diff --git a/choco.lua b/choco.lua
index 24fb159..a632e7f 100644
--- a/choco.lua
+++ b/choco.lua
@@ -19,9 +19,9 @@ end
 
 ressources = 
 {
-  fruits = 
+  fruit = 
   {
-    quantity = 5,
+    quantity = 55,
     sprite = 33,
     x = 70
   },
@@ -33,8 +33,16 @@ ressources =
   },
   jam =
   {
-    quantity = 0,
+    quantity = 100,
     sprite = 34,
     x = 100
   }
-}
\ No newline at end of file
+}
+
+function draw_ressource_bar()
+  rectfill(0, 0, 127, 7, 1)
+  for _,res in pairs(ressources) do
+    spr(res.sprite, res.x, 0)
+    print(res.quantity, res.x + 8, 1, 6)
+  end
+end
\ No newline at end of file
diff --git a/world.lua b/world.lua
index 34e85be..66e4fa3 100644
--- a/world.lua
+++ b/world.lua
@@ -8,7 +8,8 @@ function world_init()
 end
 
 function world_update()
-  if (btnp(5)) compute_effect_array(worldtiles)
+    if (btnp(4)) build(3,2,buildings.jam_workshop)
+    if (btnp(5)) compute_effect_array(worldtiles)
 end
 
 function world_draw()
@@ -16,37 +17,46 @@ function world_draw()
 end
 
 
-buildings = {
+buildings = 
+{
   jam_workshop = 
   {
     sprite = 1,
-    inputs = {
-      {fruit = 2}
+    inputs = 
+    {
+        {
+            type = "fruit",
+            quantity = 2
+        }
     },
-    outputs = {jam = 3}
+    outputs = 
+    {
+        {
+            type = "jam",
+            quantity = 3
+        }
+    }
   },
   city = 
   {
     sprite = 5,
-    inputs = {jam = 1},
-    outputs = {money = 1}
+    inputs = 
+    {
+        {
+            type = "jam",
+            quantity = 1
+        }
+    },
+    outputs = 
+    {
+        {
+            type = "money",
+            quantity = 2
+        }
+    }
   },
 }
 
-
-function draw_ressource_bar()
-  rectfill(0, 0, 127, 7, 1)
-  for _,res in pairs(ressources) do
-    spr(res.sprite, res.x, 0)
-    print(res.quantity, res.x + 8, 1, 6)
-  end
-end
-
-          
-function updatecycle()
-
-end
-
 function compute_effect_array(array)
   for obj in all(array) do
     obj.compute_effet(obj)
@@ -59,8 +69,6 @@ function draw_array(array)
   end
 end
 
-
-
 function new_worldtile(x, y, building)
     local worldtile = {}
     worldtile.x = x
@@ -70,8 +78,17 @@ function new_worldtile(x, y, building)
       spr(worldtile.building.sprite,worldtile.x*2*8,8+worldtile.y*2*8, 2, 2)
     end
     worldtile.compute_effet = function(this)
+        has_ressource = true
         for _,input in pairs(worldtile.building.inputs) do
-          --input.
+          if (ressources[input.type].quantity < input.quantity) has_ressource = false
+        end
+        if (has_ressource) then
+            for _,input in pairs(worldtile.building.inputs) do
+                ressources[input.type].quantity-=input.quantity
+            end
+            for _,output in pairs(worldtile.building.outputs) do
+                ressources[output.type].quantity+=output.quantity
+            end
         end
     end
     return worldtile
@@ -90,4 +107,12 @@ end
 function replace(worldtile, building)
     destroy(worldtile)
     return build(worldtile.x, worldtile.y, building)
-end
\ No newline at end of file
+end
+
+function get_worldtile(x,y)
+    for _,tile in pairs(worldtiles) do
+        if (tile.x == x and tile.y == y) then 
+            return tile
+        end
+    end
+end