import React, { useContext, useState, useMemo, useRef, useEffect } from "react";
import equal from "fast-deep-equal";

import { Resource } from './Resource.js';
import { Placard } from './Placard.js';
import { GlobalContext } from './GlobalContext.js';
import { assetsPath } from "./Common.js";
import "./Hand.css";

const Development = ({type, card, onClick}) => {
  return (
    <div className={`Development ${card.played ? 'Selected' : ''}`}
      onClick={onClick}
      style={{
        backgroundImage:`url(${assetsPath}/gfx/card-${type}.png)`
      }}/>
  );
};

const Hand = ({buildActive, setBuildActive, setCardActive}) => {
  const { ws } = useContext(GlobalContext);
  const [priv, setPriv] = useState(undefined);
  const [color, setColor] = useState(undefined);
  const [turn, setTurn] = useState(undefined);
  const [longestRoad, setLongestRoad] = useState(undefined);
  const [largestArmy, setLargestArmy] = useState(undefined);
  const [development, setDevelopment] = useState([]);
  const [mostPorts, setMostPorts] = useState(undefined);
  const [mostDeveloped, setMostDeveloped] = useState(undefined);
  const [selected, setSelected] = useState(0);

  const fields = useMemo(() => [
    'private', 'turn', 'color', 'longestRoad', 'largestArmy', 'mostPorts', 'mostDeveloped'
  ], []);
  const onWsMessage = (event) => {
    const data = JSON.parse(event.data);
    switch (data.type) {
    case 'game-update':
      console.log(`hand - game-update: `, data.update);
      if ('private' in data.update && !equal(priv, data.update.private)) {
        setPriv(data.update.private);
      }   
      if ('turn' in data.update && !equal(turn, data.update.turn)) {
        setTurn(data.update.turn);
      }  
      if ('color' in data.update && color !== data.update.color) {
        setColor(data.update.color);
      }  
      if ('longestRoad' in data.update && longestRoad !== data.update.longestRoad) {
        setLongestRoad(data.update.longestRoad);
      }  
      if ('largestArmy' in data.update && largestArmy !== data.update.largestArmy) {
        setLargestArmy(data.update.largestArmy);
      }  
      if ('mostDeveloped' in data.update
        && data.update.mostDeveloped !== mostDeveloped) {
        setMostDeveloped(data.update.mostDeveloped);
      }
      if ('mostPorts' in data.update
        && data.update.mostPorts !== mostPorts) {
        setMostPorts(data.update.mostPorts);
      }
      break;
    default:
      break;
    }
  };
  const refWsMessage = useRef(onWsMessage);
  useEffect(() => { refWsMessage.current = onWsMessage; });
  useEffect(() => {
    if (!ws) { return; }
    const cbMessage = e => refWsMessage.current(e);
    ws.addEventListener('message', cbMessage);
    return () => { ws.removeEventListener('message', cbMessage); }
  }, [ws, refWsMessage]);
  useEffect(() => {
    if (!ws) { return; }
    ws.send(JSON.stringify({ 
      type: 'get', 
      fields
    }));
  }, [ws, fields]);

  useEffect(() => {
    if (!priv) {
      return;
    }
    
    const cardClicked = (card) => {
      setCardActive(card);
    }

    const stacks = {};
    priv.development.forEach(card =>
      (card.type in stacks)
      ? stacks[card.type].push(card)
      : stacks[card.type] = [card]);

    const development = [];
    for (let type in stacks) {
      const cards = stacks[type]
        .sort((A, B) => {
          if (A.played) {
            return -1;
          }
          if (B.played) {
            return +1;
          }
          return B.turn - A.turn; /* Put playable cards on top */
        }).map(card => <Development
        onClick={() => cardClicked(card)}
        card={card}
        key={`${type}-${card.card}`}
        type={`${type}-${card.card}`}/>);
      development.push(<div key={type} className="Stack">{ cards }</div>);
    }
    setDevelopment(development);
  }, [priv, setDevelopment, setCardActive]);

  useEffect(() => {
    const count = document.querySelectorAll('.Hand .CardGroup .Resource.Selected');
    if (count.length !== selected) {
      setSelected(count.length);
    }
  }, [setSelected, selected, turn]);

  if (!priv) {
    return <></>;
  }

  const cardSelected = (event) => {
    const count = document.querySelectorAll('.Hand .CardGroup .Resource.Selected');
    setSelected(count.length);
  }

  return <div className="Hand">
    {<div className="CardsSelected"
      style={selected === 0 ? { display: 'none' } : {}}>
      {selected} cards selected
    </div>}
    <div className="CardGroup">  
      <Resource type="wood" count={priv.wood} onClick={cardSelected}/>
      <Resource type="wheat" count={priv.wheat} onClick={cardSelected} />
      <Resource type="stone" count={priv.stone} onClick={cardSelected} />
      <Resource type="brick" count={priv.brick} onClick={cardSelected} />
      <Resource type="sheep" count={priv.sheep} onClick={cardSelected} />
    </div>
    <div className="CardGroup">
      { development }
    </div>
    {mostDeveloped && mostDeveloped === color &&
      <Placard
        type='most-developed'
      />
    }
    {mostPorts && mostPorts === color &&
      <Placard
        type='port-of-call'
      />
    }
    { longestRoad && longestRoad === color &&
      <Placard
        type='longest-road'
      />
    }
    { largestArmy && largestArmy === color &&
      <Placard
        type='largest-army'
      />
    }
    <Placard className="BuildCard"
      {...{buildActive, setBuildActive}}
      disabled={!turn || !turn.roll}
      type={color}/>
  </div>;
}

export { Hand };