from dataclasses import dataclass, field
import math
from urllib.parse import urlsplit

import config


@dataclass(frozen=True)
class ResultPlatformSettings:
    # 完整的接收接口 URL，不假设正式平台的路径。
    url: str
    token: str = field(default="", repr=False)
    auth_header: str = "Authorization"
    auth_scheme: str = "Bearer"
    timeout: float = 30
    success_field: str = "code"
    success_values: tuple[str, ...] = ("0", "200")

    def __post_init__(self):
        parts = urlsplit(self.url)
        if (parts.scheme not in {"http", "https"} or not parts.netloc or parts.username
                or parts.password or parts.query or parts.fragment):
            raise ValueError("RESULT_PLATFORM_URL 必须是无内嵌凭证、查询串和片段的 HTTP(S) 接收接口地址")
        if self.auth_header and not self.token.strip():
            raise ValueError("结果平台鉴权需要 RESULT_PLATFORM_TOKEN；无鉴权接口应设置 RESULT_PLATFORM_AUTH_HEADER=none")
        if any("\r" in value or "\n" in value for value in (self.token, self.auth_header, self.auth_scheme)):
            raise ValueError("结果平台鉴权配置不能包含换行")
        if not math.isfinite(self.timeout) or self.timeout <= 0:
            raise ValueError("结果平台超时必须大于零")
        if not self.success_field or not self.success_values:
            raise ValueError("结果平台需要配置成功回执字段及成功值")

    @classmethod
    def from_config(cls):
        header = config.get_str("RESULT_PLATFORM_AUTH_HEADER", "Authorization").strip()
        scheme = config.get_str("RESULT_PLATFORM_AUTH_SCHEME", "Bearer").strip()
        return cls(
            url=config.get_str("RESULT_PLATFORM_URL").strip(),
            token=config.get_str("RESULT_PLATFORM_TOKEN"),
            auth_header="" if header.lower() == "none" else header,
            auth_scheme="" if scheme.lower() == "none" else scheme,
            timeout=config.get_float("RESULT_PLATFORM_TIMEOUT", 30),
            success_field=config.get_str("RESULT_PLATFORM_SUCCESS_FIELD", "code"),
            success_values=tuple(s.strip() for s in config.get_str("RESULT_PLATFORM_SUCCESS_VALUES", "0,200").split(",") if s.strip()),
        )