module RBS
  module Collection
    class Config
      # Lockfile represents the `rbs_collection.lock.yaml`, that contains configurations and *resolved* gems with their sources
      #
      class Lockfile
        # Data structure stored in `rbs_collection.lock.yaml`
        #
        type lockfile_data = {
          "sources" => Array[Sources::Git::source_entry]?,   # null if empty
          "path" => String,
          "gems" => Array[library_data]?,         # null if empty
          "gemfile_lock_path" => String?          # gemfile_lock_path is optional because older versions doesn't have it
        }

        type library_data = {
          'name' => String,
          'version' => String,
          'source' => Sources::source_entry
        }

        # In-memory data structure that represents a library
        #
        type library = {
          name: String,
          version: String,
          source: Sources::t
        }

        attr_reader lockfile_path: Pathname

        # Path of the directory where lockfile is saved in
        #
        # `lockfile_path.parent`
        #
        attr_reader lockfile_dir: Pathname

        # Relative to lockfile_dir
        #
        attr_reader path: Pathname

        # Relative to lockfile_dir
        #
        attr_reader gemfile_lock_path: Pathname?

        attr_reader sources: Hash[String, Sources::Git]

        attr_reader gems: Hash[String, library]

        def initialize: (lockfile_path: Pathname, path: Pathname, gemfile_lock_path: Pathname?) -> void

        # `lockfile_dir` + `path`
        #
        def fullpath: () -> Pathname

        # `lockfile_dir` + `gemfile_lock_path`
        #
        %a{pure} def gemfile_lock_fullpath: () -> Pathname?

        def to_lockfile: () -> lockfile_data

        def each_source: () { (Sources::t) -> void } -> void
                       | () -> Enumerator[Sources::t, void]

        def self.from_lockfile: (lockfile_path: Pathname, data: lockfile_data) -> Lockfile

        # Validates if directories are set up correctly
        #
        # * Ensures if `path` is a directory
        # * Ensures if `git` sources are set up correctly
        #
        def check_rbs_availability!: () -> void

        private

        def library_data: (library) -> library_data
      end
    end
  end
end