using System.Collections.Generic;
using Game.Features.Interactions.Contracts;
using Game.Features.Items.Contracts;
using Game.Features.Players.Contracts;
using Game.Godot;
using Game.Godot.Extensions;
using Game.Godot.Mappings;
using Godot;

namespace Game.Features.Interactions.Godot;

public partial class PlayerInteractionController : Node, IItemSpawnPoint
{
    [Export] public Camera3D Camera;
    [Export] public CharacterBody3D Body;
    [Export] public InteractionRaycaster InteractionRaycaster;
    [Export] public RayCast3D DropRaycaster;
    [Export] public InteractionPromptController PromptController;
    [Export] public Node3D LeftHandAnchor;
    [Export] public Node3D RightHandAnchor;

    private IItemInteractionService _items;
    private IInteractionService _interactions;
    private PlayerId _playerId;
    private readonly HashSet<Hand> _dropActions = [];
    private readonly Dictionary<Hand, InteractionTargetId?> _activeUseTargets = [];

    public override void _Ready()
    {
        this.AssertRequiredExports();
    }

    public void Initialize(
        PlayerId playerId,
        IItemInteractionService items,
        IInteractionService interactions
    )
    {
        _playerId = playerId;
        _items = items;
        _interactions = interactions;
    }

    public override void _Process(double delta)
    {
        if (_items is null || _interactions is null || GamePause.IsPaused || !MouseCapture.IsCaptured)
        {
            PromptController.Clear();
            return;
        }

        UpdatePrompt();
    }

    public override void _UnhandledInput(InputEvent @event)
    {
        if (_items is null || _interactions is null || GamePause.IsPaused || !MouseCapture.IsCaptured)
        {
            return;
        }

        if (@event.IsActionPressed(InputAction.UseLeftHand.ActionName()))
        {
            ProcessHandActionStarted(Hand.Left);
            GetViewport().SetInputAsHandled();
            return;
        }

        if (@event.IsActionReleased(InputAction.UseLeftHand.ActionName()))
        {
            ProcessHandActionCompleted(Hand.Left);
            GetViewport().SetInputAsHandled();
            return;
        }

        if (@event.IsActionPressed(InputAction.UseRightHand.ActionName()))
        {
            ProcessHandActionStarted(Hand.Right);
            GetViewport().SetInputAsHandled();
            return;
        }

        if (@event.IsActionReleased(InputAction.UseRightHand.ActionName()))
        {
            ProcessHandActionCompleted(Hand.Right);
            GetViewport().SetInputAsHandled();
            return;
        }

        if (@event.IsActionPressed(InputAction.Interact.ActionName()))
        {
            IInteractionTarget target = InteractionRaycaster.GetTarget<IInteractionTarget>();
            if (target?.CanInteract == true)
            {
                _interactions.TryInteract(new InteractionRequest(_playerId, target.Id));
            }

            GetViewport().SetInputAsHandled();
        }
    }

    public Vector3 GetItemSpawnPosition() => CalculateDropPosition();

    private void ProcessHandActionStarted(Hand hand)
    {
        if (Input.IsActionPressed(InputAction.DropModifier.ActionName()))
        {
            if (_activeUseTargets.Remove(hand, out InteractionTargetId? activeTargetId))
            {
                _items.TryUse(new ItemUseRequest(
                    _playerId,
                    hand,
                    ItemActionPhase.Cancelled,
                    activeTargetId
                ));
            }

            _items.TryDrop(hand, CalculateDropPosition());
            _dropActions.Add(hand);
            return;
        }

        if (!_items.IsHandFree(hand))
        {
            ItemUseRequest request = CreateUseRequest(hand, ItemActionPhase.Started);
            ItemActionResult result = _items.TryUse(request);
            if (result.Success)
            {
                _activeUseTargets[hand] = request.TargetId;
            }

            return;
        }

        IPickupTarget target = InteractionRaycaster.GetTarget<IPickupTarget>();
        if (target is not null)
        {
            _items.TryPickup(target.ItemInfo.Id, hand);
        }
    }

    private void ProcessHandActionCompleted(Hand hand)
    {
        if (_dropActions.Remove(hand))
        {
            return;
        }

        if (_activeUseTargets.Remove(hand, out InteractionTargetId? targetId))
        {
            _items.TryUse(new ItemUseRequest(_playerId, hand, ItemActionPhase.Completed, targetId));
        }
    }

    private ItemUseRequest CreateUseRequest(Hand hand, ItemActionPhase phase)
    {
        InteractionTargetId? targetId = InteractionRaycaster.GetTarget<IInteractionTarget>()?.Id;
        return new ItemUseRequest(_playerId, hand, phase, targetId);
    }

    private Vector3 CalculateDropPosition()
    {
        DropRaycaster.ForceRaycastUpdate();

        Vector3 origin = Camera.GlobalPosition;
        Vector3 direction = -Camera.GlobalBasis.Z.Normalized();
        float distance = DropRaycaster.TargetPosition.Length();

        if (DropRaycaster.IsColliding())
        {
            distance = Mathf.Max(0.25f, origin.DistanceTo(DropRaycaster.GetCollisionPoint()) - 0.2f);
        }

        return origin + direction * distance;
    }

    private void UpdatePrompt()
    {
        IPickupTarget pickupTarget = InteractionRaycaster.GetTarget<IPickupTarget>();
        if (pickupTarget is not null)
        {
            ShowPickupPrompt(pickupTarget.ItemInfo);
            return;
        }

        IInteractionTarget interactionTarget = InteractionRaycaster.GetTarget<IInteractionTarget>();
        if (interactionTarget?.CanInteract == true)
        {
            PromptController.ShowPrompt($"[E] {interactionTarget.Prompt.Text}");
            return;
        }

        PromptController.Clear();
    }

    private void ShowPickupPrompt(ItemInfo itemInfo)
    {
        if (itemInfo.HandRequirement == HandRequirement.Both)
        {
            bool bothHandsFree = _items.IsHandFree(Hand.Left) && _items.IsHandFree(Hand.Right);
            PromptController.ShowPrompt(bothHandsFree
                ? $"[LPM lub PPM] Podnieś {itemInfo.DisplayName} — obie ręce"
                : "Potrzebujesz obu wolnych rąk");
            return;
        }

        List<string> actions = [];

        if (_items.IsHandFree(Hand.Left))
        {
            actions.Add($"[LPM] Podnieś {itemInfo.DisplayName} — lewa ręka");
        }

        if (_items.IsHandFree(Hand.Right))
        {
            actions.Add($"[PPM] Podnieś {itemInfo.DisplayName} — prawa ręka");
        }

        PromptController.ShowPrompt(actions.Count > 0
            ? string.Join("\n", actions)
            : "Brak wolnej ręki");
    }
}