"""Читатели книг: синтетическая книга openpyxl в памяти → `Sheet`; определение формата по сигнатуре; ошибки чтения."""

import datetime
import io
import zipfile
from collections.abc import Iterator
from decimal import Decimal
from types import TracebackType
from typing import NamedTuple

import openpyxl
import pytest
from openpyxl.styles import Alignment, Font

from src.contract import ErrorCode
from src.parser.errors import ParserError, UnreadableError, UnsupportedFormatError
from src.parser.grid import EMPTY_CELL, Cell, MergedRange
from src.parser.readers import read_book
from src.parser.readers import xlsb as xlsb_reader
from src.parser.readers._common import make_cell


def _synthetic_xlsx() -> bytes:
    """Две страницы: шапка с merged-заголовками, outline 0/1/2, bold, отступ, число, дата, bool, пустые строки,
    ячейки из пробелов и NBSP, merged-диапазон с пробельным origin."""
    book = openpyxl.Workbook()
    osv = book.active
    assert osv is not None
    osv.title = "ОСВ"
    osv["A1"] = "ООО Ромашка"
    osv["A1"].font = Font(bold=True)
    osv["A3"] = "Счет"
    osv.merge_cells("A3:A4")
    osv["B3"] = "Сальдо на начало периода"
    osv.merge_cells("B3:C3")
    osv["B4"] = "Дебет"
    osv["C4"] = "Кредит"
    osv["A5"] = "62"
    osv["A5"].font = Font(bold=True)
    osv["B5"] = 1500
    osv["A6"] = "62.01"
    osv["A6"].alignment = Alignment(indent=2)
    osv["B6"] = 1500.25
    osv.row_dimensions[6].outline_level = 1
    osv["A7"] = "   Контрагент"
    osv["B7"] = datetime.datetime(2024, 9, 30)
    osv.row_dimensions[7].outline_level = 2
    osv["A9"] = " "
    osv["B9"] = "\xa0"
    osv["D3"] = " "
    osv.merge_cells("D3:E3")
    osv["A10"] = "Итого"
    osv["C10"] = True
    other = book.create_sheet("Прочее")
    other["A1"] = "x"
    buffer = io.BytesIO()
    book.save(buffer)
    return buffer.getvalue()


def test_xlsx_reader_builds_sheet_model() -> None:
    sheets, warnings = read_book(_synthetic_xlsx(), "XLSX")

    assert warnings == []
    assert [sheet.name for sheet in sheets] == ["ОСВ", "Прочее"]
    osv = sheets[0]
    assert osv.cell(1, 1) == Cell("ООО Ромашка", "text", bold=True)
    assert osv.cell(5, 1) == Cell("62", "text", bold=True)
    assert osv.cell(5, 2) == Cell(Decimal("1500"), "number")
    assert osv.cell(6, 1) == Cell("62.01", "text", indent=2)
    assert osv.cell(6, 2) == Cell(Decimal("1500.25"), "number")
    assert osv.cell(7, 1) == Cell("   Контрагент", "text", indent=3)
    assert osv.cell(7, 2) == Cell(datetime.datetime(2024, 9, 30), "date")
    assert osv.cell(10, 3) == Cell(True, "bool")
    assert osv.cell(9, 1) is EMPTY_CELL
    assert osv.cell(9, 2) is EMPTY_CELL
    assert (9, 1) not in osv.cells
    assert (9, 2) not in osv.cells
    assert osv.is_row_empty(8)
    assert osv.is_row_empty(9)
    assert osv.text_at(3, 5) == ""
    assert osv.merged_origin(3, 5) == (3, 4)
    assert set(osv.merged) == {MergedRange(3, 1, 4, 1), MergedRange(3, 2, 3, 3), MergedRange(3, 4, 3, 5)}
    assert osv.text_at(4, 1) == "Счет"
    assert osv.text_at(3, 3) == "Сальдо на начало периода"
    assert [osv.outline(row) for row in range(1, 11)] == [0, 0, 0, 0, 0, 1, 2, 0, 0, 0]
    assert (osv.n_rows, osv.n_cols) == (10, 5)
    assert all(cell.kind != "empty" for cell in osv.cells.values())
    assert sheets[1].row_cells(1) == [(1, Cell("x", "text"))]


def test_file_type_mismatch_reads_by_signature_with_warning() -> None:
    sheets, warnings = read_book(_synthetic_xlsx(), "XLS")

