import hashlib
import json
import os
import sys
import tempfile

import bpy


def main():
    arguments = sys.argv[sys.argv.index("--") + 1 :] if "--" in sys.argv else []
    if len(arguments) != 2:
        raise SystemExit("usage: blender -b fixture.blend --python generate-curve-toggle-golden.py -- fixture.blend output.json")
    fixture = os.path.abspath(arguments[0])
    output = os.path.abspath(arguments[1])
    curve = bpy.data.curves.get("WebCurveData")
    if curve is None or len(curve.splines) < 1:
        raise RuntimeError("WebCurveData fixture is missing its first spline")
    before = [spline.use_cyclic_u for spline in curve.splines]
    spline_types = [spline.type for spline in curve.splines]
    spline_point_counts = [len(spline.bezier_points) if spline.type == "BEZIER" else len(spline.points) for spline in curve.splines]
    curve.splines[0].use_cyclic_u = not curve.splines[0].use_cyclic_u
    after = [spline.use_cyclic_u for spline in curve.splines]
    with tempfile.TemporaryDirectory(prefix="m9-05-curve-toggle-") as temporary:
        saved = os.path.join(temporary, "curve-toggle.blend")
        bpy.ops.wm.save_as_mainfile(filepath=saved, check_existing=False)
        bpy.ops.wm.open_mainfile(filepath=saved)
        reopened = [spline.use_cyclic_u for spline in bpy.data.curves["WebCurveData"].splines]
    with open(fixture, "rb") as source:
        fixture_sha256 = hashlib.sha256(source.read()).hexdigest()
    payload = {
        "schemaVersion": 1,
        "operator": "TOGGLE_CYCLIC",
        "fixture": "tests/files/web/nonmesh_scene.blend",
        "fixtureSha256": fixture_sha256,
        "blenderVersion": ".".join(str(value) for value in bpy.app.version),
        "curveName": "WebCurveData",
        "splineIndex": 0,
        "splineTypes": spline_types,
        "splinePointCounts": spline_point_counts,
        "beforeCyclicU": before,
        "afterCyclicU": after,
        "reopenedCyclicU": reopened,
    }
    with open(output, "w", encoding="utf-8") as destination:
        json.dump(payload, destination, indent=2, sort_keys=True)
        destination.write("\n")


if __name__ == "__main__":
    main()