from __future__ import annotations

import copy
import importlib.util
import json
import pathlib
import sys

import yaml


TOOL_PATH = pathlib.Path(__file__).resolve().parents[1] / "posture_feedback.py"
SPEC = importlib.util.spec_from_file_location("posture_feedback", TOOL_PATH)
feedback = importlib.util.module_from_spec(SPEC)
assert SPEC and SPEC.loader
sys.modules[SPEC.name] = feedback
SPEC.loader.exec_module(feedback)


def declaration(service="example") -> dict:
    return {
        "schema_version": "0.1",
        "framework": "netkingdom-tenancy-posture",
        "service": service,
        "role": "test-service",
        "responsible_repo": "example-owner",
        "tenancy": {
            "current": {"I": 1, "A": 1, "E": 0, "P": 0, "R": 1, "V": 0},
            "target": {"I": 1, "A": 1, "E": 0, "P": 0, "R": 1, "V": 0},
            "reviewed": "2026-08-01",
            "review_due": "2026-12-31",
            "service_class": "interactive",
            "reason": {
                "I": "floor explained",
                "A": "floor explained",
                "E": "floor explained",
                "P": "floor explained",
                "R": "floor explained",
                "V": "floor explained",
            },
        },
    }


def write_declaration(tmp_path: pathlib.Path, document: dict, name="tenancy.yaml") -> pathlib.Path:
    path = tmp_path / name
    path.write_text(yaml.safe_dump(document, sort_keys=False), encoding="utf-8")
    return path


def build(path: pathlib.Path, *, as_of="2026-08-23T12:00:00Z", horizon=14, fail_on="none"):
    return feedback.build_report(
        [path],
        as_of=feedback.parse_timestamp(as_of),
        horizon_days=horizon,
        fail_on=fail_on,
    )


def classes(report: dict) -> list[str]:
    return [item["class"] for item in report["findings"]]


def test_checked_in_reference_emits_five_proposals_and_no_authority():
    repo_root = pathlib.Path(__file__).resolve().parents[3]
    path = repo_root / "examples/posture-feedback/expired-e2.yaml"

    report = build(path)

    assert report["summary"] == {
        "total": 5,
        "high": 1,
        "medium": 3,
        "low": 1,
        "unknown_owner": 0,
    }
    assert report["automation"] == {
        "mode": "proposal-only",
        "external_write_permitted": False,
        "policy_mutation_permitted": False,
        "declaration_mutation_permitted": False,
    }


def test_missing_adversarial_freshness_is_unknown_without_owner_inference(tmp_path):
    document = declaration()
    document["tenancy"]["current"]["E"] = 2
    document["tenancy"]["target"]["E"] = 2
    document["tenancy"]["reason"].pop("E")
    document["evidence"] = {"E2": "docs/evidence/e2.md"}
    path = write_declaration(tmp_path, document)

    report = build(path)

    finding = next(item for item in report["findings"] if item["class"] == "evidence-freshness-unknown")
    assert finding["owner"] == "unknown"
    assert finding["evidence_state"] == "unknown"


def test_exact_evidence_expiry_is_still_valid_but_due(tmp_path):
    document = declaration()
    document["tenancy"]["current"]["E"] = 2
    document["tenancy"]["target"]["E"] = 2
    document["tenancy"]["reason"].pop("E")
    document["evidence"] = {"E2": "docs/evidence/e2.md"}
    document["evidence_freshness"] = {
        "E2": {
            "kind": "adversarial",
            "observed_at": "2026-08-22T12:00:00Z",
            "valid_until": "2026-08-23T12:00:00Z",
            "responsible_repo": "evidence-owner",
            "scope": "bounded",
            "remediation": "repeat",
        }
    }
    path = write_declaration(tmp_path, document)

    report = build(path, horizon=0)

    assert "evidence-expired" not in classes(report)
    assert "evidence-due-soon" in classes(report)


def test_review_due_date_expires_after_utc_calendar_day(tmp_path):
    document = declaration()
    document["tenancy"]["review_due"] = "2026-08-23"
    path = write_declaration(tmp_path, document)

    due_today = build(path, as_of="2026-08-23T23:59:59Z", horizon=0)
    overdue = build(path, as_of="2026-08-24T00:00:00Z", horizon=0)

