"""
api/dependencies.py — Shared singleton instances for the API layer

All heavy objects (embedder, vectorstore, reranker, pattern_store, etc.)
are initialised once here and used across all route handlers.
"""

from retrieval.embedder import Embedder
from retrieval.vectorstore import VectorStore
from retrieval.bm25_index import BM25Index
from retrieval.reranker import Reranker
from generation.drafter import Drafter
from generation.validator import CitationValidator
from feedback.pattern_store import PatternStore
from feedback.pipeline import FeedbackPipeline

# Singletons — initialised at module load (on first import)
embedder = Embedder()
vectorstore = VectorStore(embedder=embedder)
bm25_index = BM25Index()
reranker = Reranker()
drafter = Drafter()
validator = CitationValidator()
pattern_store = PatternStore()
feedback_pipeline = FeedbackPipeline(pattern_store=pattern_store)