"""Shared step definitions for TDD session DI bug tests.

Steps in this module are used by both ``tdd_session_create_di.feature`` and
``tdd_session_list_di.feature``.  Behave loads all step files globally, so
placing shared steps here avoids duplication and satisfies the CONTRIBUTING.md
rule that feature-specific steps live in matching ``*_steps.py`` files while
shared steps live in clearly named reusable modules.
"""

from __future__ import annotations

import json
import logging
import os
import tempfile
from pathlib import Path

from behave import given, then
from behave.runner import Context
from typer.testing import CliRunner

from cleveragents.application.container import reset_container
from cleveragents.cli.commands import session as session_mod
from cleveragents.config.settings import Settings


def _suppress_structlog_stdout() -> tuple[int, bool]:
    """Prevent structlog debug lines from contaminating CLI stdout.

    When ``behave-parallel`` runs multiple features in one process,
    another feature may (re)configure structlog with a ``ConsoleRenderer``
    or leave it at the default ``PrintLogger`` — both write to
    ``sys.stdout``.  The ``@database_retry`` decorator logs a *debug*
    event on every attempt, and ``CliRunner.invoke()`` captures
    ``sys.stdout``, so those debug lines end up in the captured output,
    breaking JSON/YAML assertions.

    Returns the previous root-logger level and ``cache_logger_on_first_use``
    flag so that the caller's cleanup function can restore them.
    """
    import structlog

    root = logging.getLogger()
    prev_level = root.level
    root.setLevel(logging.CRITICAL)

    # Force structlog to route through stdlib logging (not PrintLogger)
    # and disable logger caching so the level change takes effect for
    # loggers that were already instantiated.
    prev_config = structlog.get_config()
    prev_cache: bool = prev_config.get("cache_logger_on_first_use", True)  # type: ignore[assignment]
    structlog.configure(
        logger_factory=structlog.stdlib.LoggerFactory(),
        wrapper_class=structlog.stdlib.BoundLogger,
        cache_logger_on_first_use=False,
    )

    return prev_level, prev_cache


def _restore_structlog(prev_level: int, prev_cache: bool) -> None:
    """Undo the suppression applied by :func:`_suppress_structlog_stdout`."""
    import structlog

    logging.getLogger().setLevel(prev_level)
    structlog.configure(cache_logger_on_first_use=prev_cache)


@given("a CLI runner using the real session DI path")
def step_real_di_runner(context: Context) -> None:
    """Set up a CLI runner that does NOT mock the session service.

    By ensuring ``session_mod._service`` is ``None``, the CLI will call
    ``_get_session_service()`` which hits the real DI container and
    resolves the ``session_service`` provider.
    """
    context.runner = CliRunner()

    # Ensure we go through the real DI path — no mock service.
    session_mod._service = None

    # Reset singletons before setup so stale state from a parallel
    # scenario does not leak in.
    reset_container()
    Settings._instance = None  # type: ignore[attr-defined]

    # Suppress structlog debug output so CliRunner captures clean output.
    prev_level, prev_cache = _suppress_structlog_stdout()

    # Provide a database URL so the container can be constructed.
    fd, db_path = tempfile.mkstemp(suffix=".db")
    os.close(fd)
    context._tdd_db_path = db_path

    db_url = f"sqlite:///{db_path}"
    os.environ["CLEVERAGENTS_DATABASE_URL"] = db_url

    # Create the schema so the database file is ready for use.
    from sqlalchemy import create_engine

    from cleveragents.infrastructure.database.models import Base

    engine = create_engine(db_url, echo=False)
    try:
        Base.metadata.create_all(engine)
    finally:
        engine.dispose()

    def _cleanup() -> None:
        session_mod._service = None
        os.environ.pop("CLEVERAGENTS_DATABASE_URL", None)
        reset_container()
        # Reset the Settings singleton so stale database URLs from this
        # scenario do not leak into subsequent scenarios.
        Settings._instance = None  # type: ignore[attr-defined]
        Path(db_path).unlink(missing_ok=True)
        _restore_structlog(prev_level, prev_cache)

    context.add_cleanup(_cleanup)


@then("the session {subcommand} command should exit successfully")
def step_session_exits_ok(context: Context, subcommand: str) -> None:
    """Assert the command exits with code 0."""
    assert context.result.exit_code == 0, (
        f"Expected exit code 0, got {context.result.exit_code}.\n"
        f"Output:\n{context.result.output}"
    )


@then("the session {subcommand} output should be valid JSON")
def step_session_output_json(context: Context, subcommand: str) -> None:
    """Assert the output is parseable JSON."""
    try:
        json.loads(context.result.output)
    except json.JSONDecodeError as exc:
        raise AssertionError(
            f"Output is not valid JSON:\n{context.result.output}"
        ) from exc