using System;
using System.Collections.Generic;
using System.Globalization;
using System.Numerics;
using System.Text.Json;
using Dalamud.Bindings.ImGui;
using Dalamud.Interface.Utility.Raii;
using Dalamud.Plugin.Services;
using LLib.ImGui;
using Microsoft.Extensions.Logging;
using SmartNav.Data;
using SmartNav.Model.Navigation;

namespace Questionable.Windows.SmartNavComponents;

internal sealed class SubRegionMapPanel : IEditablePolygonSet
{
	internal sealed class EditableSubRegion
	{
		public string Id = string.Empty;

		public string Comment = string.Empty;

		public float MinYEdit;

		public float MaxYEdit;

		public bool HasMinY;

		public bool HasMaxY;

		public List<Vector2> Vertices = new List<Vector2>();
	}

	private static readonly uint[] SubRegionColors = new uint[8] { 1610612991u, 1610678016u, 1627332640u, 1610678271u, 1627324671u, 1627389696u, 1627357184u, 1619001599u };

	private readonly MapTextureService _mapService;

	private readonly MapPolygonEditor _editor;

	private readonly ZoneSubRegionService _zoneSubRegionService;

	private readonly IClientState _clientState;

	private readonly IObjectTable _objectTable;

	private uint _loadedTerritory;

	private readonly List<EditableSubRegion> _subRegions = new List<EditableSubRegion>();

	public int SelectedIndex
	{
		get
		{
			return _editor.SelectedIndex;
		}
		set
		{
			_editor.SelectedIndex = value;
		}
	}

	public bool IsDrawing => _editor.IsDrawing;

	public IReadOnlyList<EditableSubRegion> SubRegions => _subRegions;

	int IEditablePolygonSet.PolygonCount => _subRegions.Count;

	public SubRegionMapPanel(ITextureProvider textureProvider, IDataManager dataManager, ZoneSubRegionService zoneSubRegionService, IClientState clientState, IObjectTable objectTable, ILoggerFactory loggerFactory)
	{
		_mapService = new MapTextureService(textureProvider, dataManager, loggerFactory.CreateLogger<MapTextureService>());
		_editor = new MapPolygonEditor(_mapService);
		_zoneSubRegionService = zoneSubRegionService;
		_clientState = clientState;
		_objectTable = objectTable;
	}

	public void Draw(JsonSerializerOptions jsonOptions)
	{
		uint territoryType = _clientState.TerritoryType;
		EnsureLoaded(territoryType);
		_mapService.LoadForTerritory(territoryType);
		DrawToolbar(jsonOptions);
		Vector3? playerPosition = _objectTable.LocalPlayer?.Position;
		Vector2 contentRegionAvail = ImGui.GetContentRegionAvail();
		_editor.Draw(this, playerPosition, new Vector2(contentRegionAvail.X, 500f));
	}

	private void DrawToolbar(JsonSerializerOptions jsonOptions)
	{
		if (_editor.IsDrawing)
		{
			ImGui.TextColored(new Vector4(0.2f, 1f, 0.2f, 1f), "Drawing polygon... Click to add vertices. Close: click first vertex / Enter / double-click. Escape cancels.");
		}
		else
		{
			if (ImGui.Button("Draw Polygon"))
			{
				_editor.StartDrawing();
			}
			ImGui.SameLine();
			if (ImGui.Button("Reset View"))
			{
				_editor.ResetView();
			}
			if (_editor.SelectedIndex >= 0 && _editor.SelectedIndex < _subRegions.Count)
			{
				ImGui.SameLine();
				if (ImGui.Button("Delete Selected"))
				{
					_subRegions.RemoveAt(_editor.SelectedIndex);
					_editor.SelectedIndex = -1;
				}
			}
			ImGui.SameLine();
			if (ImGui.Button("Copy All JSON"))
			{
				TerritorySubRegions value = BuildTerritorySubRegions();
				ImGui.SetClipboardText(JsonSerializer.Serialize(new Dictionary<string, object> { [_clientState.TerritoryType.ToString(CultureInfo.InvariantCulture)] = value }, jsonOptions));
			}
		}
		if (_editor.SelectedIndex >= 0 && _editor.SelectedIndex < _subRegions.Count)
		{
			EditableSubRegion editableSubRegion = _subRegions[_editor.SelectedIndex];
			ImGui.SetNextItemWidth(120f);
			ImGui.InputText("ID##mapSr", ref editableSubRegion.Id, 64);
			ImGui.SameLine();
			ImGui.SetNextItemWidth(200f);
			ImGui.InputText("Comment##mapSr", ref editableSubRegion.Comment, 128);
			ImGui.Checkbox("MinY##mapSrCb", ref editableSubRegion.HasMinY);
			ImGui.SameLine();
			using (ImRaii.Disabled(!editableSubRegion.HasMinY))
			{
				ImGui.SetNextItemWidth(80f);
				ImGui.InputFloat("##minY", ref editableSubRegion.MinYEdit, 0f, 0f, "%.1f");
			}
			ImGui.SameLine();
			ImGui.Checkbox("MaxY##mapSrCb", ref editableSubRegion.HasMaxY);
			ImGui.SameLine();
			using (ImRaii.Disabled(!editableSubRegion.HasMaxY))
			{
				ImGui.SetNextItemWidth(80f);
				ImGui.InputFloat("##maxY", ref editableSubRegion.MaxYEdit, 0f, 0f, "%.1f");
			}
		}
	}

