"""PPA revenue and commercial settlement computation."""

from __future__ import annotations

from remodel_engine.schemas.financial import CommercialConfig


def compute_annual_generation_mwh(
    solar_ac_mwh_by_year: list[float],
    wind_ac_mwh_by_year: list[float],
) -> list[float]:
    """Sum solar and wind generation for each year."""
    n = max(len(solar_ac_mwh_by_year), len(wind_ac_mwh_by_year))
    result: list[float] = []
    for y in range(n):
        s = solar_ac_mwh_by_year[y] if y < len(solar_ac_mwh_by_year) else 0.0
        w = wind_ac_mwh_by_year[y] if y < len(wind_ac_mwh_by_year) else 0.0
        result.append(s + w)
    return result


def compute_receivables(
    revenue_by_year: list[float],
    config: CommercialConfig,
) -> list[float]:
    """Receivables = revenue * receivable_days / 365."""
    return [
        round(rev * config.receivable_days / 365.0, 4)
        for rev in revenue_by_year
    ]


def compute_payables(
    opex_by_year: list[float],
    config: CommercialConfig,
) -> list[float]:
    """Payables = opex * payable_days / 365."""
    return [
        round(opex * config.payable_days / 365.0, 4)
        for opex in opex_by_year
    ]