#
# Copyright (c) 2021-2026 ahriman team.
#
# This file is part of ahriman
# (see https://github.com/arcan1s/ahriman).
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
import aiohttp_cors

from aiohttp.web import Application

from ahriman.core.configuration import Configuration


__all__ = ["setup_cors"]


def setup_cors(application: Application, configuration: Configuration) -> aiohttp_cors.CorsConfig:
    """
    setup CORS for the web application

    Args:
        application(Application): web application instance
        configuration(Configuration): configuration instance

    Returns:
        aiohttp_cors.CorsConfig: generated CORS configuration
    """
    allow_headers = configuration.getlist("web", "cors_allow_headers", fallback=[]) or "*"
    allow_methods = configuration.getlist("web", "cors_allow_methods", fallback=[]) or "*"
    expose_headers = configuration.getlist("web", "cors_expose_headers", fallback=[]) or "*"

    cors = aiohttp_cors.setup(application, defaults={
        origin: aiohttp_cors.ResourceOptions(  # type: ignore[no-untyped-call]
            expose_headers=expose_headers,
            allow_headers=allow_headers,
            allow_methods=allow_methods,
        )
        for origin in configuration.getlist("web", "cors_allow_origins", fallback=["*"])
    })
    for route in application.router.routes():
        cors.add(route)

    return cors
