"""Editing context and overlay registration wrappers.

Routes through the ``kcsdk`` C++ module when available, falling back to
the legacy ``FreeCADGui`` Python bindings for backwards compatibility.
"""

import FreeCAD

# Try to import the C++ SDK module; None if not yet built/installed.
try:
    import kcsdk as _kcsdk
except ImportError:
    _kcsdk = None


def _gui():
    """Lazy import of FreeCADGui (not available in console mode)."""
    import FreeCADGui

    return FreeCADGui


def register_context(context_id, label, color, toolbars, match, priority=50):
    """Register an editing context.

    Parameters
    ----------
    context_id : str
        Unique identifier (e.g. ``"myaddon.edit"``).
    label : str
        Display label template.  Supports ``{name}`` placeholder.
    color : str
        Hex color for the breadcrumb (e.g. ``"#f38ba8"``).
    toolbars : list[str]
        Toolbar names to show when this context is active.
    match : callable
        Zero-argument callable returning *True* when this context is active.
    priority : int, optional
        Higher values are checked first.  Default 50.
    """
    if not isinstance(context_id, str):
        raise TypeError(f"context_id must be str, got {type(context_id).__name__}")
    if not isinstance(toolbars, list):
        raise TypeError(f"toolbars must be list, got {type(toolbars).__name__}")
    if not callable(match):
        raise TypeError("match must be callable")

    try:
        if _kcsdk is not None:
            _kcsdk.register_context(context_id, label, color, toolbars, match, priority)
        else:
            _gui().registerEditingContext(
                context_id, label, color, toolbars, match, priority
            )
    except Exception as e:
        FreeCAD.Console.PrintWarning(
            f"kindred_sdk: Failed to register context '{context_id}': {e}\n"
        )


def unregister_context(context_id):
    """Remove a previously registered editing context."""
    if not isinstance(context_id, str):
        raise TypeError(f"context_id must be str, got {type(context_id).__name__}")

    try:
        if _kcsdk is not None:
            _kcsdk.unregister_context(context_id)
        else:
            _gui().unregisterEditingContext(context_id)
    except Exception as e:
        FreeCAD.Console.PrintWarning(
            f"kindred_sdk: Failed to unregister context '{context_id}': {e}\n"
        )


def register_overlay(overlay_id, toolbars, match):
    """Register an editing overlay.

    Overlays add toolbars to whatever context is currently active when
    *match* returns True.

    Parameters
    ----------
    overlay_id : str
        Unique overlay identifier.
    toolbars : list[str]
        Toolbar names to append.
    match : callable
        Zero-argument callable returning *True* when the overlay applies.
    """
    if not isinstance(overlay_id, str):
        raise TypeError(f"overlay_id must be str, got {type(overlay_id).__name__}")
    if not isinstance(toolbars, list):
        raise TypeError(f"toolbars must be list, got {type(toolbars).__name__}")
    if not callable(match):
        raise TypeError("match must be callable")

    try:
        if _kcsdk is not None:
            _kcsdk.register_overlay(overlay_id, toolbars, match)
        else:
            _gui().registerEditingOverlay(overlay_id, toolbars, match)
    except Exception as e:
        FreeCAD.Console.PrintWarning(
            f"kindred_sdk: Failed to register overlay '{overlay_id}': {e}\n"
        )


def unregister_overlay(overlay_id):
    """Remove a previously registered editing overlay."""
    if not isinstance(overlay_id, str):
        raise TypeError(f"overlay_id must be str, got {type(overlay_id).__name__}")

    try:
        if _kcsdk is not None:
            _kcsdk.unregister_overlay(overlay_id)
        else:
            _gui().unregisterEditingOverlay(overlay_id)
    except Exception as e:
        FreeCAD.Console.PrintWarning(
            f"kindred_sdk: Failed to unregister overlay '{overlay_id}': {e}\n"
        )


def inject_commands(context_id, toolbar_name, commands):
    """Inject commands into a context's toolbar.

    Parameters
    ----------
    context_id : str
        Target context identifier.
    toolbar_name : str
        Toolbar within that context.
    commands : list[str]
        Command names to add.
    """
    if not isinstance(context_id, str):
        raise TypeError(f"context_id must be str, got {type(context_id).__name__}")
    if not isinstance(toolbar_name, str):
        raise TypeError(f"toolbar_name must be str, got {type(toolbar_name).__name__}")
    if not isinstance(commands, list):
        raise TypeError(f"commands must be list, got {type(commands).__name__}")

    try:
        if _kcsdk is not None:
            _kcsdk.inject_commands(context_id, toolbar_name, commands)
        else:
            _gui().injectEditingCommands(context_id, toolbar_name, commands)
    except Exception as e:
        FreeCAD.Console.PrintWarning(
            f"kindred_sdk: Failed to inject commands into '{context_id}': {e}\n"
        )


def current_context():
    """Return the current editing context as a dict.

    Keys: ``id``, ``label``, ``color``, ``toolbars``, ``breadcrumb``,
    ``breadcrumbColors``.  Returns ``None`` if no context is active.
    """
    try:
        if _kcsdk is not None:
            return _kcsdk.current_context()
        return _gui().currentEditingContext()
    except Exception as e:
        FreeCAD.Console.PrintWarning(
            f"kindred_sdk: Failed to get current context: {e}\n"
        )
        return None


def refresh_context():
    """Force re-resolution and update of the editing context."""
    try:
        if _kcsdk is not None:
            _kcsdk.refresh()
        else:
            _gui().refreshEditingContext()
    except Exception as e:
        FreeCAD.Console.PrintWarning(f"kindred_sdk: Failed to refresh context: {e}\n")