defmodule ExIceberg.Table.ManifestsTable do
  @moduledoc """
  ManifestsTable provides access to table manifest information.

  This module allows you to inspect table manifests, which contain
  metadata about data files in the table.

  Similar to iceberg-rust's ManifestsTable functionality.
  """

  defstruct [:table_metadata]

  @type t :: %__MODULE__{
          table_metadata: map()
        }

  @doc """
  Creates a new ManifestsTable from table metadata.

  This is typically called by MetadataTable.manifests/1.
  """
  def new(table_metadata) do
    %__MODULE__{table_metadata: table_metadata}
  end

  @doc """
  Returns the schema of the manifests table.

  This describes the structure of manifest metadata that would be
  returned by scan operations.

  ## Examples

      schema = ExIceberg.Table.ManifestsTable.schema(manifests_table)
      # Returns schema information about manifest fields
  """
  def schema(%__MODULE__{}) do
    # For now, return a basic schema description
    # In the future, this could call into Rust to get the actual schema
    %{
      "fields" => [
        %{"name" => "content", "type" => "int", "required" => true},
        %{"name" => "path", "type" => "string", "required" => true},
        %{"name" => "length", "type" => "long", "required" => true},
        %{"name" => "partition_spec_id", "type" => "int", "required" => true},
        %{"name" => "added_snapshot_id", "type" => "long", "required" => true},
        %{"name" => "added_data_files_count", "type" => "int", "required" => false},
        %{"name" => "existing_data_files_count", "type" => "int", "required" => false},
        %{"name" => "deleted_data_files_count", "type" => "int", "required" => false},
        %{"name" => "partitions", "type" => "list<struct>", "required" => false}
      ]
    }
  end

  @doc """
  Returns basic information about available manifests.

  Note: This is a placeholder implementation. Full scan functionality
  would require additional Rust NIF functions to iterate through manifests.

  ## Examples

      info = ExIceberg.Table.ManifestsTable.info(manifests_table)
  """
  def info(%__MODULE__{}) do
    %{
      "description" => "Manifests table for inspecting data file metadata",
      "note" => "Full scan functionality requires additional implementation"
    }
  end
end
