# == Schema Information
#
# Table name: builds
#
#  id                 :integer          not null, primary key
#  project_id         :integer
#  status             :string(255)
#  finished_at        :datetime
#  trace              :text
#  created_at         :datetime
#  updated_at         :datetime
#  started_at         :datetime
#  runner_id          :integer
#  commit_id          :integer
#  coverage           :float
#  commands           :text
#  job_id             :integer
#  name               :string(255)
#  options            :text
#  allow_failure      :boolean          default(FALSE), not null
#  stage              :string(255)
#  deploy             :boolean          default(FALSE)
#  trigger_request_id :integer
#

class Build < ActiveRecord::Base
  LAZY_ATTRIBUTES = ['trace']

  belongs_to :commit
  belongs_to :project
  belongs_to :runner
  belongs_to :trigger_request

  serialize :options

  validates :commit, presence: true
  validates :status, presence: true
  validates :coverage, numericality: true, allow_blank: true

  scope :running, ->() { where(status: "running") }
  scope :pending, ->() { where(status: "pending") }
  scope :success, ->() { where(status: "success") }
  scope :failed, ->() { where(status: "failed")  }
  scope :unstarted, ->() { where(runner_id: nil) }
  scope :running_or_pending, ->() { where(status:[:running, :pending]) }

  acts_as_taggable

  # To prevent db load megabytes of data from trace
  default_scope -> { select(Build.columns_without_lazy) }

  class << self
    def columns_without_lazy
      (column_names - LAZY_ATTRIBUTES).map do |column_name|
        "#{table_name}.#{column_name}"
      end
    end

    def last_month
      where('created_at > ?', Date.today - 1.month)
    end

    def first_pending
      pending.unstarted.order('created_at ASC').first
    end

    def create_from(build)
      new_build = build.dup
      new_build.status = :pending
      new_build.runner_id = nil
      new_build.save
    end

    def retry(build)
      new_build = Build.new(status: :pending)
      new_build.options = build.options
      new_build.commands = build.commands
      new_build.tag_list = build.tag_list
      new_build.commit_id = build.commit_id
      new_build.project_id = build.project_id
      new_build.name = build.name
      new_build.allow_failure = build.allow_failure
      new_build.stage = build.stage
      new_build.trigger_request = build.trigger_request
      new_build.save
      new_build
    end
  end

  state_machine :status, initial: :pending do
    event :run do
      transition pending: :running
    end

    event :drop do
      transition running: :failed
    end

    event :success do
      transition running: :success
    end

    event :cancel do
      transition [:pending, :running] => :canceled
    end

    after_transition pending: :running do |build, transition|
      build.update_attributes started_at: Time.now
    end

    after_transition any => [:success, :failed, :canceled] do |build, transition|
      build.update_attributes finished_at: Time.now
      project = build.project

      if project.web_hooks?
        WebHookService.new.build_end(build)
      end

      if build.commit.success?
        build.commit.create_next_builds(build.trigger_request)
      end

      project.execute_services(build)

      if project.coverage_enabled?
        build.update_coverage
      end
    end

    state :pending, value: 'pending'
    state :running, value: 'running'
    state :failed, value: 'failed'
    state :success, value: 'success'
    state :canceled, value: 'canceled'
  end

  delegate :sha, :short_sha, :before_sha, :ref,
    to: :commit, prefix: false

  def trace_html
    html = Ansi2html::convert(trace) if trace.present?
    html ||= ''
  end

  def trace
    if project && read_attribute(:trace).present?
      read_attribute(:trace).gsub(project.token, 'xxxxxx')
    end
  end

  def started?
    !pending? && !canceled? && started_at
  end

  def active?
    running? || pending?
  end

  def complete?
    canceled? || success? || failed?
  end

  def ignored?
    failed? && allow_failure?
  end

  def timeout
    project.timeout
  end

  def variables
    yaml_variables + project_variables + trigger_variables
  end

  def duration
    if started_at && finished_at
      finished_at - started_at
    elsif started_at
      Time.now - started_at
    end
  end

  def project
    commit.project
  end

  def project_id
    commit.project_id
  end

  def project_name
    project.name
  end

  def repo_url
    project.repo_url_with_auth
  end

  def allow_git_fetch
    project.allow_git_fetch
  end

  def update_coverage
    coverage = extract_coverage(trace, project.coverage_regex)

    if coverage.is_a? Numeric
      update_attributes(coverage: coverage)
    end
  end

  def extract_coverage(text, regex)
    begin
      matches = text.gsub(Regexp.new(regex)).to_a.last
      coverage = matches.gsub(/\d+(\.\d+)?/).first

      if coverage.present?
        coverage.to_f
      end
    rescue => ex
      # if bad regex or something goes wrong we dont want to interrupt transition
      # so we just silentrly ignore error for now
    end
  end

  def trace
    if File.exist?(path_to_trace)
      File.read(path_to_trace)
    else
      # backward compatibility
      read_attribute :trace
    end
  end

  def trace=(trace)
    unless Dir.exists? dir_to_trace
      FileUtils.mkdir_p dir_to_trace
    end

    File.write(path_to_trace, trace)
  end

  def dir_to_trace
    File.join(
      Settings.gitlab_ci.builds_path,
      created_at.utc.strftime("%Y_%m"),
      project.id.to_s
    )
  end

  def path_to_trace
    "#{dir_to_trace}/#{id}.log"
  end

  private

  def yaml_variables
    if commit.config_processor
      commit.config_processor.variables.map do |key, value|
        { key: key, value: value, public: true }
      end
    else
      []
    end
  end

  def project_variables
    project.variables.map do |variable|
      { key: variable.key, value: variable.value, public: false }
    end
  end

  def trigger_variables
    if trigger_request && trigger_request.variables
      trigger_request.variables.map do |key, value|
        { key: key, value: value, public: false }
      end
    else
      []
    end
  end
end