"""nova idp setup terraform-delegation tests (REQ-369, spec §7.5).

P3 Wave 2: verifies the ``nova idp setup --apply`` / ``--verify`` paths
delegate to ``terraform apply -auto-approve`` / ``terraform plan`` when
``terraform`` is on PATH, and fall back to the archived CFN path
(emitting a ``DeprecationWarning``) when terraform is absent.

Mirrors the importlib loading + ``mock.patch``/``monkeypatch`` style of
``tests/test_idp_setup.py`` (``lambda`` is a Python reserved word).
"""

from __future__ import annotations

import importlib.util
import sys
import warnings
from pathlib import Path
from unittest import mock

import pytest

sys.path.insert(0, str(Path(__file__).resolve().parent.parent))


def _load(mod_name, rel_path):
    spec = importlib.util.spec_from_file_location(mod_name, rel_path)
    mod = importlib.util.module_from_spec(spec)
    spec.loader.exec_module(mod)
    return mod


_SETUP_PATH = Path(__file__).resolve().parent.parent / "core" / "lambda" / "nova_idp_setup.py"
setup = _load("nova_idp_setup_tf_test", _SETUP_PATH)


# ---------------------------------------------------------------------------
# core/lambda/nova_idp_setup.py — terraform_apply / terraform_plan
# ---------------------------------------------------------------------------


class TestTerraformApply:
    def test_apply_invokes_terraform_apply_auto_approve(self, monkeypatch):
        """terraform_apply shells out to ``terraform apply -auto-approve``."""
        called = {}

        def _fake_run(cmd, **kw):
            called["cmd"] = list(cmd)
            return mock.MagicMock(returncode=0)

        monkeypatch.setattr(setup.subprocess, "run", _fake_run)
        r = setup.terraform_apply()
        assert called["cmd"] == ["terraform", "apply", "-auto-approve"]
        assert r["deployed"] is True
        assert r["returncode"] == 0
        assert r["command"] == ["terraform", "apply", "-auto-approve"]

    def test_apply_auto_approve_false_omits_flag(self, monkeypatch):
        called = {}

        def _fake_run(cmd, **kw):
            called["cmd"] = list(cmd)
            return mock.MagicMock(returncode=0)

        monkeypatch.setattr(setup.subprocess, "run", _fake_run)
        setup.terraform_apply(auto_approve=False)
        assert called["cmd"] == ["terraform", "apply"]

    def test_apply_nonzero_returncode_means_not_deployed(self, monkeypatch):
        monkeypatch.setattr(
            setup.subprocess, "run", lambda cmd, **kw: mock.MagicMock(returncode=1)
        )
        r = setup.terraform_apply()
        assert r["deployed"] is False
        assert r["returncode"] == 1


class TestTerraformPlan:
    def test_plan_invokes_terraform_plan(self, monkeypatch):
        called = {}

        def _fake_run(cmd, **kw):
            called["cmd"] = list(cmd)
            return mock.MagicMock(returncode=0)

        monkeypatch.setattr(setup.subprocess, "run", _fake_run)
        r = setup.terraform_plan()
        assert called["cmd"] == ["terraform", "plan"]
        assert r["passed"] is True
        assert r["command"] == ["terraform", "plan"]

    def test_plan_nonzero_returncode_means_not_passed(self, monkeypatch):
        monkeypatch.setattr(
            setup.subprocess, "run", lambda cmd, **kw: mock.MagicMock(returncode=2)
        )
        r = setup.terraform_plan()
        assert r["passed"] is False
        assert r["returncode"] == 2


# ---------------------------------------------------------------------------
# generate_and_deploy emits DeprecationWarning (CFN fallback path)
# ---------------------------------------------------------------------------


class TestCfnFallbackDeprecation:
    def test_generate_and_deploy_warns_on_cfn_path(self):
        """The archived CFN deploy path raises DeprecationWarning (REQ-369)."""
        with warnings.catch_warnings(record=True) as caught:
            warnings.simplefilter("always")
            with mock.patch("subprocess.check_call", return_value=0):
                r = setup.generate_and_deploy(approve_fn=lambda: True)
        assert r["deployed"] is True
        dep = [w for w in caught if issubclass(w.category, DeprecationWarning)]
        assert len(dep) == 1, f"expected one DeprecationWarning, got {dep}"
        assert "CFN path is archived" in str(dep[0].message)
        assert "docs/archive/nova-idp-cfn-v1.28.md" in str(dep[0].message)

    def test_generate_and_deploy_dry_run_does_not_warn(self):
        """--dry-run is read-only inspection; it must not warn."""
        with warnings.catch_warnings(record=True) as caught:
            warnings.simplefilter("always")
            r = setup.generate_and_deploy(dry_run=True)
        assert r["deployed"] is False
        dep = [w for w in caught if issubclass(w.category, DeprecationWarning)]
        assert dep == [], f"dry-run must not emit DeprecationWarning, got {dep}"


