using System;
using System.Collections.Generic;
using System.Linq;
using System.Numerics;
using Microsoft.Extensions.Logging;
using Questionable.Controller.Steps;
using Questionable.Controller.Steps.Movement;
using SmartNav;

namespace Questionable.Navigation;

internal sealed class SmartNavRouteEnqueuer(NavRouter navRouter, PlayerNavStateBuilder playerNavStateBuilder, RouteInstructionBuilder instructionBuilder, SmartNavTaskMapper taskMapper, SmartNavReRouteService reRouteService, ILogger<SmartNavRouteEnqueuer> logger)
{
	public void Enqueue(TaskQueue taskQueue, uint territoryId, Vector3 position, float? fallbackStopDistance = null)
	{
		if (!TryEnqueueRouted(taskQueue, territoryId, position))
		{
			taskQueue.Enqueue(new MoveTask((ushort)territoryId, position, null, MountRequired: false, DismountRequired: false, fallbackStopDistance));
			reRouteService.SetDestination(territoryId, position);
		}
	}

	public bool TryEnqueueRouted(TaskQueue taskQueue, uint territoryId, Vector3 position)
	{
		PlayerNavState playerNavState = playerNavStateBuilder.Build();
		if (playerNavState == null)
		{
			return false;
		}
		RouteResult routeResult = navRouter.FindRoute(playerNavState, territoryId, position);
		if (routeResult.Segments.Count == 0)
		{
			return false;
		}
		logger.LogDebug("SmartNav routing with {Count} segments", routeResult.Segments.Count);
		foreach (ITask item in taskMapper.MapInstructions(instructionBuilder.Build(routeResult, territoryId)))
		{
			taskQueue.Enqueue(item);
		}
		reRouteService.SetDestination(territoryId, position);
		return true;
	}

	public bool TryEnqueueToTerritory(TaskQueue taskQueue, uint territoryId, Vector3 position)
	{
		PlayerNavState playerNavState = playerNavStateBuilder.Build();
		if (playerNavState == null)
		{
			return false;
		}
		RouteResult routeResult = navRouter.FindRoute(playerNavState, territoryId, position);
		if (routeResult.Segments.Count == 0)
		{
			return false;
		}
		List<NavInstruction> list = instructionBuilder.Build(routeResult, territoryId).TakeWhile((NavInstruction x) => !(x is NavInstruction.Move move) || !move.IsFinal).ToList();
		if (list.Count == 0)
		{
			return false;
		}
		logger.LogDebug("SmartNav routing to territory {TerritoryId} with {Count} segments; leaving final movement to the caller", territoryId, routeResult.Segments.Count);
		foreach (ITask item in taskMapper.MapInstructions(list))
		{
			taskQueue.Enqueue(item);
		}
		reRouteService.SetDestination(territoryId, position);
		return true;
	}

	public IReadOnlyList<ITask> BuildRoutedTasks(uint territoryId, Vector3 position)
	{
		reRouteService.SetDestination(territoryId, position);
		PlayerNavState playerNavState = playerNavStateBuilder.Build();
		if (playerNavState != null)
		{
			RouteResult routeResult = navRouter.FindRoute(playerNavState, territoryId, position);
			if (routeResult.Segments.Count > 0)
			{
				logger.LogDebug("SmartNav routing with {Count} segments", routeResult.Segments.Count);
				List<ITask> list = new List<ITask>();
				list.AddRange(taskMapper.MapInstructions(instructionBuilder.Build(routeResult, territoryId)));
				return new global::_003C_003Ez__ReadOnlyList<ITask>(list);
			}
		}
		return new global::_003C_003Ez__ReadOnlySingleElementList<ITask>(new MoveTask((ushort)territoryId, position));
	}

	public bool RouteStartsWithTeleport(uint territoryId, Vector3 position)
	{
		PlayerNavState playerNavState = playerNavStateBuilder.Build();
		if (playerNavState == null)
		{
			return false;
		}
		RouteResult routeResult = navRouter.FindRoute(playerNavState, territoryId, position);
		if (routeResult.Segments.Count == 0)
		{
			return false;
		}
		foreach (NavInstruction item in instructionBuilder.Build(routeResult, territoryId))
		{
			bool? flag = StartsWithTeleport(item);
			if (flag.HasValue)
			{
				return flag == true;
			}
		}
		return false;
		static bool? StartsWithTeleport(NavInstruction instruction)
		{
			if (instruction is NavInstruction.Teleport)
			{
				return true;
			}
			if (instruction is NavInstruction.UseTeleportTicket)
			{
				return true;
			}
			if (instruction is NavInstruction.Move)
			{
				return false;
			}
			if (instruction is NavInstruction.AethernetHop)
			{
				return false;
			}
			if (instruction is NavInstruction.InteractWarp)
			{
				return false;
			}
			if (instruction is NavInstruction.SubRegionTransport)
			{
				return false;
			}
			if (instruction is NavInstruction.Land)
			{
				return null;
			}
			if (instruction is NavInstruction.Unmount)
			{
				return null;
			}
			if (instruction is NavInstruction.WaitForTerritory)
			{
				return null;
			}
			if (!(instruction is NavInstruction.WaitForNavmesh))
			{
				throw new InvalidOperationException($"Unclassified NavInstruction: {instruction}");
			}
			return null;
		}
	}

	public void ClearDestination()
	{
		reRouteService.ClearDestination();
	}

	public void SetDestination(uint territoryId, Vector3 position)
	{
		reRouteService.SetDestination(territoryId, position);
	}
}