"""A session's composition is prepared without booting a Python kernel.

The lazy-kernel path needs a session's tools, instructions and hooks before any
cell runs; only the daemon's real runtime can show that no kernel process was
started for it, so this runs through an inspected daemon.
"""

import unittest

from harness import ROOT, Albedo, Provider, exclusive, text
from inspect_support import Inspection


@exclusive
class PrepareWithoutKernelTests(unittest.TestCase):
    def test_a_prepared_session_has_tools_and_no_kernel(self):
        provider = Provider(lambda request: text("ok"))
        self.addCleanup(provider.close)

        def prepare(app):
            app.daemon.env["ALBEDO_INSPECT"] = "1"

        with Albedo(provider, prepare=prepare) as app:
            session = app.session()
            probe = Inspection(app, ROOT / "test/e2e/albedo_prepare_probe.erl")
            report = probe.call_json(
                "prepare_json", f'[<<"{session}">>, <<"{app.workspace}">>]'
            )
            self.assertGreater(report["tools"], 0, report)
            self.assertTrue(report["instructions"], report)
            self.assertFalse(report["kernel_held"], report)