"""OpenAPI document tests: components, response schemas and Swagger UI."""
from __future__ import annotations

import unittest
from typing import Any, Dict, Tuple

from httpx import ASGITransport, AsyncClient

from kaya.openapi import schema_ref

from tavolo.app import app
from tavolo.platform.openapi import SCHEMAS
from tests.helpers import async_test

#: Methods documented for the application's own routes.
HTTP_METHODS = ("get", "post", "put", "patch", "delete", "options", "head")


class OpenApiDocumentTest(unittest.TestCase):
    async def _get(self, path: str) -> Any:
        transport = ASGITransport(app=app)
        async with AsyncClient(transport=transport, base_url="http://127.0.0.1") as client:
            response = await client.get(path)
        self.assertEqual(200, response.status_code)
        return response

    async def _spec(self) -> Dict[str, Any]:
        response = await self._get("/api/openapi.json")
        body: Dict[str, Any] = response.json()
        return body

    async def _schema(
        self, spec: Dict[str, Any], path: str, method: str, status: str
    ) -> Dict[str, Any]:
        schema: Dict[str, Any] = spec["paths"][path][method]["responses"][status][
            "content"
        ]["application/json"]["schema"]
        return schema

    @async_test
    async def test_components_registered(self) -> None:
        spec = await self._spec()
        self.assertEqual(SCHEMAS, spec["components"]["schemas"])

    @async_test
    async def test_every_api_response_documents_a_schema(self) -> None:
        spec = await self._spec()
        checked = 0
        for path, item in spec["paths"].items():
            if not path.startswith("/api/"):
                continue
            for method, operation in item.items():
                if method not in HTTP_METHODS:
                    continue
                for status, response in operation["responses"].items():
                    with self.subTest(path=path, method=method, status=status):
                        if status == "204":
                            # No content, so no schema either.
                            self.assertNotIn("content", response)
                            continue
                        self.assertIn("application/json", response["content"])
                        self.assertTrue(
                            response["content"]["application/json"]["schema"]
                        )
                        checked += 1
        self.assertGreater(checked, 0)

    @async_test
    async def test_response_schemas_reference_components(self) -> None:
        spec = await self._spec()
        cases: Tuple[Tuple[str, str, str, Dict[str, Any]], ...] = (
            ("/api/health", "get", "200", schema_ref("Health")),
            ("/api/me", "get", "200", schema_ref("Me")),
            ("/api/me", "get", "401", schema_ref("Error")),
            ("/api/auth/providers", "get", "200", schema_ref("AuthProvidersPage")),
            ("/api/game-types", "get", "200", schema_ref("GameTypesPage")),
            ("/api/games", "post", "201", schema_ref("Lobby")),
            ("/api/games/preview", "get", "200", schema_ref("GamePreview")),
            ("/api/games/{game_id}", "get", "200", schema_ref("GameView")),
            ("/api/games/{game_id}", "get", "404", schema_ref("Error")),
            ("/api/me/games", "get", "200", schema_ref("OngoingGamesPage")),
            ("/api/me/matches", "get", "200", schema_ref("MatchesPage")),
            ("/api/leaderboard", "get", "200", schema_ref("LeaderboardPage")),
            ("/api/me/ratings", "get", "200", schema_ref("RatingsPage")),
        )
        for path, method, status, expected in cases:
            with self.subTest(path=path, method=method, status=status):
                self.assertEqual(
                    expected, await self._schema(spec, path, method, status)
                )

    @async_test
    async def test_join_response_is_lobby_or_game_view(self) -> None:
        spec = await self._spec()
        schema = await self._schema(spec, "/api/games/join", "post", "200")
        self.assertEqual(
            {"anyOf": [schema_ref("Lobby"), schema_ref("GameView")]}, schema
        )

    @async_test
    async def test_component_nesting_and_nullability(self) -> None:
        spec = await self._spec()
        schemas = spec["components"]["schemas"]

        matches = schemas["MatchesPage"]["properties"]
        self.assertEqual(schema_ref("Match"), matches["results"]["items"])
        self.assertEqual(["string", "null"], matches["next_cursor"]["type"])

        match = schemas["Match"]["properties"]
        self.assertEqual(schema_ref("MatchPlayer"), match["players"]["items"])
        self.assertEqual(["integer", "null"], match["your_elo_delta"]["type"])

        lobby = schemas["Lobby"]
        self.assertEqual(schema_ref("LobbyPlayer"), lobby["properties"]["players"]["items"])
        self.assertIs(True, lobby["additionalProperties"])
        self.assertEqual(
            ["string", "null"],
            schemas["LobbyPlayer"]["properties"]["team"]["type"],
        )

        game_view = schemas["GameView"]
        self.assertEqual("boolean", game_view["properties"]["spectator"]["type"])
        self.assertIs(True, game_view["additionalProperties"])
        # The join code is optional (players only), so it is not required.
        self.assertNotIn("join_code", game_view["required"])

        board = schemas["LeaderboardPage"]
        self.assertEqual(["integer", "null"], board["properties"]["your_rank"]["type"])
        self.assertEqual(
            ["integer", "null"], board["properties"]["your_page"]["type"]
        )
        self.assertEqual(schema_ref("LeaderboardEntry"),
                         board["properties"]["results"]["items"])

    @async_test
    async def test_docs_serve_swagger_ui(self) -> None:
        response = await self._get("/api/docs")
        self.assertIn("text/html", response.headers["content-type"])
        self.assertIn("swagger-ui", response.text)