# Ruby To-Do List Application - Category Model
# Created by: Molla Samser (help@rskworld.in, +91 93305 39277)
# Address: Nutanhat, Mongolkote, Purba Burdwan, West Bengal, India, 713147
# Year: 2026

class Category < ApplicationRecord
  # Associations
  belongs_to :user
  has_many :tasks, dependent: :nullify

  # Validations
  validates :name, presence: true, length: { minimum: 1, maximum: 50 }
  validates :name, uniqueness: { scope: :user_id, case_sensitive: false }
  validates :color, presence: true, format: { with: /\A#[0-9a-fA-F]{6}\z/, message: "must be a valid hex color code" }

  # Default categories to create for new users
  DEFAULT_CATEGORIES = [
    { name: 'Work', color: '#007bff' },
    { name: 'Personal', color: '#28a745' },
    { name: 'Shopping', color: '#ffc107' },
    { name: 'Health', color: '#dc3545' },
    { name: 'Education', color: '#6f42c1' }
  ]

  # Methods
  def task_count
    tasks.count
  end

  def completed_task_count
    tasks.where(completed: true).count
  end

  def pending_task_count
    tasks.where(completed: false).count
  end

  # Class methods
  def self.create_defaults_for(user)
    DEFAULT_CATEGORIES.each do |category_attrs|
      user.categories.create!(category_attrs)
    end
  end
end