using System.Collections;
using TMPro;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;

namespace DepthsOfGreed.HandbookUI
{
    public sealed class TowerCardView : MonoBehaviour, IPointerClickHandler, IBeginDragHandler, IDragHandler, IEndDragHandler, IPointerEnterHandler, IPointerExitHandler
    {
        public HandbookTowerEntry Entry { get; private set; }
        private BuildMenuController menu;
        private GameObject front, back;
        private TMP_Text nameText, costText, statsText, infoText;
        private Coroutine flipRoutine;
        private Vector3 originalScale;
        private bool showingBack, dragged;
        private Image icon;
        private Sprite placeholderSprite;
        private Color placeholderColor;

        public void Initialize(BuildMenuController owner)
        {
            menu = owner;
            front = transform.Find("Front").gameObject;
            back = transform.Find("Back").gameObject;
            nameText = front.transform.Find("NameText").GetComponent<TMP_Text>();
            costText = front.transform.Find("CostText").GetComponent<TMP_Text>();
            statsText = front.transform.Find("StatsText").GetComponent<TMP_Text>();
            infoText = back.transform.Find("InfoText").GetComponent<TMP_Text>();
            icon = front.transform.Find("TowerIcon").GetComponent<Image>();
            placeholderSprite = icon.sprite;
            placeholderColor = icon.color;
            originalScale = transform.localScale;
            foreach (var text in GetComponentsInChildren<TMP_Text>(true))
            {
                text.raycastTarget = false;
                text.color = Color.black;
                text.enableAutoSizing = true;
                text.fontSizeMin = 14;
                text.fontSizeMax = text.fontSize;
            }
            SetBack(false, true);
        }

        public void Bind(HandbookTowerEntry entry)
        {
            Entry = entry;
            nameText.text = entry.displayName;
            string price = HandbookCostText.Format(entry.energyCost, entry.entrailsCost);
            costText.text = price.Length > 0 ? "Kosten: " + price : "";
            costText.gameObject.SetActive(price.Length > 0);
            statsText.text = entry.summary;
            infoText.text = entry.description;
            icon.sprite = entry.icon ? entry.icon : placeholderSprite;
            icon.color = entry.icon ? Color.white : placeholderColor;
            icon.preserveAspect = true;
        }

        public void OnPointerClick(PointerEventData data)
        {
            if (data.button == PointerEventData.InputButton.Left && !data.dragging && !dragged)
                menu.ToggleCard(this);
            dragged = false;
        }
        public void OnPointerEnter(PointerEventData data) { if (menu.Placement) menu.Placement.ShowCardHint(Entry); }
        public void OnPointerExit(PointerEventData data) { if (menu.Placement) menu.Placement.ClearCardHint(); }

        public void OnBeginDrag(PointerEventData data)
        {
            dragged = true;
            if (data.button == PointerEventData.InputButton.Left && !showingBack && menu.Placement)
                menu.Placement.Begin(Entry, data.position);
        }
        public void OnDrag(PointerEventData data)
        {
            if (menu.Placement) menu.Placement.Move(data.position);
        }
        public void OnEndDrag(PointerEventData data)
        {
            if (menu.Placement) menu.Placement.End(data.position);
            dragged = false;
        }

        public void SetBack(bool showBack, bool instant = false)
        {
            showingBack = showBack;
            if (flipRoutine != null) StopCoroutine(flipRoutine);
            flipRoutine = null;
            if (instant || !isActiveAndEnabled)
            {
                transform.localScale = originalScale;
                front.SetActive(!showBack);
                back.SetActive(showBack);
            }
            else flipRoutine = StartCoroutine(Flip(showBack));
        }

        private IEnumerator Flip(bool showBack)
        {
            float startingY = transform.localScale.y;
            const float halfDuration = 0.09f;
            for (float elapsed = 0; elapsed < halfDuration; elapsed += Time.unscaledDeltaTime)
            {
                transform.localScale = new Vector3(originalScale.x, Mathf.Lerp(startingY, 0.02f, elapsed / halfDuration), originalScale.z);
                yield return null;
            }
            front.SetActive(!showBack);
            back.SetActive(showBack);
            for (float elapsed = 0; elapsed < halfDuration; elapsed += Time.unscaledDeltaTime)
            {
                transform.localScale = new Vector3(originalScale.x, Mathf.Lerp(0.02f, originalScale.y, elapsed / halfDuration), originalScale.z);
                yield return null;
            }
            transform.localScale = originalScale;
            flipRoutine = null;
        }

        private void OnDisable()
        {
            if (flipRoutine != null) StopCoroutine(flipRoutine);
            flipRoutine = null;
            transform.localScale = originalScale;
        }
    }
}