class MediaFile < ApplicationRecord
  # Base class for all media files (Video, Audio, etc.)
  # Uses Single Table Inheritance (STI) via the 'type' column
  self.table_name = 'videos'
  self.abstract_class = true

  include Streamable
  include Processable

  # Common JSON stores for flexible metadata
  store :fingerprints, accessors: [:xxhash64, :md5, :oshash, :phash]
  store :media_metadata, accessors: [:duration, :codec, :bit_rate, :format]

  # Common associations
  belongs_to :work
  belongs_to :storage_location
  has_many :playback_sessions, dependent: :destroy

  # Common validations
  validates :filename, presence: true
  validates :xxhash64, presence: true, uniqueness: { scope: :storage_location_id }

  # Common scopes
  scope :web_compatible, -> { where(web_compatible: true) }
  scope :needs_transcoding, -> { where(web_compatible: false) }
  scope :recent, -> { order(created_at: :desc) }

  # Common delegations
  delegate :display_title, to: :work, prefix: true, allow_nil: true

  # Common instance methods
  def display_title
    work&.display_title || filename
  end

  def full_file_path
    File.join(storage_location.path, filename)
  end

  def format_duration
    return "Unknown" unless duration

    hours = (duration / 3600).to_i
    minutes = ((duration % 3600) / 60).to_i
    seconds = (duration % 60).to_i

    if hours > 0
      "%d:%02d:%02d" % [hours, minutes, seconds]
    else
      "%d:%02d" % [minutes, seconds]
    end
  end

  # Template method for subclasses to override
  def web_stream_path
    # Default implementation - subclasses can override for specific behavior
    if transcoded_permanently? && transcoded_path && File.exist?(transcoded_full_path)
      return transcoded_full_path
    end
    if transcoded_path && File.exist?(temp_transcoded_full_path)
      return temp_transcoded_full_path
    end
    full_file_path if web_compatible?
  end

  def transcoded_full_path
    return nil unless transcoded_path
    File.join(storage_location.path, transcoded_path)
  end

  def temp_transcoded_full_path
    return nil unless transcoded_path
    File.join(Rails.root, 'tmp', 'transcodes', storage_location.id.to_s, transcoded_path)
  end
end