from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware
from starlette.responses import JSONResponse
import uvicorn

from storage.database import init_db
from exceptions import ServiceNotConfiguredError
from middleware.config_guard import ConfigGuardMiddleware
from api import debates_router, api_keys_router, models_router, setup_router

app = FastAPI(
    title="Dialectica - Multi-Model Debate Framework",
    description="A framework for structured debates between multiple language models",
    version="0.1.0"
)

# Add CORS middleware
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],  # Allow all origins for development
    allow_credentials=True,
    allow_methods=["*"],  # Allow all methods
    allow_headers=["*"],  # Allow all headers
    # Add exposed headers to allow frontend to access response headers
    expose_headers=["Access-Control-Allow-Origin", "Access-Control-Allow-Credentials"]
)

# Config guard: return 503 for business routes when DB not configured
app.add_middleware(ConfigGuardMiddleware)


@app.exception_handler(ServiceNotConfiguredError)
async def not_configured_handler(request, exc):
    return JSONResponse(
        status_code=503,
        content={"error_code": "SERVICE_NOT_CONFIGURED", "detail": str(exc)},
    )


@app.on_event("startup")
def startup_event():
    """Initialize database on startup (skipped if not configured)."""
    init_db()


# Register routers
app.include_router(debates_router)
app.include_router(api_keys_router)
app.include_router(models_router)
app.include_router(setup_router)


@app.get("/")
async def root():
    return {"message": "Welcome to Dialectica - Multi-Model Debate Framework"}


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