    assert [sheet.name for sheet in sheets] == ["ОСВ", "Прочее"]
    assert warnings == ["file_type=XLS, но содержимое OOXML: прочитано как XLSX"]


def test_garbage_bytes_are_unsupported_format() -> None:
    with pytest.raises(UnsupportedFormatError) as caught:
        read_book(b"%PDF-1.7 not a workbook", "XLSX")

    assert caught.value.code is ErrorCode.UNSUPPORTED_FORMAT
    assert isinstance(caught.value, ParserError)


def test_truncated_zip_is_unreadable_with_one_line_reason() -> None:
    data = _synthetic_xlsx()

    with pytest.raises(UnreadableError) as caught:
        read_book(data[: len(data) // 2], "XLSX")

    assert caught.value.code is ErrorCode.UNREADABLE
    assert caught.value.message
    assert "\n" not in caught.value.message


def test_truncated_biff_is_unreadable() -> None:
    with pytest.raises(UnreadableError):
        read_book(bytes.fromhex("D0CF11E0A1B11AE1") + b"\x00" * 64, "XLS")


def _zip_with(name: str) -> bytes:
    buffer = io.BytesIO()
    with zipfile.ZipFile(buffer, "w") as archive:
        archive.writestr(name, b"\x00")
    return buffer.getvalue()


class _XlsbCell(NamedTuple):
    r: int
    c: int
    v: object


class _FakeXlsbSheet:
    def __init__(self, rows: list[list[_XlsbCell]]) -> None:
        self._rows = rows

    def __enter__(self) -> "_FakeXlsbSheet":
        return self

    def __exit__(self, *exc: object) -> None:
        return None

    def rows(self, sparse: bool = False) -> Iterator[list[_XlsbCell]]:
        assert sparse
        yield from self._rows


class _FakeXlsbBook:
    sheets = ("Лист1",)

    def __enter__(self) -> "_FakeXlsbBook":
        return self

    def __exit__(
        self, exc_type: type[BaseException] | None, exc: BaseException | None, tb: TracebackType | None
    ) -> None:
        return None

    def get_sheet(self, name: str) -> _FakeXlsbSheet:
        assert name == "Лист1"
        return _FakeXlsbSheet(
            [
                [_XlsbCell(0, 0, "Счет"), _XlsbCell(0, 1, None), _XlsbCell(0, 2, "  ")],
                [_XlsbCell(2, 0, "62.01"), _XlsbCell(2, 1, 0.1), _XlsbCell(2, 2, False)],
            ]
        )


def test_xlsb_signature_is_read_by_pyxlsb_without_outline(monkeypatch: pytest.MonkeyPatch) -> None:
    monkeypatch.setattr(xlsb_reader.pyxlsb, "open_workbook", lambda _stream: _FakeXlsbBook())

    sheets, warnings = read_book(_zip_with("xl/workbook.bin"), "XLSB")

    assert warnings == ["xlsb: outline level недоступен"]
    (sheet,) = sheets
    assert sheet.name == "Лист1"
    assert sheet.cell(1, 1) == Cell("Счет", "text")
    assert sheet.cell(1, 3) is EMPTY_CELL
    assert (1, 3) not in sheet.cells
    assert sheet.cell(3, 2) == Cell(Decimal("0.1"), "number")
    assert sheet.cell(3, 3) == Cell(False, "bool")
    assert sheet.merged == ()
    assert sheet.row_outline == {}
    assert (sheet.n_rows, sheet.n_cols) == (3, 3)


def test_zip_without_workbook_bin_goes_to_openpyxl_and_is_unreadable() -> None:
    with pytest.raises(UnreadableError):
        read_book(_zip_with("hello.txt"), "XLSX")


@pytest.mark.parametrize(
    ("value", "expected_text"),
    [
        (2370012036.0, "2370012036"),  # xls хранит число как float: «.0» — артефакт чтения (OQ-162, #32)
        (501604329883.0, "501604329883"),
        (-15.0, "-15"),
        (1234.56, "1234.56"),
        (7706808138, "7706808138"),
    ],
)
def test_integral_float_is_read_without_fraction(value: float, expected_text: str) -> None:
    cell = make_cell(value)

    assert cell is not None
    assert (cell.kind, cell.text) == ("number", expected_text)
    assert cell.value == Decimal(str(value))