defmodule Odinsea.Net.PacketLogger do
  @moduledoc """
  Comprehensive packet logging system for debugging MapleStory protocol.

  Provides detailed packet logging similar to the Java version with:
  - Direction (client/loopback)
  - Opcode name and value (decimal/hex)
  - Raw hex data
  - ASCII text representation
  - Context information (session, thread)
  """

  require Logger

  alias Odinsea.Net.{Hex, Opcodes}

  @doc """
  Logs an incoming client packet with full details.

  ## Parameters
  - `opcode` - The packet opcode (integer)
  - `data` - The packet data (binary, excluding opcode bytes)
  - `context` - Map with :ip, :server_type, etc.
  """
  def log_client_packet(opcode, data, context \\ %{}) do
    if packet_logging_enabled?() do
      opcode_name = get_client_opcode_name(opcode)
      ip = Map.get(context, :ip, "unknown")
      server_type = Map.get(context, :server_type, :unknown)

      # Format opcode header
      opcode_header = format_opcode_header("client", opcode_name, opcode)

      # Full packet data includes opcode
      full_data = <<opcode::little-16>> <> data

      # Format hex and text
      hex_str = Hex.encode(full_data)
      text_str = Hex.to_ascii(full_data)

      # Log the packet
      Logger.info("""
      #{opcode_header}
      [Data] #{hex_str}
      [Text] #{text_str}
      [Context] IP=#{ip} Server=#{server_type} Size=#{byte_size(full_data)} bytes
      """)

      :ok
    else
      :ok
    end
  end

  @doc """
  Logs an outgoing server packet with full details.

  ## Parameters
  - `opcode` - The packet opcode (integer)
  - `data` - The packet data (binary, excluding opcode bytes)
  - `context` - Map with :ip, :server_type, etc.
  """
  def log_server_packet(opcode, data, context \\ %{}) do
    if packet_logging_enabled?() do
      opcode_name = get_server_opcode_name(opcode)
      ip = Map.get(context, :ip, "unknown")
      server_type = Map.get(context, :server_type, :unknown)

      # Format opcode header
      opcode_header = format_opcode_header("loopback", opcode_name, opcode)

      # Full packet data includes opcode
      full_data = <<opcode::little-16>> <> data

      # Format hex and text
      hex_str = Hex.encode(full_data)
      text_str = Hex.to_ascii(full_data)

      # Log the packet
      Logger.info("""
      #{opcode_header}
      [Data] #{hex_str}
      [Text] #{text_str}
      [Context] IP=#{ip} Server=#{server_type} Size=#{byte_size(full_data)} bytes
      """)

      :ok
    else
      :ok
    end
  end

  @doc """
  Logs raw packet data (used for handshake/hello packets that don't follow normal format).
  """
  def log_raw_packet(direction, label, data, context \\ %{}) do
    if packet_logging_enabled?() do
      ip = Map.get(context, :ip, "unknown")

      data = IO.iodata_to_binary(data)
      hex_str = Hex.encode(data)
      text_str = Hex.to_ascii(data)

      Logger.info("""
      [#{direction}] [#{label}]
      [Data] #{hex_str}
      [Text] #{text_str}
      [Context] IP=#{ip} Size=#{byte_size(data)} bytes
      """)

      :ok
    else
      :ok
    end
  end

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

  defp packet_logging_enabled? do
    features = Application.get_env(:odinsea, :features, [])
    Keyword.get(features, :log_packet, false)
  end

  defp format_opcode_header(direction, opcode_name, opcode) do
    opcode_hex = Integer.to_string(opcode, 16) |> String.upcase() |> String.pad_leading(2, "0")
    "[#{direction}] [#{opcode_name}] #{opcode} / 0x#{opcode_hex}"
  end

  # ==================================================================================================
  # Opcode Name Resolution
  # ==================================================================================================

  defp get_client_opcode_name(opcode) do
    case opcode do
      # Connection/Security
      0x16 -> "CP_AliveAck"

