"""
eamco_auto_api - FastAPI Automatic Delivery Microservice.

This microservice provides endpoints for managing automatic oil delivery
scheduling, fuel level estimation, and delivery confirmation.

Endpoints:
    GET  /health                    - Health check with database connectivity status
    GET  /main/temp                 - Manually trigger temperature fetch
    GET  /main/update/auto          - Update fuel levels for auto-delivery customers
    GET  /main/update/normal        - Update fuel levels for normal customers
    GET  /delivery/...              - Delivery management endpoints
    POST /confirm/...               - Delivery confirmation endpoints
    GET  /fixstuff/auto/...         - Auto-delivery fix/maintenance endpoints
    GET  /fixstuff/customer/...     - Customer fix/maintenance endpoints

Usage:
    # Development
    uvicorn main:app --reload --host 0.0.0.0 --port 8000

    # Production (Docker)
    docker run -p 8000:8000 eamco_auto_api
"""

import logging
import sys
import uuid
import os

from fastapi import FastAPI, Request
from fastapi.middleware.cors import CORSMiddleware
from starlette.middleware.base import BaseHTTPMiddleware
from sqlalchemy import create_engine, text
from sqlalchemy.orm import sessionmaker

from config import load_config
from app.routers import main, delivery, confirm, fixstuff_auto, fixstuff_customer


# =============================================================================
# CONFIGURATION
# =============================================================================

ApplicationConfig = load_config()

# =============================================================================
# LOGGING CONFIGURATION
# =============================================================================


def setup_logging():
    """Configure structured logging for the application."""
    log_level = logging.DEBUG if ApplicationConfig.CURRENT_SETTINGS != 'PRODUCTION' else logging.INFO

    formatter = logging.Formatter(
        '%(asctime)s - %(name)s - %(levelname)s - %(message)s',
        datefmt='%Y-%m-%d %H:%M:%S'
    )

    root_logger = logging.getLogger()
    root_logger.setLevel(log_level)
    root_logger.handlers.clear()

    console_handler = logging.StreamHandler(sys.stdout)
    console_handler.setLevel(log_level)
    console_handler.setFormatter(formatter)
    root_logger.addHandler(console_handler)

    logging.getLogger('uvicorn.access').setLevel(logging.WARNING)

    return logging.getLogger('eamco_auto_api')


logger = setup_logging()

# =============================================================================
# DATABASE SETUP
# =============================================================================

engine = create_engine(
    ApplicationConfig.SQLALCHEMY_DATABASE_URI,
    pool_pre_ping=True,
    pool_size=5,
    max_overflow=10,
    pool_recycle=3600,
)
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)


def check_db_connection():
    """
    Test database connectivity.
    """
    try:
        db = SessionLocal()
        db.execute(text("SELECT 1"))
        db.close()
        return True
    except Exception:
        return False


# =============================================================================
# FASTAPI APPLICATION
# =============================================================================

app = FastAPI(
    title="eamco_auto_api",
    description="Automatic oil delivery scheduling and fuel estimation microservice",
    version="1.0.0",
    docs_url="/docs",
    redoc_url="/redoc",
)

# =============================================================================
# MIDDLEWARE
# =============================================================================


class RequestIDMiddleware(BaseHTTPMiddleware):
    """Request ID middleware for request tracking/correlation."""

    async def dispatch(self, request: Request, call_next):
        request_id = request.headers.get("X-Request-ID") or str(uuid.uuid4())[:8]
        request.state.request_id = request_id
        response = await call_next(request)
        response.headers["X-Request-ID"] = request_id
        return response


app.add_middleware(RequestIDMiddleware)

app.add_middleware(
    CORSMiddleware,
    allow_origins=ApplicationConfig.origins,
    allow_credentials=True,
    allow_methods=["GET", "POST", "PUT", "DELETE", "OPTIONS"],
    allow_headers=["Authorization", "Content-Type", "Accept", "Origin", "X-Requested-With"],
)

# =============================================================================
# ROUTERS
# =============================================================================

app.include_router(main.router)
app.include_router(delivery.router)
app.include_router(confirm.router)
app.include_router(fixstuff_auto.router)
app.include_router(fixstuff_customer.router)

# =============================================================================
# ENDPOINTS
# =============================================================================


@app.get("/", include_in_schema=False)
async def root():
    """Root endpoint - redirect to docs."""
    return {
        "service": "eamco_auto_api",
        "version": "1.0.0",
        "docs": "/docs",
    }


@app.get("/health", tags=["Health"])
async def health_check():
    """
    Health check endpoint.

    Returns service status and database connectivity.
    Use this endpoint for container health checks and monitoring.

    Returns:
        JSON with status and db_connected flag
    """
    db_connected = check_db_connection()

    return {
        "status": "healthy" if db_connected else "degraded",
        "db_connected": db_connected,
    }


# =============================================================================
# STARTUP/SHUTDOWN EVENTS
# =============================================================================


@app.on_event("startup")
async def startup_event():
    """Application startup - log configuration and test DB connection."""
    logger.info("🚀 eamco_auto_api STARTING")
    mode = ApplicationConfig.CURRENT_SETTINGS.upper()
    if mode in ['DEVELOPMENT', 'DEV']:
        logger.info("🤖🤖🤖🤖🤖 Mode: Development 🤖🤖🤖🤖🤖")
    elif mode in ['PRODUCTION', 'PROD']:
        logger.info("💀💀💀💀💀💀💀💀💀💀 ⚠️ WARNING PRODUCTION 💀💀💀💀💀💀💀💀💀💀")
    # Sanitize DB URI to avoid logging credentials
    db_uri = ApplicationConfig.SQLALCHEMY_DATABASE_URI
    if '@' in db_uri:
        db_uri = db_uri.split('@')[-1]  # Only show host/db portion
    logger.info(f"DB: ...@{db_uri[:50]}")
    logger.info(f"CORS: {len(ApplicationConfig.origins)} origins configured")

    # Test database connection
    if check_db_connection():
        logger.info("DB Connection: ✅ OK")
    else:
        logger.warning("DB Connection: ❌ FAILED")


@app.on_event("shutdown")
async def shutdown_event():
    """Application shutdown - cleanup."""
    logger.info("🛑 eamco_auto_api SHUTTING DOWN")