"""Step definitions for session_list_error.feature (bug #554).

TDD regression tests for ``agents session list`` after ``agents init``.
These scenarios assert the correct expected behaviour and will fail until
the DI container fix is applied.

Design rationale
~~~~~~~~~~~~~~~~
``_get_session_service()`` calls ``container.db()`` but the DI ``Container``
class has no ``db`` provider, raising ``AttributeError``.

We reset ``_service`` to ``None`` so the real ``_get_session_service()`` is
exercised.  A file-based SQLite database and ``CLEVERAGENTS_DATABASE_URL``
override ensure the commands can reach the database once the fix lands.

Private API access
~~~~~~~~~~~~~~~~~~
This module accesses ``session_mod._service`` (module-level singleton cache)
to force the real ``_get_session_service()`` code path during tests.  This is
intentional: the public API (``CliRunner.invoke``) does not expose the DI
wiring that triggers the bug, so we must bypass the cache to exercise it.
"""

from __future__ import annotations

import json
import logging
import os
import shutil
import tempfile

import yaml
from behave import given, then, when
from behave.runner import Context
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker
from typer.testing import CliRunner

from cleveragents.application.container import reset_container
from cleveragents.application.services.session_service import (
    PersistentSessionService,
)
from cleveragents.cli.commands import session as session_mod
from cleveragents.cli.commands.session import app as session_app
from cleveragents.config.settings import Settings
from cleveragents.infrastructure.database.models import Base
from cleveragents.infrastructure.database.repositories import (
    SessionMessageRepository,
    SessionRepository,
)

runner = CliRunner()


# ---------------------------------------------------------------------------
# Helpers
# ---------------------------------------------------------------------------


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

    See ``tdd_session_shared_steps._suppress_structlog_stdout`` for the
    full rationale.
    """
    import structlog

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

    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)


def _setup_real_di_path(context: Context) -> None:
    """Prepare a temp dir with a fresh SQLite DB and override container."""
    # Store original _service so cleanup can restore it.
    context.sle_original_service = session_mod._service

    # Reset any stale DI container singleton before configuring the env var
    # so that cached providers don't carry over from a prior test suite (F17).
    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()
    context.sle_log_prev = (prev_level, prev_cache)

    context.sle_tmpdir = tempfile.mkdtemp(prefix="session_list_err_554_")

    # Register cleanup immediately after mkdtemp so the temp directory is
    # always removed even if the rest of setup fails (F21).
    context.add_cleanup(_cleanup_sle, context)

    context.sle_db_path = os.path.join(context.sle_tmpdir, "test.db")
    db_url = f"sqlite:///{context.sle_db_path}"

    # Create schema so the DB file exists with all tables.
    engine = create_engine(db_url, echo=False)
    try:
        Base.metadata.create_all(engine)
    finally:
        engine.dispose()

    # Override the container's database_url so real DI can find the DB.
    os.environ["CLEVERAGENTS_DATABASE_URL"] = db_url

    # Reset the module-level _service so _get_session_service() is used.
    # This direct attribute mutation is fragile — if the module's internal
    # caching mechanism changes (e.g. lazy singleton via descriptor), this
    # line will need to be updated.  See module docstring for rationale.
    session_mod._service = None

    context.sle_result = None


def _cleanup_sle(context: Context) -> None:
    """Remove temp dir, restore env, original _service, and container."""
    session_mod._service = context.sle_original_service
    os.environ.pop("CLEVERAGENTS_DATABASE_URL", None)

    # Reset the DI container singleton to avoid polluting later scenarios.
    reset_container()
    Settings._instance = None  # type: ignore[attr-defined]

    # Restore structlog / logging state.
    prev_level, prev_cache = context.sle_log_prev
    _restore_structlog(prev_level, prev_cache)

    shutil.rmtree(context.sle_tmpdir, ignore_errors=True)


# ---------------------------------------------------------------------------
# Background
# ---------------------------------------------------------------------------


@given("a session-list-error CLI runner using the real DI path")
def step_session_list_error_runner(context: Context) -> None:
    _setup_real_di_path(context)


# ---------------------------------------------------------------------------
# Given - pre-populated session
# ---------------------------------------------------------------------------


@given("a session-list-error service with a pre-populated session")
def step_pre_populate_session(context: Context) -> None:
    """Insert a session directly via the repository so list has data."""
    db_url = f"sqlite:///{context.sle_db_path}"
    engine = create_engine(db_url, echo=False)
    try:
        factory = sessionmaker(bind=engine, expire_on_commit=False)
        repo = SessionRepository(session_factory=factory, auto_commit=True)
        msg_repo = SessionMessageRepository(session_factory=factory, auto_commit=True)
        svc = PersistentSessionService(repo, msg_repo)
        svc.create(actor_name="openai/gpt-4")
    finally:
        engine.dispose()


# ---------------------------------------------------------------------------
# When - list
# ---------------------------------------------------------------------------


@when("I invoke session-list-error list with default format")
def step_invoke_list_default(context: Context) -> None:
    context.sle_result = runner.invoke(session_app, ["list"])


@when('I invoke session-list-error list with format "{fmt}"')
def step_invoke_list_format(context: Context, fmt: str) -> None:
    context.sle_result = runner.invoke(session_app, ["list", "--format", fmt])


# ---------------------------------------------------------------------------
# Then - assertions
# ---------------------------------------------------------------------------


@then("the session-list-error command should exit successfully")
def step_exit_success(context: Context) -> None:
    result = context.sle_result
    assert result is not None, "No command was invoked"
    assert result.exit_code == 0, (
        f"Expected exit code 0, got {result.exit_code}.\n"
        f"Output: {result.output}\n"
        f"Exception: {result.exception!r}"
    )


@then('the session-list-error output should contain "{text}"')
def step_output_contains(context: Context, text: str) -> None:
    result = context.sle_result
    assert result is not None, "No command was invoked"
    assert text in result.output, (
        f"Expected '{text}' in output but got:\n{result.output}"
    )


@then('the session-list-error output should not contain "{text}"')
def step_output_not_contains(context: Context, text: str) -> None:
    result = context.sle_result
    assert result is not None, "No command was invoked"
    assert text not in result.output, (
        f"Did not expect '{text}' in output but found it:\n{result.output}"
    )


@then('the session-list-error output should be valid JSON containing "{key}"')
def step_output_json_key(context: Context, key: str) -> None:
    result = context.sle_result
    assert result is not None, "No command was invoked"
    try:
        data = json.loads(result.output)
    except json.JSONDecodeError as exc:
        raise AssertionError(f"Output is not valid JSON:\n{result.output}") from exc
    assert isinstance(data, dict), f"Expected JSON object, got {type(data)}: {data}"
    assert key in data, f"Key '{key}' not in JSON: {data}"
    assert isinstance(data[key], list), (
        f"Expected '{key}' to be a list, got {type(data[key])}: {data[key]}"
    )


@then('the session-list-error output should be valid YAML containing "{key}"')
def step_output_yaml_key(context: Context, key: str) -> None:
    result = context.sle_result
    assert result is not None, "No command was invoked"
    try:
        data = yaml.safe_load(result.output)
    except yaml.YAMLError as exc:
        raise AssertionError(f"Output is not valid YAML:\n{result.output}") from exc
    assert isinstance(data, dict), f"Expected YAML dict, got {type(data)}: {data}"
    assert key in data, f"Key '{key}' not in YAML: {data}"
    assert isinstance(data[key], list), (
        f"Expected '{key}' to be a list, got {type(data[key])}: {data[key]}"
    )