"""Unit tests for the snippet serialize/parse helpers (pure functions, no DB)."""
from scribe.services import snippets as s


def test_compose_title_with_and_without_usage():
    assert s.compose_title("debounce", "rate-limit a callback") == "debounce — rate-limit a callback"
    assert s.compose_title("  debounce  ", "") == "debounce"
    assert s.compose_title("debounce") == "debounce"


def test_compose_tags_lowercases_language_and_dedups():
    assert s.compose_tags("Python", ["util", "python"]) == ["python", "snippet", "util"]
    assert s.compose_tags("", None) == ["snippet"]
    assert s.compose_tags("vue", ["snippet"]) == ["vue", "snippet"]


def test_compose_body_includes_fields_and_fence():
    body = s.compose_body(
        code="return 1", language="python", signature="f() -> int",
        when_to_use="always", repo="scribe", path="a.py", symbol="f",
    )
    assert "**When to use:** always" in body
    assert "**Signature:** `f() -> int`" in body
    assert "`scribe` · `a.py` · `f`" in body
    assert "```python\nreturn 1\n```" in body
    assert body.rstrip().endswith("```")


def test_compose_body_bare_code_only():
    body = s.compose_body(code="x = 1")
    assert body.strip() == "```\nx = 1\n```"


def test_parse_round_trips_a_composed_snippet():
    title = s.compose_title("useDebouncedRef", "debounce a reactive ref")
    body = s.compose_body(
        code="const x = 1", language="ts", signature="useDebouncedRef(v, ms)",
        when_to_use="debounce a reactive ref", repo="scribe",
        path="frontend/src/composables/x.ts", symbol="useDebouncedRef",
    )
    got = s.parse_snippet_fields(title, body, ["ts", "snippet"])
    assert got["name"] == "useDebouncedRef"
    assert got["when_to_use"] == "debounce a reactive ref"
    assert got["signature"] == "useDebouncedRef(v, ms)"
    assert got["language"] == "ts"
    assert got["code"] == "const x = 1"
    assert got["repo"] == "scribe"
    assert got["path"] == "frontend/src/composables/x.ts"
    assert got["symbol"] == "useDebouncedRef"


def test_parse_is_tolerant_of_plain_body():
    got = s.parse_snippet_fields("just a name", "no structure here", None)
    assert got["name"] == "just a name"
    assert got["when_to_use"] == ""
    assert got["signature"] == ""
    assert got["code"] == ""  # never raises on an unstructured body


def test_parse_falls_back_to_tag_for_language():
    got = s.parse_snippet_fields("n — u", "```\ncode\n```", ["ruby", "snippet"])
    assert got["language"] == "ruby"


def test_snippet_to_dict_includes_parsed_fields():
    class FakeNote:
        title = "debounce — rate-limit"
        body = "```js\ncode\n```\n"
        tags = ["js", "snippet"]

        def to_dict(self):
            return {"id": 1, "title": self.title, "note_type": "snippet", "tags": self.tags}

    data = s.snippet_to_dict(FakeNote())
    assert data["snippet"]["name"] == "debounce"
    assert data["snippet"]["language"] == "js"
    assert data["snippet"]["code"] == "code"