File Loading and Serialization

class FileLoader:
    """Base file loader for widget configuration."""
    
    def __init__(self):
        """Initialize file loader."""
    
    def load(self, path: str) -> "WidgetNamespace":
        """
        Load widget configuration from file.
        
        Parameters:
        - path (str): Path to configuration file
        
        Returns:
        WidgetNamespace containing loaded widgets
        """
    
    def save(self, namespace: "WidgetNamespace", path: str):
        """
        Save widget namespace to file.
        
        Parameters:
        - namespace (WidgetNamespace): Widgets to save
        - path (str): Output file path
        """

class YamlLoader(FileLoader):
    """YAML file loader for widget configuration."""
    
    def load(self, path: str) -> "WidgetNamespace":
        """
        Load widgets from YAML file.
        
        Parameters:
        - path (str): Path to YAML file
        
        Returns:
        WidgetNamespace with loaded widgets
        
        Requires:
        PyYAML package (pip install PyYAML)
        """

class JsonLoader(FileLoader):
    """JSON file loader for widget configuration."""
    
    def load(self, path: str) -> "WidgetNamespace":
        """
        Load widgets from JSON file.
        
        Parameters:
        - path (str): Path to JSON file
        
        Returns:
        WidgetNamespace with loaded widgets
        """

class WidgetNamespace:
    """Container for loaded widget configurations."""
    
    def __init__(self, widgets: dict[str, Widget] = None):
        """
        Create widget namespace.
        
        Parameters:
        - widgets (dict, optional): Named widget collection
        """
    
    def __getitem__(self, name: str) -> Widget:
        """Get widget by name."""
    
    def __setitem__(self, name: str, widget: Widget):
        """Set named widget."""
    
    def __contains__(self, name: str) -> bool:
        """Check if widget name exists."""
    
    @property
    def widgets(self) -> dict[str, Widget]:
        """Get all widgets as dictionary."""
    
    def add(self, name: str, widget: Widget):
        """Add named widget to namespace."""
    
    def remove(self, name: str) -> Widget:
        """Remove and return named widget."""
    
    def list_names(self) -> list[str]:
        """Get list of all widget names."""

class Serializer:
    """Widget serialization and deserialization system."""
    
    def __init__(self):
        """Initialize serializer."""
    
    def dump(self, widget: Widget) -> dict:
        """
        Serialize widget to dictionary.
        
        Parameters:
        - widget (Widget): Widget to serialize
        
        Returns:
        Dictionary representation of widget
        """
    
    def load(self, data: dict) -> Widget:
        """
        Deserialize widget from dictionary.
        
        Parameters:
        - data (dict): Serialized widget data
        
        Returns:
        Reconstructed widget instance
        """
    
    def dump_to_file(self, widget: Widget, filename: str):
        """Save widget to file."""
    
    def load_from_file(self, filename: str) -> Widget:
        """Load widget from file."""

# Global serializer instance
serializer: Serializer

# widgets.yaml
main_window:
  type: Window
  title: "My Application"
  width: 60
  height: 20
  widgets:
    - type: Label
      value: "[bold]Welcome to PyTermGUI"
    - type: Container
      widgets:
        - type: Button
          label: "Click Me"
          onclick: "handle_click"
        - type: InputField
          prompt: "Enter text:"
          value: ""

settings_dialog:
  type: Window  
  title: "Settings"
  width: 40
  height: 15
  widgets:
    - type: Checkbox
      label: "Enable sound"
      checked: true
    - type: Slider
      min_value: 0
      max_value: 100
      value: 50

{
  "main_form": {
    "type": "Container",
    "width": 50,
    "widgets": [
      {
        "type": "Label",
        "value": "[210 bold]User Registration"
      },
      {
        "type": "InputField", 
        "prompt": "Username:",
        "id": "username_field"
      },
      {
        "type": "InputField",
        "prompt": "Password:",
        "id": "password_field"
      },
      {
        "type": "Button",
        "label": "Register",
        "onclick": "handle_register"
      }
    ]
  }
}

