import React, { useEffect, useState, useContext, useRef, useMemo } from "react";
import equal from "fast-deep-equal";
import { assetsPath, debounce } from "./Common.js";
import "./Board.css";
import { GlobalContext } from "./GlobalContext.js";
const rows = [3, 4, 5, 4, 3, 2]; /* The final row of 2 is to place roads and corners */

const
  hexRatio = 1.1547,
  tileWidth = 67,
  tileHalfWidth = tileWidth * 0.5,
  tileHeight = tileWidth * hexRatio,
  tileHalfHeight = tileHeight * 0.5,
  radius = tileHeight * 2,
  borderOffsetX = 86, /* ~1/10th border image width... hand tuned */
  borderOffsetY = 3;

/* Actual sizing */
const
  tileImageWidth = 90, /* Based on hand tuned and image width */
  tileImageHeight = tileImageWidth/hexRatio,
  borderImageWidth = (2 + 2/3) * tileImageWidth, /* 2.667 * .Tile.width */
  borderImageHeight = borderImageWidth * 0.29; /* 0.29 * .Border.height */

const Board = () => {
  const { ws } = useContext(GlobalContext);
  const board = useRef();
  const [pipElements, setPipElements] = useState(<></>);
  const [borderElements, setBorderElements] = useState(<></>);
  const [tileElements, setTileElements] = useState(<></>);
  const [cornerElements, setCornerElements] = useState(<></>);
  const [roadElements, setRoadElements] = useState(<></>);
  const [ signature, setSignature ] = useState("");
  const [ generated, setGenerated ] = useState("");
  const [ robber, setRobber ] = useState(-1);
  const [ robberName, setRobberName ] = useState([]);
  const [ pips, setPips ] = useState();
  const [ pipOrder, setPipOrder ] = useState();
  const [ borders, setBorders ] = useState();
  const [ borderOrder, setBorderOrder ] = useState();
  const [ tiles, setTiles ] = useState();
  const [ tileOrder, setTileOrder ] = useState([]);
  const [ placements, setPlacements ] = useState(undefined);
  const [ turn, setTurn ] = useState({});
  const [ state, setState ] = useState("");
  const [ color, setColor ] = useState("");
  const [ longestRoadLength, setLongestRoadLength ] = useState(0);
  const fields = useMemo(() => [
    'signature', 'robber', 'robberName',
    'pips', 'pipOrder', 'borders', 'borderOrder', 'tiles', 'tileOrder',
    'placements', 'turn', 'state', 'color', 'longestRoadLength'
  ], []);

  /* Placements is a structure of roads and corners arrays
   * indicating what is stored at each of the locations
   * 
   * Corners consist of a type and color
   * Roads consist of a color, and longestRoad
   * 
   * See games.js resetGame, placeRoad, placeSettlement, placeCity,
   * and calculateRoadLengths
   * 
   * Returns: true === differences, false === same
   */
  const comparePlacements = (A, B) => {
    if (!A && !B) {
      return false; /* same */
    }
    if ((A && !B)
    || (!A && B)) {
      return true;
    }

    if ((A.roads.length !== B.roads.length)
    || (A.corners.length !== B.corners.length)) {
      return true;
    }

    /* Roads compare color and longestRoad */
    for (let i = 0; i < A.roads.length; i++) {
      if (A.roads[i].color !== B.roads[i].color) {
        return true;
      }
      if (A.roads[i].longestRoad !== B.roads[i].longestRoad) {
        return true;
      }
    }

    /* Corners compare type and color */
    for (let i = 0; i < A.corners.length; i++) {
      if (A.corners[i].type !== B.corners[i].type) {
        return true;
      }
      if (A.corners[i].color !== B.corners[i].color) {
        return true;
      }
    }

    return false; /* same */
  };

  const onWsMessage = (event) => {
    const data = JSON.parse(event.data);
    switch (data.type) {
    case 'game-update':
      console.log(`board - game update`, data.update);
      if ('robber' in data.update && data.update.robber !== robber) {
        setRobber(data.update.robber);
      }
      
      if ('robberName' in data.update && data.update.robberName !== robberName) {
        setRobberName(data.update.robberName);
      }

      if ('state' in data.update && data.update.state !== state) {
        setState(data.update.state);
      }

