"""End-to-end engine demo — no model, just the deterministic math.

Run from the project root:  python -m scripts.demo

It walks through a month in the life of a freelance designer under RESICO, then
shows the same income under the general regime for comparison, an IVA position, a
health check, and the USA bonus mode.
"""

import sys

# Windows consoles default to cp1252; force UTF-8 so the breakdown glyphs render.
try:
    sys.stdout.reconfigure(encoding="utf-8")
except (AttributeError, ValueError):
    pass

from src.engine import (
    cash_runway_months,
    current_ratio,
    federal_income_tax,
    isr_provisional_monthly,
    iva_monthly,
    profit_margin,
    quarterly_estimated_tax,
    resico_isr_monthly,
    schedule_c_net_profit,
    self_employment_tax,
    taxable_base,
)


def section(title):
    print("\n" + "═" * 64)
    print(title)
    print("═" * 64)


def show(result):
    print(result.explain())


def main():
    # --- A month for a freelance designer ---------------------------------
    income = 45000          # MXN invoiced this month
    deductions = 12000      # software, rent share, equipment

    section("MEXICO · RESICO (flat rate on income)")
    show(resico_isr_monthly(income))

    section("MEXICO · General regime (income − deductions, progressive)")
    base = taxable_base(income, deductions)
    print(f"Taxable base = {income} − {deductions} = {base}")
    show(isr_provisional_monthly(base))
    print("\n→ For this profile RESICO is dramatically cheaper. The agent would "
          "flag that and explain why.")

    section("MEXICO · IVA position for the month")
    # 16% collected on 45,000 of sales; paid 16% on 12,000 of deductible buys.
    show(iva_monthly(iva_trasladado=45000 * 0.16, iva_acreditable=12000 * 0.16))

    section("HEALTH CHECK")
    show(current_ratio(150000, 100000))
    show(profit_margin(income - deductions, income))
    show(cash_runway_months(90000, 30000))

    # --- USA bonus mode ----------------------------------------------------
    section("USA · self-employed (Schedule C)")
    net = schedule_c_net_profit(100000, 40000)
    show(net)
    se = self_employment_tax(net.amount)
    show(se)
    inc_tax = federal_income_tax(net.amount)
    show(inc_tax)
    show(quarterly_estimated_tax(inc_tax.amount, se.amount))

    print("\nEvery number above came from the deterministic engine, with its source "
          "attached. The LLM's job is only to choose which to call and explain it.")


if __name__ == "__main__":
    main()