using System.Globalization;
using System.Runtime.InteropServices;
using Dalamud.Game.ClientState.Conditions;
using Dalamud.Game.Text.SeStringHandling;
using Dalamud.Hooking;
using Dalamud.Memory;
using Dalamud.Utility;
using Dalamud.Utility.Signatures;
using FFXIVClientStructs.FFXIV.Client.Enums;
using FFXIVClientStructs.FFXIV.Client.Game.UI;
using FFXIVClientStructs.FFXIV.Client.UI;
using FFXIVClientStructs.FFXIV.Client.UI.Agent;
using FFXIVClientStructs.FFXIV.Client.UI.Info;
using FFXIVClientStructs.FFXIV.Component.GUI;
using Lumina.Excel;
using Lumina.Excel.Sheets;
using ValueType = FFXIVClientStructs.FFXIV.Component.GUI.AtkValueType;

namespace HellionChat.GameFunctions;

internal unsafe class GameFunctions : IDisposable
{
    internal const string NewGamePlusAddonName = "QuestRedo";

    #region Hooks
    [Signature(
        "E8 ?? ?? ?? ?? 48 85 C0 0F 84 ?? ?? ?? ?? 48 8B D0 49 8D 4F",
        DetourName = nameof(ResolveTextCommandPlaceholderDetour)
    )]
    private Hook<ResolveTextCommandPlaceholderDelegate>? ResolveTextCommandPlaceholderHook = null!;
    private delegate nint ResolveTextCommandPlaceholderDelegate(
        nint a1,
        byte* placeholderText,
        byte a3,
        byte a4
    );
    #endregion

    private Plugin Plugin { get; }
    internal KeybindManager KeybindManager { get; }
    internal Chat Chat { get; }

    internal GameFunctions(Plugin plugin)
    {
        Plugin = plugin;
        KeybindManager = new KeybindManager(plugin);
        Chat = new Chat(Plugin);

        Plugin.GameInteropProvider.InitializeFromAttributes(this);
        ResolveTextCommandPlaceholderHook?.Enable();
    }

    public void Dispose()
    {
        Chat.Dispose();
        KeybindManager.Dispose();
        ResolveTextCommandPlaceholderHook?.Dispose();
        Marshal.FreeHGlobal(PlaceholderNamePtr);
    }

    internal void SendFriendRequest(string name, ushort world) =>
        ListCommand(name, world, "friendlist");

    internal void AddToBlacklist(string name, ushort world) => ListCommand(name, world, "blist");

    internal void AddToMuteList(ulong accountId, ulong contentId, string name, short worldId) =>
        AgentMutelist.Instance()->Add(accountId, contentId, name, worldId);

    internal void AddToTermsList(SeString content) =>
        AgentTermFilter.Instance()->OpenNewFilterWindow(content.EncodeWithNullTerminator());

    private void ListCommand(string name, ushort world, string commandName)
    {
        var worldRow = Sheets.WorldSheet.GetRow(world);
        ReplacementName = $"{name}@{worldRow.Name.ToString()}";
        ChatBox.SendMessage($"/{commandName} add {Placeholder}");
    }

    private static T* GetAddon<T>(string name)
        where T : unmanaged
    {
        var addon = RaptureAtkModule.Instance()->RaptureAtkUnitManager.GetAddonByName(name);
        return addon != null && addon->IsReady ? (T*)addon : null;
    }

    internal static void SetAddonInteractable(string name, bool interactable)
    {
        var addon = GetAddon<AtkUnitBase>(name);
        if (addon == null)
            return;
        addon->IsVisible = interactable;
    }

    internal static void SetChatInteractable(bool interactable)
    {
        for (var i = 0; i < 4; i++)
            SetAddonInteractable($"ChatLogPanel_{i}", interactable);
        SetAddonInteractable("ChatLog", interactable);
    }

    internal static bool IsAddonInteractable(string name)
    {
        var addon = GetAddon<AtkUnitBase>(name);
        return addon != null && addon->IsVisible;
    }

    internal static void OpenItemTooltip(uint id, ItemKind itemKind)
    {
        var atkStage = AtkStage.Instance();
        var agent = AgentItemDetail.Instance();
        var addon = GetAddon<AtkUnitBase>("ItemDetail");

        if (agent == null || addon == null)
            return;

        agent->DetailKind = itemKind == ItemKind.EventItem ? DetailKind.KeyItem : DetailKind.Item;
        agent->TypeOrId = id;
        agent->Index = 0;
        agent->Flag1 &= 0xEF;
        agent->ItemId = id;

