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

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

        public CardInstance playingCard;
        public CardLocation playingCardOriginalLocation;
        public Dictionary<CardInstance, CardLocation> selectedCards;
        protected override void Awake()
        {
            base.Awake();
            selectedCards = new Dictionary<CardInstance, CardLocation>();
        }

        public override void Show()
        {
            base.Show();
            canvasGroup.alpha = 1;
            canvasGroup.interactable = true;
            canvasGroup.blocksRaycasts = true;
            selectedCards.Clear();
            confirmButton.interactable = !isForcedMaximum;
        }
        
        public void Setup(CardInstance playingCard, int maxSelection, bool forcedMaximum = false)
        {
            this.maximumSelection = maxSelection;
            this.isForcedMaximum = forcedMaximum;
            
            this.playingCard = playingCard;
            string pileName = playingCard.currentPileName;
            int index = playingCard.deck.Pile(pileName).IndexOf(playingCard);
            playingCardOriginalLocation = new CardLocation(pileName, index);
            CombatUIManager.Instance.deckPage.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.Keys.Contains(cardView.cardInstance))
            {
                return;
            }
            
            string pileName = cardView.cardInstance.currentPileName;
            int index = cardView.cardInstance.deck.Pile(pileName).IndexOf(cardView.cardInstance);
            
            CardLocation location = new CardLocation(pileName, index);
            selectedCards.Add(cardView.cardInstance, location);
            
            CombatUIManager.Instance.deckPage.Pile(cardView.cardInstance.currentPileName).RemoveCard(cardView);
            cardView.transform.SetParent(selectionContainer, false);

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

        public void Deselect(HandCardView cardView)
        {
            CardLocation location = selectedCards[cardView.cardInstance];
            PileBase uiPile = CombatUIManager.Instance.deckPage.Pile(location.pileName);
            selectedCards.Remove(cardView.cardInstance);
            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.deckPage.Pile(playingCardOriginalLocation.pileName);
            playingCardPile.AddCard(playingCard.handCardView);
            playingCard.handCardView.transform.SetParent(playingCardPile.rectTransform, false);
            playingCard.handCardView.transform.SetSiblingIndex(playingCardOriginalLocation.index);
            playingCard.handCardView.isOccupied = false;
            
            //Selected Cards回归原位
            foreach (KeyValuePair<CardInstance,CardLocation> selectedCard in selectedCards)
            {
                CardLocation location = selectedCard.Value;
                PileBase uiPile = CombatUIManager.Instance.deckPage.Pile(location.pileName);
                HandCardView handCardView = selectedCard.Key.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
        }
    }

    public class CardLocation
    {
        public string pileName;
        public int index;

        public CardLocation(string pileName, int index)
        {
            this.pileName = pileName;
            this.index = index;
        }
    }
}