"""
Mulita - Photo Management Application
Main FastAPI application entry point
"""
from contextlib import asynccontextmanager
from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware
from fastapi.staticfiles import StaticFiles
from starlette.middleware.sessions import SessionMiddleware
import logging
import os

from app.config import settings
from app.database import init_db
from app.routers import photos, folders, heaps, tags, discard, library, search, auth, admin, sharing, download, nextcloud, nc_webhook
from app.services.scanner import start_initial_scan, bootstrap_default_source_root
from app.services.cleanup import cleanup_data_integrity
from app.services.nextcloud_dav import init_preview_client, close_preview_client

# Configure logging
logging.basicConfig(
    level=logging.INFO,
    format='%(asctime)s - %(name)s - %(levelname)s - %(message)s'
)
logger = logging.getLogger(__name__)

@asynccontextmanager
async def lifespan(app: FastAPI):
    """Manage application lifecycle"""
    logger.info("Starting Mulita application...")

    # Initialize database
    await init_db()

    # Pooled httpx client to Nextcloud — keepalive + HTTP/2 means every
    # thumbnail / Memories-info call after the first reuses one socket
    # instead of paying TCP+TLS handshake per request.
    await init_preview_client()

    # First-boot convenience: if there are no source roots in the DB yet,
    # create one for the default /photos mount so the user sees their
    # library immediately without configuring anything in the UI.
    try:
        await bootstrap_default_source_root()
    except Exception as e:
        logger.error(f"Bootstrap source root failed (continuing): {e}")

    # One-shot cleanup of duplicate source_roots / folders left over from
    # earlier scanner versions that didn't normalize paths. Idempotent.
    try:
        await cleanup_data_integrity()
    except Exception as e:
        logger.error(f"Startup cleanup failed (continuing): {e}")

    # Start initial scan if configured
    if settings.scanner.initial_scan_on_start:
        logger.info("Starting initial library scan...")
        await start_initial_scan()

    yield

    logger.info("Shutting down Mulita application...")
    await close_preview_client()

# Create FastAPI app
app = FastAPI(
    title="Mulita Photo Management API",
    description="Self-hosted photo management application inspired by Lightroom",
    version="1.0.0",
    lifespan=lifespan
)

# Configure CORS. The frontend normally talks to the backend through the
# nginx (prod) or vite (dev) proxy, so requests are same-origin and never
# trip CORS. ALLOWED_ORIGINS in .env controls the fallback for direct
# browser access from other origins (LAN IP, reverse proxy under a
# different host). Defaults to "*" since this is a single-user homelab
# tool; lock it down by setting e.g. ALLOWED_ORIGINS=https://photos.your.tld
# in production deployments.
_origins = settings.cors_origins
app.add_middleware(
    CORSMiddleware,
    allow_origins=_origins,
    # Wildcard origins can't be combined with credentials per the CORS
    # spec, so credentials get auto-disabled in that case.
    allow_credentials=_origins != ["*"],
    allow_methods=["*"],
    allow_headers=["*"],
)

# Session middleware — only used by Authlib to hold PKCE state during
# the OIDC round-trip. max_age is short because the cookie is only
# meaningful between /auth/oidc/login and /auth/oidc/callback; the app
# itself still runs on JWTs.
app.add_middleware(
    SessionMiddleware,
    secret_key=settings.effective_session_secret,
    session_cookie="mulita_oidc",
    max_age=600,
    same_site="lax",
    https_only=False,
)

# Mount static files for serving thumbnails (with X-Accel-Redirect support)
if os.path.exists("/data/thumbs"):
    app.mount("/thumbs", StaticFiles(directory="/data/thumbs"), name="thumbs")

# Include routers
app.include_router(auth.router, prefix="/api/v1/auth", tags=["auth"])
app.include_router(admin.router, prefix="/api/v1/admin", tags=["admin"])
app.include_router(sharing.router, prefix="/api/v1", tags=["sharing"])
app.include_router(photos.router, prefix="/api/v1/photos", tags=["photos"])
app.include_router(folders.router, prefix="/api/v1/folders", tags=["folders"])
app.include_router(heaps.router, prefix="/api/v1/heaps", tags=["heaps"])
app.include_router(tags.router, prefix="/api/v1/tags", tags=["tags"])
app.include_router(discard.router, prefix="/api/v1/discard", tags=["discard"])
app.include_router(library.router, prefix="/api/v1/library", tags=["library"])
app.include_router(search.router, prefix="/api/v1/photos/search", tags=["search"])
app.include_router(download.router, prefix="/api/v1/download", tags=["download"])
app.include_router(nextcloud.router, prefix="/api/v1/nextcloud", tags=["nextcloud"])
app.include_router(nc_webhook.router, prefix="/api/v1/internal", tags=["nc-webhook"])

@app.get("/")
async def root():
    """Root endpoint"""
    return {
        "name": "Mulita Photo Management API",
        "version": "1.0.0",
        "status": "running"
    }

@app.get("/health")
async def health_check():
    """Health check endpoint for Docker"""
    return {"status": "healthy"}