import _ from 'lodash';
import Tile, { Feature, Direction } from '../Tile/Tile';
import TileOnBoard, { Attachment } from '../Tile/TileOnBoard';

const { Road, Town, Grass } = Feature;
const { North, East, South, West } = Direction;

export default class Board {
  tiles: TileOnBoard[];

  constructor(tiles?: TileOnBoard[]) {
    if (tiles) this.tiles = tiles;
    else this.tiles = [new TileOnBoard(Road, [Town, Road, Grass, Road])]
  }

  print() {
    const maxY = _.maxBy(this.tiles, 'position.y').position.y;
    const minY = _.minBy(this.tiles, 'position.y').position.y;

    const maxX = _.maxBy(this.tiles, 'position.x').position.x;
    const minX = _.minBy(this.tiles, 'position.x').position.x;

    _.range(maxY, minY - 1, -1)
      .map((y: number) => {
        const rowTiles = _.filter(this.tiles, { position: { y } });

        console.log(
          _.range(minX, maxX + 1)
          .map((x: number) => {
            const tile = _.find(rowTiles, { position: { x, y } });
            if (!tile) return '   ';
            return  ` ${tile.getSide(North)} `;
          })
          .join('|')
        );

        console.log(
          _.range(minX, maxX + 1)
          .map((x: number) => {
            const tile = _.find(rowTiles, { position: { x, y } });
            if (!tile) return '   ';
            return  `${tile.getSide(West)}${tile.center}${tile.getSide(East)}`;
          })
          .join('|')
        );

        console.log(
          _.range(minX, maxX + 1)
          .map((x: number) => {
            const tile = _.find(rowTiles, { position: { x, y } });
            if (!tile) return '   ';
            return  ` ${tile.getSide(South)} `;
          })
          .join('|')
        );
      });
  }

  getAttachments(tile: Tile): Attachment[] {
    return _
      .flatten(this.tiles.map(attachTo => attachTo.getAttachments(tile)))
      .filter((attachment: Attachment) => this.isLegalAttachment(attachment));
  }

  previewAttachment(attachment: Attachment) {
    console.log(attachment);
    const previewBoard = _.cloneDeep(this);
    previewBoard.attach(attachment);
    previewBoard.print();
  }

  isLegalAttachment(attachment: Attachment) {
    const { tile, side, attachTo, orientation } = attachment;

    const xIncrement = {
      [East]: 1,
      [West]: -1,
    };

    const yIncrement = {
      [North]: 1,
      [South]: -1,
    };

    const position = {
      x: attachTo.position.x + (xIncrement[side] || 0),
      y: attachTo.position.y + (yIncrement[side] || 0),
    };

    const isBusy = _.find(this.tiles, { position });
    if (isBusy) return false;

    // TODO: compute this array at runtime
    const neighborIncrements = [
      { x: 0, y: -1, side: 0 },
      { x: -1, y: 0, side: 1 },
      { x: 0, y: 1, side: 2 },
      { x: 1, y: 0, side: 3 },
    ];

    return _.every(_.map(neighborIncrements, ({ x, y, side }) => {
      const neighbor = _.find(this.tiles, {
        position: {
          x: position.x + x,
          y: position.y + y,
        }
      });
      if (!neighbor) return true;
      if (neighbor.getSide(side) !== tile.getSide(side - orientation + 2)) return false;
      return true;
    }));
  }

  attach(attachment: Attachment) {
    const { tile, attachTo, side, orientation } = attachment;

    const xIncrement = {
      [East]: 1,
      [West]: -1,
    };

    const yIncrement = {
      [North]: 1,
      [South]: -1,
    };

    const tileOnBoard = new TileOnBoard(
      tile.center,
      tile.sides,
      tile.shield,
      {
        x: attachTo.position.x + (xIncrement[side] || 0),
        y: attachTo.position.y + (yIncrement[side] || 0),
      },
      orientation,
    );

    this.tiles.push(tileOnBoard);
  }
}