	private void EnsureLoaded(uint territory)
	{
		if (territory == _loadedTerritory)
		{
			return;
		}
		_loadedTerritory = territory;
		_subRegions.Clear();
		_editor.SelectedIndex = -1;
		if (!_zoneSubRegionService.HasSubRegions(territory))
		{
			return;
		}
		IReadOnlyList<SubRegionDefinition> subRegions = _zoneSubRegionService.GetSubRegions(territory);
		if (subRegions == null)
		{
			return;
		}
		foreach (SubRegionDefinition item in subRegions)
		{
			List<Vector2> list = new List<Vector2>(item.Vertices.Count);
			foreach (SubRegionVertex vertex in item.Vertices)
			{
				list.Add(new Vector2(vertex.X, vertex.Z));
			}
			_subRegions.Add(new EditableSubRegion
			{
				Id = item.Id,
				Comment = (item.Comment ?? string.Empty),
				MinYEdit = item.MinY.GetValueOrDefault(),
				MaxYEdit = item.MaxY.GetValueOrDefault(),
				HasMinY = item.MinY.HasValue,
				HasMaxY = item.MaxY.HasValue,
				Vertices = list
			});
		}
	}

	public TerritorySubRegions BuildTerritorySubRegions()
	{
		TerritorySubRegions territorySubRegions = new TerritorySubRegions();
		foreach (EditableSubRegion subRegion in _subRegions)
		{
			SubRegionDefinition subRegionDefinition = new SubRegionDefinition
			{
				Id = subRegion.Id,
				Comment = (string.IsNullOrEmpty(subRegion.Comment) ? null : subRegion.Comment),
				MinY = (subRegion.HasMinY ? new float?(subRegion.MinYEdit) : ((float?)null)),
				MaxY = (subRegion.HasMaxY ? new float?(subRegion.MaxYEdit) : ((float?)null))
			};
			foreach (Vector2 vertex in subRegion.Vertices)
			{
				subRegionDefinition.Vertices.Add(new SubRegionVertex
				{
					X = MathF.Round(vertex.X, 1),
					Z = MathF.Round(vertex.Y, 1)
				});
			}
			territorySubRegions.SubRegions.Add(subRegionDefinition);
		}
		return territorySubRegions;
	}

	public void ImportVertices(IReadOnlyList<SubRegionVertex> vertices, string id, string comment)
	{
		List<Vector2> list = new List<Vector2>(vertices.Count);
		foreach (SubRegionVertex vertex in vertices)
		{
			list.Add(new Vector2(vertex.X, vertex.Z));
		}
		_subRegions.Add(new EditableSubRegion
		{
			Id = id,
			Comment = comment,
			Vertices = list
		});
		_editor.SelectedIndex = _subRegions.Count - 1;
	}

	public List<SubRegionVertex> ExportSelectedVertices()
	{
		if (_editor.SelectedIndex < 0 || _editor.SelectedIndex >= _subRegions.Count)
		{
			return new List<SubRegionVertex>();
		}
		EditableSubRegion editableSubRegion = _subRegions[_editor.SelectedIndex];
		List<SubRegionVertex> list = new List<SubRegionVertex>(editableSubRegion.Vertices.Count);
		foreach (Vector2 vertex in editableSubRegion.Vertices)
		{
			list.Add(new SubRegionVertex
			{
				X = MathF.Round(vertex.X, 1),
				Z = MathF.Round(vertex.Y, 1)
			});
		}
		return list;
	}

	IList<Vector2> IEditablePolygonSet.GetVertices(int polygonIndex)
	{
		return _subRegions[polygonIndex].Vertices;
	}

	uint IEditablePolygonSet.GetColor(int polygonIndex)
	{
		return SubRegionColors[polygonIndex % SubRegionColors.Length];
	}

	string IEditablePolygonSet.GetLabel(int polygonIndex)
	{
		return _subRegions[polygonIndex].Id;
	}

	void IEditablePolygonSet.AddPolygon(IList<Vector2> vertices)
	{
		_subRegions.Add(new EditableSubRegion
		{
			Id = $"region_{_subRegions.Count + 1}",
			Vertices = new List<Vector2>(vertices)
		});
	}
}