package port

import (
	"context"
	"net/http"
	"slices"

	"gitea.dwysokinski.me/twhelp/corev3/internal/domain"
	"gitea.dwysokinski.me/twhelp/corev3/internal/port/internal/apimodel"
	"github.com/go-chi/chi/v5"
)

func (h *apiHTTPHandler) ListServers(
	w http.ResponseWriter,
	r *http.Request,
	versionCode apimodel.VersionCodePathParam,
	params apimodel.ListServersParams,
) {
	domainParams := domain.NewListServersParams()

	if err := domainParams.SetSort([]domain.ServerSort{domain.ServerSortOpenDESC, domain.ServerSortKeyASC}); err != nil {
		apiErrorRenderer{errors: []error{err}, formatErrorPath: formatListServersParamsErrorPath}.render(w, r)
		return
	}

	if err := domainParams.SetVersionCodes([]string{versionCode}); err != nil {
		apiErrorRenderer{errors: []error{err}, formatErrorPath: formatListServersParamsErrorPath}.render(w, r)
		return
	}

	if params.Open != nil {
		if err := domainParams.SetOpen(domain.NullBool{
			Value: *params.Open,
			Valid: true,
		}); err != nil {
			apiErrorRenderer{errors: []error{err}, formatErrorPath: formatListServersParamsErrorPath}.render(w, r)
			return
		}
	}

	if params.Limit != nil {
		if err := domainParams.SetLimit(*params.Limit); err != nil {
			apiErrorRenderer{errors: []error{err}, formatErrorPath: formatListServersParamsErrorPath}.render(w, r)
			return
		}
	}

	if params.Cursor != nil {
		if err := domainParams.SetEncodedCursor(*params.Cursor); err != nil {
			apiErrorRenderer{errors: []error{err}, formatErrorPath: formatListServersParamsErrorPath}.render(w, r)
			return
		}
	}

	res, err := h.serverSvc.List(r.Context(), domainParams)
	if err != nil {
		apiErrorRenderer{errors: []error{err}}.render(w, r)
		return
	}

	renderJSON(w, r, http.StatusOK, apimodel.NewListServersResponse(res))
}

func (h *apiHTTPHandler) GetServer(
	w http.ResponseWriter,
	r *http.Request,
	_ apimodel.VersionCodePathParam,
	_ apimodel.ServerKeyPathParam,
) {
	server, _ := serverFromContext(r.Context())
	renderJSON(w, r, http.StatusOK, apimodel.NewGetServerResponse(server))
}

func (h *apiHTTPHandler) GetBuildingInfo(
	w http.ResponseWriter,
	r *http.Request,
	_ apimodel.VersionCodePathParam,
	_ apimodel.ServerKeyPathParam,
) {
	server, _ := serverFromContext(r.Context())
	renderJSON(w, r, http.StatusOK, apimodel.NewGetBuildingInfoResponse(server.BuildingInfo()))
}

func (h *apiHTTPHandler) GetServerConfig(
	w http.ResponseWriter,
	r *http.Request,
	_ apimodel.VersionCodePathParam,
	_ apimodel.ServerKeyPathParam,
) {
	server, _ := serverFromContext(r.Context())
	renderJSON(w, r, http.StatusOK, apimodel.NewGetServerConfigResponse(server.Config()))
}

func (h *apiHTTPHandler) GetUnitInfo(
	w http.ResponseWriter,
	r *http.Request,
	_ apimodel.VersionCodePathParam,
	_ apimodel.ServerKeyPathParam,
) {
	server, _ := serverFromContext(r.Context())
	renderJSON(w, r, http.StatusOK, apimodel.NewGetUnitInfoResponse(server.UnitInfo()))
}

func (h *apiHTTPHandler) serverMiddleware(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		ctx := r.Context()
		routeCtx := chi.RouteContext(ctx)
		version, versionOK := versionFromContext(ctx)
		serverKeyIdx := slices.Index(routeCtx.URLParams.Keys, "serverKey")

		if !versionOK || serverKeyIdx < 0 {
			next.ServeHTTP(w, r)
			return
		}

		server, err := h.serverSvc.GetNormalByVersionCodeAndServerKey(
			ctx,
			version.Code(),
			routeCtx.URLParams.Values[serverKeyIdx],
		)
		if err != nil {
			apiErrorRenderer{errors: []error{err}}.render(w, r)
			return
		}

		next.ServeHTTP(w, r.WithContext(serverToContext(ctx, server)))
	})
}

type serverCtxKey struct{}

func serverToContext(ctx context.Context, s domain.Server) context.Context {
	return context.WithValue(ctx, serverCtxKey{}, s)
}

func serverFromContext(ctx context.Context) (domain.Server, bool) {
	s, ok := ctx.Value(serverCtxKey{}).(domain.Server)
	return s, ok
}

func formatListServersParamsErrorPath(segments []errorPathSegment) []string {
	if segments[0].model != "ListServersParams" {
		return nil
	}

	switch segments[0].field {
	case "cursor":
		return []string{"$query", "cursor"}
	case "limit":
		return []string{"$query", "limit"}
	case "open":
		return []string{"$query", "open"}
	case "sort":
		return []string{"$query", "sort"}
	case "versionCodes":
		return []string{"$path", "versionCode"}
	default:
		return nil
	}
}