local utils = require "lib.utils.utils"

--- @class CharacterGrid
--- @field __grid {string: Id|nil}
local grid = {}
grid.__index = grid

local function encode(x, y)
    return tostring(x) .. ";" .. tostring(y)
end

--- Adds a character id to the grid
--- @param id Id
function grid:add(id)
    local character = Tree.level.characters[id]
    if not character then return end

    local centerX, centerY = math.floor(character.logic.mapLogic.position.x + 0.5),
        math.floor(character.logic.mapLogic.position.y + 0.5)
    local sizeX, sizeY     = character.logic.mapLogic.size.x, character.logic.mapLogic.size.y

    for y = centerY, centerY + sizeY - 1 do
        for x = centerX, centerX + sizeX - 1 do
            self.__grid[encode(x, y)] = character.id
        end
    end
end

--- @param x integer
--- @param y integer
function grid:get(x, y)
    return self.__grid[encode(x, y)]
end

--- clears the grid
function grid:reset()
    self.__grid = {}
end

--- Generates an empty grid
--- @return CharacterGrid
local function new()
    return setmetatable({
        __grid = {}
    }, grid)
end

return { new = new }