"""Tests for infrastructure.error_capture module."""

import sqlite3
from datetime import UTC, datetime, timedelta
from unittest.mock import patch

from infrastructure.error_capture import (
    _dedup_cache,
    _get_git_context,
    _is_duplicate,
    _stack_hash,
    capture_error,
)


def _make_exception():
    """Helper that always raises from the same line for stable hashing."""
    raise ValueError("test error")


class TestStackHash:
    """Test _stack_hash produces stable hashes."""

    def test_hash_is_deterministic_for_same_exception(self):
        """Same exception object always produces the same hash."""
        try:
            _make_exception()
        except ValueError as e:
            hash1 = _stack_hash(e)
            hash2 = _stack_hash(e)
        assert hash1 == hash2

    def test_different_exception_types_differ(self):
        try:
            raise ValueError("x")
        except ValueError as e1:
            hash1 = _stack_hash(e1)

        try:
            raise TypeError("x")
        except TypeError as e2:
            hash2 = _stack_hash(e2)

        assert hash1 != hash2

    def test_hash_is_hex_string(self):
        try:
            raise RuntimeError("test")
        except RuntimeError as e:
            h = _stack_hash(e)
        assert len(h) == 16
        assert all(c in "0123456789abcdef" for c in h)


class TestIsDuplicate:
    """Test deduplication logic."""

    def setup_method(self):
        _dedup_cache.clear()

    def test_first_occurrence_not_duplicate(self):
        assert _is_duplicate("hash_abc") is False

    def test_second_occurrence_is_duplicate(self):
        _is_duplicate("hash_dup")
        assert _is_duplicate("hash_dup") is True

    def test_different_hashes_not_duplicates(self):
        _is_duplicate("hash_1")
        assert _is_duplicate("hash_2") is False

    def test_stale_entries_pruned(self):
        """Old entries beyond 2x the dedup window should be pruned."""
        from config import settings

        window = settings.error_dedup_window_seconds
        # Seed a stale entry far in the past
        stale_time = datetime.now(UTC) - timedelta(seconds=window * 3)
        _dedup_cache["stale_hash"] = stale_time

        # Calling _is_duplicate on a new hash triggers pruning
        _is_duplicate("fresh_hash")

        assert "stale_hash" not in _dedup_cache
        assert "fresh_hash" in _dedup_cache

    def teardown_method(self):
        _dedup_cache.clear()


class TestGetGitContext:
    """Test _get_git_context."""

    def test_returns_dict_with_branch_and_commit(self):
        """Git context always returns a dict with branch and commit keys."""
        ctx = _get_git_context()
        assert "branch" in ctx
        assert "commit" in ctx
        assert isinstance(ctx["branch"], str)
        assert isinstance(ctx["commit"], str)

    def test_git_context_fallback_on_failure(self):
        """When subprocess.run fails, returns 'unknown' for both fields."""
        with patch("subprocess.run", side_effect=OSError("git not found")):
            ctx = _get_git_context()
        assert ctx == {"branch": "unknown", "commit": "unknown"}


class TestCaptureError:
    """Test the main capture_error function."""

    def setup_method(self):
        _dedup_cache.clear()

    def test_duplicate_returns_none(self):
        """Second call with same exception is deduplicated."""
        try:
            _make_exception()
        except ValueError as e:
            # First call
            capture_error(e, source="test")
            # Second call — same hash, within dedup window
            result = capture_error(e, source="test")
            assert result is None

    def test_returns_none_when_feedback_disabled(self):
        """capture_error returns None immediately when error_feedback_enabled is False."""
        _dedup_cache.clear()

        import config

        original = config.settings.error_feedback_enabled
        try:
            config.settings.error_feedback_enabled = False
            try:
                raise RuntimeError("disabled test")
            except RuntimeError as e:
                result = capture_error(e, source="test")
            assert result is None
        finally:
            config.settings.error_feedback_enabled = original

    def test_capture_does_not_crash_on_missing_deps(self):
        """capture_error should never crash even if optional deps are missing."""
        _dedup_cache.clear()

        try:
            raise OSError("graceful test")
        except OSError as e:
            # Should not raise even though swarm/event_log don't exist
            capture_error(e, source="graceful")

    def test_capture_with_context_does_not_crash(self):
        """capture_error with context dict should not crash."""
        _dedup_cache.clear()

        try:
            raise RuntimeError("context test")
        except RuntimeError as e:
            capture_error(e, source="test_module", context={"path": "/api/foo"})

    def test_capture_creates_task_in_temp_db(self):
        """capture_error should write a task to the isolated temp DB, not production.

        This validates that conftest.clean_database properly redirects
        swarm.task_queue.models.DB_PATH to the per-test temp directory.
        """
        _dedup_cache.clear()

        try:
            raise ValueError("Test error for DB isolation check")
        except ValueError as e:
            task_id = capture_error(e, source="test")

        # task_id can be None if error_feedback_enabled is False — that's fine,
        # but if it was created, verify it landed in the temp DB
        if task_id:
            import swarm.task_queue.models as tq_models

            db_path = tq_models.DB_PATH
            conn = sqlite3.connect(str(db_path))
            try:
                row = conn.execute(
                    "SELECT id, title FROM tasks WHERE id = ?", (task_id,)
                ).fetchone()
                assert row is not None, (
                    f"Task {task_id} not found in DB at {db_path} — "
                    "check conftest.clean_database patches swarm.task_queue.models.DB_PATH"
                )
                assert "[BUG]" in row[1]
            finally:
                conn.close()

    def teardown_method(self):
        _dedup_cache.clear()