"""
Tests for the check-utcnow-parens pre-commit hook.

Verifies that the hook flags default=utcnow and onupdate=utcnow
(without parentheses) while allowing the correct default=utcnow()
and server_default=utcnow() patterns.
"""

import subprocess
import tempfile
from pathlib import Path


HOOK_SCRIPT = (
    Path(__file__).parent.parent.parent
    / ".pre-commit-hooks"
    / "check-utcnow-parens.py"
)


def _run_hook(content: str) -> subprocess.CompletedProcess:
    """Write content to a temp .py file and run the hook against it."""
    with tempfile.NamedTemporaryFile(suffix=".py", mode="w", delete=False) as f:
        f.write(content)
        f.flush()
        return subprocess.run(
            ["python", str(HOOK_SCRIPT), f.name],
            capture_output=True,
            text=True,
        )


# =========================================================================
# Should flag (exit code 1)
# =========================================================================


class TestFlagsIncorrectPatterns:
    """Patterns that must be caught by the hook."""

    def test_default_without_parens(self):
        result = _run_hook(
            "created_at = Column(UtcDateTime, default=utcnow, nullable=False)\n"
        )
        assert result.returncode == 1
        assert "utcnow without parentheses" in result.stdout

    def test_onupdate_without_parens(self):
        result = _run_hook(
            "updated_at = Column(UtcDateTime, onupdate=utcnow, nullable=False)\n"
        )
        assert result.returncode == 1
        assert "utcnow without parentheses" in result.stdout

    def test_both_default_and_onupdate_without_parens(self):
        result = _run_hook(
            "updated_at = Column(UtcDateTime, default=utcnow, onupdate=utcnow, nullable=False)\n"
        )
        assert result.returncode == 1
        assert "utcnow without parentheses" in result.stdout

    def test_default_without_parens_trailing_paren(self):
        """default=utcnow) — missing opening paren."""
        result = _run_hook("created_at = Column(UtcDateTime, default=utcnow)\n")
        assert result.returncode == 1

    def test_default_without_parens_multiline(self):
        result = _run_hook(
            "updated_at = Column(\n"
            "    UtcDateTime, default=utcnow, onupdate=utcnow, nullable=False\n"
            ")\n"
        )
        assert result.returncode == 1

    def test_default_with_spaces_around_equals(self):
        result = _run_hook(
            "created_at = Column(UtcDateTime, default = utcnow, nullable=False)\n"
        )
        assert result.returncode == 1


# =========================================================================
# Should pass (exit code 0)
# =========================================================================


class TestAllowsCorrectPatterns:
    """Patterns that must NOT be flagged."""

    def test_default_with_parens(self):
        result = _run_hook(
            "created_at = Column(UtcDateTime, default=utcnow(), nullable=False)\n"
        )
        assert result.returncode == 0

    def test_onupdate_with_parens(self):
        result = _run_hook(
            "updated_at = Column(UtcDateTime, onupdate=utcnow(), nullable=False)\n"
        )
        assert result.returncode == 0

    def test_server_default_with_parens(self):
        result = _run_hook(
            "created_at = Column(UtcDateTime, server_default=utcnow(), nullable=False)\n"
        )
        assert result.returncode == 0

    def test_both_with_parens(self):
        result = _run_hook(
            "updated_at = Column(UtcDateTime, default=utcnow(), onupdate=utcnow(), nullable=False)\n"
        )
        assert result.returncode == 0

    def test_no_utcnow_at_all(self):
        result = _run_hook("name = Column(String(100), nullable=False)\n")
        assert result.returncode == 0

    def test_utcnow_in_comment(self):
        """Comments mentioning utcnow() should not be flagged."""
        result = _run_hook(
            "# Note: created_at uses default=utcnow() in the model\n"
        )
        assert result.returncode == 0

    def test_utcnow_import(self):
        result = _run_hook("from sqlalchemy_utc import UtcDateTime, utcnow\n")
        assert result.returncode == 0

    def test_utcnow_assignment(self):
        """Direct assignment like existing_rating.created_at = utcnow()."""
        result = _run_hook("existing_rating.created_at = utcnow()\n")
        assert result.returncode == 0

    def test_empty_file(self):
        result = _run_hook("")
        assert result.returncode == 0


# =========================================================================
# Output format
# =========================================================================


class TestOutputFormat:
    """Verify the error messages include useful context."""

    def test_shows_filename_and_line(self):
        result = _run_hook(
            "x = 1\n"
            "created_at = Column(UtcDateTime, default=utcnow, nullable=False)\n"
        )
        assert result.returncode == 1
        assert ":2:" in result.stdout  # Line 2

    def test_shows_hint(self):
        result = _run_hook(
            "created_at = Column(UtcDateTime, default=utcnow, nullable=False)\n"
        )
        assert "Hint:" in result.stdout
        assert "SQL expression" in result.stdout
