module Ecom
  module Core
    class TaskStep < ApplicationRecord
      include Filterable

      before_save :update_task_progress

      scope :filter_by_condition, ->(condition) { where(condition) }

      validates :name, :total_contribution_percentage_to_task, presence: true
      validates_with DateRangeValidator
      validate :date_range_validator
      validates_numericality_of :total_contribution_percentage_to_task,
                                greater_than: 0,
                                less_than_or_equal_to: 100

      validate :task_step_percentage_validator, on: :create

      validate :task_step_in_task_template_inclusion_validator

      belongs_to :task
      has_many :dependent_task_steps,
               class_name: 'Ecom::Core::TaskStepDependency', foreign_key: 'dependent_task_step_id'
      has_many :dependee_task_steps,
               class_name: 'Ecom::Core::TaskStepDependency', foreign_key: 'dependee_task_step_id'

      def date_range_validator
        task_ = Ecom::Core::Task.find_by(id: task_id)

        return if task_.nil?

        if !start_date.nil? && start_date < task_.start_date
          errors.add(:start_date, "The task steps start date can not be before the task's start date")
        end

        return unless !end_date.nil? && end_date > task_.end_date

        errors.add(:end_date, "The task steps end date can not be after the task's end date")
      end

      def task_step_percentage_validator
        return if task_id.nil?

        task = Ecom::Core::Task.find_by(id: task_id)

        return if task.nil?

        total_contribution_of_all_task_steps = task.task_steps.sum(:total_contribution_percentage_to_task)

        max_total_contribution = 100 - total_contribution_of_all_task_steps
        return unless total_contribution_percentage_to_task > max_total_contribution

        errors
          .add(:total_contribution_of_all_task_steps,
               "The maximum that this task step can contribute to the total task is #{max_total_contribution}")
      end

      def update_task_progress
        return unless completed_changed? && completed == true

        # update the task progress
        task = self.task
        percent_completed = task.percent_completed
        task.percent_completed = (percent_completed + total_contribution_percentage_to_task).to_i
        task.save
      end

      def task_step_in_task_template_inclusion_validator
        return if task_id.nil?

        task = Ecom::Core::Task.find_by(id: task_id)

        return if task.nil?

        task_template = task.task_template

        return unless task_template.task_steps.nil?

        errors.add(:base,
                   'Task steps are not defined for the given task in the
           task template, please first define the task steps in the task template.')
      end
    end
  end
end