using System;
using System.Collections.Generic;
using System.Linq;
using System.Numerics;
using Dalamud.Bindings.ImGui;
using Dalamud.Interface.Utility.Raii;
using Questionable.Controller;
using Questionable.Model;
using Questionable.Model.Questing;

namespace Questionable.Windows.Utils;

internal sealed class QuestSelector(QuestRegistry questRegistry)
{
	private string _searchString = string.Empty;

	private bool _comboJustOpened;

	public Predicate<Quest>? SuggestionPredicate { private get; set; }

	public Predicate<Quest>? DefaultPredicate { private get; set; }

	public Action<Quest>? QuestSelected { private get; set; }

	public void DrawSelection()
	{
		if (QuestSelected == null)
		{
			throw new InvalidOperationException("QuestSelected action must be set before drawing the quest selector.");
		}
		ImGui.SetNextItemWidth(ImGui.GetContentRegionAvail().X);
		if (ImGui.BeginCombo("##QuestSelection", "Add Quest...", ImGuiComboFlags.HeightLarge))
		{
			if (!_comboJustOpened)
			{
				ImGui.SetKeyboardFocusHere();
				_comboJustOpened = true;
			}
			ImGui.SetNextItemWidth(-1f);
			bool flag = ImGui.InputTextWithHint("##QuestSearch", "Search quests...", ref _searchString, 256, ImGuiInputTextFlags.AutoSelectAll | ImGuiInputTextFlags.EnterReturnsTrue);
			ImGui.Separator();
			IEnumerable<Quest> enumerable;
			if (!string.IsNullOrEmpty(_searchString))
			{
				enumerable = Enumerable.Where(predicate: (!ElementId.TryFromString(_searchString, out ElementId elementId)) ? new Func<Quest, bool>(SearchPredicate) : ((Func<Quest, bool>)((Quest x) => SearchPredicate(x) || x.Id == elementId)), source: questRegistry.AllQuests.Where(delegate(Quest x)
				{
					ElementId id = x.Id;
					return !(id is SatisfactionSupplyNpcId) && !(id is AlliedSocietyDailyId);
				}));
			}
			else
			{
				enumerable = questRegistry.AllQuests.Where((Quest x) => DefaultPredicate?.Invoke(x) ?? true);
			}
			using (ImRaii.IEndObject endObject = ImRaii.Child("##QuestScrollArea", new Vector2(0f, 300f), border: false))
			{
				if (endObject)
				{
					foreach (Quest item in enumerable)
					{
						if ((SuggestionPredicate == null || SuggestionPredicate(item)) && (ImGui.Selectable(item.Info.Name) || flag))
						{
							QuestSelected(item);
							_searchString = string.Empty;
							if (flag)
							{
								ImGui.CloseCurrentPopup();
								flag = false;
							}
						}
					}
				}
			}
			ImGui.EndCombo();
		}
		else
		{
			_comboJustOpened = false;
		}
		ImGui.Spacing();
		bool SearchPredicate(Quest x)
		{
			return x.Info.Name.Contains(_searchString, StringComparison.CurrentCultureIgnoreCase);
		}
	}
}