"""Тесты TTL-кеша шаблонов из БД (Блок 4.5): кеш, фолбэк и ошибки БД."""

from __future__ import annotations

from common.texts import TEMPLATES
from common.texts.store import TemplateStore


async def test_uses_db_values() -> None:
    async def loader() -> dict[str, str]:
        return {"info.help": "текст из БД"}

    store = TemplateStore(loader=loader, ttl=60)

    assert await store.get("info.help") == "текст из БД"


async def test_falls_back_to_code_for_missing_key() -> None:
    async def loader() -> dict[str, str]:
        return {"info.help": "текст из БД"}

    store = TemplateStore(loader=loader, ttl=60)

    assert await store.get("economy.top") == TEMPLATES["economy.top"]


async def test_falls_back_when_db_unavailable() -> None:
    async def loader() -> dict[str, str]:
        raise RuntimeError("БД недоступна")

    store = TemplateStore(loader=loader, ttl=60)

    assert await store.get("info.help") == TEMPLATES["info.help"]


async def test_caches_within_ttl() -> None:
    calls = 0

    async def loader() -> dict[str, str]:
        nonlocal calls
        calls += 1
        return {"info.help": f"v{calls}"}

    store = TemplateStore(loader=loader, ttl=60)

    assert await store.get("info.help") == "v1"
    assert await store.get("info.help") == "v1"
    assert calls == 1


async def test_reloads_when_cache_expired() -> None:
    calls = 0

    async def loader() -> dict[str, str]:
        nonlocal calls
        calls += 1
        return {"info.help": f"v{calls}"}

    store = TemplateStore(loader=loader, ttl=0)

    assert await store.get("info.help") == "v1"
    assert await store.get("info.help") == "v2"


async def test_clear_forces_reload() -> None:
    calls = 0

    async def loader() -> dict[str, str]:
        nonlocal calls
        calls += 1
        return {"info.help": f"v{calls}"}

    store = TemplateStore(loader=loader, ttl=600)
    assert await store.get("info.help") == "v1"

    store.clear()

    assert await store.get("info.help") == "v2"


async def test_failed_load_is_not_retried_on_every_call() -> None:
    calls = 0

    async def loader() -> dict[str, str]:
        nonlocal calls
        calls += 1
        raise RuntimeError("БД недоступна")

    store = TemplateStore(loader=loader, ttl=60)

    assert await store.get("info.help") == TEMPLATES["info.help"]
    assert await store.get("info.help") == TEMPLATES["info.help"]
    assert calls == 1