"""Headless runner entry points for silorunner compute jobs.

These functions are invoked via ``create --console -e`` by the
silorunner binary.  They must work without a display server.

Entry Points
------------
dag_extract(input_path, output_path)
    Extract feature DAG and write JSON.
validate(input_path, output_path)
    Rebuild all features and report pass/fail per node.
export(input_path, output_path, format='step')
    Export geometry to STEP, IGES, STL, or OBJ.
"""

import json

import FreeCAD


def dag_extract(input_path, output_path):
    """Extract the feature DAG from a Create file.

    Parameters
    ----------
    input_path : str
        Path to the ``.kc`` or ``.FCStd`` file.
    output_path : str
        Path to write the JSON output.

    Output JSON::

        {"nodes": [...], "edges": [...]}
    """
    from dag import extract_dag

    doc = FreeCAD.openDocument(input_path)
    try:
        nodes, edges = extract_dag(doc)
        with open(output_path, "w") as f:
            json.dump({"nodes": nodes, "edges": edges}, f)
        FreeCAD.Console.PrintMessage(
            f"DAG extracted: {len(nodes)} nodes, {len(edges)} edges -> {output_path}\n"
        )
    finally:
        FreeCAD.closeDocument(doc.Name)


def validate(input_path, output_path):
    """Validate a Create file by rebuilding all features.

    Parameters
    ----------
    input_path : str
        Path to the ``.kc`` or ``.FCStd`` file.
    output_path : str
        Path to write the JSON output.

    Output JSON::

        {
            "valid": true/false,
            "nodes": [
                {"node_key": "Pad001", "state": "clean", "message": null, "properties_hash": "..."},
                ...
            ]
        }
    """
    from dag import classify_type, compute_properties_hash

    doc = FreeCAD.openDocument(input_path)
    try:
        doc.recompute()

        results = []
        all_valid = True

        for obj in doc.Objects:
            if not hasattr(obj, "TypeId"):
                continue
            node_type = classify_type(obj.TypeId)
            if node_type is None:
                continue

            state = "clean"
            message = None
            if hasattr(obj, "isValid") and not obj.isValid():
                state = "failed"
                message = f"Feature {obj.Label} failed to recompute"
                all_valid = False

            results.append(
                {
                    "node_key": obj.Name,
                    "state": state,
                    "message": message,
                    "properties_hash": compute_properties_hash(obj),
                }
            )

        with open(output_path, "w") as f:
            json.dump({"valid": all_valid, "nodes": results}, f)

        status = "PASS" if all_valid else "FAIL"
        FreeCAD.Console.PrintMessage(
            f"Validation {status}: {len(results)} nodes -> {output_path}\n"
        )
    finally:
        FreeCAD.closeDocument(doc.Name)


def export(input_path, output_path, format="step"):
    """Export a Create file to an external geometry format.

    Parameters
    ----------
    input_path : str
        Path to the ``.kc`` or ``.FCStd`` file.
    output_path : str
        Path to write the exported file.
    format : str
        One of ``step``, ``iges``, ``stl``, ``obj``.
    """
    import Part

    doc = FreeCAD.openDocument(input_path)
    try:
        shapes = [
            obj.Shape for obj in doc.Objects if hasattr(obj, "Shape") and obj.Shape
        ]
        if not shapes:
            raise ValueError("No geometry found in document")

        compound = Part.makeCompound(shapes)

        format_lower = format.lower()
        if format_lower == "step":
            compound.exportStep(output_path)
        elif format_lower == "iges":
            compound.exportIges(output_path)
        elif format_lower == "stl":
            import Mesh

            Mesh.export([compound], output_path)
        elif format_lower == "obj":
            import Mesh

            Mesh.export([compound], output_path)
        else:
            raise ValueError(f"Unsupported format: {format}")

        FreeCAD.Console.PrintMessage(
            f"Exported {format_lower.upper()} -> {output_path}\n"
        )
    finally:
        FreeCAD.closeDocument(doc.Name)