main = require('main')
function gravity(object, dt)
    if object.bools.isAirborne == true then
        object.physics.airtime = object.physics.airtime + dt
    end
    if clearanceCheck(object, dt) == "ground" then
        object.y = ground.y - (object.height + 1)
        object.physics.velocityY = 0
        object.physics.airtime = 0
        object.bools.isAirborne = false
    elseif object.y ~= ground.y - (object.height + 1) then
        object.bools.isAirborne = true
    end
    object.physics.gravity = 4.91*object.physics.airtime
    if object.physics.velocityY + object.physics.gravity > object.physics.terminalVelocity then
        object.physics.velocityY = object.physics.terminalVelocity
    else
        object.physics.velocityY = object.physics.velocityY + object.physics.gravity
    end

end

function mouvement(object, dt)
    object.y = object.y + object.physics.velocityY
    object.x = object.x + object.physics.velocityX
    if object.bools.isWalking == false and object.physics.velocityX ~=0 then
        object.physics.velocityX = 0
    end
    if not object.bools.isRunning and math.abs(object.physics.velocityX) > object.attributes.maxRunningSpeed + 0.1 then 
        if object.physics.velocityX > 0 then
            object.physics.velocityX = object.attributes.maxRunningSpeed
        else
            object.physics.velocityX = object.attributes.maxRunningSpeed * -1
        end
    end
end

function clearanceCheck(object, dt)
    if ground.y <= object.y + object.height + object.physics.velocityY + 1 then
        return "ground"
    else
        return "GTG"
    end
end