import json
import minio
import requests
from typing import Dict, Optional, Any

class SandcrawlerPostgrestClient():

    def __init__(self, api_url: str):
        self.api_url = api_url
        
    def get_grobid(self, sha1: str) -> Optional[Dict[str, Any]]:
        resp = requests.get(self.api_url + "/grobid", params=dict(sha1hex='eq.'+sha1))
        resp.raise_for_status()
        resp_json = resp.json()
        if resp_json:
            return resp_json[0]
        else:
            return None


class SandcrawlerMinioClient(object):

    def __init__(self, host_url: str, access_key: Optional[str] = None, secret_key: Optional[str] = None, default_bucket: Optional[str] = "sandcrawler"):
        """
        host is minio connection string (host:port)
        access and secret key are as expected
        default_bucket can be supplied so that it doesn't need to be repeated for each function call

        Example config:

            host="localhost:9000",
            access_key=os.environ['MINIO_ACCESS_KEY'],
            secret_key=os.environ['MINIO_SECRET_KEY'],
        """
        self.mc = minio.Minio(
            host_url,
            access_key=access_key,
            secret_key=secret_key,
            secure=False,
        )
        self.default_bucket = default_bucket

    def _blob_path(self, folder, sha1hex, extension, prefix):
        if not extension:
            extension = ""
        if not prefix:
            prefix = ""
        assert len(sha1hex) == 40
        obj_path = "{}{}/{}/{}/{}{}".format(
            prefix,
            folder, 
            sha1hex[0:2],
            sha1hex[2:4],
            sha1hex,
            extension,
        )
        return obj_path 

    def get_blob(self, folder, sha1hex, extension="", prefix="", bucket=None):
        """
        sha1hex is sha1 of the blob itself

        Fetched blob from the given bucket/folder, using the sandcrawler SHA1 path convention
        """
        obj_path = self._blob_path(folder, sha1hex, extension, prefix)
        if not bucket:
            bucket = self.default_bucket
        assert bucket
        blob = self.mc.get_object(
            bucket,
            obj_path,
        )
        # TODO: optionally verify SHA-1?
        return blob.data