from __future__ import annotations

import sys
from datetime import UTC, date, datetime
from pathlib import Path

import polars as pl
import pytest

ROOT = Path(__file__).resolve().parents[1]
if str(ROOT) not in sys.path:
    sys.path.insert(0, str(ROOT))


def _eps(cik, period_end, quarters, value, accepted, concept="eps_diluted"):
    return {"cik": cik, "concept": concept, "period_end": period_end, "quarters": quarters,
            "value": value, "accepted_at": accepted, "accession_number": f"acc-{accepted:%Y%m%d}"}


@pytest.fixture
def fundamentals() -> pl.DataFrame:
    """A four-for-one split: every prior period's EPS is restated to a quarter."""
    before = datetime(2020, 5, 1, tzinfo=UTC)
    after = datetime(2020, 11, 1, tzinfo=UTC)
    rows = []
    for index, period in enumerate(
        [date(2018, 12, 31), date(2019, 3, 31), date(2019, 6, 30), date(2019, 9, 30),
         date(2019, 12, 31)]
    ):
        rows.append(_eps("0000000001", period, 4 if index in (0, 4) else 1, 4.0, before))
        rows.append(_eps("0000000001", period, 4 if index in (0, 4) else 1, 1.0, after))
    # A company whose EPS was merely corrected, by a ratio no split is declared in.
    rows.append(_eps("0000000002", date(2019, 12, 31), 4, 1.83, before))
    rows.append(_eps("0000000002", date(2019, 12, 31), 4, 1.0, after))
    # A single restated period at a clean ratio: too thin to publish.
    rows.append(_eps("0000000003", date(2019, 12, 31), 4, 2.0, before))
    rows.append(_eps("0000000003", date(2019, 12, 31), 4, 1.0, after))
    return pl.DataFrame(rows, strict=False)


@pytest.fixture
def facts() -> pl.DataFrame:
    """Dividend facts and one tagged split ratio."""
    rows = [
        {"cik": "0000000001", "accession_number": "acc-1", "tag": "CommonStockDividendsPerShareDeclared",
         "value": 0.25, "unit": "USD", "period_end": date(2020, 3, 31), "quarters": 1,
         "form": "10-Q", "fiscal_year": 2020, "fiscal_period": "Q1",
         "filed_date": date(2020, 5, 1), "accepted_at": datetime(2020, 5, 1, tzinfo=UTC),
         "segments": None},
        {"cik": "0000000001", "accession_number": "acc-2", "tag": "CommonStockDividendsPerShareDeclared",
         "value": 0.30, "unit": "USD", "period_end": date(2020, 6, 30), "quarters": 1,
         "form": "10-Q", "fiscal_year": 2020, "fiscal_period": "Q2",
         "filed_date": date(2020, 8, 1), "accepted_at": datetime(2020, 8, 1, tzinfo=UTC),
         "segments": "SubsequentEventType=SubsequentEvent;"},
        {"cik": "0000000004", "accession_number": "acc-3",
         "tag": "StockholdersEquityNoteStockSplitConversionRatio1",
         "value": 6.0, "unit": "pure", "period_end": date(2024, 9, 30), "quarters": 0,
         "form": "10-Q", "fiscal_year": 2024, "fiscal_period": "Q3",
         "filed_date": date(2024, 10, 31), "accepted_at": datetime(2024, 10, 31, tzinfo=UTC),
         "segments": None},
    ]
    return pl.DataFrame(rows, strict=False)