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"""Cœur métier du module Financement Bancaire : apport initial + gate check.
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Fonctions PURES (aucune I/O, aucun horodatage) → testables et déterministes.
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Elles matérialisent l'exigence Michel (DIRECTIVE + amendement 2026-08-03) :
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AUCUN dossier n'est transmis à la banque tant que les 4 conditions ne sont pas
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remplies :
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1. apport_initial_complet — dépôt initial (20 % résident RD · 30 % étranger)
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intégralement versé et vérifié ;
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2. documents_exiges — tous les documents `is_required` de la banque
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choisie au statut « Validé WAG » ou « Envoyé banque » ;
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3. autorisations_signees — toutes les autorisations signées (date non nulle) ;
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4. validation_wag — un conseiller WAG a validé (`wag_validated_by`).
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Anti-invention (#6) : les taux d'apport (20/30) et la liste des documents/
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autorisations ne sont JAMAIS codés en dur ici — ils proviennent du contrat
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`financement_spec.json` via `GateConfig`. Changer le contrat change le gate,
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sans toucher ce code.
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"""
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from __future__ import annotations
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from typing import Any
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# Ordre canonique des 4 clés de condition du gate (= ordre du contrat / bannière).
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CONDITION_KEYS = (
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"apport_initial_complet",
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"documents_exiges",
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"autorisations_signees",
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"validation_wag",
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)
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class GateConfig:
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"""Vue en lecture du contrat, indexée pour le calcul du gate."""
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def __init__(self, spec: dict) -> None:
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self.taux_apport_pct: dict[str, float] = {
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rt["code"]: float(rt["taux_apport_pct"])
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for rt in spec["apport"]["residence_types"]
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}
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self.documents: list[dict] = list(spec["documents"])
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self.autorisations: list[dict] = list(spec["autorisations"])
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self.statuts_recevables: set[str] = set(spec["document_statuses_recevables"])
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self.banques: dict[str, dict] = {b["id"]: b for b in spec["banques"]}
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@classmethod
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def from_spec(cls, spec: dict) -> "GateConfig":
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return cls(spec)
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def _round1(x: float) -> float:
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"""Arrondi à 1 décimale, stable pour un artefact diffable."""
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return round(x + 0.0, 1)
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def apport_requis_usd(prix_usd: float, residence_type: str, cfg: GateConfig) -> float:
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"""Apport requis = prix × taux (20 % résident RD, 30 % étranger)."""
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if residence_type not in cfg.taux_apport_pct:
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raise KeyError(
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f"residence_type {residence_type!r} inconnu "
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f"(attendu : {sorted(cfg.taux_apport_pct)})."
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)
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return round(float(prix_usd) * cfg.taux_apport_pct[residence_type] / 100.0, 2)
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def apport_verse_usd(dossier: dict) -> float:
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"""Somme des versements enregistrés (0 si aucun)."""
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total = 0.0
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for p in dossier.get("paiements", []):
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total += float(p.get("montant_verse_usd", 0) or 0)
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return round(total, 2)
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def required_document_ids(residence_type: str, cfg: GateConfig) -> list[str]:
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"""Documents `is_required` applicables au type de résidence du client.
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Un document est exigé si `is_required` ET (`applies_to` == "all" OU
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`applies_to` == residence_type). Les documents « étrangers uniquement » ne
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s'appliquent donc pas à un résident RD.