      if ('color' in data.update && data.update.color !== color) {
        setColor(data.update.color);
      }

      if ('longestRoadLength' in data.update 
        && data.update.longestRoadLength !== longestRoadLength) {
        setLongestRoadLength(data.update.longestRoadLength);
      }

      if ('turn' in data.update) {
        if (!equal(data.update.turn, turn)) {
          console.log(`board - turn`, data.update.turn);
          setTurn(data.update.turn);
        }
      }

      if ('placement' in data.update) {
        if (!equal(data.update.placements, placements)) {
          console.log(`board - placements`, data.update.placements);
          setPlacements(data.update.placements);
        }
      }

      if ('signature' in data.update && data.update.signature !== signature) {
        setSignature(data.update.signature);

        /* The following are only updated if there is a new game 
         * signature */
        
        if ('pipOrder' in data.update) {
          setPipOrder(data.update.pipOrder);
        }

        if ('borderOrder' in data.update) {
          setBorderOrder(data.update.borderOrder);
        }
        
        if ('tileOrder' in data.update) {
          setTileOrder(data.update.tileOrder);
        }
      }

      /* This is permanent static data from the server -- do not update
       * once set */
      if ('pips' in data.update && !pips) {
        setPips(data.update.pips);
      }
      if ('tiles' in data.update && !tiles) {
        setTiles(data.update.tiles);
      }
      if ('borders' in data.update && !borders) {
        setBorders(data.update.borders);
      }
      break;
    default:
      break;
    }
  };
 
  const refWsMessage = useRef(onWsMessage);
  useEffect(() => { refWsMessage.current = onWsMessage; });
  
  useEffect(() => {
    if (!board.current) {
      return;
    }

    const onResize = debounce(() => {
      if (!board.current) {
        return;
      }
     /* Adjust the 'transform: scale' for the BoardBox
      * so the board fills the Board 
      *
      * The board is H tall, and H * hexRatio wide */
      const width = board.current.offsetWidth,
        height = board.current.offsetHeight;
      let _transform;
      if (height * hexRatio > width) {
        _transform = width / (450. * hexRatio);
      } else {
        _transform = height / (450.);
      }
      
      const boardBox = board.current.querySelector('.BoardBox');
      if (boardBox) {
        console.log(`Setting transofrm scale to ${_transform}`);
        boardBox.style.transform = `scale(${_transform})`;
      }
    }, 250);

    window.addEventListener('resize', onResize);
    onResize();

    return () => {
      window.removeEventListener('resize', onResize);
    } 
  }, [board]);

  useEffect(() => {
    if (!ws) {
      return;
    }
    console.log('board - bind');
    const cbMessage = e => refWsMessage.current(e);
    ws.addEventListener('message', cbMessage);
    return () => {
      console.log('board - unbind');
      ws.removeEventListener('message', cbMessage);
    }
  }, [ws, refWsMessage]);

  useEffect(() => {
    if (!ws) {
      return;
    }
    ws.send(JSON.stringify({ 
      type: 'get', 
      fields
    }));
  }, [ws, fields]);

  const Tile = ({tile}) => {
    const onClick = (event) => {
      console.log(`Tile clicked: ${tile.index}`);
    };

    return <div className="Tile"
      onClick={onClick}
      data-index={tile.index}
      style={{
        top: `${tile.top}px`,
        left: `${tile.left}px`,
        width: `${tileImageWidth}px`, 
        height: `${tileImageHeight}px`,         
        backgroundImage: `url(${assetsPath}/gfx/tiles-${tile.type}.png)`,
        backgroundPositionY: `-${tile.card*tileHeight}px`
      }}
    ><div className="Tile-Shape"/></div>;
  };

  const sendPlacement = (type, index) => {
    ws.send(JSON.stringify({
      type, index
    }));
  };

  const Road = ({road}) => {
    const onClick = (event) => {
      console.log(`Road clicked: ${road.index}`);
      sendPlacement('place-road', road.index);
    };

    return <div className="Road"
      onClick={onClick}
      data-index={road.index}
      style={{
        transform: `translate(-50%, -50%) rotate(${road.angle}deg)`,
        top: `${road.top}px`,
        left: `${road.left}px`
      }}
    ><div className="Road-Shape"/></div>;
  };
  
