"""
A group name is unique per owner account, case-insensitively — the group's
identity stays its UUID, this only makes `name@owner` a dependable handle.
"""

import base64
import hashlib

import pytest


def _auth_key(password: str, username: str) -> str:
    salt = hashlib.sha256(f"meshbay:auth:v1:{username}".encode()).digest()
    return base64.b64encode(
        hashlib.pbkdf2_hmac("sha512", password.encode(), salt, 600_000, 32)).decode()


async def _user(client, username, password="a-long-enough-passphrase"):
    await client.post("/v1/users/register", json={
        "username": username, "email": f"{username}@example.com",
        "auth_key": _auth_key(password, username)})
    r = await client.post("/v1/users/login", json={
        "username": username, "auth_key": _auth_key(password, username)})
    return {"Authorization": f"Bearer {r.json()['access_token']}"}


async def _create(client, headers, name):
    return await client.post("/v1/groups", json={"name": name}, headers=headers)


@pytest.mark.asyncio
async def test_same_owner_same_name_is_refused(client):
    alice = await _user(client, "alice_test")
    r1 = await _create(client, alice, "photos")
    assert r1.status_code == 201
    assert r1.json()["owner_username"] == "alice_test"

    r2 = await _create(client, alice, "photos")
    assert r2.status_code == 409
    assert "photos" in r2.json()["detail"]


@pytest.mark.asyncio
async def test_same_owner_different_case_is_refused(client):
    alice = await _user(client, "alice_test")
    assert (await _create(client, alice, "Photos")).status_code == 201
    assert (await _create(client, alice, "  photos ")).status_code == 409


@pytest.mark.asyncio
async def test_two_owners_may_share_a_name(client):
    alice = await _user(client, "alice_test")
    bob = await _user(client, "bob_test")
    assert (await _create(client, alice, "photos")).status_code == 201
    assert (await _create(client, bob, "photos")).status_code == 201


@pytest.mark.asyncio
async def test_name_is_trimmed_on_create(client):
    alice = await _user(client, "alice_test")
    r = await _create(client, alice, "  spaced out  ")
    assert r.status_code == 201
    assert r.json()["name"] == "spaced out"


@pytest.mark.asyncio
async def test_blank_name_is_refused(client):
    alice = await _user(client, "alice_test")
    assert (await _create(client, alice, "   ")).status_code == 422


@pytest.mark.asyncio
async def test_owner_username_is_reported_in_listings(client):
    alice = await _user(client, "alice_test")
    await _create(client, alice, "photos")

    mine = (await client.get("/v1/groups/mine", headers=alice)).json()["groups"]
    assert mine and mine[0]["owner_username"] == "alice_test"