package port

import (
	"net/http"
	"sync"

	"gitea.dwysokinski.me/twhelp/corev3/internal/port/internal/apimodel"
	"gitea.dwysokinski.me/twhelp/corev3/internal/port/internal/swgui"
	"github.com/getkin/kin-openapi/openapi3"
	"github.com/go-chi/chi/v5"
	"github.com/go-chi/render"
)

type apiHTTPHandler struct {
	apimodel.Unimplemented
	getOpenAPISchema func() (*openapi3.T, error)
}

func WithOpenAPIConfig(oapiCfg OpenAPIConfig) APIHTTPHandlerOption {
	return func(cfg *apiHTTPHandlerConfig) {
		cfg.openAPI = oapiCfg
	}
}

func NewAPIHTTPHandler(opts ...APIHTTPHandlerOption) http.Handler {
	cfg := newAPIHTTPHandlerConfig(opts...)

	h := &apiHTTPHandler{
		getOpenAPISchema: sync.OnceValues(func() (*openapi3.T, error) {
			return getOpenAPISchema(cfg.openAPI)
		}),
	}

	r := chi.NewRouter()

	if cfg.openAPI.Enabled {
		r.Group(func(r chi.Router) {
			if cfg.openAPI.SwaggerEnabled {
				r.Handle("/v2/swagger/*", swgui.Handler(
					cfg.openAPI.BasePath+"/v2/swagger",
					cfg.openAPI.BasePath+"/v2/openapi3.json",
				))
			}
			r.Get("/v2/openapi3.json", h.sendOpenAPIJSON)
		})
	}

	return apimodel.HandlerWithOptions(h, apimodel.ChiServerOptions{BaseRouter: r})
}

func (h *apiHTTPHandler) renderJSON(w http.ResponseWriter, r *http.Request, status int, body any) {
	render.Status(r, status)
	render.JSON(w, r, body)
}