import json
from pathlib import Path
import tempfile
import unittest
from unittest.mock import patch
import hint_library as lib

class HintLibraryTests(unittest.TestCase):
    def setUp(self):
        self.temp=tempfile.TemporaryDirectory()
        self.path=Path(self.temp.name)/"hints.json"
        self.patch=patch.object(lib,"PATH",self.path); self.patch.start()
    def tearDown(self):
        self.patch.stop(); self.temp.cleanup()
    def hint(self):
        return {"title":"Find the records","text":"Look at the sleeve — then the record.","categories":["Records","Discovery"],
            "phase":"ARCADE","target":"P03","condition":"incomplete","level":1}
    def test_persists_and_updates_with_stable_id(self):
        data=lib.save({"revision":0,"hint":self.hint()})
        self.assertEqual(lib.read(),data)
        added=data["hints"][-1]
        added["text"]="A clearer hint"
        updated=lib.save({"revision":1,"hint":added})
        self.assertEqual(len(data["hints"]),len(updated["hints"]))
        self.assertEqual(lib.read()["hints"][-1]["text"],"A clearer hint")
        self.assertTrue(self.path.with_suffix(".bak").exists())
    def test_conflict_preserves_other_device_edits(self):
        lib.save({"revision":0,"hint":self.hint()})
        before=self.path.read_bytes()
        with self.assertRaises(lib.Conflict): lib.save({"revision":0,"hint":self.hint()})
        self.assertEqual(self.path.read_bytes(),before)
    def test_bad_input_and_corrupt_file_are_not_overwritten(self):
        hint=self.hint(); hint["text"]="x"*1501
        with self.assertRaises(ValueError): lib.save({"revision":0,"hint":hint})
        self.path.write_text("broken",encoding="utf-8")
        with self.assertRaises(ValueError): lib.save({"revision":0,"hint":self.hint()})
        self.assertEqual(self.path.read_text(),"broken")

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