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"""Tests for FollowUpScanner implementations."""

import unittest
from unittest.mock import Mock

from pypaimon.read.scanner.delta_follow_up_scanner import DeltaFollowUpScanner
from pypaimon.read.scanner.follow_up_scanner import FollowUpScanner


class FollowUpScannerInterfaceTest(unittest.TestCase):
    """Test that FollowUpScanner interface is properly defined."""

    def test_follow_up_scanner_is_abstract(self):
        """FollowUpScanner should be an abstract base class."""
        with self.assertRaises(TypeError):
            FollowUpScanner()


class DeltaFollowUpScannerTest(unittest.TestCase):
    """Tests for DeltaFollowUpScanner which handles APPEND commits only."""

    def setUp(self):
        self.scanner = DeltaFollowUpScanner()

    def test_should_scan_returns_true_for_append_commit(self):
        """DeltaFollowUpScanner should scan APPEND commits."""
        snapshot = Mock()
        snapshot.commit_kind = "APPEND"

        result = self.scanner.should_scan(snapshot)

        self.assertTrue(result)

    def test_should_scan_returns_false_for_non_append_commits(self):
        """DeltaFollowUpScanner should skip non-APPEND commits."""
        for kind in ("COMPACT", "OVERWRITE", "EXPIRE", "ANALYZE"):
            snapshot = Mock(commit_kind=kind)
            self.assertFalse(self.scanner.should_scan(snapshot), kind)


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