easylua = easylua or {} local e = easylua

function easylua.GetClosestToAim(ply)
    local aim = ply:GetAimVector()
    local eye = ply:EyePos()

    local dot_ents = {}
    for key, entity in pairs(ents.GetAll()) do
        if
            not entity:GetOwner():IsPlayer() and
            not entity:GetParent():IsPlayer() and
            entity ~= ply and
            entity:EntIndex() ~= 0 and
            entity:GetClass() ~= "env_sprite"
        then
            local pos = entity:LocalToWorld(entity:OBBCenter())
            table.insert(dot_ents, {
                    entity = entity,
                    dot = (math.Clamp(-aim:Dot((eye - pos):Normalize()), 0, 1) ^ 10) / (eye:Distance(pos) + 100)
                }
            )
        end
    end

    table.SortByMember(dot_ents, "dot", function(a,b) return a < b end)

    return dot_ents[1].entity or NULL
end

function easylua.GetClosestFromPos(vec)

    local found = {}

    for key, entity in pairs(ents.GetAll()) do
        local distance = entity:GetPos():Distance(vec)
        if distance < 50 then
            table.insert(found, {entity = entity, distance = distance})
        end
    end

    table.SortByMember(found, "distance", function(a, b) return a > b end)

    return found[1].entity or NULL
end

function easylua.GetVars()
    return e._G_vars
end

function easylua.Start(ply)
    local trace = util.QuickTrace(ply:GetShootPos(), ply:GetAimVector() * 32000, {ply})
    local dis = e.GetClosestToAim(ply)
    local ent = not trace.Entity:IsWorld() and trace.Entity or dis


    local vars = {
        me = ply,

        trace = trace,
        tr = trace,

        there = trace.HitPos,
        here = ply:GetPos(),

        eyepos = trace.StartPos,
        eyeang = ply:EyeAngles(),

        aim = ply:GetAimVector(),

        wep = ply:GetActiveWeapon(),

        length = trace.StartPos:Distance(trace.HitPos),

        dis = dis,
        this = ent,
        phys = util.IsValidPhysicsObject(ent) and ent:GetPhysicsObject(),

        create = function(class)
            local mdl = "error.mdl"

            if IsEntity(class) and class:IsValid() then
                this = class
            elseif class:find(".mdl", nil, true) then
                mdl = class
                class = "prop_physics"

                this = ents.Create(class)
                this:SetModel(mdl)
            else
                this = ents.Create(class)
            end

            this:Spawn()
            this:SetPos(there + Vector(0,0,this:BoundingRadius() * 2))
            this:DropToFloor()
            this:PhysWake()

            undo.Create(class)
                undo.SetPlayer(me)
                undo.AddEntity(this)
            undo.Finish()
        end,

        copy = function(ent)
            ent = ent or this

            if SERVER then
                me:SendLua(Format("SetClipboardText('Entity(%s)')", this:EntIndex()))
            else
                SetClipboardText(Format("Entity(%s)", this:EntIndex()))
            end
        end,

        you = ent:IsPlayer() and ent or dis:IsPlayer() and dis or NULL
    }

    for key, value in pairs(vars) do
        _G[key] = value
    end

    e._G_vars = vars
end

function easylua.End()
    if e._G_vars then
        for key in pairs(e._G_vars) do
            if _G[key] then
                _G[key] = nil
            end
        end
    end
end

function easylua.RunLua(ply, code)

    easylua.Start(ply)
        local locals = ""

        for key in pairs(e.GetVars()) do
            locals = locals .. " local " .. key .. " = " .. key .. " "
        end

        local func = CompileString(locals .. " " .. code, tostring(ply))
        if func then
            local noerr, errormsg = pcall(func)

            if noerr == false then
                ErrorNoHalt("Script from '"..tostring(ply).."' errored: "..tostring(errormsg))
            end
        end
    easylua.End()
end

hook.Add("PreLuaDevRun", "easylua_luadev", function(_,_,ply)
    if IsValid(ply) and ply:IsPlayer() then
        easylua.Start(ply)
    end
end)

hook.Add("PostLuaDevRun", "easylua_luadev", function()
    easylua.End()
end)