Bullet Projectile

local RunService = game:GetService("RunService")
local ReplicatedStorage = game:GetService("ReplicatedStorage")

local Signal = require(ReplicatedStorage.Libs.Signal)
local Trove = require(ReplicatedStorage.Libs.Trove)

local IS_CLIENT = RunService:IsClient()
local DEFAULT_SPEED = 50
local DEFAULT_PARAMS = RaycastParams.new()

local Bullet = {}
Bullet.__index = Bullet

function Bullet.new(projectileProperties)
    local self = setmetatable({}, Bullet)
    self.Properties = projectileProperties
    self.Position = projectileProperties.StartPosition
    self.Params = projectileProperties.Params or DEFAULT_PARAMS
    self.Speed = projectileProperties.Speed or DEFAULT_SPEED

    if IS_CLIENT then
        self.Instance = script.BulletTemplate:Clone()
        self.Instance.Name = "sigma"
        self.Instance.Position = self.Position
        self.Instance.Parent = workspace
    end

    self.Hit = Signal.new()
    self.Destroyed = Signal.new()
    self.Destroyed:Connect(function()
        if self.Instance then
            self.Instance:Destroy()
        end
    end)

    local distance =
        (projectileProperties.StartPosition
        - projectileProperties.TargetPosition).Magnitude

    self.Lifetime = distance / self.Speed

    return self
end

function Bullet:Update(_deltaTime)
    local timePassed = workspace:GetServerTimeNow() - self.Properties.StartTime
    local timePercentage = timePassed / self.Lifetime
    if timePercentage > 1 then
        self.Destroyed:Fire()
        return
    end

    local lastPosition = self.Position
    local currentPosition = self.Properties.StartPosition:Lerp(self.Properties.TargetPosition, timePercentage)
    local direction = currentPosition - lastPosition
    local result = workspace:Raycast(
        lastPosition,
        direction,
        self.Params
    )

    if result then
        self.Position = result.Position
        self.Hit:Fire(result.Instance)
        self.Destroyed:Fire()
        return
    end

    self.Position = currentPosition

    if self.Instance then
        self.Instance.Position = self.Position
    end
end

return Bullet