from contextlib import asynccontextmanager

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

from app import __version__
from app.api.v1 import api_router
from app.api.v1 import health
from app.core.config import settings
from app.core.logging import configure_logging, get_logger
from app.middlewares.tenant import TenantHeaderMiddleware
from shared.exceptions import AppError
from shared.responses import ErrorDetail, ErrorResponse

configure_logging(settings.log_level)
logger = get_logger(__name__)


@asynccontextmanager
async def lifespan(app: FastAPI):
    logger.info("service_starting", extra={"service": settings.service_name})
    yield


def create_app() -> FastAPI:
    app = FastAPI(
        title="Experience Platform",
        version=__version__,
        description="Torbat Pages — Experience Platform (Phase 11.9 Consumer Integrations & Widgets)",
        lifespan=lifespan,
    )
    app.add_middleware(
        CORSMiddleware,
        allow_origins=settings.cors_origin_list,
        allow_origin_regex=r"https?://([a-z0-9-]+\.)*torbatyar\.ir",
        allow_credentials=False,
        allow_methods=["*"],
        allow_headers=["*"],
    )
    app.add_middleware(TenantHeaderMiddleware)

    @app.exception_handler(AppError)
    async def app_error_handler(request: Request, exc: AppError) -> JSONResponse:
        return JSONResponse(
            status_code=exc.status_code,
            content=ErrorResponse(
                error=ErrorDetail(
                    code=exc.error_code, message=exc.message, details=exc.details
                )
            ).model_dump(),
        )

    @app.exception_handler(Exception)
    async def unhandled_handler(request: Request, exc: Exception) -> JSONResponse:
        logger.error("unhandled_exception", extra={"error": str(exc)}, exc_info=exc)
        return JSONResponse(
            status_code=500,
            content=ErrorResponse(
                error=ErrorDetail(code="internal_error", message="خطای داخلی سرور")
            ).model_dump(),
        )

    app.include_router(health.router)
    app.include_router(api_router, prefix=settings.api_v1_prefix)
    return app


app = create_app()
