"""
应用工厂：创建和配置 FastAPI 应用实例。
"""
import redis
from fastapi import FastAPI
from views import lifespan
from foundation.infrastructure.config.config import config_handler
from server.celery_manager import CeleryWorkerManager


class ServerUtils:
    """Redis 连接工具。"""

    @staticmethod
    def get_redis_connection():
        redis_host = config_handler.get('redis', 'REDIS_HOST', 'localhost')
        redis_port = config_handler.get('redis', 'REDIS_PORT', '6379')
        redis_password = config_handler.get('redis', 'REDIS_PASSWORD', '')
        redis_db = config_handler.get('redis', 'REDIS_DB', '0')
        if redis_password:
            redis_url = f'redis://:{redis_password}@{redis_host}:{redis_port}/{redis_db}'
        else:
            redis_url = f'redis://{redis_host}:{redis_port}/{redis_db}'
        return redis.from_url(redis_url, decode_responses=True)


class ApplicationFactory:
    """应用工厂。"""

    def __init__(self):
        self.server_utils = ServerUtils()
        self.celery_manager = CeleryWorkerManager(self.server_utils)

    def create_app(self) -> FastAPI:
        from server.routes import register_routes
        app = FastAPI(
            title="Agent API - 施工方案审查系统",
            version="0.3",
            description="Agent API - 集成施工方案审查功能",
            lifespan=lifespan,
        )
        register_routes(app)
        return app

    def create_server_config(self) -> dict:
        port = config_handler.get('launch', 'LAUNCH_PORT', 8002)
        try:
            port = int(port)
        except (ValueError, TypeError):
            port = 8002
        return {
            'host': config_handler.get('launch', 'HOST', '0.0.0.0'),
            'port': port,
            'reload': False,
            'with_celery': True,
        }