import json
import os
import subprocess
import sys
import tempfile
import unittest
from pathlib import Path


REPO_ROOT = Path(__file__).resolve().parents[1]
sys.path.insert(0, str(REPO_ROOT))

import host


class HostPureFunctionsTest(unittest.TestCase):
    def test_save_state_merges_tasks_and_preserves_disk_tasks(self):
        with tempfile.TemporaryDirectory() as tmp:
            state_path = os.path.join(tmp, "host-state.json")
            with open(state_path, "w", encoding="utf-8") as f:
                json.dump({"tasks": {"disk-task": {"status": "running"}},
                           "automations": []}, f)

            state = {"tasks": {"memory-task": {"status": "completed"}},
                     "automations": []}
            host.save_state(state_path, state)

            self.assertEqual(state["tasks"]["disk-task"], {"status": "running"})
            self.assertEqual(state["tasks"]["memory-task"], {"status": "completed"})
            loaded = host.load_state(state_path)
            self.assertEqual(loaded, state)

    def test_task_diff_includes_untracked_text_contents(self):
        with tempfile.TemporaryDirectory() as tmp:
            subprocess.run(["git", "init", "-q"], cwd=tmp, check=True)
            Path(tmp, "tracked.txt").write_text("tracked\n", encoding="utf-8")
            subprocess.run(["git", "add", "tracked.txt"], cwd=tmp, check=True)
            subprocess.run(["git", "-c", "user.name=Test", "-c",
                            "user.email=test@example.com", "commit", "-qm",
                            "initial"], cwd=tmp, check=True)
            Path(tmp, "new.txt").write_text("new file contents\n", encoding="utf-8")

            result = host.task_diff(tmp)

            self.assertIn("new.txt", result["untracked"].splitlines())
            self.assertEqual(result["untracked_contents"]["new.txt"],
                             "new file contents\n")

    def test_load_config_file_returns_empty_dict_for_missing_file(self):
        with tempfile.TemporaryDirectory() as tmp:
            missing = os.path.join(tmp, "missing.json")
            self.assertEqual(host._load_config_file(missing), {})


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