using System;
using System.Collections.Generic;
using System.Linq;
using Continentis.MainGame.Card;
using NUnit.Framework;
using TMPro;
using UniRx;
using UnityEngine;
using UnityEngine.UI;

namespace Continentis.MainGame.UI
{
    public class HandCardSelectionInterface : WaitableUIElement
    {
        public string title;
        public int maximumSelection;
        public bool isForcedMaximum;
        
        public CanvasGroup canvasGroup;
        public TMP_Text titleText;
        public RectTransform selectionContainer;
        public RectTransform playingCardContainer;
        public Button confirmButton;

        public CardInstance playingCard;
        public List<CardInstance> selectedCards;
        public Func<CardInstance, bool> selectionCondition;
        
        protected override void Awake()
        {
            base.Awake();
            selectedCards = new List<CardInstance>();
        }

        public override void Show()
        {
            base.Show();
            canvasGroup.alpha = 1;
            canvasGroup.interactable = true;
            canvasGroup.blocksRaycasts = true;
            selectedCards.Clear();
            confirmButton.interactable = !isForcedMaximum;
        }
        
        public void Setup(string title, CardInstance playingCard, int maxSelection, 
            Func<CardInstance, bool> condition = null, bool forcedMaximum = false)
        {
            this.title = title;
            this.maximumSelection = maxSelection;
            this.isForcedMaximum = forcedMaximum;
            this.selectionCondition = condition ?? (card => true);
            this.titleText.text = title;
            
            this.playingCard = playingCard;
            string pileName = playingCard.cardLocation.pileName;
            CombatUIManager.Instance.combatMainPage.Pile(pileName).RemoveCard(playingCard.handCardView);
            
            playingCard.handCardView.transform.SetParent(playingCardContainer, false);
            playingCard.handCardView.transform.localPosition = Vector3.zero;
            playingCard.handCardView.isOccupied = true;
        }
        
        public override void Hide()
        {
            base.Hide();
            canvasGroup.alpha = 0;
            canvasGroup.interactable = false;
            canvasGroup.blocksRaycasts = false;
        }

        public override IObservable<Unit> OnConfirm()
        {
            return confirmButton.OnClickAsObservable().First().Do(_ => EndSelection()).AsUnitObservable();
        }

        public void Select(HandCardView cardView)
        {
            if (maximumSelection > 0 && selectedCards.Count >= maximumSelection)
            {
                return;
            }
            
            if (selectedCards.Contains(cardView.card))
            {
                return;
            }
            
            if (!selectionCondition(cardView.card))
            {
                return;
            }
            
            string pileName = cardView.card.cardLocation.pileName;
            int index = cardView.card.deck.Pile(pileName).IndexOf(cardView.card);
            selectedCards.Add(cardView.card);
            
            CombatUIManager.Instance.combatMainPage.Pile(pileName).RemoveCard(cardView);
            cardView.transform.SetParent(selectionContainer, false);

            if (isForcedMaximum)
            {
                confirmButton.interactable = CheckNoMoreAvailable() || selectedCards.Count == maximumSelection;
            }
        }

        public void Deselect(HandCardView cardView)
        {
            CardLocation location = cardView.card.cardLocation;
            PileBase uiPile = CombatUIManager.Instance.combatMainPage.Pile(location.pileName);
            selectedCards.Remove(cardView.card);
            uiPile.AddCard(cardView);
            cardView.transform.SetParent(uiPile.rectTransform, false);
            cardView.transform.SetSiblingIndex(location.index);
        }

        public void EndSelection()
        {
            //Playing Card回归原位
            PileBase playingCardPile = CombatUIManager.Instance.combatMainPage.Pile(playingCard.cardLocation.pileName);
            playingCardPile.AddCard(playingCard.handCardView);
            playingCard.handCardView.transform.SetParent(playingCardPile.rectTransform, false);
            playingCard.handCardView.transform.SetSiblingIndex(playingCard.cardLocation.index);
            playingCard.handCardView.isOccupied = false;
            
            //Selected Cards回归原位
            foreach (CardInstance selectedCard in selectedCards)
            {
                CardLocation location = selectedCard.cardLocation;
                PileBase uiPile = CombatUIManager.Instance.combatMainPage.Pile(location.pileName);
                HandCardView handCardView = selectedCard.handCardView;
                uiPile.AddCard(handCardView);
                handCardView.transform.SetParent(uiPile.rectTransform, false);
                handCardView.transform.SetSiblingIndex(location.index);
            }
        }

        public bool CheckNoMoreAvailable()
        {
            return false; //TODO: 后续完善
        }
    }
}