from fastapi import FastAPI, Request
from fastapi.exceptions import RequestValidationError
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import JSONResponse

from app.api.discovery import router as discovery_router
from app.api.evaluations import router as evaluations_router
from app.api.health import router as health_router
from app.api.offers import router as offers_router
from app.api.products import router as products_router
from app.api.profiles import router as profiles_router
from app.api.projects import router as projects_router
from app.errors import AppError, error_body
from app.settings import get_settings

settings = get_settings()
app = FastAPI(
    title="Buying Agent",
    version="0.1.0",
    description="Generic buying and deal evaluation API. The backend is the system of record; no frontend or n8n is required.",
)
app.add_middleware(
    CORSMiddleware,
    allow_origins=settings.cors_origins,
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)
app.include_router(health_router)
app.include_router(profiles_router)
app.include_router(products_router)
app.include_router(offers_router)
app.include_router(evaluations_router)
app.include_router(projects_router)
app.include_router(discovery_router)


@app.exception_handler(AppError)
def handle_app_error(_request: Request, exc: AppError) -> JSONResponse:
    return JSONResponse(error_body(exc.code, exc.message, exc.details), status_code=exc.status_code)


@app.exception_handler(RequestValidationError)
def handle_validation_error(_request: Request, exc: RequestValidationError) -> JSONResponse:
    return JSONResponse(
        error_body("VALIDATION_ERROR", "request validation failed", {"errors": exc.errors()}),
        status_code=422,
    )