using Godot;
using Newlon.Components.Plants;
using Newlon.Components.Level;
using Newlon.Components.Zombies;

namespace Newlon.Components.GUI;

public partial class ShovelButton : TextureButton
{
    const float CONE_HEALTH = 295.0f;
    [Export] private PackedScene particles;
    private Entity hoveredEntity;
    private bool Selected => hoveredEntity != null;
    [Export]
    private RayCast2D raycast;
    [Export]
    private Timer timer;
    private void OnFocusExited()
    {
        ButtonPressed = false;
    }
    public override void _Ready()
    {
        raycast.Reparent(PoolContainer.Instance);
        FocusExited += OnFocusExited;
        timer.Timeout += OnTimerTimeout;
    }

    public override void _Toggled(bool toggledOn)
    {
        Cursor.Instance.shovel = toggledOn;
    }

    public override void _Input(InputEvent @event)
    {

        if (@event.IsActionPressed("primary_action") && ButtonPressed)
        {
            if (hoveredEntity != null)
            {
                if (hoveredEntity is RuntimePlantData hoveredPlant)
                {
                    hoveredPlant.Kill();
                    PoolContainer.Instance.SpawnParticles(particles, hoveredPlant.GlobalPosition + Vector2.Down * FieldParams.TileHeight / 2.0f);
                }
                else
                {
                    hoveredEntity.TakeDamage(CONE_HEALTH, null);
                    timer.Start();
                    Disabled = true;
                }
            }
            GetViewport().SetInputAsHandled();
            hoveredEntity?.GetNode<FlashShaderController>("FlashController").Deselect();
            hoveredEntity = null;
            ButtonPressed = false;
        }
        if (@event.IsActionPressed("cancel_plant") && ButtonPressed)
        {
            hoveredEntity?.GetNode<FlashShaderController>("FlashController").Deselect();
            hoveredEntity = null;
            ButtonPressed = false;
        }
    }
    public override void _Process(double delta)
    {
        UpdateTimer();

        if (ButtonPressed)
        {
            var gridEntity = GetTile(Cursor.GetCursorPosition());
            if (TrySetGridEntity(gridEntity)) return;
            if (TrySetDynEntity()) return;

            else
            {
                if (Selected)
                {
                    hoveredEntity.GetNode<FlashShaderController>("FlashController").Deselect();
                    hoveredEntity = null;
                    return;
                }
            }
        }
        else
        {
            if (Selected)
            {
                hoveredEntity.GetNode<FlashShaderController>("FlashController").Deselect();
                hoveredEntity = null;
            }
        }
    }
    private Entity GetTile(Vector2 position)
    {
        var checkedPosition = (position / FieldParams.Tile).Ceil() * FieldParams.Tile - new Vector2(20, 14);
        for (int i = FieldParams.LayersCount - 1; i >= 0; i--)
        {
            if (PoolContainer.Instance.EntityField[i].TryGetValue(checkedPosition, out var entity) && entity is RuntimePlantData plantData)
            {
                return plantData;
            }
        }
        return null;
    }
    private bool TrySetGridEntity(Entity chosenEntity)
    {
        if (chosenEntity != null && Selected == false)
        {
            hoveredEntity = chosenEntity;
            hoveredEntity.GetNode<FlashShaderController>("FlashController").Select();
            return true;
        }
        if (chosenEntity == null && Selected && hoveredEntity is RuntimePlantData)
        {
            hoveredEntity.GetNode<FlashShaderController>("FlashController").Deselect();
            hoveredEntity = null;
            return true;
        }
        if (hoveredEntity == null || chosenEntity == null) return false;
        if (chosenEntity != hoveredEntity && Selected)
        {
            hoveredEntity.GetNode<FlashShaderController>("FlashController").Deselect();
            hoveredEntity = chosenEntity;
            hoveredEntity.GetNode<FlashShaderController>("FlashController").Select();
            return true;
        }
        return hoveredEntity != null && hoveredEntity is RuntimeZombieData == false;
    }
    private bool TrySetDynEntity()
    {
        raycast.GlobalPosition = Cursor.GetCursorPosition();

        if (raycast.IsColliding())
        {
            var entity = ((Area2D)raycast.GetCollider()).GetParent() as Entity;

            if (entity == null) return false;

            if (Selected == false)
            {
                hoveredEntity = entity;
                hoveredEntity.GetNode<FlashShaderController>("FlashController").Select();
                return true;
            }
            if (hoveredEntity == null) return false;
            if (Selected && hoveredEntity != entity)
            {
                hoveredEntity.GetNode<FlashShaderController>("FlashController").Deselect();
                entity.GetNode<FlashShaderController>("FlashController").Select();
                hoveredEntity = entity;
                return true;
            }
        }
        else
        {
            hoveredEntity?.GetNode<FlashShaderController>("FlashController").Deselect();
            hoveredEntity = null;
            return false;
        }
        return hoveredEntity != null && hoveredEntity is RuntimeZombieData;
    }
    private void UpdateTimer()
    {
        ((ShaderMaterial)Material).SetShaderParameter("progress", 1.0-timer.TimeLeft/timer.WaitTime);
    }
    private void OnTimerTimeout()
    {
        Disabled = false;
    }
}