import io

import pytest
import responses

from client.config import load_config
from client.pair import pair


@responses.activate
def test_pair_posts_to_api_pair_and_writes_config(tmp_path, monkeypatch):
    monkeypatch.setenv("HOME", str(tmp_path))
    responses.post(
        "https://backend.test/api/pair",
        json={
            "device_id": "00000000-0000-0000-0000-000000000001",
            "device_token": "T0K3N",
            "backend_ws": "wss://backend.test/device",
        },
        status=200,
    )

    pair(backend="https://backend.test", code="ABC12345", hostname="testhost")

    cfg = load_config()
    assert cfg.device_id == "00000000-0000-0000-0000-000000000001"
    assert cfg.device_token == "T0K3N"
    assert cfg.backend_ws == "wss://backend.test/device"

    body = responses.calls[0].request.body
    assert b"ABC12345" in body
    assert b"testhost" in body


@responses.activate
def test_pair_strips_trailing_slash_from_backend(tmp_path, monkeypatch):
    monkeypatch.setenv("HOME", str(tmp_path))
    responses.post(
        "https://backend.test/api/pair",
        json={"device_id": "x", "device_token": "y", "backend_ws": "wss://z"},
        status=200,
    )
    pair(backend="https://backend.test/", code="ABC12345", hostname="h")
    assert responses.calls[0].request.url == "https://backend.test/api/pair"


@responses.activate
def test_pair_raises_on_404(tmp_path, monkeypatch):
    monkeypatch.setenv("HOME", str(tmp_path))
    responses.post(
        "https://backend.test/api/pair",
        json={"error": "code invalid or expired"},
        status=404,
    )
    with pytest.raises(SystemExit) as exc:
        pair(backend="https://backend.test", code="WRONGCOD", hostname="h")
    assert "code invalid or expired" in str(exc.value)


def test_prompt_used_when_code_not_provided(tmp_path, monkeypatch):
    monkeypatch.setenv("HOME", str(tmp_path))
    monkeypatch.setattr("sys.stdin", io.StringIO("FROMSTDIN\n"))

    called_with = {}

    def fake_post(url, json, timeout):
        called_with["json"] = json

        class R:
            status_code = 200

            def json(self_):
                return {
                    "device_id": "x",
                    "device_token": "y",
                    "backend_ws": "wss://z",
                }

            def raise_for_status(self_):
                pass

        return R()

    monkeypatch.setattr("client.pair.requests.post", fake_post)
    pair(backend="https://backend.test", code=None, hostname="h")
    assert called_with["json"]["code"] == "FROMSTDIN"