import asyncio
import logging
from contextlib import asynccontextmanager

from fastapi import FastAPI, Request, status
from fastapi.responses import FileResponse, JSONResponse
from fastapi.staticfiles import StaticFiles

from app.logging_config import setup_logging

setup_logging()

import app.bets.confirmation  # noqa: F401  (registers the "bet" confirmation handler)
import app.rounds.confirmation  # noqa: F401  (registers the "payout" confirmation handler)
import app.withdrawals.confirmation  # noqa: F401  (registers the "withdrawal" confirmation handler)
from app.api.routes.admin import router as admin_router
from app.api.routes.bets import router as bets_router
from app.api.routes.qr import router as qr_router
from app.api.routes.rounds import router as rounds_router
from app.api.routes.users import router as users_router
from app.api.routes.withdrawals import router as withdrawals_router
from app.auth.routes import router as auth_router
from app.api.errors import ApiError
from app.config import settings, validate_runtime_secrets
from app.db.base import AsyncSessionLocal
from app.deposits.reconcile import DepositReconciler
from app.electrum.client import ElectrumClient, ElectrumEndpoint, parse_endpoints
from app.electrum.listener import ElectrumListener
from app.rounds.scheduler import RoundScheduler
from app.tx.broadcast import RbfBumper
from app.tx.confirmation import ConfirmationPoller
from app.tx.locks import UserLocks
from app.tx.reconcile import PendingTransactionReconciler

logger = logging.getLogger(__name__)


def _make_electrum_client(endpoint: ElectrumEndpoint) -> ElectrumClient:
    return ElectrumClient(endpoint.host, endpoint.port, endpoint.use_ssl)


@asynccontextmanager
async def lifespan(app: FastAPI):
    # Refuses to serve rather than starting up half-configured (B-15).
    validate_runtime_secrets()

    endpoints = parse_endpoints(
        settings.electrum_host,
        settings.electrum_port,
        settings.electrum_use_ssl,
        settings.electrum_fallback_servers,
    )
    logger.info("Electrum endpoints (in rotation order): %s", ", ".join(str(e) for e in endpoints))

    listener = ElectrumListener(_make_electrum_client, AsyncSessionLocal, endpoints)
    app.state.electrum_listener = listener
    app.state.user_locks = UserLocks()

    scheduler = RoundScheduler(AsyncSessionLocal, listener)
    poller = ConfirmationPoller(AsyncSessionLocal, lambda: listener.client)
    bumper = RbfBumper(AsyncSessionLocal, lambda: listener.client)
    # Resolves in-flight transactions against the chain — the piece that lets the
    # system recover on its own from a broadcast that never confirmed (B-04/B-08).
    reconciler = PendingTransactionReconciler(AsyncSessionLocal, lambda: listener.client)
    # Periodic safety net for deposit crediting/external-spend detection,
    # independent of scripthash-change notifications — catches a subscription
    # silently lost on an otherwise healthy connection (B-30).
    deposit_reconciler = DepositReconciler(AsyncSessionLocal, listener)

    tasks = [
        asyncio.create_task(listener.run()),
        asyncio.create_task(scheduler.run()),
        asyncio.create_task(poller.run()),
        asyncio.create_task(bumper.run()),
        asyncio.create_task(reconciler.run()),
        asyncio.create_task(deposit_reconciler.run()),
    ]
    try:
        yield
    finally:
        for task in tasks:
            task.cancel()
        if listener.client is not None:
            await listener.client.close()


# Swagger/ReDoc/the raw OpenAPI JSON enumerate the entire API surface, admin
# endpoints included, to anyone who requests them (B-42) — disabled unless
# ENABLE_API_DOCS is explicitly set, which should only happen in development.
app = FastAPI(
    title="PLM Lottery",
    lifespan=lifespan,
    docs_url="/docs" if settings.enable_api_docs else None,
    redoc_url="/redoc" if settings.enable_api_docs else None,
    openapi_url="/openapi.json" if settings.enable_api_docs else None,
)
app.include_router(auth_router)
app.include_router(users_router)
app.include_router(bets_router)
app.include_router(withdrawals_router)
app.include_router(admin_router)
app.include_router(qr_router)
app.include_router(rounds_router)


@app.exception_handler(Exception)
async def log_unhandled_exception(request: Request, exc: Exception) -> JSONResponse:
    """Answers with the same structured `detail` shape as every deliberate failure
    (app/api/errors.py) so clients never have to special-case unexpected errors.
    The exception itself stays in logs/app.log only — never in the response body."""
    logger.exception("Unhandled error on %s %s", request.method, request.url.path)
    return JSONResponse(
        status_code=500,
        content={"detail": ApiError("internal_error", "internal server error").as_detail()},
    )


@app.get("/health")
async def health() -> dict[str, str]:
    return {"status": "ok"}


_NO_STORE_HEADERS = {"Cache-Control": "no-store"}


@app.get("/", include_in_schema=False)
async def index_page() -> FileResponse:
    return FileResponse("app/static/index.html", headers=_NO_STORE_HEADERS)


@app.get("/admin", include_in_schema=False)
async def admin_panel() -> FileResponse:
    return FileResponse("app/static/admin.html", headers=_NO_STORE_HEADERS)


@app.get("/guida", include_in_schema=False)
async def user_guide() -> FileResponse:
    return FileResponse("app/static/guida.html", headers=_NO_STORE_HEADERS)


@app.get("/report-bug", include_in_schema=False)
async def report_bug_page() -> FileResponse:
    return FileResponse("app/static/report-bug.html", headers=_NO_STORE_HEADERS)


app.mount("/", StaticFiles(directory="app/static", html=True), name="static")