class Hook < ActiveRecord::Base
  include Modules::Models::WebHooks
  include Modules::Models::UrlHelper
  include Rails.application.routes.url_helpers
  belongs_to :project

  before_validation :cleanup_data
  validates :project_id, :data, :presence => true
  validates :name, :presence => true, :inclusion => {:in => NAMES}

  attr_accessible :data, :name

  serialize :data,  Hash

  scope :for_name, lambda {|name| where(:name => name) if name.present? }

  def receive_issues(issue, action)
    pull = issue.pull_request
    return if action.to_sym == :create && pull
    default_url_options

    payload = meta(issue.project, issue.user)
    base_params = {
      :number => issue.serial_id,
      :state  => issue.status,
      :title  => issue.title,
      :body   => issue.body,
      :user   => {:login => issue.user.uname},
    }
    if pull
      total_commits = pull.repo.commits_between(pull.to_commit, pull.from_commit).count
      repo_owner = pull.to_project.owner.uname
      post 'pull_request', {
        :payload => payload.merge(
          :action => (pull.ready? ? 'opened' : pull.status),
          :pull_request  => base_params.merge(
            :commits  => total_commits,
            :head     => {:label => "#{pull.from_project.owner.uname}:#{pull.from_ref}"},
            :base     => {:label => "#{repo_owner}:#{pull.to_ref}"},
            :html_url => project_pull_request_url(pull.to_project, pull)
          )
        ).to_json
      }
    else
      post 'issues', {
        :payload => payload.merge(
          :action => (issue.closed? ? 'closed' : 'opened'),
          :issue  => base_params.merge(
            :html_url => project_issue_url(issue.project, issue)
          )
        ).to_json
      }
    end
  end
  later :receive_issues, :queue => :notification

  def receive_push(git_hook)
    default_url_options
    project = Project.find(git_hook['project']['project']['id'])
    user    = User.find(git_hook['user']['user']['id'])
    payload = meta(project, user)
    oldrev, newrev, change_type = git_hook.values_at *%w(oldrev newrev change_type)
    
    commits = []
    payload.merge!(:before => oldrev, :after => newrev)
    if %w(delete create).exclude? change_type
      payload.merge!(
        :compare  => diff_url(project, "#{oldrev[0..6]}...#{newrev[0..6]}")
      )
      if oldrev == newrev
        commits   = [project.repo.commit(newrev)]
        modified  = commits.first.stats.files.map{|f| f[0]}
      else
        commits = project.repo.commits_between(oldrev, newrev)
      end
    end

    post 'push', {
      :payload => payload.merge(
        :ref => git_hook['refname'],
        :commits => commits.map{ |commit|
          files = changed_files commit
          {
            :id         => commit.id,
            :message    => commit.message,
            :distinct   => true,
            :url        => commit_url(project, commit),
            :removed    => files[:removed],
            :added      => files[:added],
            :modified   => files[:modified],
            :timestamp  => commit.committed_date,
            :author => {:name => commit.committer.name, :email => commit.committer.email}
          }
        }
      ).to_json
    }
  end
  later :receive_push, :queue => :notification

  protected

  def post(action, params)
    github_services = APP_CONFIG['github_services']
    uri   = URI "http://#{github_services['ip']}:#{github_services['port']}/#{name}/#{action}"
    Net::HTTP.post_form uri, params.merge(:data => data.to_json)
  rescue # Dont care about it
  end

  def meta(project, user)
    {
      :repository => {
        :name  => project.name,
        :url   => project_url(project),
        :owner => { :login => project.owner.uname }
      },
      :sender => {:login => user.uname},
      :pusher => {:name => user.uname}
    }
  end

  def cleanup_data
    if self.name.present? && fields = SCHEMA[self.name.to_sym]
      new_data = {}
      fields.each{ |type, field| new_data[field] = self.data[field] }
      self.data = new_data
    end
  end

  def changed_files(commit)
    removed, added, modified = [], [], []
    commit.show.each do |diff|
      if diff.renamed_file
        added     << diff.b_path
        removed   << diff.a_path
      elsif diff.new_file
        added     << diff.b_path
      elsif diff.deleted_file
        removed   << diff.a_path
      else
        modified  << diff.a_path
      end
    end
    {:removed => removed, :added => added, :modified => modified}
  end

end