defmodule Odinsea.Channel.Handler.UI do
  @moduledoc """
  Handles user interface interaction packets.

  Ported from: src/handling/channel/handler/UserInterfaceHandler.java

  ## Main Handlers
  - handle_cygnus_summon/2 - Cygnus/Aran first job advancement
  - handle_game_poll/2 - In-game poll
  - handle_ship_object/2 - Ship/boat object requests
  """

  require Logger

  alias Odinsea.Net.Packet.In
  alias Odinsea.Game.{Character, Map}
  alias Odinsea.Channel.Packets

  # ============================================================================
  # Job Advancement
  # ============================================================================

  @doc """
  Handles Cygnus/Aran summon NPC request (CP_CYGNUS_SUMMON / 0xC5).

  Opens the first job advancement NPC for Cygnus and Aran characters.
  - Job 2000 (Aran) → NPC 1202000
  - Job 1000 (Cygnus Knight) → NPC 1101008

  Reference: UserInterfaceHandler.CygnusSummon_NPCRequest()
  """
  def handle_cygnus_summon(_packet, client_pid) do
    case Character.get_state_by_client(client_pid) do
      {:ok, character_id, char_state} ->
        npc_id = case char_state.job do
          2000 -> 1202000  # Aran
          1000 -> 1101008  # Cygnus Knight
          _ -> nil
        end
        
        if npc_id do
          # TODO: Start NPC script
          # NPCScriptManager.getInstance().start(c, npc_id)
          Logger.debug("Cygnus/Aran summon NPC: #{npc_id} for character #{character_id}")
        else
          Logger.debug("Invalid job for Cygnus summon: #{char_state.job}, character #{character_id}")
        end
        
        :ok

      {:error, reason} ->
        Logger.warn("Failed to handle Cygnus summon: #{inspect(reason)}")
    end
  end

  # ============================================================================
  # Game Poll
  # ============================================================================

  @doc """
  Handles in-game poll (CP_GAME_POLL / 0xD4).

  Player submits response to server poll/questionnaire.

  Reference: UserInterfaceHandler.InGame_Poll()
  """
  def handle_game_poll(packet, client_pid) do
    # tick = In.decode_int(packet)
    selection = In.decode_int(packet)
    
    case Character.get_state_by_client(client_pid) do
      {:ok, character_id, char_state} ->
        # TODO: Validate poll is enabled
        # TODO: Validate selection is valid
        # TODO: Record poll response
        # TODO: Send reply packet
        
        Logger.debug("Game poll response: #{selection}, character #{character_id}")
        :ok

      {:error, reason} ->
        Logger.warn("Failed to handle game poll: #{inspect(reason)}")
    end
  end

  # ============================================================================
  # Ship/Boat Objects
  # ============================================================================

  @doc """
  Handles ship object request (CP_SHIP_OBJECT / 0x127).

  Client requests ship/boat status for station maps.
  Used for boats between continents (Ellinia-Orbis, etc.)

  Packet format varies by map:
  - BB 00 6C 24 05 06 00 - Ellinia
  - BB 00 6E 1C 4E 0E 00 - Leafre

  Reference: UserInterfaceHandler.ShipObjectRequest()
  """
  def handle_ship_object(packet, client_pid) do
    # Map ID is encoded in the packet in various ways
    # The full packet structure varies by client version
    
    case Character.get_state_by_client(client_pid) do
      {:ok, character_id, char_state} ->
        map_id = char_state.map
        
        # Determine ship effect based on map
        effect = get_ship_effect(map_id)
        
        # TODO: Check event manager for actual docked status
        # Boats/Trains/Geenie/Flight managers
        
        Logger.debug("Ship object request: map #{map_id}, effect #{effect}, character #{character_id}")
        
        # TODO: Send boat packet with effect
        # c.sendPacket(MaplePacketCreator.boatPacket(effect))
        
        :ok

      {:error, reason} ->
        Logger.warn("Failed to handle ship object: #{inspect(reason)}")
    end
  end

  # ============================================================================
  # Helper Functions
  # ============================================================================

  # Returns the ship effect value for a given map
  # Effect: 1 = Coming, 3 = Going, 1034 = Balrog
  defp get_ship_effect(map_id) do
    case map_id do
      # Ellinia Station >> Orbis
      101000300 -> 3
      # Orbis Station >> Ellinia  
      200000111 -> 3
      # Orbis Station >> Ludi
      200000121 -> 3
      # Ludi Station >> Orbis
      220000110 -> 3
      # Orbis Station >> Ariant
      200000151 -> 3
      # Ariant Station >> Orbis
      260000100 -> 3
      # Leafre Station >> Orbis
      240000110 -> 3
      # Orbis Station >> Leafre
      200000131 -> 3
      # During boat rides
      200090010 -> 1  # To Orbis
      200090000 -> 1  # To Ellinia
      _ -> 3  # Default: going
    end
  end
end