import hashlib
import importlib.machinery
import importlib.util
import io
import json
import os
from pathlib import Path
import subprocess
import tarfile
import tempfile
import unittest
from contextlib import redirect_stdout
from unittest import mock


SCRIPT_DIR = Path(__file__).resolve().parent
RUNNER_PATH = SCRIPT_DIR / "nodedc-deploy"
BUILDER_PATH = (
    SCRIPT_DIR / "build-engine-mcp-gelios-items-envelope-artifact.mjs"
)
ENGINE_ROOT = SCRIPT_DIR.parent.parent.parent / "NODEDC_ENGINE_INFRA"
PATCH_ID = "engine-mcp-gelios-items-envelope-20991231-999"


def load_runner():
    loader = importlib.machinery.SourceFileLoader(
        "nodedc_engine_mcp_gelios_items_envelope",
        str(RUNNER_PATH),
    )
    spec = importlib.util.spec_from_loader(loader.name, loader)
    module = importlib.util.module_from_spec(spec)
    loader.exec_module(module)
    return module


RUNNER = load_runner()


class EngineMcpGeliosItemsEnvelopeTest(unittest.TestCase):
    def require_current_target_source(self):
        for relative_path, expected in (
            RUNNER.ENGINE_MCP_GELIOS_ITEMS_ENVELOPE_TARGET_SHA256.items()
        ):
            path = ENGINE_ROOT / relative_path
            if (
                not path.is_file()
                or hashlib.sha256(path.read_bytes()).hexdigest() != expected
            ):
                self.skipTest("Gelios items envelope source advanced")

    def build(self, artifact_dir, engine_root=ENGINE_ROOT):
        environment = os.environ.copy()
        environment["NODEDC_ENGINE_SOURCE_ROOT"] = str(engine_root)
        environment["NODEDC_DEPLOY_ARTIFACT_DIR"] = str(artifact_dir)
        completed = subprocess.run(
            ["node", str(BUILDER_PATH), PATCH_ID],
            check=True,
            capture_output=True,
            text=True,
            env=environment,
        )
        return json.loads(completed.stdout)

    def test_builder_is_deterministic_exact_and_backend_only(self):
        self.require_current_target_source()
        with tempfile.TemporaryDirectory(
            prefix="nodedc-engine-mcp-gelios-items-"
        ) as directory:
            root = Path(directory)
            first = self.build(root / "first")
            second = self.build(root / "second")
            first_artifact = Path(first["artifact"])
            second_artifact = Path(second["artifact"])
            self.assertEqual(
                first_artifact.read_bytes(),
                second_artifact.read_bytes(),
            )
            self.assertEqual(first["services"], ["nodedc-backend"])
            self.assertEqual(
                first["providerPackageTransition"],
                "gelios.provider.v11-to-v12",
            )
            self.assertEqual(first["responseCollectionPath"], "items")
            self.assertTrue(first["historicalExecutionPackagePreserved"])
            self.assertFalse(first["engineCompilerChanged"])
            self.assertFalse(first["rawProviderValuesIncluded"])

            extract = root / "extract"
            with tarfile.open(first_artifact, "r:gz") as archive:
                archive.extractall(extract, filter="data")
            entries = tuple(
                (extract / "files.txt").read_text(encoding="utf-8").splitlines()
            )
            payload = extract / "payload"
            self.assertEqual(
                entries,
                RUNNER.ENGINE_MCP_GELIOS_ITEMS_ENVELOPE_ARTIFACT_ENTRIES,
            )
            self.assertEqual(
                RUNNER.component_services("engine", entries),
                ("nodedc-backend",),
            )
            RUNNER.validate_engine_mcp_gelios_items_envelope_slice(
                payload,
                entries,
            )

