from contextlib import contextmanager
from datetime import datetime, timezone
import json
from time import sleep
from urllib.parse import urlparse
import requests, base64, hashlib
from urllib.parse import urlparse
from cryptography.hazmat.primitives.serialization import load_pem_private_key
from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.primitives.asymmetric import padding

ACCT_NAME = "acct:blog@localhost:3000"

PRIV_KEY_PEM = """-----BEGIN PRIVATE KEY-----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-----END PRIVATE KEY-----"""


def ensure_follow(client, inbox_url, actor_url):
    req = sign(
        "POST",
        inbox_url,
        {
            "@context": "https://www.w3.org/ns/activitystreams",
            "id": "http://mock_masto:8000/d0b5768b-a15b-4ed6-bc84-84c7e2b57588",
            "type": "Follow",
            "actor": "http://mock_masto:8000/users/h4kor",
            "object": actor_url,
        },
    )
    resp = requests.Session().send(req)

    assert resp.status_code == 200


def sign(method, url, data):

    priv_key = load_pem_private_key(PRIV_KEY_PEM.encode(), None)
    body = json.dumps(data).encode()
    body_hash = hashlib.sha256(body).digest()
    digest = "SHA-256=" + base64.b64encode(body_hash).decode()
    date = datetime.now(tz=timezone.utc).strftime("%a, %d %b %Y %H:%M:%S GMT")
    host = "localhost:3000"
    target = urlparse(url).path
    to_sign = f"""(request-target): {method.lower()} {target}
host: {host}
date: {date}""".encode()
    sig = priv_key.sign(
        to_sign,
        padding.PKCS1v15(),
        hashes.SHA256(),
    )
    sig_str = base64.b64encode(sig).decode()

    request = requests.Request(method, url, data=body)
    request = request.prepare()
    request.headers["Content-Digest"] = digest
    request.headers["Host"] = host
    request.headers["Date"] = date
    request.headers["Signature"] = (
        f'keyId="http://mock_masto:8000/users/h4kor#main-key",headers="(request-target) host date",signature="{sig_str}"'
    )
    return request


@contextmanager
def msg_inc(n):
    resp = requests.get("http://localhost:8000/msgs")
    data = resp.json()
    msgs = len(data)
    yield
    sleep(0.2)
    resp = requests.get("http://localhost:8000/msgs")
    data = resp.json()
    assert msgs + n == len(
        data
    ), f"prev: {msgs}, now: {len(data)}, expected: {msgs + n}"