  const Corner = ({corner}) => {
    const onClick = (event) => {
      let type;
      if (event.currentTarget.getAttribute('data-type') === 'settlement') {
        type = 'place-city';
      } else {
        type = 'place-settlement';
      }
      sendPlacement(type, corner.index);
    };

  return <div className="Corner"
      onClick={onClick}
      data-index={corner.index}
      style={{
        top: `${corner.top}px`,
        left: `${corner.left}px`
      }}
    ><div className="Corner-Shape"/></div>;
  };

  const Pip = ({pip}) => {
    const onClick = (event) => {
      sendPlacement('place-robber', pip.index);
    };

    return <div className="Pip"
      onClick={onClick}
      data-roll={pip.roll}
      data-index={pip.index}
      style={{
        top: `${pip.top}px`,
        left: `${pip.left}px`,
        backgroundImage: `url(${assetsPath}/gfx/pip-numbers.png)`,
        backgroundPositionX: `${ 100. * (pip.order % 6) / 5.}%`,
        backgroundPositionY: `${ 100 * Math.floor(pip.order / 6) / 5. }%`
      }}
    ><div className="Pip-Shape"/></div>;
  };

  useEffect(() => {
    if (!signature) {
      return;
    }

    if (signature === generated) {
      return;
    }

    if (!pips || !pipOrder || !borders || !borderOrder 
    || !tiles || !tileOrder) {
      return;
    }

    console.log(`board - Generate board - ${signature}`);
    
    const generateRoads = () => {
      let row = 0, rowCount = 0;
      let y = -2.5 + tileHalfWidth - (rows.length - 1) * 0.5 * tileWidth,
        x = -tileHalfHeight -(rows[row] - 1) * 0.5 * tileHeight;

      let index = 0;
      let road;

      const corners = [];
      
      for (let i = 0; i < 21; i++) {
        const lastRow = row === rows.length - 1;
        if (row > 2 && rowCount === 0) {
          road = {
            index: index++,
            angle: -60,
            top: y-0.5*tileHalfHeight,
            left: x-tileHalfHeight
          };
          corners.push(<Road key={`road-${index}}`} road={road}/>);
        }

        road = {
          index: index++,
          angle: 240,
          top: y,
          left: x
        };
        corners.push(<Road key={`road-${index}}`} road={road}/>);

        road = {
          index: index++,
          angle: -60,
          top: y-0.5*tileHalfHeight,
          left: x+tileHalfHeight
        };
        corners.push(<Road key={`road-${index}}`} road={road}/>);

        if (!lastRow) {
          road = {
            index: index++,
            angle: 0,
            top: y,
            left: x
          };
          corners.push(<Road key={`road-${index}}`} road={road}/>);
        }

        if (++rowCount === rows[row]) {
          if (!lastRow) {
            road = {
              index: index++,
              angle: 0,
              top: y,
              left: x+2.*tileHalfHeight
            };
            corners.push(<Road key={`road-${index}}`} road={road}/>);
          }

          if (row > 2) {
            road = {
              index: index++,
              angle: 60,
              top: y-0.5*tileHalfHeight,
              left: x+3.*tileHalfHeight
            };
            corners.push(<Road key={`road-${index}}`} road={road}/>);
          }
    
          row++;
          rowCount = 0;
          y += tileHeight - 10.5;
          x = -tileHalfHeight - (rows[row] - 1) * 0.5 * tileHeight;
        } else {
          x += tileHeight;
        }
      }
      return corners;
    }
    
    const generateCorners = () => {
      let row = 0, rowCount = 0;
      let y = -8 + 0.5 * tileHalfWidth - (rows.length - 1) * 0.5 * tileWidth,
        x = -tileHalfHeight -(rows[row] - 1) * 0.5 * tileHeight;
      let index = 0;
      const corners = [];
      let corner;

      for (let i = 0; i < 21; i++) {
        if (row > 2 && rowCount === 0) {
          corner = {
            index: index++,
            top: y-0.5*tileHalfHeight,
            left: x-tileHalfHeight
          };
          corners.push(<Corner key={`corner-${index}}`} corner={corner}/>);
        }

        corner = {
          index: index++,
          top: y,
          left: x
        };
        corners.push(<Corner key={`corner-${index}}`} corner={corner}/>);

