voxel-building-system/Runtime/BuildingBlueprintController.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using KairoEngine.Core;
using Sirenix.OdinInspector;

namespace KairoEngine.VoxelBuildingSystem
{
    [HideMonoScript]
    public class BuildingBlueprintController : MonoBehaviour
    {
        public VoxelBuildingSystem buildingSystem;
        public Transform currentBlueprint;
        [BoxGroup("Materials")] public Material blueprintMain;
        [BoxGroup("Materials")] public Material blueprintDetail;
        [BoxGroup("Materials")] public Material invalidMain;
        [BoxGroup("Materials")] public Material invalidDetail;

        private void Start() {
            RefreshVisual();
            GenericEvents.StartListening("OnBuildingTemplateChanged", OnBuildingTemplateChanged);
        }

        private void OnDisable()
        {
            GenericEvents.StopListening("OnBuildingTemplateChanged", OnBuildingTemplateChanged);
        }

        private void OnBuildingTemplateChanged() {
            RefreshVisual();
        }

        private void LateUpdate() {
            if(currentBlueprint == null) return;
            Vector3 targetPosition = buildingSystem.GetMouseWorldSnappedPosition();
            //targetPosition.y = 1f;
            currentBlueprint.transform.position = Vector3.Lerp(currentBlueprint.transform.position, targetPosition, Time.deltaTime * 15f);
            currentBlueprint.transform.rotation = Quaternion.Lerp(transform.rotation, buildingSystem.transform.rotation, Time.deltaTime * 15f);
            if(buildingSystem.tool == VoxelBuildingTool.Build) currentBlueprint.gameObject.SetActive(true);
            else currentBlueprint.gameObject.SetActive(false);
            CanBuild();
        }

        private void RefreshVisual() {
            if (currentBlueprint != null) {
                Destroy(currentBlueprint.gameObject);
                currentBlueprint = null;
            }
            BuildingTemplate buildingTemplate = buildingSystem.buildingTemplates[buildingSystem.currentBuildingTemplate];
            if (buildingTemplate != null) {
                currentBlueprint = Instantiate(buildingTemplate.visual, Vector3.zero, Quaternion.identity);
                currentBlueprint.parent = transform;
                currentBlueprint.localPosition = Vector3.zero;
                currentBlueprint.localEulerAngles = Vector3.zero;
            }
        }

        private bool canBuild;
        private Vector3Int lastPosition;
        private int lastTemplateIndex;
        private void CanBuild()
        {
            Vector3Int pos = buildingSystem.GetMouseVoxelPosition();
            int templateIndex = buildingSystem.currentBuildingTemplate;
            if(lastPosition != pos || lastTemplateIndex != templateIndex)
            {
                //Debug.Log("Position changed, updating blueprint materials");
                canBuild = buildingSystem.CanPlaceBuilding(pos, templateIndex);
                lastPosition = pos;
                lastTemplateIndex = templateIndex;
                ChangeMaterials();
            }
        }

        private void ChangeMaterials()
        { 
            MeshRenderer[] renderers = currentBlueprint.GetComponentsInChildren<MeshRenderer>(false);
            //Debug.Log($"Changing materials in {renderers.Length} renderers");
            for (int i = 0; i < renderers.Length; i++)
            {
                Material[] materials = renderers[i].materials;
                //Debug.Log($"Found {renderers[i].materials.Length} materials in render {i}");
                for (int a = 0; a < materials.Length; a++)
                {
                    if(materials[a].name.Contains("Main"))
                    {
                        if(canBuild) materials[a] = blueprintMain;
                        else materials[a] = invalidMain;
                    }
                    else if(materials[a].name.Contains("Detail"))
                    {
                        if(canBuild) materials[a] = blueprintDetail;
                        else materials[a] = invalidDetail;
                    }
                }
                renderers[i].materials = materials;
            }
        }
        
    }
}