import React from 'react';

class Grid extends React.Component {
  constructor() {
    super();

    this.state = {
      row: 16,
      col: 16,
      mines: 51,
      set: [],
    };

    this.state.grid = this.numberingGrid(
      this.createGrid(
        this.shuffleSet(
          this.createSet(
            this.state.set,
          ),
        ),
      ),
    );
  }

  createSet(obj) {
    for (let i = 0, j = this.state.row * this.state.col; i < j; i++) {
      obj.push(0 < this.state.mines ? 'm' : 'w');
      this.state.mines--;
    }

    return obj;
  }

  shuffleSet(obj) {
    return obj.sort(function() {
      return Math.round(Math.random()) - .5;
    });
  }

  createGrid(obj) {
    let grid = [[]],
      row = 0,
      col = 0;

    for (let i = 0, j = obj.length; i < j; i++) {
      grid[row][col] = obj[i];

      if (15 === col && 15 !== row) {
        row++;
        col = 0;
        grid.push([]);
      } else {
        col++;
      }
    }

    return grid;
  }

  isThereMine(obj, row, col) {
    return 'm' === obj?.[row]?.[col] ? 1 : 0;
  }

  numberingGrid(obj) {
    let nbr = 0;

    for (let i = 0; i < this.state.row; i++) {
      for (let j = 0; j < this.state.col; j++) {
        if ('w' === obj[i][j]) {
          nbr = 0;

          nbr += this.isThereMine(obj, i - 1, j);
          nbr += this.isThereMine(obj, i - 1, j - 1);
          nbr += this.isThereMine(obj, i - 1, j + 1);
          nbr += this.isThereMine(obj, i, j - 1);
          nbr += this.isThereMine(obj, i, j + 1);
          nbr += this.isThereMine(obj, i + 1, j);
          nbr += this.isThereMine(obj, i + 1, j + 1);
          nbr += this.isThereMine(obj, i + 1, j - 1);

          obj[i][j] = nbr;
        }
      }
    }

    return obj;
  }
}

export default Grid;