"""Per-tenant SMS templates with safe Bosnian defaults (§5.5).

Tenant overrides live in tenants.sms_templates (only overridden keys stored).
Placeholders are .format()-style; unknown placeholders are left intact.
"""

from __future__ import annotations

from gogo.models import Tenant

DEFAULT_TEMPLATES: dict[str, str] = {
    "missed_call": (
        "Poštovani, dobili ste {salon}. Možete zakazati i putem poruke ili chata: {link}. "
        "Nazvaćemo vas ili nas pozovite ponovo."
    ),
    "request_received": (
        "Primili smo vaš zahtjev za termin. Javićemo vam potvrdu u najkraćem roku. — {salon}"
    ),
    "confirmation": "Potvrđen termin: {usluga}, {dan} {datum} u {vrijeme}h — {salon}.",
    "rejection": "{salon}: nažalost traženi termin nije moguć. Molimo pozovite nas da dogovorimo drugi.",
    "expiry": (
        "{salon}: nismo uspjeli potvrditi vaš zahtjev za termin. "
        "Molimo pozovite nas ponovo da dogovorimo termin."
    ),
}


class _SafeDict(dict):
    def __missing__(self, key: str) -> str:
        return "{" + key + "}"


def render_sms(tenant: Tenant, kind: str, **params: str) -> str:
    templates = {**DEFAULT_TEMPLATES, **(tenant.sms_templates or {})}
    template = templates[kind]
    params.setdefault("salon", tenant.name)
    return template.format_map(_SafeDict(params))