using System.Collections.Generic;
using System.Text;
using TMPro;
using UnityEngine;
using UnityEngine.UI;
namespace DepthsOfGreed.HandbookUI
{
    public sealed class HandbookIndexController : MonoBehaviour
    {
        [SerializeField] private Button[] filterButtons, entryButtons;
        [SerializeField] private TMP_Text[] entryNames;
        [SerializeField] private Image[] entryIcons;
        [SerializeField] private TMP_Text detailName, description, emptyMessage;
        [SerializeField] private Image detailIcon;
        [SerializeField] private Sprite placeholderIcon;
        private sealed class Item { public HandbookTowerEntry tower; public HandbookEnemyEntry enemy; public string Name => tower ? tower.displayName : enemy.displayName; public Sprite Icon => tower ? tower.icon : enemy.icon; }
        private readonly List<Item> all = new List<Item>(), filtered = new List<Item>();
        public HandbookTowerEntry SelectedEntry { get; private set; }
        public HandbookEnemyEntry SelectedEnemy { get; private set; }
        public int VisibleEntryCount => filtered.Count;
        private int filter = -1;
        public void Initialize(HandbookTowerCatalog catalog)
        {
            if (catalog.towers != null) foreach (var t in catalog.towers) if (t) all.Add(new Item { tower = t });
            if (catalog.enemies != null) foreach (var e in catalog.enemies) if (e) all.Add(new Item { enemy = e });
            for (int i = 0; i < filterButtons.Length; i++) { int n = i; filterButtons[i].onClick.AddListener(() => SelectFilter(n)); }
            for (int i = 0; i < entryButtons.Length; i++) { int n = i; entryButtons[i].onClick.AddListener(() => SelectEntry(n)); }
            ResetForEntry();
        }
        public void ResetForEntry() { SelectFilter(0, true); }
        public void SelectFilter(int value, bool force = false)
        {
            if (value < 0 || value > 4 || (!force && value == filter)) return;
            filter = value; filtered.Clear();
            foreach (var item in all)
                if (value == 0 || (value == 1 && item.tower && (int)item.tower.menuGroup < 2) || (value == 2 && item.tower && item.tower.menuGroup == BuildMenuGroup.Anlagen) || (value == 3 && item.tower && item.tower.menuGroup == BuildMenuGroup.Einsaetze) || (value == 4 && item.enemy)) filtered.Add(item);
            ClearSelection(); Render();
            for (int i = 0; i < filterButtons.Length; i++) { filterButtons[i].image.color = Color.white; var c = filterButtons[i].colors; c.normalColor = i == value ? new Color(1, 0.76f, 0.35f) : new Color(0.87f, 0.84f, 0.75f); c.selectedColor = c.normalColor; filterButtons[i].colors = c; }
        }
        private void Render()
        {
            if (filtered.Count > entryButtons.Length) Debug.LogError("Index: Anzahl vorbereiteter Auswahlfelder erhöhen.", this);
            for (int i = 0; i < entryButtons.Length; i++)
            {
                entryButtons[i].gameObject.SetActive(i < filtered.Count);
                if (i >= filtered.Count) continue;
                var item = filtered[i]; entryNames[i].text = item.Name; entryIcons[i].sprite = item.Icon ? item.Icon : placeholderIcon; entryIcons[i].color = item.Icon ? Color.white : Color.gray;
                bool active = (item.tower && item.tower == SelectedEntry) || (item.enemy && item.enemy == SelectedEnemy);
                entryButtons[i].image.color = active ? new Color(0.58f, 0.58f, 0.58f) : new Color(0.9f, 0.88f, 0.81f);
            }
            emptyMessage.gameObject.SetActive(filtered.Count == 0);
        }
        public void SelectEntry(int index)
        {
            if (index < 0 || index >= filtered.Count) return;
            var item = filtered[index]; SelectedEntry = item.tower; SelectedEnemy = item.enemy;
            detailName.text = item.Name; detailIcon.gameObject.SetActive(true); detailIcon.sprite = item.Icon ? item.Icon : placeholderIcon; detailIcon.color = item.Icon ? Color.white : Color.gray;
            var text = new StringBuilder(item.tower ? item.tower.description : item.enemy.description);
            if (item.tower)
            {
                var t = item.tower; text.Append("\n\nBaufläche: ").Append(t.region == BuildRegion.WallRing ? "Mauer" : t.region == BuildRegion.Interior ? "Innenfeld" : "Schleuse"); string price = HandbookCostText.Format(t.energyCost, t.entrailsCost); if (price.Length > 0) text.Append("\nKosten: ").Append(price);
                if (t.deploymentCooldown > 0) text.Append(" · Cooldown: ").Append(t.deploymentCooldown).Append(" s");
                if (t.upgradeable) { text.Append("\n\nVerbesserungen:"); foreach (var u in t.upgrades) text.Append("\n").Append(u.title).Append(": ").Append(u.description).Append(HandbookCostText.Format(u.energyCost, u.entrailsCost) is string upgradePrice && upgradePrice.Length > 0 ? " (" + upgradePrice + ")" : ""); }
            }
            description.text = text.ToString(); Render();
        }
        public void ClearSelection() { SelectedEntry = null; SelectedEnemy = null; detailIcon.gameObject.SetActive(false); detailName.text = ""; description.text = "Wähle links einen Eintrag aus."; }
    }
}