import tomllib
import unittest
from pathlib import Path


REPO_ROOT = Path(__file__).resolve().parent.parent


class ProjectContractsTest(unittest.TestCase):
    def test_project_declares_supported_python_floor(self):
        pyproject = tomllib.loads((REPO_ROOT / "pyproject.toml").read_text(encoding="utf-8"))

        self.assertEqual(pyproject["project"]["requires-python"], ">=3.12")

    def test_readme_documents_python_support_and_default_save_filename(self):
        readme = (REPO_ROOT / "README.md").read_text(encoding="utf-8")

        self.assertIn("This project supports Python 3.12 and newer.", readme)
        self.assertIn("default filename `workflow_api.py`", readme)

    def test_extension_import_path_requires_uv_sync_instead_of_running_install_py(self):
        init_text = (REPO_ROOT / "__init__.py").read_text(encoding="utf-8")

        self.assertIn("Run 'uv sync'", init_text)
        self.assertNotIn("spec_from_file_location", init_text)
        self.assertNotIn("Successfully installed. Hopefully, at least.", init_text)

    def test_frontend_save_flow_uses_deterministic_filename_without_prompt(self):
        save_as_script = (REPO_ROOT / "js" / "save-as-script.js").read_text(encoding="utf-8")

        self.assertIn('const DEFAULT_SCRIPT_FILENAME = "workflow_api.py";', save_as_script)
        self.assertNotIn("prompt(", save_as_script)

    def test_pip_install_e_works_with_explicit_package_config(self):
        """`pip install -e .` must succeed — no 'Multiple top-level packages' error.

        Setuptools auto-discovers every top-level directory.  Without explicit
        `[tool.setuptools.packages.find]` the `js/` and `images/` asset dirs
        cause the install to abort with
        "Multiple top-level packages discovered in a flat-layout".
        """
        pyproject = tomllib.loads((REPO_ROOT / "pyproject.toml").read_text(encoding="utf-8"))

        setuptools_cfg = pyproject.get("tool", {}).get("setuptools", {})
        self.assertIn(
            "packages",
            setuptools_cfg,
            "pyproject.toml must declare [tool.setuptools.packages] to avoid "
            "setuptools discovering asset directories as packages during "
            "`pip install -e .`",
        )

    def test_pip_install_e_deps_include_aiohttp(self):
        """`aiohttp` is imported in `__init__.py` and must be a project dependency."""
        pyproject = tomllib.loads((REPO_ROOT / "pyproject.toml").read_text(encoding="utf-8"))
        deps = pyproject["project"]["dependencies"]

        dep_names = [d.split("=")[0].split(">")[0].split("<")[0].split("!")[0].strip().lower() for d in deps]

        self.assertIn(
            "aiohttp",
            dep_names,
            "aiohttp is imported in __init__.py and must be listed in project dependencies",
        )