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

local Gun = require(ReplicatedStorage.Modules.Client.Controllers.GunController)
local BulletController = require(ReplicatedStorage.Modules.Client.Controllers.BulletController)
local SpreadUtil = require(ReplicatedStorage.Modules.Shared.SpreadUtil)
local LocalPlayer = Players.LocalPlayer

local fov = 120
local maxDist = 2000
local wallcheck = true

local target, targetPart

local sg = LocalPlayer.PlayerGui:FindFirstChild("ScreenGui")
if sg and sg:FindFirstChild("LocalScript") then sg.LocalScript:Destroy() end

local CameraPOV
pcall(function()
	CameraPOV = require(ReplicatedStorage.Modules.Client.CameraPOV)
end)

local fovCircle = Drawing.new("Circle")
fovCircle.Filled = false
fovCircle.Thickness = 1
fovCircle.Color = Color3.new(1, 1, 1)

local wallParams = RaycastParams.new()
wallParams.FilterType = Enum.RaycastFilterType.Exclude
wallParams.IgnoreWater = true

local discharge = BulletController.Discharge
BulletController.Discharge = function(self, weapon, eyePos, fireDir, muzzleCf, ...)
	if Gun.FireHeld and target then
		local origin = muzzleCf and muzzleCf.Position or eyePos or Gun:GetMuzzleWorldCFrame().Position
		fireDir = (target - origin).Unit
		local ret = { discharge(self, weapon, eyePos, fireDir, muzzleCf, ...) }
		return table.unpack(ret)
	end
	return discharge(self, weapon, eyePos, fireDir, muzzleCf, ...)
end

local randomCone = SpreadUtil.RandomConeDirection
SpreadUtil.RandomConeDirection = function(dir, ...)
	if Gun.FireHeld and target then return dir end
	return randomCone(dir, ...)
end

RunService.PreRender:Connect(function()
	target, targetPart = nil, nil

	local camera = workspace.CurrentCamera
	local center = camera.ViewportSize / 2
	fovCircle.Position = center
	fovCircle.Radius = fov
	fovCircle.Visible = true

	local eyePos = CameraPOV and CameraPOV.GetEyePosition and CameraPOV.GetEyePosition() or camera.CFrame.Position
	local mercs = workspace:FindFirstChild("MercPlayers")
	if not mercs then return end

	local bestHead, bestDist = nil, fov

	for _, player in Players:GetPlayers() do
		if player ~= LocalPlayer then
			local hitboxes = mercs:FindFirstChild("MercHitboxes_" .. player.Name)
			if hitboxes and not hitboxes:GetAttribute("Dead") then
				local head = hitboxes:FindFirstChild("Head")
				if head and (head.Position - eyePos).Magnitude <= maxDist then
					local aim = head.Position + Vector3.new(0, head.Size.Y * 0.15, 0)
					local clear = true

					if wallcheck then
						wallParams.FilterDescendantsInstances = { LocalPlayer.Character, camera, mercs }
						clear = workspace:Raycast(eyePos, aim - eyePos, wallParams) == nil
					end

					if clear then
						local scr, vis = camera:WorldToViewportPoint(head.Position)
						if vis and scr.Z > 0 then
							local px = (Vector2.new(scr.X, scr.Y) - center).Magnitude
							if px < bestDist then
								bestDist = px
								bestHead = head
							end
						end
					end
				end
			end
		end
	end

	if bestHead then
		targetPart = bestHead
		target = bestHead.Position + Vector3.new(0, bestHead.Size.Y * 0.15, 0)
	end
end)