403 lines
13 KiB
Python
403 lines
13 KiB
Python
"""Point d'entrée FastAPI du Brain LoreMind.
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Controller volontairement FIN : il valide l'entrée (DTOs Pydantic), délègue
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au domaine via injection de dépendance (ports + use cases), et transforme les
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erreurs du domaine en réponses HTTP. Aucune connaissance d'Ollama ici.
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"""
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import json
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from typing import Annotated, AsyncIterator
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from fastapi import Depends, FastAPI, HTTPException
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from fastapi.responses import StreamingResponse
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from pydantic import BaseModel, Field
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from app.application.chat import ChatUseCase
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from app.application.generate_page import GeneratePageUseCase
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from app.core.config import Settings, get_settings
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from app.domain.models import (
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ArcSummary,
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CampaignStructuralContext,
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ChapterSummary,
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ChatMessage,
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LoreStructuralContext,
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NarrativeEntityContext,
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PageContext,
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PageGenerationContext,
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PageSummary,
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SceneBranchHint,
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SceneSummary,
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)
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from app.domain.ports import LLMProvider, LLMProviderError
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from app.infrastructure.ollama_adapter import OllamaLLMProvider
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app = FastAPI(
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title="LoreMind Brain",
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description="Backend IA pour la génération de contenu narratif.",
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version="0.1.0",
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)
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# --- DTOs HTTP (frontière, c'est ici et seulement ici qu'on utilise Pydantic) ---
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class GenerateRequest(BaseModel):
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prompt: str
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class GenerateResponse(BaseModel):
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model: str
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response: str
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class GeneratePageRequestDTO(BaseModel):
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"""Contexte envoyé par le Core Java pour remplir une page via le LLM."""
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lore_name: str
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folder_name: str
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template_name: str
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template_fields: list[str] = Field(min_length=1)
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page_title: str
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lore_description: str | None = None
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class GeneratePageResponseDTO(BaseModel):
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"""Retour : une valeur textuelle par champ du template (clé = field name)."""
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values: dict[str, str]
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class ChatMessageDTO(BaseModel):
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"""Un message de la conversation. Rôles acceptés : user, assistant, system."""
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role: str = Field(pattern="^(user|assistant|system)$")
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content: str
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class PageSummaryDTO(BaseModel):
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"""Résumé enrichi d'une page : identité + contenu + interconnexions.
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Depuis b9 : values/tags/related_page_titles sont optionnels côté JSON —
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le Core Java ne les sérialise que s'ils sont non-vides (payload léger
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pour un Lore avec beaucoup de pages vierges).
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"""
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title: str
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template_name: str
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values: dict[str, str] = Field(default_factory=dict)
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tags: list[str] = Field(default_factory=list)
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related_page_titles: list[str] = Field(default_factory=list)
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class LoreContextDTO(BaseModel):
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"""Carte structurelle du Lore avec contenu des pages (b9+)."""
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lore_name: str
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lore_description: str | None = None
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folders: dict[str, list[PageSummaryDTO]] = Field(default_factory=dict)
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tags: list[str] = Field(default_factory=list)
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class PageContextDTO(BaseModel):
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"""Contexte d'une page spécifique pour focaliser le chat (optionnel)."""
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title: str
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template_name: str
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template_fields: list[str] = Field(default_factory=list)
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values: dict[str, str] = Field(default_factory=dict)
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class SceneBranchHintDTO(BaseModel):
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"""Indice d'une branche narrative (le Core a deja resolu le nom cible)."""
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label: str
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target_scene_name: str
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condition: str | None = None
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class SceneSummaryDTO(BaseModel):
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"""Résumé d'une scène : nom + description courte (synopsis)."""
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name: str
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description: str | None = None
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# Optionnel : le Core Java ne serialise illustration_count QUE si > 0
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# (payload plus leger). Defaut 0 = pas d'illustrations ou champ absent.
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illustration_count: int = 0
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# Branches narratives sortantes, omises cote Core si vides.
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branches: list[SceneBranchHintDTO] = Field(default_factory=list)
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class ChapterSummaryDTO(BaseModel):
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"""Résumé d'un chapitre : nom + description courte + ses scènes."""
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name: str
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description: str | None = None
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scenes: list[SceneSummaryDTO] = Field(default_factory=list)
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illustration_count: int = 0
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class ArcSummaryDTO(BaseModel):
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"""Résumé d'un arc narratif : nom + description courte + ses chapitres."""
