import datetime
import openpyxl
import pytest
import ingest

def _make_workbook(tmp_path, sheet_name, rows):
    wb = openpyxl.Workbook()
    ws = wb.active
    ws.title = sheet_name
    for r in rows:
        ws.append(r)
    path = tmp_path / "wb.xlsx"
    wb.save(path)
    return path

def test_read_sheet_converts_cells(tmp_path):
    path = _make_workbook(tmp_path, "S", [
        ["Index", "Datum"],
        ["W-0001", datetime.datetime(1888, 2, 15)],
        ["W-0002", 1],
    ])
    rows = ingest.read_sheet(path, "S")
    assert rows[0] == ["Index", "Datum"]
    assert rows[1] == ["W-0001", "1888-02-15"]   # Excel date -> ISO string
    assert rows[2] == ["W-0002", "1"]            # integer -> plain string

def test_build_header_map_collapses_whitespace_and_case():
    header = ["Index", "Datum  des Briefes", "EmpfängerIn", "Mystery"]
    field_map = {"index": "index", "datum des briefes": "date", "empfängerin": "receivers"}
    fields, unknown = ingest.build_header_map(header, field_map, required={"index"})
    assert fields == {"index": 0, "date": 1, "receivers": 2}
    assert unknown == ["Mystery"]

def test_build_header_map_missing_required_raises():
    with pytest.raises(ValueError, match="index"):
        ingest.build_header_map(["Box", "Ort"], {"box": "box", "ort": "location"}, required={"index"})