package app

import (
	"net"
	"net/http"

	"forge.cadoles.com/arcad/edge/pkg/app"
	"github.com/go-chi/chi/v5"
	"github.com/pkg/errors"
	"gitlab.com/wpetit/goweb/api"
	"gitlab.com/wpetit/goweb/logger"
)

type MountFunc func(r chi.Router)

type Handler struct {
	repo Repository
}

func (h *Handler) serveApps(w http.ResponseWriter, r *http.Request) {
	manifests, err := h.repo.List(r.Context())
	if err != nil {
		logger.Error(r.Context(), "could not retrieve app manifest", logger.CapturedE(errors.WithStack(err)))
		api.ErrorResponse(w, http.StatusInternalServerError, api.ErrCodeUnknownError, nil)

		return
	}

	api.DataResponse(w, http.StatusOK, struct {
		Manifests []*app.Manifest `json:"manifests"`
	}{
		Manifests: manifests,
	})
}

func (h *Handler) serveApp(w http.ResponseWriter, r *http.Request) {
	appID := app.ID(chi.URLParam(r, "appID"))

	manifest, err := h.repo.Get(r.Context(), appID)
	if err != nil {
		if errors.Is(err, ErrNotFound) {
			api.ErrorResponse(w, http.StatusNotFound, api.ErrCodeNotFound, nil)

			return
		}

		logger.Error(r.Context(), "could not retrieve app manifest", logger.CapturedE(errors.WithStack(err)))
		api.ErrorResponse(w, http.StatusInternalServerError, api.ErrCodeUnknownError, nil)

		return
	}

	api.DataResponse(w, http.StatusOK, struct {
		Manifest *app.Manifest `json:"manifest"`
	}{
		Manifest: manifest,
	})
}

type serveAppURLRequest struct {
	From string `json:"from,omitempty"`
}

func (h *Handler) serveAppURL(w http.ResponseWriter, r *http.Request) {
	ctx := r.Context()

	req := &serveAppURLRequest{}
	if ok := api.Bind(w, r, req); !ok {
		return
	}

	appID := app.ID(chi.URLParam(r, "appID"))

	from := req.From
	if from == "" {
		from = retrieveRemoteAddr(r)
	}

	url, err := h.repo.GetURL(ctx, appID, from)
	if err != nil {
		if errors.Is(err, ErrNotFound) {
			api.ErrorResponse(w, http.StatusNotFound, api.ErrCodeNotFound, nil)

			return
		}

		logger.Error(r.Context(), "could not retrieve app url", logger.CapturedE(errors.WithStack(err)))
		api.ErrorResponse(w, http.StatusInternalServerError, api.ErrCodeUnknownError, nil)

		return
	}

	api.DataResponse(w, http.StatusOK, struct {
		URL string `json:"url"`
	}{
		URL: url,
	})
}

func Mount(repository Repository) MountFunc {
	handler := &Handler{repository}
	return func(r chi.Router) {
		r.Get("/api/v1/apps", handler.serveApps)
		r.Get("/api/v1/apps/{appID}", handler.serveApp)
		r.Post("/api/v1/apps/{appID}/url", handler.serveAppURL)
	}
}

func retrieveRemoteAddr(r *http.Request) string {
	host, _, err := net.SplitHostPort(r.RemoteAddr)
	if err != nil {
		host = r.RemoteAddr
	}

	return host
}