defmodule Odinsea.Channel.Client do
  @moduledoc """
  Client connection handler for game channel servers.
  Manages the game session state.
  """

  use GenServer, restart: :temporary

  require Logger

  alias Odinsea.Net.Packet.In
  alias Odinsea.Net.Opcodes
  alias Odinsea.Channel.Handler

  defstruct [:socket, :ip, :channel_id, :state, :character_id]

  def start_link({socket, channel_id}) do
    GenServer.start_link(__MODULE__, {socket, channel_id})
  end

  @impl true
  def init({socket, channel_id}) do
    {:ok, {ip, _port}} = :inet.peername(socket)
    ip_string = format_ip(ip)

    Logger.info("Channel #{channel_id} client connected from #{ip_string}")

    state = %__MODULE__{
      socket: socket,
      ip: ip_string,
      channel_id: channel_id,
      state: :connected,
      character_id: nil
    }

    send(self(), :receive)
    {:ok, state}
  end

  @impl true
  def handle_info(:receive, %{socket: socket} = state) do
    case :gen_tcp.recv(socket, 0, 30_000) do
      {:ok, data} ->
        new_state = handle_packet(data, state)
        send(self(), :receive)
        {:noreply, new_state}

      {:error, :closed} ->
        Logger.info("Channel #{state.channel_id} client disconnected: #{state.ip}")
        {:stop, :normal, state}

      {:error, reason} ->
        Logger.warning("Channel client error: #{inspect(reason)}")
        {:stop, :normal, state}
    end
  end

  @impl true
  def terminate(_reason, state) do
    if state.socket do
      :gen_tcp.close(state.socket)
    end

    :ok
  end

  defp handle_packet(data, state) do
    packet = In.new(data)

    case In.decode_short(packet) do
      {opcode, packet} ->
        Logger.debug("Channel #{state.channel_id} packet: opcode=0x#{Integer.to_string(opcode, 16)}")
        dispatch_packet(opcode, packet, state)

      :error ->
        Logger.warning("Failed to read packet opcode")
        state
    end
  end

  defp dispatch_packet(opcode, packet, state) do
    # Define opcodes for matching
    cp_general_chat = Opcodes.cp_general_chat()
    cp_party_chat = Opcodes.cp_party_chat()
    cp_whisper = Opcodes.cp_whisper()
    cp_move_player = Opcodes.cp_move_player()
    cp_change_map = Opcodes.cp_change_map()
    cp_change_keymap = Opcodes.cp_change_keymap()
    cp_skill_macro = Opcodes.cp_skill_macro()
    cp_close_range_attack = Opcodes.cp_close_range_attack()
    cp_ranged_attack = Opcodes.cp_ranged_attack()
    cp_magic_attack = Opcodes.cp_magic_attack()
    cp_take_damage = Opcodes.cp_take_damage()

    # Inventory opcodes
    cp_item_move = Opcodes.cp_item_move()
    cp_item_sort = Opcodes.cp_item_sort()
    cp_item_gather = Opcodes.cp_item_gather()
    cp_item_pickup = Opcodes.cp_item_pickup()
    cp_use_item = Opcodes.cp_use_item()
    cp_use_return_scroll = Opcodes.cp_use_return_scroll()
    cp_use_scroll = Opcodes.cp_use_upgrade_scroll()
    cp_use_cash_item = Opcodes.cp_use_cash_item()

    # NPC opcodes
    cp_npc_move = Opcodes.cp_npc_move()
    cp_npc_talk = Opcodes.cp_npc_talk()
    cp_npc_talk_more = Opcodes.cp_npc_talk_more()
    cp_npc_shop = Opcodes.cp_npc_shop()
    cp_storage = Opcodes.cp_storage()
    cp_quest_action = Opcodes.cp_quest_action()
    cp_repair = Opcodes.cp_repair()
    cp_repair_all = Opcodes.cp_repair_all()
    cp_update_quest = Opcodes.cp_update_quest()
    cp_use_item_quest = Opcodes.cp_use_item_quest()
    cp_public_npc = Opcodes.cp_public_npc()
    cp_use_scripted_npc_item = Opcodes.cp_use_scripted_npc_item()

    # Mob opcodes
    cp_move_life = Opcodes.cp_move_life()
    cp_auto_aggro = Opcodes.cp_auto_aggro()
    cp_mob_skill_delay_end = Opcodes.cp_mob_skill_delay_end()
    cp_mob_bomb = Opcodes.cp_mob_bomb()

