"""
api/main.py — FastAPI application with lifespan, CORS, and health check
"""

import os
import tempfile
from contextlib import asynccontextmanager

from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware
from loguru import logger

from api.routes import ingest, draft, feedback, patterns, evidence


@asynccontextmanager
async def lifespan(app: FastAPI):
    """Startup and shutdown events."""
    logger.info("Legal Document Intelligence System starting...")
    # Import dependencies to trigger initialisation
    from api import dependencies  # noqa: F401
    logger.info("All components initialised.")
    yield
    logger.info("Shutting down.")


app = FastAPI(
    title="Legal Document Intelligence System",
    description=(
        "Production-grade AI pipeline for legal document ingestion, "
        "retrieval, grounded draft generation, and continuous improvement."
    ),
    version="1.0.0",
    lifespan=lifespan,
)

# CORS
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

# Routes
app.include_router(ingest.router, tags=["Ingestion"])
app.include_router(draft.router, tags=["Draft Generation"])
app.include_router(feedback.router, tags=["Feedback Loop"])
app.include_router(patterns.router, tags=["Patterns"])
app.include_router(evidence.router, tags=["Evidence"])


@app.get("/health")
async def health():
    from api.dependencies import vectorstore, bm25_index, pattern_store
    return {
        "status": "healthy",
        "components": {
            "vector_store_chunks": vectorstore.count(),
            "bm25_chunks": bm25_index.count(),
            "active_patterns": pattern_store.pattern_count(),
        },
    }