      # Login/Account
      0x01 -> "CP_PermissionRequest"
      0x02 -> "CP_CheckPassword"
      0x04 -> "CP_ServerlistRequest"
      0x05 -> "CP_SelectWorld"
      0x06 -> "CP_CheckUserLimit"
      0x0E -> "CP_CheckCharName"
      0x12 -> "CP_CreateChar"
      0x14 -> "CP_CreateUltimate"
      0x15 -> "CP_DeleteChar"
      0x17 -> "CP_ExceptionLog"
      0x18 -> "CP_SecurityPacket"
      0x19 -> "CP_CharSelect"
      0x1A -> "CP_AuthSecondPassword"
      0x1D -> "CP_ClientDumpLog"
      0x1E -> "CP_CreateSecurityHandle"
      0x20 -> "RSA_KEY"
      0x5001 -> "CP_HardwareInfo"
      0x5004 -> "CP_WindowFocus"

      # Migration/Channel
      0x0D -> "CP_PlayerLoggedIn"
      0x23 -> "CP_ChangeMap"
      0x24 -> "CP_ChangeChannel"
      0x25 -> "CP_EnterCashShop"
      0x26 -> "CP_EnterPvp"
      0x27 -> "CP_EnterPvpParty"
      0x29 -> "CP_LeavePvp"
      0xB4 -> "CP_EnterMts"

      # Player Movement/Actions
      0x2A -> "CP_MovePlayer"
      0x2C -> "CP_CancelChair"
      0x2D -> "CP_UseChair"
      0x2F -> "CP_CloseRangeAttack"
      0x30 -> "CP_RangedAttack"
      0x31 -> "CP_MagicAttack"
      0x32 -> "CP_PassiveEnergy"
      0x34 -> "CP_TakeDamage"
      0x35 -> "CP_PvpAttack"
      0x36 -> "CP_GeneralChat"
      0x37 -> "CP_CloseChalkboard"
      0x38 -> "CP_FaceExpression"
      0x75 -> "CP_CharInfoRequest"
      0x76 -> "CP_SpawnPet"
      0x78 -> "CP_CancelDebuff"

      # NPC Interaction
      0x40 -> "CP_NpcTalk"
      0x41 -> "CP_NpcMove"
      0x42 -> "CP_NpcTalkMore"
      0x43 -> "CP_NpcShop"
      0x44 -> "CP_Storage"
      0x45 -> "CP_UseHiredMerchant"
      0x47 -> "CP_MerchItemStore"

      # Inventory/Items
      0x4D -> "CP_ItemSort"
      0x4E -> "CP_ItemGather"
      0x4F -> "CP_ItemMove"
      0x53 -> "CP_UseItem"
      0x10C -> "CP_ItemPickup"

      # Stats/Skills
      0x6A -> "CP_DistributeAp"
      0x6B -> "CP_AutoAssignAp"
      0x6E -> "CP_DistributeSp"
      0x6F -> "CP_SpecialMove"

      # Social
      0xA0 -> "CP_PartyChat"
      0xA1 -> "CP_Whisper"
      0xA4 -> "CP_PartyOperation"
      0xA8 -> "CP_GuildOperation"

      # Cash Shop
      0x135 -> "CP_CsUpdate"
      0x136 -> "CP_BuyCsItem"
      0x137 -> "CP_CouponCode"

      # Custom
      0x5002 -> "CP_InjectPacket"
      0x5003 -> "CP_SetCodePage"

      _ -> "UNKNOWN"
    end
  end

  defp get_server_opcode_name(opcode) do
    case opcode do
      # General
      0x0D -> "LP_AliveReq"
      0x0C -> "LP_ChangeChannel"
      0x15 -> "LP_LatestConnectedWorld"
      0x16 -> "LP_RecommendWorldMessage"

      # Login
      0x00 -> "HELLO"
      0x01 -> "LOGIN_STATUS"
      0x03 -> "LP_ServerStatus"
      0x06 -> "SERVERLIST"
      0x07 -> "LP_CharList"
      0x08 -> "LP_ServerIp"
      0x09 -> "LP_CharNameResponse"
      0x0A -> "LP_AddNewCharEntry"
      0x0B -> "LP_DeleteCharResponse"
      0x10 -> "LP_ChannelSelected"
      0x12 -> "LP_RelogResponse"
      0x13 -> "RSA_KEY"
      0x17 -> "LOGIN_AUTH"
      0x18 -> "LP_SecondPwError"

      # Inventory/Stats
      0x19 -> "LP_ModifyInventoryItem"
      0x1A -> "LP_UpdateInventorySlot"
      0x1B -> "LP_UpdateStats"
      0x1C -> "LP_GiveBuff"
      0x1D -> "LP_CancelBuff"
      0x20 -> "LP_UpdateSkills"
      0x22 -> "LP_FameResponse"
      0x23 -> "LP_ShowStatusInfo"
      0x25 -> "LP_TrockLocations"

