"""CLI tests for the residual-diff subcommand (#23 follow-on #5)."""

from __future__ import annotations

import datetime as dt

from security_scanner.cli import main
from security_scanner.storage.base import RefState

NOW = dt.datetime(2026, 6, 16, tzinfo=dt.UTC)


class FakeTwoBranchStore:
    """main @ Smain and feat @ Sfeat with overlapping + distinct findings."""

    def list_ref_states(self, repo_id: str) -> list[RefState]:
        return [
            RefState(repo_id=repo_id, repo_url="https://e/r",
                     ref_name="refs/heads/main", last_seen_sha="Smain", updated_at=NOW),
            RefState(repo_id=repo_id, repo_url="https://e/r",
                     ref_name="refs/heads/feat", last_seen_sha="Sfeat", updated_at=NOW),
        ]

    def read_observations_for_repo(
        self, repo_id: str, *, include_legacy: bool = False
    ) -> list[dict]:
        return [
            {"branch": "main", "commit": "Smain", "findingId": "f_shared"},
            {"branch": "main", "commit": "Smain", "findingId": "f_base_only"},
            {"branch": "feat", "commit": "Sfeat", "findingId": "f_shared"},
            {"branch": "feat", "commit": "Sfeat", "findingId": "f_added"},
        ]


def _patch(monkeypatch, store):
    monkeypatch.setattr(
        "security_scanner.cli._store.create_finding_store",
        lambda backend, **kwargs: store,
    )


def test_residual_diff_reports_added_removed_unchanged(monkeypatch, capsys):
    _patch(monkeypatch, FakeTwoBranchStore())

    exit_code = main([
        "residual-diff", "--repo", "repo_x",
        "--base", "main", "--head", "feat", "--storage-backend", "dynamodb",
    ])

    out = capsys.readouterr().out
    assert exit_code == 0
    assert "repo: repo_x" in out
    assert "base: main @ Smain" in out
    assert "head: feat @ Sfeat" in out
    assert "added (1):" in out and "- f_added" in out
    assert "removed (1):" in out and "- f_base_only" in out
    assert "unchanged: 1" in out


def test_residual_diff_missing_branch_fails_closed(monkeypatch, capsys):
    _patch(monkeypatch, FakeTwoBranchStore())

    exit_code = main([
        "residual-diff", "--repo", "repo_x",
        "--base", "main", "--head", "nope", "--storage-backend", "dynamodb",
    ])

    err = capsys.readouterr().err
    assert exit_code == 2
    assert "nope" in err and "no residual for branch" in err


def test_residual_diff_rejects_jsonl_backend(capsys):
    exit_code = main([
        "residual-diff", "--repo", "repo_x",
        "--base", "main", "--head", "feat", "--storage-backend", "jsonl",
    ])
    assert exit_code == 2
    assert "dynamodb only" in capsys.readouterr().err