"""Tests for infra/resume.py — load_processed_identifiers."""

from infra.resume import load_processed_identifiers


class TestLoadProcessedIdentifiers:
    def test_none_path_returns_empty(self):
        assert load_processed_identifiers(None) == set()

    def test_nonexistent_file_returns_empty(self):
        assert load_processed_identifiers('/no/such/file.csv') == set()

    def test_empty_file_returns_empty(self, tmp_path):
        path = tmp_path / 'empty.csv'
        path.write_text('')
        assert load_processed_identifiers(str(path)) == set()

    def test_valid_file_returns_identifiers(self, tmp_path):
        path = tmp_path / 'success.csv'
        path.write_text(
            'Contract ID,Account ID,Contract Name\n1,100,Alpha\n2,200,Beta\n'
        )
        result = load_processed_identifiers(str(path))
        assert result == {('100', 'Alpha'), ('200', 'Beta')}

    def test_skips_rows_missing_account_id(self, tmp_path):
        path = tmp_path / 'success.csv'
        path.write_text('Contract ID,Account ID,Contract Name\n1,,Alpha\n2,200,Beta\n')
        result = load_processed_identifiers(str(path))
        assert result == {('200', 'Beta')}

    def test_skips_rows_missing_contract_name(self, tmp_path):
        path = tmp_path / 'success.csv'
        path.write_text('Contract ID,Account ID,Contract Name\n1,100,\n2,200,Beta\n')
        result = load_processed_identifiers(str(path))
        assert result == {('200', 'Beta')}

    def test_malformed_csv_returns_empty(self, tmp_path):
        path = tmp_path / 'bad.csv'
        path.write_bytes(b'\x80\x81\x82')
        result = load_processed_identifiers(str(path))
        assert result == set()

    def test_missing_columns_returns_empty_set(self, tmp_path):
        path = tmp_path / 'wrong_cols.csv'
        path.write_text('Foo,Bar\n1,2\n')
        result = load_processed_identifiers(str(path))
        assert result == set()