      # Social/Party/Guild
      0x38 -> "LP_PartyOperation"
      0x3A -> "LP_ExpeditionOperation"
      0x3B -> "LP_BuddyList"
      0x3D -> "LP_GuildOperation"
      0x3E -> "LP_AllianceOperation"

      # Map Effects/Environment
      0x3F -> "LP_SpawnPortal"
      0x40 -> "LP_MechPortal"
      0x41 -> "LP_ServerMessage"
      0x4A -> "LP_YellowChat"

      # Family
      0x6D -> "LP_SendPedigree"
      0x6E -> "LP_OpenFamily"
      0x73 -> "LP_Family"

      # Misc UI/Messages
      0x7E -> "LP_TopMsg"
      0x7F -> "LP_MidMsg"
      0x80 -> "LP_ClearMidMsg"

      # Warps/Shops
      0x90 -> "LP_WarpToMap"
      0x91 -> "LP_MtsOpen"
      0x92 -> "LP_CsOpen"

      # Effects
      0x99 -> "LP_ShowEquipEffect"
      0x9A -> "LP_MultiChat"
      0x9B -> "LP_Whisper"
      0xA1 -> "LP_MapEffect"
      0xA6 -> "LP_Clock"

      # Players
      0xB8 -> "LP_SpawnPlayer"
      0xB9 -> "LP_RemovePlayerFromMap"
      0xBA -> "LP_ChatText"
      0xBC -> "LP_Chalkboard"

      # Pets
      0xD1 -> "LP_SpawnPet"
      0xD4 -> "LP_MovePet"
      0xD5 -> "LP_PetChat"

      # Player Actions
      0xE2 -> "LP_MovePlayer"
      0xE4 -> "LP_CloseRangeAttack"
      0xE5 -> "LP_RangedAttack"
      0xE6 -> "LP_MagicAttack"
      0xE8 -> "LP_SkillEffect"
      0xEB -> "LP_DamagePlayer"
      0xEC -> "LP_FacialExpression"
      0xF0 -> "LP_ShowChair"
      0xF1 -> "LP_UpdateCharLook"

      # Summons
      0x131 -> "LP_SpawnSummon"
      0x132 -> "LP_RemoveSummon"
      0x133 -> "LP_MoveSummon"
      0x134 -> "LP_SummonAttack"

      # Monsters
      0x13A -> "LP_SpawnMonster"
      0x13B -> "LP_KillMonster"
      0x13C -> "LP_SpawnMonsterControl"
      0x13D -> "LP_MoveMonster"
      0x144 -> "LP_DamageMonster"

      # NPCs
      0x156 -> "LP_SpawnNpc"
      0x157 -> "LP_RemoveNpc"
      0x158 -> "LP_SpawnNpcRequestController"
      0x159 -> "LP_NpcAction"
      0x1A3 -> "LP_NpcTalk"
      0x1A5 -> "LP_OpenNpcShop"

      # Merchants
      0x161 -> "LP_SpawnHiredMerchant"
      0x162 -> "LP_DestroyHiredMerchant"

      # Map Objects
      0x165 -> "LP_DropItemFromMapObject"
      0x167 -> "LP_RemoveItemFromMap"
      0x16B -> "LP_SpawnMist"
      0x16C -> "LP_RemoveMist"
      0x16D -> "LP_SpawnDoor"
      0x16E -> "LP_RemoveDoor"

      # Reactors
      0x171 -> "LP_ReactorHit"
      0x173 -> "LP_ReactorSpawn"
      0x174 -> "LP_ReactorDestroy"

      # NPC/Shop Interactions
      0x1A6 -> "LP_ConfirmShopTransaction"
      0x1A9 -> "LP_OpenStorage"
      0x1AB -> "LP_MerchItemStore"

      # Cash Shop
      0x1B8 -> "LP_CsUpdate"
      0x1B9 -> "LP_CsOperation"

      # Input
      0x1C5 -> "LP_Keymap"

      # Custom
      0x5000 -> "LP_DamageSkin"
      0x5001 -> "LP_OpenWebsite"

      0x15 -> "LP_LatestConnectedWorld"
      0x16 -> "LP_RecommendWorldMessage"

      _ -> "UNKNOWN"
    end
  end
end