"""Driver contract tests; these do not replace the real scanner diagnostic."""

import unittest

from diagnose_scanner_enumeration_restart import (
    converged,
    replays_raw_window,
    validate_recoverable_quantum,
    validate_report,
)


class ReportTests(unittest.TestCase):
    def report(self):
        return dict(schema=1, round=0, pid=123, objects_expected=4, raw_entry_budget=16,
                    raw_entries=8, raw_name_bytes=64, objects_before=0, objects_retained=4,
                    versions_retained=4, bytes_retained=4, objects_processed=4,
                    raw_page_index_parent="bucket", raw_page_index_complete=True,
                    raw_page_index_committed_entries=4,
                    raw_page_index_indexed_entries=4,
                    raw_first_entry="bucket/object-0000",
                    raw_last_entry="bucket/object-0003/xl.meta",
                    snapshot_complete=True, outcome="complete")

    def validate(self, report):
        validate_report(report, round_number=0, pid=123, objects=4, budget=16)

    def test_complete_exact_coverage_satisfies_oracle(self):
        report = self.report()
        self.validate(report)
        self.assertTrue(converged(report, 4))

    def test_incomplete_or_inexact_coverage_cannot_pass(self):
        for key, value in (("snapshot_complete", False), ("objects_retained", 3),
                           ("versions_retained", 3), ("bytes_retained", 3), ("outcome", "partial")):
            with self.subTest(key=key):
                report = self.report()
                report[key] = value
                self.assertFalse(converged(report, 4))

    def test_wrong_process_or_round_rejected(self):
        for key in ("pid", "round", "schema", "raw_entry_budget", "objects_expected"):
            with self.subTest(key=key):
                report = self.report()
                report[key] += 1
                with self.assertRaises(ValueError):
                    self.validate(report)

    def test_unbudgeted_tail_rejected(self):
        report = self.report()
        report["raw_entries"] = 17
        with self.assertRaises(ValueError):
            self.validate(report)

    def test_raw_page_index_ordering_and_bounds_are_checked(self):
        report = self.report()
        report["raw_page_index_committed_entries"] = 5
        report["raw_page_index_indexed_entries"] = 4
        with self.assertRaisesRegex(ValueError, "committed entries exceed indexed entries"):
            self.validate(report)

        report = self.report()
        report["raw_page_index_indexed_entries"] = 5
        with self.assertRaisesRegex(ValueError, "exceeds fixture object count"):
            self.validate(report)

    def test_retained_coverage_cannot_advance_without_classified_work(self):
        report = self.report()
        report["objects_before"] = 1
        report["objects_processed"] = 1
        report["objects_retained"] = 3
        with self.assertRaisesRegex(ValueError, "advanced beyond classified object work"):
            self.validate(report)

        report = self.report()
        report["objects_processed"] = 17
        with self.assertRaises(ValueError):
            self.validate(report)

    def test_missing_or_oversized_raw_marker_rejected(self):
        for value in (None, True, "", "x" * 513):
            with self.subTest(value=value):
                report = self.report()
                report["raw_first_entry"] = value
                with self.assertRaises(ValueError):
                    self.validate(report)

    def test_complete_coverage_without_entry_observation_rejected(self):
        report = self.report()
        report["raw_entries"] = 0
        report["objects_processed"] = 0
        report["raw_page_index_committed_entries"] = 3
        with self.assertRaises(ValueError):
            self.validate(report)

    def test_budgeted_object_progress_can_consume_all_raw_entries(self):
        report = self.report()
        report["raw_entries"] = 0
        report["raw_first_entry"] = None
        report["raw_last_entry"] = None
        report["objects_processed"] = 1
        report["objects_retained"] = 1
        report["versions_retained"] = 1
        report["bytes_retained"] = 1
        report["snapshot_complete"] = False
        report["outcome"] = "partial"
        self.validate(report)

