import json
import pathlib
import subprocess
import sys
import tempfile
import unittest


class SimulatorSelectionTests(unittest.TestCase):
    def select(self, devices, sdk):
        with tempfile.TemporaryDirectory() as folder:
            path = pathlib.Path(folder) / "devices.json"
            path.write_text(json.dumps({"devices": devices}), encoding="utf-8")
            return subprocess.run([sys.executable, str(pathlib.Path(__file__).with_name("select_simulator.py")), str(path), sdk],
                                  capture_output=True, text=True)

    def test_matches_sdk_and_preserves_id(self):
        expected = "DC4CD8B3-4457-4153-9087-A0D7A2F9BFD9"
        result = self.select({
            "com.apple.CoreSimulator.SimRuntime.iOS-26-2": [{"name": "iPhone 17", "isAvailable": True, "udid": "E952A9B0-CC78-435C-BF08-06AD47FE1076"}],
            "com.apple.CoreSimulator.SimRuntime.iOS-18-5": [{"name": "iPhone 16 Pro", "isAvailable": True, "udid": expected}],
        }, "18.5")
        self.assertEqual(result.returncode, 0, result.stderr)
        self.assertEqual(result.stdout.strip(), "SIMULATOR_ID=" + expected)

    def test_fails_when_sdk_has_no_available_iphone(self):
        result = self.select({"com.apple.CoreSimulator.SimRuntime.iOS-18-5": [
            {"name": "iPad", "isAvailable": True, "udid": "DC4CD8B3-4457-4153-9087-A0D7A2F9BFD9"},
            {"name": "iPhone 16", "isAvailable": False, "udid": "E952A9B0-CC78-435C-BF08-06AD47FE1076"},
        ]}, "18.5")
        self.assertNotEqual(result.returncode, 0)
        self.assertEqual(result.stdout, "")


if __name__ == "__main__":
    unittest.main()