"""
Tests for backend/telegram.py: send_message, set_webhook, SignalAggregator.

NOTE: respx routes must be registered INSIDE the 'with mock:' block to be
intercepted properly.  Registering them before entering the context does not
activate the mock for new httpx.AsyncClient instances created at call time.
"""
from __future__ import annotations

import os

os.environ.setdefault("BOT_TOKEN", "test-bot-token")
os.environ.setdefault("CHAT_ID", "-1001234567890")
os.environ.setdefault("WEBHOOK_SECRET", "test-webhook-secret")
os.environ.setdefault("WEBHOOK_URL", "https://example.com/api/webhook/telegram")
os.environ.setdefault("FRONTEND_ORIGIN", "http://localhost:3000")

import aiosqlite

def _safe_aiosqlite_await(self):
    if not self._thread._started.is_set():
        self._thread.start()
    return self._connect().__await__()

aiosqlite.core.Connection.__await__ = _safe_aiosqlite_await  # type: ignore[method-assign]

import json
import os as _os
import tempfile
from unittest.mock import AsyncMock, patch

import httpx
import pytest
import respx

from backend import config
from backend.telegram import SignalAggregator, send_message, set_webhook


SEND_URL = f"https://api.telegram.org/bot{config.BOT_TOKEN}/sendMessage"
WEBHOOK_URL_API = f"https://api.telegram.org/bot{config.BOT_TOKEN}/setWebhook"


# ---------------------------------------------------------------------------
# send_message
# ---------------------------------------------------------------------------

@pytest.mark.asyncio
async def test_send_message_calls_telegram_api():
    """send_message POSTs to api.telegram.org/bot.../sendMessage."""
    with respx.mock(assert_all_called=False) as mock:
        route = mock.post(SEND_URL).mock(
            return_value=httpx.Response(200, json={"ok": True})
        )
        await send_message("hello world")

    assert route.called
    body = json.loads(route.calls[0].request.content)
    assert body["chat_id"] == config.CHAT_ID
    assert body["text"] == "hello world"


@pytest.mark.asyncio
async def test_send_message_handles_429():
    """On 429, send_message sleeps retry_after seconds then retries."""
    retry_after = 5
    responses = [
        httpx.Response(
            429,
            json={"ok": False, "parameters": {"retry_after": retry_after}},
        ),
        httpx.Response(200, json={"ok": True}),
    ]

    with respx.mock(assert_all_called=False) as mock:
        mock.post(SEND_URL).mock(side_effect=responses)
        with patch("backend.telegram.asyncio.sleep", new_callable=AsyncMock) as mock_sleep:
            await send_message("test 429")

    mock_sleep.assert_any_call(retry_after)


@pytest.mark.asyncio
async def test_send_message_5xx_retries():
    """On 5xx, send_message sleeps 30 seconds and retries once."""
    responses = [
        httpx.Response(500, text="Internal Server Error"),
        httpx.Response(200, json={"ok": True}),
    ]

    with respx.mock(assert_all_called=False) as mock:
        mock.post(SEND_URL).mock(side_effect=responses)
        with patch("backend.telegram.asyncio.sleep", new_callable=AsyncMock) as mock_sleep:
            await send_message("test 5xx")

    mock_sleep.assert_any_call(30)


# ---------------------------------------------------------------------------
# set_webhook
# ---------------------------------------------------------------------------

@pytest.mark.asyncio
async def test_set_webhook_calls_correct_endpoint():
    """set_webhook POSTs to setWebhook with url and secret_token."""
    with respx.mock(assert_all_called=False) as mock:
        route = mock.post(WEBHOOK_URL_API).mock(
            return_value=httpx.Response(200, json={"ok": True, "result": True})
        )
        await set_webhook(
            url="https://example.com/api/webhook/telegram",
            secret="my-secret",
        )

    assert route.called
    body = json.loads(route.calls[0].request.content)
    assert body["url"] == "https://example.com/api/webhook/telegram"
    assert body["secret_token"] == "my-secret"


@pytest.mark.asyncio
async def test_set_webhook_raises_on_result_false():
    """set_webhook raises RuntimeError when Telegram returns result=False."""
    with respx.mock(assert_all_called=False) as mock:
        mock.post(WEBHOOK_URL_API).mock(
            return_value=httpx.Response(200, json={"ok": True, "result": False})
        )
        with pytest.raises(RuntimeError, match="setWebhook failed"):
            await set_webhook(url="https://example.com/webhook", secret="s")


@pytest.mark.asyncio
async def test_set_webhook_raises_on_non_200():
    """set_webhook raises RuntimeError on non-200 response."""
    with respx.mock(assert_all_called=False) as mock:
        mock.post(WEBHOOK_URL_API).mock(
            return_value=httpx.Response(400, json={"ok": False})
        )
        with pytest.raises(RuntimeError, match="setWebhook failed"):
            await set_webhook(url="https://example.com/webhook", secret="s")