        corner = {
          index: index++,
          top: y-0.5*tileHalfHeight,
          left: x+tileHalfHeight
        };
        corners.push(<Corner key={`corner-${index}}`} corner={corner}/>);
          
        if (++rowCount === rows[row]) {
          corner = {
            index: index++,
            top: y,
            left: x+2.*tileHalfHeight
          };
          corners.push(<Corner key={`corner-${index}}`} corner={corner}/>);
          
          if (row > 2) {
            corner = {
              index: index++,
              top: y-0.5*tileHalfHeight,
              left: x+3.*tileHalfHeight
            };
            corners.push(<Corner key={`corner-${index}}`} corner={corner}/>);
          }
    
          row++;
          rowCount = 0;
          y += tileHeight - 10.5;
          x = -tileHalfHeight - (rows[row] - 1) * 0.5 * tileHeight;
        } else {
          x += tileHeight;
        }
      }
      return corners;
    }

    const generatePips = () => {
      let row = 0, rowCount = 0;
      let y = tileHalfWidth - (rows.length - 1) * 0.5 * tileWidth,
        x = -(rows[row] - 1) * 0.5 * tileHeight;
      let index = 0;
      let pip;
      return pipOrder.map(order => {
        pip = {
          roll: pips[order].roll,
          index: index++,
          top: y,
          left: x,
          order: order
        };
        const div = <Pip
          pip={pip}
          key={`pip-${order}`}
        />;
          
        if (++rowCount === rows[row]) {
          row++;
          rowCount = 0;
          y += tileWidth;
          x = - (rows[row] - 1) * 0.5 * tileHeight;
        } else {
          x += tileHeight;
        }

        return div;
      });
    };

    const generateTiles = () => {
      let row = 0, rowCount = 0;
      let y = tileHalfWidth - (rows.length - 1) * 0.5 * tileWidth,
        x = -(rows[row] - 1) * 0.5 * tileHeight;
      let index = 0;
      return tileOrder.map(order => {
        const tile = Object.assign({},
          tiles[order],
          { index: index++, left: x, top: y});

        let div = <Tile
          key={`${tile.type}-${tile.card}`}
          tile={tile}
          />;
      
        if (++rowCount === rows[row]) {
          row++;
          rowCount = 0;
          y += tileWidth;
          x = - (rows[row] - 1) * 0.5 * tileHeight;
        } else {
          x += tileHeight;
        }
      
        return div;
      });
    };

    const generateBorders = () => {
      const sides = 6;
      let side = -1;
      return borderOrder.map(order => {
        const border = borders[order];
        side++;
        let x =  + Math.sin(Math.PI - side / sides * 2. * Math.PI) * radius,
          y = Math.cos(Math.PI - side / sides * 2. * Math.PI) * radius;
        let prev = (order === 0) ? 6 : order;
        const file = `borders-${order+1}.${prev}.png`;
        return <div
          key={`border-${order}`}
          className="Border"
          border={border}
          style={{
            width: `${borderImageWidth}px`,
            height: `${borderImageHeight}px`,
            top: `${y}px`,
            left: `${x}px`,
            transform: `rotate(${side*(360/sides)}deg) translate(${borderOffsetX}px, ${borderOffsetY}px) scale(-1, -1)`,
            backgroundImage: `url(${assetsPath}/gfx/${file} )`
          }}
        />;
      });
    };

    setPipElements(generatePips());
    setBorderElements(generateBorders());
    setTileElements(generateTiles());
    setCornerElements(generateCorners());
    setRoadElements(generateRoads());

    setGenerated(signature);
  }, [
    signature, generated,
    setPipElements, setBorderElements, setTileElements,
    setCornerElements, setRoadElements,
    borderOrder, borders, pipOrder, pips, tileOrder, tiles
  ]);

  useEffect(() => {
    if (!turn) {
      return;
    }
  
    let nodes = document.querySelectorAll('.Active');
    for (let i = 0; i < nodes.length; i++) {
      nodes[i].classList.remove('Active');
    }
    if (turn.roll) {
      nodes = document.querySelectorAll(`.Pip[data-roll="${turn.roll}"]`);
      for (let i = 0; i < nodes.length; i++) {
        const index = nodes[i].getAttribute('data-index');
        if (index !== null) {
          const tile = document.querySelector(`.Tile[data-index="${index}"]`);
          if (tile) {
            tile.classList.add('Active');
          }
        }
        nodes[i].classList.add('Active');
      }
    }
  }, [ turn ]);

