'use strict'

const _utils = require('./_utils')

function getColumns(game) { return game.board }

function getRows(game) { return _utils.inverse2D(game.board) }

function getNWDiagonals(game) {
  return _utils.range(game.width + game.height - 1).map(edge => {
    // taking top and left edge
    let i = edge < game.width ? edge : 0
    let j = edge < game.width ? 0 : edge - game.width + 1
    const arr = []

    while(i < game.width && j < game.height) {
      arr.push(game.board[i][j])
      i++, j++
    }
    return arr
  })
}

function getNEDiagonals(game) {
  return _utils.range(game.width + game.height - 1).map(edge => {
    // taking top and right edge
    let i = edge < game.width ? edge : game.width - 1
    let j = edge < game.width ? 0 : edge - game.width + 1
    const arr = []

    while(i >= 0 && j < game.height) {
      arr.push(game.board[i][j])
      i--, j++
    }
    return arr
  })
}

function getItems(game) {
  return getColumns(game).reduce((mem, column) => mem.concat(column), [])
}

module.exports = {
  getColumns,
  getRows,
  getItems,
  getNWDiagonals,
  getNEDiagonals,
}