        // TODO: Revert when CS offset lands in a release build.
        *(byte*)((nint)agent + 0x21A) = 1;
        *(byte*)((nint)agent + 0x21E) = 0;

        agent->AddonId = addon->Id;
        atkStage->TooltipManager.TooltipType |= 2;
        addon->Show(false, 15);
    }

    internal static void CloseItemTooltip()
    {
        // Hide addon first to suppress the "addon close" sound.
        var addon = GetAddon<AtkUnitBase>("ItemDetail");
        if (addon != null)
            addon->Hide(true, false, 0);

        var agent = AgentItemDetail.Instance();
        if (agent != null)
        {
            var eventData = stackalloc AtkValue[1];
            var atkValues = stackalloc AtkValue[1];
            atkValues->Type = ValueType.Int;
            atkValues->Int = -1;
            agent->ReceiveEvent(eventData, atkValues, 1, 1);
        }
    }

    internal static void OpenPartyFinder()
    {
        // 6.05: 84433A (FF 97 ?? ?? ?? ?? 41 B4 01)
        var lfg = AgentLookingForGroup.Instance();
        if (lfg->IsAgentActive())
        {
            var addonId = lfg->GetAddonId();
            var atkModule = RaptureAtkModule.Instance();
            var atkModuleVtbl = (void**)atkModule->AtkModule.VirtualTable;
            var vf27 = (delegate* unmanaged<RaptureAtkModule*, ulong, ulong, byte>)
                atkModuleVtbl[27];
            vf27(atkModule, addonId, 1);
        }
        else
        {
            // 6.05: 8443DD
            if (*(uint*)((nint)lfg + 0x2C20) > 0)
                lfg->Hide();
            else
                lfg->Show();
        }
    }

    internal static bool IsMentor() => PlayerState.Instance()->IsMentor();

    internal static InfoProxyCommonList.CharacterData[] GetFriends() =>
        InfoProxyFriendList.Instance()->CharDataSpan.ToArray();

    internal static void OpenQuestLog(RowRef<Quest> quest)
    {
        var splits = quest.Value.Id.ToString().Split("_");
        if (splits.Length != 2)
        {
            Plugin.ChatGui.Print("QuestId is wrongly formatted");
            return;
        }

        if (
            !uint.TryParse(
                splits[1],
                NumberStyles.Any,
                CultureInfo.InvariantCulture,
                out var questId
            )
        )
        {
            Plugin.ChatGui.Print("Unable to parse quest id");
            return;
        }

        AgentQuestJournal.Instance()->OpenForQuest(questId, 1);
    }

    internal static void OpenPartyFinder(uint id) =>
        AgentLookingForGroup.Instance()->OpenListing(id);

    internal static void OpenAchievement(uint id) => AgentAchievement.Instance()->OpenById(id);

    internal static bool IsInInstance() => Plugin.Condition[ConditionFlag.BoundByDuty56];

    internal static bool TryOpenAdventurerPlate(ulong playerId)
    {
        try
        {
            AgentCharaCard.Instance()->OpenCharaCard(playerId);
            return true;
        }
        catch (Exception e)
        {
            Plugin.Log.Warning(e, "Unable to open adventurer plate");
            return false;
        }
    }

    internal static void ClickNoviceNetworkButton()
    {
        var agent = AgentChatLog.Instance();
        var value = new AtkValue { Type = ValueType.Int, Int = 3 }; // case 3
        var result = 0;
        var vf0 = *(delegate* unmanaged<AgentChatLog*, int*, AtkValue*, ulong, ulong, int*>*)
            agent->VirtualTable;
        vf0(agent, &result, &value, 0, 0);
    }

    private const int PlaceholderBufferSize = 128;
    private readonly nint PlaceholderNamePtr = Marshal.AllocHGlobal(PlaceholderBufferSize);
    private readonly string Placeholder = $"<{Guid.NewGuid():N}>";
    private string? ReplacementName;

    private nint ResolveTextCommandPlaceholderDetour(
        nint a1,
        byte* placeholderText,
        byte a3,
        byte a4
    )
    {
        // Hook field is nullable due to the Signature attribute, but will never
        // be null during normal execution; guard covers the teardown race only.
        if (ResolveTextCommandPlaceholderHook is null)
            return nint.Zero;

        var placeholder = MemoryHelper.ReadStringNullTerminated((nint)placeholderText);
        if (ReplacementName == null || placeholder != Placeholder)
            return ResolveTextCommandPlaceholderHook.Original(a1, placeholderText, a3, a4);

        // Guard against a malformed ReplacementName overflowing the 128-byte buffer.
        var byteCount = System.Text.Encoding.UTF8.GetByteCount(ReplacementName);
        if (byteCount >= PlaceholderBufferSize)
        {
            Plugin.Log.Warning(
                $"Replacement name too long for placeholder buffer ({byteCount} bytes >= {PlaceholderBufferSize}); falling back to original."
            );
            ReplacementName = null;
            return ResolveTextCommandPlaceholderHook.Original(a1, placeholderText, a3, a4);
        }

        MemoryHelper.WriteString(PlaceholderNamePtr, ReplacementName);
        ReplacementName = null;
        return PlaceholderNamePtr;
    }
}