using FFXIVClientStructs.FFXIV.Client.Game.Character;
using System.Runtime.InteropServices;
using MareSynchronos.Utils;
using Penumbra.String;
using MareSynchronos.API.Data.Enum;

namespace MareSynchronos.Models;

public class PlayerRelatedObject
{
    private readonly Func<IntPtr> getAddress;

    public unsafe Character* Character => (Character*)Address;

    private string _name;

    public ObjectKind ObjectKind { get; }
    public IntPtr Address { get; set; }
    public IntPtr DrawObjectAddress { get; set; }

    public IntPtr CurrentAddress
    {
        get
        {
            try
            {
                return getAddress.Invoke();
            }
            catch
            { return IntPtr.Zero; }
        }
    }

    public PlayerRelatedObject(ObjectKind objectKind, IntPtr address, IntPtr drawObjectAddress, Func<IntPtr> getAddress)
    {
        ObjectKind = objectKind;
        Address = address;
        DrawObjectAddress = drawObjectAddress;
        this.getAddress = getAddress;
        _name = string.Empty;
    }

    public byte[] EquipSlotData { get; set; } = new byte[40];
    public byte[] CustomizeData { get; set; } = new byte[26];
    public byte? HatState { get; set; }
    public byte? VisorWeaponState { get; set; }

    public bool HasTransientsUpdate { get; set; } = false;
    public bool HasUnprocessedUpdate { get; set; } = false;
    public bool DoNotSendUpdate { get; set; } = false;
    public bool IsProcessing { get; set; } = false;

    public unsafe void CheckAndUpdateObject()
    {
        var curPtr = CurrentAddress;
        if (curPtr != IntPtr.Zero)
        {
            var chara = (Character*)curPtr;
            bool addr = Address == IntPtr.Zero || Address != curPtr;
            bool equip = CompareAndUpdateByteData(chara->EquipSlotData, chara->CustomizeData);
            bool drawObj = (IntPtr)chara->GameObject.DrawObject != DrawObjectAddress;
            var name = new ByteString(chara->GameObject.Name).ToString();
            bool nameChange = (!string.Equals(name, _name, StringComparison.Ordinal));
            if (addr || equip || drawObj || nameChange)
            {
                _name = name;
                Logger.Verbose($"{ObjectKind} changed: {_name}, now: {curPtr:X}, {(IntPtr)chara->GameObject.DrawObject:X}");

                Address = curPtr;
                DrawObjectAddress = (IntPtr)chara->GameObject.DrawObject;
                HasUnprocessedUpdate = true;
            }
        }
        else if (Address != IntPtr.Zero || DrawObjectAddress != IntPtr.Zero)
        {
            Address = IntPtr.Zero;
            DrawObjectAddress = IntPtr.Zero;
            Logger.Verbose(ObjectKind + " Changed: " + _name + ", now: " + Address + ", " + DrawObjectAddress);
        }
    }

    private unsafe bool CompareAndUpdateByteData(byte* equipSlotData, byte* customizeData)
    {
        bool hasChanges = false;
        DoNotSendUpdate = false;
        for (int i = 0; i < EquipSlotData.Length; i++)
        {
            var data = Marshal.ReadByte((IntPtr)equipSlotData, i);
            if (EquipSlotData[i] != data)
            {
                EquipSlotData[i] = data;
                hasChanges = true;
            }
        }

        for (int i = 0; i < CustomizeData.Length; i++)
        {
            var data = Marshal.ReadByte((IntPtr)customizeData, i);
            if (CustomizeData[i] != data)
            {
                CustomizeData[i] = data;
                hasChanges = true;
            }
        }

        var newHatState = Marshal.ReadByte((IntPtr)customizeData + 30, 0);
        var newWeaponOrVisorState = Marshal.ReadByte((IntPtr)customizeData + 31, 0);
        if (newHatState != HatState)
        {
            if (HatState != null && !hasChanges && !HasUnprocessedUpdate)
            {
                Logger.Debug("Not Sending Update, only Hat changed");
                DoNotSendUpdate = true;
            }
            HatState = newHatState;
            hasChanges = true;
        }

        newWeaponOrVisorState &= 0b1101; // ignore drawing weapon

        if (newWeaponOrVisorState != VisorWeaponState)
        {
            if (VisorWeaponState != null && !hasChanges && !HasUnprocessedUpdate)
            {
                Logger.Debug("Not Sending Update, only Visor/Weapon changed");
                DoNotSendUpdate = true;
            }
            VisorWeaponState = newWeaponOrVisorState;
            hasChanges = true;
        }

        return hasChanges;
    }
}