local Rect = require "lib.simple_ui.rect"
local Constraints = require "lib.simple_ui.constraints"
local Vec3 = require "lib.utils.vec3"

--- @class UIElement
--- @field type string
--- @field key? any Must be convertible to string
--- @field parent? UIElement
--- @field constraints Constraints
--- @field offset Vec3 Положение левого верхнего угла элемента в экранных координатах {x, y}. Устанавливается родительским элементом.
--- @field size Vec3 Размеры элемента в экранных координатах {x, y}
--- @field build? fun(self)
local element = {}
element.__index = element
element.type = "Element"
element.constraints = Constraints {}
element.offset = Vec3 {}
element.size = Vec3 {}

--- "Constraints go down. Sizes go up. Parent sets position."
---
--- Karl Marx, probably.
function element:layout() end

function element:update(dt) end

function element:draw() end

--- @generic T : UIElement
--- @param values table
--- @param self T
--- @return T
function element.new(self, values)
    values.bounds = values.bounds or Rect {}
    values.transform = values.transform or love.math.newTransform()
    if values.child then values.child.parent = values end
    return setmetatable(values, self)
end

return element