    # Summon opcodes
    cp_move_summon = Opcodes.cp_move_summon()
    cp_summon_attack = Opcodes.cp_summon_attack()
    cp_damage_summon = Opcodes.cp_damage_summon()
    cp_sub_summon = Opcodes.cp_sub_summon()
    cp_remove_summon = Opcodes.cp_remove_summon()
    cp_move_dragon = Opcodes.cp_move_dragon()

    # Player operations
    cp_note_action = Opcodes.cp_note_action()
    cp_give_fame = Opcodes.cp_give_fame()
    cp_use_door = Opcodes.cp_use_door()
    cp_use_mech_door = Opcodes.cp_use_mech_door()
    cp_transform_player = Opcodes.cp_transform_player()
    cp_damage_reactor = Opcodes.cp_damage_reactor()
    cp_touch_reactor = Opcodes.cp_touch_reactor()
    cp_coconut = Opcodes.cp_coconut()
    cp_follow_request = Opcodes.cp_follow_request()
    cp_follow_reply = Opcodes.cp_follow_reply()
    cp_ring_action = Opcodes.cp_ring_action()
    cp_solomon = Opcodes.cp_solomon()
    cp_gach_exp = Opcodes.cp_gach_exp()
    cp_report = Opcodes.cp_report()
    cp_enter_pvp = Opcodes.cp_enter_pvp()
    cp_leave_pvp = Opcodes.cp_leave_pvp()
    cp_pvp_respawn = Opcodes.cp_pvp_respawn()
    cp_pvp_attack = Opcodes.cp_pvp_attack()

    # UI opcodes
    cp_cygnus_summon = Opcodes.cp_cygnus_summon()
    cp_game_poll = Opcodes.cp_game_poll()
    cp_ship_object = Opcodes.cp_ship_object()

    # BBS
    cp_bbs_operation = Opcodes.cp_bbs_operation()

    # Duey
    cp_duey_action = Opcodes.cp_duey_action()

    # Monster Carnival
    cp_monster_carnival = Opcodes.cp_monster_carnival()

    # Alliance
    cp_alliance_operation = Opcodes.cp_alliance_operation()
    cp_deny_alliance_request = Opcodes.cp_deny_alliance_request()

    # Item Maker / Crafting
    cp_item_maker = Opcodes.cp_item_maker()
    cp_use_recipe = Opcodes.cp_use_recipe()
    cp_make_extractor = Opcodes.cp_make_extractor()
    cp_use_bag = Opcodes.cp_use_bag()
    cp_start_harvest = Opcodes.cp_start_harvest()
    cp_stop_harvest = Opcodes.cp_stop_harvest()
    cp_profession_info = Opcodes.cp_profession_info()
    cp_craft_effect = Opcodes.cp_craft_effect()
    cp_craft_make = Opcodes.cp_craft_make()
    cp_craft_done = Opcodes.cp_craft_done()
    cp_use_pot = Opcodes.cp_use_pot()
    cp_clear_pot = Opcodes.cp_clear_pot()
    cp_feed_pot = Opcodes.cp_feed_pot()
    cp_cure_pot = Opcodes.cp_cure_pot()
    cp_reward_pot = Opcodes.cp_reward_pot()

    case opcode do
      # Chat handlers
      ^cp_general_chat ->
        case Handler.Chat.handle_general_chat(packet, state) do
          {:ok, new_state} -> new_state
          _ -> state
        end

      ^cp_party_chat ->
        case Handler.Chat.handle_party_chat(packet, state) do
          {:ok, new_state} -> new_state
          _ -> state
        end

      ^cp_whisper ->
        case Handler.Chat.handle_whisper(packet, state) do
          {:ok, new_state} -> new_state
          _ -> state
        end

      # Player movement and actions
      ^cp_move_player ->
        case Handler.Player.handle_move_player(packet, state) do
          {:ok, new_state} -> new_state
          _ -> state
        end

      ^cp_change_map ->
        case Handler.Player.handle_change_map(packet, state) do
          {:ok, new_state} -> new_state
          _ -> state
        end

      ^cp_change_keymap ->
        case Handler.Player.handle_change_keymap(packet, state) do
          {:ok, new_state} -> new_state
          _ -> state
        end

      ^cp_skill_macro ->
        case Handler.Player.handle_change_skill_macro(packet, state) do
          {:ok, new_state} -> new_state
          _ -> state
        end

      # Combat handlers (stubs for now)
      ^cp_close_range_attack ->
        case Handler.Player.handle_close_range_attack(packet, state) do
          {:ok, new_state} -> new_state
          _ -> state
        end

