import json
import os
import queue
import threading
from datetime import date
from unittest.mock import MagicMock, patch

import pytest
from garminconnect import GarminConnectAuthenticationError

import server


@pytest.fixture(autouse=True)
def reset_state():
    original_state = server._auth_state
    original_client = server._client
    for q in (server._mfa_input_queue, server._login_result_queue):
        while not q.empty():
            try:
                q.get_nowait()
            except queue.Empty:
                break
    yield
    server._auth_state = original_state
    server._client = original_client
    for q in (server._mfa_input_queue, server._login_result_queue):
        while not q.empty():
            try:
                q.get_nowait()
            except queue.Empty:
                break


def test_check_auth_unauthenticated():
    server._auth_state = "unauthenticated"
    assert server._check_auth() == "Not authenticated. Ask Claude to call authenticate() first."


def test_check_auth_authenticated():
    server._auth_state = "authenticated"
    assert server._check_auth() is None


def test_authenticate_success():
    env = {"GARMIN_EMAIL": "test@example.com", "GARMIN_PASSWORD": "secret"}
    with patch.dict("os.environ", env):
        with patch("server.Garmin") as mock_garmin_cls:
            mock_garmin_cls.return_value = MagicMock()
            # mock login() returns immediately, thread puts success in queue
            result = server.authenticate()
            assert result == "Authenticated successfully."
            assert server._auth_state == "authenticated"


def test_authenticate_mfa_required():
    env = {"GARMIN_EMAIL": "test@example.com", "GARMIN_PASSWORD": "secret"}
    with patch.dict("os.environ", env):
        with patch("server.Garmin") as mock_garmin_cls:
            mock_garmin_cls.return_value = MagicMock()
            with patch.object(server._login_result_queue, "get", side_effect=queue.Empty):
                result = server.authenticate()
        assert "MFA required" in result
        assert server._auth_state == "mfa_pending"


def test_complete_mfa_success():
    server._auth_state = "mfa_pending"
    server._login_result_queue.put(("success", None))
    result = server.complete_mfa("123456")
    assert result == "MFA accepted. Authenticated successfully."
    assert server._auth_state == "authenticated"
    assert server._mfa_input_queue.get_nowait() == "123456"


def test_complete_mfa_not_in_progress():
    server._auth_state = "unauthenticated"
    result = server.complete_mfa("123456")
    assert result == "No MFA in progress. Call authenticate() first."


def test_authenticate_missing_credentials():
    with patch.dict("os.environ", {}, clear=False):
        # Ensure the env vars are absent
        os.environ.pop("GARMIN_EMAIL", None)
        os.environ.pop("GARMIN_PASSWORD", None)
        result = server.authenticate()
    assert result == "GARMIN_EMAIL and GARMIN_PASSWORD environment variables are required."


def test_get_activities_unauthenticated():
    server._auth_state = "unauthenticated"
    assert "Not authenticated" in server.get_activities()


def test_get_activities_success():
    server._auth_state = "authenticated"
    server._client = MagicMock()
    server._client.get_activities_by_date.return_value = [
        {"activityId": "111", "activityType": {"typeKey": "running"}, "distance": 5000.0},
        {"activityId": "222", "activityType": {"typeKey": "cycling"}, "distance": 20000.0},
    ]
    result = server.get_activities("2026-05-01", "2026-05-17", 20)
    data = json.loads(result)
    assert len(data) == 2
    assert data[0]["activityId"] == "111"
    server._client.get_activities_by_date.assert_called_once_with("2026-05-01", "2026-05-17")


def test_get_activities_limit():
    server._auth_state = "authenticated"
    server._client = MagicMock()
    server._client.get_activities_by_date.return_value = [{"activityId": str(i)} for i in range(10)]
    data = json.loads(server.get_activities("2026-05-01", "2026-05-17", 3))
    assert len(data) == 3


def test_get_activities_defaults_to_today():
    server._auth_state = "authenticated"
    server._client = MagicMock()
    server._client.get_activities_by_date.return_value = []
    server.get_activities()
    today = date.today().isoformat()
    server._client.get_activities_by_date.assert_called_once_with(today, today)


def test_get_activities_auth_error():
    server._auth_state = "authenticated"
    server._client = MagicMock()
    server._client.get_activities_by_date.side_effect = GarminConnectAuthenticationError("auth")
    assert "Authentication error" in server.get_activities()


def test_get_activity_details_success():
    server._auth_state = "authenticated"
    server._client = MagicMock()
    server._client.get_activity_details.return_value = {"activityId": "111", "laps": []}
    data = json.loads(server.get_activity_details("111"))
    assert data["activityId"] == "111"
    server._client.get_activity_details.assert_called_once_with("111")


def test_get_activity_details_error():
    server._auth_state = "authenticated"
    server._client = MagicMock()
    server._client.get_activity_details.side_effect = Exception("not found")
    assert "Error fetching activity details" in server.get_activity_details("999")