controller.py

class TaskController:
    def __init__(self, model, view):
        self.model = model
        self.view  = view

        view.add_button.config(command=self.add_task)
        view.toggle_button.config(command=self.toggle_task)
        view.delete_button.config(command=self.delete_task)

        view.search_entry.bind("<KeyRelease>", lambda e: self.search_tasks())

        self.refresh()
    
    def add_task(self):
        text     = self.view.get_entry_text()
        due      = self.view.get_due_date()
        priority = self.view.priority_var.get()
        category = self.view.category_var.get()

        if text:
            self.model.add_task(text, due, priority, category)
            self.view.clear_entry()
            self.refresh()
        
    def toggle_task(self):
        index = self.view.get_selected_index()

        if index is not None:
            self.model.toggle_task(index)
            self.refresh()
        
    def delete_task(self):
        index = self.view.get_selected_index()

        if index is not None:
            self.model.delete_task(index)
            self.refresh()
    
    def search_tasks(self):
        query = self.view.get_search_query().lower()

        filtered = [task for task in self.model.tasks if query in task["text"].lower()]
        self.view.update_tasks(filtered)
    
    def refresh(self):
        self.model.sort_by_due()
        self.view.update_tasks(self.model.tasks)
        self.view.update_stats(self.model.tasks)