from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware
from contextlib import asynccontextmanager
from database import engine, Base
from migrate import run_migrations
from routers import (
    clients, employees, payroll, invoices, 
    transactions, bank_accounts, revenues, expenses, auth, demo, personal_expenses
)

@asynccontextmanager
async def lifespan(app: FastAPI):
    # Create tables on startup
    Base.metadata.create_all(bind=engine)
    # Run migrations for existing DB tables
    run_migrations()
    # Run db engine migrations for starting_salary
    from migrate import run_db_migrations
    run_db_migrations(engine)
    yield
    # Cleanup on shutdown
    pass

app = FastAPI(
    title="Erha Technologies API",
    description="Backend API for Erha Technologies - Business Management System",
    version="1.0.0",
    lifespan=lifespan
)

from fastapi.responses import JSONResponse
import traceback

@app.exception_handler(Exception)
async def global_exception_handler(request, exc):
    tb = "".join(traceback.format_exception(type(exc), exc, exc.__traceback__))
    return JSONResponse(
        status_code=500,
        content={
            "error": str(exc),
            "traceback": tb
        }
    )

# CORS configuration
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],  # In production, specify exact origins
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

# Include routers
app.include_router(auth.router, prefix="/api/auth", tags=["Authentication"])
app.include_router(demo.router, prefix="/api/demo", tags=["Demo Data Seeding"])
app.include_router(clients.router, prefix="/api/clients", tags=["Clients"])
app.include_router(employees.router, prefix="/api/employees", tags=["Employees"])
app.include_router(payroll.router, prefix="/api/payroll", tags=["Payroll"])
app.include_router(invoices.router, prefix="/api/invoices", tags=["Invoices"])
app.include_router(transactions.router, prefix="/api/transactions", tags=["Transactions"])
app.include_router(bank_accounts.router, prefix="/api/bank-accounts", tags=["Bank Accounts"])
app.include_router(revenues.router, prefix="/api/revenues", tags=["Revenues"])
app.include_router(expenses.router, prefix="/api/expenses", tags=["Expenses"])
app.include_router(personal_expenses.router, prefix="/api/personal-expenses", tags=["Personal Expenses"])

@app.api_route("/", methods=["GET", "HEAD"])
async def root():
    return {
        "message": "Erha Technologies API",
        "version": "1.0.0",
        "status": "running"
    }

@app.api_route("/health", methods=["GET", "HEAD"])
async def health_check():
    return {"status": "healthy"}

if __name__ == "__main__":
    import uvicorn
    uvicorn.run(app, host="0.0.0.0", port=8000)