"""Execute production browser functions under Node and verify the current served build."""
from __future__ import annotations

import ast
import re
import shutil
import subprocess
from datetime import date
from functools import lru_cache
from pathlib import Path
from tempfile import TemporaryDirectory

ROOT = Path(__file__).resolve().parents[1]


def run_timer_contract(scenario: str) -> None:
    node = shutil.which("node")
    assert node is not None, "Node is required for executable browser timer regressions"
    result = subprocess.run([node, str(ROOT / "tests/runtime_timer_contracts.cjs"), scenario],
                            capture_output=True, text=True, timeout=15)
    assert result.returncode == 0, result.stdout + result.stderr
    assert f"PASS: {scenario}" in result.stdout


@lru_cache(maxsize=1)
def assert_current_build_contract() -> None:
    """Check the actual assignment and rendered boot, ignoring historical comments."""
    from fastapi import FastAPI
    from fastapi.testclient import TestClient
    from ui_builder.integration import install_ui_builder

    module = ast.parse((ROOT / "app.py").read_text(encoding="utf-8"))
    assignments = [node for node in module.body if isinstance(node, ast.Assign)
                   and any(isinstance(target, ast.Name) and target.id == "BUILD_VERSION" for target in node.targets)]
    assert len(assignments) == 1
    version = ast.literal_eval(assignments[0].value)
    assert isinstance(version, str) and re.fullmatch(r"\d{4}\.\d{2}\.\d{2}\.\d+", version)
    date(*map(int, version.split(".")[:3]))
    install_calls = [node for node in ast.walk(module) if isinstance(node, ast.Call)
                     and isinstance(node.func, ast.Name) and node.func.id == "install_ui_builder"]
    assert len(install_calls) == 1
    assert any(keyword.arg == "build_version" and isinstance(keyword.value, ast.Name)
               and keyword.value.id == "BUILD_VERSION" for keyword in install_calls[0].keywords)
    with TemporaryDirectory() as temporary:
        app = FastAPI()
        install_ui_builder(app, build_version=version, settings_dir=Path(temporary), data_providers={})
        with TestClient(app) as client:
            response = client.get("/")
        assert response.status_code == 200
        assert f'buildVersion: "{version}"' in response.text
        assert "__UI_BUILDER_BUILD_VERSION__" not in response.text