    def test_catalogs_preserve_history_and_have_one_active_authority(self):
        self.require_current_target_source()
        execution = json.loads(
            (
                ENGINE_ROOT
                / "nodedc-source/server/assets/execution-plans/v1/catalog.json"
            ).read_text(encoding="utf-8")
        )
        security = json.loads(
            (
                ENGINE_ROOT
                / "nodedc-source/server/assets/provider-packages/v1/catalog.json"
            ).read_text(encoding="utf-8")
        )
        execution_ids = [item["id"] for item in execution["packages"]]
        security_ids = [item["id"] for item in security["packages"]]
        self.assertIn("gelios.provider.v11", execution_ids)
        self.assertIn("gelios.provider.v12", execution_ids)
        self.assertNotIn("gelios.provider.v11", security_ids)
        self.assertEqual(security_ids.count("gelios.provider.v12"), 1)

    def test_preflight_requires_045_foundation_and_absent_descriptor(self):
        with tempfile.TemporaryDirectory(
            prefix="nodedc-engine-mcp-gelios-items-preflight-"
        ) as directory:
            root = Path(directory)
            hashes = {}
            for mapping in (
                RUNNER.ENGINE_MCP_GELIOS_ITEMS_ENVELOPE_PREDECESSOR_SHA256,
                RUNNER.ENGINE_MCP_GELIOS_ITEMS_ENVELOPE_FOUNDATION_SHA256,
            ):
                for relative_path, expected in mapping.items():
                    path = root / relative_path
                    path.parent.mkdir(parents=True, exist_ok=True)
                    path.write_text("installed\n", encoding="utf-8")
                    hashes[path] = expected
            with (
                mock.patch.object(RUNNER, "component_root", return_value=root),
                mock.patch.object(
                    RUNNER,
                    "sha256_file",
                    side_effect=lambda path: hashes[Path(path)],
                ),
                mock.patch.object(
                    RUNNER,
                    "preflight_engine_credential_backend_runtime",
                    return_value={"mode": "verified-derived-retry"},
                ),
            ):
                result = (
                    RUNNER
                    .preflight_engine_mcp_gelios_items_envelope_predecessor()
                )
            self.assertEqual(
                result["mode"],
                "gelios-provider-v11-to-v12-items-envelope",
            )
            self.assertIn(
                RUNNER.ENGINE_MCP_EXECUTION_PLAN_SANDBOX_RUNTIME_DESCRIPTOR_REL,
                result["foundation_sha256"],
            )

    def test_plan_renders_exact_untouched_boundaries(self):
        self.require_current_target_source()
        with tempfile.TemporaryDirectory(
            prefix="nodedc-engine-mcp-gelios-items-plan-"
        ) as directory:
            root = Path(directory)
            artifact = Path(self.build(root / "artifacts")["artifact"])
            live_root = root / "live"
            live_root.mkdir()
            preflight = {
                "mode": "gelios-provider-v11-to-v12-items-envelope",
                "predecessor_sha256": dict(
                    RUNNER.ENGINE_MCP_GELIOS_ITEMS_ENVELOPE_PREDECESSOR_SHA256
                ),
                "foundation_sha256": dict(
                    RUNNER.ENGINE_MCP_GELIOS_ITEMS_ENVELOPE_FOUNDATION_SHA256
                ),
                "target_sha256": dict(
                    RUNNER.ENGINE_MCP_GELIOS_ITEMS_ENVELOPE_TARGET_SHA256
                ),
                "new_paths": tuple(
                    RUNNER.ENGINE_MCP_GELIOS_ITEMS_ENVELOPE_NEW_PATHS
                ),
                "backend_mode": "verified-derived-retry",
            }
            output = io.StringIO()
            with (
                mock.patch.object(RUNNER, "validate_artifact_location"),
                mock.patch.object(RUNNER, "ensure_layout"),
                mock.patch.object(RUNNER, "TMP_DIR", root),
                mock.patch.object(RUNNER, "component_root", return_value=live_root),
                mock.patch.object(
                    RUNNER,
                    "component_compose_root",
                    return_value=live_root,
                ),
                mock.patch.object(
                    RUNNER,
                    "preflight_engine_mcp_gelios_items_envelope_predecessor",
                    return_value=preflight,
                ),
                mock.patch.object(
                    RUNNER,
                    "preflight_engine_credential_backend_runtime",
                    return_value={"mode": "verified-derived-retry"},
                ),
                mock.patch.object(RUNNER, "state_has_sha", return_value=False),
                mock.patch.object(
                    RUNNER,
                    "state_has_patch_id",
                    return_value=False,
                ),
                redirect_stdout(output),
            ):
                RUNNER.plan_artifact(artifact)
            plan = output.getvalue()
            self.assertIn("services=nodedc-backend", plan)
            self.assertIn(
                "engine_mcp_execution_history_v11=preserved",
                plan,
            )
            self.assertIn("engine_mcp_security_authority_v12=exclusive", plan)
            self.assertIn("engine_mcp_compiler_changed=no", plan)
            self.assertIn("l2_graph=untouched", plan)
            self.assertIn("n8n_core=untouched", plan)
            self.assertIn("credentials=preserved", plan)

