--by pavetr.top/ds
local cameraEnabled = false
local headCameraEnabled = false
local ChestCameraEnabled = false
local cameraMode = "head"
local headCamOffset = Vector(10, 2, 8)
local chestCamOffset = Vector(2, 5, -8)
local headCamFOV = 0
local ChestCamFOV = 0

local offsetLimits = {
    min = Vector(-20, -20, -20),
    max = Vector(20, 20, 20)
}

local function ClampOffset(offset)
    return Vector(
        math.Clamp(offset.x, offsetLimits.min.x, offsetLimits.max.x),
        math.Clamp(offset.y, offsetLimits.min.y, offsetLimits.max.y),
        math.Clamp(offset.z, offsetLimits.min.z, offsetLimits.max.z)
    )
end

hook.Add("CalcView", "ChestCamera_AttachToPlayer", function(ply, pos, angles, fov)
    if cameraEnabled then
        local view = {}
        local attachmentPoint = cameraMode == "head" and "eyes" or "chest"
        local offset = cameraMode == "head" and headCamOffset or chestCamOffset

        local attachmentID = ply:LookupAttachment(attachmentPoint)
        if attachmentID then
            local attachPos = ply:GetAttachment(attachmentID).Pos
            
            local desiredCamPos = attachPos + angles:Forward() * -offset.z + angles:Right() * offset.x + angles:Up() * offset.y

            angles:RotateAroundAxis(angles:Right(), headCamFOV)
            angles:RotateAroundAxis(angles:Right(), ChestCamFOV)

            local trace = util.TraceLine({
                start = attachPos,
                endpos = desiredCamPos,
                filter = ply
            })

            if trace.Hit then
                view.origin = trace.HitPos + trace.HitNormal * 5
            else
                view.origin = desiredCamPos
            end

            view.angles = angles
            view.fov = fov
            view.drawviewer = true
            return view
        end
    end
end)

if exechack_api then
exechack_api.CalcViewOverlayHook = function(ply, pos, angles, fov)
    if cameraEnabled then
        local view = {}
        local attachmentPoint = cameraMode == "head" and "eyes" or "chest"
        local offset = cameraMode == "head" and headCamOffset or chestCamOffset

        local attachmentID = ply:LookupAttachment(attachmentPoint)
        if attachmentID then
            local attachPos = ply:GetAttachment(attachmentID).Pos
            
            local desiredCamPos = attachPos + angles:Forward() * -offset.z + angles:Right() * offset.x + angles:Up() * offset.y

            angles:RotateAroundAxis(angles:Right(), headCamFOV)
            angles:RotateAroundAxis(angles:Right(), ChestCamFOV)

            local trace = util.TraceLine({
                start = attachPos,
                endpos = desiredCamPos,
                filter = ply
            })

            if trace.Hit then
                view.origin = trace.HitPos + trace.HitNormal * 5
            else
                view.origin = desiredCamPos
            end

            view.angles = angles
            view.fov = fov
            view.drawviewer = true
            return view
        end
    end
end
end

    local function CreateHeadCameraSettings(panel)
        panel:ClearControls()
        
        panel:Help("Head Camera Settings")
        panel:CheckBox("Enable Head Camera", "headcamera_enabled")

        local offsetX = panel:NumSlider("Offset X", "headcamera_offset_x", -20, 20, 2)
        local offsetY = panel:NumSlider("Offset Y", "headcamera_offset_y", -20, 20, 2)
        local offsetZ = panel:NumSlider("Offset Z", "headcamera_offset_z", 0, 50, 2)
        
        local verticalAngle = panel:NumSlider("Vertical Angle (FOV)", "headcamera_fov", -30, 30, 2)
        verticalAngle:SetValue(headCamFOV)

        local resetButton = panel:Button("Reset to Default", "headcamera_reset")

        offsetX:SetValue(headCamOffset.x)
        offsetY:SetValue(headCamOffset.y)
        offsetZ:SetValue(headCamOffset.z)

        resetButton.DoClick = function()
            headCamOffset = Vector(10, 2, 8)
            headCamFOV = 0
            offsetX:SetValue(headCamOffset.x)
            offsetY:SetValue(headCamOffset.y)
            offsetZ:SetValue(headCamOffset.z)
            verticalAngle:SetValue(headCamFOV)
        end
    end

    local function CreateChestCameraSettings(panel)
        panel:ClearControls()
        
        panel:Help("Chest Camera Settings")
        panel:CheckBox("Enable Chest Camera", "Chestcamera_enabled")

        local offsetX = panel:NumSlider("Offset X", "chestcamera_offset_x", -20, 20, 2)
        local offsetY = panel:NumSlider("Offset Y", "chestcamera_offset_y", -20, 20, 2)
        local offsetZ = panel:NumSlider("Offset Z", "chestcamera_offset_z", -50, 50, 2)

        local verticalAngle = panel:NumSlider("Vertical Angle (FOV)", "chestcamera_fov", -30, 30, 2)
        verticalAngle:SetValue(ChestCamFOV)