  useEffect(() => {
    if (!placements) {
      return;
    }
  
    /* Set color and type based on placement data from the server */
    placements.corners.forEach((corner, index) => {
      const el = document.querySelector(`.Corner[data-index="${index}"]`);
      if (!el) {
        return;
      }
      if (!corner.color) {
        el.removeAttribute('data-color');
        el.removeAttribute('data-type');
      } else {
        el.setAttribute('data-color', corner.color);
        el.setAttribute('data-type', corner.type);
      }
    });
    placements.roads.forEach((road, index) => {
      const el = document.querySelector(`.Road[data-index="${index}"]`);
      if (!el) {
        return;
      }
      if (!road.color) {
        el.removeAttribute('data-color');
      } else {
        if (road.longestRoad) {
          if (road.longestRoad === longestRoadLength) {
            el.classList.add('LongestRoad');
          } else {
            el.classList.remove('LongestRoad');
          }
          el.setAttribute('data-longest', road.longestRoad);
        } else {
          el.removeAttribute('data-longest');
        }
        el.setAttribute('data-color', road.color);
      }
    });
    /* Clear all 'Option' targets */
    let nodes = document.querySelectorAll(`.Option`);
    for (let i = 0; i < nodes.length; i++) {
      nodes[i].classList.remove('Option');
    }
  
    /* Add 'Option' based on turn.limits */
    if (turn && turn.limits) {
      if (turn.limits['roads']) {
        turn.limits['roads'].forEach(index => {
          const el = document.querySelector(`.Road[data-index="${index}"]`);
          if (!el) {
            return;
          }
          el.classList.add('Option');
        });
      }
      if (turn.limits['corners']) {
        turn.limits['corners'].forEach(index => {
          const el = document.querySelector(`.Corner[data-index="${index}"]`);
          if (!el) {
            return;
          }
          el.classList.add('Option');
        });
      }
      if (turn.limits['tiles']) {
        turn.limits['tiles'].forEach(index => {
          const el = document.querySelector(`.Tile[data-index="${index}"]`);
          if (!el) {
            return;
          }
          el.classList.add('Option');
        });
      }
      if (turn.limits['pips']) {
        turn.limits['pips'].forEach(index => {
          const el = document.querySelector(`.Pip[data-index="${index}"]`);
          if (!el) {
            return;
          }
          el.classList.add('Option');
        });
      }
    }
  }, [ placements, turn]);
  
  useEffect(() => {
    let nodes = document.querySelectorAll(`.Pip.Robber`);
    for (let i = 0; i < nodes.length; i++) {
      nodes[i].classList.remove('Robber');
      [ 'Robert', 'Roberta', 'Velocirobber' ].forEach(robberName => 
        nodes[i].classList.remove(robberName)
      );
    }

    if (robber !== undefined) {
      const el = document.querySelector(`.Pip[data-index="${robber}"]`);
      if (el) {
        el.classList.add('Robber');
        el.classList.add(robberName);
      } 
    }
  }, [ robber, robberName ]);

  const canAction = (action) => {
    return (turn && Array.isArray(turn.actions) && turn.actions.indexOf(action) !== -1);
  };

  const canRoad = (canAction('place-road')
    && turn.color === color 
    && (state === 'initial-placement' || state === 'normal'));

  const canCorner = ((canAction('place-settlement') || canAction('place-city'))
    && turn.color === color 
    && (state === 'initial-placement' || state === 'normal'));
  
  const canPip = (canAction('place-robber') 
    && turn.color === color 
    && (state === 'initial-placement' || state === 'normal'));
            
  return (
    <div className="Board" ref={board}>
      <div className="BoardBox">
        <div className="Borders" disabled>
          { borderElements }
        </div>
        <div className="Tiles" disabled>
          { tileElements }
        </div>
        <div className="Pips" disabled={!canPip}>
          { pipElements }
        </div>
        <div className="Corners" disabled={!canCorner}>
          { cornerElements }
        </div>
        <div className="Roads" disabled={!canRoad}>
          { roadElements }
        </div>
    </div>
    </div>
  );
};

export { Board };