from __future__ import annotations

from collections import defaultdict
import unittest

from backend.startup_utils import (
    build_source_selftest_urls,
    clear_stale_ip_limits,
    run_source_selftest,
    warmup_timesfm,
)


class _FakeLogger:
    def __init__(self) -> None:
        self.infos: list[tuple[str, tuple[object, ...]]] = []
        self.warnings: list[tuple[str, tuple[object, ...]]] = []

    def info(self, msg: str, *args: object, **kwargs: object) -> None:
        self.infos.append((msg, args))

    def warning(self, msg: str, *args: object, **kwargs: object) -> None:
        self.warnings.append((msg, args))


class _FakeResponse:
    def __init__(self, status_code: int) -> None:
        self.status_code = status_code


class _FakeClient:
    def __init__(self, responses: dict[str, object]) -> None:
        self.responses = responses

    async def get(self, url: str) -> object:
        response = self.responses[url]
        if isinstance(response, Exception):
            raise response
        return response


class _FakeForecaster:
    def __init__(self, *, should_fail: bool = False) -> None:
        self.is_ready = not should_fail
        self.device = "cpu"
        self.should_fail = should_fail

    async def _lazy_load(self) -> None:
        if self.should_fail:
            raise RuntimeError("boom")


class StartupUtilsTests(unittest.IsolatedAsyncioTestCase):
    def test_clear_stale_ip_limits_removes_only_old_entries(self) -> None:
        ip_limits = defaultdict(list, {
            "fresh": [95.0],
            "stale": [1.0, 2.0],
        })
        removed = clear_stale_ip_limits(ip_limits, now=100.0, window_seconds=10)
        self.assertEqual(removed, 1)
        self.assertIn("fresh", ip_limits)
        self.assertNotIn("stale", ip_limits)

    def test_build_source_selftest_urls_includes_configured_keys(self) -> None:
        urls = dict(build_source_selftest_urls("td-key", "fh-key"))
        self.assertIn("apikey=td-key", urls["twelvedata"])
        self.assertIn("token=fh-key", urls["finnhub"])

    async def test_run_source_selftest_tracks_success_and_failure(self) -> None:
        logger = _FakeLogger()
        startup_sources: dict[str, dict[str, object]] = {}
        tests = [
            ("binance", "https://binance.test"),
            ("broken", "https://broken.test"),
        ]
        client = _FakeClient({
            "https://binance.test": _FakeResponse(200),
            "https://broken.test": RuntimeError("network down"),
        })

        await run_source_selftest(
            client=client,
            tests=tests,
            startup_sources=startup_sources,
            logger=logger,
            timestamp_provider=lambda: "2026-04-26T00:00:00+00:00",
        )

        self.assertEqual(startup_sources["binance"]["status_code"], 200)
        self.assertTrue(startup_sources["binance"]["reachable"])
        self.assertFalse(startup_sources["broken"]["reachable"])
        self.assertEqual(startup_sources["broken"]["error"], "network down")
        self.assertEqual(startup_sources["binance"]["checked_at"], "2026-04-26T00:00:00+00:00")

    async def test_warmup_timesfm_updates_success_state(self) -> None:
        logger = _FakeLogger()
        state = {"warming": False, "last_error": "old", "loaded": False, "device": "not_loaded"}
        forecaster = _FakeForecaster()

        await warmup_timesfm(
            forecaster=forecaster,
            startup_timesfm_state=state,
            logger=logger,
        )

        self.assertFalse(state["warming"])
        self.assertIsNone(state["last_error"])
        self.assertTrue(state["loaded"])
        self.assertEqual(state["device"], "cpu")

    async def test_warmup_timesfm_tracks_failure_state(self) -> None:
        logger = _FakeLogger()
        state = {"warming": False, "last_error": None, "loaded": True, "device": "not_loaded"}
        forecaster = _FakeForecaster(should_fail=True)

        await warmup_timesfm(
            forecaster=forecaster,
            startup_timesfm_state=state,
            logger=logger,
        )

        self.assertFalse(state["warming"])
        self.assertFalse(state["loaded"])
        self.assertEqual(state["device"], "cpu")
        self.assertEqual(state["last_error"], "boom")


if __name__ == "__main__":
    unittest.main()