add edit step + do recipe in main view, added carousel for recipe selection

frontend/views/recipes/recipe_manager.py

@@ -1,4 +1,5 @@
-from .recipe import V60, ESPRESSO, Recipe
+from typing import List
+from .recipe import V60, ESPRESSO, Recipe, Step, StepType
 
 class RecipeManager:
     def __init__(self):
@@ -7,6 +8,8 @@ class RecipeManager:
             ESPRESSO
         ]
         self.tmp_recipe = None
+        self.active_recipe: Recipe = None
+        self.current_recipe_step_id = 0
     
     def add_recipe(self, recipe):
         self.recipes.append(recipe)
@@ -21,6 +24,46 @@ class RecipeManager:
         return self.recipes.index(recipe)
     
     def get_recipe(self, recipe_id) -> Recipe:
-        if recipe_id == None:
+        if recipe_id is None:
             return self.tmp_recipe
-        return self.recipes[recipe_id]
+        return self.recipes[recipe_id]
+
+
+
+    def activate_recipe(self, recipe_id):
+        self.active_recipe = self.get_recipe(recipe_id)
+    
+    def deactivate_recipe(self):
+        self.active_recipe = None
+        self.current_recipe_step_id = 0
+    
+    def get_current_step(self) -> List[Step]:
+        steps = [None] * 3
+        if self.active_recipe is None:
+            return steps
+        if self.current_recipe_step_id > len(self.active_recipe.steps):
+            return steps
+        
+        if self.current_recipe_step_id > 0:
+            steps[0] = self.active_recipe.steps[self.current_recipe_step_id - 1]
+        if self.current_recipe_step_id < len(self.active_recipe.steps):
+            steps[1] = self.active_recipe.steps[self.current_recipe_step_id]
+        elif self.current_recipe_step_id == len(self.active_recipe.steps):
+            steps[1] = Step(StepType.SECTION, "Enjoy")
+        if self.current_recipe_step_id < len(self.active_recipe.steps) - 1:
+            steps[2] = self.active_recipe.steps[self.current_recipe_step_id + 1]
+        return steps
+    
+    def next_step(self) -> List[Step]:
+        if self.active_recipe is None:
+            return [None] * 3
+        self.current_recipe_step_id = min(self.current_recipe_step_id + 1, len(self.active_recipe.steps) + 1)
+        
+        return self.get_current_step()
+    
+    def previous_step(self) -> List[Step]:
+        if self.active_recipe is None:
+            return [None] * 3
+        self.current_recipe_step_id = max(0, self.current_recipe_step_id - 1)
+        
+        return self.get_current_step()