repositories

  def self.scan_changesets_for_issue_ids

    find(:all).each(&:scan_changesets_for_issue_ids)

  end

  def self.scm_name

    'Abstract'

  end

  def self.available_scm

    subclasses.collect {|klass| [klass.scm_name, klass.name]}

  end

  def self.factory(klass_name, *args)

    klass = "Repository::#{klass_name}".constantize

    klass.new(*args)

  rescue

    nil

  end

  def clear_cache

    clear_changesets

  end

  private

  def before_save

    # Strips url and root_url

    url.strip!

    root_url.strip!

    true

  end

  def clear_changesets

    cs, ch, ci = Changeset.table_name, Change.table_name, "#{table_name_prefix}changesets_issues#{table_name_suffix}"

    connection.delete("DELETE FROM #{ch} WHERE #{ch}.changeset_id IN (SELECT #{cs}.id FROM #{cs} WHERE #{cs}.repository_id = #{id})")

    connection.delete("DELETE FROM #{ci} WHERE #{ci}.changeset_id IN (SELECT #{cs}.id FROM #{cs} WHERE #{cs}.repository_id = #{id})")

    connection.delete("DELETE FROM #{cs} WHERE #{cs}.repository_id = #{id}")

  end

end