using System;
using System.Collections.Generic;
using System.Linq;
using Dalamud.Bindings.ImGui;
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;

	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))
		{
			ImGui.SetNextItemWidth(ImGui.GetContentRegionAvail().X);
			bool flag = ImGui.InputTextWithHint("", "Filter...", ref _searchString, 256, ImGuiInputTextFlags.AutoSelectAll | ImGuiInputTextFlags.EnterReturnsTrue);
			IEnumerable<Quest> enumerable;
			if (!string.IsNullOrEmpty(_searchString))
			{
				enumerable = Enumerable.Where(predicate: (!ElementId.TryFromString(_searchString, out ElementId elementId)) ? new Func<Quest, bool>(DefaultPredicate) : ((Func<Quest, bool>)((Quest x) => DefaultPredicate(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) => this.DefaultPredicate?.Invoke(x) ?? true);
			}
			foreach (Quest item in enumerable)
			{
				if ((SuggestionPredicate == null || SuggestionPredicate(item)) && (ImGui.Selectable(item.Info.Name) || flag))
				{
					QuestSelected(item);
					if (flag)
					{
						ImGui.CloseCurrentPopup();
						flag = false;
					}
				}
			}
			ImGui.EndCombo();
		}
		ImGui.Spacing();
		bool DefaultPredicate(Quest x)
		{
			return x.Info.Name.Contains(_searchString, StringComparison.CurrentCultureIgnoreCase);
		}
	}
}