import json
import os
import sys
import tempfile
import unittest

sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))

import config


class TestConfig(unittest.TestCase):
    def setUp(self):
        self.dir = tempfile.mkdtemp()
        self.path = os.path.join(self.dir, "config.json")

    def test_missing_file_returns_default(self):
        cfg = config.load_config(self.path)
        self.assertEqual(cfg, config.default_config())
        self.assertEqual(cfg["buttons"], [])
        self.assertIsNone(cfg["output_device"])

    def test_corrupt_file_returns_default(self):
        with open(self.path, "w") as fh:
            fh.write("{not valid json")
        self.assertEqual(config.load_config(self.path), config.default_config())

    def test_round_trip(self):
        cfg = config.default_config()
        cfg["output_device"] = "CABLE Input"
        cfg["volume"] = 55
        cfg["buttons"] = [{"id": "btn_001", "label": "Air Horn", "file_path": "/x/a.mp3"}]
        config.save_config(self.path, cfg)
        loaded = config.load_config(self.path)
        self.assertEqual(loaded, cfg)

    def test_save_is_atomic_no_tmp_left(self):
        config.save_config(self.path, config.default_config())
        self.assertFalse(os.path.exists(self.path + ".tmp"))
        self.assertTrue(os.path.exists(self.path))

    def test_volume_clamped(self):
        with open(self.path, "w") as fh:
            json.dump({"volume": 999}, fh)
        self.assertEqual(config.load_config(self.path)["volume"], 100)

    def test_malformed_buttons_dropped(self):
        with open(self.path, "w") as fh:
            json.dump(
                {
                    "buttons": [
                        {"id": "btn_001", "label": "ok", "file_path": "/a"},
                        {"id": "btn_002", "label": "missing path"},
                        "not a dict",
                        {"id": 5, "label": "bad id type", "file_path": "/b"},
                    ]
                },
                fh,
            )
        buttons = config.load_config(self.path)["buttons"]
        self.assertEqual(len(buttons), 1)
        self.assertEqual(buttons[0]["id"], "btn_001")


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