import pytermgui as ptg

# Load widgets from YAML file
loader = ptg.YamlLoader()
namespace = loader.load("widgets.yaml")

# Access loaded widgets by name
main_window = namespace["main_window"]
settings_dialog = namespace["settings_dialog"]

# Use in window manager
with ptg.WindowManager() as manager:
    manager.add(main_window)

import pytermgui as ptg

# Load from JSON configuration
loader = ptg.JsonLoader()
namespace = loader.load("forms.json")

# Get specific widget
form = namespace["main_form"]

# Add to application
with ptg.WindowManager() as manager:
    window = ptg.Window(form, title="Registration")
    manager.add(window)

import pytermgui as ptg

# Create widget hierarchy
container = ptg.Container(
    "[bold]Settings Panel",
    "",
    ptg.Checkbox(checked=True, label="Enable notifications"),
    ptg.Slider(value=75, min_value=0, max_value=100),
    ptg.Button("Save", lambda btn: print("Saved")),
    width=40
)

# Serialize widget to dictionary
widget_data = ptg.serializer.dump(container)
print(widget_data)

# Save to file
ptg.serializer.dump_to_file(container, "settings.json")

# Later, load widget back
restored_container = ptg.serializer.load_from_file("settings.json")

import pytermgui as ptg

def create_form_from_config(config_file):
    """Create form widgets from configuration."""
    loader = ptg.JsonLoader()
    namespace = loader.load(config_file)
    
    forms = {}
    for name, widget in namespace.widgets.items():
        if isinstance(widget, ptg.Container):
            forms[name] = widget
    
    return forms

# Load multiple forms
forms = create_form_from_config("forms.json")

# Create tabbed interface
current_form = "login"

def switch_form(form_name):
    global current_form
    current_form = form_name
    # Update display logic here

# Use forms in application
with ptg.WindowManager() as manager:
    window = ptg.Window(
        forms[current_form],
        title="Forms Demo"
    )
    manager.add(window)

import pytermgui as ptg

# Define callback functions
def handle_submit(button):
    print("Form submitted!")

def handle_cancel(button):
    print("Form cancelled!")

# Callback registry for configuration files
CALLBACKS = {
    "handle_submit": handle_submit,
    "handle_cancel": handle_cancel
}

def load_with_callbacks(config_file):
    """Load widgets and bind callbacks."""
    loader = ptg.JsonLoader()
    namespace = loader.load(config_file)
    
    # Process widgets to bind callbacks
    for widget in namespace.widgets.values():
        bind_callbacks_recursive(widget)
    
    return namespace

def bind_callbacks_recursive(widget):
    """Recursively bind callbacks to widgets."""
    if hasattr(widget, 'onclick') and isinstance(widget.onclick, str):
        # Replace string callback name with actual function
        callback_name = widget.onclick
        if callback_name in CALLBACKS:
            widget.onclick = CALLBACKS[callback_name]
    
    # Process child widgets
    if hasattr(widget, 'widgets'):
        for child in widget.widgets:
            bind_callbacks_recursive(child)

# Usage
namespace = load_with_callbacks("interface.json")

import pytermgui as ptg

class StatefulForm:
    """Form that can save and restore its state."""
    
    def __init__(self):
        self.form = ptg.Container(
            "[bold]Stateful Form",
            "",
            ptg.InputField(prompt="Name:", id="name"),
            ptg.InputField(prompt="Email:", id="email"),
            ptg.Checkbox(id="newsletter", label="Newsletter"),
            "",
            ptg.Button("Save State", self.save_state),
            ptg.Button("Load State", self.load_state),
            width=50
        )
    
    def save_state(self, button):
        """Save current form state."""
        ptg.serializer.dump_to_file(self.form, "form_state.json")
        print("State saved!")
    
    def load_state(self, button):
        """Restore form state."""
        try:
            restored_form = ptg.serializer.load_from_file("form_state.json")
            # Update current form with restored values
            self.update_form_values(restored_form)
            print("State loaded!")
        except FileNotFoundError:
            print("No saved state found")
    
    def update_form_values(self, restored_form):
        """Update form with restored values."""
        # Implementation depends on specific widget ID matching
        for widget in restored_form.widgets:
            if hasattr(widget, 'id') and widget.id:
                current_widget = self.find_widget_by_id(widget.id)
                if current_widget:
                    # Copy values from restored widget
                    if hasattr(widget, 'value'):
                        current_widget.value = widget.value
                    if hasattr(widget, 'checked'):
                        current_widget.checked = widget.checked

# Usage
form = StatefulForm()