from __future__ import annotations

import json
from pathlib import Path

import pytest
from fastapi.testclient import TestClient

from world_simulator.api.gradio_app import create_gradio_app


def test_gradio_app_exposes_game_api(tmp_path: Path) -> None:
    config_path = _write_config(tmp_path)
    app = create_gradio_app(config_path=config_path, static_dir=tmp_path / "dist")
    client = TestClient(app)

    health = client.get("/health")
    assert health.status_code == 200
    assert health.json()["status"] == "ok"

    snapshot = client.get("/scene/state?warmup=1")
    assert snapshot.status_code == 200
    assert snapshot.json()["terrain"]["kind"] == "plain_green"

    tick = client.post("/tick")
    assert tick.status_code == 200
    assert tick.json()["tick"] == 1


def test_gradio_app_serves_missing_frontend_page(tmp_path: Path) -> None:
    config_path = _write_config(tmp_path)
    app = create_gradio_app(config_path=config_path, static_dir=tmp_path / "missing-dist")
    client = TestClient(app)

    response = client.get("/world")

    assert response.status_code == 503
    assert "frontend is not built" in response.text

    # The public lobby is served directly at the root path.
    lobby = client.get("/")
    assert lobby.status_code == 200


def test_gradio_app_force_deterministic_disables_modal_runtime(
    tmp_path: Path,
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    monkeypatch.setenv("WORLD_SIMULATOR_FORCE_DETERMINISTIC", "1")
    config_path = _write_modal_config(tmp_path)
    app = create_gradio_app(config_path=config_path, static_dir=tmp_path / "dist")
    client = TestClient(app)

    health = client.get("/health")
    assert health.status_code == 200
    assert health.json()["simulator"] == "deterministic"

    snapshot = client.get("/scene/state?warmup=1")
    assert snapshot.status_code == 200
    assert snapshot.json()["simulation"]["models"] == []

    god_command = client.post("/god-command", json={"command": "make Ada happy"})
    assert god_command.status_code == 404


def _write_config(tmp_path: Path) -> Path:
    config_path = tmp_path / "game.json"
    config_path.write_text(
        json.dumps(
            {
                "world": {
                    "width": 80,
                    "depth": 80,
                    "terrain": "plain_green",
                    "seed": 42,
                },
                "npcs": {"count": 2},
                "simulation": {"tick_ms": 500},
                "server": {"host": "127.0.0.1", "port": 8000},
            }
        ),
        encoding="utf-8",
    )
    return config_path


def _write_modal_config(tmp_path: Path) -> Path:
    config_path = tmp_path / "game.modal.json"
    config_path.write_text(
        json.dumps(
            {
                "world": {
                    "width": 80,
                    "depth": 80,
                    "terrain": "plain_green",
                    "seed": 42,
                },
                "npcs": {"count": 2},
                "simulation": {"tick_ms": 500},
                "server": {"host": "127.0.0.1", "port": 8000},
                "connector": {
                    "type": "openai_compatible",
                    "base_url": "https://workspace--npc-serve.modal.run/v1",
                    "model": "npc-model",
                },
                "god_console": {
                    "type": "openai_compatible",
                    "base_url": "https://workspace--god-serve.modal.run/v1",
                    "model": "god-model",
                },
            }
        ),
        encoding="utf-8",
    )
    return config_path