    def test_healthchecks_dispatch_runtime_acceptance(self):
        entries = RUNNER.ENGINE_MCP_GELIOS_ITEMS_ENVELOPE_ARTIFACT_ENTRIES
        with tempfile.TemporaryDirectory(
            prefix="nodedc-engine-mcp-gelios-items-health-"
        ) as directory:
            root = Path(directory)
            all_hashes = {
                **RUNNER.ENGINE_MCP_GELIOS_ITEMS_ENVELOPE_TARGET_SHA256,
                **RUNNER.ENGINE_MCP_GELIOS_ITEMS_ENVELOPE_FOUNDATION_SHA256,
            }
            for relative_path in all_hashes:
                path = root / relative_path
                path.parent.mkdir(parents=True, exist_ok=True)
                path.write_text("target\n", encoding="utf-8")

            def target_hash(path):
                relative_path = Path(path).relative_to(root).as_posix()
                return all_hashes[relative_path]

            with (
                mock.patch.object(RUNNER, "component_root", return_value=root),
                mock.patch.object(
                    RUNNER,
                    "sha256_file",
                    side_effect=target_hash,
                ),
                mock.patch.object(RUNNER, "healthcheck_compose_service"),
                mock.patch.object(
                    RUNNER,
                    "component_healthchecks",
                    return_value=(),
                ),
                mock.patch.object(
                    RUNNER,
                    "preflight_engine_credential_backend_runtime",
                    return_value={"mode": "verified-derived-retry"},
                ),
                mock.patch.object(
                    RUNNER,
                    "accept_engine_mcp_gelios_items_envelope_runtime",
                    return_value={"live": "accepted"},
                ) as acceptance,
                mock.patch.object(RUNNER, "healthcheck_container"),
            ):
                RUNNER.run_healthchecks(
                    "engine",
                    entries,
                    ("nodedc-backend",),
                )
            acceptance.assert_called_once_with()

    def test_live_acceptance_proves_catalog_authority_and_generic_compiler(self):
        expected_live = (
            "engine-mcp-gelios-items-envelope:"
            "0.11.0:v11-history:v12-authority:items"
        )
        with (
            mock.patch.object(RUNNER, "component_root", return_value=ENGINE_ROOT),
            mock.patch.object(
                RUNNER,
                "validate_engine_mcp_gelios_items_envelope_slice",
            ),
            mock.patch.object(
                RUNNER,
                "engine_backend_container_id",
                return_value="backend",
            ),
            mock.patch.object(
                RUNNER,
                "run_engine_backend_probe",
                return_value=expected_live,
            ) as backend_probe,
        ):
            result = RUNNER.accept_engine_mcp_gelios_items_envelope_runtime()
        self.assertEqual(result["live"], expected_live)
        probe_source = backend_probe.call_args.args[0][-1]
        self.assertIn("gelios.provider.v11", probe_source)
        self.assertIn("authorities.length!==1", probe_source)
        self.assertIn("/gelios|robot2b/i.test(compiler)", probe_source)


if __name__ == "__main__":
    unittest.main(verbosity=2)
