"""Formulas from sheet 'Costs' of 'fpna_month_end.xlsx'.

Generated by Power Migrate 0.1.0a1 (no-AI mode). One function per
logic block, in the order they appear on the sheet; ``model.compute``
runs them in dependency order.
"""

from .. import xl
from ..xl import Book


def month_index(book: Book) -> None:
    r"""Month index

    Costs!C2:M2 (11 columns, copied across).
    Excel (C2): =B2+1
    Pattern (R1C1): =RC[-1]+1
    Reads: Costs!B2
    """
    costs = book['Costs']
    for c in range(3, 14):
        costs[2, c] = costs[2, c - 1] + 1


def headcount(book: Book) -> None:
    r"""Headcount

    Costs!B3:M3 (12 columns, copied across).
    Excel (B3): =ROUND(HeadcountStart*(1+GrowthRate)^(B2-1),0)
    Pattern (R1C1): =ROUND(HeadcountStart*(1+GrowthRate)^(R[-1]C-1),0)
    Reads: Assumptions!B5, Assumptions!B8, Costs!B2, name GrowthRate, name HeadcountStart
    """
    costs = book['Costs']
    for c in range(2, 14):
        costs[3, c] = xl.ROUND(book.name('HeadcountStart') * (1 + book.name('GrowthRate')) ** (costs[2, c] - 1), 0)


def salary_cost(book: Book) -> None:
    r"""Salary cost

    Costs!B4:M4 (12 columns, copied across).
    Excel (B4): =B3*AvgSalary/12
    Pattern (R1C1): =R[-1]C*AvgSalary/12
    Reads: Assumptions!B9, Costs!B3, name AvgSalary
    """
    costs = book['Costs']
    for c in range(2, 14):
        costs[4, c] = costs[3, c] * book.name('AvgSalary') / 12


def rent(book: Book) -> None:
    r"""Rent

    Costs!B5:M5 (12 columns, copied across).
    Excel (B5): =MonthlyRent
    Pattern (R1C1): =MonthlyRent
    Reads: Assumptions!B10, name MonthlyRent
    """
    costs = book['Costs']
    for c in range(2, 14):
        costs[5, c] = book.name('MonthlyRent')


def total_costs(book: Book) -> None:
    r"""Total costs

    Costs!B6:M6 (12 columns, copied across).
    Excel (B6): =SUM(B4:B5)
    Pattern (R1C1): =SUM(R[-2]C:R[-1]C)
    Reads: Costs!B4:B5
    """
    costs = book['Costs']
    for c in range(2, 14):
        costs[6, c] = xl.SUM(costs.rng(4, c, 5, c))