from pathlib import Path

import pytest

import canned_prompts as cp


@pytest.fixture()
def package(tmp_path: Path) -> Path:
    pkg = tmp_path / "pkg"
    pkg.mkdir()
    (pkg / "prompt.yaml").write_text(
        """\
format: canned-prompt/v0.1
id: demo/hello
name: Hello
version: 1.0.0
summary: Say hello.
template: prompt.md
inputs:
  - name: person
    required: true
parameters:
  tone:
    type: enum
    values: [warm, formal]
    default: warm
""",
        encoding="utf-8",
    )
    (pkg / "prompt.md").write_text(
        "Say hello to {{ person }} in a {{ tone }} tone.\n", encoding="utf-8"
    )
    return pkg


def test_validate_and_render(package: Path) -> None:
    manifest = cp.validate_package(package)
    values = cp.resolve_values(manifest, {"person": "Ada"})
    rendered = cp.render_template((package / "prompt.md").read_text(), values)
    assert rendered == "Say hello to Ada in a warm tone.\n"


def test_missing_required_input_fails(package: Path) -> None:
    manifest = cp.validate_package(package)
    with pytest.raises(cp.CannedPromptError, match="missing required input"):
        cp.resolve_values(manifest, {})


def test_undeclared_placeholder_fails(package: Path) -> None:
    (package / "prompt.md").write_text("{{ missing }}\n", encoding="utf-8")
    with pytest.raises(cp.CannedPromptError, match="undeclared placeholders"):
        cp.validate_package(package)