      ^cp_ranged_attack ->
        case Handler.Player.handle_ranged_attack(packet, state) do
          {:ok, new_state} -> new_state
          _ -> state
        end

      ^cp_magic_attack ->
        case Handler.Player.handle_magic_attack(packet, state) do
          {:ok, new_state} -> new_state
          _ -> state
        end

      ^cp_take_damage ->
        case Handler.Player.handle_take_damage(packet, state) do
          {:ok, new_state} -> new_state
          _ -> state
        end

      # Inventory handlers
      ^cp_item_move ->
        case Handler.Inventory.handle_item_move(packet, state) do
          {:ok, new_state} -> new_state
          _ -> state
        end

      ^cp_item_sort ->
        case Handler.Inventory.handle_item_sort(packet, state) do
          {:ok, new_state} -> new_state
          _ -> state
        end

      ^cp_item_gather ->
        case Handler.Inventory.handle_item_gather(packet, state) do
          {:ok, new_state} -> new_state
          _ -> state
        end

      ^cp_item_pickup ->
        case Handler.Pickup.handle_item_pickup(packet, state) do
          {:ok, new_state} -> new_state
          _ -> state
        end

      ^cp_use_item ->
        case Handler.Inventory.handle_use_item(packet, state) do
          {:ok, new_state} -> new_state
          _ -> state
        end

      ^cp_use_return_scroll ->
        case Handler.Inventory.handle_use_return_scroll(packet, state) do
          {:ok, new_state} -> new_state
          _ -> state
        end

      ^cp_use_scroll ->
        case Handler.Inventory.handle_use_scroll(packet, state) do
          {:ok, new_state} -> new_state
          _ -> state
        end

      ^cp_use_cash_item ->
        case Handler.Inventory.handle_use_cash_item(packet, state) do
          {:ok, new_state} -> new_state
          _ -> state
        end

      # NPC handlers
      ^cp_npc_move ->
        Handler.NPC.handle_npc_move(packet, self())
        state

      ^cp_npc_talk ->
        Handler.NPC.handle_npc_talk(packet, self())
        state

      ^cp_npc_talk_more ->
        Handler.NPC.handle_npc_more_talk(packet, self())
        state

      ^cp_npc_shop ->
        Handler.NPC.handle_npc_shop(packet, self())
        state

      ^cp_storage ->
        Handler.NPC.handle_storage(packet, self())
        state

      ^cp_quest_action ->
        Handler.NPC.handle_quest_action(packet, self())
        state

      ^cp_repair ->
        Handler.NPC.handle_repair(packet, self())
        state

      ^cp_repair_all ->
        Handler.NPC.handle_repair_all(self())
        state

      ^cp_update_quest ->
        Handler.NPC.handle_update_quest(packet, self())
        state

      ^cp_use_item_quest ->
        Handler.NPC.handle_use_item_quest(packet, self())
        state

      ^cp_public_npc ->
        Handler.NPC.handle_public_npc(packet, self())
        state

      ^cp_use_scripted_npc_item ->
        Handler.NPC.handle_use_scripted_npc_item(packet, self())
        state

      # Mob handlers
      ^cp_move_life ->
        Handler.Mob.handle_mob_move(packet, self())
        state

      ^cp_auto_aggro ->
        Handler.Mob.handle_auto_aggro(packet, self())
        state

      ^cp_mob_skill_delay_end ->
        Handler.Mob.handle_mob_skill_delay_end(packet, self())
        state

      ^cp_mob_bomb ->
        Handler.Mob.handle_mob_bomb(packet, self())
        state

      # Summon handlers
      ^cp_move_summon ->
        Handler.Summon.handle_move_summon(packet, self())
        state

      ^cp_summon_attack ->
        Handler.Summon.handle_summon_attack(packet, self())
        state

      ^cp_damage_summon ->
        Handler.Summon.handle_damage_summon(packet, self())
        state

      ^cp_sub_summon ->
        Handler.Summon.handle_sub_summon(packet, self())
        state

      ^cp_remove_summon ->
        Handler.Summon.handle_remove_summon(packet, self())
        state

      ^cp_move_dragon ->
        Handler.Summon.handle_move_dragon(packet, self())
        state

      # Player handlers
      ^cp_note_action ->
        Handler.Players.handle_note(packet, self())
        state

      ^cp_give_fame ->
        Handler.Players.handle_give_fame(packet, self())
        state

      ^cp_use_door ->
        Handler.Players.handle_use_door(packet, self())
        state

