import unittest
import tempfile
import os
from pen_tracker.engine import PenTracker, Pen

class TestPenTracker(unittest.TestCase):
    def setUp(self):
        self.temp_file = tempfile.NamedTemporaryFile(delete=False, suffix='.csv')
        self.temp_file.close()
        self.tracker = PenTracker(self.temp_file.name)

    def tearDown(self):
        os.unlink(self.temp_file.name)

    def test_add_and_load_pen(self):
        pen = Pen(Make="Pilot", Model="Metropolitan", Nib="F")
        self.tracker.pens.append(pen)
        self.tracker.save_data()
        
        # Load in new tracker
        new_tracker = PenTracker(self.temp_file.name)
        self.assertEqual(len(new_tracker.pens), 1)
        self.assertEqual(new_tracker.pens[0].Make, "Pilot")
        self.assertEqual(new_tracker.pens[0].Model, "Metropolitan")

    def test_sorting(self):
        self.tracker.pens = [
            Pen(Make="Z", Model="A"),
            Pen(Make="A", Model="B")
        ]
        self.tracker.save_data()
        new_tracker = PenTracker(self.temp_file.name)
        self.assertEqual(new_tracker.pens[0].Make, "A")
        self.assertEqual(new_tracker.pens[1].Make, "Z")

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