"""Shared pytest configuration for the procurement-ingest test suite.

The Lambda handlers create boto3 clients at module import time, so a
region and dummy credentials must be present in the environment before
any handler module is imported. Setting them here at conftest import
time guarantees they exist before test collection touches a handler.
"""

import importlib.util
import os
import sys
from pathlib import Path

import pytest

os.environ.setdefault("AWS_DEFAULT_REGION", "us-east-1")
os.environ.setdefault("AWS_ACCESS_KEY_ID", "testing")
os.environ.setdefault("AWS_SECRET_ACCESS_KEY", "testing")
os.environ.setdefault("AWS_SESSION_TOKEN", "testing")

REPO_ROOT = Path(__file__).resolve().parents[1]


def load_handler(relative_path, module_name):
    """Load a Lambda handler module by file path under a unique name.

    The handler files all share the basename ``handler.py`` and are not
    importable as packages, so a plain ``import handler`` would collide
    across Lambdas.
    """
    path = REPO_ROOT / relative_path
    spec = importlib.util.spec_from_file_location(module_name, path)
    module = importlib.util.module_from_spec(spec)
    sys.modules[module_name] = module
    spec.loader.exec_module(module)
    return module


@pytest.fixture(scope="session")
def po_handler():
    """The PO email processor handler module."""
    return load_handler(
        "lambdas/po/email_processor/handler.py",
        "po_email_processor_handler",
    )


@pytest.fixture(scope="session")
def wo_handler():
    """The WO email processor handler module."""
    return load_handler(
        "lambdas/wo/email_processor/handler.py",
        "wo_email_processor_handler",
    )


@pytest.fixture(params=["po_handler", "wo_handler"])
def email_handler(request):
    """Parametrized fixture yielding each email processor handler module."""
    return request.getfixturevalue(request.param)