using System;
using System.Collections.Generic;
using System.Runtime.CompilerServices;
using FFXIVClientStructs.FFXIV.Client.UI;
using FFXIVClientStructs.FFXIV.Component.GUI;
using KamiToolKit.Classes;
using KamiToolKit.Nodes;

namespace KamiToolKit;

public abstract unsafe partial class NodeBase {

    internal readonly List<NodeBase> ChildNodes = [];
    private NodeBase? parentNode;

    internal AtkUldManager* ParentUldManager { get; set; }
    internal AtkUnitBase* ParentAddon { get; private set; }

    [OverloadResolutionPriority(1)]
    public void AttachNode(NativeAddon? targetAddon, NodePosition targetPosition = NodePosition.AsLastChild)
        => PerformManagedAttach(targetAddon, targetPosition);

    public void AttachNode(AtkUnitBase* targetAddon, NodePosition targetPosition = NodePosition.AsLastChild)
        => PerformNativeAttach(targetAddon is not null ? targetAddon->RootNode : null, targetPosition);
    
    [OverloadResolutionPriority(1)]
    public void AttachNode(NodeBase? targetNode, NodePosition targetPosition = NodePosition.AsLastChild)
        => PerformManagedAttach(targetNode, targetPosition);

    public void AttachNode(AtkResNode* targetNode, NodePosition targetPosition = NodePosition.AsLastChild)
        => PerformNativeAttach(targetNode, targetPosition);
    
    public void AttachNode(AtkImageNode* targetNode, NodePosition targetPosition = NodePosition.AsLastChild)
        => PerformNativeAttach((AtkResNode*)targetNode, targetPosition);
    
    public void AttachNode(AtkTextNode* targetNode, NodePosition targetPosition = NodePosition.AsLastChild)
        => PerformNativeAttach((AtkResNode*)targetNode, targetPosition);
    
    public void AttachNode(AtkNineGridNode* targetNode, NodePosition targetPosition = NodePosition.AsLastChild)
        => PerformNativeAttach((AtkResNode*)targetNode, targetPosition);
    
    public void AttachNode(AtkCounterNode* targetNode, NodePosition targetPosition = NodePosition.AsLastChild)
        => PerformNativeAttach((AtkResNode*)targetNode, targetPosition);
    
    public void AttachNode(AtkCollisionNode* targetNode, NodePosition targetPosition = NodePosition.AsLastChild)
        => PerformNativeAttach((AtkResNode*)targetNode, targetPosition);
    
    public void AttachNode(AtkClippingMaskNode* targetNode, NodePosition targetPosition = NodePosition.AsLastChild)
        => PerformNativeAttach((AtkResNode*)targetNode, targetPosition);

    public void AttachNode(AtkComponentNode* targetNode, NodePosition targetPosition = NodePosition.AfterAllSiblings)
        => PerformNativeAttach((AtkResNode*)targetNode, targetPosition);

    private void PerformManagedAttach(NativeAddon? targetAddon, NodePosition targetPosition = NodePosition.AsLastChild) {
        if (MainThreadSafety.TryAssertMainThread()) return;
        if (targetAddon is null) return;

        // Check the Addon's node list to find out what NodeId we should be, and set that before attaching
        if (NodeId > NodeIdBase) {
            NodeId = targetAddon.InternalAddon->UldManager.GetMaxNodeId() + 1;
        }
        
        PerformNativeAttach(targetAddon.RootNode, targetPosition);

        parentNode = targetAddon.RootNode;
        parentNode.ChildNodes.Add(this);
    }

    private void PerformManagedAttach(NodeBase? targetNode, NodePosition targetPosition) {
        if (MainThreadSafety.TryAssertMainThread()) return;
        if (targetNode is null) return;

        PerformNativeAttach(targetNode, targetPosition);

        parentNode = targetNode;
        parentNode.ChildNodes.Add(this);
    }
    
    private void PerformNativeAttach(AtkResNode* targetNode, NodePosition targetPosition) {
        if (MainThreadSafety.TryAssertMainThread()) return;
        if (targetNode is null) return;

        if (targetNode->GetNodeType() is NodeType.Component) {
            
            // If target is a ComponentNode,
            // then we don't ever wanna be a child of the ComponentNode itself,
            // we will want to be a sibling of the root node.
            // Therefore, redirect the target position to be siblings.
            targetPosition = targetPosition switch {
                NodePosition.AsLastChild => NodePosition.AfterAllSiblings,
                NodePosition.AsFirstChild => NodePosition.BeforeAllSiblings,
                _ => targetPosition,
            };
            
