# encoding: utf-8
# frozen_string_literal: true
#
# Redmine plugin for Document Management System "Features"
#
# Copyright © 2011-21 Karel Pičman <karel.picman@kontron.com>
#
# 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 DmsfWorkflow < ActiveRecord::Base

  has_many :dmsf_workflow_steps, -> { order(step: :asc, operator: :desc) }, dependent: :destroy
  belongs_to :author, class_name: 'User'

  scope :sorted, lambda { order(name: :asc) }
  scope :global, lambda { where(project_id: nil) }
  scope :active, lambda { where(status: STATUS_ACTIVE) }
  scope :status, lambda { |arg| where(arg.blank? ? nil : { status: arg.to_i }) }

  validates :name, presence: true, length: { maximum: 255 }, dmsf_workflow_name: true

  STATE_ASSIGNED = 3
  STATE_WAITING_FOR_APPROVAL = 1
  STATE_APPROVED = 2
  STATE_REJECTED = 4
  STATE_OBSOLETE = 5

  STATUS_LOCKED = 0
  STATUS_ACTIVE = 1

  def self.workflow_str(workflow)
    case workflow
    when STATE_WAITING_FOR_APPROVAL
      l(:title_waiting_for_approval)
    when STATE_APPROVED
      l(:title_approved)
    when STATE_ASSIGNED
      l(:title_assigned)
    when STATE_REJECTED
      l(:title_rejected)
    when DmsfWorkflow::STATE_OBSOLETE
      l(:title_obsolete)
    end
  end

  def participiants
    users = Array.new
    dmsf_workflow_steps.each do |step|
      users << step.user unless users.include? step.user
    end
    users
  end

  def self.workflows(project)
    where(project_id: project)
  end

  def project
    Project.find_by(id: project_id) if project_id
  end

  def to_s
    name
  end

  def reorder_steps(step, move_to)
    DmsfWorkflow.transaction do
        dmsf_workflow_steps.each do |ws|
          if ws.step == step
            return false unless ws.update_attribute('step', move_to)
          elsif ws.step >= move_to && ws.step < step
            # Move up
            return false unless ws.update_attribute('step', ws.step + 1)
          elsif ws.step <= move_to && ws.step > step
            # Move down
            return false unless ws.update_attribute('step', ws.step - 1)
          end
        end
      end
    true
  end

  def delegates(q, dmsf_workflow_step_assignment_id, dmsf_file_revision_id)
    if dmsf_workflow_step_assignment_id && dmsf_file_revision_id
      sql = [
        'id NOT IN (SELECT a.user_id FROM dmsf_workflow_step_assignments a WHERE id = ?) AND id IN (SELECT m.user_id FROM members m JOIN dmsf_files f ON f.project_id = m.project_id JOIN dmsf_file_revisions r ON r.dmsf_file_id = f.id WHERE r.id = ?)',
        dmsf_workflow_step_assignment_id, dmsf_file_revision_id]
    elsif project
      sql = ['id IN (SELECT user_id FROM members WHERE project_id = ?)', project.id]
    else
      sql = '1=1'
    end

    if q.present?
      User.active.sorted.where(sql).like(q)
    else
      User.active.sorted.where(sql)
    end
  end

  def next_assignments(dmsf_file_revision_id)
    results = Array.new
    nsteps = dmsf_workflow_steps.collect{ |s| s.step }.uniq
    nsteps.each do |i|
      step_is_finished = false
      steps = dmsf_workflow_steps.collect{ |s| s.step == i ? s : nil }.compact
      steps.each do |step|
        step.dmsf_workflow_step_assignments.where(dmsf_file_revision_id: dmsf_file_revision_id).find_each do |assignment|
          assignment.dmsf_workflow_step_actions.find_each do |action|
            case action.action
            when DmsfWorkflowStepAction::ACTION_APPROVE
              step_is_finished = true
              # Try to find another unfinished AND step
              exists = false
              stps = dmsf_workflow_steps.collect{ |s| (s.step == i && s.operator == DmsfWorkflowStep::OPERATOR_AND) ? s : nil }.compact
              stps.each do |s|
                s.dmsf_workflow_step_assignments.where(dmsf_file_revision_id: dmsf_file_revision_id).find_each do |a|
                  exists = a.add?(dmsf_file_revision_id)
                  break if exists
                end
                break if exists
              end
              step_is_finished = false if exists
              break
            when DmsfWorkflowStepAction::ACTION_REJECT
              return Array.new
            end
          end
          break if step_is_finished
        end
        break if step_is_finished
      end
      unless step_is_finished
        steps.each do |step|
          step.dmsf_workflow_step_assignments.where(dmsf_file_revision_id: dmsf_file_revision_id).find_each do |assignment|
            results << assignment if assignment.add?(dmsf_file_revision_id)
          end
        end
        return results
      end
    end
    results
  end

  def assign(dmsf_file_revision_id)
    dmsf_workflow_steps.each do |ws|
      ws.assign(dmsf_file_revision_id)
    end
  end

  def try_finish(revision, action, user_id)
    case action.action
    when DmsfWorkflowStepAction::ACTION_APPROVE
        assignments = next_assignments(revision.id)
        return false unless assignments.empty?
        revision.workflow = DmsfWorkflow::STATE_APPROVED
        revision.save!
        return true
      when DmsfWorkflowStepAction::ACTION_REJECT
        revision.workflow = DmsfWorkflow::STATE_REJECTED
        revision.save!
        return true
      when DmsfWorkflowStepAction::ACTION_DELEGATE
        dmsf_workflow_steps.each do |step|
          step.dmsf_workflow_step_assignments.each do |assignment|
            if assignment.id == action.dmsf_workflow_step_assignment_id
              assignment.user_id = user_id
              assignment.save!
              return false
            end
          end
        end
    end
    false
  end

  def copy_to(project, name = nil)
    new_wf = dup
    new_wf.name = name if name
    new_wf.project_id = project ? project.id : nil
    new_wf.author = User.current
    if new_wf.save
      dmsf_workflow_steps.each do |step|
        step.copy_to(new_wf)
      end
    end
    new_wf
  end

  def locked?
    status == STATUS_LOCKED
  end

  def active?
    status == STATUS_ACTIVE
  end

  def notify_users(project, revision, controller)
    assignments = next_assignments(revision.id)
    recipients = assignments.collect{ |a| a.user }
    recipients.uniq!
    recipients = recipients & DmsfMailer.get_notify_users(project, [revision.dmsf_file], true)
    DmsfMailer.deliver_workflow_notification(
        recipients,
        self,
        revision,
        :text_email_subject_started,
        :text_email_started,
        :text_email_to_proceed,
        nil,
        assignments.first&.dmsf_workflow_step)
    if Setting.plugin_redmine_dmsf['dmsf_display_notified_recipients']
      unless recipients.blank?
        to = recipients.collect{ |r| h(r.name) }.first(DMSF_MAX_NOTIFICATION_RECEIVERS_INFO).join(', ')
        to << ((recipients.count > DMSF_MAX_NOTIFICATION_RECEIVERS_INFO) ? ',...' : '.')
        controller.flash[:warning] = l(:warning_email_notifications, to: to) if controller
      end
    end
  end
  
end