require 'debci'
require 'debci/user'
require 'debci/backend'
require 'debci/db'
require 'debci/package'
require 'debci/package_status'
require 'debci/test/duration'
require 'debci/test/paths'
require 'cgi'
require 'time'
require 'pathname'
require 'debci/validators'
require 'debci/worker'
require 'debci/runner'

module Debci
  class Job < ActiveRecord::Base
    PUBLIC_API = {
      trigger: 'the same string that was provided in the test submission. (string)',
      package: 'name of tested package (string)',
      arch: 'architecture where the test ran (string)',
      suite: 'suite where the test ran (string)',
      version: 'version of the package that was tested (string)',
      status: '"pass", "fail", or "tmpfail" (string), or *null* if the test didn\'t finish yet.',
      run_id: 'an id for the test run, generated by debci (integer)',
      is_private: 'bool value to specify whether test is private or not',
      extra_apt_sources: 'an array specifying extra apt sources added to `/etc/apt/sources.list.d` for the test.',
      updated_at: 'timestamp of the last update to the job (string)',
      date: 'timestamp of when the test run finished (string)',
      duration_seconds: 'duration of the test run, in seconds (integer)',
    }.freeze

    def public_api_attributes
      data = PUBLIC_API.to_h do |k, _|
        [k, self[k]]
      end
      data["package"] = package.name
      data
    end

    include Debci::Validators::APTSource

    belongs_to :package, class_name: 'Debci::Package'
    belongs_to :requestor, class_name: 'Debci::User', foreign_key: 'requestor_id'
    belongs_to :worker, class_name: 'Debci::Worker', foreign_key: 'worker_id'
    validates :requestor, presence: true
    validates(
      :requested_backend,
      inclusion: { in: ->(_) { Debci.config.backend_list } },
      allow_nil: true,
    )
    validates(
      :autopkgtest,
      inclusion: { in: ->(_) { Debci.config.autopkgtest_variants.keys } },
      allow_nil: true,
    )
    has_many :package_status, class_name: 'Debci::PackageStatus'

    scope :newsworthy, -> { not_pinned.where(['status in (?) AND previous_status in (?) and status != previous_status', ['pass', 'fail', 'neutral'], ['pass', 'fail', 'neutral']]) }

    scope :finished, -> { where('status is NOT NULL') }

    scope :not_pinned, -> { where('pin_packages is NULL') }

    scope :not_private, -> { where(is_private: false) }

    scope :reverse_history, -> { order(Arel.sql('date DESC NULLS FIRST')) }

    def pinned?
      !pin_packages.empty?
    end

    # FIXME: move to Debci::PackageStatus
    scope :status_on, lambda { |suite, arch|
      not_private.joins(:package_status, :package).where(packages: { removed: false }).where(['package_statuses.suite IN (?) AND package_statuses.arch IN (?)', suite, arch])
    }

    # FIXME: move to Debci::PackageStatus
    scope :all_status, lambda {
      status_on(
        Debci.config.suite_list,
        Debci.config.arch_list
      )
    }

    # FIXME: move to Debci::PackageStatus
    scope :tmpfail, -> { all_status.where(status: 'tmpfail') }

    # FIXME: move to Debci::PackageStatus
    scope :fail, -> { all_status.where(status: 'fail') }

    # FIXME: move to Debci::PackageStatus
    scope :visible, lambda {
      last_visible_time = Time.now - Debci.config.status_visible_days.days
      where('date > :time', time: last_visible_time)
    }

    # FIXME: move to Debci::PackageStatus
    scope :slow, lambda {
      all_status.where('duration_seconds > :time', time: Debci.config.slow_tests_duration_minutes.minutes.to_i)
    }

    after_save :update_package_status

    def update_package_status
      return if is_private
      return unless status
      return unless date
      return if pinned?

      transaction do
        next if history.where(['date > ?', date]).exists?

        status = Debci::PackageStatus.find_or_initialize_by(
          package: self.package,
          suite: self.suite,
          arch: self.arch,
        )
        status.job = self
        status.save!
      end

      nil
    end

    def self.platform_specific_issues
      all_status.includes(:package).where(
        packages: { removed: false }
      ).group_by(&:package).select do |_, statuses|
        statuses.map(&:status).uniq.size > 1
      end
    end

    include Debci::Test::Duration
    include Debci::Test::Paths

    serialize :pin_packages, type: Array
    serialize :extra_apt_sources, type: Array

    class InvalidStatusFile < RuntimeError; end

    def self.import(status_file)
      status = JSON.parse(File.read(status_file))
      run_id = status.delete('run_id').to_i
      package = status.delete('package')
      job = Debci::Job.find(run_id)
      if package != job.package.name
        raise InvalidStatusFile.new("Data in %{file} is for package %{pkg}, while database says that job %{id} is for package %{origpkg}" % {
          file: status_file,
          pkg: package,
          id: run_id,
          origpkg: job.package,
        })
      end
      status.each do |k, v|
        job.send("#{k}=", v)
      end

      job.save!
      job
    end

    def self.receive(directory)
      src = Pathname(directory)
      id = src.basename.to_s
      begin
        job = Debci::Job.find(id)
      rescue ActiveRecord::RecordNotFound
        nil
      else
        exitcode = src / 'exitcode'
        unless exitcode.exist?
          job.status = "tmpfail"
          job.message = "Invalid test results received"
          return job
        end
        job.status, job.message = status(exitcode.read.to_i)
        duration = (src / 'duration')
        if duration.exist?
          job.duration_seconds = duration.read.to_i
          job.date = duration.stat.mtime
        else
          job.duration_seconds = 0
          job.date = Time.now
        end

