From f42177192648ff6517740ed2003aeef3b0a081a9 Mon Sep 17 00:00:00 2001
From: Ivan Yuriev <ivanyr44@gmail.com>
Date: Sun, 3 Aug 2025 03:39:42 +0300
Subject: [PATCH] refactoring

---
 camera.lua => lib/camera.lua |  0
 lib/grid.lua                 |  2 +-
 lib/level.lua                | 26 +++++++++++++++++++++++---
 lib/utils.lua                | 13 +++++++++++++
 main.lua                     |  2 +-
 5 files changed, 38 insertions(+), 5 deletions(-)
 rename camera.lua => lib/camera.lua (100%)

diff --git a/camera.lua b/lib/camera.lua
similarity index 100%
rename from camera.lua
rename to lib/camera.lua
diff --git a/lib/grid.lua b/lib/grid.lua
index 39dc63a..1c7f41b 100644
--- a/lib/grid.lua
+++ b/lib/grid.lua
@@ -1,4 +1,4 @@
-local utils = require("utils")
+local utils = require "lib/utils"
 
 ---Generates an empty grid
 ---@param width number
diff --git a/lib/level.lua b/lib/level.lua
index 3addb26..57234aa 100644
--- a/lib/level.lua
+++ b/lib/level.lua
@@ -1,5 +1,25 @@
+local utils = require "lib/utils"
+local camera = require "lib/camera"
+
+--- @class Level
+--- @field characters Character[]
+--- @field camera Camera
+local level = {}
+level.__index = level
+
 local function new()
-    return {
-        characters = {}
-    }
+    return setmetatable({
+        characters = {},
+        camera = camera.new()
+    }, level)
 end
+
+function level:update(dt)
+    utils.each(self.characters, function(el)
+        el:update(dt)
+    end)
+end
+
+return {
+    new = new
+}
diff --git a/lib/utils.lua b/lib/utils.lua
index 11587b4..3e3e4d8 100644
--- a/lib/utils.lua
+++ b/lib/utils.lua
@@ -16,8 +16,21 @@ function P.generateList(count, generator)
     return xs
 end
 
+--- Returns the sign of a number
+--- @param number number
+--- @return -1 | 0 | 1
 function P.sign(number)
     return (number > 0 and 1) or (number == 0 and 0) or -1
 end
 
+--- Applies a side effect for each element of a table
+--- @generic T
+--- @param table {[any] : T}
+--- @param fn fun(el: T): nil
+function P.each(table, fn)
+    for _, value in ipairs(table) do
+        fn(value)
+    end
+end
+
 return P
diff --git a/main.lua b/main.lua
index 6338f84..6ccc444 100644
--- a/main.lua
+++ b/main.lua
@@ -2,7 +2,7 @@
 
 require "character"
 
-local camera = require 'camera'
+local camera = require 'lib/camera'
 local Vec3 = require "lib/vec3"
 local tree = require "lib/tree"