# Copyright 2024 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

from ipaddress import IPv4Address, IPv6Address

import yaml
from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware

from pydantic import BaseModel

from .routes import routes

class AppConfig(BaseModel):
    host: IPv4Address | IPv6Address = IPv4Address("127.0.0.1")
    port: int = 8080


def parse_config(path: str) -> AppConfig:
    with open(path, "r") as file:
        config = yaml.safe_load(file)
    return AppConfig(**config)


def init_app(cfg: AppConfig) -> FastAPI:
    app = FastAPI()
    
    app.add_middleware(
        CORSMiddleware,
        allow_origins=["*"],
        allow_credentials=True,
        allow_methods=["*"],
        allow_headers=["*"],
    )

    app.include_router(routes)

    return app