        local resetButton = panel:Button("Reset to Default", "chestcamera_reset")

        offsetX:SetValue(chestCamOffset.x)
        offsetY:SetValue(chestCamOffset.y)
        offsetZ:SetValue(chestCamOffset.z)

        resetButton.DoClick = function()
            chestCamOffset = Vector(2, 5, -8)
            ChestCamFOV = 0
            offsetX:SetValue(chestCamOffset.x)
            offsetY:SetValue(chestCamOffset.y)
            offsetZ:SetValue(chestCamOffset.z)
            verticalAngle:SetValue(ChestCamFOV)
        end
    end

    local function UpdateCameraSettings()
        cameraEnabled = headCameraEnabled or ChestCameraEnabled

        if headCameraEnabled then
            cameraMode = "head"
            headCamOffset.x = ClampOffset(Vector(GetConVar("headcamera_offset_x"):GetFloat(), 0, 0)).x
            headCamOffset.y = ClampOffset(Vector(0, GetConVar("headcamera_offset_y"):GetFloat(), 0)).y
            headCamOffset.z = ClampOffset(Vector(0, 0, GetConVar("headcamera_offset_z"):GetFloat())).z
            headCamFOV = GetConVar("headcamera_fov"):GetFloat()
        elseif ChestCameraEnabled then
            cameraMode = "chest"
            chestCamOffset.x = ClampOffset(Vector(GetConVar("chestcamera_offset_x"):GetFloat(), 0, 0)).x
            chestCamOffset.y = ClampOffset(Vector(0, GetConVar("chestcamera_offset_y"):GetFloat(), 0)).y
            chestCamOffset.z = ClampOffset(Vector(0, 0, GetConVar("chestcamera_offset_z"):GetFloat())).z
            ChestCamFOV = GetConVar("chestcamera_fov"):GetFloat()
        end
    end

    CreateConVar("Chestcamera_enabled", "0", FCVAR_ARCHIVE, "Enable or disable Chest camera")
    CreateConVar("headcamera_enabled", "0", FCVAR_ARCHIVE, "Enable or disable head camera")
    CreateConVar("headcamera_offset_x", "10", FCVAR_ARCHIVE, "Head camera offset on X axis")
    CreateConVar("headcamera_offset_y", "2", FCVAR_ARCHIVE, "Head camera offset on Y axis")
    CreateConVar("headcamera_offset_z", "8", FCVAR_ARCHIVE, "Head camera offset on Z axis")
    CreateConVar("chestcamera_offset_x", "2", FCVAR_ARCHIVE, "Chest camera offset on X axis")
    CreateConVar("chestcamera_offset_y", "5", FCVAR_ARCHIVE, "Chest camera offset on Y axis")
    CreateConVar("chestcamera_offset_z", "-8", FCVAR_ARCHIVE, "Chest camera offset on Z axis")
    CreateConVar("headcamera_fov", "0", FCVAR_ARCHIVE, "Vertical angle adjustment for head camera")
    CreateConVar("chestcamera_fov", "0", FCVAR_ARCHIVE, "Vertical angle adjustment for Chest camera")

    cvars.AddChangeCallback("headcamera_enabled", function(convar, oldValue, newValue)
        headCameraEnabled = tobool(newValue)
        UpdateCameraSettings()
    end)

    cvars.AddChangeCallback("Chestcamera_enabled", function(convar, oldValue, newValue)
        ChestCameraEnabled = tobool(newValue)
        UpdateCameraSettings()
    end)

    cvars.AddChangeCallback("headcamera_offset_x", function(convar, oldValue, newValue)
        headCamOffset.x = ClampOffset(Vector(newValue, 0, 0)).x
    end)

    cvars.AddChangeCallback("headcamera_offset_y", function(convar, oldValue, newValue)
        headCamOffset.y = ClampOffset(Vector(0, newValue, 0)).y
    end)

    cvars.AddChangeCallback("headcamera_offset_z", function(convar, oldValue, newValue)
        headCamOffset.z = ClampOffset(Vector(0, 0, newValue)).z
    end)

    cvars.AddChangeCallback("chestcamera_offset_x", function(convar, oldValue, newValue)
        chestCamOffset.x = ClampOffset(Vector(newValue, 0, 0)).x
    end)

    cvars.AddChangeCallback("chestcamera_offset_y", function(convar, oldValue, newValue)
        chestCamOffset.y = ClampOffset(Vector(0, newValue, 0)).y
    end)

    cvars.AddChangeCallback("chestcamera_offset_z", function(convar, oldValue, newValue)
        chestCamOffset.z = ClampOffset(Vector(0, 0, newValue)).z
    end)

    hook.Add("PopulateToolMenu", "ChestCamera_PopulateToolMenu", function()
        spawnmenu.AddToolMenuOption("Options", "Camera", "HeadCamera", "Head Camera", "", "", CreateHeadCameraSettings)
        spawnmenu.AddToolMenuOption("Options", "Camera", "ChestCamera", "Chest Camera", "", "", CreateChestCameraSettings)
    end)
RunConsoleCommand("spawnmenu_reload")