# ---------------------------------------------------------------------------
# SignalAggregator helpers
# ---------------------------------------------------------------------------

async def _init_db_with_tmp() -> str:
    """Init a temp-file DB and return its path."""
    from backend import config as _cfg, db as _db
    path = tempfile.mktemp(suffix=".db")
    _cfg.DB_PATH = path
    await _db.init_db()
    return path


def _cleanup(path: str) -> None:
    for ext in ("", "-wal", "-shm"):
        try:
            _os.unlink(path + ext)
        except FileNotFoundError:
            pass


# ---------------------------------------------------------------------------
# SignalAggregator tests
# ---------------------------------------------------------------------------

@pytest.mark.asyncio
async def test_aggregator_single_signal_calls_send_message():
    """Flushing an aggregator with one signal calls send_message once."""
    path = await _init_db_with_tmp()
    try:
        agg = SignalAggregator(interval=9999)
        await agg.add_signal(
            user_uuid="agg-uuid-001",
            user_name="Alice",
            timestamp=1742478000000,
            geo={"lat": 55.0, "lon": 37.0, "accuracy": 10.0},
            signal_id=1,
        )

        with respx.mock(assert_all_called=False) as mock:
            send_route = mock.post(SEND_URL).mock(
                return_value=httpx.Response(200, json={"ok": True})
            )
            with patch("backend.telegram.db.save_telegram_batch", new_callable=AsyncMock):
                with patch("backend.telegram.asyncio.sleep", new_callable=AsyncMock):
                    await agg.flush()

        assert send_route.call_count == 1
    finally:
        _cleanup(path)


@pytest.mark.asyncio
async def test_aggregator_multiple_signals_one_message():
    """5 signals flushed at once produce exactly one send_message call."""
    path = await _init_db_with_tmp()
    try:
        agg = SignalAggregator(interval=9999)
        for i in range(5):
            await agg.add_signal(
                user_uuid=f"agg-uuid-{i:03d}",
                user_name=f"User{i}",
                timestamp=1742478000000 + i * 1000,
                geo=None,
                signal_id=i + 1,
            )

        with respx.mock(assert_all_called=False) as mock:
            send_route = mock.post(SEND_URL).mock(
                return_value=httpx.Response(200, json={"ok": True})
            )
            with patch("backend.telegram.db.save_telegram_batch", new_callable=AsyncMock):
                with patch("backend.telegram.asyncio.sleep", new_callable=AsyncMock):
                    await agg.flush()

        assert send_route.call_count == 1
    finally:
        _cleanup(path)


@pytest.mark.asyncio
async def test_aggregator_empty_buffer_no_send():
    """Flushing an empty aggregator must NOT call send_message."""
    agg = SignalAggregator(interval=9999)

    # No routes registered — if a POST is made it will raise AllMockedAssertionError
    with respx.mock(assert_all_called=False) as mock:
        send_route = mock.post(SEND_URL).mock(
            return_value=httpx.Response(200, json={"ok": True})
        )
        await agg.flush()

    assert send_route.call_count == 0


@pytest.mark.asyncio
async def test_aggregator_buffer_cleared_after_flush():
    """After flush, the aggregator buffer is empty."""
    path = await _init_db_with_tmp()
    try:
        agg = SignalAggregator(interval=9999)
        await agg.add_signal(
            user_uuid="agg-uuid-clr",
            user_name="Test",
            timestamp=1742478000000,
            geo=None,
            signal_id=99,
        )
        assert len(agg._buffer) == 1

        with respx.mock(assert_all_called=False) as mock:
            mock.post(SEND_URL).mock(return_value=httpx.Response(200, json={"ok": True}))
            with patch("backend.telegram.db.save_telegram_batch", new_callable=AsyncMock):
                with patch("backend.telegram.asyncio.sleep", new_callable=AsyncMock):
                    await agg.flush()

        assert len(agg._buffer) == 0
    finally:
        _cleanup(path)


@pytest.mark.asyncio
async def test_aggregator_unknown_user_shows_uuid_prefix():
    """If user_name is None, the message shows first 8 chars of uuid."""
    path = await _init_db_with_tmp()
    try:
        agg = SignalAggregator(interval=9999)
        test_uuid = "abcdef1234567890"
        await agg.add_signal(
            user_uuid=test_uuid,
            user_name=None,
            timestamp=1742478000000,
            geo=None,
            signal_id=1,
        )

        sent_texts: list[str] = []

        async def _fake_send(text: str) -> None:
            sent_texts.append(text)

        with patch("backend.telegram.send_message", side_effect=_fake_send):
            with patch("backend.telegram.db.save_telegram_batch", new_callable=AsyncMock):
                with patch("backend.telegram.asyncio.sleep", new_callable=AsyncMock):
                    await agg.flush()

        assert len(sent_texts) == 1
        assert test_uuid[:8] in sent_texts[0]
    finally:
        _cleanup(path)