    assert "posture-review-due-soon" in classes(due_today)
    assert "posture-review-overdue" not in classes(due_today)
    assert "posture-review-overdue" in classes(overdue)


def test_posture_owner_is_unknown_when_not_declared(tmp_path):
    document = declaration()
    del document["responsible_repo"]
    document["tenancy"]["review_due"] = "2026-08-01"
    path = write_declaration(tmp_path, document)

    report = build(path)

    finding = next(item for item in report["findings"] if item["class"] == "posture-review-overdue")
    assert finding["owner"] == "unknown"
    assert report["summary"]["unknown_owner"] == 1


def test_multi_service_declaration_is_evaluated_per_service(tmp_path):
    first = declaration("first")
    second = declaration("second")
    for entry in (first, second):
        entry.pop("schema_version")
        entry.pop("framework")
    first["tenancy"]["gap"] = {"A": "first gap"}
    second["tenancy"]["gap"] = {"V": "second gap"}
    document = {
        "schema_version": "0.1",
        "framework": "netkingdom-tenancy-posture",
        "services": [first, second],
    }
    path = write_declaration(tmp_path, document)

    report = build(path)

    assert {(item["service"], item["control"]) for item in report["findings"]} == {
        ("first", "A"),
        ("second", "V"),
    }


def test_mechanical_evidence_without_expiry_creates_no_freshness_finding(tmp_path):
    document = declaration()
    document["tenancy"]["current"]["A"] = 2
    document["tenancy"]["target"]["A"] = 2
    document["tenancy"]["reason"].pop("A")
    document["evidence"] = {"A2": "tests/authorization.py"}
    document["evidence_freshness"] = {
        "A2": {
            "kind": "mechanical",
            "observed_at": "2026-08-22T12:00:00Z",
            "responsible_repo": "example-owner",
            "scope": "continuous test",
            "remediation": "repair the test",
        }
    }
    path = write_declaration(tmp_path, document)

    report = build(path)

    assert not any(item["class"].startswith("evidence-") for item in report["findings"])


def test_report_digest_is_stable_for_identical_inputs(tmp_path):
    path = write_declaration(tmp_path, declaration())

    first = build(path)
    second = build(path)

    assert first == second
    assert first["report_digest"].startswith("sha256:")


def test_workspace_source_identifier_is_portable_and_not_an_owner_inference():
    repo_root = pathlib.Path(__file__).resolve().parents[3]
    path = repo_root / "examples/posture-feedback/expired-e2.yaml"

    report = build(path)

    assert {item["source"] for item in report["findings"]} == {
        "net-kingdom/examples/posture-feedback/expired-e2.yaml"
    }
    gap = next(item for item in report["findings"] if item["class"] == "declared-gap")
    zone = next(item for item in report["findings"] if item["class"].startswith("zone-"))
    assert gap["owner"] == "net-kingdom"
    assert zone["owner"] == "team:platform-security"
    assert all(item["owner"] != item["source"] for item in report["findings"])


def test_fail_on_threshold_changes_ok_not_findings(tmp_path):
    document = declaration()
    document["tenancy"]["gap"] = {"R": "declared gap"}
    path = write_declaration(tmp_path, document)

    report_only = build(path, fail_on="none")
    failing = build(path, fail_on="low")

    assert report_only["ok"] is True
    assert failing["ok"] is False
    assert report_only["findings"] == failing["findings"]


def test_invalid_declaration_is_reported_and_cli_exits_two(tmp_path, capsys):
    document = declaration()
    del document["role"]
    path = write_declaration(tmp_path, document)

    exit_code = feedback.main(
        [
            "--as-of",
            "2026-08-23T12:00:00Z",
            "--fail-on",
            "none",
            str(path),
        ]
    )
    payload = json.loads(capsys.readouterr().out)

    assert exit_code == 2
    assert payload["ok"] is False
    assert payload["validation_errors"]


def test_timestamp_without_offset_is_rejected():
    try:
        feedback.parse_timestamp("2026-08-23T12:00:00")
    except ValueError as exc:
        assert "explicit UTC offset" in str(exc)
    else:
        raise AssertionError("timezone-naive timestamp was accepted")