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name: str
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description: str | None = None
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chapters: list[ChapterSummaryDTO] = Field(default_factory=list)
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illustration_count: int = 0
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class CampaignContextDTO(BaseModel):
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"""Carte narrative enrichie : arcs → chapitres → scènes avec synopsis."""
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campaign_name: str
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campaign_description: str | None = None
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arcs: list[ArcSummaryDTO] = Field(default_factory=list)
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class NarrativeEntityDTO(BaseModel):
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"""Entité narrative (arc/chapter/scene) en cours d'édition — focus optionnel."""
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entity_type: str = Field(pattern="^(arc|chapter|scene)$")
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title: str
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fields: dict[str, str] = Field(default_factory=dict)
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class ChatStreamRequestDTO(BaseModel):
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"""Requête de chat streamé : historique + contextes structurels.
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Les 4 contextes (lore, page, campaign, narrative_entity) sont optionnels,
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mais au moins l'un des deux "niveaux haut" (lore_context ou
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campaign_context) doit être fourni. Le validateur `check_scope` applique
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cette règle à la frontière HTTP.
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"""
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messages: list[ChatMessageDTO] = Field(min_length=1)
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lore_context: LoreContextDTO | None = None
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page_context: PageContextDTO | None = None
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campaign_context: CampaignContextDTO | None = None
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narrative_entity: NarrativeEntityDTO | None = None
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def has_scope(self) -> bool:
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"""Vrai si au moins un contexte racine (Lore ou Campagne) est fourni."""
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return self.lore_context is not None or self.campaign_context is not None
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# --- Factories d'injection de dépendance ---
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def get_llm_provider(
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settings: Annotated[Settings, Depends(get_settings)],
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) -> LLMProvider:
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"""Factory d'adapter — point d'inversion de dépendance.
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C'est ici (et uniquement ici) qu'on choisit QUEL adapter concret
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incarne le port. Pour swap vers un autre fournisseur, on change
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cette ligne et rien d'autre.
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"""
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return OllamaLLMProvider(settings)
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def get_generate_page_use_case(
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llm: Annotated[LLMProvider, Depends(get_llm_provider)],
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) -> GeneratePageUseCase:
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"""Factory du use case — injecte le port LLMProvider sans connaître l'adapter."""
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return GeneratePageUseCase(llm=llm)
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def get_chat_use_case(
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llm: Annotated[LLMProvider, Depends(get_llm_provider)],
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) -> ChatUseCase:
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"""Factory du use case chat.
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L'adapter OllamaLLMProvider satisfait les deux protocoles (LLMProvider
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et LLMChatProvider) par duck typing ; on lui passe la même instance.
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"""
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return ChatUseCase(llm=llm) # type: ignore[arg-type]
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# --- Endpoints ---
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@app.get("/health")
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def health() -> dict[str, str]:
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"""Sonde de santé — permet au Core Java de vérifier que le Brain répond."""
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return {"status": "ok", "service": "brain"}
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@app.post("/generate", response_model=GenerateResponse)
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async def generate(
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body: GenerateRequest,
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settings: Annotated[Settings, Depends(get_settings)],
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llm: Annotated[LLMProvider, Depends(get_llm_provider)],
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) -> GenerateResponse:
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"""Endpoint libre : prompt → texte brut. Utile pour debug et exploration."""
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try:
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text = await llm.generate(body.prompt)
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except LLMProviderError as exc:
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raise HTTPException(status_code=502, detail=str(exc)) from exc
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return GenerateResponse(model=settings.llm_model, response=text)
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@app.post("/generate-page", response_model=GeneratePageResponseDTO)
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async def generate_page(
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body: GeneratePageRequestDTO,
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use_case: Annotated[
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GeneratePageUseCase, Depends(get_generate_page_use_case)
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],
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) -> GeneratePageResponseDTO:
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"""Endpoint métier : contexte LoreMind → valeurs structurées par champ.
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Branche tout le use case `GeneratePageUseCase`. Ce controller ne fait
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que le mapping DTO ↔ dataclass et la traduction d'erreur domaine → HTTP.
