import os
import unittest
from unittest.mock import patch

from fastapi import HTTPException

from services.word_scan_service import word_scan_service


class WordScanServiceTest(unittest.TestCase):
    def tearDown(self):
        get_settings = __import__("config", fromlist=["get_settings"]).get_settings
        get_settings.cache_clear()

    def test_heuristic_parse_tab_separated_pairs(self):
        with patch.dict(os.environ, {"DEEPSEEK_API_KEY": ""}, clear=False):
            __import__("config", fromlist=["get_settings"]).get_settings.cache_clear()
            items = word_scan_service.parse_scan_text("apple\t苹果\nbanana\t香蕉")
        self.assertEqual(len(items), 2)
        self.assertEqual(items[0]["source_text"], "apple")
        self.assertEqual(items[0]["target_text"], "苹果")

    def test_empty_text_raises(self):
        with self.assertRaises(HTTPException) as ctx:
            word_scan_service.parse_scan_text("   ")
        self.assertEqual(ctx.exception.status_code, 400)

    def test_unparseable_text_raises(self):
        with patch.dict(os.environ, {"DEEPSEEK_API_KEY": ""}, clear=False):
            __import__("config", fromlist=["get_settings"]).get_settings.cache_clear()
            with self.assertRaises(HTTPException) as ctx:
                word_scan_service.parse_scan_text("hello world only english")
        self.assertEqual(ctx.exception.status_code, 422)


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