from functools import lru_cache

from pydantic import Field
from pydantic_settings import BaseSettings, SettingsConfigDict


class Settings(BaseSettings):
    app_env: str = "local"
    app_name: str = "jr-agent-platform"
    log_level: str = "INFO"
    timezone: str = "Asia/Shanghai"
    jwt_issuer: str
    jwt_audience: str
    jwt_algorithm: str = "RS256"
    jwt_private_key_path: str = "config/jwt/jwt-private.pem"
    jwt_public_key_path: str = "config/jwt/jwt-public.pem"
    jwt_clock_skew_seconds: int = Field(default=30, ge=0)
    mysql_dsn: str
    mysql_pool_size: int = Field(default=5, ge=1)
    mysql_max_overflow: int = Field(default=10, ge=0)
    mysql_tx_isolation: str = "READ COMMITTED"
    redis_url: str
    redis_connect_timeout_seconds: float = Field(default=2, gt=0)
    message_broker_url: str = ""
    message_broker_run_topic: str = "agent.run"
    message_broker_outbox_topic: str = "agent.outbox"
    message_broker_dlq_topic: str = "agent.dlq"
    milvus_uri: str
    milvus_token: str = ""
    milvus_collection: str = "jr_memory"
    neo4j_uri: str
    neo4j_database: str = "neo4j"
    neo4j_username: str = "neo4j"
    neo4j_password: str = ""
    model_router_config_ref: str = "local"
    model_default_endpoint: str = ""
    model_fallback_endpoint: str = ""
    sse_heartbeat_seconds: int = Field(default=15, gt=0)
    sse_chunk_characters: int = Field(default=256, ge=1, le=4096)
    sse_max_connection_seconds: int = Field(default=300, gt=0)
    worker_lease_seconds: int = Field(default=60, gt=0)
    worker_retry_limit: int = Field(default=3, ge=0)
    worker_poll_seconds: float = Field(default=1, gt=0)

    model_config = SettingsConfigDict(env_file=".env", env_file_encoding="utf-8", extra="ignore")


@lru_cache(maxsize=1)
def get_settings() -> Settings:
    return Settings()  # type: ignore[call-arg]