"""Phase 6 TDD: HTML docs page at /muse/mists.

Tests are written RED first. Run before touching ui_docs.py and creating
the template to confirm failure, then implement.

Work:
1. Add 'mists' entry to _PHASES in ui_docs.py.
2. Add GET /muse/mists route handler.
3. Create musehub/templates/musehub/pages/docs_muse_mists.html.
4. Link /muse/mists from the /muse index page.

Tests operate against the live app client fixture (no DB state needed).
"""
from __future__ import annotations

import pytest
from httpx import AsyncClient


class TestDocsMistsPage:
    @pytest.mark.asyncio
    async def test_docs_mists_page_returns_200(self, client: AsyncClient) -> None:
        """GET /muse/mists must return 200 with text/html content-type."""
        r = await client.get("/muse/mists")
        assert r.status_code == 200, (
            f"Expected 200 from GET /muse/mists; got {r.status_code}"
        )
        assert "text/html" in r.headers.get("content-type", ""), (
            "Expected HTML response from /muse/mists"
        )

    @pytest.mark.asyncio
    async def test_docs_mists_page_contains_mist_keyword(
        self, client: AsyncClient
    ) -> None:
        """Page body must contain 'Mist' (the domain name)."""
        r = await client.get("/muse/mists")
        assert r.status_code == 200
        assert "Mist" in r.text, "Page must contain the keyword 'Mist'"

    @pytest.mark.asyncio
    async def test_docs_mists_page_contains_artifact_keyword(
        self, client: AsyncClient
    ) -> None:
        """Page body must contain 'artifact' (core Mist concept)."""
        r = await client.get("/muse/mists")
        assert r.status_code == 200
        assert "artifact" in r.text, "Page must contain the keyword 'artifact'"

    @pytest.mark.asyncio
    async def test_docs_mists_page_contains_content_addressed(
        self, client: AsyncClient
    ) -> None:
        """Page body must contain 'content-addressed'."""
        r = await client.get("/muse/mists")
        assert r.status_code == 200
        assert "content-addressed" in r.text, (
            "Page must contain the keyword 'content-addressed'"
        )

    @pytest.mark.asyncio
    async def test_docs_mists_page_contains_api_section(
        self, client: AsyncClient
    ) -> None:
        """Page must document the REST API surface (POST /api/mists etc.)."""
        r = await client.get("/muse/mists")
        assert r.status_code == 200
        assert "/api/mists" in r.text, (
            "Page must reference the /api/mists REST endpoint"
        )

    @pytest.mark.asyncio
    async def test_docs_mists_page_contains_security_section(
        self, client: AsyncClient
    ) -> None:
        """Page must cover the security model."""
        r = await client.get("/muse/mists")
        assert r.status_code == 200
        assert "security" in r.text.lower(), (
            "Page must contain a security section"
        )

    @pytest.mark.asyncio
    async def test_docs_mists_page_has_sidebar_nav(
        self, client: AsyncClient
    ) -> None:
        """Page must render the sidebar navigation present on all doc pages."""
        r = await client.get("/muse/mists")
        assert r.status_code == 200
        assert "devdocs-nav" in r.text, (
            "Page must include the devdocs sidebar nav (devdocs-nav class)"
        )


class TestDocsIndexLinksMists:
    @pytest.mark.asyncio
    async def test_docs_index_links_to_mists(self, client: AsyncClient) -> None:
        """GET /muse must contain a link to /muse/mists."""
        r = await client.get("/muse")
        assert r.status_code == 200
        assert "/muse/mists" in r.text, (
            "The /muse index page must link to /muse/mists"
        )

    @pytest.mark.asyncio
    async def test_docs_index_mists_entry_has_description(
        self, client: AsyncClient
    ) -> None:
        """The /muse index card for mists must include a non-empty description."""
        r = await client.get("/muse")
        assert r.status_code == 200
        # The index renders phase cards from _PHASES — each has a description.
        # Confirm the mists page is referenced alongside a meaningful description.
        assert "Mist" in r.text, (
            "The /muse index must mention 'Mist' in a nav card or description"
        )


class TestDocsMistsRouteRegistration:
    def test_mists_slug_in_phases_list(self) -> None:
        """'mists' slug must appear in the _PHASES list in ui_docs.py."""
        from musehub.api.routes.musehub.ui_docs import _PHASES
        slugs = [slug for slug, *_ in _PHASES]
        assert "mists" in slugs, (
            f"'mists' must be in _PHASES slugs; got {slugs}"
        )

    def test_docs_mists_route_exists(self) -> None:
        """The docs_mists route function must be defined in ui_docs."""
        import musehub.api.routes.musehub.ui_docs as _mod
        assert hasattr(_mod, "docs_mists"), (
            "ui_docs.py must define a 'docs_mists' route handler"
        )