"""FastAPI application entry point."""

import asyncio
from pathlib import Path

import logging

import structlog
from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import FileResponse
from fastapi.staticfiles import StaticFiles

from navi.api.routes import agents, auth, health, messages, sessions, webhooks
from navi.api.routes.admin import router as admin_router
from navi.api.websocket import router as ws_router
from navi.config import settings
from debug.eval.api import router as eval_router

structlog.configure(
    wrapper_class=structlog.make_filtering_bound_logger(
        getattr(logging, settings.log_level)
    ),
)

app = FastAPI(
    title="Navi",
    description="Modular agent system — REST API and WebSocket",
    version="0.1.0",
)

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

# Keep reference to background cleanup task so unhandled exceptions are not lost
_cleanup_task = None

app.include_router(health.router)
app.include_router(auth.router)
app.include_router(agents.router)
app.include_router(sessions.router)
app.include_router(messages.router)
app.include_router(ws_router)
app.include_router(webhooks.router)
app.include_router(admin_router)
app.include_router(eval_router)

_base = Path(__file__).parent.parent
app.mount("/assets", StaticFiles(directory=str(_base / "webclient" / "dist" / "assets")), name="assets")
app.mount("/images", StaticFiles(directory=str(_base / "webclient" / "dist" / "images")), name="images")
app.mount("/content-viewers", StaticFiles(directory=str(_base / "webclient" / "dist" / "content-viewers")), name="content_viewers")
app.mount("/content", StaticFiles(directory=str(_base / "navi" / "content")), name="content")


@app.on_event("startup")
async def _on_startup() -> None:
    from navi.api.deps import get_registries, get_session_store
    from navi.content_store import ensure_tables
    from navi.session_files import cleanup_loop
    from navi.auth import _ensure_auth_tables
    # Ensure content store and auth tables exist (retry for race with Docker compose)
    for attempt in range(1, 6):
        try:
            await ensure_tables()
            await _ensure_auth_tables()
            break
        except Exception as e:
            log = structlog.get_logger()
            if attempt < 5:
                log.warning("startup.ensure_tables_retry", attempt=attempt, error=str(e))
                await asyncio.sleep(2)
            else:
                log.error("startup.ensure_tables_failed", error=str(e))
    # Initialize registries before embed health check. The memory store gets its
    # embedding backend wired during registry construction.
    get_registries()
    # Check embedding backend health and log status
    from navi.api.routes.health import _check_embed

    embed_status = await _check_embed()
    log = structlog.get_logger()
    if embed_status["ok"]:
        log.info("startup.embed_ready", backend=embed_status["backend"])
    else:
        log.warning("startup.embed_unavailable", backend=embed_status["backend"], error=embed_status["error"])
    # Start session file cleanup background task
    global _cleanup_task
    _cleanup_task = asyncio.create_task(cleanup_loop(get_session_store()))


@app.on_event("shutdown")
async def _on_shutdown() -> None:
    from navi.tools.ssh_exec import close_all_connections

    close_all_connections()


@app.get("/", include_in_schema=False)
async def index() -> FileResponse:
    return FileResponse(str(_base / "webclient" / "dist" / "index.html"), headers={"Cache-Control": "no-store"})


@app.get("/debug", include_in_schema=False)
async def debug() -> FileResponse:
    return FileResponse("debug/index.html", headers={"Cache-Control": "no-store"})


@app.get("/debug/eval", include_in_schema=False)
async def debug_eval() -> FileResponse:
    return FileResponse("debug/eval/index.html", headers={"Cache-Control": "no-store"})