        worker_file = (src / 'worker')
        if worker_file.exist?
          job.worker = Debci::Worker.find_or_create_by!(name: worker_file.read.strip)
        end

        testpkg_version = src / 'testpkg-version'
        if testpkg_version.exist?
          job.version = testpkg_version.read.split.last if testpkg_version
        else
          job.version = 'n/a'
        end

        if job.previous
          job.previous_status = job.previous.status
        end
        if job.last_pass
          job.last_pass_date = job.last_pass.date
          job.last_pass_version = job.last_pass.version
        end

        dest = job.autopkgtest_data_dir
        dest.parent.mkpath

        # remove destination directory if it exists; this can happen is a
        # previous receiving was interrupted (e.g. if the daemon is restarte)
        dest.rmtree if dest.exist?

        FileUtils.cp_r src, dest
        Dir.chdir dest do
          artifacts = Dir['*'] - ['log.gz']
          cmd = ['tar', '-caf', 'artifacts.tar.gz', '--remove-files', '--', *artifacts]
          system(*cmd) || raise('Command failed: %<cmd>s' % { cmd: cmd.join(' ') })
        end
        job.calculate_file_sizes!

        job.received_at = Time.now

        job.save!

        # only remove original directory after everything went well
        src.rmtree
        job
      end
    end

    def autopkgtest_data_path
      @autopkgtest_data_path ||= File.join(suite, arch, package.prefix, package.name, id.to_s)
    end

    def autopkgtest_data_dir
      @autopkgtest_data_dir ||= Pathname(Debci.config.autopkgtest_basedir) / autopkgtest_data_path
    end

    attribute :files_purged, :boolean, default: false

    def cleanup(reason: "no reason given")
      self.purge_files
      self.update_columns(files_purged: true)
      Debci.log(
        'Cleaned up files for job %<job_id>s (%<job>s): %<reason>s' % {
          job_id: self.run_id,
          job: self,
          reason: reason,
        }
      )
    end

    def calculate_file_sizes!
      dir = self.autopkgtest_data_dir
      log = (dir / 'log.gz')
      self.log_size = log.size if log.exist?
      self.artifacts_size = (dir / 'artifacts.tar.gz').size
    end

    def disk_usage
      (self.log_size || 0) + (self.artifacts_size || 0)
    end

    def self.status(exit_code)
      case exit_code
      when 0
        ['pass', 'All tests passed']
      when 2
        ['pass', 'Tests passed, but at least one test skipped']
      when 4
        ['fail', 'Tests failed']
      when 6
        ['fail', 'Tests failed, and at least one test skipped']
      when 12, 14
        ['fail', 'Erroneous package']
      when 8
        ['neutral', 'No tests in this package or all skipped']
      when 16
        ['tmpfail', 'Could not run tests due to a temporary testbed failure']
      else
        ['tmpfail', "Unexpected autopkgtest exit code #{exit_code}"]
      end
    end

    def self.pending
      Debci::Job.includes(:requestor).not_private.where(status: nil).order(:created_at)
    end

    def self.history(package, suite, arch)
      Debci::Job.includes(:requestor).not_private.where(
        package: package,
        suite: suite,
        arch: arch
      )
    end

    def history
      @history ||= self.class.history(package, suite, arch).order('date')
    end

    def previous_unpinned_jobs
      @previous_unpinned_jobs ||= history.not_pinned.where(["date < ?", date])
    end

    def previous
      @previous ||= previous_unpinned_jobs.last
    end

    def last_pass
      @last_pass ||= previous_unpinned_jobs.where(status: 'pass').last
    end

    # Returns the amount of time since the date for this status object
    def time
      days = (Time.now - self.created_at)/86400

      if days >= 1 || days <= -1
        "#{days.floor} day(s) ago"
      else
        "#{Time.at(Time.now - self.created_at).gmtime.strftime('%H')} hour(s) ago"
      end
    end

    def as_json(options = nil)
      super.update(
        "duration_human" => self.duration_human,
        "package" => package.name,
      )
    end

    DEFAULT_PRIORITY = 5

    def enqueue(priority = nil)
      runner = Debci::Runner.get(self)

      self.selected_backend = runner.select_backend
      self.priority = priority || self.priority || DEFAULT_PRIORITY
      save!

      runner.submit
    end

    def backend
      selected_backend || requested_backend || Debci::Backend.default
    end

    def preferred_backend
      requested_backend || package&.backend
    end

    def retry
      new_job = Debci::Job.create!(
        package: self.package,
        suite: self.suite,
        arch: self.arch,
        autopkgtest: autopkgtest,
        requested_backend: requested_backend,
        requestor: self.requestor,
        trigger: self.trigger,
        pin_packages: self.pin_packages,
        is_private: self.is_private,
        extra_apt_sources: self.extra_apt_sources
      )
      new_job.enqueue
      new_job
    end

    def to_s
      "%s %s/%s (%s)" % [package.name, suite, arch, status || 'pending']
    end

    def title
      '%s %s' % [version, status]
    end

    def headline
      "#{package.name} #{version} #{status.upcase} on #{suite}/#{arch}"
    end

    def always_failing?
      last_pass_version.nil? || last_pass_version == 'n/a'
    end

    def had_success?
      !always_failing?
    end

  end
end

