"""StackPilot backend — FastAPI application entry point."""
from __future__ import annotations

import asyncio
import logging
from contextlib import asynccontextmanager

from fastapi import FastAPI, Request
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import JSONResponse
from sqlmodel import Session

from config import settings
from version import APP_VERSION
from database import engine, init_db
from docker_client import DockerError
from routers import (
    agents,
    audit,
    auth,
    backups,
    containers,
    dashboard,
    destinations,
    editor,
    files,
    images,
    networks,
    ports,
    schedules,
    secrets,
    settings as settings_router,
    stacks,
    system,
    templates,
    volumes,
    ws,
)
from services import (
    backup_destination_service,
    image_status_store,
    schedule_service,
    stack_lock_service,
    template_service,
    update_service,
)

logging.basicConfig(level=logging.INFO)
logger = logging.getLogger("stackpilot")


@asynccontextmanager
async def lifespan(app: FastAPI):
    init_db()
    # Register stacks that already exist on disk.
    try:
        with Session(engine) as session:
            stacks.sync_discovered_stacks(session)
    except Exception as exc:  # noqa: BLE001
        logger.warning("Stack discovery failed: %s", exc)
    # One-off: encrypt backup-destination credentials written before they were
    # stored encrypted (see services/crypto_service.py).
    try:
        with Session(engine) as session:
            encrypted = backup_destination_service.migrate_plaintext_configs(session)
        if encrypted:
            logger.info("Encrypted %d backup destination config(s) at rest", encrypted)
    except Exception as exc:  # noqa: BLE001
        logger.warning("Destination config encryption migration failed: %s", exc)
    try:
        moved = template_service.migrate_legacy_db_templates()
        if moved:
            logger.info("Migrated %d custom template(s) from the database to folders", moved)
    except Exception as exc:  # noqa: BLE001
        logger.warning("Legacy template migration failed: %s", exc)
    # Runtime state that used to live in module dicts and was lost on restart.
    try:
        with Session(engine) as session:
            stale = stack_lock_service.prune_expired(session)
        if stale:
            logger.info("Cleared %d stale stack lock(s) from a previous run", stale)
    except Exception as exc:  # noqa: BLE001
        logger.warning("Could not prune stack locks: %s", exc)
    try:
        restored = image_status_store.install()
        logger.info("Restored %d cached image update status(es)", restored)
    except Exception as exc:  # noqa: BLE001
        logger.warning("Could not restore the image update cache: %s", exc)

    update_task = asyncio.create_task(update_service.background_loop())
    schedule_task = asyncio.create_task(schedule_service.scheduler_loop())
    logger.info("StackPilot backend ready on port %s", settings.PORT)
    yield
    update_task.cancel()
    schedule_task.cancel()


app = FastAPI(title="StackPilot", version=APP_VERSION, lifespan=lifespan)

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


@app.exception_handler(DockerError)
async def docker_error_handler(_request: Request, exc: DockerError):
    return JSONResponse(
        status_code=502,
        content={"error": exc.error, "detail": exc.detail},
    )


app.include_router(auth.router)
app.include_router(stacks.router)
app.include_router(secrets.router)
app.include_router(containers.router)
app.include_router(dashboard.router)
app.include_router(system.router)
app.include_router(volumes.router)
app.include_router(editor.router)
app.include_router(files.router)
app.include_router(images.router)
app.include_router(ports.router)
app.include_router(templates.router)
app.include_router(audit.router)
app.include_router(settings_router.router)
app.include_router(backups.router)
app.include_router(destinations.router)
app.include_router(schedules.router)
app.include_router(networks.router)
app.include_router(agents.router)
app.include_router(ws.router)


@app.get("/api/health")
def health() -> dict:
    return {"status": "ok", "version": APP_VERSION}