require "addressable/template"

class AltStyle < ApplicationRecord
  belongs_to :species
  belongs_to :color

  has_many :parent_swf_asset_relationships, as: :parent, dependent: :destroy
  has_many :swf_assets, through: :parent_swf_asset_relationships
  has_many :contributions, as: :contributed, inverse_of: :contributed

  validates :body_id, presence: true
  validates :series_name, presence: true, allow_nil: true
  validates :thumbnail_url, presence: true

  before_validation :infer_thumbnail_url, unless: :thumbnail_url?

  scope :matching_name, ->(series_name, color_name, species_name) {
    color = Color.find_by_name!(color_name)
    species = Species.find_by_name!(species_name)
    where(series_name:, color_id: color.id, species_id: species.id)
  }
  scope :by_creation_date, -> {
    order("DATE(created_at) DESC")
  }
  scope :unlabeled, -> { where(series_name: nil) }
  scope :newest, -> { order(created_at: :desc) }

  def pet_name
    I18n.translate('pet_types.human_name', color_human_name: color.human_name,
                   species_human_name: species.human_name)
  end

  alias_method :name, :pet_name

  # If the series_name hasn't yet been set manually by support staff, show the
  # string "<New?>" instead. But it won't be searchable by that string—that is,
  # `fits:<New?>-faerie-draik` intentionally will not work, and the canonical
  # filter name will be `fits:alt-style-IDNUMBER`, instead.
  def series_name
    real_series_name || AltStyle.placeholder_name
  end

  def real_series_name=(new_series_name)
    self[:series_name] = new_series_name
  end

  def real_series_name
    self[:series_name]
  end

  # You can use this to check whether `series_name` is returning the actual
  # value or its placeholder value.
  def real_series_name?
    real_series_name.present?
  end

  def adjective_name
    "#{series_name} #{color.human_name}"
  end

  def full_name
    "#{series_name} #{name}"
  end

  EMPTY_IMAGE_URL = "data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw=="
  def preview_image_url
    # Use the image URL for the first asset. Or, fall back to an empty image.
    swf_assets.first&.image_url || EMPTY_IMAGE_URL
  end

  # Given a list of items, return how they look on this alt style.
  def appearances_for(items, ...)
    Item.appearances_for(items, self, ...)
  end

  # At time of writing, most batches of Alt Styles thumbnails used a simple
  # pattern for the item thumbnail URL, but that's not always the case anymore.
  # For now, let's keep using this format as the default value when creating a
  # new Alt Style, but the database field can be manually overridden as needed!
  THUMBNAIL_URL_TEMPLATE = Addressable::Template.new(
    "https://images.neopets.com/items/{series}_{color}_{species}.gif"
  )
  DEFAULT_THUMBNAIL_URL = "https://images.neopets.com/items/mall_bg_circle.gif"
  def infer_thumbnail_url
    if real_series_name?
      self.thumbnail_url = THUMBNAIL_URL_TEMPLATE.expand(
        series: series_name.gsub(/\s+/, '').downcase,
        color: color.name.gsub(/\s+/, '').downcase,
        species: species.name.gsub(/\s+/, '').downcase,
      ).to_s
    else
      self.thumbnail_url = DEFAULT_THUMBNAIL_URL
    end
  end

  def real_thumbnail_url?
    thumbnail_url != DEFAULT_THUMBNAIL_URL
  end

  def self.placeholder_name
    "<New?>"
  end

  # For convenience in the console!
  def self.find_by_name(color_name, species_name)
    color = Color.find_by_name(color_name)
    species = Species.find_by_name(species_name)
    where(color_id: color, species_id: species).first
  end
end