riversong-code-showcase/Source/Riversong/Game/UI/Panels/BuildingPlacementTooltip/BuildingPlacementTooltipController.cs

using System;
using Cysharp.Threading.Tasks;
using UnityEngine.InputSystem;
using UnityEngine.UIElements;

namespace DanieleMarotta.RiversongCodeShowcase
{
    public class BuildingPlacementTooltipController : UIControllerSystem<BuildingPlacementTooltipUIView>, IUpdatable
    {
        [InjectService]
        private IEditingService _editingService;

        [InjectService]
        private IPointerService _pointerService;

        [InjectService]
        private TextFormatHelper _textFormatHelper;

        public BuildingPlacementTooltipController(IServiceLocator serviceLocator) : base(serviceLocator)
        {
        }

        protected override BuildingPlacementTooltipUIView View => UIRoot.GetView<BuildingPlacementTooltipUIView>();

        public override async UniTask InitializeAsync()
        {
            await base.InitializeAsync();

            View.RootElement.SetPickingModeRecursive(PickingMode.Ignore);
        }

        public void Update()
        {
            if (_pointerService.IsPointerOverUI)
            {
                View.Clear();
                return;
            }

            var editingState = _editingService.EditingState;

            if (editingState.ActiveTool != editingState.BuildTool)
            {
                View.Clear();
                return;
            }

            var validation = editingState.BuildTool.GetLastValidationResult();
            if (validation == EditToolValidationResult.Success)
            {
                View.Clear();
                return;
            }

            var buildingName = _textFormatHelper.FormatImportantText(editingState.BuildTool.Building.BuildingName);
            var errorFormat = GetFailedValidationFormat(validation);
            var text = string.Format(errorFormat, buildingName);

            View.SetText(text);
            View.RootElement.SetAbsoluteScreenPosition(Mouse.current.position.ReadValue());
        }

        private string GetFailedValidationFormat(EditToolValidationResult validation)
        {
            switch (validation)
            {
                case EditToolValidationResult.BlockedTile:
                    return "There is an obstacle here";

                case EditToolValidationResult.CanOnlyBePlacedNearWater:
                    return "The {0} must be placed near water";

                case EditToolValidationResult.CanOnlyBePlacedOnFertileGround:
                    return "The {0} must be placed on fertile ground";

                default:
                    throw new ArgumentOutOfRangeException();
            }
        }
    }
}