      ^cp_use_mech_door ->
        Handler.Players.handle_use_mech_door(packet, self())
        state

      ^cp_transform_player ->
        Handler.Players.handle_transform_player(packet, self())
        state

      ^cp_damage_reactor ->
        Handler.Players.handle_hit_reactor(packet, self())
        state

      ^cp_touch_reactor ->
        Handler.Players.handle_touch_reactor(packet, self())
        state

      ^cp_coconut ->
        Handler.Players.handle_hit_coconut(packet, self())
        state

      ^cp_follow_request ->
        Handler.Players.handle_follow_request(packet, self())
        state

      ^cp_follow_reply ->
        Handler.Players.handle_follow_reply(packet, self())
        state

      ^cp_ring_action ->
        Handler.Players.handle_ring_action(packet, self())
        state

      ^cp_solomon ->
        Handler.Players.handle_solomon(packet, self())
        state

      ^cp_gach_exp ->
        Handler.Players.handle_gach_exp(packet, self())
        state

      ^cp_report ->
        Handler.Players.handle_report(packet, self())
        state

      ^cp_enter_pvp ->
        Handler.Players.handle_enter_pvp(packet, self())
        state

      ^cp_leave_pvp ->
        Handler.Players.handle_leave_pvp(packet, self())
        state

      ^cp_pvp_respawn ->
        Handler.Players.handle_respawn_pvp(packet, self())
        state

      ^cp_pvp_attack ->
        Handler.Players.handle_attack_pvp(packet, self())
        state

      # UI handlers
      ^cp_cygnus_summon ->
        Handler.UI.handle_cygnus_summon(packet, self())
        state

      ^cp_game_poll ->
        Handler.UI.handle_game_poll(packet, self())
        state

      ^cp_ship_object ->
        Handler.UI.handle_ship_object(packet, self())
        state

      # BBS handler
      ^cp_bbs_operation ->
        Handler.BBS.handle_bbs_operation(packet, self())
        state

      # Duey handler
      ^cp_duey_action ->
        Handler.Duey.handle_duey_operation(packet, self())
        state

      # Monster Carnival handler
      ^cp_monster_carnival ->
        Handler.MonsterCarnival.handle_monster_carnival(packet, self())
        state

      # Alliance handlers
      ^cp_alliance_operation ->
        Handler.Alliance.handle_alliance(packet, self())
        state

      ^cp_deny_alliance_request ->
        Handler.Alliance.handle_deny_invite(packet, self())
        state

      # Item Maker handlers
      ^cp_item_maker ->
        Handler.ItemMaker.handle_item_maker(packet, self())
        state

      ^cp_use_recipe ->
        Handler.ItemMaker.handle_use_recipe(packet, self())
        state

      ^cp_make_extractor ->
        Handler.ItemMaker.handle_make_extractor(packet, self())
        state

      ^cp_use_bag ->
        Handler.ItemMaker.handle_use_bag(packet, self())
        state

      ^cp_start_harvest ->
        Handler.ItemMaker.handle_start_harvest(packet, self())
        state

      ^cp_stop_harvest ->
        Handler.ItemMaker.handle_stop_harvest(packet, self())
        state

      ^cp_profession_info ->
        Handler.ItemMaker.handle_profession_info(packet, self())
        state

      ^cp_craft_effect ->
        Handler.ItemMaker.handle_craft_effect(packet, self())
        state

      ^cp_craft_make ->
        Handler.ItemMaker.handle_craft_make(packet, self())
        state

      ^cp_craft_done ->
        Handler.ItemMaker.handle_craft_complete(packet, self())
        state

      ^cp_use_pot ->
        Handler.ItemMaker.handle_use_pot(packet, self())
        state

      ^cp_clear_pot ->
        Handler.ItemMaker.handle_clear_pot(packet, self())
        state

      ^cp_feed_pot ->
        Handler.ItemMaker.handle_feed_pot(packet, self())
        state

      ^cp_cure_pot ->
        Handler.ItemMaker.handle_cure_pot(packet, self())
        state

      ^cp_reward_pot ->
        Handler.ItemMaker.handle_reward_pot(packet, self())
        state

      _ ->
        Logger.debug("Unhandled channel opcode: 0x#{Integer.to_string(opcode, 16)}")
        state
    end
  end

  defp format_ip({a, b, c, d}) do
    "#{a}.#{b}.#{c}.#{d}"
  end

  defp format_ip({a, b, c, d, e, f, g, h}) do
    "#{a}:#{b}:#{c}:#{d}:#{e}:#{f}:#{g}:#{h}"
  end
end