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"""
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out: list[str] = []
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for d in cfg.documents:
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if not d.get("is_required"):
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continue
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applies = d.get("applies_to", "all")
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if applies in ("all", residence_type):
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out.append(d["id"])
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return out
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def _cond_apport(dossier: dict, cfg: GateConfig) -> dict:
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residence = dossier.get("residence_type")
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required = apport_requis_usd(dossier.get("prix_usd", 0), residence, cfg)
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paid = apport_verse_usd(dossier)
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remaining = round(max(0.0, required - paid), 2)
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pct = _round1(min(100.0, (paid / required * 100.0) if required > 0 else 100.0))
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return {
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"ok": paid + 1e-9 >= required,
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"required": required,
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"paid": paid,
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"remaining": remaining,
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"percent": pct,
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}
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def _cond_documents(dossier: dict, cfg: GateConfig) -> dict:
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residence = dossier.get("residence_type")
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required_ids = required_document_ids(residence, cfg)
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by_id = {d["id"]: d for d in dossier.get("documents", [])}
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deposited = 0
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validated = 0
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for did in required_ids:
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statut = (by_id.get(did) or {}).get("statut", "Non déposé")
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if statut != "Non déposé":
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deposited += 1
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if statut in cfg.statuts_recevables:
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validated += 1
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total = len(required_ids)
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pct = _round1((validated / total * 100.0) if total > 0 else 100.0)
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return {
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"ok": validated == total,
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"total": total,
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"deposited": deposited,
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"validated": validated,
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"percent": pct,
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}
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def _cond_autorisations(dossier: dict, cfg: GateConfig) -> dict:
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required_ids = [a["id"] for a in cfg.autorisations]
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by_id = {a["id"]: a for a in dossier.get("autorisations", [])}
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signed = 0
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for aid in required_ids:
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if (by_id.get(aid) or {}).get("signature_date"):
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signed += 1
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total = len(required_ids)
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pct = _round1((signed / total * 100.0) if total > 0 else 100.0)
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return {"ok": signed == total, "total": total, "signed": signed, "percent": pct}
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def _cond_validation_wag(dossier: dict) -> dict:
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validated_by = dossier.get("wag_validated_by")
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ok = bool(validated_by)
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return {"ok": ok, "validated_by": validated_by, "percent": 100.0 if ok else 0.0}
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def gate_status(dossier: dict, cfg: GateConfig) -> dict:
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"""État complet du gate — forme consommée par le frontend (barres 0-100 %).
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Correspond au contrat de l'endpoint
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`GET /api/hypotheque/dossier/{id}/gate-status` (DIRECTIVE amendement).
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"""
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conditions = {
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"apport_initial_complet": _cond_apport(dossier, cfg),
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"documents_exiges": _cond_documents(dossier, cfg),
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"autorisations_signees": _cond_autorisations(dossier, cfg),
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"validation_wag": _cond_validation_wag(dossier),
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}
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can_submit = all(conditions[k]["ok"] for k in CONDITION_KEYS)
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completed = sum(1 for k in CONDITION_KEYS if conditions[k]["ok"])
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overall = _round1(
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sum(conditions[k]["percent"] for k in CONDITION_KEYS) / len(CONDITION_KEYS)
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)
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return {
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"can_submit": can_submit,
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"conditions_total": len(CONDITION_KEYS),
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"conditions_completed": completed,
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"overall_percent": overall,
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"conditions": conditions,
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}
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def can_submit_dossier(dossier: dict, cfg: GateConfig) -> tuple[bool, list[str]]:
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"""(peut_soumettre, raisons_de_blocage) — vide si soumissible.
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`submit_to_bank()` doit renvoyer 403 + ces raisons tant que la liste n'est
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pas vide. Ordre des raisons = ordre canonique des conditions.
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"""
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status = gate_status(dossier, cfg)
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reasons: list[str] = []
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c = status["conditions"]
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if not c["apport_initial_complet"]["ok"]:
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a = c["apport_initial_complet"]
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reasons.append(
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f"Apport initial incomplet : {a['paid']:.0f}/{a['required']:.0f} USD versés "
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f"(reste {a['remaining']:.0f} USD · {a['percent']}%)."
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)
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if not c["documents_exiges"]["ok"]:
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d = c["documents_exiges"]
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reasons.append(
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f"Documents exigés incomplets : {d['validated']}/{d['total']} validés WAG."
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)
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if not c["autorisations_signees"]["ok"]:
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s = c["autorisations_signees"]
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reasons.append(
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f"Autorisations non signées : {s['signed']}/{s['total']} signées."
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)
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if not c["validation_wag"]["ok"]:
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reasons.append("Validation WAG manquante (aucun conseiller référent n'a validé).")
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return status["can_submit"], reasons
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