    def test_missing_wrong_type_and_negative_counter_rejected(self):
        for value in (None, True, -1, "8", 1048577):
            with self.subTest(value=value):
                report = self.report()
                report["raw_entries"] = value
                with self.assertRaises(ValueError):
                    self.validate(report)

    def test_missing_completeness_or_unknown_outcome_rejected(self):
        for key in ("raw_page_index_parent", "raw_page_index_complete", "snapshot_complete", "outcome"):
            report = self.report()
            del report[key]
            with self.assertRaises(ValueError):
                self.validate(report)

    def test_non_object_report_rejected(self):
        for report in (None, [], "report"):
            with self.assertRaises(ValueError):
                self.validate(report)

    def test_repeated_raw_window_without_retained_progress_is_diagnosed(self):
        previous = self.report()
        previous["objects_retained"] = 0
        previous["versions_retained"] = 0
        previous["bytes_retained"] = 0
        previous["objects_processed"] = 0
        previous["snapshot_complete"] = False
        previous["outcome"] = "cancelled_without_cache"
        current = dict(previous, round=1, pid=124, objects_before=0)
        self.assertTrue(replays_raw_window(previous, current))

        advanced = dict(current, objects_retained=1)
        self.assertFalse(replays_raw_window(previous, advanced))

    def test_recoverable_quantum_requires_three_stage_progress_and_convergence(self):
        first = self.report()
        first.update(round=0, pid=123, raw_entries=2, raw_page_index_committed_entries=2,
                     raw_page_index_indexed_entries=2, objects_processed=2, objects_before=0,
                     objects_retained=2, versions_retained=2, bytes_retained=2,
                     snapshot_complete=False, outcome="partial")
        second = self.report()
        second.update(round=1, pid=124, raw_entries=2, raw_page_index_committed_entries=4,
                      raw_page_index_indexed_entries=4, objects_processed=2, objects_before=2,
                      objects_retained=4, snapshot_complete=True, outcome="complete")
        validate_recoverable_quantum([first, second], objects=4, budget=16, require_converged=True)

    def test_recoverable_quantum_rejects_restart_regression(self):
        first = self.report()
        first.update(snapshot_complete=False, outcome="partial", objects_retained=2,
                     versions_retained=2, bytes_retained=2)
        second = self.report()
        second.update(round=1, pid=124, objects_before=1, objects_retained=1,
                      versions_retained=1, bytes_retained=1, snapshot_complete=False,
                      outcome="partial")
        with self.assertRaisesRegex(ValueError, "did not survive process restart"):
            validate_recoverable_quantum([first, second], objects=4, budget=16, require_converged=False)

    def test_recoverable_quantum_allows_new_raw_page_parent_after_processing(self):
        first = self.report()
        first.update(snapshot_complete=False, outcome="partial", objects_before=0,
                     objects_processed=0, objects_retained=0, versions_retained=0,
                     bytes_retained=0, raw_page_index_parent="bucket",
                     raw_page_index_complete=True, raw_page_index_committed_entries=4,
                     raw_page_index_indexed_entries=4)
        second = self.report()
        second.update(round=1, pid=124, raw_entries=0, raw_first_entry=None,
                      raw_last_entry=None, raw_name_bytes=0, objects_before=0,
                      objects_processed=2, objects_retained=2,
                      versions_retained=2, bytes_retained=2,
                      snapshot_complete=False, outcome="partial",
                      raw_page_index_parent="bucket/object-0000",
                      raw_page_index_complete=False,
                      raw_page_index_committed_entries=1,
                      raw_page_index_indexed_entries=1)
        validate_recoverable_quantum([first, second], objects=4, budget=16, require_converged=False)

    def test_recoverable_quantum_rejects_missing_processing_stage(self):
        report = self.report()
        report["objects_processed"] = 0
        report["objects_retained"] = 0
        report["versions_retained"] = 0
        report["bytes_retained"] = 0
        report["snapshot_complete"] = False
        report["outcome"] = "partial"
        with self.assertRaisesRegex(ValueError, "object classification"):
            validate_recoverable_quantum([report], objects=4, budget=16, require_converged=False)


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