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"""
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context = PageGenerationContext(
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lore_name=body.lore_name,
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lore_description=body.lore_description,
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folder_name=body.folder_name,
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template_name=body.template_name,
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template_fields=body.template_fields,
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page_title=body.page_title,
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)
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try:
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result = await use_case.execute(context)
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except LLMProviderError as exc:
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raise HTTPException(status_code=502, detail=str(exc)) from exc
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return GeneratePageResponseDTO(values=result.values)
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@app.post("/chat/stream")
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async def chat_stream(
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body: ChatStreamRequestDTO,
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use_case: Annotated[ChatUseCase, Depends(get_chat_use_case)],
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) -> StreamingResponse:
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"""Chat streamé (Server-Sent Events) avec Structural Context.
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Accepte jusqu'à 4 contextes optionnels (Lore, Page focalisée, Campagne,
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entité narrative focalisée). Au moins un contexte racine (Lore ou
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Campagne) est requis pour que la requête ait du sens.
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Format de flux :
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- Chaque token : `data: {"token": "..."}\\n\\n`
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- Fin normale : `event: done\\ndata: {}\\n\\n`
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- Erreur LLM : `event: error\\ndata: {"message": "..."}\\n\\n`
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"""
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if not body.has_scope():
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raise HTTPException(
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status_code=422,
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detail="Au moins un des deux contextes racines (lore_context ou campaign_context) est requis.",
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)
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messages = [ChatMessage(role=m.role, content=m.content) for m in body.messages]
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lore_context = _to_lore_context(body.lore_context)
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page_context = _to_page_context(body.page_context)
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campaign_context = _to_campaign_context(body.campaign_context)
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narrative_entity = _to_narrative_entity(body.narrative_entity)
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async def event_stream() -> AsyncIterator[str]:
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try:
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async for token in use_case.stream(
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messages,
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lore_context=lore_context,
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page_context=page_context,
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campaign_context=campaign_context,
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narrative_entity=narrative_entity,
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):
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# json.dumps avec ensure_ascii=False pour préserver les accents
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yield f"data: {json.dumps({'token': token}, ensure_ascii=False)}\n\n"
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yield "event: done\ndata: {}\n\n"
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except LLMProviderError as exc:
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yield f"event: error\ndata: {json.dumps({'message': str(exc)})}\n\n"
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return StreamingResponse(event_stream(), media_type="text/event-stream")
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# --- Mapping DTO → domaine (frontière HTTP) ---------------------------------
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def _to_lore_context(dto: LoreContextDTO | None) -> LoreStructuralContext | None:
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if dto is None:
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return None
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return LoreStructuralContext(
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lore_name=dto.lore_name,
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lore_description=dto.lore_description,
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folders={
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folder: [_to_page_summary(p) for p in pages]
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for folder, pages in dto.folders.items()
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},
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tags=dto.tags,
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)
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def _to_page_summary(dto: PageSummaryDTO) -> PageSummary:
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return PageSummary(
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title=dto.title,
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template_name=dto.template_name,
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values=dict(dto.values),
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tags=list(dto.tags),
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related_page_titles=list(dto.related_page_titles),
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)
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def _to_page_context(dto: PageContextDTO | None) -> PageContext | None:
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if dto is None:
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return None
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return PageContext(
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title=dto.title,
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template_name=dto.template_name,
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template_fields=dto.template_fields,
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values=dto.values,
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)
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def _to_campaign_context(dto: CampaignContextDTO | None) -> CampaignStructuralContext | None:
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if dto is None:
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return None
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arcs = [
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ArcSummary(
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name=arc.name,
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description=arc.description,
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illustration_count=arc.illustration_count,
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chapters=[
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ChapterSummary(
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name=ch.name,
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description=ch.description,
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illustration_count=ch.illustration_count,
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scenes=[
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SceneSummary(
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name=sc.name,
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description=sc.description,
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illustration_count=sc.illustration_count,
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branches=[
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SceneBranchHint(
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label=br.label,
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target_scene_name=br.target_scene_name,
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condition=br.condition,
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)
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for br in sc.branches
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],
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)
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for sc in ch.scenes
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],
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)
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for ch in arc.chapters
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],
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)
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for arc in dto.arcs
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]
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return CampaignStructuralContext(
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campaign_name=dto.campaign_name,
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campaign_description=dto.campaign_description,
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arcs=arcs,
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)
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def _to_narrative_entity(dto: NarrativeEntityDTO | None) -> NarrativeEntityContext | None:
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if dto is None:
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return None
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return NarrativeEntityContext(
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entity_type=dto.entity_type,
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title=dto.title,
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fields=dict(dto.fields),
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)
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