            // If however, we are using BeforeTarget or AfterTarget,
            // then we do want to attach to the ComponentNode
            // else, attach to its root node.
            var componentNode = targetNode->GetAsAtkComponentNode();
            if (componentNode is not null) {
                targetNode = targetPosition switch {
                    NodePosition.AfterTarget => targetNode,
                    NodePosition.BeforeTarget => targetNode,
                    NodePosition.AfterAllSiblings => componentNode->Component->UldManager.RootNode,
                    NodePosition.BeforeAllSiblings => componentNode->Component->UldManager.RootNode,
                    _ => throw new ArgumentOutOfRangeException(nameof(targetPosition), targetPosition, null),
                };
                
                // We also need to check the components node list, to get a safely assigned nodeId
                if (NodeId > NodeIdBase) {
                    NodeId = componentNode->Component->UldManager.GetMaxNodeId() + 1;
                }
            }
        }

        NodeLinker.AttachNode(this, targetNode, targetPosition);
        UpdateParentAddon(targetNode);
        UpdateNative();
    }

    internal void ReattachNode(AtkResNode* newTarget) {
        if (newTarget is null) return;
        
        DetachNode();
        AttachNode(newTarget);
    }

    public void DetachNode() {
        if (MainThreadSafety.TryAssertMainThread()) return;
        if (ResNode is null) return;

        UnlinkFromNative();
        RemoveUldManagerObjectReferences();
        RemoveParentAddonReferences();
        RemoveParentNodeReferences();
    }

    private void UnlinkFromNative() {
        NodeLinker.DetachNode(ResNode);
        ResNode->ParentNode = null;
        ResNode->NextSiblingNode = null;
        ResNode->PrevSiblingNode = null;
    }
    
    private void RemoveUldManagerObjectReferences() {
        if (ParentUldManager is null) return;

        ParentUldManager->RemoveNodeFromObjectList(this);
        ParentUldManager = null;
    }
    
    private void RemoveParentAddonReferences() {
        if (ParentAddon is null) return;
        
        ParentAddon->UldManager.UpdateDrawNodeList();
        ParentAddon->UpdateCollisionNodeList(false);
            
        ParentAddon = null;
            
        foreach (var child in GetAllChildren(this)) {
            child.ParentAddon = null;
        }
    }
    
    private void RemoveParentNodeReferences() {
        if (parentNode is null) return;
        
        parentNode.ChildNodes.Remove(this);
        parentNode = null;
    }

    private void UpdateNative() {
        if (ResNode is null) return;

        MarkDirty();

        if (ParentUldManager is null) {
            ParentUldManager = GetUldManagerForNode(ResNode);
        }

        if (ParentUldManager is not null) {
            ParentUldManager->AddNodeToObjectList(this);
        }

        if (ParentAddon is not null) {
            if (ParentAddon->NameString is "NamePlate") {
                Log.Warning("Warning, attaching to AddonNamePlate is not supported. Use OverlayController instead.");
            }
            
            ParentAddon->UldManager.UpdateDrawNodeList();
            ParentAddon->UpdateCollisionNodeList(false);
        }
    }

    private void UpdateParentAddon(AtkResNode* node) {
        if (parentNode is not null && parentNode.ParentAddon is not null) {
            ParentAddon = parentNode.ParentAddon;
        }
        else if (ParentAddon is null) {
            var targetParentAddon = RaptureAtkUnitManager.Instance()->GetAddonByNode(node);
            if (targetParentAddon is not null) {
                ParentAddon = targetParentAddon;
            }
        }

        if (ParentAddon is not null) {
            foreach (var child in GetAllChildren(this)) {
                child.ParentAddon = ParentAddon;
            }
        }
    }

    private AtkUldManager* GetUldManagerForNode(AtkResNode* node) {
        if (node is null) return null;

        var targetNode = node;

        if (targetNode->GetNodeType() is NodeType.Component) {
            targetNode = targetNode->ParentNode;
        }

        // Try to get UldManager via the first parent that is a component
        while (targetNode is not null) {
            if (targetNode->GetNodeType() is NodeType.Component) {
                var componentNode = (AtkComponentNode*)targetNode;
                return &componentNode->Component->UldManager;
            }

            targetNode = targetNode->ParentNode;
        }

        // We failed to find a parent component, try to get a parent addon instead
        if (ParentAddon is not null) {
            return &ParentAddon->UldManager;
        }

        return null;
    }

    private static IEnumerable<NodeBase> GetAllChildren(NodeBase parent) {
        foreach (var child in parent.ChildNodes) {
            yield return child;
            foreach (var childNode in GetAllChildren(child)) {
                yield return childNode;
            }
        }
    }

    internal static IEnumerable<NodeBase> GetLocalChildren(NodeBase parent) {
        if (parent is ComponentNode) yield break;

        foreach (var child in parent.ChildNodes) {
            yield return child;

            if (child is ComponentNode) continue;
            foreach (var childNode in GetLocalChildren(child)) {
                yield return childNode;
            }
        }
    }
}