from pathlib import Path

from cashflow_model import FinancialModel
from sync.excel_sync import ExcelSync, SyncError


class TestExcelSync:
    def test_export_creates_file(self, sample_model, tmp_path: Path):
        sync = ExcelSync()
        p = tmp_path / "test.xlsx"
        sync.export_model(sample_model, p)
        assert p.exists()

    def test_export_import_roundtrip(self, sample_model, tmp_path: Path):
        sync = ExcelSync()
        p = tmp_path / "roundtrip.xlsx"
        sync.export_model(sample_model, p)

        loaded = sync.import_model(p)
        assert len(loaded.accounts) == len(sample_model.accounts)
        assert len(loaded.transactions) == len(sample_model.transactions)
        assert len(loaded.recurring) == len(sample_model.recurring)
        assert len(loaded.assets) == len(sample_model.assets)
        assert len(loaded.liabilities) == len(sample_model.liabilities)

    def test_import_missing_file(self):
        sync = ExcelSync()
        try:
            sync.import_model("nonexistent.xlsx")
            assert False, "Expected SyncError"
        except SyncError:
            pass

    def test_export_empty_model(self, tmp_path: Path):
        sync = ExcelSync()
        model = FinancialModel()
        p = tmp_path / "empty.xlsx"
        sync.export_model(model, p)
        assert p.exists()