"""
MEXC Funding Rate Report - Backend API

FastAPI application for providing funding rate data and analysis.
"""
import os
from contextlib import asynccontextmanager
from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware
from apscheduler.schedulers.asyncio import AsyncIOScheduler

from app.config import get_settings
from app.database import Database
from app.api import (
    funding_rates_router, 
    stats_router, 
    alerts_router,
    watchlist_router,
    telegram_router,
)

# Initialize settings
settings = get_settings()

# Scheduler instance
scheduler = AsyncIOScheduler()


async def scheduled_data_refresh():
    """Refresh MEXC data every 5 minutes - ONLY source of MEXC API calls."""
    from app.services import get_mexc_client
    client = get_mexc_client()
    await client.refresh_data()


async def scheduled_fr_snapshot():
    """Record FR snapshot for watched coins (hourly)."""
    from app.services import get_history_service
    service = get_history_service()
    count = await service.record_fr_snapshot()
    if count > 0:
        print(f"Recorded FR snapshot for {count} watched coins")


async def scheduled_telegram_notify():
    """Send hourly Telegram notifications."""
    from app.services import get_telegram_service
    service = get_telegram_service()
    
    if service.is_configured():
        await service.send_top_fr_notification()
        await service.send_watchlist_notification()


@asynccontextmanager
async def lifespan(app: FastAPI):
    """Application lifespan manager."""
    # Startup
    await Database.connect()
    
    # Initial data fetch
    from app.services import get_mexc_client
    client = get_mexc_client()
    await client.refresh_data()
    
    # Setup Telegram bot with webhook
    from app.services.telegram_bot import TelegramBot
    webhook_url = os.environ.get("SPACE_HOST")
    if webhook_url:
        webhook_url = f"https://{webhook_url}"
    await TelegramBot.setup(webhook_base_url=webhook_url)
    
    # Setup scheduler
    scheduler.add_job(
        scheduled_data_refresh,
        'interval',
        minutes=5,
        id='data_refresh',
        replace_existing=True,
    )
    scheduler.add_job(
        scheduled_fr_snapshot,
        'interval',
        minutes=settings.fr_history_interval,
        id='fr_snapshot',
        replace_existing=True,
    )
    scheduler.add_job(
        scheduled_telegram_notify,
        'interval',
        minutes=settings.telegram_notify_interval,
        id='telegram_notify',
        replace_existing=True,
    )
    
    scheduler.start()
    print(f"Scheduler started: Data refresh every 5min, FR snapshot every {settings.fr_history_interval}min")
    
    yield
    
    # Shutdown
    scheduler.shutdown()
    await TelegramBot.shutdown()
    await Database.disconnect()


# Create FastAPI app
app = FastAPI(
    title="MEXC Funding Rate Report API",
    description="API for monitoring and analyzing MEXC Futures funding rates",
    version="2.0.0",
    docs_url="/docs",
    redoc_url="/redoc",
    lifespan=lifespan,
)

# Configure CORS
origins = settings.cors_origins.split(",")
app.add_middleware(
    CORSMiddleware,
    allow_origins=origins,
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

# Include routers
app.include_router(funding_rates_router, prefix="/api/v1")
app.include_router(stats_router, prefix="/api/v1")
app.include_router(alerts_router, prefix="/api/v1")
app.include_router(watchlist_router, prefix="/api/v1")
app.include_router(telegram_router, prefix="/api/v1")


@app.get("/")
async def root():
    """Health check endpoint."""
    from app.services import get_mexc_client
    client = get_mexc_client()
    cache_age = client.get_cache_age_seconds()
    
    return {
        "status": "ok",
        "message": "MEXC FR Report API is running",
        "version": "2.0.0",
        "cache_age_seconds": cache_age,
        "data_refresh": "every 5 minutes",
    }


@app.get("/health")
async def health():
    """Health check endpoint for monitoring."""
    from app.database import get_database
    from app.services import get_mexc_client
    
    db = get_database()
    client = get_mexc_client()
    
    return {
        "status": "healthy",
        "database": "connected" if db is not None else "disconnected",
        "mexc_cache_age": client.get_cache_age_seconds(),
        "mexc_tickers_count": len(client.get_cached_tickers()),
    }


if __name__ == "__main__":
    import uvicorn
    port = int(os.environ.get("PORT", 8000))
    uvicorn.run("app.main:app", host="0.0.0.0", port=port, reload=True)