trail-into-darkness/Assets/Code/GameState/UI/PartyGuiView.cs

using System.Collections.Generic;
using Nox.UI;
using UnityEngine;
using Object = UnityEngine.Object;

namespace Nox.Game.UI {
    public class PartyGuiView {
        private readonly Transform portraitsContainer;
        private readonly PartyMemberSlot slotPrefab;
        private readonly PortraitsHolder portraitsHolder;
        private readonly List<PartyMemberSlot> activeSlots = new();

        private PartyDefinition trackedParty;
        private int trackedMemberCount;

        public PartyGuiView(Transform portraitsContainer, PartyMemberSlot slotPrefab, PortraitsHolder portraitsHolder) {
            this.portraitsContainer = portraitsContainer;
            this.slotPrefab = slotPrefab;
            this.portraitsHolder = portraitsHolder;
        }

        public void Initialize(PartyDefinition party) {
            trackedParty = party;
            trackedMemberCount = 0;
            RebuildSlots();
        }

        public void Tick() {
            if(trackedParty == null) {
                return;
            }

            // Rebuild if member count changed
            if(trackedParty.members.Count != trackedMemberCount) {
                RebuildSlots();
            }

            // Update dynamic values (health, mana)
            for(int i = 0; i < activeSlots.Count && i < trackedParty.members.Count; i++) {
                var member = trackedParty.members[i];
                var slot = activeSlots[i];
                UpdateSlotStats(slot, member);
            }
        }

        private void RebuildSlots() {
            // Clear existing
            foreach(var slot in activeSlots) {
                Object.Destroy(slot.gameObject);
            }
            activeSlots.Clear();

            if(trackedParty?.members == null) {
                return;
            }

            trackedMemberCount = trackedParty.members.Count;

            foreach(var member in trackedParty.members) {
                var slot = Object.Instantiate(slotPrefab, portraitsContainer);
                slot.gameObject.SetActive(true);

                // Portrait
                if(portraitsHolder != null && portraitsHolder.portraits.Length > 0) {
                    var idx = Mathf.Clamp(member.PortraitIndex, 0, portraitsHolder.portraits.Length - 1);
                    slot.portrait.sprite = portraitsHolder.portraits[idx];
                }

                // Name
                if(slot.nameText != null) {
                    slot.nameText.text = member.Name;
                }

                UpdateSlotStats(slot, member);
                activeSlots.Add(slot);
            }
        }

        private static void UpdateSlotStats(PartyMemberSlot slot, CharacterDefinition member) {
            var health = member.Stats.GetValue(StatType.Health);
            var mana = member.Stats.GetValue(StatType.Mana);

            if(slot.healthBar != null) {
                slot.healthBar.fillAmount = Mathf.Clamp01(health / 100f);
            }
            if(slot.healthText != null) {
                slot.healthText.text = health.ToString();
            }

            if(slot.manaBar != null) {
                slot.manaBar.fillAmount = Mathf.Clamp01(mana / 100f);
            }
            if(slot.manaText != null) {
                slot.manaText.text = mana.ToString();
            }
        }

        public void Dispose() {
            foreach(var slot in activeSlots) {
                if(slot != null) {
                    Object.Destroy(slot.gameObject);
                }
            }
            activeSlots.Clear();
        }
    }
}