# ---------------------------------------------------------------------------
# nova/idp/setup.py CLI wrapper — terraform delegation vs CFN fallback
# ---------------------------------------------------------------------------


def _cli_args(**kw):
    """Build a MagicMock mimicking the argparse Namespace for `nova idp setup`."""
    a = mock.MagicMock()
    a.check = kw.get("check", False)
    a.apply = kw.get("apply", False)
    a.verify = kw.get("verify", False)
    a.dry_run = kw.get("dry_run", False)
    a.public_jwks_domain = kw.get("public_jwks_domain", None)
    return a


class TestCliApplyDelegation:
    def test_apply_delegates_to_terraform_when_on_path(self, monkeypatch, capsys):
        """terraform on PATH → --apply runs `terraform apply -auto-approve`."""
        monkeypatch.setattr("shutil.which", lambda name: "/usr/bin/terraform" if name == "terraform" else None)
        called = {}

        def _fake_run(cmd, **kw):
            called["cmd"] = list(cmd)
            return mock.MagicMock(returncode=0)

        from nova.idp import setup as cli_setup
        monkeypatch.setattr(cli_setup.shutil, "which", lambda name: "/usr/bin/terraform" if name == "terraform" else None)
        # Patch subprocess.run inside the loaded core module (used by terraform_apply).
        monkeypatch.setattr(setup.subprocess, "run", _fake_run)
        rc = cli_setup.run(_cli_args(apply=True))
        assert rc == 0
        assert called["cmd"] == ["terraform", "apply", "-auto-approve"]
        out = capsys.readouterr().out
        assert "deployed" in out

    def test_apply_falls_back_to_cfn_when_terraform_absent(self, monkeypatch, capsys):
        """terraform absent → --apply falls back to the CFN path + warns."""
        monkeypatch.setattr("shutil.which", lambda name: None)
        from nova.idp import setup as cli_setup
        monkeypatch.setattr(cli_setup.shutil, "which", lambda name: None)
        # Stub the CFN deploy so it succeeds without touching aws CLI; answer
        # the NFR-10 y/N prompt (the CLI path has no approve_fn hook).
        monkeypatch.setattr("subprocess.check_call", return_value=0)
        monkeypatch.setattr("builtins.input", lambda *a, **kw: "y")
        with warnings.catch_warnings(record=True) as caught:
            warnings.simplefilter("always")
            rc = cli_setup.run(_cli_args(apply=True))
        assert rc == 0
        dep = [w for w in caught if issubclass(w.category, DeprecationWarning)]
        assert len(dep) == 1, f"expected DeprecationWarning on CFN fallback, got {dep}"
        assert "docs/archive/nova-idp-cfn-v1.28.md" in str(dep[0].message)
        out = capsys.readouterr().out
        assert "AWS::Lambda::Function" in out  # CFN resource summary printed


class TestCliVerifyDelegation:
    def test_verify_delegates_to_terraform_plan_when_on_path(self, monkeypatch, capsys):
        """terraform on PATH → --verify runs `terraform plan`."""
        from nova.idp import setup as cli_setup
        monkeypatch.setattr(cli_setup.shutil, "which", lambda name: "/usr/bin/terraform" if name == "terraform" else None)
        called = {}

        def _fake_run(cmd, **kw):
            called["cmd"] = list(cmd)
            return mock.MagicMock(returncode=0)

        monkeypatch.setattr(setup.subprocess, "run", _fake_run)
        rc = cli_setup.run(_cli_args(verify=True))
        assert rc == 0
        assert called["cmd"] == ["terraform", "plan"]
        out = capsys.readouterr().out
        assert "passed" in out

    def test_verify_falls_back_to_kms_roundtrip_when_terraform_absent(self, monkeypatch, capsys):
        """terraform absent → --verify falls back to the existing KMS round-trip."""
        from nova.idp import setup as cli_setup
        monkeypatch.setattr(cli_setup.shutil, "which", lambda name: None)
        # The CLI loads core/lambda/nova_idp_setup.py into its own module
        # instance; stub _load_setup so verify() is deterministic and does
        # not require pyjwt/cryptography (the real round-trip is covered by
        # tests/test_idp_setup.py).
        fake_mod = mock.MagicMock()
        fake_mod.verify.return_value = {"passed": True, "detail": "KMS round-trip OK"}
        monkeypatch.setattr(cli_setup, "_load_setup", lambda: fake_mod)
        rc = cli_setup.run(_cli_args(verify=True))
        assert rc == 0
        fake_mod.verify.assert_called_once()
        out = capsys.readouterr().out
        assert "passed" in out  # KMS round-trip result printed