using System;
using Sandbox.UI;

namespace Goo.Internal;

internal sealed class StatefulTextEntry : Sandbox.UI.TextEntry, IStatefulEventHost
{
    internal Action<string>? _onChange;
    internal Action<string>? _onSubmit;
    internal Action? _onFocus;
    internal Action<string>? _onBlur;
    internal Action? _onCancel;

    internal Action<MousePanelEvent>? _onClick;
    internal Action<MousePanelEvent>? _onMouseEnter;
    internal Action<MousePanelEvent>? _onMouseLeave;
    internal Action<MousePanelEvent>? _onMouseDown;
    internal Action<MousePanelEvent>? _onMouseUp;
    internal Action<MousePanelEvent>? _onMouseMove;
    internal bool _userSetPointerEvents;
    internal Action? _requestRebuild;
    public Action? RequestRebuild { set => _requestRebuild = value; }

    public StatefulTextEntry()
    {
        // Wire the engine's OnTextEdited through _onChange for per-keystroke notifications.
        OnTextEdited = newValue => { _onChange?.Invoke(newValue); if (_onChange != null) _requestRebuild?.Invoke(); };
    }

    // Engine fires "onsubmit" itself on Enter (no Submit method); hook OnEvent to react.
    protected override void OnEvent(PanelEvent e)
    {
        base.OnEvent(e);
        if (e.Name == "onsubmit") { _onSubmit?.Invoke(Text ?? string.Empty); if (_onSubmit != null) _requestRebuild?.Invoke(); }
        // Escape fires "oncancel" via the engine's Cancel(); value-less, same path as onsubmit.
        if (e.Name == "oncancel") { _onCancel?.Invoke(); if (_onCancel != null) _requestRebuild?.Invoke(); }
    }

    // Call base first so the engine's focus/blur work runs before we observe the committed Text.
    protected override void OnFocus(PanelEvent e)
    {
        base.OnFocus(e);
        if (_onFocus != null) { _onFocus.Invoke(); _requestRebuild?.Invoke(); }
    }

    protected override void OnBlur(PanelEvent e)
    {
        base.OnBlur(e);
        if (_onBlur != null) { _onBlur.Invoke(Text ?? string.Empty); _requestRebuild?.Invoke(); }
    }

    public void ApplyEvents(in BlobEvents events)
    {
        _onClick      = events.OnClick;
        _onMouseEnter = events.OnMouseEnter;
        _onMouseLeave = events.OnMouseLeave;
        _onMouseDown  = events.OnMouseDown;
        _onMouseUp    = events.OnMouseUp;
        _onMouseMove  = events.OnMouseMove;
    }

    public bool HasEventHandlers =>
        _onClick != null || _onMouseEnter != null || _onMouseLeave != null ||
        _onMouseDown != null || _onMouseUp != null || _onMouseMove != null ||
        _onChange != null || _onSubmit != null ||
        _onFocus != null || _onBlur != null || _onCancel != null;

    public bool UserSetPointerEvents
    {
        get => _userSetPointerEvents;
        set => _userSetPointerEvents = value;
    }

    protected override void OnClick(MousePanelEvent e)       { base.OnClick(e);       EventDispatch.Fire(_onClick, e, _requestRebuild); }
    protected override void OnRightClick(MousePanelEvent e)  { base.OnRightClick(e);  EventDispatch.Fire(_onClick, e, _requestRebuild); }
    protected override void OnMiddleClick(MousePanelEvent e) { base.OnMiddleClick(e); EventDispatch.Fire(_onClick, e, _requestRebuild); }
    protected override void OnMouseOver(MousePanelEvent e)   { base.OnMouseOver(e);   EventDispatch.Fire(_onMouseEnter, e, _requestRebuild); }
    protected override void OnMouseOut(MousePanelEvent e)    { base.OnMouseOut(e);    EventDispatch.Fire(_onMouseLeave, e, _requestRebuild); }
    protected override void OnMouseDown(MousePanelEvent e)   { base.OnMouseDown(e);   EventDispatch.Fire(_onMouseDown, e, _requestRebuild); }
    protected override void OnMouseUp(MousePanelEvent e)     { base.OnMouseUp(e);     EventDispatch.Fire(_onMouseUp, e, _requestRebuild); }
    protected override void OnMouseMove(MousePanelEvent e)   { base.OnMouseMove(e);   EventDispatch.Fire(_onMouseMove, e, _requestRebuild); }
}