package main

import (
  "slices"
)

func compass(near Position, offset int) []Position {
  return []Position{
    Position{near.X, near.Y - offset},
    Position{near.X, near.Y + offset},
    Position{near.X + offset, near.Y},
    Position{near.X - offset, near.Y},
  }
}

func (game *Game) Inbounds(pos Position, offset int) bool {
  return pos.X >= offset &&
    pos.X < game.Width - offset &&
    pos.Y >= offset &&
    pos.Y < game.Height - offset
}

func (game *Game) Occupied(pos Position) bool {
  _, is_enemy := game.Enemies[pos]
  is_player := pos == game.Player.Pos

  // Inbounds comes first to prevent accessing level with bad x,y
  return !game.Inbounds(pos, 1) ||
      game.Level[pos.Y][pos.X] == WALL ||
      is_enemy ||
      is_player
}

func (game *Game) FillMap(target Map, setting rune) {
  for y := 0 ; y < game.Height; y++ {
    target[y] = slices.Repeat([]rune{setting}, game.Width)
  }
}

func (game *Game) Neighbors(near Position) []Position {
  result := make([]Position, 0, 4)
  points := compass(near, 2)

  for _, pos := range points {
    if game.Inbounds(pos, 0) {
      result = append(result, pos)
    }
  }

  return result
}

func (game *Game) NewMap() {
  game.FillMap(game.Level, '#')
}