"""Строки таблицы OCR (§11.1 п. 3–5): шапка настоящая/повторная/синтетическая, классы строк, тип по кодам."""

import json
from pathlib import Path

import pytest

from src.normalizer.ocr.layout import ColumnLayout, cells_by_index
from src.normalizer.ocr.rows import ParsedTable, RowKind, classify_row, parse_table_rows, table_type_by_codes

API_DIR = Path(__file__).resolve().parents[3]
REAL_FIXTURES = API_DIR.parent.parent / "fixtures" / "ocr"
KNOWN = frozenset({"1105", "1110", "1120", "1130", "1150", "1600", "2110", "2120", "2100"})


def _row(index: int, *cells: tuple[int, str, float]) -> dict:
    return {"row_index": index, "cells": [{"column_index": i, "value": v, "confidence": c} for i, v, c in cells]}


HEADER = _row(
    0,
    (0, "Наименование показателя", 100),
    (1, "Код", 100),
    (2, "На 30 июня\n2025 г", 100),
    (4, "На 31 декабря\n2024 г.", 100),
)


def _real_table(name: str, index: int) -> list[dict]:
    if not REAL_FIXTURES.is_dir():
        pytest.skip("fixtures недоступен: положите репозиторий fixtures рядом с workspace")
    data = json.loads((REAL_FIXTURES / name).read_text(encoding="utf-8"))
    return list(data["data_ocr"]["table_structure"][index]["rows"])


class TestClassifyRow:
    layout = ColumnLayout(label_idx=0, code_idx=1, value_idxs=(2,))

    @pytest.mark.parametrize(
        ("label", "code", "expected"),
        [
            ("Выручка", "2110", RowKind.ROW),
            ("Итого по разделу I", "1100", RowKind.TOTAL),
            ("Баланс", "1600", RowKind.BALANCE),
            ("Наименование", "Код", RowKind.HEADER),
            ("в том числе:", "", None),
        ],
    )
    def test_kinds(self, label: str, code: str, expected: RowKind | None) -> None:
        cells = cells_by_index(_row(1, (0, label, 100), (1, code, 100), (2, "1", 100)))
        assert classify_row(cells, self.layout) is expected


class TestParseTableRows:
    def test_header_then_rows(self) -> None:
        rows = [
            HEADER,
            _row(1, (0, "Выручка", 100), (1, "2110", 100), (2, "13 070", 100), (4, "", 100)),
            _row(2, (0, "в том числе:", 93), (1, "", 100), (2, "13 070", 100), (4, "", 100)),
        ]
        parsed = parse_table_rows(rows, KNOWN)
        assert isinstance(parsed, ParsedTable) and not parsed.synthetic_header
        assert [r.kind for r in parsed.rows] == [RowKind.HEADER, RowKind.ROW]
        assert parsed.rows[0].layout == ColumnLayout(label_idx=0, code_idx=1, value_idxs=(2, 4))
        assert parsed.rows[1].ordinal == 1

    def test_second_header_overrides_layout(self) -> None:
        """Review Focus 1: после повторной шапки с другим набором колонок строки идут по новой раскладке."""
        rows = [
            HEADER,
            _row(1, (0, "Выручка", 100), (1, "2110", 100), (2, "1", 100), (4, "2", 100)),
            _row(2, (0, "Наименование показателя", 100), (1, "Код", 100), (3, "За 2024 г.", 100)),
            _row(3, (0, "Себестоимость", 100), (1, "2120", 100), (3, "(5)", 100)),
        ]
        parsed = parse_table_rows(rows, KNOWN)
        assert parsed is not None
        kinds = [r.kind for r in parsed.rows]
        assert kinds == [RowKind.HEADER, RowKind.ROW, RowKind.ROW]  # повторная шапка не становится строкой
        assert parsed.rows[1].layout.value_idxs == (2, 4)
        assert parsed.rows[2].layout.value_idxs == (3,)

    def test_rows_before_header_use_inferred_layout(self) -> None:
        rows = [
            _row(0, (1, "1110", 100), (0, "Нематериальные активы", 100), (2, "5", 100)),
            _row(1, (0, "Наименование показателя", 100), (1, "Код", 100), (2, "2024", 100)),
            _row(2, (0, "Основные средства", 100), (1, "1150", 100), (2, "7", 100)),
        ]
        parsed = parse_table_rows(rows, KNOWN)
        assert parsed is not None and not parsed.synthetic_header
        assert [r.ordinal for r in parsed.rows] == [-1, 0, 2]  # шапка встаёт раньше первой строки данных
        assert parsed.rows[0].kind is RowKind.HEADER

    def test_synthetic_header_when_none(self) -> None:
        rows = [
            _row(0, (1, "1110", 100), (0, "Нематериальные активы", 100), (2, "5", 100)),
            _row(1, (1, "1150", 100), (0, "Основные средства", 100), (2, "7", 100)),
        ]
        parsed = parse_table_rows(rows, KNOWN)
        assert parsed is not None and parsed.synthetic_header
        header = parsed.rows[0]
        assert header.kind is RowKind.HEADER and header.ordinal == -1
        assert header.cells[1].value == "Код" and header.cells[0].value == "Наименование показателя"
        assert header.layout.value_idxs == (2,) and header.cells.get(2) is None  # тексты периодов пустые

    def test_no_header_no_codes_is_none(self) -> None:
        assert parse_table_rows([_row(0, (0, "текст", 100), (1, "мусор", 100))], KNOWN) is None
        assert parse_table_rows([], KNOWN) is None

    @pytest.mark.fixtures
    def test_aep3_balance_without_header(self) -> None:
        parsed = parse_table_rows(_real_table("aep_3.json", 0), KNOWN)
        assert parsed is not None and parsed.synthetic_header
        assert parsed.rows[0].layout.code_idx == 1
        assert any(r.cells[1].value.strip() == "1120" for r in parsed.rows[1:])

    @pytest.mark.fixtures
    def test_aep6_balance_with_header(self) -> None:
        parsed = parse_table_rows(_real_table("aep_6.json", 0), KNOWN)
        assert parsed is not None and not parsed.synthetic_header
        assert parsed.rows[0].layout == ColumnLayout(label_idx=0, code_idx=1, value_idxs=(2, 4, 5))
        assert table_type_by_codes(parsed) == "BALANCE"


class TestTableType:
    def test_by_first_digit(self) -> None:
        rows = [
            HEADER,
            _row(1, (0, "Выручка", 100), (1, "2110", 100), (2, "1", 100)),
            _row(2, (0, "Себестоимость", 100), (1, "2120", 100), (2, "1", 100)),
            _row(3, (0, "ОС", 100), (1, "1150", 100), (2, "1", 100)),
        ]
        assert table_type_by_codes(parse_table_rows(rows, KNOWN)) == "INCOME"

    def test_tie_or_empty_is_none(self) -> None:
        rows = [
            HEADER,
            _row(1, (0, "a", 100), (1, "2110", 100), (2, "1", 100)),
            _row(2, (0, "b", 100), (1, "1150", 100), (2, "1", 100)),
        ]
        assert table_type_by_codes(parse_table_rows(rows, KNOWN)) is None
        assert table_type_by_codes(ParsedTable(rows=[], synthetic_header=False)) is None