import unittest
from pathlib import Path

from deploy_tool.path_manager import EnvironmentUpdate, build_environment_update, merge_path_entries, apply_user_environment


class FakeRegistry:
    def __init__(self):
        self.values = {}
        self.broadcasted = False

    def get_value(self, name):
        return self.values.get(name, "")

    def set_value(self, name, value):
        self.values[name] = value

    def broadcast_change(self):
        self.broadcasted = True


class PathManagerTests(unittest.TestCase):
    def test_merge_path_entries_appends_without_duplicates(self):
        current = r"C:\Windows;C:\Java\bin"
        merged = merge_path_entries(current, [Path(r"C:\Java\bin"), Path(r"C:\mysql\bin")])

        self.assertEqual(merged, r"C:\Windows;C:\Java\bin;C:\mysql\bin")

    def test_build_environment_update_sets_java_home_from_bin(self):
        update = build_environment_update("JDK", Path(r"C:\Program Files\Eclipse Adoptium\jdk-8\bin\java.exe"))

        self.assertEqual(update.path_entries, [Path(r"C:\Program Files\Eclipse Adoptium\jdk-8\bin")])
        self.assertEqual(update.env_vars["JAVA_HOME"], r"C:\Program Files\Eclipse Adoptium\jdk-8")

    def test_apply_user_environment_writes_path_and_env_vars(self):
        registry = FakeRegistry()
        registry.values["Path"] = r"C:\Windows"
        update = EnvironmentUpdate(path_entries=[Path(r"C:\Tools\bin")], env_vars={"JAVA_HOME": r"C:\Java"})

        apply_user_environment(update, registry)

        self.assertEqual(registry.values["Path"], r"C:\Windows;C:\Tools\bin")
        self.assertEqual(registry.values["JAVA_HOME"], r"C:\Java")
        self.assertTrue(registry.broadcasted)


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