from __future__ import annotations

from datetime import datetime
from pathlib import Path

from openpyxl import load_workbook

from app.pipeline.mapping import FIXED_REPORT_COLUMNS
from app.pipeline.report import TOP_GROUP_HEADERS, ReportRow, write_report


def test_write_report_streaming_preserves_header_and_formats(tmp_path: Path) -> None:
    destination = tmp_path / "report.xlsx"
    rows = [
        ReportRow(
            file_name="SKO115FZ_01_123456789_20260616_X00001.xml",
            record_id="RID-1",
            operation_index=1,
            operation_fields={"СумОперации": "100.50", "ДатаСообщения": "2026-06-16"},
            participant_fields={},
        )
    ]

    write_report(rows, destination)

    workbook = load_workbook(destination)
    sheet = workbook["Отчет"]
    headers = [cell.value for cell in sheet[2]]
    assert headers == list(FIXED_REPORT_COLUMNS)
    assert sheet.freeze_panes == "A3"
    row_values = [
        sheet.cell(row=3, column=index).value
        for index in range(1, len(FIXED_REPORT_COLUMNS) + 1)
    ]
    assert "SKO115FZ_01_123456789_20260616_X00001.xml" in row_values

    date_col_idx = FIXED_REPORT_COLUMNS.index("Дата сообщения") + 1
    assert isinstance(sheet.cell(row=3, column=date_col_idx).value, datetime)
    assert sheet.cell(row=3, column=date_col_idx).number_format == "DD.MM.YYYY"

    sum_col_idx = FIXED_REPORT_COLUMNS.index("Сумма в валюте проведения") + 1
    assert sheet.cell(row=3, column=sum_col_idx).number_format == "#,##0.00"


def test_write_report_contains_top_group_header_row(tmp_path: Path) -> None:
    destination = tmp_path / "report.xlsx"
    write_report([], destination)

    workbook = load_workbook(destination)
    sheet = workbook["Отчет"]
    assert sheet.cell(row=1, column=1).value == "Служебные поля"
    merged_ranges = {str(rng) for rng in sheet.merged_cells.ranges}
    expected_ranges = set()
    for header in TOP_GROUP_HEADERS:
        if header.start_col > len(FIXED_REPORT_COLUMNS):
            continue
        end_col = min(header.end_col, len(FIXED_REPORT_COLUMNS))
        if header.start_col == end_col:
            continue
        expected_ranges.add(
            f"{_column_letter(header.start_col)}1:{_column_letter(end_col)}1"
        )
    assert merged_ranges == expected_ranges


def test_write_report_converts_date_string_to_excel_date(tmp_path: Path) -> None:
    destination = tmp_path / "report.xlsx"
    rows = [
        ReportRow(
            file_name="f.xml",
            record_id="RID",
            operation_index=1,
            operation_fields={"ДатаСообщения": "23/08/2005"},
            participant_fields={},
        )
    ]

    write_report(rows, destination)

    workbook = load_workbook(destination)
    sheet = workbook["Отчет"]
    date_col_idx = FIXED_REPORT_COLUMNS.index("Дата сообщения") + 1
    cell = sheet.cell(row=3, column=date_col_idx)
    assert isinstance(cell.value, datetime)
    assert cell.value.date() == datetime(2005, 8, 23).date()
    assert cell.number_format == "DD.MM.YYYY"


def test_write_report_keeps_invalid_date_as_text_without_date_format(
    tmp_path: Path,
) -> None:
    destination = tmp_path / "report.xlsx"
    rows = [
        ReportRow(
            file_name="f.xml",
            record_id="RID",
            operation_index=1,
            operation_fields={"ДатаСообщения": "не дата"},
            participant_fields={},
        )
    ]

    write_report(rows, destination)

    workbook = load_workbook(destination)
    sheet = workbook["Отчет"]
    date_col_idx = FIXED_REPORT_COLUMNS.index("Дата сообщения") + 1
    cell = sheet.cell(row=3, column=date_col_idx)
    assert cell.value == "не дата"
    assert cell.number_format != "DD.MM.YYYY"


def _column_letter(index: int) -> str:
    value = index
    result = ""
    while value:
        value, remainder = divmod(value - 1, 26)
        result = chr(65 + remainder) + result
    return result