import time
from typing import Optional, TypeVar, Generic, Type

from fastapi import Request, Depends, HTTPException
from sqlalchemy.ext.asyncio import AsyncSession

from app.core.dependencies import db_getter
from app.api.v1.module_system.auth.schema import AuthSchema
from app.plugin.module_payment.apikey.service import TenantApiKeyService
from app.plugin.module_payment.apikey.schema import ApiKeyPayload


T = TypeVar("T")


class TenantApiKeyAuth(Generic[T]):
    """
    租户API Key认证
    """

    def __init__(self, data_type: Type[T], auto_error: bool = True):
        self.data_type: Type[T] = data_type
        self.auto_error: bool = auto_error

    async def __call__(
        self,
        request: Request,
        db: AsyncSession = Depends(db_getter)
    ) -> Optional[ApiKeyPayload[T]]:
        """
        验证API Key
        """
        # 记录请求开始时间
        request.state.start_time = time.time()

        # 获取 Authorization 头
        authorization = request.headers.get("Authorization", None)

        if not authorization:
            if self.auto_error:
                raise HTTPException(status_code=401, detail="Authorization header required")
            return None

        # 获取 Signature 头
        signature = request.headers.get("Signature", None)

        if not signature:
            if self.auto_error:
                raise HTTPException(status_code=401, detail="Signature header required")
            return None

        # ========================= 验证 ApiKey =========================

        # 检查是否为ApiKey认证
        if not authorization.startswith("ApiKey "):
            if self.auto_error:
                raise HTTPException(status_code=401, detail="Invalid authorization format")
            return None

        # 提取API Key和签名
        api_key = authorization[7:]
        # 创建AuthSchema对象
        temp_auth = AuthSchema(user=None, db=db, tenant_id=1, check_data_scope=False)

        # 验证API Key
        api_key_obj = await TenantApiKeyService.validate_api_key(temp_auth, api_key)
        if not api_key_obj:
            # await TenantApiKeyService.log_api_call(
            #     auth=temp_auth,
            #     api_key_id=None,
            #     tenant_id=temp_auth.tenant_id,
            #     endpoint=str(request.url.path),
            #     method=request.method,
            #     request_ip=request.client.host if request.client else "unknown",
            #     request_data=None,
            #     response_code=401,
            #     start_time=request.state.start_time,
            # )

            if self.auto_error:
                raise HTTPException(status_code=401, detail="Invalid API Key")
            return None

        # ========================= 验证 Signature =========================

        # 获取请求数据
        try:
            request_data = await request.json()
        except:
            request_data = {}

        if not TenantApiKeyService.verify_signature(api_key_obj.api_secret, request_data, signature):
            # await TenantApiKeyService.log_api_call(
            #     auth=temp_auth,
            #     api_key_id=api_key_obj.id,
            #     tenant_id=api_key_obj.tenant_id,
            #     endpoint=str(request.url.path),
            #     method=request.method,
            #     request_ip=request.client.host if request.client else "unknown",
            #     request_data=request_data,
            #     response_code=401,
            #     start_time=request.state.start_time,
            # )

            if self.auto_error:
                raise HTTPException(status_code=401, detail="Invalid Signature")
            return None

        await TenantApiKeyService.log_api_call(
            auth=temp_auth,
            api_key_id=api_key_obj.id,
            tenant_id=api_key_obj.tenant_id,
            endpoint=str(request.url.path),
            method=request.method,
            request_ip=request.client.host if request.client else "unknown",
            request_data=None,  # 避免记录敏感数据
            response_code=200,
            start_time=request.state.start_time,
        )

        # 更新最后使用时间
        await TenantApiKeyService.update_last_used(temp_auth, api_key_obj.id)

        # 将API Key对象存储到请求状态
        # request.state.api_key = api_key_obj
        # request.state.tenant_id = api_key_obj.tenant_id

        parsed_data = self.data_type(**request_data) if isinstance(request_data, dict) else request_data

        return ApiKeyPayload(
            api_key=api_key_obj.api_key,
            api_secret=api_key_obj.api_secret,
            tenant_id=api_key_obj.tenant_id,
            auth=AuthSchema(user=None, db=db, tenant_id=api_key_obj.tenant_id),
            data=parsed_data,
        )