"""YYB 支付协议常量、材料校验与脱敏指纹。

这里仅收敛已由成功请求验证的固定值，不负责推断或修改协议字段。
"""
from __future__ import annotations

import hashlib
import json
from pathlib import Path
from typing import Any


PAY_APPID = "1450243039"
PAY_GOODS_URL = "https://pay.qq.com/midas/minipay_v2/views/cpay/goods.shtml"
PAY_SAVE_URL = f"https://api.unipay.qq.com/v1/r/{PAY_APPID}/web_save"
PAY_PAGE_INFO_URL = f"https://api.unipay.qq.com/v1/r/{PAY_APPID}/web_page_info"
PAY_FP_URL = "https://api.unipay.qq.com/cgi-bin/fp-behv.fcg"
MALL_API_URL = "https://storeapi.pay.qq.com/api/CommonCallMpgo"

PAY_WEB_VERSION = "web_1.0.6"
PAY_WEBVERSION = "minipayv2"
DEFAULT_ORDER_PF = "mds_myappjp-__mds_myappjp_PC_aW9zd2hpdGVsaX0-android"
OLD_ENCRYPT_OFFERIDS = ("1450007826", "1110165571")

# 这两个 UA 分别来自已成功的 goods 和商城请求，不能因为版本不同而强行统一。
GOODS_USER_AGENT = (
    "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) "
    "AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Safari/537.36"
)
MALL_USER_AGENT = (
    "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) "
    "AppleWebKit/537.36 (KHTML, like Gecko) Chrome/151.0.0.0 Safari/537.36"
)


def _sha256_prefix_bytes(value: bytes) -> str:
    return hashlib.sha256(value).hexdigest()[:12]


def _json_fingerprint(value: Any) -> str:
    raw = json.dumps(value, ensure_ascii=False, separators=(",", ":")).encode("utf-8")
    return _sha256_prefix_bytes(raw)


def file_fingerprint(path: Path) -> str:
    """返回协议文件的短哈希，用于日志比对，不暴露内容。"""
    return _sha256_prefix_bytes(path.read_bytes())


def validate_goods_materials(args_template: list, xmidas: list[int] | None = None) -> None:
    """校验 goods webSave VM 所需静态表结构，发现升级时尽早失败。"""
    if not isinstance(args_template, list) or len(args_template) != 18:
        raise ValueError("goods args-template 必须是 18 槽数组")
    for index in (0, 1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15, 16):
        if not isinstance(args_template[index], list) or not args_template[index]:
            raise ValueError(f"goods args-template 槽 {index} 缺失")
    expected_lengths = {0: 16, 1: 256, 2: 256, 3: 256, 4: 256, 5: 256,
                        6: 16, 10: 528, 11: 1024, 12: 1024, 13: 256,
                        14: 256, 15: 256, 16: 256}
    for index, expected in expected_lengths.items():
        value = args_template[index][0]
        if not isinstance(value, list) or len(value) != expected:
            actual = len(value) if isinstance(value, list) else "非数组"
            raise ValueError(f"goods args-template 槽 {index} 长度异常: {actual} != {expected}")
    if xmidas is not None and len(xmidas) != 59640:
        raise ValueError(f"goods xMidasOps 长度异常: {len(xmidas)} != 59640")


def validate_mall_materials(transform_fixed: dict[str, Any]) -> None:
    """校验 mall 固定槽模板；动态槽仍由当前会话的 GetPayToken 填充。"""
    if not isinstance(transform_fixed, dict):
        raise ValueError("mall transform-fixed 必须是对象")
    required = {str(index) for index in (1, 2, 3, 4, 5, 7, 8, 9, 11, 12, 13, 14, 15, 16, 17)}
    missing = sorted(required - set(transform_fixed))
    if missing:
        raise ValueError(f"mall transform-fixed 缺少槽: {', '.join(missing)}")
    for index in required:
        if not isinstance(transform_fixed[index], list):
            raise ValueError(f"mall transform-fixed 槽 {index} 不是数组")


def goods_material_diagnostics(root: Path, args_template: list, xmidas: list[int]) -> dict[str, Any]:
    """构造脱敏协议指纹，便于区分页面升级和服务端业务拒绝。"""
    validate_goods_materials(args_template, xmidas)
    replay = root / "replay"
    return {
        "goods_xmidas_ops_length": len(xmidas),
        "args_template_slots": len(args_template),
        "args_template_sha256_prefix": _json_fingerprint(args_template),
        "bytecode_sha256_prefix": file_fingerprint(replay / "bytecode.json"),
        "constants_sha256_prefix": file_fingerprint(replay / "constants.json"),
        "web_version": PAY_WEB_VERSION,
    }