class Riffer::Catalog

# File lib/riffer/catalog.rb, line 20
def self.load(paths)
  models = {} #: Hash[String, Hash[Symbol, untyped]]
  aliases = {} #: Hash[String, String]

  paths.each do |path|
    parse_file(path).each do |key, entry|
      layered = models[key] || { aliases: [] }
      layered = layered.merge(entry.slice(:pricing, :reasoning))
      layered[:aliases] = layered[:aliases] | entry[:aliases]
      models[key] = layered

      # A later file wins a claimed alias, so a user file can repoint one.
      entry[:aliases].each do |alias_key|
        previous = aliases[alias_key]
        previous_entry = models[previous] if previous && previous != key
        previous_entry[:aliases] -= [alias_key] if previous_entry
        aliases[alias_key] = key
      end
    end
  end

  aliases.each do |alias_key, key|
    next unless models.key?(alias_key)

    raise Riffer::ArgumentError, "catalog alias #{alias_key.inspect} on #{key.inspect} is also a model key"
  end

  new(models: models, aliases: aliases)
end

# File lib/riffer/catalog.rb, line 52
def initialize(models:, aliases:)
  @models = deep_freeze(models)
  @aliases = aliases.dup.freeze
  freeze
end

# File lib/riffer/catalog.rb, line 72
def empty?
  @models.empty?
end

# File lib/riffer/catalog.rb, line 66
def rates_for(key)
  entry(key)&.dig(:pricing)
end

# File lib/riffer/catalog.rb, line 60
def reasoning_options(key, level)
  entry(key)&.dig(:reasoning, level)
end