"""Generazione ricevuta PDF per booking."""
from datetime import datetime
from pathlib import Path
from zoneinfo import ZoneInfo
from jinja2 import Environment, FileSystemLoader, select_autoescape
from weasyprint import HTML

TZ = ZoneInfo("Europe/Rome")
TEMPLATE_DIR = Path(__file__).resolve().parent.parent / "templates"

_env = Environment(
    loader=FileSystemLoader(str(TEMPLATE_DIR)),
    autoescape=select_autoescape(["html"]),
)

_WEEKDAY_IT = ["lunedì", "martedì", "mercoledì", "giovedì", "venerdì", "sabato", "domenica"]
_MONTH_IT = ["", "gennaio", "febbraio", "marzo", "aprile", "maggio", "giugno",
             "luglio", "agosto", "settembre", "ottobre", "novembre", "dicembre"]


def _fmt_datetime(dt: datetime) -> str:
    d = dt.astimezone(TZ)
    return f"{_WEEKDAY_IT[d.weekday()]} {d.day} {_MONTH_IT[d.month]} {d.year} alle ore {d:%H:%M}"


def _fmt_now() -> str:
    d = datetime.now(TZ)
    return f"{d.day} {_MONTH_IT[d.month]} {d.year} alle ore {d:%H:%M}"


def _price_str(price_cents):
    if price_cents is None:
        return "—"
    return f"€ {price_cents/100:,.2f}".replace(",", "X").replace(".", ",").replace("X", ".")


def render_receipt_pdf(booking, service, provider, settings_map: dict) -> bytes:
    """Costruisce il PDF della ricevuta. settings_map è {key: value} dalla tabella settings."""
    template = _env.get_template("receipt.html")
    html = template.render(
        booking=booking,
        service=service,
        provider=provider,
        pharmacy={
            "name": settings_map.get("pharmacy_name", "Farmacia Ianni SNC"),
            "address": settings_map.get("pharmacy_address", ""),
            "phone": settings_map.get("pharmacy_phone", ""),
            "email": settings_map.get("smtp_from", ""),
        },
        start_str=_fmt_datetime(booking.start_at),
        now_str=_fmt_now(),
        price_str=_price_str(service.price_cents),
    )
    return HTML(string=html).write_pdf()