import copy
import importlib.util
import json
from pathlib import Path
import unittest

ROOT = Path(__file__).resolve().parents[1]
spec = importlib.util.spec_from_file_location("decision", ROOT / "skills/codex-subagent-router/scripts/validate_decision_record.py")
module = importlib.util.module_from_spec(spec)
spec.loader.exec_module(module)


class DecisionTests(unittest.TestCase):
    def setUp(self):
        self.record = json.loads((ROOT / "examples/decisions/resolved.json").read_text())

    def test_valid_resolution(self):
        self.assertEqual(module.validate(self.record), [])

    def test_counter_survives_continuation(self):
        previous = copy.deepcopy(self.record)
        self.record["same_class_failures"] = 0
        self.assertTrue(module.validate(self.record, previous))

    def test_reassessment_required(self):
        self.record["reassessment"] = ""
        self.assertTrue(module.validate(self.record))

    def test_unresolved_counterexample_blocks_resolution(self):
        self.record["unresolved"] = ["reproducible contrary result"]
        self.assertTrue(module.validate(self.record))

    def test_stale_baseline_blocks_resolution(self):
        self.record["verification"]["baseline"] = "old"
        self.assertTrue(module.validate(self.record))

    def test_parent_must_understand(self):
        self.record["verification"]["parent_understands"] = False
        self.assertTrue(module.validate(self.record))

    def test_environment_and_authority_do_not_escalate_to_astra(self):
        for category in ("environment", "authority"):
            self.record["failure_class"] = category
            self.record["escalation"]["target"] = "astra"
            self.assertTrue(module.validate(self.record))

    def test_zero_failure_proactive_astra_consultation(self):
        self.record["failure_class"] = "reasoning"
        self.record["status"] = "investigating"
        self.record["same_class_failures"] = 0
        self.record["reassessment"] = ""
        self.record["escalation"] = {
            "target": "astra",
            "reason": "Proactive review of a high-impact architectural choice.",
            "expert_consultations": 1,
            "followup_basis": "",
        }
        self.record["unresolved"] = ["expert consultation pending"]
        self.assertEqual(module.validate(self.record), [])

    def test_more_than_three_progressive_consultations(self):
        self.record["escalation"]["expert_consultations"] = 4
        self.record["escalation"]["followup_basis"] = "new discriminator results across rounds"
        self.assertEqual(module.validate(self.record), [])

    def test_multiple_consultations_need_basis(self):
        self.record["escalation"]["expert_consultations"] = 2
        self.assertIn(
            "additional consultation requires new evidence or a specific omission",
            module.validate(self.record),
        )

    def test_consultation_counter_cannot_decrease_across_class_change(self):
        previous = copy.deepcopy(self.record)
        previous["escalation"]["expert_consultations"] = 4
        previous["escalation"]["followup_basis"] = "prior progressive rounds"
        self.record["failure_class"] = "reasoning"
        self.record["escalation"]["expert_consultations"] = 3
        self.record["escalation"]["followup_basis"] = "current evidence"
        self.assertIn(
            "expert consultation counter decreased across continuation",
            module.validate(self.record, previous),
        )

    def test_consultation_counter_can_increase_with_basis(self):
        previous = copy.deepcopy(self.record)
        previous["escalation"]["expert_consultations"] = 1
        self.record["escalation"]["expert_consultations"] = 4
        self.record["escalation"]["followup_basis"] = "new discriminator results"
        self.assertEqual(module.validate(self.record, previous), [])

    def test_malformed_previous_consultation_counter_is_rejected(self):
        previous = copy.deepcopy(self.record)
        previous["escalation"]["expert_consultations"] = True
        self.assertIn(
            "previous expert_consultations must be a nonnegative integer",
            module.validate(self.record, previous),
        )

    def test_recovery_required(self):
        self.record["recovery_route"] = ""
        self.assertTrue(module.validate(self.record))

    def test_bad_shapes_and_boolean_counters(self):
        for value in (None, [], True):
            self.assertTrue(module.validate(value))
        self.record["same_class_failures"] = True
        self.assertTrue(module.validate(self.record))

    def test_unhashable_enum_fields_are_rejected(self):
        for key in ("failure_class", "status"):
            record = copy.deepcopy(self.record)
            record[key] = []
            self.assertTrue(module.validate(record))
        self.record["escalation"]["target"] = {}
        self.assertTrue(module.validate(self.record))