from functools import lru_cache
from urllib.parse import parse_qsl, urlencode, urlsplit, urlunsplit
from pydantic import Field
from pydantic_settings import BaseSettings, SettingsConfigDict


class Settings(BaseSettings):
    database_url: str = Field(default="postgresql://miniapp:miniapp_dev_password@localhost:5433/miniapp")
    jwt_secret: str = Field(default="dev-only-change-me-before-production")
    jwt_expires_hours: int = Field(default=8)
    log_level: str = Field(default="info")
    port: int = Field(default=4000)
    cors_origins: str = Field(default="*")
    oss_access_key_id: str | None = Field(default=None)
    oss_access_key_secret: str | None = Field(default=None)
    oss_endpoint: str | None = Field(default=None)
    oss_bucket_name: str | None = Field(default=None)
    wechat_miniapp_appid: str | None = Field(default=None)
    wechat_miniapp_secret: str | None = Field(default=None)
    customer_jwt_expires_hours: int = Field(default=720)

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

    @property
    def sqlalchemy_url(self) -> str:
        parsed = urlsplit(self.database_url)
        query = urlencode([(key, value) for key, value in parse_qsl(parsed.query, keep_blank_values=True) if key != "schema"])
        normalized = urlunsplit((parsed.scheme, parsed.netloc, parsed.path, query, parsed.fragment))
        if normalized.startswith("postgresql://"):
            return normalized.replace("postgresql://", "postgresql+psycopg://", 1)
        return normalized


@lru_cache
def get_settings() -> Settings:
    return Settings()