from pathlib import Path

import pytest

from personal_mcp.prompts.content import load_prompt_definition
from personal_mcp.prompts.content import render_prompt

pytestmark = pytest.mark.unit


class TestPromptContentRenderer:
    def test_renders_arguments_without_frontmatter(self) -> None:
        rendered = render_prompt(
            "jsfiddle-page-layout",
            {"domain": "public library", "layout_brief": None},
        )

        assert not rendered.startswith("---")
        assert "`domain`: public library" in rendered
        assert "`layout_brief`: Not provided" in rendered

    def test_rejects_placeholder_drift(self) -> None:
        with pytest.raises(ValueError, match="placeholders do not match arguments"):
            render_prompt("jsfiddle-page-layout", {"domain": "public library"})

    def test_rejects_invalid_prompt_id(self) -> None:
        with pytest.raises(ValueError, match="lowercase kebab-case"):
            render_prompt("../outside", {})

    def test_rejects_missing_prompt_metadata(self, tmp_path: Path) -> None:
        document = tmp_path / "PROMPT.md"
        document.write_text("---\nicon: lucide/messages-square\n---\n\n# Body\n", encoding="utf-8")

        with pytest.raises(ValueError, match="missing the 'prompt' block"):
            load_prompt_definition("demo", document)

    def test_rejects_unknown_prompt_metadata(self, tmp_path: Path) -> None:
        document = tmp_path / "PROMPT.md"
        document.write_text(
            "---\nprompt: {version: '1', description: Demo, tags: [demo], arguments: {}, unknown: true}\n"
            "---\n\n# Body\n",
            encoding="utf-8",
        )

        with pytest.raises(ValueError, match="Extra inputs are not permitted"):
            load_prompt_definition("demo", document)

    def test_rejects_declared_placeholder_drift(self, tmp_path: Path) -> None:
        document = tmp_path / "PROMPT.md"
        document.write_text(
            "---\nprompt: {version: '1', description: Demo, tags: [demo], arguments: "
            "{topic: {description: Topic, required: true}}}\n---\n\n# Body\n",
            encoding="utf-8",
        )

        with pytest.raises(ValueError, match="placeholders do not match arguments"):
            load_prompt_definition("demo", document)